Pulse or digital communications – Repeaters – Testing
Patent
1992-06-15
1994-05-10
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375 53, 375 57, 375 60, 375 67, 375 85, 375 94, 332103, 329304, H04L 512
Patent
active
053115538
ABSTRACT:
An optimum communication system employs an encoder coupled to a mapper and two parallel branches, each branch having a transmit filter a digital-to-analog converter, a low pass filter and a modulator coupled in series. Both modulators are coupled to a summer which provides an rf signal to a transmit antenna. A second antenna is coupled to a first down converter, an IF filter, a second down converter, an analog-to-digital converter and a decoder. The encoder is optimized by choosing a desired minimum Euclidean distance between symbols multiplied by the average to peak transmit power ratio (MPDR), an encoder alphabet and a number of constellation points. All possible encoder states and all possible input symbols are permutated to result in a plurality of encoder sets. The minimum distance between coded symbols and a P.sub.ib /P.sub.ab power ratio for each code set is determined. The encoder is adapted to output an encoder set U having a largest P.sub.ib /P.sub.ab power ratio having a large adjacent channel interference protection ratio. In an alternative embodiment, a minimum P.sub.ib /P.sub.ab power ratio (MPR) is chosen. The encoder is adapted to output an encoder set U having the largest minimum distance between coded symbols multiplied by the average to peak transmitted power ratio, that also has a P.sub.ib /P.sub.ab ratio that exceeds MPR.
REFERENCES:
patent: 5164963 (1992-11-01), Lawrence et al.
Abstract--Norihito Kinoshita and Seiichi Sampei (Authors), "Method of Rejecting Adjacent Channel Interference using an Adaptive Equalizer", May 1988.
Anderson John B.
Chennakeshu Sandeep
Hassan Amer A.
Ramesh Rajaram
Bocure Tesfaldet
General Electric Company
Kuntz Curtis
Snyder Marvin
Zale Lawrence P.
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