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Frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals

A technology of frequency offset estimation and frequency shift keying, which is applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve the problem that the frequency modulation index cannot be accurately obtained and cannot be accurately copied And other issues

Active Publication Date: 2015-04-08
TELINK SEMICON SHANGHAI
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Problems solved by technology

[0028] The technical problem to be solved by the present invention is to provide a method for estimating the frequency offset of a coherently demodulated FSK modulated signal, which can convert c(i) from x(i ), thereby avoiding the problem that the ideal receiving signal c(i) cannot be accurately copied at the receiving end because the frequency modulation index of the GFSK / FSK signal cannot be accurately obtained and will change with time and temperature, and the frequency offset is improved Estimated Accuracy

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  • Frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals
  • Frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals
  • Frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals

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[0066] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0067] The first embodiment of the present invention relates to a method for estimating the frequency offset of a coherently demodulated FSK modulated signal, such as figure 1 As shown, it specifically includes the following steps:

[0068] Step S101, providing a GFSK / FSK signal;

[0069] In this embodiment, the received G...

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Abstract

The invention relates to the field of digital wireless communication and discloses a frequency shift estimation method and system for coherent demodulation frequency shift keying modulating signals. According to the method and the system, prefix signals of GFSK (Gaussian Frequency Shift Keying) / FSK (Frequency Shift Keying) signals are designed to a string of fixed-length codes with altering 0 and 1, and according to the prefix signals, an ideal receiving signal c(i) can be completely eliminated from an x(i) under the condition that a receiver does not need to copy the ideal receiving signal c(i), thereby solving the problem that as the frequency modulation index of the GFSK / FSK signal can not be obtained accurately and can change along with time and temperatures, a receiving terminal can not accurately copy the ideal receiving signal c(i), so as to improve the accuracy of the frequency shift evaluation. Therefore, by virtue of the iteration-combination of frequency evaluation results of R(N), R(2N),..., R (KN), the phase ambiguousness caused by the large frequency shift can be eliminated, and the precision of the frequency shift evaluation can be improved further.

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 and system for estimating frequency offset of coherently demodulated FSK modulated signals. 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 frequen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 金海鹏聂宏
Owner TELINK SEMICON SHANGHAI
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