Star loading exchanging method based on OFDM and cross layer design

A cross-layer design, space-borne technology, applied in the field of satellite communication, can solve problems such as poor adaptability
CN101252384BInactive Publication Date: 2012-02-22TSINGHUA UNIV
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2012-02-22
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More