Pulse or digital communications – Repeaters – Testing
Patent
1996-11-14
1999-12-21
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375206, 375343, 36472803, H04B 1500, H04K 100, H04L 2730
Patent
active
060058870
ABSTRACT:
The disclosure presents a number of reduced complexity architectures for despreading direct sequence spread spectrum communications signals. In a first despreading architecture for a sequence removal unit, received chip-spaced complex samples are negated in accordance with the processed phase of a complex spreading sequence. Furthermore, the in-phase and quadrature phase sample values are switched for each other in accordance with the processed phase. In a second despreading architecture, in a sequence removal unit, received chip-spaced complex samples are processed in the logarithmic domain, with the phase of the complex spreading sequence added to the detected phase, and the resulting complex signal then converted back to Cartesian coordinates. In a third despreading architecture for a correlator, sequence removal and correlation are performed in the logarithmic domain with the amplitudes and phases for the resulting complex signal arithmetically averaged and then converted back to Cartesian coordinates. architecture also for a correlator, sequence removal and correlation are performed in the logarithmic domain using circular averaging. In a fifth despreading architecture also for a correlator, wherein multiple component sequences are combined together to form an overall sequence, and wherein one of the multiple component sequences is shared by all channels, a common sequence removal is provided for removal of the shared sequence from all channels. The resulting signals are then sent to a plurality of individual correlators for removal of channel specific sequences.
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Bottomley Gregory E.
Chennakeshu Sandeep
Dent Paul W.
Ramesh Rajaram
Ericcsson, Inc.
Pham Chi H.
Webster Bryan
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