Graduate Thesis Or Dissertation
 

Computationally efficient block diagonalization for downlink multiuser MIMO-OFDM systems

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zp38wg072

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  • One of the key challenges in downlink multiuser multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is the mitigation of the multi-access interference when different users share the same subcarriers. In this work, the block diagonalization (BD) algorithm for inter-user interference pre-cancelation is extended to MIMO-OFDM systems. However, in the context of OFDM, the complexity of the algorithm grows proportionally to the number of OFDM subcarriers. To address this issue, the inherent frequency correlation between adjacent subcarriers is exploited. Simulations show that interpolation of the BD pre/decoding matrices provides a favorable tradeoff between complexity and performance. Specifically, a 50% reduction in computational load is achieved for less than 5% throughput loss and 1 dB error performance penalty at high SNR.
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file details ElAmraniSamia2011.pdf 2017-08-07 Público Descargar