Coherent Combining-Based Initial Ranging Scheme for MIMO-OFDMA Systems

Yujie XIA
Guangliang REN

IEICE TRANSACTIONS on Communications   Vol.E97-B    No.10    pp.2203-2211
Publication Date: 2014/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.2203
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
multiple-input multiple-output (MIMO),  orthogonal frequency division multiple access (OFDMA),  initial ranging,  coherent combining,  multiuser detection,  

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A coherent combining-based initial ranging scheme is proposed for multiple-input multiple-output and orthogonal frequency division multiple access systems. The proposed algorithm utilizes the correlation properties of the ranging codes to resolve the multipath components, coherently combines the initial ranging signal of resolved path on each receiving antenna to maximize the output signal-to-interference-and-noise ratio, and then collects the power of the multipath signals to detect the states of the ranging codes. Simulation results show that the proposed scheme has much better performance than the available noncoherent combining method, and can accommodate more active ranging users simultaneously in each cell.