Telefonaktiebolaget Lm Ericsson (Publ)

Johan Backman

Thomas Lindqvist

Stefan Hangkansson

Jan M&aring;rtensson

The present invention relates generally to the detection of bits which are protected by repetition, and which, along with their repetitions, have associated soft values available which give a measurement of the reliability of their received values. In particular, the present invention may be used in speech encoding in the GSM mobile communications system, and more particularly to the detection of those class 2 bits called pulse bits which are not protected with channel coding. In enhanced full rate (EFS) transmission in GSM there are 4 bits called pulse bits. These pulse bits are duplicated twice, giving three bits for each original bit, for a total of twelve pulse bits. These bits have associated soft values, a probability measure of their reliability, that are produced by the equalizer. These associated soft values are then used in the present invention to improve detection of these pulse bits over the state of the art which detects the pulses bits only using a majority decision among the 3 bits generated, without using their associated soft values.

Bit detection method in a radio communications system

A method and system for combining signals in a receiver employing antenna diversity. If the interference exceeds a predetermined threshold, interference rejection combining (IRC) is used. If the interference does not exceed the predetermined threshold, maximum ratio combining (MRC) is used. The diversity combining technique can be selected, and the signals combined every burst, half-burst, or other suitable interval.

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Stockholm, Sweden

Johan Backman