IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0795478
(1991-11-21)
|
| 우선권정보 |
CH-0003702 (1990-11-22) |
|
발명자
/ 주소 |
- Massey James L. (Zurich CHX)
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| 출원인 / 주소 |
- Ascom Tech AG. (Bern CHX 03)
|
| 인용정보 |
피인용 횟수 :
52 인용 특허 :
0 |
초록
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In a multiple access method for the simultaneous exchange of several data streams ({B1,m}, {B2,m}, {B3,m}) among several participants of a transmission system, various data streams ({B1,m}, {B2,m}, {B3,m}) with the same spread sequence (s[.]) are expanded to a corresponding DSSS signal ({B1,ms[.]},
In a multiple access method for the simultaneous exchange of several data streams ({B1,m}, {B2,m}, {B3,m}) among several participants of a transmission system, various data streams ({B1,m}, {B2,m}, {B3,m}) with the same spread sequence (s[.]) are expanded to a corresponding DSSS signal ({B1,ms[.]}, {B2,ms[.]}, {B3,ms[.]}. During transmission, the various DSSS signals ({B1,ms[.]}, {B2,ms[.]}, {B3,ms[.]}) are heterodyned to a single incoming signal. For detecting the various data streams in a receiver, the incoming signal is filtered in a filter that is inverse with respect to the joint spread sequence (s[.]). In order to permit reliable detection, heterodyning takes place in each case so that the spread sequence intervals pertaining to different data streams are chronologically shifted with respect to one another by a given minimum value (delta－T). The invention provides a multiple access method combining therein the advantages of TDMA and CDMA. In particular, an almost complete separation of the users is possible without requiring the precision of synchronization customary in case of TDMA.
대표청구항
▼
Multiple access method for the simultaneous exchange of several data streams among several participants of a transmission system, wherein various data streams with the same spread sequence are expanded to a corresponding DSSS signal, and the various DSSS signals are superimposed during transmission
Multiple access method for the simultaneous exchange of several data streams among several participants of a transmission system, wherein various data streams with the same spread sequence are expanded to a corresponding DSSS signal, and the various DSSS signals are superimposed during transmission to a single incoming signal, characterized in that, for detecting the different data streams in a receiver, the incoming signal is filtered in a filter that is inverse with respect to the joint spread sequence, and that the superposition takes place in such a way that the spread sequence intervals pertaining to different data streams are time-shifted with respect to one another by a predetermined minimum value.
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