SC-OFDMA-based satellite mobile communication system for forward link
A SC-OFDMA, satellite mobile communication technology, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve the problems of reducing spectrum utilization, high implementation complexity, etc., to reduce multi-access interference between users , the effect of improving system power efficiency
Active Publication Date: 2013-01-30
SHANGHAI TSINGSHEN TECH DEV CO LTD
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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
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[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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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. Power efficiency, reduce co-channel interference between cells, and provide users with high-quality mobile communication services. Background technique [0002] The satellite mobile communication system has wide coverage characteristics, and the user's mobility is not affected by the ground infrastructure, which makes up for the shortage that the ground mobile communication system is concentrated in densely populated areas and traffic arteries. The satellite mobile communication system does not depend on the local ground infrastructure. When some areas are damaged by man-made or natural disasters, the satellite mobile communication system can play a prominent role. [0003] The widely accepted OFDM (Orthogonal Frequency Division Multiplexing) technology in the ne...
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IPC IPC(8): H04B7/185H04L27/26H04L25/03
Inventor 匡麟玲吴胜陆建华
Owner SHANGHAI TSINGSHEN TECH DEV CO LTD