Massive MIMO is considered an important technique for improving cellular system capacity through the use of high gain adaptive beamforming and high-order spatial multiplexing. For downlink Frequency-Division Duplex (FDD) cellular systems, limited feedback strategies can provide the information needed for computing the transmit weights for Single User or Multi-User MIMO. However, for MU-MIMO transmission accurate channel knowledge is critical for obtaining the best performance. In this paper, we explore the performance characteristics of several limited feedback schemes with 2D cross-polarized arrays for evolutions beyond the current 3GPP LTE Rel-12 standard. We characterize the performance of product codebook-based feedback along with several scalar quantization schemes, all schemes having different levels of feedback overhead requirements. This is compared against a high performing Rel-12 compatible vertical sectorization scheme at the low end and also against the performance with ideal knowledge of the downlink covariance matrix at the high-end. We consider a 64 element transmit array with 16 transceiver units as a case study on the effects of various restrictions on the feedback scheme, such as a DFT beam structure, block diagonal structure, and Kronecker azimuth/elevation structure.


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    Title :

    Performance of Limited Feedback Strategies with Massive MIMO


    Contributors:


    Publication date :

    2015-09-01


    Size :

    322661 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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