Separate Radio Frequency Research Articles

Hybrid Beamforming in Massive MIMO for Next-Generation Communication Technology.

Hybrid beamforming is a viable method for lowering the complexity and expense of massive multiple-input multiple-output systems while achieving high data rates on track with digital beamforming. To this end, the purpose of the research reported in this paper is to assess the effectiveness of the three architectural beamforming techniques (Analog, Digital, and Hybrid beamforming) in massive multiple-input multiple-output systems, especially hybrid beamforming. In hybrid beamforming, the antennas are connected to a single radio frequency chain, unlike digital beamforming, where each antenna has a separate radio frequency chain. The beam formation toward a particular angle depends on the channel state information. Further, massive multiple-input multiple-output is discussed in detail along with the performance parameters like bit error rate, signal-to-noise ratio, achievable sum rate, power consumption in massive multiple-input multiple-output, and energy efficiency. Finally, a comparison has been established between the three beamforming techniques.

OTFS-Based Joint Communication and Sensing for Future Industrial IoT

Effective wireless communications are increasingly important in maintaining the successful closed-loop operation of mission-critical Industrial Internet of Things (IIoT) applications. To meet the ever-increasing demands on better wireless communications for IIoT, we propose an orthogonal time-frequency space (OTFS) waveform-based joint communication and radio sensing (JCAS) scheme—an energy-efficient solution for not only reliable communications but also high-accuracy sensing. OTFS has been demonstrated to have higher reliability and energy efficiency than the currently popular IIoT communication waveforms. JCAS has also been highly recommended for IIoT, since it saves cost, power, and spectrum compared to having two separate radio frequency systems. Performing JCAS based on OTFS, however, can be hindered by a lack of effective OTFS sensing. This article is dedicated to filling this technology gap. We first design a series of echo preprocessing methods that successfully remove the impact of communication data symbols in the time-frequency domain, where major challenges, such as intercarrier and intersymbol interference and noise amplification, are addressed. Then, we provide a comprehensive analysis of the signal-to-interference-plus-noise ratio (SINR) for sensing and optimize a key parameter of the proposed method to maximize the SINR. The extensive simulations show that the proposed sensing method approaches the maximum-likelihood estimator with respect to the estimation accuracy of target parameters and manifests applicability to wide ranges of key system parameters. Notably, the complexity of the proposed method is only dominated by a 2-D Fourier transform.

An Effective Kalman Based Hybrid Beamforming for Millimeter Wave Massive MIMO System by Using 2D Overlapped Partially Connected Sub-Array Structure

In 5G mobile communication networks, millimeter-wave (mmWave) technology plays a key role. To deal with the problem of path loss that happens in the mmWave band, competent beamforming employing a large antenna array is required. Fully digital beamforming approaches currently require separate radio frequency chains (RF chains) for each antenna, which adds to the computational complexity and hardware expense. In a multi-user environment, fully digital beamforming suffers from a larger antenna array layout, whereas analog beamforming solutions are prone to numerous performance concerns. Hybrid beamforming, on the other hand, offers a promising solution for multi-user mmWave communication. This work proposes a two-dimensional overlapping partially connected (2D-OPC) sub-array structure to reduce the antenna structure's hardware complexity and cost. The suggested technique comprises several sub-arrays that are overlapped in 2D space in the form of a Uniform Planar Array (UPA). The suggested scheme's performance is assessed using Kalman-based hybrid beamforming, which exhibits a considerable increase in spectral efficiency when compared to existing hybrid beamforming techniques. The suggested technique, which uses Kalman based hybrid beamforming and 2D-OPC provides 3.14% and 4.96% improvement over the MMSE hybrid beamforming and ZF pre-coding technique respectively.

Low RF-Complexity Digital Transmit Beamforming for Large-Scale Millimeter Wave MIMO Systems

Digital beamforming (DBF) with full Radio-Frequency (RF) complexity requires a separate RF chain per transmit antenna, which is not only difficult to realize for large-scale MIMO systems but also vulnerable to hardware imperfection. In this paper, we show that DBF architectures don’t necessarily require the number of RF chains to be the same as the number of transmit antennas. We propose a low RF-complexity transmit DBF architecture that enables to use a small number of RF chains to serve a large number of transmit antennas. In our architecture, the transmit antennas are divided into groups. All antennas in the same group share the same RF chain in a time-multiplexed manner to preserve the signal from baseband till the antenna aperture. A novel antenna grouping algorithm is proposed to dynamically group the transmit antennas in a way that each antenna group forms a close-to-rank-one channel matrix with the receive antennas. Under ideal hardware conditions, we show that our DBF architecture can achieve nearly the same performance as that of the conventional full RF-complexity DBF in terms of bandwidth and spectral efficiency. However, when hardware imperfection is considered, our architecture outperforms full RF-complexity DBF in both spectral and energy efficiency because it is more robust to inter RF-chain cross-talk effects due to the reduction on the number of required RF chains.

