| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a receiver for precisely controlling synchronization without using a preamble and a user code. <P>SOLUTION: The receiver is provided with a decryption part 5 for executing a single LDPC (low density parity check) decryption by 'sum-product algorithm' for a received signal at a plurality of sample points to be candidates for a sample starting point, a phase error estimation part 6 for executing estimation of a phase error by MMSE (minimum means squared error) by using soft decision information to be outputted in processes of the decryption, a multiplier 4 for compensating the received signal on the basis of an estimation result and a frame decision part 7 for deciding whether or not compensation processing is terminated by comparing an average (A) of absolute values of the latest logarithmic likelihood ratio with an average (B) of absolute values of logarithmic likelihood ratio just preceding the latest one, terminating the compensation processing in the case of B≥A and after that, defining a point corresponding to the maximum value of the averages of the logarithmic likelihood ratio in the candidates for the sample starting point as a sample starting point of a frame. <P>COPYRIGHT: (C)2004,JPO</p> |
