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Improved variable code rate carrier wave synchronization Costas loop design

A carrier synchronization and code rate technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system, etc., can solve the problem that the parameter value cannot be modified in real time, and achieve the effect of improving the establishment time

Inactive Publication Date: 2016-06-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to fix the parameter value corresponding to the specific code rate into the program in advance for the existing Costas ring structure, and the defect that the parameter value cannot be modified in real time
A carrier synchronization structure based on Costas ring is proposed to solve the problem of rapid carrier synchronization under the condition of code rate change

Method used

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  • Improved variable code rate carrier wave synchronization Costas loop design
  • Improved variable code rate carrier wave synchronization Costas loop design
  • Improved variable code rate carrier wave synchronization Costas loop design

Examples

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Embodiment Construction

[0015] according to figure 1 The block diagram of the improved Costas ring carrier synchronization, the input signal expression is:

[0016] S(t)=m(t)cos(ω c +θ)(1)

[0017] where m(t) represents the baseband signal; ω c Is the center frequency of the carrier; θ is the initial phase. In this way, the input data and the two quadrature signals generated by the NCO are multiplied to obtain the mixed frequency data, and then processed by the low-pass filter and the phase detector, the error signals of the in-phase and quadrature loops are respectively:

[0018] S I (t)=m(t)cos(ω c +θ 1 )(2)

[0019] S Q (t)=m(t)cos(ω c +θ 1 )(3)

[0020] After multiplying the two error signals, the output is:

[0021] U d ( t ) = K I d K Q ...

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Abstract

The invention requests to realize a variable code rate carrier synchronization structure based on Costas ring, and belongs to the technical field of signal processing. The present invention aims at the defect that the existing Costas ring structure needs to fix the parameter value corresponding to the specific code rate inside the program in advance, and the parameter value cannot be modified in real time. Based on the analysis and research of the original Costas ring structure, a Costas ring carrier synchronization system whose parameters can be modified in real time and whose code rate is variable is designed and implemented. The system uses an external controller to dynamically calculate each parameter according to the change of the code rate, and updates to the Costas carrier synchronization loop in real time with the help of FPGA overload technology. The method can quickly realize the carrier synchronization of the variable code rate in a wide range, so it is of great significance to the subsequent signal processing.

Description

technical field [0001] The invention relates to communication signal processing of a new generation receiver, in particular to a carrier synchronization problem based on a Costas ring to realize a variable code rate. Background technique [0002] As one of the core technologies of the communication system, synchronization technology plays a vital role in the communication system and directly affects the performance of the communication system. Carrier synchronization is not only an important branch of synchronization, but also largely determines the demodulation performance of coherent demodulation systems. There are two types of carrier synchronization methods: one is the closed-loop carrier synchronization method, and the other is the open-loop carrier synchronization method. Among them, the Costas loop structure in the closed-loop carrier synchronization method has been widely used in carrier synchronization because it has a certain ability to suppress frequency shift an...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/266H04L27/2656H04L27/2657H04L2027/0065H04L2027/0069
Inventor 余翔周威刘礼跃
Owner CHONGQING UNIV OF POSTS & TELECOMM
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