St-ericsson Sa

Eric Alliot

Pierre Demaj

Fabrizio Tomatis

Ahmet Bastug

Marc Soler

Process of a finger assignment in a rake receiver for a wireless communication device comprising the following steps: &#x2014;detection () of a pilot (CPICH) and the comparison of its energy according to a first threshold value; &#x2014;detection (), on the basis of said first threshold value, of a first significant path; &#x2014;assignment () of said first significant path to a first finger of the rake receiver; &#x2014;determination () of an observation window; &#x2014;application () of a second threshold value, distinct and lower than said first value, for the detection of secondary paths; &#x2014;rake fingers assignment to secondary paths detected.

Process for assigning a finger of a rake receiver in idle mode, and apparatus for carrying out the process

Method of data processing for selectively activating, at a mobile station, a mode of communication related to VAMOS-2 technology. The method includes the steps of: receiving a first signal of a first subchannel, the first signal containing a first training sequence, and receiving a second signal of a second subchannel, the second signal containing a second training sequence, the second signal being orthogonally multiplexed with respect to the first signal, and using the first training sequence and the second training sequence to: determine a value of a parameter defining a ratio between the first subchannel power and the second subchannel power, and determine a signal to noise ratio estimation, and determine, using the parameter value and the signal to noise estimation, whether the mode of communication has to be activated.

Selective activation of VAMOS-2 mode

A method for determining a length of a message block of k bits from a length candidate set, comprising steps of: &#x2014;Selecting () a length candidate (N) among the set; &#x2014;Decoding () a received frame to form a decoded sequence that includes a message of a length equal to the length candidate (N), by a Viterbi decoder; &#x2014;Calculating () a Viterbi variable (S(N)) for this candidate (N), &#x2014;Comparing () the Viterbi variable with a threshold (&#x394;), &#x2014;Repeating the selecting (), decoding () and calculating () steps if said Viterbi variable (S(N)) is greater than the threshold (&#x394;) and if there exists an unselected length candidate among the set; &#x2014;If the Viterbi variable is greater than a best value (S), updating this best value to the Viterbi variable and updating a best length (N) to this candidate; &#x2014;Wherein the threshold (&#x394;) is initially set to a value determined according to the conditions of reception of the receiver.

Blind transport format detection depending on the conditions of reception of the signal

The invention is directed towards a method and apparatus for estimating a noise variance in a receiver of a code multiplex telecommunications system with orthogonal spreading codes, wherein respective real and imaginary parts of a sum and a difference of two estimated symbols having substantially same amplitudes are determined, and then respective minimum energy components of the determined real and imaginary parts of the sum and difference are determined. The respective minimum energy components are finally combined to obtain the noise variance. Thereby, noise variance can be estimated simply based on addition and comparison operations, which reduces complexity and processing load.

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Mouans-Sartoux, France

Eric Alliot