Multiple-Symbol Differential Sphere Detection aided successive relaying in the cooperative DS-CDMA uplink

Abstract

Abstract-The conventional amplify-and-forward cooperative system is capable of achieving a superior performance with the aid of MultipleSymbol Differential Sphere Detection (MSDSD), when compared to conventional differential detection (CDD) for transmission over timeselective channels. However, the conventional broadcast/cooperative twinphase based relaying protocol encounters a 50% throughput loss imposed by half-duplex relaying. For combating this problem, in this paper, we create a MSDSD aided successive relaying based cooperative DS-CDMA system. We demonstrate that given the target BER of 10 −4 , a diversity gain of up to 10 dB is achieved over the benchmark schemes employed without a throughput loss.

Non-Coherent Successive Relaying and Cooperation: Principles, Designs, and Applications

“…678 Correspondingly, the relay-aided MSDSD of [69] and [70] was 679 devised, which can be readily applied to various cooperative 680 networks having an arbitrary number of RN induced propa-681 gation paths. This is achieved without any BER performance 682 degradation with respect to multiple-path MSDSD [67], [68].…”

“…64 The germination of the basic idea of cooperative commu- 65 nication can be traced back to the concept of the relay chan- 66 nel, which was devised by Van der Meulen in [9] and was 67 later characterized from an information-theoretic perspective 68 by Cover and El Gamal in [10]. Basic relaying protocols were 69 also proposed in [10]. To elaborate a little further, cooperative 70 communications benefits from the broadcast nature of wireless 71 transmitters, which allows the relays to receive and retransmit 72 all signals, leading to the concept of "cooperative diversity".…”

“…By 305 contrast, Leib et al [55] and Edbauer [56] proposed sim-306 ple decision-feedback aided differential detection (DF-DD) 307 techniques, which achieve an equally competitive performance 308 at a low computational complexity. Later, Adachi et al [57] Motivated by [67] and [68], the single-user/single-path MSDSD 358 algorithm of [62] was further developed into a novel relay-aided 359 form in [69]. Compared to [67] and [68], the relay-aided MS-360 DSD scheme of [69] further mitigates the system's complexity 361 and exhibits an increased flexibility in terms of adapting to 362 3 Hence, in the perspective of achievable BER performance, we categorize DF-DD into sub-optimum MSDD in Fig.…”

“…3. Evolution of the multiple-symbol differential detectors: CDD [74], MSDD [53], [73], Fast-MSDD [54], DF-DD [57], [60], Fano-MSDD [63], MSDSD [62], SISO-MSDSD [66], Multiple-path MSDSD [67], Relay-aided MSDSD [69], [70].…”

“…Based on the above brief review of NC detection techniques, 371 in view of their benefits in obviating the need for channel es-372 timation and in overcoming the problem that we cannot expect 373 the mobile relays to estimate the source-to-relay channels, we 374 advocate the family of NC detection techniques, especially the 375 MSDSD algorithms of [62] and [66] as well as their relay-376 aided MSDSD variants [69], [70] as the detection strategy to 377 be used for successive relaying aided cooperative networking. 378 Hence, in the rest of this treatise, we focus our discussions on 379 advanced non-coherent successive relaying (NC-SR).…”