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Examples of receiver arrays used to measure the BER versus SNR response. Each circle represents a microphone. The array contains (A) 61, (B) 62, (C) 63, and (D) 64 microphones. These microphones form 4 rings with radii 5.4, 6.7, 8, and 9.3 wavelengths. For an array with n = 4n + r (where n and r are integers and r < 4) sensors, the inner r rings have n + 1 equally spaced sensors and the outer 4 − r rings have n equally spaced sensors.
