A method for frequency deviation estimation
A technology of frequency offset estimation and frequency offset, which is applied in the field of signal processing and digital wireless communication, can solve the problems of frequency offset estimation result errors, increase the probability of abnormal situations, and poor estimation result precision, etc., to suppress additive noise , reduce complexity, and estimate the effect of high accuracy
Inactive Publication Date: 2011-03-09
ZTE CORP
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[0006] But the shortcoming of this method is: this method will use a section of known signal, and in mobile communication system, in order to improve system communication efficiency, such known signal is usually very short or does not exist, for example in PCS system, TCH The known signal length available in the frame structure is only 12 symbols, and the estimation results obtained using this patented method are less accurate; if no known signal exists, the method fails
[0007] At the same time, when this method is applied in actual engineering, it is necessary to first estimate the position of the known signal in the received signal, which increases the complexity of the method and also increases the probability of abnormal situations, that is, when the position of the known signal is incorrectly estimated, The frequency offset estimation result of this method is wrong
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[0041] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0042] The frequency offset estimation method of the present invention, the method includes:
[0043] In the first step, the transmitter transmits the communication signal;
[0044] In the second step, the receiver receives the communication signal transmitted by the transmitter;
[0045] In the third step, the receiver obtains the reference signal and the estimated signal of the received signal by means of coherent demodulation;
[0046] In the fourth step, the receiver obtains the cost function value within the frequency offset estimation range by using the detection frequency offset value, the reference signal and the estimated signal as input;
[0047] In the fifth step, the receiver searches for the best cost function value among the obtained cost function values, and the corresponding detection frequency offset value is the estima...
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The invention relates to digital wireless communication field, and discloses a projection method for frequency deviation, which includes: the emitter sends the communication signal; the receiver receives the communication signal emitted by emitter; the receiver can obtain the reference signal and projection signal by the method of relative demodulation; the receiver detects the frequency offset, reference signal and projection signal in projection extent and works as the input to obtain the cost function value; the receiver searches the optimal cost function value in obtained function cost value to obtain the projection value of frequency offset. The method in invention obtain the reference signal and projection value base on relative demodulation, and it does not need the given known signal, at the same time it can limit the effect of noise partly in signal processing, and be realized easily, and high accuracy.
Description
technical field [0001] The invention relates to the field of digital wireless communication, especially to the field of signal processing, in particular to a method for frequency offset estimation. Background technique [0002] In the field of digital wireless communication, frequency offset estimation is one of the commonly used signal processing methods. [0003] Since the base station and the mobile station, or the carrier frequency between the mobile station and the mobile station cannot be absolutely equal, there is a relatively fixed frequency offset between the actual received signal and the expected received signal of the receiver. This frequency offset is detrimental in the field of digital wireless communications, it can reduce the accuracy of channel estimation and cause an increase in bit error rate. Therefore, in a digital wireless communication system, the receiver usually needs to estimate the frequency offset according to the uplink received signal, and then...
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IPC IPC(8): H04B7/005H04B7/26
Inventor 王剑
Owner ZTE CORP