Abstract
Two-way relaying channel (TWRC) improves the throughput of one-way relaying channel through network coding at the relay. Time division broadcast (TDBC) is one typical protocol for TWRC, but with three time slots for one round information exchange leading to throughput loss. To enhance throughput performance, incremental redundancy transmission is usually incorporated into TDBC (i.e., TDBC-IR) by one bit feedback, indicating the successful or failed transmission. Nevertheless, TDBC-IR still suffers in throughput since it cannot fully exploit and adapt to the varying channel dynamics. In the paper, we propose a dynamic TDBC protocol with incremental redundancy in the form of rateless coding (i.e., DTDBC-RC) to fully utilizing the varying channel dynamics. In DTDBC-RC, the two sources first transmit in rateless coding way with given maximum allowable transmission time, and then the relay retransmits or not based on its decoding results. To reveal the advantages of DTDBC-RC, we analyze its performance comprehensively in terms of outage probability, expected rate, and diversity-multiplexing trade-off (DMT). We also present a subslot realization scheme for DTDBC-RC (i.e., sub-DTDBC-RC) since the DMT of DTDBC-RC cannot be obtained directly. Simulation and numerical results show the performance advantage of DTDBC-RC (or sub-DTDBC-RC) over TDBC-IR in terms of both expected rate and DMT.
Highlights
Two-way relaying is an efficient way to improve the throughput performance of conventional one-way cooperative communications with half-duplex relay [1], where two sources exchange information with the aid of a relay
We focus on two-way relaying channel with direct link between the two sources and the Time division broadcast (TDBC) protocol, and aim to improve its throughput
incremental redundancy (IR) can improve throughput, we argue that TDBC-IR is not the best way since fixed two or three time slots are still entailed, leading to underutilizing good channel conditions
Summary
Two-way relaying is an efficient way to improve the throughput performance of conventional one-way cooperative communications with half-duplex relay [1], where two sources exchange information with the aid of a relay Two-way relaying is proposed with network coding at R, where both S1 and S2 transmit simultaneously to R, R network-encodes the information received for S1 and S2 (e.g., through bit level XOR operation) and broadcasts to them, with less time slots.). We focus on two-way relaying channel with direct link between the two sources (often encountered in many practical applications) and the TDBC protocol, and aim to improve its throughput. IR can improve throughput, we argue that TDBC-IR is not the best way since fixed two or three time slots are still entailed, leading to underutilizing good channel conditions (or unable to adapt to the varying channel dynamics). To reveal the advantages of DTDBC-RC, we analyze its performance comprehensively in terms of outage probability, expected rate, and diversity-multiplexing trade-off (DMT).
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