While looking for reordering scheme of bit reversed FFT output for my paper about DeInterleaver, I stumbled upon a journal paper (“Design of an FFT/IFFT Processor for MIMO OFDM Systems”, DOI: 10.1109/TCSI.2006.888664). I also found other journal paper (“High Speed Mixed Radix FFT/IFFT Pipelined Architecture for MIMO OFDM WLAN 802.11n”, available at: http://www.eurojournals.com/ejsr_37_1_15.pdf ).
In my humble opinion, the last journal had significant similarity with your work. The similarity can be found for figures, Table I and II, and almost all chapters (Chapter II, Chapter III, Chapter IV, and Chapter V). The exception are occur in Chapter I Introduction and references.
In short, it is copy-paste… it is plagiarism.