C-RAN at Millimeter Wave and Above: Full-Beamspace Radio Access Architecture

Xiao-Feng Qi, J. Murakowski, G. Schneider, D. Prather
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引用次数: 0

Abstract

We report progress toward a RF-photonic centralized radio access network (C-RAN) architecture for distributed multi-point transmission over millimeter wave (mmW) spectra. The architecture comprises three components: (1) access points (APs) employing RF-photonic phased arrays capable of multibeam and multiband operation; (2) an RF-photonic beamspace processor unit (BPU) that carries out centralized beamspace processing across multiple APs, and (3) a single-fiber fronthaul capable of full-dimensional beamspace transportation between the BPU and the APs. It is shown that the photonic portion of the AP and the BPU can be extended with minimal alteration to include arrayed waveguide grating (AWG) functionality. The AWG feature allows a direct conversion between RF beams and optical wavelengths at the AP and the BPU, providing a scalable means of transporting the entire beamspace over a fronthaul network employing single-fiber wavelength division multiplexing (WDM).
毫米波及以上的C-RAN:全波束空间无线接入架构
我们报告了在毫米波(mmW)频谱上用于分布式多点传输的射频光子集中式无线接入网(C-RAN)架构的进展。该体系结构包括三个部分:(1)采用射频光子相控阵的接入点(ap),能够进行多波束和多波段操作;(2)在多个ap之间进行集中波束空间处理的rf -光子波束空间处理器单元(BPU),以及(3)能够在BPU和ap之间进行全维波束空间传输的单光纤前传。结果表明,AP和BPU的光子部分可以以最小的改变扩展到包括阵列波导光栅(AWG)功能。AWG功能允许在AP和BPU的RF波束和光波长之间进行直接转换,提供了一种可扩展的方式,通过采用单光纤波分复用(WDM)的前传网络传输整个波束空间。
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