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Performance analysis of ultra dense network with linear reception and successive interference cancellation under limited backhaul

Ultra-dense network (UDN) is considered to be a promising solution to improve network throughput of future radio access networks. In this paper, we investigate the performance limits of ultra dense cloud access network under limited backhaul. Lower bounds of the average per-user rate are derived for linear reception without and with successive interference cancellation (SIC). Then we discuss how the average per-user rate is impacted by the number of cooperating base stations (BSs), signal to noise ratio (SNR) and the backhaul capacity. The results show that the performances of MMSE detector with SIC and ZF detector with SIC are close at high SNR and large backhaul capacity. And the average per-user rate for the ZF detector with SIC is within log2 e bits per channel use of the large backhaul capacity. Numerical results demonstrate that our asymptotic rate bounds are tight when the number of cooperating BSs grows large.