Method for multi-user transmission in ultra-short wave OFDM mobile multimedia sensor network TDMA
A mobile multimedia and sensor network technology, applied in the field of time division multiple access multi-user transmission of ultra-short wave orthogonal frequency division multiplexing mobile multimedia sensor network, can solve the problem of poor diffraction ability, poor transmission effect, and no simultaneous transmission of multiple images. and other problems to achieve a good transmission effect
Inactive Publication Date: 2010-02-10
江苏锦华物联科技有限公司
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[0008] The purpose of the present invention is to provide a method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission, which solves the problem of poor transmission effect of the existing mobile multimedia sensor network, and does not have the simultaneous transmission of multiple images and the entanglement in the urban environment. poor shooting ability
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] A method for TDMA multi-user transmission of an ultrashort wave OFDM mobile multimedia sensor network. The transmission system is provided with 9 base stations and 4 user terminals. Each base station is connected to the control center through a dedicated optical fiber, and the second pulse of GPS is used for timing. A regularly repeated frame structure in the time domain of the wireless channel of each base station is divided into 5 time slots, the first to fourth time slots correspond to the data uploaded by the user terminals 1 to 4 to the base station, and the fifth time slot The inner base station downloads data to 4 user terminals at the same time. The downloaded data includes time information, control signaling and data. In the 1st time slot, the 25th time slot, the 30th time slot, the 35th time slot, the 40th time slot and the 45th time sl...
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The invention relates to an ultrashort wave OFDM mobile multimedia sensor network TDMA multi-user transmission method. A transmission system has a working frequency of 300-400MHz. The channel width is8MHz; N base stations and M user ends are arranged; each base station is connected with a control center by using optical fiber; and time accounting is done by GPS. A frame structure, which is positioned in every base station wireless channel time domain and which repeats regularly, is divided into M+1 time slots; the 1 to M time slots correspond to the 1 to M user ends and uploads the data to the base station; the data from N base stations in M+1 time slots are downloaded to the M user ends at the same time. The transmission rate of uplink data of the user end to the base station is greaterthan 750kbps / channel; and the transmission rate of downlink data to the user end is greater than 30kbps / user. With the scheme, the invention has the advantages that transmission effect is good, and has the ability of real-time transmission of multi-channel images and diffraction capability under urban environment.
Description
technical field [0001] The invention relates to a method for multi-user transmission of ultrashort wave Orthogonal Frequency Division Multiplexing (OFDM) mobile multimedia sensor network Time Division Multiple Access (TDMA). Background technique [0002] Ultrashort wave mobile multimedia sensor network TDMA multi-user transmission system based on Orthogonal Frequency Division Multiplexing (OFDM) is a brand new wireless system developed according to user requirements based on the actual needs of long-range networks in battlefield sensing and reconnaissance, combined with police mobile image transmission applications. High-definition digital image network transmission equipment. It fully meets the needs of wireless image transmission, and is a high-power vehicle-mounted video transmission device with a certain diffraction capability. This system is widely used in battlefield reconnaissance, public security emergency command vehicle, VIP convoy monitoring, fire and armed polic...
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IPC IPC(8): H04L5/26H04L12/28H04B5/00H04B7/26
Inventor 庞瑞帆刘海涛张宏俊王营冠胡骁郑春雷
Owner 江苏锦华物联科技有限公司