Carrier-Suppressed Multiple-Single-Sideband Laser Source for Atom Cooling and Interferometry

We present a new electro-optic modulation technique that enables a single laser diode to realize a cold-atom source and a quantum inertial sensor based on matter-wave interferometry. Using carrier-suppressed dual single-sideband modulation, an IQ modulator generates two optical sidebands from separate radio-frequency (rf) signals. These sidebands are controlled independently in frequency, phase, and power using standard rf components. Our laser source exhibits improved rejection of parasitic sidebands compared to those based on phase modulators, which generate large systematic shifts in atom interferometers. We measure the influence of residual laser lines on an atom-interferometric gravimeter and show agreement with a theoretical model. We estimate a reduction of the systematic shift by two orders of magnitude compared to previous architectures, and reach a long-term sensitivity of 15 ng on the gravitational acceleration with an interrogation time of only T = 20 ms. Finally, we characterize the performance of our integrated laser system, and show that it is suitable for mobile sensing applications including gravity surveys and inertial navigation.

2D-OPC Subarray Structure for Efficient Hybrid Beamforming over Sparse mmWave Channels

Millimeter-wave (mmWave) communication is a key technology of 5G new radio (NR) mobile communication systems. Efficient beamforming using a large antenna array is important to cope with the significant path loss experienced in the mmWave spectrum. The existing fully digital beamforming scheme requires a separate radio frequency (RF) chain for each antenna, which results in an excessive hardware cost and consumption power. Under these circumstances, hybrid beamforming which approaches the performance of fully digital beamforming while reducing the complexity is a promising solution for the mmWave multiuser transmission. By extending the existing hybrid beamforming strategies, this paper proposes a novel architecture which effectively reduces the hardware cost and complexity for large antenna arrays. The proposed scheme includes multiple subarrays in the form of uniform planar array (UPA) which are allowed to be overlapped in the two-dimensional space. The corresponding antenna structure is referred to as the two-dimensional overlapped partially connected (2D-OPC) subarray structure. We evaluate the performance of the proposed scheme to suggest performance-complexity trade-offs in designing versatile antenna arrays for efficient beamforming over the mmWave channel.

Radiofrequency Ablation of an 11cm Posterior Transmural Fibroid

Study Objective To document through a case report and video, a successful Laparoscopic Radiofrequency Ablation (Lap RFA) treatment of an 11cm posterior transmural fibroid. Design Video Case Report, 8 months follow up. Setting Hospital OR, Straight Stick Laparoscopy with Laparoscopic Ultrasound and Guidance Mapping. Patients or Participants 29-year-old African American G0 with a one-year history of urinary frequency, urgency, heavy menstrual bleeding and anemia, recently requiring blood transfusion despite COCP's. Preoperative ultrasound imaging showed a 13 × 11 × 9cm uterus with an 11 × 9 × 9cm posterior intramural fibroid. Patient was seeking a minimally invasive, uterine sparing alternative to a myomectomy. Interventions Laparoscopic Radiofrequency Ablation and surgical resection of endometriosis, July 2019, with treatment of one single posterior transmural fibroid, 10 separate radiofrequency ablations, totaling 32minutes of total ablation time. EBL 30cc. No surgical or postoperative complications. Measurements and Main Results Patient reported subjective improvement in urinary frequency, urgency, heavy menstrual bleeding and anemia at 3 months and continued relief at 8 months post-op. 1. Uterus volume shrinkage by 47% by 4 months and remained at 8 months (1287cm^3 to 687cm^3). 2. Fibroid volume shrinkage by 72% by 4 months, and by 79% at 8 months (891cm^3 to 185 cm^3). Conclusion Laparoscopic Radiofrequency Ablation proved to be an effective treatment for fibroid larger than 9cm, in this case an 11 cm posterior intramural fibroid, and resulted in greater than 70% volume reduction and patient symptom relief by 4 months post-op.

