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We consider the use of channel feedback to determine the pilot placement for channel estimation of two-way OFDM relay links. We propose a feedback technique in which the pilot allocation mechanism is adapted to the doubly-selective channels. The reduction in the SNR due to channel estimation error is considered by the criteria of SNR gap ratio, thus, is utilized to design the pilot placement. A suboptimal...
We consider the channel estimation for two-way relay OFDM networks. Aiming at time-varying characteristic of doubly-selective channels, we proposed an soft input Kalman channel estimator. To take advantage of soft information provided by the decoder, we combine this the Kalman filter with Turbo equalizer, so we needn't many pilot symbols in practice, still can ensure the algorithm performance and...
Based on the matrix formulation of cooperative-OFDM signals, the bayesian CRB(BCRB) for blind, semi-blind and non-blind channel estimation in cooperative-OFDM system was derived. The BCRB for semi-blind channel estimation was a generic expression, which could be extrapolated to the BCRB for blind and non-blind channel estimation. The effect of the priori information on BCRB was also discussed. We...
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