Multiple access method

Details Multiple access method Multiple access method

1991-11-21

1992-12-08

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

H04N 100

Patent

active

051704129

ABSTRACT:
In a multiple access method for the simultaneous exchange of several data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) among several participants of a transmission system, various data streams ({B.sub.1,m }, {B.sub.2,m }, {B.sub.3,m }) with the same spread sequence (s[.]) are expanded to a corresponding DSSS signal ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}. During transmission, the various DSSS signals ({B.sub.1,m s[.]}, {B.sub.2,m s[.]}, {B.sub.3,m s[.]}) 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.sub.-- 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.

REFERENCES:
W. C. Wong et al. "Synchronous vs Asynchronous CDMA for Fiber Optic LANS Using Optical Signal Processing", Nov. 1989, pp. 1012-1016.
de Graauw et al. "Pseudo-Random Binary Sequeces for Multiplex Codes", Dec. 1970, pp. 2658-2660.
Birk et al. "Code-Assignment Policies for Multi-Receiver Nodes in CDMA Packet Radio Networks", Apr. 1986.

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