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Pilot signal detection method and device and optical module

A pilot signal and detection method technology, applied in the field of signal demodulation, can solve the problems of increasing the cost of optical modules and hardware area, complex hardware or software processing, poor anti-noise performance, etc., to achieve improved recognition accuracy and fast recognition speed , High effect of anti-noise performance

Inactive Publication Date: 2020-04-21
CHENGDU SUPERXON COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The demodulation of the amplitude modulation signal in the prior art can use envelope detection, but the envelope detection requires an additional envelope detection circuit (diodes, resistors, capacitors, etc.), and the anti-noise performance is poor
In addition, coherent detection can also be used for ASK and FSK modulated signals. Although the coherent detection performance is good, the hardware or software processing is complicated, which will increase the cost of the optical module and the hardware area.

Method used

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  • Pilot signal detection method and device and optical module
  • Pilot signal detection method and device and optical module
  • Pilot signal detection method and device and optical module

Examples

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Effect test

example 1

[0053] When the first level is a high level, S102, counting the representative value of the pulse number of the digital pulse signal within a fixed time period, including: counting the number of the first level; S103, the The identifying the bit signal carried by the pilot signal according to the representative value of the number of pulses includes: judging whether the pilot signal carries bit 1 or bit 0 according to the quantity of the first level. For example, the judging whether the pilot signal carries bit 1 or bit 0 according to the number of the first levels includes: when the number of the first levels is equal to M1 within the fixed time length, then The signal carried by the pilot signal is bit 1, and when the number of the first level within the fixed time length is M2, the signal carried by the pilot signal is bit 0; wherein, M1 and M2 are both Integer greater than or equal to zero, M1 is not equal to M2.

[0054] The following briefly introduces the principle of ...

example 2

[0058] S102, the counting the representative value of the number of pulses of the digital pulse signal within a fixed time length includes: counting the number of transition edges of the digital pulse signal to obtain the number of transition edges; S103, the The identifying the bit signal carried by the pilot signal according to the representative value of the number of pulses includes: judging whether the pilot signal carries bit 1 or bit 0 according to the number of transition edges. For example, the determining whether the pilot signal carries bit 1 or bit 0 according to the number of transition edges includes: when the number of transition edges within the fixed time length is equal to L1, then the The signal carried by the pilot signal is bit 1, and when the number of transition edges in the fixed time length is L2, the signal carried by the pilot signal is bit 0; wherein, L1 and L2 are both greater than or An integer equal to zero, L1 is not equal to L2, and the transit...

example 3

[0064] like Image 6 As shown, when the signal-to-noise ratio is relatively low, the jitter of the amplitude modulation signal ASK / frequency modulation signal FSK will be caused due to the influence of noise (for example Image 6 exhibits the amplitude jitter of the ASK signal), such that image 3 The number of pulses of the digital pulse signal output by comparator 300 false triggering will change (for example Image 6 The digital pulse signal shown), which in turn leads to the demodulation of the modulated signal according to whether the absolute value of the number of pulses counted within a fixed length of time is equal to one of the two values ​​(for example, N and M involved in the introduction of the above principles) In order to further improve this technical defect, the embodiment of the present application also provides a pilot signal detection method. In S102 of the pilot signal detection method, the digital pulse signal is counted within a fixed period of time. T...

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PUM

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Abstract

The embodiment of the invention provides a pilot signal detection method and device and an optical module, and the method comprises the steps: carrying out digitalization of a pilot signal, and obtaining a digital pulse signal; within a fixed time length, counting a pulse number representation value of the digital pulse signal, with the pulse number representation value comprising the pulse number or the jump edge number, and the jump edge comprising a rising edge or a falling edge; and identifying a bit signal carried by the pilot signal according to the pulse number representation value, and completing pilot signal detection. According to the embodiment of the invention, an analog ASK or FSK signal is converted into a digital pulse signal by adopting a comparator; and then the signal processing unit performs simple statistical judgment on related parameters of the number of the digital pulse signals in a digital domain, so that bit information carried by the original ASK or FSK signals can be identified, and a circuit is simple in implementation structure and high in anti-noise performance.

Description

technical field [0001] The present application relates to a signal demodulation method, in particular to a pilot signal detection method, device and optical module. Background technique [0002] The demodulation of the amplitude modulation signal in the prior art can use envelope detection, but the envelope detection requires an additional envelope detection circuit (diodes, resistors, capacitors, etc.), and the anti-noise performance is poor. In addition, coherent detection can also be used for ASK and FSK modulated signals. Although the coherent detection performance is good, the hardware or software processing is complicated, which will increase the cost of the optical module and the hardware area. Contents of the invention [0003] The purpose of the embodiment of the present application is to provide a pilot signal detection method, device, and optical module. The embodiment of the present application uses a comparator to convert the analog ASK or FSK signal into a di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69H04B14/04
CPCH04B10/695H04B14/042
Inventor 罗小东陈真
Owner CHENGDU SUPERXON COMM TECH CO LTD