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A soft handoff method for laser and microwave hybrid communication

A hybrid communication and soft handover technology, applied in the wireless optical field, can solve the problems of low utilization of system resources and simple scheme, and achieve the effect of stable performance and improved link utilization.

Active Publication Date: 2022-06-21
XIAN UNIV OF TECH
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Problems solved by technology

Hard-handover FSO / RF systems usually use FSO as the main link and the RF link as the backup, and automatically switch according to the threshold detection information of the FSO main link to select a single link for transmission. The solution is simple but the system resource utilization is low

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  • A soft handoff method for laser and microwave hybrid communication
  • A soft handoff method for laser and microwave hybrid communication
  • A soft handoff method for laser and microwave hybrid communication

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Embodiment Construction

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In a soft switching method for laser and microwave hybrid communication of the present invention, for the FSO communication link, it is assumed that x FSO , y FSO are the input modulated signal and the received signal, respectively, then the channel model can be expressed as

[0033] y FSO =A 1 h 1 nx FSO +n 1 (1)

[0034] Among them, A 1 represents the channel attenuation; h 1 represents the fading caused by atmospheric turbulence; η represents the photoelectric detection efficiency; n 1 Represents the additive white Gaussian noise of the laser atmospheric channel.

[0035] For microwave RF links, x RF Indicates the sending signal of the originator, then the receiving signal y RF can be expressed as

[0036] y RF =A 2h 2 x RF +n 2 (2)

[0037] Among them, A 2 represents the channel attenuation; n 2 Represents the ...

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Abstract

The invention discloses a soft handover method for laser and microwave hybrid communication, which is specifically implemented according to the following steps: step 1, calculating the soft handover threshold and model parameters of the FSO / RF hybrid link; step 2, dividing the interval according to the threshold The average packet loss rate of the FSO link and the RF link can be obtained separately, and then the average packet loss rate of the mixed link can be obtained according to the average packet loss rate of the two links, and then the mixed link is coded and modulated to determine The ratio of FSO link and RF link transmission; Step 3. After obtaining the mixed packet loss rate during the first transmission, adjust the transmission ratio of FSO link and RF link to obtain the average packet loss rate with retransmission and the average number of transmissions, use the convex optimization method to optimize the average number of transmissions, and obtain the optimal mutual cooperative retransmission ratio ψ 1 and ψ 2 , to complete the soft handover of laser and microwave hybrid communication. It has the characteristics of high system availability and stable transmission performance.

Description

technical field [0001] The invention belongs to the field of wireless optical technology, and relates to a soft switching method for laser and microwave hybrid communication. Background technique [0002] Combining the advantages of free space optical (FSO) communication and traditional microwave radio frequency (RF) communication, FSO / RF hybrid link networking technology has broad application prospects. At present, the transmission modes of FSO / RF hybrid systems mainly include hard handover and soft handover. Hard-switched FSO / RF systems usually use FSO as the main link and the RF link as the backup. According to the threshold detection information of the FSO main link, automatic switching is performed to select a single link for transmission. The scheme is simple but the system resource utilization rate is low. The soft handover FSO / RF hybrid communication system adopts the mode of dual-link matching transmission, which can make full use of the advantages of dual-link res...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/18H04B10/112
CPCH04L1/0003H04L1/0061H04L1/1812H04B10/112
Inventor 邵军虎江娜杜旭晓
Owner XIAN UNIV OF TECH