| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optimum detector for a receiver with high phase noise resistance employing a signal processing system introduced from an enhanced noise distribution model in a field of digital communication. <P>SOLUTION: The detector which adopts a pilot synchronization system using a PLL circuit for demodulating a digital signal, includes: an arithmetic section of (2) taking a complex conjugate value of a received signal expressed (1) as a point on a signal space diagram; an arithmetic section of (3) multiplying a complex number corresponding to a transmission object symbol with the result of (2) above; an arithmetic section of (4) taking the real part of a result of (3) above; an arithmetic section of (5) taking the imaginary part of a result of (3) above; an arithmetic section of (6) adding a product between the square of outputs of a communication path noise variance estimate unit and the square of reciprocal values of outputs of a phase error variance estimate unit to the real part; respective arithmetic sections of (7) squaring respective values of a result (6) and a result (5) above; an arithmetic section of (8) of summing the respective squared values of the result of (7) above; an arithmetic section of (9) extracting the root of the result of (7) above; an arithmetic section of (10) adding a reciprocal of squared outputs from the communication path noise variance estimate unit to the root of the result of (9) above; an arithmetic section of (11) extracting the logarithm of a Bessel function of the result of (10) above and providing an output, and the optimum detector for the receiver with high phase noise resistance is characterized in that the detector regards the output of (11) above as a branch metric, calculates a path metric by using the value, and estimates the transmission signal in a way of minimizing the path metric. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
