Large-system-based performance analysis and design of multiuser cooperative networks
IEEE Transactions on Signal Processing
Multiuser detection for cooperative networks and performance analysis
IEEE Transactions on Signal Processing
The performance of multi-user cooperative diversity in an asynchronous CDMA uplink
IEEE Transactions on Wireless Communications - Part 2
Large system performance of linear multiuser receivers in multipath fading channels
IEEE Transactions on Information Theory
MMSE analysis of certain large isometric random precoded systems
IEEE Transactions on Information Theory
Achieving Wireline Random Access Throughput in Wireless Networking Via User Cooperation
IEEE Transactions on Information Theory
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The performance of a cooperative multiuser direct-sequence code-division multiple-access (DS-CDMA) system is analyzed in the asymptotic regime where both the spreading codes and the number of users grow large with the same ratio. A simple signal-to-interference-plus-noise ratio (SINR) expression is derived that is independent from the spreading codes and explicitly accounts for the effects of the multiple-access interference (MAI) and the relay noise. The so-obtained SINR expression is then computed based entirely on the available local information. The results obtained above are then used to optimally design the cooperative system. In particular, it is shown how the amount of cooperation between each collaborating pair can be adjusted to simultaneously achieve a preassigned target SINR for both users. Based on the local information, the globally optimal amount of the relay power is also obtained that maximizes the achieved SINR at the access point.