Multiplex communications – Wide area network – Packet switching
Patent
1991-06-27
1993-11-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375 14, 375 94, 375102, 375100, H04J 316, H03H 730
Patent
active
052630269
ABSTRACT:
The present invention provides for an equalization method that forms the nucleus of a receiver for digital cellular mobile telephones. A number of distinct aspects of the design are considered novel, including non-real time operation that permits and exploits "time-reversed" equalization to significantly enhance bit error rate performance. The present invention employs the use of a maximum likelihood sequence estimation process. It uses variable coefficient least mean square tracking during estimation of the transmission channel's impulse response. It also employs the use of integrated symbol timing adjustment and carrier tracking algorithms. Time-reversed operation further enhances performance and permits implementation with reasonable complexity of a standards compliant mobile receiver.
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Parr Michael I.
Vishwanath T. G.
Watson John L.
Denson-Low Wanda K.
Hughes Aircraft Company
Lindeen III Gordon R.
Nguyen Chau T.
Olms Douglas W.
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