| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately demodulate signals for use in satellite positioning system (SPS). <P>SOLUTION: The present invention comprises: an input for receiving a first input signal comprising a word of transmitted data; a differential phase shift key demodulator for performing processing of the first input signal with a differential phase shift key demodulation so as to obtain from the first input signal a first set of first soft decision information values corresponding to bit index positions in a word; and receiving a second input signal. In the present invention, the differential phase shift key demodulator further processes the second input signal with shift key demodulation so as to obtain from the second input signal a second set of second soft decision information values corresponding to bit index positions in the word of transmitted data, and a mathematical function is performed on the first and second sets of corresponding first and second soft decision information values so as to obtain a third set of substitute soft decision information values corresponding to respective bit index positions in the word of transmitted data. <P>COPYRIGHT: (C)2012,JPO&INPIT |
