A Novel Sparse Channel Estimation Method for Multiuser MIMO Systems

Recently, smart terminals are getting more and more popular. With massive users accessing to the communication network, traditional medium access control protocals lead to high control overhead and low efficiency of resource usage. A novel multiple access control (MAC) scheme was proposed in [1] without resource allocation for small packet services. In their work, the channel state information (CSI) was assumed to be perfectly obtained at the BS. In our work, we study the performance of the MAC scheme with imperfect CSI and derive the theoretical analysis of channel estimation. Simulation results show that the performance degradation is small. The gap between the perfect and the estimated CSI is less than 0.5 dB with no more than 100 pilot symbols, which is enough to fullfill the demand in the MAC scheme.