Massively parallel systolic-array architectures for 2D IIR polyphase space-time plane-wave beam digital filters

摘要

A systolic architecture has recently been proposed for implementing two-dimensional infinite impulse response (IIR) space-time beam plane-wave filters at a throughput of one-frame-per-clock-cycle for such applications as real-time broadband smart antennas. A novel polyphase systolic architecture is proposed here that further increases the throughput of these IIR beam filters, by a factor of M, to M-frames-per-clock-cycle, where M is the number of polyphases. The proposed method combines the polyphase approach, along with pipelining and look-ahead optimization methods, to achieve frame sample frequencies that are several times higher than the clock-cycle limit of the very large-scale integration (VLSI) technology, thereby potentially allowing multi-GHz frame sample frequencies using current custom VLSI circuits. The implementation of a field programmable gate array-based real-time prototype is described, tested and verified for the two-phase case (M = 2) at a technology-limited clock frequency of 50 MHz which corresponds to a throughput of 100 million-frames-per-clock-cycle.