Title :
Combined equalisation and code assignment for expanded time-frequency OFDM system
Author :
Wu, Bin ; Shang, Yunlong ; Xiang, Haibing
Author_Institution :
Sch. of Electron. Eng. & Comput. Sci., Peking Univ., Beijing, China
Abstract :
Proposed is an effective approach to suppress noise interference in wireless communications, the expanded time-frequency (ETF-) OFDM system with joint time-frequency spreading. However, in this system, the orthogonality of the spreading code can be destroyed by multipath fading. Developed is a scheme that employs a zero-forcing equaliser at the receiver and assigns spreading codes at the transmitter for this system. Simulation results show that the ETF-OFDM system with the proposed scheme can take advantage of multipath fading to boost performance.
Keywords :
OFDM modulation; code division multiple access; codes; fading channels; interference suppression; spread spectrum communication; code assignment; equalisation assignment; expanded time-frequency OFDM system; joint time-frequency spreading; multipath fading; noise interference suppression; orthogonal frequency division multiplexing; zero-forcing equaliser;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2604
