Compress-and-Forward Relaying Over Parallel Gaussian Channels

Chang, Won; Kotagiri, Shivaprasad; Laneman, J. Nicholas; Chung, Sae-Young; Lee, Y.H.

doi:10.1109/camsap.2007.4498026

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Based on [ 26 ], the practical EF can be divided into two categories. The first category implements EF relaying protocol by using Wyner-Ziv code at the relay [ 27 , 28 , 29 , 30 ], while the second category consists of works that consider the issues related to relaying quantization as a separate problem [ 26 , 31 , 32 ]. In summary, to achieve theoretical gains depicted by the proposed method, further research is needed to address the challenges in these three above-mentioned areas.…”

Section: Analytical Resultsmentioning

confidence: 99%

Multiple Access-Enabled Relaying with Piece-Wise and Forward NOMA: Rate Optimization under Reliability Constraints

Khodakhah

Mahmood

Österberg

et al. 2021

Sensors

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The increasing proliferation of Internet-of-things (IoT) networks in a given space requires exploring various communication solutions (e.g., cooperative relaying, non-orthogonal multiple access, spectrum sharing) jointly to increase the performance of coexisting IoT systems. However, the design complexity of such a system increases, especially under the constraints of performance targets. In this respect, this paper studies multiple-access enabled relaying by a lower-priority secondary system, which cooperatively relays the incoming information to the primary users and simultaneously transmits its own data. We consider that the direct link between the primary transmitter–receiver pair uses orthogonal multiple access in the first phase. In the second phase, a secondary transmitter adopts a relaying strategy to support the direct link while it uses non-orthogonal multiple access (NOMA) to serve the secondary receiver. As a relaying scheme, we propose a piece-wise and forward (PF) relay protocol, which, depending on the absolute value of the received primary signal, acts similar to decode-and-forward (DF) and amplify-and-forward (AF) schemes in high and low signal-to-noise ratio (SNR), respectively. By doing so, PF achieves the best of these two relaying protocols using the adaptive threshold according to the transmitter-relay channel condition. Under PF-NOMA, first, we find the achievable rate region for primary and secondary receivers, and then we formulate an optimization problem to derive the optimal PF-NOMA time and power fraction that maximize the secondary rate subject to reliability constraints on both the primary and the secondary links. Our simulation results and analysis show that the PF-NOMA outperforms DF-NOMA and AF-NOMA-based relaying techniques in terms of achievable rate regions and rate-guaranteed relay locations.

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Section: Analytical Resultsmentioning

confidence: 99%

Multiple Access-Enabled Relaying with Piece-Wise and Forward NOMA: Rate Optimization under Reliability Constraints

Khodakhah

Mahmood

Österberg

et al. 2021

Sensors

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“…It is easy to see that the optimization problem described above is a non-convex one. The necessary conditions for the optimal solution using the Karush-Kuhn-Tucker (KKT) conditions are summarized in [24] and the solution is given below for completeness,…”

Section: B Power Allocation For Cfmentioning

confidence: 99%

“…Rayleigh fading model is investigated where each channel tap is a complex Gaussian random process, whose variances sum up to 1. Noise is colored Gaussian as defined in (24), with s = 0 and w = 10m/s. A total input power constraint of P t = 20 dB is considered for all the schemes.…”

Section: Statistical Channel Modelmentioning

confidence: 99%

Capacity Bounds for Relay Channels With Intersymbol Interference and Colored Gaussian Noise

Choudhuri

Mitra

2014

IEEE Trans. Inform. Theory

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The capacity of a relay channel with inter-symbol interference (ISI) and additive colored Gaussian noise is examined under an input power constraint. Prior results are used to show that the capacity of this channel can be computed by examining the circular degraded relay channel in the limit of infinite block length. The current work provides single letter expressions for the achievable rates with decodeand-forward (DF) and compress-and-forward (CF) processing employed at the relay. Additionally, the cut-set bound for the relay channel is generalized for the ISI/colored Gaussian noise scenario. All results hinge on showing the optimality of the decomposition of the relay channel with ISI/colored Gaussian noise into an equivalent collection of coupled parallel, scalar, memoryless relay channels. The region of optimality of the DF and CF achievable rates are also discussed. Optimal power allocation strategies are also discussed for the two lower bounds and the cut-set upper bound. As the maximizing power allocations for DF and CF appear to be intractable, the desired cost functions are modified and then optimized. The resulting rates are illustrated through the computation of numerical examples.Chiranjib Choudhuri (cchoudhu@usc.edu) and Urbashi Mitra (ubli@usc.edu) are with the Ming Hsieh

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“…그러나 이 방식은 벡터 양자화를 사용하므 로 연산 복잡도가 매우 높아 실제 통신 시스템에서 사용하기 어렵다. 이에 Wyner-Ziv 부호화의 연산 복잡도를 줄이기 위한 연구가 진행 중이다 [9][10][11][12] . 최 근에는 벡터 양자화 대신 연산량이 낮은 스칼라 양 자화를 사용하고도 시분할 반이중 EF 릴레이 시스 템의 달성 가능한 전송률을 높일 수 있는 실제적 기법이 제안되었다 [8] .…”

Section: 본 논문에서는 시분할 반이중 Ef 릴레이 시스템 의 동작을 위한 실제적인 릴레이 양자화 기법 및 송신국과 릴unclassified

Design of Time-Division Half-Duplex Estimate and Forward Relaying System

Hwang¹,

Kim²,

Lee³

2012

The Journal of Korea Information and Communications Society

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In this paper, we propose a practical time-division half-duplex Estimate and Forward (EF) relaying protocol.The conventional EF relaying protocol works well only when the relay node is near the destination node. The proposed EF relaying protocol, however, determines adaptively relay parameters such as the quantization level of relay node and the power allocation between source and relay nodes according to the channel conditions. By doing so, the proposed EF relaying protocol provides low probability of bit error even when the relay node is far from the destination node. Consequently, the proposed EF protocol is suitable for the mobile relay systems.It is shown by simulations that the proposed EF relaying protocol shows lower bit error rate for all relay positions than a conventional EF protocol.

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Compress-and-Forward Relaying Over Parallel Gaussian Channels

Cited by 7 publications

References 6 publications

Multiple Access-Enabled Relaying with Piece-Wise and Forward NOMA: Rate Optimization under Reliability Constraints

Multiple Access-Enabled Relaying with Piece-Wise and Forward NOMA: Rate Optimization under Reliability Constraints

Capacity Bounds for Relay Channels With Intersymbol Interference and Colored Gaussian Noise

Design of Time-Division Half-Duplex Estimate and Forward Relaying System

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