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Synchronization method and device for minimum shift keying (MSK) modulation system

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: 2013-04-10
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Synchronization method and device for minimum shift keying (MSK) modulation system
  • Synchronization method and device for minimum shift keying (MSK) modulation system
  • Synchronization method and device for minimum shift keying (MSK) modulation system

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Embodiment 1

[0065] A kind of MSK and GMSK modulation system synchronization method that the present invention proposes, such as Figure 4 shown, including the following process:

[0066] 101. Data reception: 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 the formula (1), n=1,2,..., N, N is the data length, and i is the imaginary number unit, and I 1 is the in-phase component, Q 1 is an orthogonal component.

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

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

[0071] r(n)=R 1 (n)·(-i) n (2)

[0072] =I(n)+i·Q(n)

[0073] In the formula ...

Embodiment 2

[0103] A method for synchronizing a 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, the received baseband data R is taken at intervals 1 The in-phase component I, the quadrature component Q and make a hard decision to get r 1 '(m), take the received baseband data R at intervals 1 Quadrature component Q, in-phase component I and 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 the formula (10)(11)(10')(11'), m=k, k+1,..., k+J-1, J is the length of the training sequence.

[0113] Data r restored to ideal MSK mapping 1 '(m), r 2 '(m) is no longer a pure real number, but a...

Embodiment 3

[0140] A minimum frequency shift keying modulation system synchronization device proposed by the present invention, such as Figure 5 As shown, it includes a data receiving module, a phase anti-rotation module, a real number and an 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 inverse rotation module is used to complete the MSK inverse mapping function;

[0143] Described getting real number and imaginary number module are used for finishing the real part and the imaginary part data of reading data r; Its concrete realization is as described in formula (2);

[0144] The hard decision module is used to complete the real part and imaginary part data after phase inverse rotation,...

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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, in particular to a minimum shift keying (MSK for short) and Gaussian-filtered minimum shift keying (GMSK for short) modulation system synchronization method and device. Background technique [0002] MSK modulation and GMSK modulation are constant-envelope continuous phase modulation methods, which are especially suitable for use in nonlinear band-limited channels, because the power spectrum sidelobe of continuous phase modulation signals decays quickly, and constant-envelope modulation signals 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 for short) system. [0003] GMSK modulation process such as figure 1 As shown, the original data b(n)∈{0, 1} undergoes differenti...

Claims

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Application Information

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