Abstract: A technique for allowing a linear feedback shift register (LFSR), and particularly a Galois LFSR, to be advanced forward by an amount m (i.e. as if the register had undertaken m input/output cycles), without actually having to undertake m input/output cycles is described. This is useful for example in the communications domain by allowing the shift register to be able to jump to a particular scrambling code. In particular, an embodiment provides an apparatus which is able to control the advance of a LFSR by feeding into the LFSR a data word obtained from the polynomial multiplication of two predetermined data words which are looked up from one or more tables in dependence on an advance amount, being the number of steps the LFSR is to advance. The state of the LFSR after the data word has been fed into the LFSR is then the same state the LFSR would be in if it had actually been advanced by the advance amount.

Abstract: A wireless communications device comprising duplexing means for directing signals from a transmit path towards an antenna and for providing signals from the antenna to a receive path, wherein the transmit path is arranged to send a first signal to the duplexing means, the receive path is arranged to recover a second signal and the device further comprises detecting means for detecting the presence in the receive path of a third signal that will interact with the first signal to produce intermodulation distortion tending to hamper recovery of the second signal and control means responsive to the detecting means for enhancing linearity in the receive path to reduce said intermodulation distortion.

Abstract: A wireless communications device comprising duplexing means for directing signals from a transmit path towards an antenna and for providing signals from the antenna to a receive path, wherein the transmit path is arranged to send a first signal to the duplexing means, the receive path is arranged to recover a second signal and the device further comprises detecting means for detecting the presence in the receive path of a third signal that will interact with the first signal to produce intermodulation distortion tending to hamper recovery of the second signal and control means responsive to the detecting means for enhancing linearity in the receive path to reduce said intermodulation distortion.

Abstract: A method of reducing the power consumption of a multi-mode mobile telecommunications device, the method comprising receiving information relating to the location of the mobile telecommunications device and adjusting the frequency with which the mobile telecommunications device searches for a wireless access point according to the information so received.

Abstract: Datawords encoded using a first-order Reed-Muller code are decoded using a Fast Hadamard Transform (FHT). Where the dataword is known to comprise a number of unused bits at one end, the soft decisions of the codeword are reordered. Majority polling is then performed on groups of the soft decisions to produce a series of soft decisions which make up a new codeword. The new codeword is then decoded using an FHT of lower order than the FHT applicable to the originally received codeword.