Impact of Low-Resolution ADC on DOA Estimation Performance for Massive MIMO Receive Array
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In this paper, we present a new scenario of direction of arrival (DOA) estimation using massive multiple-input multiple-output (MIMO) receive array with low-resolution analog-to-digital convertors (ADCs), which can strike a good balance between performance and circuit cost. Based on the linear additive quantization noise model (AQNM), the conventional Root-MUSIC methods are modified to be suitable for such as scenario. Also, the Cramer-Rao lower bound (CRLB) is derived to evaluate the performance loss due to the low-resolution quantization. The simulation results show that the modified Root-MUSIC methods can achieve the corresponding CRLB, and the CRLB performance loss is less than 0.5dB in the low SNR region even when the 2-bit ADCs are adopted. This means that 2-bit is sufficient for DOA measurement in the low SNR region if the 0.5dB performance loss is acceptable for practical applications.
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