A Simple Constellation Precoding Technique over MIMO-OFDM Systems

This paper studies the design of a simple constellation precoding for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system over Rayleigh fading channels where OFDM is used to keep the diversity replicas orthogonal and reduce ISI effects. A multi-user environment with K synchronous co-channel users is considered. The proposed scheme provides a bandwidth efficient transmission for individual users by increasing the system throughput. In comparison with the existing coded MIMO-OFDM schemes, the precoding technique is designed under the consideration of its low implementation complexity while providing a comparable error performance to the existing schemes. Analytic and simulation results have been presented to show the distinguished error performance.

Authors:

• Fuh-Hsin Hwang
• Tsui-Tsai Lin
• Chih-Wen Chan
• Cheng-Yuan Chang

Keywords:

• coded modulation
• diversity technique
• OFDM
• MIMO
• constellation precoding

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