Performance analysis and enhancement for a cooperative wireless diversity network with spatially random mobile helpers

Peijian Ju, Wei Song*, A. Long Jin, Dizhi Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In many studies on wireless cooperative diversity, it is often assumed that the number of helpers and their locations are deterministic or known a priori. In this paper, we relax such assumptions and investigate a wireless diversity system with distributed cooperation and spatially random helpers subject to random direction (RD) mobility. To enable opportunistic relaying with multiple helpers, we consider an ALOHA-like medium access control (MAC) scheme and a timer-based random backoff scheme for multi-helper coordination. Particularly, we analyze the upper bound of combined signal-to-noise ratio (SNR) and unconditional success probability with multi-helper cooperation. We also provide numerical approximations for the delay of the two MAC schemes. To characterize the tradeoff between the success probability and delay, we further define a success/delay ratio, which can be maximized by adapting the intensity of selected helpers. The numerical and simulation results validated the analysis accuracy and demonstrated insightful observations.

Original languageEnglish
Pages (from-to)305-314
Number of pages10
JournalJournal of Network and Computer Applications
Volume46
DOIs
Publication statusPublished - 8 Dec 2014
Externally publishedYes

Keywords

  • Cooperative communications
  • Mobility
  • Multiple helpers
  • Relay selection
  • Stochastic geometry
  • Wireless diversity

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