Spectral efficiency of multi-user millimeter wave systems under single path with uniform rectangular arrays

摘要: In this paper, we investigate the downlink achievable ergodic spectral efficiency (SE) of a single-cell multi-user millimeter wave system, in which uniform rectangular array is used at base station (BS) to serve multiple single-antenna users. We adopt three-dimensional channel model by considering both azimuth and elevation dimensions under single-path propagation. derive SE for system with maximum ratio transmission precoding. This analytical expression enables accurate quantitative evaluation effect number BS antennas, signal-to-noise (SNR), crosstalk (squared inner product between different steering vectors) function angles departure (AoD) users inter-antenna spacing. Results show that logarithmically increases antennas converges value high SNR regime. To improve SE, also propose user scheduling scheme based on feedback users’ AoD information obtain SE. Furthermore, consider dense scenario where every user’s becomes nearly identical then system’s minimum