Frame Structure Design Method for Frequency Offset Estimation of Large Frequency Offset Download Wave
A technology of frame structure design and coarse estimation of frequency offset, applied in carrier adjustment, modulated carrier system, digital transmission system, etc., can solve the problem of high signal-to-noise ratio threshold, achieve the effect of improving estimation accuracy, performance and impact
Active Publication Date: 2021-05-18
XIDIAN UNIV
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Problems solved by technology
This method uses pilot symbols and data symbols to estimate carrier frequency offset, and the estimation accuracy is further improved, but there is still the problem of high SNR threshold
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[0030] The embodiments and effects of the present invention will be further described below in conjunction with the accompanying drawings.
[0031] The application scenario of this example is frequency offset estimation for each hop in a frequency hopping communication system. The sender modulates the information of each hop and sends it to the channel. The modulation uses QPSK modulation, and the channel uses additive white Gaussian noise with additional carrier frequency offset; at the receiving end, the carrier frequency offset estimation is performed on the information sequence of each hop, and the corresponding frequency offset estimation value is obtained, and the receiving end of the corresponding hop The sequence is compensated, and finally the compensated received sequence is demodulated and decoded.
[0032] refer to figure 1 , the specific implementation steps of this example are as follows:
[0033] Step 1, set the initial number of segments.
[0034] (1a) Sele...
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The invention discloses a frame structure design method for large frequency offset download wave frequency offset estimation, which solves the problem of low estimation accuracy under low signal-to-noise ratio and large frequency offset in the prior art. The scheme is: the transmitting end first determines the initial number of equal-spaced pilot segments, and makes a rotating average periodogram for each segment of the pilot in the coarse frequency offset estimation stage of the receiving end; the normalized carrier frequency offset error value is obtained by statistics; if the error If the value meets the required accuracy requirements, stop segmentation and determine the final number of pilot segments, otherwise, update the number of segments until the normalized carrier frequency offset error value in the frequency offset estimation stage meets the accuracy requirements; determine the final segment After counting, the search range and search step factor of the fine estimation stage are determined by using the characteristics of the equal-spaced pilot periodogram; within this search range, the maximum likelihood carrier frequency offset estimation is performed to obtain the final frequency offset value. The invention can obtain better BER performance under large frequency deviation and low signal-to-noise ratio, and is suitable for carrier frequency deviation estimation in a frequency-hopping communication system.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a frame structure design method, which can be used for carrier frequency offset estimation with low signal-to-noise ratio and large frequency offset in a frequency hopping communication system. Background technique [0002] In a wireless communication system, the carrier frequency offset of both transceivers seriously affects system performance. In particular, the frequency hopping burst communication technology has the characteristics of strong anti-interference ability, high spectrum utilization rate, good confidentiality, anti-interception, anti-interference and so on. Due to the influence of long-distance transmission and various electronic interferences, the effective signal-to-noise ratio of the received signal is low, and the instability and frequency drift of the output frequency of the local oscillator, as well as the Doppler caused by the rela...
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IPC IPC(8): H04L27/00H04L29/06
CPCH04L27/0014H04L69/06H04L2027/0026
Inventor 孙锦华张立增郑晴花陈立王梓铭
Owner XIDIAN UNIV