Signal detection method for low-complexity mimo-noma system based on improved gradient projection method
A technology of MIMO-NOMA and gradient projection method, which is applied in the field of wireless communication, can solve the problems of non-orthogonal signal interference and high computational complexity of signal detection methods, so as to speed up the convergence speed, improve signal detection performance, and reduce computational complexity Effect
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[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0028] The present invention provides a system environment uplink multi-user Grant-free MIMO-NOMA system model such as figure 1 shown.
[0029] First consider the uplink multi-user Grant-free MIMO-NOMA system. Suppose the base station is equipped with N r There are K single-antenna users in the cell. After channel coding and modulation, assemble from the complex constellation Get the sending symbol x of the kth user in k . Then, the symbol x that will be sent k Modulated to a spreading sequence s of length N k , satisfying N
[0030]
[0031] Among them, s mk is the propagation sequ...
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