Title :
Implementation of an inter-carrier interference self-cancellation technique for OFDM system in Altera CYCLONE II FPGA
Author :
Mamat, Muhammad Hasrul ; Husin, Nasir Shaikh ; SyedYusof, Sharifah Kamilah
Author_Institution :
Fac. of Electr. Eng., Univ. Teknol. Malaysia, Skudai
Abstract :
Frequency offset is of the main problems in Orthogonal Frequency Division Multiplexing (OFDM) system. A frequency offset between the local oscillator at the transmitter and receiver causes frequency shift in the signal, while in time-varying channel, it can cause a spread of frequency shift known as the Doppler spread. This leads to loss in the orthogonality between subcarriers and results in intercarrier interference (ICI). A simple and effective ICI self-cancellation scheme based on the signal mapper (a, -a) at k, k+1 subcarrier has been proposed to reduce the effect of frequency offset. The aim of this project is to develop the ICI self-cancellation using 64-point FFT/IFFT (IP core from Altera) for practical OFDM transmitter and receiver system. This ICI self-cancellation is designed using VHDL for Altera FPGA device, Cyclone II. Detailed structures of each block in the ICI self-cancellation system are presented.
Keywords :
IP networks; OFDM modulation; fast Fourier transforms; field programmable gate arrays; hardware description languages; intercarrier interference; wireless LAN; 64-point FFT-IFFT; Altera CYCLONE II FPGA; OFDM receiver system; OFDM transmitter system; VHDL; intercarrier interference self-cancellation technique; local oscillator; orthogonal frequency division multiplexing; signal mapper; time-varying channel; wireless local area networks; Circuits; Clocks; Cyclones; Field programmable gate arrays; Flip-flops; Interference; OFDM modulation; Quadrature phase shift keying; Shift registers; Transmitters;
Conference_Titel :
Electronic Design, 2008. ICED 2008. International Conference on
Conference_Location :
Penang
Print_ISBN :
978-1-4244-2315-6
Electronic_ISBN :
978-1-4244-2315-6
DOI :
10.1109/ICED.2008.4786642