User cooperation diversity-part II: implementation aspects and performance analysis

TLDR

The paper builds on a prior study that introduced a mobile‑user cooperation strategy for CDMA to achieve spatial diversity. The study extends the cooperation concept by examining practical implementation issues, including receiver design and performance evaluation. The authors analyze optimal and suboptimal receiver designs, evaluate conventional and high‑rate CDMA implementations, and study cooperation under relaxed transmitter CSI assumptions. Cooperation consistently improves system throughput, extends cell coverage, and reduces sensitivity to channel variations across all studied scenarios. Refer to Part I, ibid., pp.

Abstract

For pt.I see ibid., p.1927-38. This is the second of a two-part paper on a new form of spatial diversity, where diversity gains are achieved through the cooperation of mobile users. Part I described the user cooperation concept and proposed a cooperation strategy for a conventional code-division multiple-access (CDMA) system. Part II investigates the cooperation concept further and considers practical issues related to its implementation. In particular, we investigate the optimal and suboptimal receiver design, and present performance analysis for the conventional CDMA implementation proposed in Part I. We also consider a high-rate CDMA implementation and a cooperation strategy when assumptions about the channel state information at the transmitters are relaxed. We illustrate that, under all scenarios studied, cooperation is beneficial in terms of increasing system throughput and cell coverage, as well as decreasing sensitivity to channel variations.