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METHOD AND APPARATUS FOR DETECTING A PARITY ERROR IN A SEQUENCE OF DQPSK SYMBOLS OF A DIGITAL TRANSMISSION SYSTEM
METHOD AND APPARATUS FOR DETECTING A PARITY ERROR IN A SEQUENCE OF DQPSK SYMBOLS OF A DIGITAL TRANSMISSION SYSTEM
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机译：用于确定数字传输系统的DQPSK符号序列中的奇偶校验错误的方法和装置
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摘要
The invention relates to a method for detecting a parity error in a sequence of DQPSK symbols of a digital transmission system, comprising determining (101) a first demodulated symbol r1 as a parity between a first DQPSK symbol x(n-2) and a second DQPSK symbol x(n-1); determining (102) a second demodulated symbol r2 as a parity between the second DQPSK symbol x(n-1) and a third DQPSK symbol x(n), wherein the first x(n-2), the second x(n-1) and the third x(n) DQPSK symbols are contiguous symbols of the sequence of DQPSK symbols; determining (103) a first parity symbol p1 as a parity between a fourth DQPSK symbol x(n-k) and the third DQPSK symbol x(n); determining (104) a second parity symbol p2 as a parity between a fifth DQPSK symbol x(n-k-m) and the fourth DQPSK symbol x(n-k), wherein the third x(n), the fourth x(n-k) and the fifth x(n-k-m) DQPSK symbols are different and non-contiguous symbols of the sequence of DQPSK symbols; determining (105) a super-parity symbol q1 as a parity between the fifth DQPSK symbol x(n-k-m) and the third DQPSK symbol x(n); and detecting (106) a parity error in the sequence of DQPSK symbols by comparing a combination of the first parity symbol p1 and the second parity symbol p2 against the super-parity symbol q1, wherein a parity between two DQPSK symbols describes a phase difference between the two DQPSK symbols.
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