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Adaptive Modulation and Space-Time Coding Scheme Based on Constellation-Constrained Capacity

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3 Author(s)
Li Xu ; Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei, China ; Jinkang Zhu ; Ling Qiu

Adaptive modulation is one of key technologies in wireless communication systems. The modulation order can be adaptively adjusted via different space-time coding under constrained transmission rate. Constellation-constrained capacity of different modulations under the constrained transmission rate and the adaptive modulation and space-time coding(AM-STC) scheme are analyzed in this paper. Analysis suggests that lower modulation satisfying the transmission rate can get higher spectrum efficiency at high SNRs and the simulations show that the AM-STC scheme is helpful to select the best modulation at low SNRs. Moreover, the simulation results are reasonable agreement with the results of theoretical analysis.

Published in:

Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd

Date of Conference:

6-9 Sept. 2010