Baseband Design for 5G UDN Base Stations:Methods and Implementation  

作　　者：Zhaoyun Cai Dake Liu 

机构地区：[1]Lab of Application Specific Instruction-set Processors,Beijing Institute of Technology,Beijing 100081,China

出　　处：《China Communications》2017年第5期59-77,共19页中国通信（英文版）

基　　金：supporting from National High Technical Research and Development Program of China(863 program)2014AA01A705 is sincerely acknowledged by authors

摘　　要：Baseband design and implementation for micro/pico base stations （mBS） in 5G ultra-dense network （UDN） is studied. Low cost is an essential requirement for mBS baseband in UDN. Digital baseband cost of ASIC/ASIP （Application Specific Integrated Circuit / Instruction-set processor） is of the most uncertainty in roBS system. However. the actual costs and hardware feasibility of the baseband are yet unknown to network deployers and researchers. In this paper, we studied the baseband hardware system design and implementation for low-cost roBS. We analyzed popular baseband algorithms and architectures for both full-digital and hybrid beamforming （BF） for UDN. We then proposed feasible chip-level solutions for the baseband with up to 128-antenna BS system, and estimated their implementation cost. Results show that among lull-digital BF algorithms, zero-forcing is a choice of high performance and low cost; for hybrid BF, 4×32 architecture （32 RF chains） provides good reduction in baseband cost with acceptable performance loss, thus it can be a preferable solution under low cost consider- ation. The proposed system planning method can also be used for the design of other related systems.Baseband design and implementation for micro/pico base stations(m BS)in 5G ultra-dense network(UDN)is studied. Low cost is an essential requirement for m BS baseband in UDN. Digital baseband cost of ASIC/ASIP(Application Specific Integrated Circuit/Instruction-set processor)is of the most uncertainty in m BS system. However,the actual costs and hardware feasibility of the baseband are yet unknown to network deployers and researchers. In this paper,we studied the baseband hardware system design and implementation for low-cost m BS. We analyzed popular baseband algorithms and architectures for both full-digital and hybrid beamforming(BF)for UDN. We then proposed feasible chip-level solutions for the baseband with up to 128-antenna BS system,and estimated their implementation cost. Results show that among full-digital BF algorithms,zero-forcing is a choice of high performance and low cost; for hybrid BF,4×32 architecture(32 RF chains)provides good reduction in baseband cost with acceptable performance loss,thus it can be a preferable solution under low cost consideration. The proposed system planning method can also be used for the design of other related systems.

关 键 词：5G Communication ASIC/ASIP UDN baseband implementation massive MIMO 

分 类 号：TN929.5[电子电信—通信与信息系统] TU723.3[电子电信—信息与通信工程]