In this paper, we propose a novel approximate noise-whitening for multi-input multi-output (MIMO) detection via banded-inverse extension (BIE). If a noise covariance matrix origins from a Gauss-Markov process (GMP), its inverse is banded and the proposal is exact and yields no accuracy-losses. For general matrices to be inverted, the approximation-errors from inversion introduce a mismatched MIMO detection-model, which can cause performance-degradation. Hence, we develop an information-theoretic tool with generalized mutual information (GMI) to evaluate the impacts from approximation-errors on the final achievable rate. We show that the approximate noise-whitening method based on BIE not only minimizes the noise-distortion measured from the Kullback-Leibler (KL) divergence, but also asymptotically maximizes GMI of the MIMO system as signal-to-noise ratio (SNR) increases. Besides, the proposal also provides a unified framework for approximate matrix-inverse with an adjustable band-size that can tune the trade-off between complexity and accuracy.


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    Title :

    Approximate Noise-Whitening in MIMO Detection via Banded-Inverse Extension


    Contributors:
    Hu, Sha (author) / Wang, Hao (author)


    Publication date :

    2022-09-01


    Size :

    813088 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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