Phase Noise in Modular Millimeter Wave Massive MIMO

This paper investigates the effect of oscillator phase noise on a multiuser millimeter wave (mmWave) massive MIMO uplink as we scale up the number of base station antennas, fixing the load factor, defined as the ratio of the number of simultaneous users to the number of base station antennas. We consider a modular approach in which the base station employs an array of subarrays, or “tiles.” Each tile supports a fixed number of antennas, and can therefore be implemented using a separate radio frequency integrated circuit (RFIC), with synchronization across tiles accomplished by employing a phased locked loop in each tile to synthesize an on-chip oscillator at the carrier frequency by locking on to a common lower frequency reference clock. Assuming linear minimum mean squared error (LMMSE) multiuser detection, we provide an analytical framework that can be used to specify the required power spectral density (PSD) mask for phase noise for a target system performance. Our analysis for the phase noise at the output of the LMMSE receiver indicates two distinct effects: self-noise for each user which is inversely proportional to the number of tiles, and cross-talk between users which is insensitive to the number of tiles, and is proportional to the load factor. These analytical predictions, verified by simulations for a 140 GHz system targeting a per-user data rate of 10 Gbps, show that tiling is a robust approach for scaling. Numerical results for our proposed design approach yield relatively relaxed specifications for phase noise PSD masks.

Hybrid Beamforming for 5G and Beyond Millimeter-Wave Systems: A Holistic View

Millimeter-wave (mm-wave) communication is a key technology for future wireless networks. To combat significant path loss and exploit the abundant mm-wave spectrum, effective beamforming is crucial. Nevertheless, conventional fully digital beamforming techniques are inapplicable, as they demand a separate radio frequency (RF) chain for each antenna element, which is costly and consumes too much energy. Hybrid beamforming is a cost-effective alternative, which can significantly reduce the hardware cost and power consumption by employing a small number of RF chains. This paper presents a holistic view on hybrid beamforming for 5G and beyond mm-wave systems, based on a new taxonomy for different hardware structures. We take a pragmatic approach and compare different proposals from three key aspects: 1) hardware efficiency, i.e., the required hardware components; 2) computational efficiency of the associated beamforming algorithm; and 3) achievable spectral efficiency, a main performance indicator. Through systematic comparisons, the interplay and trade-off among these three design aspects are demonstrated, and promising candidates for hybrid beamforming in future wireless networks are identified.

Steady‐state imaging with inhomogeneous magnetization transfer contrast using multiband radiofrequency pulses

PurposeInhomogeneous magnetization transfer (ihMT) is an emerging form of MRI contrast that may offer high specificity for myelinated tissue. Existing ihMT and pulsed MT sequences often use separate radiofrequency pulses for saturation and signal excitation. This study investigates the use of nonselective multiband radiofrequency pulses for simultaneous off‐resonance saturation and on‐resonance excitation specifically for generation of ihMT contrast within rapid steady‐state pulse sequences.Theory and MethodsA matrix‐based signal modeling approach was developed and applied for both balanced steady state free precession and spoiled gradient echo sequences, accounting specifically for multiband pulses. Phantom experiments were performed using a combination of balanced steady state free precession and spoiled gradient echo sequences, and compared with model fits. A human brain imaging exam was performed using balanced steady state free precession sequences to demonstrate the achieved contrast.ResultsA simple signal model derived assuming instantaneous radiofrequency pulses was shown to agree well with full integration of the governing equations and provided fits to phantom data for materials with strong ihMT contrast (PL161 root mean square error = 0.9%, and hair conditioner root mean square error = 2.4%). In vivo ihMT ratio images showed the expected white matter contrast that has been seen by other ihMT investigations, and the observed ihMT ratios corresponded well with predictions.ConclusionsihMT contrast can be generated by integrating multiband radiofrequency pulses directly into both spoiled gradient echo and balanced steady state free precession sequences, and the presented signal modeling approach can be used to understand the acquired signals.

