Joint Reception Research Articles

ASR News & Announcements

Preparations for this summer’s 84th Annual Meeting are in full swing. The meeting will be held August 19–21, 2023 at the Bellevue Hotel Philadelphia. We will begin with a Welcome Reception on the evening of Saturday, August 19. We are planning this reception as a joint reception with the ASA Religion Section. The Presidential Address will be given by Gerardo Marti, and the Furfey Lecture will be delivered by Penny Edgell from the University of Minnesota. The ASA Sociology of Religion Section day is Saturday, August 19. The hotel reservation link, meeting registration, and information about Philadelphia will available on Annual Meeting page of the ASR website, www.sociologyofreligion.com. If you have not yet made your hotel reservations, please do so immediately. ASR’s discounted room rate is good only through the middle of July. Please double check the nights that you want to stay in the hotel. The ASR understands that the hotel may be expensive. The $219 room rate is a discounted rate, and the ASR got the best deal that we could. Please know that you are contributing to the vibrancy of the ASR by staying at the ASR hotel:

Carrier Characteristic Bias Estimation between GNSS Signals and Its Calibration in High-Precision Joint Positioning

A distinctive feature of modern Global Navigation Satellite System (GNSS) signals is that they transmit multiple signal components at the same carrier frequencies. The idea of joints across the signal channels from the same carrier frequency and even across different frequencies has been presented in many studies for tracking purposes. Carrier joint tracking is required on the premise that the frequency and phase relationship between signals are nominal values, and the bias of carrier characteristics between signals is drowned in noise as the signal reaches the ground, which requires high-gain receiving equipment to restore the original signal. The space signal-quality monitoring and evaluation system built by the National Timing Center of the Chinese Academy of Sciences is based on a 40 m dish antenna, which can automatically track a single satellite and achieve a high-fidelity reception of navigation signals to a certain extent, realizing fine signal quality monitoring (SQM) of GNSS satellites. Based on this platform, we discuss four types of time distributions of the combined signals among different signal components and provide a method to estimate the carrier characteristic bias between GNSS signals. We derived the correction method of carrier characteristic bias in the joint reception by the joint tracking mathematical model. Under the conditions of narrow correlation and unobstructed case, the carrier characteristic deviation does not vary significantly with the correlator interval and the satellite elevation angle. Based on the results of stability analysis, it is recommended that the receivers should update the carrier frequency bias correction number of the intra-frequency signal and carrier phase bias correction number of the intra-frequency signal monthly. The carrier phase deviation correction number of the inter-frequency signal is performed daily. The measured data from satellites show that the phase accumulation error of the joint tracking carrier loop can be eliminated to achieve long-term stable tracking after frequency bias correction. After the carrier phase bias correction, the joint positioning accuracy of the B2a and B2b signals was improved by 0.81%, and those of the B1C, L1C, E1C, and B2a signals were improved by 0.35%, 0.04%, 0.20%, and 0.11%, respectively. The positioning accuracy improvement effect of inter-frequency signals was greater than that of intra-frequency signals after carrier phase correction.

Enhancing coordinated multi-point joint reception with dynamic bandwidth allocation

Coordinated Multipoint (CoMP) Joint Reception (JR) is a vital technology to mitigate uplink inter-cell interference (ICI) and can be facilitated by the centralized radio access network (C-RAN). In C-RAN architecture, base stations (BSs) are decoupled into the central unit (CU) and the distributed units (DUs). Meanwhile, a fronthaul (FH) is employed to connect CU and DUs. However, FH constructed by the time division multiplexing passive optical network (TDM-PON) significantly affects the performance of JR. The inherent polling mechanism of TDM-PON results in the asynchronous forwarding of JR data, which leads to high JR latency and a large amount of storage consumption. To alleviate the problem, we presented a novel dynamic bandwidth allocation (DBA) scheme, which classifies network data as JR and non-JR data and optimizes the data forwarding order of different types and DUs. A heuristic algorithm called Rearrange Sub-timeslot DBA (RS-DBA) was proposed to implement the DBA scheme. Simulation results indicate the proposed RS-DBA algorithm can reduce the average latency of JR data and storage resources consumption. In addition, the RS-DBA can make a better tradeoff between latency and efficiency.

