Ruijie Xu, Jianhua Zhang ,Jie Xi
Publish Year: 2017
Abstract: This paper mainly focus on the analysis of the eigenvalues and capacity for massive multiple-input multiple-output (MIMO) systems based on the channel measurements conducted at 3.5 GHz with 200 MHz. The measurements are conducted under three typical deployment scenarios: the Outdoor to Indoor (O2I), the Urban Macro cell (UMa) and the Urban Micro cell (UMi). Then we investigate the results of the normalized eigenvalues of the channel correlation matrix and angular spread (AS) for both azimuth and elevation direction. Under the line of sight (LoS) condition, the cumulative density function (CDF) of the normalized eigenvalues under O2I has the most uniform distribution followed by UMi, and UMa in the last. The eigenvalues and the orthogonality between sub-channels are affected by the angular spread. The AS of both azimuth and elevation arrival angle under UMi scenario are the biggest, and smallest under UMa. Finally, ergodic capacity for all scenarios is investigated and the advantages of the Massive MIMO system are highlighted. With same signal to noise ratio (SNR), the largest capacity is achieved under UMi in non-line of sight (NLoS) condition.