Method for judging effectiveness of symmetric binary search estimation value of timing deviation

Abstract

The invention discloses a method for judging the effectiveness of a symmetric binary search estimated value of timing deviation, which is applied to the nth iteration timing deviation estimation operation and is used for screening out an effective estimated value from two different residual timing deviation pre-estimated values. The method comprises the following steps: respectively calculating the total energy P1 of digital modulation symbols in a signal sample sequence r1 and the total energy P2 of digital modulation symbols in a signal sample sequence r2; according to the size relation between P1 and P2, judging the effectiveness of residual timing deviation pre-estimated values tau 1 [n] and tau 2 [n], wherein the rule is as follows: if P1 is greater than P2, the pre-estimated value tau 1 [n] is judged to be effective, and tau value [n] is equal to tau 1 [n]; otherwise, judging that the pre-estimated value tau < 2 > [n] is valid, and taking tau < valve > [n] = tau < 2 > [n]. The method is a blind judgment method, does not need pilot assistance, only needs to use enough symbols, and can still obtain good judgment performance even under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the detection technology in the digital communication technology, in particular to a method for judging the validity of the symmetric half search estimation value of the timing deviation. Background technique [0002] In an all-digital communication receiver, symbol synchronization is used to accurately recover useful data symbols from received signals with timing deviations. A typical symbol synchronization method is as follows: firstly, a certain statistical estimation method is used to directly estimate the timing deviation of the symbol; then, the timing deviation of the symbol is corrected according to the estimated value of the timing deviation. Therefore, the pros and cons of timing offset estimation methods will have a direct impact on the performance of symbol synchronization. For burst signals, under the conditions of few pilot symbols, small symbol oversampling factor, and low signal-to-noise ratio, it is difficult ...

AI Technical Summary

Problems solved by technology

For burst signals, under the conditions of few pilot symbols, small symbol oversampling factor, and low signal-to-noise ratio, it is difficult for conventional statistical estimation methods to obtain good estimation performance

Images