期刊
IEEE COMMUNICATIONS LETTERS
卷 24, 期 5, 页码 991-994出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2020.2971467
关键词
Relays; Quantization (signal); Massive MIMO; Nonlinear distortion; Fading channels; Covariance matrices; Massive MIMO; relaying systems; variable resolution ADCs; DACs
资金
- National Key R&D Program of China [2018YFB1802000]
- Guangdong province Key Project of Science and Technology [2018B010115001]
- National Natural Science Foundation of China (NSFC) [61831004, 61871070]
Focusing on massive multiple-input and multiple-output (MIMO) relaying systems with variable resolution analog- to-digital converters (ADCs) and digital-to-analog converters (DACs), we derive the exact and approximate closed-form expressions for the achievable rate over Rayleigh fading channels. Numerical results reveal that the low-resolution DACs degrade the system performance much more than the low-resolution ADCs, and that the low-resolution ADCs and DACs achieve better energy efficiency. Moreover, provided that the total number of quantization bits is constrained, we find that the achievable rate is optimal when all ADCs and DACs adopt the same quantization bits from the perspective of statistic.
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