Multi-symbol detecting and symbol synchronizing method based on CPM (critical path method) modulation

A technology of multi-symbol detection and symbol synchronization, applied in the field of symbol synchronization and multi-symbol detection and symbol synchronization based on CPM modulation, can solve the problems of demodulation threshold effect and low power utilization rate.

Active Publication Date: 2011-09-14
CHONGQING JINMEI COMM
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Problems solved by technology

[0008] With the continuous improvement of CPM modulation data transmission rate and transmission distance, its demodulation threshold effec...

Method used

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  • Multi-symbol detecting and symbol synchronizing method based on CPM (critical path method) modulation
  • Multi-symbol detecting and symbol synchronizing method based on CPM (critical path method) modulation
  • Multi-symbol detecting and symbol synchronizing method based on CPM (critical path method) modulation

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the multi-symbol detection and symbol synchronization method based on CPM modulation of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0048] Assume that the packet data length is N, the number of samples in a single symbol period is R=8, (approximate integers are taken when it is not an integer multiple), h=0.7, the sampling clock is f_clk, the symbol rate is f_symbol, and the bit width of the DCO accumulator is 32 bits.

[0049] 1) Generate M sets of local likelihood detection sequences ml_s from formulas (6) and (7) 1 (t), ml_s 0 (t), and quantify it.

[0050]

[0051] Use 16 bits for quantization, 1 integer, 15 decimals, expand 32768 ...

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Abstract

The invention discloses a multi-symbol detecting and symbol synchronizing method based on CPM (critical path method) modulation. The arithmetic comprises the following steps: determining the starting time of receiving the baseband signal symbol so as to carry out multi-symbol detection treatment; generating local likelihood detecting codes; adopting a single-symbol cycle lead-lag likelihood detection arithmetic to extract phase discrimination information; carrying out clock regeneration by a loop filter circuit; controlling the lead-lag likelihood detection circuit by the regeneration clock, thus achieving the aim of completing high-quality symbol synchronization. The method has the following effective technical effects: the method is based on the maximum likelihood detection so as to ensure the synchronous performance under the low signal-to-noise ratio condition; the time window of the likelihood detection of symbol synchronization is a symbol cycle, and the likelihood detection matching baseband has simple waveform, so that the engineering is convenient to realize.

Description

technical field [0001] The invention relates to a symbol synchronization technology in the wireless communication field, in particular to a CPM modulation-based multi-symbol detection symbol synchronization method. Background technique [0002] In the field of wireless communication, continuous phase frequency shift keying CPM modulation has constant envelope characteristics, anti-polarization and multipath fading, and anti-phase interference capabilities. At the same time, non-coherent reception can be used for reception, so it has been widely used. Typical applications include GSM Mobile communication systems, military radio stations, satellite communications and launch vehicle range telemetry, etc. [0003] The mathematical expression of the CPM modulated signal can be expressed as [0004] s ( t ) = cos [ 2 π f 0 t + ...

Claims

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Application Information

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IPC IPC(8): H04L7/033H04L27/22
Inventor 陶小鱼曾纪肖宏
Owner CHONGQING JINMEI COMM
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