Orthogonal Frequency Division Multiplexing for Wireless Networks S
Abstract
When a high data rate is to be transmitted over a channel with relatively large maximum delay an alternative approach is given by the OFDM transmission technique. OFDM is a promising technique for the broadband wireless communication system. The idea of OFDM is to distribute the high rate data stream to many low rate data streams that are transmitted in a parallel way over many sub-channels, thus in each sub-channel the symbol duration is low as compared to maximum delay of channel and ISI can be handled, but it is up to some extent. However, a special problem in OFDM is its vulnerability to frequency offset errors due to which the orthogonality is destroyed that result in ICI. ICI causes power leakage among subcarriers thus degrading the system performance. In this paper we described the adaptive equalization for multipath faded OFDM system. Generally in OFDM system a rectangular pulse shaping technique is applied, the ICI will not occur, however out of band interference will present. Also we observed the Gaussian function for pulse shaping; in this case, the sub carrier spectra are also Gaussian functions and delay rapidly. In such a system, however both ISI and ICI over a few modulation symbols occur. The adaptive equalization with LMS and RLS algorithm mitigates this interference.
References
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