Method, device and communication equipment for estimating frequency deviations

Abstract

The present invention discloses a method, a device and communication equipment for estimating frequency deviations. The device includes: a decision executing module, for processing a hard decision to a quadrature amplitude modulation data in first and second data blocks received in each of a plurality of code channels to obtain a quadrature phase shift keying data corresponding to the quadrature amplitude modulation data; a multiplication executing module, configured to obtain non-phase-modulation data corresponding to the quadrature amplitude modulation data by multiplying a conjugation of the quadrature phase shift keying data with the quadrature amplitude modulation data; a difference obtaining module, configured to obtain the difference between the first and second data blocks received in each of a plurality of code channels by using the non-phase-modulation data corresponding to the quadrature amplitude modulation data; and a frequency deviation estimating module, configured to estimate the frequency deviation between the data sender and receiver by using the difference between the first and second data blocks received in each of a plurality of code channels.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a frequency offset estimation method, device and communication equipment applicable to a time division synchronous code division multiple access system. Background technique [0002] With the development and popularization of wireless communication, the number of mobile communication users is increasing rapidly. Users have higher and higher requirements for communication speed and quality. In a wireless communication system, the sender modulates the information to be sent onto the carrier, and sends the information to the receiver through the carrier. This carrier must be regenerated for the receiver to accurately demodulate the information from the sender. Although nominally this carrier is known in advance by the sender and the receiver, there is a frequency offset (hereinafter referred to as frequency offset) between the carrier used by the sender and the carrier receiv...

AI Technical Summary

Problems solved by technology

This method has no problem when the received data is QPSK modulated data, but when the received data is 16QAM modulated data, the statistical value of the received signal needs to be calculated, and the hard judgment value can be obtained after some calculations. The method is more complicated , and because the distance between each constellation point in a quadrant is smaller than that of QPSK modulation, due to the existence of noise and frequency offset, it is easy to make a wrong judgment when performing 16QAM hard judgment, which will affect the calculation result of frequency offset

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