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SC-OFDMA-based satellite mobile communication system for forward link

A technology of SC-OFDMA and satellite mobile communication, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve problems such as high implementation complexity, reduce spectrum utilization, and reduce multiple access interference between users , Improve the effect of system power efficiency

Active Publication Date: 2010-08-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional FDMA (Frequency Division Multiple Access) technology uses filters and NCOs (Numerically Controlled Oscillators) to realize the transmission and reception of different users on different carriers. A certain guard interval must be reserved between carriers, which reduces the spectrum utilization. The receiver also needs a large number of filters to separate the user signal, which has high implementation complexity

Method used

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  • SC-OFDMA-based satellite mobile communication system for forward link
  • SC-OFDMA-based satellite mobile communication system for forward link
  • SC-OFDMA-based satellite mobile communication system for forward link

Examples

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described as follows:

[0050] The forward link proposed by the present invention is based on the SC-OFDMA satellite mobile communication system as attached figure 1 As shown, including gateway stations adopting SC-OFDMA system, satellite transponders and terminals adopting SC-OFDMA system.

[0051] For realizing the purpose of the present invention, gateway station of the present invention has SC-OFDMA modulator, and its structural composition is as attached figure 2 shown. Among them, precoding realizes constellation mapping, DFT extension and subcarrier mapping. Constellation mapping can be realized by table lookup, DFT can be quickly realized by FFT, and the realization of subcarrier mapping only needs to divide the data symbols of each channel according to the assigned subcarrier sequence number Enter IFFT. Available spectrum resources are divided into several su...

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Abstract

The invention discloses an SC-OFDMA-based satellite mobile communication system for a forward link, which belongs to the field of satellite mobile communication. The SC-OFDMA-based system for the forward link is characterized in that single carrier signals of a user are mapped to different sub-carriers through DFT (discrete Fourier transform) or FFT (fast Fourier transform) and then subjected to IFFT (inverse fast Fourier transform) to realize orthogonal transmission of each user signal so as to improve the utilization rate of high frequency spectrum resources and reduce the peak-to-average power ratio of the satellite forward link; and in the multi-beam-based satellite mobile communication system, different sub-carrier groups are distributed to the users in a beam overlapped area according to the beams belonging to the users so as to reduce the co-channel interference between the low beams and fulfill the aim of improving the capacity of the system.

Description

Technical field [0001] The forward link satellite mobile communication system based on SC-OFDMA (Single Carrier Orthogonal Frequency Division Multiple Access) belongs to the field of satellite mobile communication. It mainly solves the problem of high peak-to-average power ratio of the forward link of the satellite mobile communication system and improves the system's efficiency. Power efficiency, reducing co-channel interference between cells, and providing users with high-quality mobile communication services. Background technique [0002] Satellite mobile communication systems have extensive coverage characteristics, and users' mobility is not affected by ground infrastructure, which makes up for the shortcomings of ground mobile communication systems that are concentrated in densely populated areas and traffic arteries. The satellite mobile communication system does not rely on local ground infrastructure. When some areas are damaged by man-made or natural disasters, the...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04L27/26H04L25/03
Inventor 匡麟玲吴胜陆建华
Owner TSINGHUA UNIV
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