| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for estimating time-varying and frequency-selective channels. <P>SOLUTION: Time-varying and frequency-selective channels 130 in an orthogonal frequency division multiplexing (OFDM) network 120 are estimated by first storing, in a buffer at a receiver 122, a received signal corresponding to a set of pilot tones 100 of a set of OFDM symbols. The pilot tones are predetermined and inserted in frequency subcarriers and time slots of the OFDM symbol. A covariance matrix of the received signal is estimated. A diagonal matrix is estimated on the basis of the covariance matrix and a variance of noise in the received signal. The diagonal matrix indicates delays of non-zero paths in a time domain. A channel impulse response (CIR) for each OFDM symbol is estimated using the diagonal matrix and the received signal. Then, the CIR is transformed to the frequency domain to obtain the channel frequency response (CFR). <P>COPYRIGHT: (C)2013,JPO&INPIT |
