Joint network‐channel coding for the multiple‐access relay channel based on turbo codes

Abstract

SUMMARYWe consider the time-division multiple-access relay channel (MARC) with block-fading channels and Gaussian noise, where two sources communicate with one destination with the help of one relay. Such a system can be used for the cooperative uplink of two mobile stations to a base station with the help of a relay. We propose a joint network-channel code design based on turbo codes for the MARC. We compare the proposed system with a distributed turbo code for the time-division relay channel and with a system which uses separate network-channel coding for the MARC. Our results show that the proposed code can gain diversity compared to the system for the time-division relay channel and allows to more efficiently exploit the redundancy in the transmission of the relay than separate network-channel coding.

Joint channel-and-network coding using EXIT chart aided relay activation

“…In [5], a simple triangular topology conceived for two-user cooperation was combined with beneficial channel codes. As further advances, two-way relay channels (TWRC) and multiple-access relay channels (MARC) were investigated in [6] and [7], respectively, where a turbo-like code was constituted for transmissions over the TWRC and MARC in order to achieve a high diversity gain.…”

“…As a benefit of the network coding, the above-mentioned half duplex multiplexing loss is mitigated without sacrificing the diversity gain. The designs of joint channel-and-network (JCN) codes and their iterative detection have been investigated in [5]- [7]. In [5], a simple triangular topology conceived for two-user cooperation was combined with beneficial channel codes.…”

“…In [5], a simple triangular topology conceived for two-user cooperation was combined with beneficial channel codes. As further advances, two-way relay channels (TWRC) and multiple-access relay channels (MARC) were investigated in [6] and [7], respectively, where a turbo-like code was constituted for transmissions over the TWRC and MARC in order to achieve a high diversity gain.The primary focus of this paper is on finding beneficial relay activation criteria for a simple triangular topology. In sophisticated JCN coded systems, extrinsic information transfer (EXIT) chart analysis may be involved for visualizing the convergence behavior of the iterative detection scheme [8], [9].…”

Non-binary joint network-channel decoding of correlated sensor data in wireless sensor networks

“…Hausl et al first proposed a joint network-channel decoding technique for multi-access and two-way relay channels, and presented an iterative network and channel decoding framework that operates on the Tanner graph of the LDPC code [12], [13]. Bao and Li proposed adaptive network coded cooperation using multiple transmitters to send data to a common receiver through an inherently unreliable and constantly changing channel [14].…”

Physical-Layer Algebraic Network Coding and Superposition Coding for the Multi-Source Cooperation Aided Uplink

“…Apart from the original network-layer applications, it has recently been recognized that the physical-layer of wireless networks also benefits from NC. The concept of joint channel coding and network coding was proposed in the context of the classic twoway relay channel [11] and the multiple access relay channel [12], where the concept of distributed channel codes was generalised and the redundancy inherent in the network code was exploited in order to support channel decoding. The employment of network coding was proposed for a two-user cooperation-aided scenario in [13], [14], where a promising performance was observed.…”