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 language | English |
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Pages (from-to) | 305-314 |
Number of pages | 10 |
Journal | Journal of Network and Computer Applications |
Volume | 46 |
DOIs | |
Publication status | Published - 8 Dec 2014 |
Externally published | Yes |
Keywords
- Cooperative communications
- Mobility
- Multiple helpers
- Relay selection
- Stochastic geometry
- Wireless diversity