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Low Complexity Detection for UTRA-TDD Receivers
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/03/01
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Applications and Implementations of Digital Signal Processing)
Category: Communication Theory and Systems
UTRA-TDD, TD-CDMA, MMSE, FFT,
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In this paper we present the successful application of Prime Factor Algorithm FFT (Fast Fourier Transform) and pruning techniques to achieve low complexity UTRA-TDD detection. This approach has been applied to the Minimum Mean Square Error-Block Linear Equalizer (MMSE-BLE) receiver and to an MMSE equalizer specially designed for the downlink after their proper reformulation in the frequency domain. A complexity reduction of nearly 50% with respect to the classical 2n length FFT solutions has been demonstrated, without any performance loss. A more parallelizable VLSI architecture can be derived thanks to the modularity of the introduced FFT algorithms. Performances comparison has been carried out to confirm the validity of the proposed methods.