UWB Interference Research Articles

Routing Technique for Microwave Transmission Lines to Ensure UWB Interference Immunity

This article presents a novel routing technique for designing microwave transmission lines (TLs) that provide improved functionality. Unlike traditional practices, we propose locating two independent traces close to each other, resulting in strong electromagnetic coupling and potential unwanted crosstalk between traces. However, we show that the suggested routing schemes can significantly increase the ultra-wideband interference immunity of electrical circuits by using modal distortions and reflections, as demonstrated in our study of four prototypes of TLs in the form of serpentine and spiral designs with strong and weak coupling between pairs. To better predict and analyze the microwave behavior in such TLs, we used new simulation techniques based on the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$N$</tex-math> </inline-formula> -norms study. Our investigation of these TLs in a transverse electromagnetic cell in the frequency range from 10 MHz to 5.3 GHz showed a low level of radiated emissions. The results indicate that the serpentine scheme with strong coupling between pairs provides the best protection of two independent TLs against ultra-wideband interferences. Moreover, the used electrodynamic approach is in full agreement with the experimental study, further validating the effectiveness of the proposed routing technique.

Orientational Beamforming via a Modified RBF Neural Network for Orientational UWB Interference Rejection

Orientational Beamforming via a Modified RBF Neural Network for Orientational UWB Interference Rejection

Анализ и систематизация способов трассировки печатных проводников на основе симметричных структур с модальной фильтрацией

To improve the functional safety of radioelectronic equipment, a redundancy of its components, parts, and interconnections is used. In contrast to the widely used cold redundancy, the modal reservation (MR) technology protects nodes and interconnections from ultra-wideband interference (UWB) by modal distortions. There are several approaches and methods to ensure a multiple MR. These methods have different design features, electrical and mass-size characteristics, and scope of application. Of special interest are the structures with conductor symmetry along two planes that allow realizing triple MR with the same efficiency of UWB interference suppression for any circuit. This work aims to present a novel analysis and systematization of methods of multiple MR based on symmetrical structures. To solve this problem, we evaluated the technology effectiveness of eight MR methods, their operability, and efficiency. The authors performed an evaluation of decomposed pulses for each structure before and after failure using N-norms. It is found that all investigated structures with modal redundancy allow to significantly attenuate the ultrawideband pulse.

Kuznets curve with parabola-shaped ultra-wideband antenna with defected ground plane for communications

PurposeThis paper aims to state the configuration of the proposed antenna which is competent to many networks such as LTE and X band applications. The experimental study encountered the significance of the proposed antenna.Design/methodology/approachA novel compact Kuznets curve with parabola-shaped quad-band notched antenna is demonstrated in this paper. The presented prototype is ascertained on a composite material composed of woven fiberglass cloth with an epoxy resin binder. The resulting ultra-wideband antenna ranges 3.1–3.54 GHz, 5.17–5.51 GHz, 5.74–6.43 GHz and 6.79–7.60 GHz. To avoid the frequency bands which cause UWB interference,the projected antenna has been incorporated with slotted patch. The proposed antenna design is attained in four steps. The simple circular patch antenna model with defected ground plane is subjected to stepwise progression by including parabola-shaped slot and U shaped slot on the patch to attain four notched bands.FindingsThis projected antenna possesses an optimal bond among simulated and measured outcomes,which is more suitable for the quad notched band applications. Substrate analysis is done by varying substrate material, and notch behavior is presented. The proposed method’s optimum performance in metrics such as return loss, voltage standing wave ratio and radiation pattern varies its frequency range from 2.56 to 7.6 GHz.Originality/valueThe antenna adaptation of the defected ground plane has achieved through the quad notched band with operating frequency ranges 2.56 to 7.6 GHz and with eliminated frequency ranges 3.55–5.16 GHz, 5.52–5.73 GHz, 6.44–6.78 GHz and 7.66–10.6 GHz.

Performance Evaluation of Downlink WiMAX System in Vicinity of UWB System

In this paper, we evaluate the performance of WiMAX downlink system in vicinity of UWB system. The study is achieved via simulating a scenario of an office building which utilizes from both WiMAX and UWB appliances. From the simulation results, we found that WiMAX system is largely affected by the UWB interference. However, in order to overcome the interference problem and achieve reasonable BER (Bit Error Rate) of 10−4, we found that it is very necessary to raise the WiMAX transmitted power in relative to that of UWB interferer. So, the minimum requirements for WiMAX system to overcome UWB interference are stated here in this work.

