Downlink Performance Analysis of Full-Rate STCs in 2?2 MIMO WiMAX Systems

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Executive Summary

MIMO techniques play a key role in the current wireless specifications including IEEE 802.11n, IEEE 802.16e, and LTE. Indeed, Spatial Multiplexing (SM) and Alamouti code are already in use in WiMAX systems based on IEEE 802.16e specifications. But more efficient full-diversity full-rate codes, such as Golden code, are still under discussion and have been proposed for future evolutions of the standards. However, the Maximum Likelihood (ML) or ML-like decoding of these codes is still not feasible for practical implementation. Existing papers include performance comparisons of such complex codes limited to simple scenarios and their performances in a real WiMAX environment have not been discussed in detail.

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