Voice band multiplex transmission system
Signal transmission system featuring bidirectional transmission of different signal types over a common transmission line connecting a central unit and a plurality of terminal units
Pseudorandom word sequence synchronizer
A-point to multi-points communication system Patent #: 4901313
ApplicationNo. 538367 filed on 06/14/1990
US Classes:370/312, Message addressed to multiple destinations370/320, Code division (CDMA)370/335, Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA)375/150, Correlation-type receiver375/224, TESTING375/350, By filtering (e.g., digital)455/296Noise or interference elimination
ExaminersPrimary: Olms, Douglas W.
Assistant: Ton, Dang
International ClassH04J 003/12
AbstractA method and apparatus for immediately identifying the presence and the source of interference in a communications system. A separate identification code is superimposed on each signal transmitted from a separate transmitter. At any receiver, if an undesired signal causes interference, it can be idenified via its associated identification code. In one embodiment, spread spectrum chip sequences are used as the identification codes.