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Carrier frequency deviation estimation device and system

A carrier frequency offset and estimation device technology, which is applied in the direction of modulated carrier system, multi-frequency code system, transmission system, etc., can solve carrier frequency offset, increase the difficulty of signal demodulation, increase the error rate of communication system, etc. problem, to achieve the effect of eliminating the cosine effect

Active Publication Date: 2009-10-21
CLOUD NETWORK TECH SINGAPORE PTE LTD
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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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  • Carrier frequency deviation estimation device and system
  • Carrier frequency deviation estimation device and system
  • Carrier frequency deviation estimation device and system

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Embodiment Construction

[0011] figure 1 It is a block diagram of an embodiment of the carrier frequency offset estimation system 500 of the present invention.

[0012] The carrier frequency offset estimation system 500 includes a carrier frequency offset estimation device 100 , a signal transmitting end 200 , a communication channel 300 and a signal receiving end 400 . In this embodiment, the signal transmitting end 200 sends the multi-carrier signal s(k) to the signal receiving end 400 via the communication channel 300, and at this time, the multi-carrier signal s(k) has become the multi-carrier signal r(k). The carrier frequency offset estimating device 100 is communicatively connected to the signal receiving end 400 for estimating the frequency offset of the multi-carrier signal r(k) received by the signal receiving end 400 . In this embodiment, the multi-carrier signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal, and the communication channel 300 is an Additive White Gaussian ...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04L1/06
CPCH04L27/2657H04L27/2675
Inventor 谢孟宏廖春发
Owner CLOUD NETWORK TECH SINGAPORE PTE LTD
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