Signal transmission optimization method for FDMA (Frequency Division Multiple Access) digital channelized satellite communication systems

Abstract

An optimized signal transmission loading method for FDMA (Frequency Division Multiple Access) digital channelized satellite communication systems, which belongs to the technical field of mobile wireless communication, is characterized in that in order to maximize the communication capacity of a satellite repeater, the power of ground user transmitters is first set as a maximum value, and on the basis, an operating point of the satellite repeater is one-dimensionally searched; for each possible operating point in the search range, a multi-level optimization method is used, the Lagrangian multiplier method is used for iteratively working out a gain parameter for each link, moreover, the gains of the links not meeting the requirement on the signal-to-noise ratio are rectified, and the optimal values of on-satellite channel gain parameters are obtained. The optimal parameters are used for configuring the repeater, so that the working point of an on-satellite high power amplifier is changed, and thereby the purpose of maximizing the overall communication capacity is achieved in the end. The signal transmission optimization method is suitable for broadband multi-channel gain-adjustable satellite repeater systems, particularly satellite repeater systems adopting the digital channelization technology and requiring the adjustability of the uplink transmission power of ground sides.

Description

Technical field: [0001] The invention belongs to the technical field of mobile wireless communication, and relates to a capacity optimization method for an FDMA satellite communication system. Background technique: [0002] Broadband satellite communication technology will get more and more applications in the future. The basic function of a broadband communication satellite is to provide forwarding services for widely distributed terminal equipment on the ground. Because these terminal devices have high data transmission rate requirements, in order to meet such requirements, we must improve the performance of channelization technology and switching technology in broadband satellite communications. [0003] With the continuous improvement of the working frequency band, the bandwidth of modern satellite communication is getting wider and wider, and the main bottleneck affecting communication performance has gradually shifted from bandwidth limitation to power limitation. In...

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Problems solved by technology

[0010]In the previous step, the M-dimensional inequality constraints were ignored, so in the optimal solution obtained, there may be some links whose SNR cannot meet the requirements, namely Not all can be satisfied: CIi>CIi,min

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