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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0781972 (1991-10-24) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 291 인용 특허 : 0 |
A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. A spread spectrum system is used with code division multiple access (CDMA) employing forward error correction coding (FECC) to enhance the effective
A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. A spread spectrum system is used with code division multiple access (CDMA) employing forward error correction coding (FECC) to enhance the effective gain and selectivity of the system. Multiple beam, relatively high gain antennas are disposed in the satellite nodes to establish a first set of cells, and by coupling the extra gain obtained with FECC to the high gain satellite-node antennas, enough gain is created in the satellite part of the system such that a user need only use a small, mobile handset with a non-directional antenna for communications with both ground nodes and satellite nodes. User position information is also available. A digital data interleaving feature reduces fading. Each transmitter includes a coder representative of its output power level. Receivers compare this code to the received signal strength and adjust their associated transmitter power output level accordingly. An inter-cell bus is formed in a super-surface node which receives signals from a plurality of cells, frequency multiplexes those signals and transmits the multiplexed signal to the plurality of cells.
A cellular communications system comprising: at least one space node having a multiple beam antenna positioned so to establish a first set of cells, each space node including means for transmitting and receiving different predetermined sets of code division multiple access coded, spread spectrum wav
A cellular communications system comprising: at least one space node having a multiple beam antenna positioned so to establish a first set of cells, each space node including means for transmitting and receiving different predetermined sets of code division multiple access coded, spread spectrum waveforms digitally modulated and incorporating forward error correction coding with the waveforms being located in a predetermined frequency band common to all space nodes; the antenna having a reflector with a multiple element feed disposed in the focal region of the reflector; at least one surface node positioned so to establish a second set of cells, each surface node including means for transmitting and receiving the predetermined sets of code division multiple access coded, spread spectrum waveforms in the predetermined frequency band; and a plurality of user units within the cells, each unit including means for communicating with each satellite node and with each surface node and being operatively responsive to a predetermined one of the sets of code division multiple access coded waveforms to thereby establish selective communication with at least one of the nodes.
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