Low-Cost Distributed Massive MIMO System: Achievable Rate and Energy Efficiency
IEEE Global Communications Conference(2017)
摘要
This paper proposes a low-cost distributed massive multiple-input multiple-output (MIMO) system, which employs the mixed analog-to-digital converter (ADC) remote radio heads (RRHs). In particular, the RRHs with low-resolution ADCs connect with the baseband unit through wireless fronthaul while the RRHs with full-resolution ADCs connect with the baseband unit through fiber. After estimating the channel state information between RRHs and users, we derive the closed-form expressions for achievable downlink rate and energy efficiency. Based on these analytical results, we find that our distributed architecture can obtain remarkable gains compared with the centralized layout. Moreover, compared with the conventional distributed network with pure expensive full-resolution ADCs, our mixed-ADC architecture can achieve the rate requirement in a more energy-efficient and low-cost way, especially for the low rate demands. Additionally, we also present the optimal RRH assignment proportion that can maximize the energy efficiency under a fixed total number of RRHs, which can be used as guidelines for practical network configuration.
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关键词
Achievable rate,distributed massive MIMO,energy efficiency,hybrid fronthaul,mixed-ADC receiver
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