Abstract
In single-input multi-output (SIMO) systems, imperfect time alignments result in random mismatch among the signals at receiving antennas, leading to performance degradation of maximum ratio combining (MRC). In this letter, by considering the timing errors at each receiving antenna, the closed-form expression of output signal-to-noise ratio (SNR) after performing MRC is calculated, and its statistical properties are investigated. Theoretical and simulation results show that the imperfect time alignment significantly degrades the output SNR, especially for high input SNR and large-scale receiving antennas. In addition, the system outage probability increases as the timing error increases or the number of receiving antennas decreases.
Published Version
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