1 research outputs found
Uplink Spectral Efficiency Analysis of Multi-Cell Multi-User Massive MIMO over Correlated Ricean Channel
In this paper, the performance of uplink spectral efficiency in massive
multiple input multiple output (MIMO) over spacially correlated Ricean fading
channel is presented. The maximum ratio combining (MRC) receiver is employed at
the base station (BS) for two different methods of channel estimation. The
first method is based on pilot-assisted least minimum mean square error (LMMSE)
estimation, the second one is based on line-of-sight (LOS) part. The respective
analytical expressions of uplink data rate are given for these two methods. Due
to the existence of pilot contamination, the uplink data rate of pilot-assisted
LMMSE estimation method approaches to a finite value (we name it as asymptotic
rate in the paper) when the BS antenna number is very large. However, the data
rate of LOS method goes linearly with the number of BS antennas. The expression
of the uplink rate of LOS method also show that for Ricean channel, the spacial
correlation between the BS antennas may not only decrease the rate, but also
increase the rate, which depends on the locations of the users. This conclusion
explains why the spacial correlation may increase, rather than decrease the
data rate of pilot-assisted LMMSE. We also discuss the power scaling law of the
two methods, and the asymptotic expressions of the two methods are the same and
both independent of the antenna correlation.Comment: Submitted to Science Chin