Chalcedon on the Road to Justice and Peace

AbstractIn the context of the bilateral dialogue between the Mar Thoma Syrian Church and the Old Catholic Churches of the Union of Utrecht, the question of Christology – and with that the joint reception of the conciliar tradition of the early church – played an important role, given the “families” of churches that both traditions belong to: “Western Catholic” and “Oriental.” This paper, written from the vantage point of Old Catholic ecumenical theology, analyzes how the topic of (Chalcedonian) Christology was addressed in this dialogue and places it in the context of the broad ecumenical movement. The dialogue focused reception on the content rather than on the wording of patristic convictions. This focus, as well as the willingness to look beyond confessional categories, facilitated a joint understanding of Christology that did justice to both of the traditions involved and was a faithful reflection of the conciliar tradition regarding Christology.

Joint Reception Method and Monopulse Direction Detecting of Signals of Radio-Radiating Dynamic Objects

A method for joint reception and monopulse direction-finding of signals of radio-emitting dynamic objects based on equalization of the transmission coefficients in the direction-finding channels by noise dispersion is proposed. The mathematical apparatus used in seeking a solution was fuzzy set theory. The efficiency of the method is confirmed by the results of field tests.

Phase-coherent lightwave communications with frequency combs

Fiber-optical networks are a crucial telecommunication infrastructure in society. Wavelength division multiplexing allows for transmitting parallel data streams over the fiber bandwidth, and coherent detection enables the use of sophisticated modulation formats and electronic compensation of signal impairments. Optical frequency combs can replace the multiple lasers used for the different wavelength channels. Beyond multiplexing, it has been suggested that the broadband phase coherence of frequency combs could simplify the receiver scheme by performing joint reception and processing of several wavelength channels, but an experimental validation in a fiber transmission experiment remains elusive. Here we demonstrate and quantify joint reception and processing of several wavelength channels in a full transmission system. We demonstrate two joint processing schemes; one that reduces the phase-tracking complexity and one that increases the transmission performance.

Analysis of Joint Channel Coexistence Time at Space-Diversity Radio Reception of Meteor Reflections

This paper examines the possibility of joint reception of radio reflections from the same meteor trails simultaneously at two spaced receivers. A refined simulation of a joint reception area (JRA) of meteor radio reflections on the basis of a diffraction theory of oblique scattering of radio waves off ionized meteor trails is performed for radio links of moderate (500 km) and medium (1000 km) lengths. The obtained results may be particularly useful for territory planning of meteor burst communication (MBC) networks with the spatial division of subscribers (SDMA technology). The simulated JRAs also characterize an interception probability of messages. This knowledge is especially important in designing highly secure MBC, such as meteor key distribution systems, intended for the creation of two identical copies of a shared secret key at both sides of the meteor radio link.

Wireless performance and mobile fronthaul bandwidth of uplink joint reception with LLR combining in split-PHY processing

In this paper, we evaluate the wireless uplink performance and the mobile fronthaul (MFH) bandwidth of split-physical layer (PHY) processing (SPP), which is a base station (BS) functional split scheme used to link baseband units (BBUs) and remote radio heads (RRHs) in a centralized/cloud — radio access network (C-RAN). SPP enables MFH bandwidth reduction by splitting the BS functions between channel coding/decoding and modulation/demodulation within the PHY layer functions. SPP also enables high coordinated multipoint (CoMP) transmission and reception performance by employing uplink joint reception (JR) with log likelihood ratio (LLR) combining. Link level simulation results show that SPP with LLR combining achieves a block error rate (BLER) performance of 10% with a signal to noise ratio (SNR) penalty of less than 1 dB compared with that of conventional CRAN, which centralizes PHY layer functions in BBU. In addition, SPP has an SNR gain of more than 3 dB over medium access control (MAC)-PHY split, which splits the BS functions between the MAC and PHY layer functions. System level simulation results show that SPP with LLR combining improves the cell-edge user throughput by more than 33% over MAC-PHY split with selection combining and reduces the MFH bandwidth by 91% when compared with conventional C-RAN. Moreover, link and system level simulation results above are also observed when the channel estimation is non-ideal.