Performance Evaluation of Downlink WiMAX System in Vicinity of UWB System

In this paper, we evaluate the performance of WiMAX downlink system in vicinity of UWB system. The study is achieved via simulating a scenario of an office building which utilizes from both WiMAX and UWB appliances. From the simulation results, we found that WiMAX system is largely affected by the UWB interference. However, in order to overcome the interference problem and achieve reasonable BER (Bit Error Rate) of 10-4, we found that it is very necessary to raise the WiMAX transmitted power in relative to that of UWB interferer. So, the minimum requirements for WiMAX system to overcome UWB interference are stated here in this work.

A Study on the Effect of UWB Interference on Downlink UMTS System

In this paper, we evaluate the performance of UMTS (Universal Mobile Telecommunication System) downlink system in vicinity of UWB system. The study is achieved via simulating a scenario of a building which is located within UMTS cell borders and utilizes from both UMTS and UWB appliances. The simulation results show that the UMTS system is considerably affected by the UWB interference. However, in order to battle this interference and achieve reasonable BER (Bit Error Rate) of 10−4, we found that it is very necessary to carefully raise the UMTS base station transmitted power against that of UWB interferer. So, the minimum requirements for UMTS system to overcome UWB interference are stated in this work.

A Study on the Effect of UWB Interference on Downlink UMTS System

In this paper, we evaluate the performance of UMTS (Universal Mobile Telecommunication System) downlink system in vicinity of UWB system. The study is achieved via simulating a scenario of a building which is located within UMTS cell borders and utilizes from both UMTS and UWB appliances. The simulation results show that the UMTS system is considerably affected by the UWB interference. However, in order to battle this interference and achieve reasonable BER (Bit Error Rate) of 10-4, we found that it is very necessary to carefully raise the UMTS base station transmitted power against that of UWB interferer. So, the minimum requirements for UMTS system to overcome UWB interference are stated in this work.

Overview and Analysis of UWB signal for Low Power WPAN

In modern short range wireless applications, RF, Bluetooth and UWB communication schemes are recommended with respect to power consumption, low/high data rates and location capability. Though special bandwidth is not allocated to UWB, coexistence of such signal in the available RF environment is a critical issue and hence analysis of UWB signal with respect to interference is very much required in dedicated WPAN networks. In this paper, effect of UWB interference for existing systems such as GPS, FWA, UMTS, DCS1800 is analyzed. Communication path distance is directly proportional to the UWB signal pulse width. To correctly define the UWB signal this functionality is realized by composing UWB signal and results are simulated using MATLAB.

국내 DAA 기술 기준을 고려한 MB-OFDM UWB 성능 평가

본 논문의 목적은 <TEX>$3.1{\sim}4.8$</TEX> GHz 대역에서 UWB를 허용하기 위해 국내에서 제시한 DAA 기술 기준을 적용하여 MB-OFDM UWB(Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band) 시스템과 피 간섭신호간의 성능을 평가하는 것이다. DAA 기술 기준에서 정한 피 간섭 신호로는 유럽에서 DAA 적용 시스템으로 검토하고 있는 WiMAX나 국내에 도입될 것으로 예상되는 4G 시스템 등이 있다. MB-OFDM UWB 시스템은 TFC(Time Frequency Code)에 따라 심볼마다 3개 주파수 대역을 호핑하는 TFI(Time frequency Interleaving) 모드와 하나의 주파수 대역을 선택하여 신호를 전송하는 FFI(Fixed Frequency Interleaving) 모드를 지원한다. 본 논문에서는 호핑 모드에 따른 간섭 영향을 정확하게 분석하기 위해 TFC에 따른 평균 송신 출력 및 동기 구조를 반영하여 시뮬레이션을 수행하였다. 분석 결과, 국내 DAA 기술 기준을 적용할 경우, UWB 간섭 신호로부터 Wi-MAX 통신 시스템은 철저히 보호되는 반면, MB-OFDM UWB 시스템은 DAA 검출 레벨의 간섭 신호에 의해 주파수 다양성 효과를 얻을 수 있는 주파수 호핑 모드에서 조차 심각한 성능 저하가 발생하였다. The purpose of this paper is to analyze the performance of MB-OFDM UWB system when the interference signal that can be WIMAX signal or 4 G system signal is received by detection limit of -80 dBm/MHz proposed in Korea for DAA(Detect And Avoid) to permit UWB in <TEX>$3.1{\sim}4.8$</TEX> GHz. MB-OFDM UWB system supports two transmission modes; one is TFI(Time frequency Interleaving) mode that transmits OFDM symbols using different carrier frequency from symbol to symbol according to Time Frequency(TF) codes, the other is FFI(Fixed Frequency Interleaving) mode that transmits OFDM symbols using a specific carrier frequency. In this paper, we considered the TX average power and the synchronization structure to reflect the effect of frequency hopping according to TFC. Interference analysis results show that the WiMAX system is fenced thoroughly from UWB interference in domestic DAA regulation, but the performance of MB-OFDM UWB system is degraded seriously by an interference signal with the DAA detection limit even in frequency Hopping mode that can get frequency diversity effect.

