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Method and apparatus for differential detection of a unique word and demodulation with the use of differential detection of a unique word
Method and apparatus for differential detection of a unique word and demodulation with the use of differential detection of a unique word
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机译:用于对唯一词进行差分检测并通过对唯一词进行差分检测进行解调的方法和装置
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摘要
PROBLEM TO BE SOLVED: To detect an unique word(UW) by enlarging a measurement range while the resolution of the carrier frequency offset of a quasi-synchronization detecting signal is kept small and also keeping position detecting precision high. ;SOLUTION: In an initial acquisition mode, a UW delay detecting circuit 4 with a delay symbol number N(0.5N≤1) and the UW delay detecting circuit 7 with the delay symbol number N/2 are used so as to generate the UW detecting signal S5 of the quasi-synchronization detecting signal S2 and frequency offset information S8. Frequency offset information S8 reduces the frequency offset of the quasi-synchronization detecting signal S10 for demodulating a data signal. Then, the mode becomes a slight tuning acquisition mode, the UW delay detecting circuit 13 with the delay symbol number M(1M) is operated. When UW is detected from the quasi-synchronization detecting signal S11, the circuit 13 generates the UW detecting signal S5 and the double- check UW detecting signal S13.;COPYRIGHT: (C)1998,JPO
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