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# Optimization framework and graph-based approach for relay-assisted bidirectional OFDMA cellular networks

IEEE Transactions on Wireless Communications, no. 11 (2010): 3490-3500

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摘要

This paper considers a relay-assisted bidirectional cellular network where the base station (BS) communicates with each mobile station (MS) using orthogonal frequency-division multiple-access (OFDMA) for both uplink and downlink. The goal is to improve the overall system performance by exploring the full potential of the network in variou...更多

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简介

- In wireless cellular networks, deploying a set of relay stations (RSs) between a base station (BS) and mobile stations (MSs) is a cost-effective approach for improving system performance, such as coverage extension, power saving and cell-edge throughput enhancement
- These advantages are achieved as relay-assisted cooperative transmission exploits the inherent broadcast nature of wireless radio waves and provides cooperative diversity [1]–[3].
- It is attractive to utilize network coding gain in the form of two-way relaying for more efficient transmission of downlink and uplink traffic in a cooperative cellular network

重点内容

- The small-scale fading is modeled by Rayleigh fading process, where the power delay profile is exponentially decaying with maximum delay spread of 5 μs and maximum Doppler spread of 30 Hz
- In this paper, we proposed a novel three-time-slot time-division duplexing transmission protocol for supporting direct transmission, one- and two-way relaying in relay-assisted bidirectional cellular orthogonal frequency-division multiple-access networks
- After establishing its equivalence to a maximum weighted clique problem in graph theory, we employed an any colony optimization based heuristic algorithm to find the solution in polynomial time
- About 20-30% improvement on the system average throughput is achieved over the conventional orthogonal frequency-division multiple-access networks without relay
- DF relay strategy is practically better than AF strategy under the proposed transmission protocol

结果

- The authors evaluate the performance of the proposed transmission protocol together with the ACO based resource allocation algorithm using simulation.
- The small-scale fading is modeled by Rayleigh fading process, where the power delay profile is exponentially decaying with maximum delay spread of 5 μs and maximum Doppler spread of 30 Hz. A total of 2000 different channel realizations were used.
- All RSs have the same maximum power constraints, so do all MSs. The authors consider that the maximum power constraints in dB at BS, RS and MS satisfy PB = PR + 3dB = PM + 5dB.
- The graph settings in the ACO algorithm are listed in Table II, which have been proved to be efficient in [23]

结论

- The authors proposed a novel three-time-slot TDD transmission protocol for supporting direct transmission, one- and two-way relaying in relay-assisted bidirectional cellular OFDMA networks.
- Under this protocol, a complete set of five transmission modes are introduced.
- DF relay strategy is practically better than AF strategy under the proposed transmission protocol

- Table1: TRANSMISSION MODE PAIRING
- Table2: GRAPHICAL SETTINGS

引用论文

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