A Review of Channel Estimation Techniques for OFDM (original) (raw)
During the past few years, the developments in digital communication are rapidly increasing to meet the ever increasing demand of higher data rates. Data rate is decreases due to multipath fading in multiuser environment. OFDM becomes promising technique for achieving higher data rate. Orthogonal Frequency Division Multiplexing (OFDM) has an edge over other frequency multiplexing techniques by using more densely packed carriers, thus achieving higher data rates using similar channels. The primary importance of channel estimation is that it allows the receiver to take into account the effect of channel on the transmitted signal, secondly channel estimation is essential for removing ISI, noise rejection techniques etc. In this report the channel estimation techniques for OFDM is examined and its implementation in MATLAB using pilot based block type channel estimation techniques.. In the end, results of different simulations are compared to conclude that LS algorithm gives less complexity but MMSE algorithm provides comparatively better results. The focus of this paper is non-blind channel estimation technique & compare with blind techniques.
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