Cooperative DF Protocol for MIMO Systems Using One-Bit ADCs

Abstract

This study considers a detection scheme for cooperative multi-input–multi-output (MIMO) systems using one-bit analog-to-digital converters (ADCs) in a decode-and-forward (DF) relay protocol. The use of one-bit ADCs is a promising technique for reducing the power consumption, which is necessary for supporting future wireless systems comprising a large number of antennas. However, the use of a large number of antennas remains still limited to mobile devices owing to their size. Cooperative communication using a DF relay can resolve this limitation; however, detection errors at the relay make it difficult to employ cooperative communication directly. This difficulty is more severe in a MIMO system using one-bit ADCs due to its nonlinear nature. To efficiently address the difficulty, this paper proposes a detection scheme that mitigates the error propagation effect. The upper bound of the pairwise error probability (PEP) of one-bit ADCs is first derived in a weighted Hamming distance form. Then, using the derived PEP, the proposed detection for the DF relay protocol is derived as a single weighted Hamming distance. Finally, the complexity of the proposed detection is analyzed in terms of real multiplications. The simulation results show that the proposed detection method efficiently mitigates the error propagation effect but has a relatively low level of complexity when compared to conventional detection methods.

Non-Orthogonal Multiple Access with One-Bit Analog-to-Digital Converters Using Threshold Adaptation

“…In particular, the utilization of one-bit ADCs as the receivers has been widely studied as an extreme case due to its high power efficiency. Extensive research has been dedicated to evaluating the performance of communication channels with one-bit ADCs [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

“…In [25], a one-bit ADC was used for an uplink massive MIMO system, and the corresponding throughput was analyzed. The paper [26] investigated a decode-and-forward relay protocol using one-bit ADCs. In [27], authors analyzed the performance of angle of arrival (AoA) estimation while considering the use of one-bit ADCs and DACs at the transmitter and receiver, respectively.…”