Fixed length dual-amplitude pulse interval modulation method for wireless optical communication system

A technology of pulse interval modulation and wireless optical communication, which is applied in the transmission system, optical fiber radio, electromagnetic wave transmission system, etc., to achieve the effect of improving symbol synchronization ability, easy engineering implementation, improving bandwidth utilization and transmission capacity

Inactive Publication Date: 2009-09-16
程刚
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Problems solved by technology

[0004] The purpose of the present invention is to appropriately shorten the symbol length, improve bandwidth efficiency and transmission capacity, and solve the problems of redundancy or overflow in the buffer during demodulation, and has built-in symbol synchronization capability

Method used

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  • Fixed length dual-amplitude pulse interval modulation method for wireless optical communication system
  • Fixed length dual-amplitude pulse interval modulation method for wireless optical communication system
  • Fixed length dual-amplitude pulse interval modulation method for wireless optical communication system

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Embodiment

[0029] Design requirements: Construct FLDA-PIM modulation symbols to transmit different binary information through the change of the marked pulse amplitude and the change of the distance between the initial pulse and the marked pulse.

[0030] Design analysis: According to the design requirements, referring to the above-mentioned technical scheme, the length of each symbol in FLDA-PIM is fixed, and contains a start pulse and a marker pulse. Among them, the start pulse is fixed from the first time slot, and its width and amplitude are fixed; the width of the identification pulse is fixed, but the amplitude and position must be determined according to the decimal value corresponding to the transmitted binary array, such as figure 1 As shown, the specific implementation process is as follows:

[0031] ①Transmit the binary information source in groups of M=4 bits. Among them, s 1 Indicates that the binary array passed by the first character is 0010, and its corresponding decimal...

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Abstract

The invention discloses a fixed length dual-amplitude pulse interval modulation method for a wireless optical communication system. In the method, the length of each modulation symbol is fixed, and each modulation symbol comprises an starting pulse and a marker pulse; the starting pulse is fixedly started from a first time slot, and has fixed amplitude and width; and the width of the marker pulse is fixed, but the amplitude and the position of the marker pulse are determined by a denary value k corresponding to a bit array transmitting M-bit binary information. The method can shorten the length of symbols, improve bandwidth efficiency and transmission capacity and solve the problems of possible redundancy or overflow of a buffer in the modulation process and the like, and has the capacity of synchronizing built-in symbols at the same time.

Description

technical field [0001] The invention relates to a modulation method of a wireless optical communication system, in particular to a method of digital pulse modulation technology. Background technique [0002] Due to the requirements of human eye safety and portability of mobile devices, the transmitted optical power of wireless optical communication is greatly limited. Under certain conditions of noise and average signal power, to reduce the bit error rate, it is necessary to increase the ratio of signal peak power to average power, and the improvement of power efficiency is usually obtained by increasing the bandwidth requirement. When the shot noise is the main noise, the signal-to-noise ratio is proportional to the area of ​​the photodetector, so in practice, the largest receiving detector should be selected as much as possible. However, the larger the area of ​​the detector, the larger the capacitance, which limits the system bandwidth. Therefore, there is a problem of ...

Claims

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Application Information

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IPC IPC(8): H04B14/02H04B10/12H04B10/2575
Inventor 程刚王红星刘锡国赵志勇
Owner 程刚
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