A method for frequency deviation estimation
A technology of frequency offset estimation and frequency offset, applied in transmission control/equalization, shaping network in transmitter/receiver, baseband system components, etc.
Inactive Publication Date: 2010-12-29
ZTE CORP
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[0005] But the disadvantage of this method is: this method needs to use a known signal, and in the mobile communication system, in order to improve the communication efficiency of the system, such a known signal Usually it is very short or does not exist. For example, in the PCS system, the known signal length available in the TCH frame structure is only 12 symbols, and the estimation result obtained by using this patented method has poor precision; if there is no known signal, the method failure
[0007] In addition, this method uses search for frequency offset estimation, which requires a lot of calculation. For example, in a preferred embodiment of this method, the Within the frequency offset estimation range, the search process is implemented at an interval of 16 Hz. According to the conventional search method, 513 search operations are required. Even if the number of searches is reduced by some implementation techniques, the amount of calculation is still large, which brings a lot to the practical application of the method. inconvenient
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[0042] The present invention will be described in more detail below in conjunction with the accompanying drawings.
[0043] The present invention proposes a method for frequency offset estimation, the method comprising:
[0044] In the first step, the transmitter transmits the communication signal;
[0045] In the second step, the receiver receives the communication signal transmitted by the transmitter;
[0046] In the third step, the receiver obtains the reference signal of the received signal by means of coherent demodulation;
[0047] In the fourth step, the receiver obtains the rotation angle between the reference signal and the expected signal constellation diagram;
[0048] In the fifth step, the receiver converts the rotation angle into an estimated value of frequency offset.
[0049] In the first step, the signal vector transmitted by the transmitter is s, and s={s 1 ,s 2 ,...,s n}, where the subscript of each element of s indicates the time sequence of the tran...
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The invention relates to digital wireless communication field, especially relates to signal processing field, and discloses a projection method for frequency deviation, which includes: first step, the emitter sends the communication signal; second step, the receiver receives the communication signal emitted by emitter; third step, the receiver can obtain the reference signal by the method of relative demodulation; fourth step, the receiver obtains the reference signal and the rotation angle of constellation of presume signal, and the rotation angle contains the frequency offset information; fifth step, the rotation angle is converted into projection value of frequency offset by the receiver according to the fixed relationship between the rotation angle and the frequency offset. Using the method provided by the invention, it does not need the given known signal, and does not search in frequency extension comparing with present method, 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, in particular 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 harmful in the field of digital wireless communication, and 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 th...
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IPC IPC(8): H04B7/005H04L25/03
Inventor 王剑
Owner ZTE CORP