Labeling optimization of differential unitary space-time modulation

Authors:
Liu Jun;Wang Gang;Liu Shuai;Zhou Zhihua
Affiliations:
Communication Research Centre, Harbin Institute of Technology, Harbin, China;Communication Research Centre, Harbin Institute of Technology, Harbin, China;Communication Research Centre, Harbin Institute of Technology, Harbin, China;Communication Research Centre, Harbin Institute of Technology, Harbin, China
Venue:
CAR'10 Proceedings of the 2nd international Asia conference on Informatics in control, automation and robotics - Volume 2
Year:
2010

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Abstract

For differential unitary space-time modulation (DUSTM), the bit-error performance is affected by the type of labeling. In this paper, we used the Binary Switching Algorithm (BSA) to optimize the labeling of cyclic constructed DUSTM constellation. Instead of time-consuming simulation, we constructed an easily-calculated cost function to estimate the impact of different types of labeling on the bit-error performance for DUSTM. And we proposed a simple and effective rule to construct the initial labeling for the application of BSA to DUSTM. Simulation results show that for DUSTM, the optimized labeling outperforms the regular labeling significantly for low SNR, and the proposed method of optimizing the initial labeling improves the performance of the traditional BSA.