Design and FPGA Implementation of a Reconfigurable 1024-Channel Channelization Architecture for SDR Application

摘要

In this paper, we present a novel channelization architecture, which can simultaneously process two channels of complex input data and provide up to 1024 independent channels of complex output data. The proposed architecture is highly modular and generic, so that parameters of each output channel can be dynamically changed even at runtime in terms of the bandwidth, center frequency, output sampling rate, and so on. It consists of one tunable pipelined frequency transform (TPFT)-based coarse channelization block, one tuning unit, and one resampling filter. Based on the analysis of the data dependence between the subbands, a novel channel splitting scheme is proposed to enable multiple subbands to share the proposed TPFT block. The multiplier block (MB) and subexpression sharing techniques are used to reduce the number of arithmetic units of the TPFT block. Moreover, the proposed Farrow-based resampling filter does not require division operation and dual-port RAMs resulting in significant area saving. Finally, we implement the proposed channelization architecture in a single field-programmable gate array. The experiment results indicate that our design provides the flexibility associated with the existing works, but with greater resource efficiency.