Synchronous method of large search range OFDM system carrier based on statistical uniform
A technique of statistical averaging and carrier synchronization, applied in multi-frequency code systems and other directions, and can solve problems such as the inability to guarantee maximum likelihood estimation
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[0071] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0072] The noise performance of the improved cyclic prefix based carrier frequency blind synchronization method can be realized by analyzing the received signal r(k). According to the system model defined above, within the OFDM bandwidth, the received signal r(k) is actually the superposition of the transmitted signal s(k) and the noise signal n(k), namely:
[0073] r(k)=s(k)+n(k) (20)
[0074] Note that the above signals can actually be regarded as a set of random complex number sequences, assuming that the variances of the real and imaginary parts of s(k) and n(k) are:
[0075] Var [ Re ( s 2 ( k ) ) ] = Var [ Im ( ...
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