Abstract: A method for setting spreading code delays in RAKE receiver branches include, for instance: determining solutions for the code delays that include a code delay candidate for the branch to be processed and for in the order of delay preceding branches. The solutions maximize the sum of the signal strengths in the branch to be processed and in the preceding branches. The method also includes that the delays of the branches are selected in accordance with the last determined solution.

Abstract: The present invention relates to a method and a circuitry for estimating a spreading factor and/or data transmission rate in a communication system that employs variable data transmission rates. A received transmission signal is analyzed in order to estimate noise variances for those spreading factors that are possible for a data frame in the signal. The estimate is based on information that is determined by assuming that the smallest possible spreading factor was used for the transmission of the signal. The estimates are then scaled by predefined constants, each of the constants depending on the respective possible spreading factor. The smallest one of the scaled estimates is determined, whereafter the most probable spreading factor of the received data frame is determined based on the smallest variance estimate.

Abstract: A method for setting spreading code delays in RAKE receiver branches include, for instance: determining solutions for the code delays that include a code delay candidate for the branch to be processed and for in the order of delay preceding branches. The solutions maximize the sum of the signal strengths in the branch to be processed and in the preceding branches. The method also includes that the delays of the branches are selected in accordance with the last determined solution.

Abstract: A RAKE receiver for receiving a spread spectrum signal, the RAKE receiver comprising at least two antennas for receiving a spread spectrum signal containing several user signals, at least one delay unit for delaying the spread spectrum signal received in at least one antenna to prevent the spread spectrum signals received from the different antennas from being cancelled, an adder for combining the spread spectrum signal received in at least two antennas to form a combination signal, and a matched filter for generating a user signal combination impulse response by means of the combination signal.

Abstract: The invention relates to a reception method and a receiver to receive signals supplied from a radio path, and the signals include information and each signal which arrives at the receiver is delayed by a unique delay value. The receiver includes a filtering device and a distribution device to determine the strength of a part of a signal delayed by a certain propagation delay by several values of the propagation delay. The distribution device compares the delay differences of the received signals with each other and forms sums of the strengths of the signal parts determined by different values of the propagation delay. The distribution device selects values deviate at least by a predetermined delay difference whose sum of the strengths of the signal parts obtains the highest possible value. The receiver indicates the received information by using the signals selected above.

Abstract: An iterative Turbo decoder in which soft bits of a received signal are repetitively subjected to the process of decoding by a first decoder associated with a first encoder in the transmitter, interleaving by an interleaver associated with an interleaver in the transmitter, decoding by a second decoder associated with a second encoder in the transmitter, and deinterleaving by a deinterleaver associated with the interleaver in the transmitter. The improvement is to scale the signal after each decoding by a predetermined value in the vicinity of 0.7 to 0.8. At a signal Eb/No in the vicinity of 1.0 db., an improvement of about 0.2 db. in coding gain is attained while very little complexity is added. Decoders may be according to the max Log MAP algorithm instead of the more complex Log MAP algorithm with only slight degradation of performance.

Abstract: The invention relates to a method of channel allocation in a fixed radio link network. For each radio link to be commissioned channels, interference level measurement on each available channel of the frequency band is carried out. Based on the interference measurements, best transmission and reception channel for the link are selected. Thereafter, the radio link can be commissioned and measurements in the next radio link to be commissioned can be started. Instead of using a fixed and pre-set channel for the fixed radio link, a channel is assigned autonomously and automatically when commissioning the link, depending on interference measurement results and/or distance measurement results. The possibility for automatic channel selection decreases the amount of commissioning work by removing the need for detailed frequency planning and fixed channel setting at the factory for each radio.

Abstract: A RAKE receiver for receiving a spread spectrum signal, the RAKE receiver comprising at least two antennas for receiving a spread spectrum signal containing several user signals, at least one delay unit for delaying the spread spectrum signal received in at least one antenna to prevent the spread spectrum signals received from the different antennas from being cancelled, an adder for combining the spread spectrum signal received in at least two antennas to form a combination signal, and a matched filter for generating a user signal combination impulse response by means of the combination signal.