Diversity Relaying with Spatially Random Mobile Relays

  • Wei Song
  • Peijian Ju
  • A-Long Jin
Part of the Wireless Networks book series (WN)


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 chapter, 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.


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Wei Song
    • 1
  • Peijian Ju
    • 2
  • A-Long Jin
    • 3
  1. 1.Faculty of Computer ScienceUniversity of New BrunswickFrederictonCanada
  2. 2.IBM CanadaFrederictonCanada
  3. 3.University of WaterlooWaterlooCanada

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