Maximum likelihood sequence estimation based equalization...

Details Maximum likelihood sequence estimation based equalization... Maximum likelihood sequence estimation based equalization...

H - Electricity

04

B

H04B 7/26 (2006.01) H04B 1/16 (2006.01) H04L 7/02 (2006.01) H04L 25/02 (2006.01) H04L 25/03 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2068964

MAXIMUM LIKELIHOOD SEQUENCE ESTIMATION BASED EQUALIZATION WITHIN A MOBILE DIGITAL CELLULAR RECEIVER 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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