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Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

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162 Implementation Issues4.3.4.4 Complexity <strong>and</strong> Performance AspectsA simple alternative to optimum Wiener filtering is a DFT-based channel estimator illustratedin Figure 4-22. The channel is first estimated in the frequency domain on the N pilotsub-carriers where pilots have been transmitted. In the next step, this N pilot estimates aretransformed with a N pilot point IDFT in the time domain <strong>and</strong> the resulting time sequencecan be weighted before it is transformed back in the frequency domain with an N c pointDFT. As long as N pilot

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