Effects of superimposed dual-frequency (13.56/2 MHz) inductively coupled plasma source on the uniformity of Ar/CF4 plasma

As one of the methods for controlling the plasma uniformity, superimposed dual frequencies of 13.56 and 2 MHz were used on an inductively coupled plasma (ICP) source, and the effects of the superimposed dual-frequency ICP on the plasma and etch uniformities were investigated and compared with a conventional single-frequency ICP operation at 13.56 MHz using Ar/CF4. The superimposed dual-frequency ICP operated at 13.56 and 2 MHz improved the plasma uniformity compared to the single-frequency ICP for both Ar and Ar/CF4 by improving the plasma density near the center region of the wafer close to the edge region. In addition, for Ar plasma, a change in the power ratio of 2/13.56 MHz during the superimposed dual-frequency operation changed the EEDF of the plasma and the IED toward the wall. When SiO2 was etched using Ar/CF4 with the superimposed dual-frequency ICP while biasing the substrate with a separate radio frequency power of 12.56 MHz, similar to the results on the plasma uniformity, the SiO2 etch uniformity within a 300 mm diameter wafer was improved by using the superimposed dual-frequency ICP operated at 13.56 and 2 MHz, as compared to that using a single-frequency ICP of 13.56 MHz.

Decentralized Equalization With Feedforward Architectures for Massive MU-MIMO

Linear data-detection algorithms that build on zero forcing (ZF) or linear minimum mean-square error (L-MMSE) equalization achieve near-optimal spectral efficiency in massive multi-user multiple-input multiple-output (MU-MIMO) systems. Such algorithms, however, typically rely on centralized processing at the base-station (BS) which results in (i) excessive interconnect and chip input/output (I/O) data rates and (ii) high computational complexity. Decentralized baseband processing (DBP) partitions the BS antenna array into independent clusters that are associated with separate radio-frequency circuitry and computing fabrics in order to overcome the limitations of centralized processing. In this paper, we investigate decentralized equalization with feedforward architectures that minimize the latency bottlenecks of existing DBP solutions. We propose two distinct architectures with different interconnect and I/O bandwidth requirements that fuse the local equalization results of each cluster in a feedforward network. For both architectures, we consider maximum ratio combining, ZF, L-MMSE, and a nonlinear equalization algorithm that relies on approximate message passing, and we analyze the associated post-equalization signal-to-noise-and-interference-ratio (SINR). We provide reference implementation results on a multi graphics processing unit (GPU) system which demonstrate that decentralized equalization with feedforward architectures enables throughputs in the Gb/s regime and incurs no or only a small performance loss compared to centralized solutions.

Integrated Cooperative Ambient Power Harvester Collecting Ubiquitous Radio Frequency and Kinetic Energy

An integrated cooperative harvester capable of collecting both electromagnetic [(principally radio frequency (RF)] and kinetic energy simultaneously is proposed and studied in this paper. One single substrate board is demonstrated to accommodate and integrate an electromagnetic kinetic generator, an F-shaped antenna, and a rectifying circuit, having a compact credit-card size. Cooperative harvesting mode enables a significant enhancement of the diode’s power conversion efficiency (PCE) and also greatly strengthening the resilience of harvester at the same time. Measured results suggest that SMS7630 and HSMS-2850-based cooperative harvesters can increase dc output power by 50% to around 100% when both injecting power sources exhibit below −37 dBm with reference to the total added amount of dc power harvested directly from separate RF and kinetic excitation modes. A closed-form method is proposed and used to predict the enhanced efficiency performance of the cooperative harvester within a low power range of interest (from −50 to −30 dBm). Our analysis highlights the roles of the diode’s nonlinear junction resistance and capacitance. Good agreements are observed when comparing the analysis results with harmonic balance simulations by ADS. Furthermore, this method is carefully verified by measured results of two different diode-based harvesters. Measured dc output power rectified from cooperative harvesting mode is reported to be 1.16 and 1.97 times larger with SMS7630 and HSMS-2850, respectively, when both power sources are −40 dBm, compared to the conventional single RF harvesting mode. The proposed cooperative harvester with its strong resilience is highly suitable for ambient power harvesting in an ever-changing environment.

Alignment sensing for optical cavities using radio-frequency jitter modulation.

Alignment sensing is often required in precision interferometry applications such as Advanced LIGO in order to achieve the optimum performance. Currently favored sensing schemes rely on the use of two separate radio-frequency (RF) quadrant photodetectors and Gouy phase telescopes to determine the alignment of a beam relative to an optical cavity axis. In this paper, we demonstrate an alternative sensing scheme that has potential advantages over the current standard schemes. We show that by using electro-optic beam deflectors to impose RF jitter sidebands on a beam, it is possible to extract full alignment signals for two in-line optical cavities from just one single-element photodetector in reflection of each cavity.

Robotic application of a novel dual-energy device for left atrial ablation: intraoperative and early postoperative results.

