Star loading exchanging method based on OFDM and cross layer design

A cross-layer design and satellite-borne technology, applied in the field of satellite communication, can solve the problems of poor adaptability, achieve the effect of improving spectrum utilization law, reducing mutual interference, and realizing statistical multiplexing

Inactive Publication Date: 2008-08-27
TSINGHUA UNIV
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Problems solved by technology

Satellite ATM, satellite IP, or satellite MPLS exchange can realize the statistical utilization of spectrum resources, but they are all related to the specific communication system. If the ground adopts new technologies to build advanced systems to meet new communication service requirements, the on-board system will also Must change, poor adaptability

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  • Star loading exchanging method based on OFDM and cross layer design
  • Star loading exchanging method based on OFDM and cross layer design
  • Star loading exchanging method based on OFDM and cross layer design

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[0121] Table 1 Simulation parameters-1

[0122] Satellite uplink bandwidth

[0123] Figure 8 Under the condition of the same transmission power and the same transmission rate, the bit error rate performance comparison of the receiving end when the modulation system of each subcarrier is adaptively configured is compared with that of the receiving end when the modulation system of each subcarrier is fixedly configured. It can be seen that the bit error rate of the modulation system with adaptive configuration of each subcarrier is significantly improved than that of the modulation system with fixed configuration of each subcarrier.

[0124] Figure 9 Given the same bit error rate (0.001) requirements and the same transmission power, the transmission rate that can be achieved when the modulation system of each subcarrier is set adaptively and the transmission rate that can be achieved when the modulation system of each subcarrier is fixed is set Transfer rate compar...

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Abstract

The invention belongs to the satellite spaceborne switching technical field and relates to the spaceborne switching method based on the OFDM and the cross-layer design. The method includes that each spot-beam on the satellite and each corresponding ground gateway adopt the OFDM technique to process the satellite-ground uplink and downlink business transmission; each ground gateway determines the modulation mode of each sub-carrier in the spot-beam satellite-ground uplink and distributes the sub-carriers for each satellite-ground uplink business, and modulates all sub-carriers to OFDM signals which are transmitted to the satellite; the satellite processes sub-carrier separation and switching towards each OFDM signal of the spot-beam satellite-ground uplink, determines the modulation mode of each sub-carrier of the spot-beam satellite-ground downlink and distributes the sub-carriers for each satellite-ground downlink business, and modulates all sub-carriers to OFDM signals which are transmitted to the corresponding ground gateways. The spaceborne switching method can realize the statistical multiplexing of the spectrum resources and have no correlation with the concrete communication system so that the method has good adaptability and provides the transmission business with QoS guarantee.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a satellite on-board switching technology based on OFDM and cross-layer design. Background technique [0002] Satellite communication has become an important means of international and domestic communication due to its advantages of large capacity, suitability for various services, wide coverage area and high communication quality. The frequency spectrum of the GEO system begins to transition from the C and Ku bands to the higher-capacity Ka-band. The Ka-band synchronous satellite network generally uses the link between the satellite and the ground to form a digital beam network, generating multiple spot beams to cover different areas on the ground. This is Because the free-space propagation attenuation and rain attenuation loss of the Ka-band signal are relatively large, reducing the beamwidth can increase the effective isotropic radiated power (EIRP)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04L27/26
Inventor 党军宏晏坚曹志刚
Owner TSINGHUA UNIV
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