Satellite broadcasting system

Satellite broadcasting system

  • CN 1,881,855 A
  • Filed: 07/03/1998
  • Published: 12/20/2006
  • Est. Priority Date: 07/03/1997
  • Status: Abandoned Application
First Claim
Patent Images

1. broadcasting-satellite system, the dispensing device of ground station will carry out band spectrum modulation as the broadcast singal of a plurality of channels of centre frequency and synthesize by using the different extended code of each channel with first frequency, generating the first code division multiplexing broadcast singal is the CDM broadcast singal, to carry out band spectrum modulation as the broadcast singal of a plurality of channels of centre frequency and synthesize with second frequency by using the different extended code of each channel, generate the 2nd CDM broadcast singal and send to satellite, the satellite retransmission unit that aforementioned satellite carries receives an aforementioned CDM broadcast singal and aforementioned the 2nd CDM broadcast singal, carry out frequency inverted respectively and send to service area, the receiver terminal device that is present in the aforementioned service area optionally receives an aforementioned CDM broadcast singal and the 2nd CDM broadcast singal, it is characterized in thatAforementioned satellite retransmission unit possesses:

  • Receiving element receives the CDM broadcast singal and the 2nd CDM broadcast singal that send from the dispensing device of aforementioned ground station;

    Separative element will separate at a CDM broadcast singal and the 2nd CDM broadcast singal that this receiving element receives;

    Transmitting element is sent in the CDM broadcast singal of aforementioned separative element after separated with right-hand circularly polarized wave, sends the 2nd CDM broadcast singal with left-handed circular polarized wave,Aforementioned receiver terminal device possesses;

    Polarized wave switches receiving element, optionally switch right-hand circularly polarized wave receiving mode and left-handed circular polarized wave receiving mode, receive any one CDM broadcast singal, this right-hand circularly polarized wave receiving mode receives a CDM broadcast singal that sends from aforementioned satellite retransmission unit, and this left-handed circular polarized wave receiving mode receives the 2nd CDM broadcast singal;

    The channel demodulation unit, the channel signal to expectation from the CDM broadcast singal that this polarized wave switching receiving element receives carries out demodulation.

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