Carrier wave frequency offset compensation method, apparatus and receiving system

Abstract

A carrier wave frequency offset compensation method, an apparatus and a receiving system are disclosed. The carrier wave frequency offset compensation method comprises the following steps of aiming at each sweeping frequency point in a sweeping frequency scope, calculating a signal intensity indication value of a receiving signal respectively, wherein the sweeping frequency point is used for adjusting a frequency of a receiving-end local oscillator signal; based on the signal intensity indication value and a frequency value of each corresponding sweeping frequency point, determining an estimation value of the carrier wave frequency offset; based on the estimation value of the carrier wave frequency offset, adjusting the frequency of the local oscillator signal so as to realize compensation to the carrier wave frequency offset. Further, through a fine compensation method of the carrier wave frequency offset, the fine compensation is performed on the carrier wave frequency offset after the compensation. Under the condition that the carrier wave frequency offset is large, estimation and compensation can be performed on the carrier wave frequency offset effectively. Under a small bandwidth work mode of a low pass filter, the large carrier wave frequency offset can be compensated. Receiver performance is increased and simultaneously a carrier wave frequency offset compensation scope can be effectively expanded.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a carrier frequency offset compensation method and device, and a receiving system. Background technique [0002] In a communication system, when a digital baseband signal is transmitted over a long distance, it is necessary to carry out carrier modulation on the digital baseband signal. The transmitting end in the communication system selects an appropriate modulation method and an appropriate carrier frequency according to the characteristics of the transmission channel, and converts the modulated The digital baseband signal is sent out through the radio frequency transmission circuit. After receiving the signal, the receiving end in the communication system combines with the local carrier through the mixer and performs down-conversion processing, and finally sends the down-conversion signal to the demodulation unit. Perform data demodulation to obtain demodulated...

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Problems solved by technology

from figure 2 It can be seen that if the passband bandwidth of the low-pass filter is too narrow, when the carrier frequency offset is large, it is easy to filter out some or even all useful signals, which in turn leads to carrier frequency offset estimation errors

And if the passband bandwidth of the low-pass filter is too wide, such as image 3 As shown, more noise and interference signals will be introduced while capturing effective signals

[0007] It can be seen that the setting of the passband bandwidth of the low-pass filter has certain limitations in the compensation of large carrier frequency offsets. It is difficult for the existing technology to ensure that the low-pass filter can still compensate for large carrier frequency offsets in the low-bandwidth working mode. Partial

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