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A minimum frequency shift keying modulation system synchronization method and device

A frequency-shift keying and modulation system technology, applied in the direction of modulation carrier system, transmission system, digital transmission system, etc., can solve the problems of reduced quality of correlation values, low synchronization success rate of minimum frequency-shift keying modulation system, etc., to achieve improved The effect of synchronization success rate

Active Publication Date: 2015-09-02
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] However, in the synchronization process using the above-mentioned traditional sliding correlation method, the received data at the baseband is often subjected to Gaussian filtering and strong inter-symbol interference (ISI) caused by the wireless channel, which reduces the quality of the correlation value and leads to the minimum frequency shift The synchronization success rate of the key modulation system (typically such as GSM system) is low

Method used

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  • A minimum frequency shift keying modulation system synchronization method and device
  • A minimum frequency shift keying modulation system synchronization method and device
  • A minimum frequency shift keying modulation system synchronization method and device

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Experimental program
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Embodiment 1

[0065] A synchronization method for MSK and GMSK modulation systems proposed by the present invention, such as Figure 4 As shown, the following process is included:

[0066] 101. Data receiving: The baseband single-speed data received by the receiving end is:

[0067] R 1 (n)=I 1 (n)+i·Q 1 (n) (1)

[0068] In formula (1), n ​​= 1, 2, ..., N, N is the data length, i is the imaginary unit, and I 1 Is the in-phase component, Q 1 Is the quadrature component.

[0069] Preferably, if the data length N is greater than or equal to the burst effective length, the subsequent synchronization process is executed; otherwise, the synchronization process is ended.

[0070] 102. Data preprocessing: restore the received baseband data to ideal data before MSK mapping. First, to receive baseband data R 1 Perform phase reverse rotation to complete MSK reverse mapping:

[0071] r(n)=R 1 (n)·(-i) n (2)

[0072] =I(n)+i·Q(n)

[0073] In formula (2), n=1, 2,..., N, N represents the data length, ...

Embodiment 2

[0103] The synchronization method of the minimum frequency shift keying modulation system proposed by the present invention includes the following processes:

[0104] 201. It is the same as step 101 in embodiment 1.

[0105] 202. Data preprocessing: restore the received baseband data to ideal MSK mapped data. At time k, take the received baseband data R at intervals 1 The in-phase component I, the quadrature component Q of and the hard decision to get r 1 ’(M), the interval is the received baseband data R 1 The quadrature component Q, the in-phase component I and the hard decision to get r 2 ’(M), the value length is J;

[0106] Optionally, the hard decision method is:

[0107]

[0108]

[0109] Optionally, the hard decision method may also be:

[0110]

[0111]

[0112] In formulas (10)(11)(10')(11'), m=k, k+1,..., k+J-1, and J is the training sequence length.

[0113] Restore to ideal MSK mapped data 1 ’(M), r 2 '(M) is no longer a pure real number, but a pure real number and a pure i...

Embodiment 3

[0140] The invention provides a minimum frequency shift keying modulation system synchronization device, such as Figure 5 As shown, it includes a data receiving module, a phase reverse rotation module, a real and imaginary number module, a hard decision module, a receiving training sequence module, a bipolarization module, a sliding correlation module, a calculation decision threshold module, and a synchronization decision module;

[0141] The data receiving module is used to receive and save the single speed data received by the baseband;

[0142] The phase anti-rotation module is used to complete the MSK anti-mapping function;

[0143] The real and imaginary number fetching module is used to read the real and imaginary data of the data r; its specific implementation is as described in formula (2);

[0144] The hard decision module is used to complete the real part and imaginary part data after reverse rotation of the phase, and decide whether it is 1 or -1 according to whether it is...

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Abstract

The invention relates to the field of mobile communication, particularly to a synchronization method and a device for an MSK modulation system. The method includes recovering received base band data to data Dmsk1 before MSK mapping or data Dmsk2 after the MSK mapping; performing slipping correlation on the data Dmsk1 and training sequences after bipolarization, or performing slipping correlation on the data Dmsk2 and bipolarized training sequences after bipolarization and the MSK mapping; and finishing the synchronization process when a correlation value is larger than a judgment threshold, otherwise, repeating the process. According to the method and the device, not only the synchronization success rate under a low signal to noise ratio can be improved substantially, but also pure real number operations can be achieved in the process, and the method and the device are particularly suitable for digital signal processing or hardware accelerators.

Description

Technical field [0001] The present invention relates to the field of mobile communication, and in particular to a method and device for synchronization of minimum frequency shift keying (Minimum Shift Keying, MSK) and Gaussian-filtered Minimum Shift Keying (GMSK) modulation systems. Background technique [0002] MSK modulation and GMSK modulation are constant-envelope continuous-phase modulation methods, which are particularly suitable for use in nonlinear band-limited channels, because the sidelobes of the power spectrum of the continuous-phase modulation signal attenuate fast, while the constant-envelope modulation signal can be used for efficient Class C Power amplifier. The GMSK modulation method is to add a Gaussian low-pass filter before the MSK modulation, so that the power spectrum sidelobe attenuates faster, and is widely used in the Global System for Mobile Communications (GSM) system. [0003] The GMSK modulation process is as figure 1 As shown, the original data b(n)∈{...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/156H04L25/03
Inventor 吴广富王茜竹杨志伟
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD