Nec Corporation

Dobrica Vasic

Thanh Ngoc Bui

Kevin Lin

Satha Sathananthan

Xinhua Wang

David Stanhope

Filip Zalio

Paul Isaac

Dominic Wong

Jiehui (Allen) Yuan

Olga Tcherviakova

Angus James MacKinnon

A decoding method decodes N received branchwords produced by a convolutional encoder using a tail-biting convolutional code. N received branchwords are in memory. Viterbi updates are performed on a sequence of branchwords. A first encoder determines a state at the end of the third block most likely to have generated the final branchword in the sequence from the best path metric. A Viterbi traceback procedure is performed from that first encoder state at the end of the third block to determine a second encoder state at the start of the third block of branchwords. A Viterbi traceback procedure is performed from that second encoder state at the start of the third block to determine a third encoder state at the start of the second block of branchwords. A derived tail-biting path is output, if the second and third encoder states are identical.

Decoding method and decoding device

The present invention relates to methods that can be used in a wireless communication system, and systems adapted to use such methods. In a preferred form the methods are useful in channel estimation in a wireless communication system using orthogonal frequency division multiplexing (OFDM). The system is provided with a control block to optimize channel estimation.

Methods relating to channel estimation

Method and apparatus for channel estimation in OFDM

A method of determining a signal quality parameter in a radio communications device includes: measuring a signal error parameter of a received signal (); comparing said measured signal error parameter to a threshold level (), and determining the signal quality parameter on the basis of a reference signal error parameter value () in the event that the measured signal error parameter value is less than the threshold level ().

Measuring received signal quality

A method of conducting soft combining of at least two received MBMS signals in a user equipment () of a radio telecommunications network (), the method including: demodulating () at least a subset of the received MBMS signals; converting (---) a floating point slot data vector to a fixed point slot data vector for each demodulated received MBMS signal; and soft combining () the fixed-point slot data vectors derived from at least two of said received MBMS signals.

MBMS soft combining

A method of operating a radio telecommunications network including, a plurality of base transceiver stations (BTSs) each transmitting on a respective transmission bandwidth, and one or more mobile terminals (MTs) each having a respective maximum reception bandwidth, defining a common multicast frequency band within the transmission bandwidth of at least a first group of BTSs of the network on which the multicast service is to be transmitted; transmitting a multicast service in the common multicast frequency band from each BTS within the first group of BTSs; and enabling each base station having a bandwidth greater than the width of the common multicast frequency band to transmit a uni-cast service in portion of its transmission bandwidth falling outside the multicast frequency band.

Delivery of multicast and uni-cast services in an OFDMA system

A cell search method for use in a mobile communication system, the method including: performing one or more identification steps for identifying timing and codes of oversampled input signals; and reducing the resolution of the oversampled input signals before performing the one or more identification steps.

Cell search method and apparatus in a WCDMA system

An automatic gain control circuit () for a direct sequence spread spectrum receiver. A discrimination unit () generates a discrimination signal error from received in-phase and quadrature base band signals, whilst multiplication unit () multiplies the discrimination signal error by a first loop gain constant during signal acquisition and a second different loop gain constant during signal tracking. A recursive integrator () then acquires an integrated AGC value from the multiplied discrimination signal error. By using two different values of loop gain, the circuit is able to alternate between a 'fast mode' during signal acquisition, and a 'slow track' mode during signal tracking.

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Victoria, Australia

Dobrica Vasic