Energy-Efficient Hybrid Precoder With Adaptive Overlapped Subarrays for Large-Array mmWave Systems

摘要: In large-array millimeter-wave (mmWave) systems, hybrid pre-coding is one of the most attractive research topics. This paper first presents a flexible adaptive overlapped subarray (OSA) architecture for analog precoder, whose can be adjusted by connection network. An objective function formulated to maximize energy efficiency (EE) in consideration insertion loss proposed OSA based precoder. The optimal scheme intractable achieve, so that we present heuristic scheme, where digital precoder designed on zero-forcing (ZF) rule and simplified EE optimization loss. We discuss effect non-ideal factors performance, such as quantized phases, imperfect channel state information (CSI), faulty switches. Simulation results show that, when initial transmit power large, our offers better performance than fully many other popular schemes. Moreover, it found switches make double-edged numbers activated phase shifters combiners are pre-defined.