Low-complexity distributed algorithms for uplink CoMP in heterogeneous LTE networks

Coordinated multi-point transmission (CoMP) techniques are being touted as enabling technologies for interference mitigation in next generation heterogeneous wireless networks (HetNets). In this paper, we present a comparative performance study of uplink (UL) CoMP algorithms for the 3GPP LTE HetNets. Focusing on a distributed and functionally-split architecture, we consider six distinct UL-CoMP algorithms: 1. Joint reception in the frequency-domain (JRFD) 2. Two-stage equalization (TSEQ) 3. Log-likelihood ratio exchange (LLR-E) 4. Symmetric TSEQ (S-TSEQ) 5. Transport block selection diversity (TBSD) 6. Coordinated scheduling with adaptive interference mitigation (CS-AIM) where JRFD, TSEQ, S-TSEQ, TBSD and CS-AIM are our main contributions in this paper, and quantify their relative performances via the post-processing signal-to-interference-plus-noise ratio distributions. We also compare the CoMP-specific front-haul rate requirements for all the schemes considered in this paper. Our results indicate that, with a linear minimum mean-square error receiver, the JRFD and TSEQ have identical performances, whereas S-TSEQ relaxes the front-haul latency requirements while approaching the performance of TSEQ. Furthermore, in a HetNet environment, we find that CS-AIM provides an attractive alternative to TBSD and LLR-E with a significantly reduced CoMP-specific front-haul rate requirement.

Analysis of mobile fronthaul bandwidth and wireless transmission performance in split-PHY processing architecture.

We analyze the mobile fronthaul (MFH) bandwidth and the wireless transmission performance in the split-PHY processing (SPP) architecture, which redefines the functional split of centralized/cloud RAN (C-RAN) while preserving high wireless coordinated multi-point (CoMP) transmission/reception performance. The SPP architecture splits the base stations (BS) functions between wireless channel coding/decoding and wireless modulation/demodulation, and employs its own CoMP joint transmission and reception schemes. Simulation results show that the SPP architecture reduces the MFH bandwidth by up to 97% from conventional C-RAN while matching the wireless bit error rate (BER) performance of conventional C-RAN in uplink joint reception with only 2-dB signal to noise ratio (SNR) penalty.

User Cooperation for 5G Wireless Access Networks

Device-to-device (D2D) connectivity is one of the main enablers for future fifth generation (5G) radio access networks. In this paper, we introduce a new model for user cooperation in 5G radio access networks termed frequency-selective soft forwarding (SF). SF is based on soft-processing by a target user equipment (TUE) of selectively forwarded soft information data by a set of cooperating user equipments acting as mobile relays towards the TUE. SF exploits the inherent frequency selectivity and broadcast nature of the downlink radio access channel for the sake of enabling efficient user cooperation and seamless integration of D2D connectivity into cellular radio access networks. Several variants of SF are investigated, including centralized and distributed approaches, thus offering various tradeoffs of performance versus signaling overhead cost. We also propose a hybrid cooperation mode selection strategy which leverages the performance benefits of SF and the low-overhead cost of decode-and-forward (DF) relaying to enhance the performance of 5G radio access networks. Exhaustive simulation results using a state-of-the-art long-term evolution-compliant link-level simulator show that the proposed user cooperation strategies well outperform baseline cooperation schemes relying on conventional DF and approach the performance of optimal joint reception with significantly lower cost in terms of D2D resource utilization and signaling overhead.

Coherent UDWDM PON with joint subcarrier reception at OLT.

In this contribution, we report on the experimental investigation of an ultra-dense wavelength-division multiplexing (UDWDM) upstream link with up to 700 × 2.488 Gb/s polarization-division multiplexing differential quadrature phase-shift keying parallel upstream user channels transmitted over 80 km of standard single-mode fiber. We discuss challenges of the digital signal processing in the optical line terminal arising from the joint reception of several upstream user channels. We present solutions for resource and cost-efficient realization of the required channel separation, matched filtering, down-conversion and decimation as well as realization of the clock recovery and polarization demultiplexing for each individual channel.

Theoretical Analysis of Overlay GNSS Receiver Effects

Having given a short overview of GNSS signals and state-of-the-art multi-band front-end architectures, this paper presents a novel contribution to efficient multi-band GNSS reception. A general overlay based front-end architecture is introduced that enables the joint reception of two signals broadcast in separate frequency bands, sharing just one common baseband stage. The consequences of this overlay are analyzed for both signal and noise components. Signal overlay is shown to have a negligible impact on signal quality. It is shown that the noise floor superposition results in non-negligible degradations. However, it is also demonstrated that these degradations can be minimized by judiciously setting the relative gain between the two signal paths. As an illustration, the analytical optimal path-control expression to combine overlaid signals in an ionospheric-free pseudorange is derived for both Cramér-Rao Lower Bound and practical code tracking parameters. Finally, some practical overlay receiver and path control aspects are discussed.

