Massive Access with Full Channel State Information

In this chapter, we consider a scenario where the wireless devices in the cellular IoT are fixed, such that CSI keeps unchanged during a relatively long time and the BS is capable of obtaining full CSI. In such a scenario, the benefits of spatial DoF offered by the multiple-antenna BS are exploited to support massive access. In particular, transmit beams and powers are jointly optimized to mitigate the intra-cluster and inter-cluster interference, so as to improve the overall performance. Specifically, we design the joint optimization algorithms from the perspectives of maximizing the weighted sum rate and minimizing the total power consumption, respectively. Moreover, in order to reduce the computational complexity, we design the massive access algorithms with ZF beamforming fixedly. Simulation results show that the proposed algorithms can achieve obvious performance gain over the baseline algorithms. Especially, the proposed algorithms are able to alleviate the impact of imperfect SIC on the performance of massive access.

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