Proposed Analytic Modeling for the Performance Effects of UWB on Broadband Network

This paper evaluates the interference effect of Ultra-wideband devices on the broadband network. Also, an analytic scheme based on the system level simulation is proposed. A proposed analytic modeling approach includes an assumed scenario based on a geometric model, the estimation of an interfering UWB power level, and the approach based on the system level simulation for the evaluation. Results show throughput losses or outages of the broadband network due to UWB interference. As a conclusion of research, UWB emission should be limited to protect the broadband network.

On the Coexistence of DS-UWB Systems with Wi-Max/IEEE-802.16 Based Systems

In this paper the coexistence issue between the DS-UWB systems and Wi-Max/IEEE-802.16 based Fixed Broadband Wireless Access (FBWA) systems has been investigated. The aim is to evaluate the impact that the interference resulting from a realistic UWB hot spot scenario may have on the performance of a FBWA receiver. A mathematical model is developed through which the interference power produced by the UWB hot spot can be calculated. The benchmarks against which the UWB interference is assessed are also developed using the specifications of Wi-Max/IEEE-802.16 systems. Several simulations have been done to both validate the analytical results and calculate the UWB interference. In doing so, the effects of parameters like victim receiver bandwidth, carrier frequency, activity factor, the number of users and the distance from victim receiver in a realistic hot spot scenario have been studied.

Soft-Spectrum Adaptation for Detection and Avoidance of UWB Interference to Existing Radio Systems

Soft-Spectrum Adaptation for Detection and Avoidance of UWB Interference to Existing Radio Systems

Measurements of the performance degradation of UMTS receivers due to UWB emissions

Results of experimental trials performed to assess the coexistence of the UMTS systems and the UWB emissions are presented. The performance degradation of the UMTS system vs. the in-channel UWB interference power has been measured in terms of the bit error rate and the noise rise.

Software approach to access UWB interference on GPS receivers

Ever since the FCC approved the use of UWB devices in commercial and federal bands, various agencies whose operations and/or products rely on the integrity of signals within certain restricted radio frequency bands have voiced concerns over the potential impact of the UWB interference. GPS signals are among these restricted bands. Several groups in the GPS community have conducted experimental studies concerning the impact of UWB interference on the performance of various grades of commercial and aviation GPS receivers. In this paper, we present a software approach to simulate and evaluate UWB interference on GPS receivers. The software approach provides greater flexibility in the design of testing scenarios, such as the inclusion of a large number of aggregated UWB devices, the generation of new UWB signals and modulation schemes, and the possibility of extending the study to new GPS signals. The paper discusses a general framework for developing algorithms to evaluate UWB and GPS interference under a wide variety of hardware and software conditions. This framework consists of three classes of components: input, processing, and analysis. The input components are responsible for the generation of UWB signal waveforms and modulation schemes, and GPS signals. The processing components include a simulated model of GPS RF front end and software implementation of GPS processing blocks, such as acquisition, tracking, and post-processing. The analysis components focus on the study of specific receiver processing component outputs. Both real and simulated UWB signals can be used in the study. The real UWB signals are primarily used to validate the simulation procedure, whereas the simulated UWB signals are used to allow the immediate incorporation of new UWB waveforms and modulations in the evaluations. This paper presents details of the software components developed and the preliminary results achieved

Performance of Wi-Max receiver in presence of DS-UWB system

The effect of UWB interference on a Wi-Max receiver has not been addressed in the literature. This effect is analysed and it is shown that for a realistic scenario a DS-UWB system interference will not have a destructive effect on the performance of a Wi-Max receiver.