The Ecumenical and Patriotic Activity of the Estonian Eparchy in the Context of Soviet Politics of Religion in 1954–1964

AbstractThe post-Stalinist decade resulted in a temporary liberalization in Soviet religious policy in 1956–1957, followed by an intensification of administrative suppression of religious life during the years 1958–1964. A close evaluation of archival sources reveals the quiet two-faced tendencies of Soviet religious policies vis-a-vis the Orthodox Church of occupied Estonia: on one hand, the dozens of orthodox congregations at the local level were forcibly liquidated and the number of clerics decreased rapidly; on the other hand, the patriotic and ecumenical activities of the administration of the Estonian Eparchy increased dramatically and achieved its “golden era” during the tenure of its new bishop of Tallinn, Aleksii Ridiger (the future patriarch Aleksii II of Moscow). This study describes in detail the gradual increase in the interference of Soviet propaganda with the ecumenical and patriotic activity of the Estonian Eparchy from 1959. In the course of subsequent restrictions and the persecution of religion under Khrushchev, the Estonian Diocese of the Moscow Patriarchate was integrated into the larger scheme of Soviet peace propaganda and ecumenical cooperation. This took the form mainly of the joint reception of foreign church delegations which coincided with the tenure of Bishop Aleksii, who played a big role in the Moscow hierarchy as well as in the external affairs of the Russian Orthodox Church. Visits of Church delegations in Tallinn and Kuremäe monastery became a kind of “show piece” of religious freedom and played their part in Soviet peace propaganda. In conclusion, the rise and ebb of the patriotic and ecumenical activity of the Orthodox diocese in occupied Estonia were influenced by the changes, which took place among the USSR's highest authorities in the religious policies level and by the transition from Stalinist totalitarian dictatorship toward Nikita Khrushchev's more oligarchical system.

Costello syndrome community mourns New Zealand pediatrician

Costello syndrome community mourns New Zealand pediatrician

Special Presentation: Walling Receives 2008 Hydrologic Sciences Award

Desmond E. Walling was formally presented with the 2008 Hydrologic Sciences Award at the Atmospheric Sciences, Biogeosciences, and Hydrology joint reception during the 2009 Joint Assembly, held 24–27 May 2009 in Toronto, Ontario, Canada. The award is for outstanding contributions to the science of hydrology.

Standardization, innovation and deployment of electronic referral software in Norway

The introduction of electronic referrals in Norway started in 1996, when the first standard for an electronic referral was developed. Subsequent implementations of electronic health record (EHR) systems have been tested by a national testing and approval service. Almost all the Norwegian EHR systems comply with the recommended standards, but the volume of electronic referrals remains low: only 8200 referrals were sent electronically in September 2007. In comparison, 125,000 electronic discharge summaries were sent during the same month. There are four elements that need to be in place before smooth communication can occur between the EHRs of the hospitals and the general practitioners. First, the regional health authorities must have a strategy for electronic cooperation. Second, various technical problems must be solved. Third, certain organizational problems must be addressed. Finally, electronic referrals should be used to support enhanced work processes and joint reception for referrals should be considered at larger hospitals.

Association of Latina and Latino Anthropologists

•ALLA Election Results •ALLA Sessions and Events in DC •Business Meetings •Multiple Section Joint Reception •Number of ALLA Sessions in DC •Alert Regarding ALLA Sessions

Analytical modeling of joint reception, staging, onward movement, and integration

We present a stochastic model for the performance evaluation of a key phase in the military deployment process, joint reception, staging, onward movement, and integration (JRSOI). The process is modeled as an open, multiclass queueing network, wherein personnel and various classes of cargo are modeled as the flow entities and the phases of the process constitute individual queueing stations. We present low and high resolution models that provide a quick look at key aggregate performance measures such as system throughput and closure.

On the Expressive Power of Joint Input

The join-calculus was introduced as an ‘extended subset’ of the asynchronous π-calculus by amalgamating the three operators for input, restriction, and replication into a single operator, called definition, but with the additional capability to describe the atomic joint reception of values from two different channels. In this paper, we just extend the asynchronous π-calculus with joint input. By studying its expressive power, using slight variations of previously investigated choice encodings, we also conclude on the expressiveness of the join-calculus.