Estimation method and estimation unit for frame head and integral frequency bias of receiver frame head

Abstract

The invention discloses an estimation method and an estimation unit for the phase and integer frequency bias of the frame head of a receiver, which comprises attaining the coarse synchronization position of the frame and the frame head mode sent from the transmitting terminal, estimating the combination of the frame head phase and the carrier frequency bias, to estimate the frame head phase and attain the slender synchronization position. The invention estimates the combination of the frame head phase and the carrier frequency bias, but not estimates them independently, to prevent the effect of the carrier frequency bias on the phase estimation and overcome the problems in traditional methods.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an estimation method and an estimation unit of receiver frame header phase and integer frequency offset. Background technique [0002] In a communication system, in order to correctly demodulate the transmitted data at the receiving end, reasonable channel estimation is required. At present, there are roughly two types of methods for estimating wireless channels, one is based on training sequences, and the other is based on pilots. [0003] Taking DTMB (Digital Terrestrial / Television Multimedia Broadcasting, digital TV terrestrial multimedia broadcasting) as an example to illustrate the channel estimation based on the training sequence. [0004] First introduce the frame structure and frame header sequence in the DTMB system in detail. There are three types of frame header PN sequences as training sequences in the DTMB standard: PN420, PN595 and PN945. [0005] figure 1 The...

AI Technical Summary

Problems solved by technology

Similarly, the PN sequence phases corresponding to PN420 frame header mode and PN945 frame header mode may change, so the phases of PN420 and PN945 sequences must be estimated before channel estimation and PN sequence deletion at the receiving end. The specific estimation tasks include PN Whether the phase of the sequence changes and the phase of the specific PN sequence; the traditional method often uses the local PN sequence to directly perform cross-correlation processing with the received signal without synchronization and frequency offset compensation. These methods are vulnerable to carrier frequency offset. Even when the carrier frequency deviation is large, it often leads to wrong judgment

Moreover, the traditional method is often difficult to achieve both, and it is impossible to ensure that the estimation of carrier frequency offset and frame header phase is as accurate as possible.

Images