Two-User Cooperative Transmission Using Superposition Modulation and Soft Information Combining

Abstract

Abstract-We propose a cooperative transmission scheme for two users with one common relay using superposition modulation. It uses distributed Turbo codes (DTCs) for each user. The relay always decodes, then interleaves and re-encodes the decoded data. A new packet is formed by combining the re-encoded packets from both users using superposition modulation. This packet is forwarded to the destination with the average receive SNRs of each user. The destination uses the cooperative Turbo decoder of [1] to improve performance. Simulation results show the proposed scheme outperforms XOR based schemes and is simple to implement.

Cooperative multicasting based on superposition and layered coding

“…To analyse the average number of bits in (19), we may define A as in [24]. We calculate the term A as follows…”

“…Utilising superposition and cooperative relaying for unicast transmission is investigated in [11,[17][18][19][20][21] to enhance average network throughput. Although several strategies have been proposed for multicast transmission, there are pitfalls that need to be investigated.…”

Cooperative quadrature physical layer network coding in wireless relay networks

“…In [20], the authors introduced a cooperative transmission scheme in which the relay node combined the re-encoded information from the two users using superposition modulation and transmitted it to the destination node. Since the relay node combines the re-encoded information, the scheme in [20] can save the time slots required during the relay phase compared with [19]. However, during the source nodes broadcast phase, the source nodes still broadcast their information using different time slots which leads to time slots wasted.…”