Consider a parallel two-way relaying orthogonal frequency division multiple access (PTWR-OFDMA) scheme in which mobile terminals (MTs) are divided into near-nodes (NNs) and far-nodes (FNs). An NN communicates with the base station (BS) directly while an FN communicates indirectly via NNs. We study the design and analysis issues for PTWR-OFDMA. The scheme has some noticeable advantages. First, its throughput increases like XaK, much higher than that of lnlnK in conventional OFDMA (K being the number of MTs). Second, PTWR-OFDMA can provide much better fairness than conventional OFDMA. Third, the power overhead per NN reduces quickly when K increases if there is a peak rate limitation, implying that there is no strong incentive for some users to avoid providing relaying.

Parallel two-way relaying in cooperative OFDMA cellular systems

Wireless communication has been rapidly developed in recent years acquiring higher demand of efficient wireless systems. Cooperative communication is considered to be capable of effectively meeting this rapid growth where the use of relays improves the throughput and ensures successful transmission to all terminals in a given system. In this paper, a Two-way Decode and Forward Relaying for orthogonal frequency division multiple access (OFDMA) mobile systems (TWR-DF-oFdMA) is proposed. The system consists of mobile terminals (MTs) divided into near nodes and far nodes in which the base station directly transmits to the near nodes and indirectly transmits to the far nodes by the cooperation of the near nodes which act as relays. The performance of the system is measured in terms of the bit error rate and the sum rate. It is found that the performance of TWR-DF-OFDMA is much better than that of conventional OFDMA. Furthermore, it is shown that the number of NNs in the system affects the performance of TWR-DF-OFDMA and an optimum number was found to give the highest performance of TWR-DF-OFDMA compared to conventional OFDMA.

Two-Way decode and forward relaying for OFDMA mobile systems

A transmitter includes a mapping circuit and a framing circuit The mapping circuit is configured to combine and map a first data sequence and a second data sequence onto orthogonal frequency division multiplexing (OFDM) subcarriers which include first subcarriers and second subcarriers The framing circuit is configured to generate an OFDM signal from the OFDM subcarriers The mapping circuit is configured to: map first data included in the first data sequence and second data included in the second data sequence onto the first subcarriers; and map the second data onto the second subcarriers The first data are not mapped on the second subcarriers

Transmitter, receiver, transmitting method, and receiving method

Wireless communication has become widely used in recent years acquiring higher demand of efficient wireless systems effectively competing various wireless complications. Cooperative communication is thought as one method to compete the effects of fading and enhancing the throughput of wireless transmission where the use of relay nodes randomly distributed introduces a rich spatial diversity to accomplish a better system performance and improve the coverage for the users near the edge of the cell. In this paper, a Two-way Decode and Forward Relaying for orthogonal frequency division multiple access (OFDMA) mobile systems (TWR-DF-OFDMA) is proposed. The system consists of mobile terminals (MTs) divided into near nodes and far nodes in which the base station directly transmits to the near nodes and indirectly transmits to the far nodes by the cooperation of the near nodes which act as relays. A multi relay selection scheme is proposed in which NNs with the best channel conditions are chosen for a particular FN. Another scheme is further proposed in which MTs are classified into near nodes, far nodes, and direct nodes. The effect of channel estimation error on the performance of the proposed scheme is investigated. The performance of the system is measured in terms of the bit error rate and the sum rate. It is found that the performance of TWR-DF-OFDMA is much better than that of direct transmission case. Furthermore, it is shown that the number of NNs in the system affects the performance of TWR-DF-OFDMA and an optimum number was found to give the highest performance of TWR-DF-OFDMA compared to direct transmission case.

Two-Way DF Relaying for OFDMA System

We consider a parallel two-way relaying orthogonal frequency division multiple access (PTWR-OFDMA) scheme based on analog network coding in which mobile terminals (MTs) are divided into near-nodes (NNs) and far-nodes (FNs). An NN communicates with the base station (BS) directly while an FN communicates indirectly via the assistance of NNs. We study the design and analysis issues for PTWR-OFDMA. The proposed scheme has some noticeable advantages. First, the throughput of PTWR-OFDMA increases like $\ln K$ , much higher than that of $\ln\ln K$ in conventional OFDMA ( $K$ is the number of MTs). Second, PTWR-OFDMA can provide much better fairness than conventional OFDMA. Third, the power overhead per NN reduces quickly when $K$ increases if there is a peak rate limitation, implying that there is no strong incentive for some users to avoid providing relaying.

Parallel Two-Way Relaying in Cooperative OFDMA Cellular Systems

An amplify-and-forward method for two-way relay OFDM systems is investigated, assuming that the channel state information (CSI) is known at all nodes Power allocation and interleaving operations are performed to maximize the sum-rate of the system A low-cost partitioning and mapping scheme is proposed for the interleaver design problem Simulation results show that the proposed scheme can achieve near-optimal performance with significantly reduced complexity

Low-Cost Interleaver Design for Two-Way Relay OFDM Systems

The acquisition of accurate channel state information at the transmitter (CSIT) is a difficult task in multiple-input multiple-output (MIMO) systems. Partial CSIT is a more realistic assumption, especially for high-mobility mobile users (MUs) whose channel varies very rapidly. In this letter, we propose a MIMO two-way relaying (MTWR) scheme, in which the communication between the BS and a high-mobility MU is assisted by other low-mobility MUs serving as relays. This produces a beamforming effect that can significantly improve the performance of the high-mobility MU, especially for a large number of MUs and unreliable CSIT. key words: two-way relay, MIMO, partial CSIT

A Two-Way Relay Scheme for Multi-User MIMO Systems with Partial CSIT

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Papers

Parallel Two-Way Relaying in Cooperative OFDMA Cellular Systems

Parallel two-way relaying in cooperative OFDMA cellular systems

Low-Cost Interleaver Design for Two-Way Relay OFDM Systems

A Two-Way Relay Scheme for Multi-User MIMO Systems with Partial CSIT