Recent trials show that in patients with atrial fibrillation (AF), pulmonary vein isolation performed with bipolar surgical ablation clamps using small bilateral thoracotomies is more effective than pulmonary vein isolation using standard catheter ablation. This improved efficacy comes with higher invasiveness including difficulty in execution and potentially more acute complications. Monopolar "loop" devices overcome these drawbacks but at the potential cost of decreased efficacy. Technology that has bipolar effectiveness but with improved access and safety profiles, capable of being deployed endoscopically on a beating heart, would be desirable. We evaluated an ablation system that may have all of these characteristics. Between May 2012 and May 2013, 30 patients were treated surgically for AF using a right-sided endoscopic approach with robotic assistance. In each patient, a "box" ablation lesion set was created around all pulmonary veins with a new linear suction-applied dual-mode (monopolar and bipolar) radiofrequency (RF) ablation device that was looped around the pulmonary veins. Temperature-controlled RF was applied for 60 seconds, with a set temperature of 70°C, first in the bipolar mode and then in a separate RF ablation for 60 seconds at 70°C in the monopolar mode. Acute effectiveness of the procedure was assessed using conduction block testing and by attempting to induce sustained AF with rapid atrial pacing. The left atrial appendage (LAA) was occluded in all patients with multiple ENDOLOOP snares using a left video-assisted thoracoscopic surgery approach under transesophageal echocardiography guidance, after which the tip of the LAA was incised to empty the LAA of blood. All patients were seen clinically at 30, 90, and 180 days with routine electrocardiography monitoring: at 6 months, 24-hour Holter monitoring was performed. Acute conduction block was achieved in 93% the of patients, and sustained AF could not be induced by rapid atrial pacing after the surgical ablation procedure in 90% of the patients. At 3- and 6-month follow-up, 88% and 81% of the patients, respectively, were in sinus rhythm. Of 16 the patients seen at 12-month follow-up, 14 (88%) were in sinus rhythm with 44% still on antiarrhythmic medications. The newly introduced bipolar/monopolar RF ablation device can be easily positioned using a right endoscopic approach. Robotic assistance enables effective fat removal for accurate and easy placement of the device around the pulmonary veins. With the use of this approach, the device is safe and effective in electrically isolating the pulmonary veins.

A Two-Antenna Single RF Front-End DOA Estimation System for Wireless Communications Signals

Both adaptive beamforming methods and interference management systems improve the capacity of wireless communications systems, however they may require direction of arrival (DOA) information of signals. On the other hand, most of the DOA estimation systems suffer from computational complexity, high costs, and bulky size which prevents mobility. Antenna array inflexibility of DOA estimation systems also prevents prevalence over the whole wireless spectrum. In this paper, a solution to these problems which benefits from the advantages of switched antenna systems along with the time-variant sequential sampling process is proposed: a two-antenna, single radio-frequency (RF) front-end DOA estimation system which extends the measurements to different locations by shifting the antenna tuple together as a single entity. The system adjusts the antenna spacing for adaptive spectrum coverage. An extension to total measurement time is introduced, however, when compared to DOA estimation systems which have separate RF front-end for each antenna, the system has moderate complexity and size. A measurement setup is developed and performance of the proposed system is provided for extensive set of wireless standards and measurement parameters. Multiple signal classification is selected as DOA method for the proposed system and the DOA estimation performance is compared with the pseudo-Doppler system.

Bi-Directional Excitation of Radio Frequency Waves Using a Helical Antenna in Non-Uniform Plasmas towards a Compact Magnetoplasma Thruster

Magnetoplasma thruster is one of the attractive plasma engines for space propulsion in future manned deep space exploration. Usually two helical antennas are equipped to produce and heat plasmas with separate radio frequency sources. It is presented in this paper that a helical antenna, which is used to launch one wave mode in one direction so far, exhibits bi-directional nature, where the waves with different mode numbers are launched and couple with electrons and ions selectively in opposite directions. A two-dimensional numerical calculation is performed to predict wave propagation and power absorption in a non-uniform hydrogen plasma immersed in a non-uniform external static magnetic field, based on the hot plasma theory. It is confirmed that appropriate choice of the excitation condition of the antenna can select axial propagation direction of specific wave modes and consequently select a species that absorbs power from generated waves. A small-scale experiment is performed to confirm the prediction of the calculation. By measuring a change in electron and ion temperatures due to the wave launch from the helical antenna, it is found that both the production and heating at different axial positions are accomplished simultaneously by one antenna showing that another type of the radio frequency driven magnetoplasma thruster would be achieved.

