Polyphase filter bank channelizer FFT or IFFT I am referring to the Xilinx application note Polyphase Filter Bank Channelizer. The receiver portion should have FFT but the pdf mentions IFFT in both Tx and Rx.
The paper by F. J. Harris, C. Dick and M. Rice, &quot;Digital receivers and transmitters using polyphase filter banks for wireless communications,&quot; in IEEE Transactions on Microwave Theory and Techniques, vol. 51, no. 4, pp. 1395-1412, April 2003 also mentions the same.
How did Xilinx get proper results by implementing IFFT in both Tx and Rx?
Sorry, I didn't read the paper so this is just a guess.
FFT and IFFT are almost identical algorithms so it really makes no sense to code up both in an FPGA. Just use
$$F^{-1} (x) = F(x')/N, \\ F(x) = N \cdot F^{-1}(x)'$$
where N is the length of the FFT and &quot;'&quot; to conjugate complex operator.