This paper is a survey regarding the orthogonal frequency division multiplexing. The requirement for high speed data transmission has increased, with the rapid growth of digital communication in recent years. UWB delivers much potential for design of high speed wireless communication system. MB-OFDM (UWB) offers high data rates access for wireless communications. OFDM system is use for high spe...

Other than the conventional fast Fourier transform (FFT) for multicarrier modulation, a new approach for multicarrier modulation (MCM) has been known. Meanwhile, multicarrier modulation involves dividing the broadband channel into many orthogonal but overlapping narrowband carriers. In an OFDM modulation based multicarrier system using the FFT, a cyclic prefix (CP) is inserted after each symbol...

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier communication system. It is widely used because of its immunity to frequency selective fading channels. In this paper, the design and an implementation of OFDM transceiver on FPGA is presented. The system is designed using VHDL, synthesized using high level synthesis tool and targeted on Xilinx Spartan 3e device. Presented desi...

In this paper, we present a 128-point FFT/IFFT processor for ultrawideband (UWB) systems. The proposed FFT is developed based on the higher radix -2 4 . It reduces computational complexity and hardware requirement compared to conventional radix -2 FFT. Since the proposed pipelined architecture for 128-point FFT is designed using mixed-radix (16+8) multipath delay feedback (MRMDF). The proposed ...

This paper presents a novel high-speed, lowcomplexity 128/64-point radix-24 FFT/IFFT processor for the applications in a high-throughput MIMO-OFDM systems. The high radix radix-24 multi-path delay feed-back (MDF) FFT architecture provides a higher throughput rate and low hardware complexity by using a four-parallel data-path scheme. The proposed processor not only supports the operation of FFT/...

We are interested in developing a programmable baseband processor for multiple radio standards, including the wireless LAN standards 802.11a and 802.11b. 802.11a is based on OFDM and uses a 64-point FFT. Demodulation of the complementary code keying (CCK) used in 802.11b includes the computation of a modified Walsh transform. Similarities have been found between the radix-4 FFT and the fast Wal...

The scarcity of radio spectrum has become problem in many applications that utilize the higher Radio Frequencies (RF). It is therefore important to manage this resource carefully to avoid the waste. In order to optimize the RF spectrum, in 1997, The United Kingdom launched the world’s first commercial digital terrestrial television service, aimed to switch off the analogue services between 2008...

This paper represents low power and high speed 128-point pipelined Fast Fourier Transform (FFT) and its inverse Fast Fourier Transform (IFFT) processor for OFDM. The Modified architecture also provides concept of ROM module and variable length support from 128~2048 point for FFT/IFFT for OFDM applications such as digital audio broadcasting (DAB), digital video broadcasting-terrestrial (DVB-T), ...

In this paper, the architecture and the implementation of a 2K/4K/SK-point complex fast Fourier transform (FFT) processor for OFDM system are presented. The processor can perform 8K-point FFT every 273p , and 2K-point every 68.26~s at 30MHz which is enough for OFDM symbol rate. The architecture is based on the Cooley-Tukey algorithm for decomposing the long DFT into short length multi-dimension...