Robotic Application of a Novel Dual-Energy Device for Left Atrial Ablation

Recent trials show that in patients with atrial fibrillation (AF), pulmonary vein isolation performed with bipolar surgical ablation clamps using small bilateral thoracotomies is more effective than pulmonary vein isolation using standard catheter ablation. This improved efficacy comes with higher invasiveness including difficulty in execution and potentially more acute complications. Monopolar "loop" devices overcome these drawbacks but at the potential cost of decreased efficacy. Technology that has bipolar effectiveness but with improved access and safety profiles, capable of being deployed endoscopically on a beating heart, would be desirable. We evaluated an ablation system that may have all of these characteristics. Between May 2012 and May 2013, 30 patients were treated surgically for AF using a right-sided endoscopic approach with robotic assistance. In each patient, a "box" ablation lesion set was created around all pulmonary veins with a new linear suction-applied dual-mode (monopolar and bipolar) radiofrequency (RF) ablation device that was looped around the pulmonary veins. Temperature-controlled RF was applied for 60 seconds, with a set temperature of 70°C, first in the bipolar mode and then in a separate RF ablation for 60 seconds at 70°C in the monopolar mode. Acute effectiveness of the procedure was assessed using conduction block testing and by attempting to induce sustained AF with rapid atrial pacing. The left atrial appendage (LAA) was occluded in all patients with multiple ENDOLOOP snares using a left video-assisted thoracoscopic surgery approach under transesophageal echocardiography guidance, after which the tip of the LAA was incised to empty the LAA of blood. All patients were seen clinically at 30, 90, and 180 days with routine electrocardiography monitoring: at 6 months, 24-hour Holter monitoring was performed. Acute conduction block was achieved in 93% the of patients, and sustained AF could not be induced by rapid atrial pacing after the surgical ablation procedure in 90% of the patients. At 3- and 6-month follow-up, 88% and 81% of the patients, respectively, were in sinus rhythm. Of 16 the patients seen at 12-month follow-up, 14 (88%) were in sinus rhythm with 44% still on antiarrhythmic medications. The newly introduced bipolar/monopolar RF ablation device can be easily positioned using a right endoscopic approach. Robotic assistance enables effective fat removal for accurate and easy placement of the device around the pulmonary veins. With the use of this approach, the device is safe and effective in electrically isolating the pulmonary veins.

Successful radiofrequency ablation of an anterior abdominal wall desmoid in familial adenomatous polyposis

Desmoid tumours are an important cause of mortality in familial adenomatous polyposis (FAP). There are few effective treatment strategies. This report describes the use of radiofrequency ablation to debulk and palliate an abdominal wall desmoid tumour in FAP. A 22 year old woman with FAP developed a large abdominal wall desmoid tumour after restorative proctocolectomy. The tumour was treated with 16 separate radiofrequency ablations. The follow up was 36 months from the first ablation. The procedure was well tolerated with minor complications; mild superficial cellulitis and skin ulceration occurred following only one of the ablation sessions. Repeated radiofrequency treatments resulted in a sustained reduction in size and symptoms from the desmoid tumour. Given the low efficacy of treatments for desmoids in FAP, radiofrequency ablation appears to be a promising modality.

Estimating Cyclic Shear Strain in the Common Carotid Artery Using Radiofrequency Ultrasound

There is increasing evidence that supports the hypothesis that elevated cyclic shear strain in the adventitia of the common carotid artery promotes plaque progression. In this article, we estimated cyclic shear strain in the carotid arterial wall in 16 asymptomatic human participants using radio-frequency (RF) ultrasound. In each participant, we acquired two separate RF ultrasound recordings. We correlated the cyclic shear strain with the distension waveform (representing the blood pressure waveform) of the carotid artery and the brachial blood pressure. There were no significant differences between the shear strains estimated from the two separate RF ultrasound recordings. The point-in-time of the maximum shear strain showed a significant correlation with that of the dicrotic notch in the distension waveform (Spearman’s coefficient = 0.7, p < 0.001). The pulse shear strain (difference between maximum and minimum shear strain) was significantly correlated with the pulse pressure as measured in the brachial artery (Spearman’s coefficient = 0.4, p < 0.01). In this study, we show that the cyclic shear strain in the adventitia of the common carotid artery can be estimated using RF ultrasound. We found indications that the estimated cyclic shear strain was induced by the pulsating blood pressure and it was found to be higher in participants with an elevated pulse pressure.