http://worldcat.org/entity/work/id/24676700

Frequency sub-carrier based adaptive technique for OFDM systems with antenna arrays

Orthogonal frequency division multiplexing (OFDM) is gaining considerable attention and is a viable candidate in future broadband wireless communication systems. However as more devices become wireless in a limited frequency environment, high powered co-channel interference suppression techniques become increasingly important. In this regard adaptive arrays have been incorporated into OFDM schemes to further increase capacity and-robustness of the overall system. We introduce here a new method to extend spatial processing techniques to mitigate high powered co-channel interference in an orthogonal frequency division multiplexing system. The proposed algorithm uses optimal weights determined from classical methods, and known frequency information, to formulate adaptive weights specific to each sub-carrier. Performance improvements are investigated through computer simulations. These simulations in near-far scenarios illustrates the importance of such a technique.

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