The Universal Filtered Multicarrier (UFMC) waveform technology is one of the promising waveforms for 5G and beyond networks. Owing 2N-point Fast Fourier Transform (FFT) processor at UFMC receiver, computational implementation complexity two times more than conventional Orthogonal Frequency Division Multiplexing (OFDM) receiver system. In this paper, we proposed a simplified structure to reduce ...

A systematic approach is presented for automatically generating variable-size FFT/IFFT soft intellectual property (IP) cores for MIMO-OFDM systems. The finite-precision effect in an FFT processor is first analyzed, and then an effective word-length searching algorithm is proposed and incorporated in the proposed IP generator. From the comparison, we show that our analysis of the finite precisio...

This paper presents a novel high-speed, low-complexity two-parallel 128-point radix-24 FFT/IFFT processor for MB-OFDM ultrawideband (UWB) systems. The proposed high-speed, low-complexity FFT architecture can provide a higher throughput rate and low hardware complexity by using a two-parallel data-path scheme and a single-path delayfeedback (SDF) structure. The radix-24 FFT algorithm is also rea...

This work discusses the characteristics of a multicore processor to perform DMT/OFDM modulation, while eventually executing other concurrent tasks. The DMT modulation is of special interest because it has been adopted in several communication systems. As a case study, the TMS320C6670 is adopted, which has a (I)FFT coprocessor. The use of these coprocessors can be essential to make a DMT/OFDM fe...

In this correspondence, sparse channel estimation is first introduced in orthogonal frequency-division multiplexing (OFDM)-based cognitive radio systems. Based on the results of spectrum sensing, the pilot design is studied by minimizing the coherence of the dictionary matrix used for sparse recovery. Then, it is formulated as an optimal column selection problem where a table is generated and t...

Orthogonal frequency division multiplexing (OFDM) is an attractive multi carrier modulation technique for future broadband wireless transmission systems. However, the OFDM system exhibits high peak to average power ratio (PAPR) , large computational complexity by applying discrete Fourier transform (DFT) at the transmitter and inverse DFT (IDFT) at the receiver and sensitivity to carrier freque...

In this paper we investigate performances (bandwidth and speed) that could be obtained using basic logic structures for implementing improved Cooley-Tukey algorithm for IFFT/FFT in transmitter/receiver, as well the approach for implementing OFDM processing unit based on optimized ROM implementation. We implemented these techniques for OFDM in Virtex5 and Viterx7 FPGA boards, and we analyzed the...

A practical scheme to perform the fast Fourier transform in the optical domain is introduced. Optical real-time FFT signal processing is performed at speeds far beyond the limits of electronic digital processing, and with negligible energy consumption. To illustrate the power of the method we demonstrate an optical 400 Gbit/s OFDM receiver. It performs an optical real-time FFT on the consolidat...

This paper presents a reusable intellectual property (IP) Coordinate Rotation Digital Computer (CORDIC)-based split-radix fast Fourier transform (FFT) core for orthogonal frequency division multiplexer (OFDM) systems, for example, Ultra Wide Band (UWB), Asymmetric Digital Subscriber Line (ADSL), Digital Audio Broadcasting (DAB), Digital Video Broadcasting – Terrestrial (DVB-T), Very High Bitrat...

A major drawback in deploying beamforming scheme in orthogonal frequency division multiplexing (OFDM) is to obtain the optimal weights that are associated with information beams. Two beam weighting methods, namely co-phasing and singular vector decomposition (SVD), are considered to maximize the signal beams for such beamforming scheme. Initially the system performance with and without interlea...