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EURASIP Journal on Wireless Communications and Networking

, 2016:251

Radar and Sonar Networks

Abstract

Massive multiple-input-multiple-output MIMO, also known as very-large MIMO systems, is an attracting technique in 5G and can provide higher rates and power efficiency than 4G. Linear-precoding schemes are able to achieve the near optimal performance, and thus are more attractive than non-linear precoding schemes. However, conventional linear precoding schemes in massive MIMO systems, such as regularized zero-forcing RZF precoding, have near-optimal performance but suffer from high computational complexity due to the required matrix inversion of large size. To solve this problem, we utilize the Cholesky-decomposition and Sherman-Morrison lemma and propose CSM Cholesky and Sherman-Morrison strategy-based precoding scheme to the matrix inversion by exploiting the asymptotically orthogonal channel property in massive MIMO systems. Results are evaluated numerically in terms of bit-error-rate BERand average sum rate. Comparing with the Neumann series approximation of inversing matrix, it is concluded that, with fewer operations, the performance of CSM-based precoding is better than conventional methods in massive MIMO configurations.

KeywordsMassive MIMO Cholesky-decomposition Sherman-Morrison lemma Neumann series RZF CSM-based precoding  Download fulltext PDF



Autor: Yue Xu - Weixia Zou - Liutong Du

Fuente: https://link.springer.com/







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