Carrier frequency deviation estimation device and system

Abstract

The invention provides a carrier frequency deviation estimation device which is used for estimating the frequency deviation of receiving multi-carrier signals and comprises a converting circuit, a cosine effect cancelling circuit, a pattern generation circuit and an estimation circuit. The converting circuit is used for receiving the multi-carrier signals and converts the multi-carrier signals into single carrier signals. The cosine effect cancelling circuit comprises a delay circuit, a conjugate circuit, a multiplication circuit, an addition circuit and a division circuit, which are used for performing the delay operation, the conjugate operation, the multiplication operation, the addition operation and the division operation on single carrier signals respectively, so as to cancel the cosine effect existing during the frequency deviation estimation of the single carrier signals. The pattern generation circuit is used for generating a linear data module according to the single carrier signals, the cosine effect of which is eliminated. The estimation circuit is used for estimating the frequency deviation of the multi-carrier signals according to the linear data module. The invention provides a carrier frequency deviation estimation system. The carrier frequency deviation estimation device and the system thereof can quickly estimate the frequency deviation of the multi-carrier signals and eliminate the cosine effect of the existing estimator.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a carrier frequency offset estimation device and system. Background technique [0002] In wireless communication, when the signal transmitting end transmits the signal to the signal receiving end through the communication channel, the signal receiving end must know the start and end of the signal in order to demodulate the signal correctly. However, the delay effect produced by the communication channel and the mismatch of the oscillator frequency between the signal transmitting end and the signal receiving end will cause the phenomenon of carrier frequency offset, which will increase the difficulty of signal demodulation and cause the error rate of the communication system to increase greatly. . Among them, the inter-carrier interference caused by the frequency offset has the most serious impact on the performance of the communication system. [0003] At present, with the...

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Problems solved by technology

However, the delay effect produced by the communication channel and the mismatch of the oscillator frequency between the signal transmitting end and the signal receiving end will cause the phenomenon of carrier frequency offset, which will increase the difficulty of signal demodulation and cause the error rate of the communication system to increase greatly.

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