Transmit Signal Designs for Spatial Modulation With Analog Phase Shifters - 2018


In this Project, we study transmit codebook styles for spatial modulation with analog phase shifters. The proposed spatial modulation with analog phase shifters will send more spatial symbols than typical spatial modulation, whereas reserving the low complexity of single RF-chain MIMO structure. The main idea is to transmit Nt different part-shifted copies of a digitally modulated signal through Nt transmit antennas. In each time slot, the transmitted info bits are divided into two teams. The primary cluster of the bits is mapped to the digitally modulated signal symbol. The second cluster of the bits is mapped to the spatial image, that determines the phase shift of each antenna. The transmit signal designs are allotted in open loop and closed loop eventualities, respectively. In open loop state of affairs, the transmit codebook is designed in 2 steps, i.e., generate the optimal spatial codebook in step with Grassmannian line packing criterion, and realize the optimal tradeoff between the cardinality of spatial codebook and therefore the modulation order of signal image. Within the closed loop scenario, the transmit codebook is meant consistent with the structure of Huffman tree. Intensive simulation results are given to validate the effectiveness of the proposed scheme in open loop scenario and close loop scenario, respectively.

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