Speaker
Andrew Martens
(SARAO)
Description
Decomposing a wideband signal into smaller frequency components is required for many radio astronomy signal processing systems. A standard digital method involves using the efficient FFT algorithm. However, this often provides an inferior channel response in terms of passband flatness, rolloff etc. A polyphase filterbank (PFB) can be used to improve these. The channel overlap can be controlled by using an oversampled version of this filter. Relevant theory as well as details of a streaming, wideband oversampled PFB implementation targeting FPGAs will be provided. The implementation will be an addition to the CASPER HDL DSP library (based on a library released by Astron).
