Figure 3From: Performance of opportunistic fixed-beam spatial multiplexing in OFDMA uplinkSimulated base station antenna patterns. Simulated base station antenna patterns for the reference case on top (antenna patterns 1 and 2) and the beam patterns for the fixed beam approach at bottom (Butler beam patterns 1 and 2). The patterns were generated assuming two monopole antennas with the antenna spacing of 0.5 carrier wavelengths and a ground plane dimension of 2.5 wavelengths. An effect of mutual coupling between antennas is evident in both the reference antenna patterns and the fixed beam patterns.Back to article page