Cooperative Communication for Tracking and Surveillance Using Multiple Related Observations and Distributed Transmitters
Final rept. 1 Mar 2006-30 Nov 2009
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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We studied the performance of OFDM with imperfections due to receiver non-idealities, such as residual timing error, residual frequency error and noisy channel estimates, as well as due to channel characteristics, such as Doppler and delay spread exceeding the OFDM symbols cyclic prefix CP. These non-ideal characterizations are key to be able to assess how well a cognitive receiver can work with different channel conditions. For example, at low SNRs, it may be better to operate with a lower CP overhead, since the performance is limited by thermal noise. Conversely, in very high SNR regimes, it may be better to incur more CP overhead and possible pilot overhead to exploit the channel capacity at the regime by reducing the interference and by improving the channel estimates. More specifically, we presented an OFDM model thoroughly characterizing the intersymbol interference ISI and intercarrier interference ICI terms. Different data detectors were formulated, and performance comparisons were presented.
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