Cooperative relaying in multi-antenna fixed relay networks
Space, cost, and signal processing constraints, among others, often preclude the use of multiple antennas at wireless terminals. This paper investigates distributed decodeand-forward fixed relays (infrastructure-based relaying) which are engaged in cooperation in a two-hop wireless network as a means of removing the burden of multiple antennas on wireless terminals. In contrast to mobile terminals, the deployment of a small number of antennas on infrastructure-based fixed relays is feasible, thus, the paper examines the impact of multiple antennas on the performance of the distributed cooperative fixed relays. Threshold-based maximal ratio combining (MRC) and thresholdbased selection combining (SC) of these multiple antenna signals are studied and analyzed. It is found that the end-to-end (E2E) error performance of a network which has few relays with many antennas is not significantly worse than that which has many relays each with a fewer antennas. Obviously, the former network has a tremendous deployment cost advantage over the latter. It is also observed that the E2E error performance of a network in which the multiple antennas at relays are configured in SC fashion is not significantly worse than that in which MRC is used. For implementation, SC presents a significantly lower complexity and cost than a full-blown MRC. The analysis in this paper uses the versatile Nakagami fading channels in contrast to the Rayleigh model used in most previous works.
|Keywords||Cooperative diversity, Fading channels, Fixed wireless relays, Multiple antennas, Selection combining, Threshold maximal ratio combining|
|Journal||IEEE Transactions on Wireless Communications|
Adinoyi, A. (Abdulkareem), & Yanikomeroglu, H. (2007). Cooperative relaying in multi-antenna fixed relay networks. IEEE Transactions on Wireless Communications, 6(2), 533–544. doi:10.1109/TWC.2007.05227