Digital phase-modulated signal carrier phase offset estimation method

Abstract

The invention relates to a digital phase-modulated signal blind carrier phase offset estimation method, which comprises the steps of (1) processing a received radio frequency signal so as to acquire a baseband sample value signal rn containing carrier phase offset theta0; (2) performing a joint power estimation algorithm, carrying out a summation operation on a received signal sample value rn of a power operation, calculating an angle after summation so as to acquire a carrier coarse phase offset estimation value, and carrying out phase compensation on the received signal so as to acquire a compensation signal rn'; (3) carrying out further correction calculation on the phase offset by adopting a WPH algorithm, judging a constellation point Cn which is the closest to the compensation signal {rn'} by using a standard constellation point set {Cm} whose straight-line distance with the compensation signal rn' is the shortest, and measuring a second-moment peak value of a weighted function of a phase histogram so as to acquire a carrier phase offset estimation value; and (4) carrying out phase jumping, providing a phase difference operation, and carrying out differencing on the phase of an ith segment and the phase of a (l-1)th segment and solving an average value. The method is combined with an M-power algorithm, a phase offset initial value is corrected, the phase offset estimation precision is improved, and the calculation complexity is reduced.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a method for estimating the carrier phase offset of a digital phase modulation signal. Background technique [0002] In the era of large capacity and big data communications, limited spectrum resources are extremely precious. Under limited resources, it is urgent to find a reasonable method to improve the effectiveness of spectrum use. Therefore, some efficient modulation methods such as QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), MPSK (Multiple Phase Shift Keying, multi-ary digital phase modulation) have been attracting attention. In the same communication system, different modulation methods may be adopted according to the channel conditions. For example, when the channel quality of HSPA+ (High-Speed ​​Packet Access+, enhanced high-speed packet access technology) is good, the uplink channel modulation method is changed from ...

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Problems solved by technology

However, the estimation accuracy of this method is not high enough

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