Abstract
The performance analysis, using outage capacity for a forward link cellular communications system is presented. The effects of correlated fading, the distribution of angle of arrivals, and the array configurations are considered. The objective is to examine the effect of angle of arrival (AOA) energy distributions on two systems (transmit diversity and beamforming) with angle spread. We do so by comparing the performance of transmit diversity with a system that uses beamforming to point a relatively narrow beam at the mobile station. Analytical results show that the transmit diversity system using uniform linear arrays (ULA) and uniform circular arrays (UCA) with truncated Laplacian AOA, performs better even at smaller angle spreads as compared to other energy distributions. The ULA geometry is a preferable configuration for transmit diversity system as compared to UCA.
Highlights
The use of multiple antennas at the base station to create spatial diversity provides an effective technique for reducing the effects of fading
The beamforming system is normally designed so that the fading at the antennas is highly correlated for wide range of angular spreads, while transmit diversity is designed so that the fading will be decorrelated for small angle spreads
The notation in the following figures are given as, TD-U, TD-G, and TD-L which stands for transmit diversity system with uniform angle of arrival (AOA), transmit diversity with truncated Gaussian AOA, and transmit diversity with truncated Laplacian AOA, respectively
Summary
The use of multiple antennas at the base station to create spatial diversity provides an effective technique for reducing the effects of fading. Some of the research works using antenna arrays in the downlink for particular environments have been proposed in [2,3,4,5,6] for correlated fading channels. In these papers, the authors use combination of space-time block codes (STBC) with beamforming. We study the transmit diversity and transmit beamforming for multi-input-single-output (MISO) system, and present a comparative analysis/results of the two systems by taking into account the various AOA energy distributions, and array geometry.
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