Abstract: A method of mitigating interference between carrier frequency bands of a carrier aggregation scheme. The method comprises: at a wireless device, receiving a first signal on a first carrier frequency band of the carrier aggregation scheme; mixing a second signal onto a second carrier frequency band of the carrier aggregation scheme and transmitting the second signal from the wireless device; executing code on a processing apparatus of the device to generate a reconstructed interference signal, by mixing an instance of the signal with a frequency location of an interfering harmonic from the second carrier frequency band falling in the first carrier frequency band; and removing the reconstructed interference signal from the first signal.

Abstract: A mobile terminal comprising: transceiver apparatus for accessing a wireless network using an earlier and a later generation radio access technology, to establish a voice channel and packet data channel; and an inter radio access technology selector configured to monitor a condition for disabling the earlier generation access, being a condition other than coverage under the earlier generation technology falling below an acceptable lower level. The selector makes inter radio access technology decisions dynamically from the mobile terminal by updating registration with the network to indicate that the earlier generation technology is no longer supported. The selector thereby prevents the mobile terminal being subject to decisions from the network that would otherwise impose transfer to the earlier generation. At least some of the decisions made from the mobile terminal thus disable the earlier generation access whilst in presence of at least the lower level of coverage under the earlier generation.

Abstract: A mobile terminal comprising: transceiver apparatus for accessing a wireless network using an earlier and a later generation radio access technology, to establish a voice channel and packet data channel; and an inter radio access technology selector configured to monitor a condition for disabling the earlier generation access, being a condition other than coverage under the earlier generation technology falling below an acceptable lower level. The selector makes inter radio access technology decisions dynamically from the mobile terminal by updating registration with the network to indicate that the earlier generation technology is no longer supported. The selector thereby prevents the mobile terminal being subject to decisions from the network that would otherwise impose transfer to the earlier generation. At least some of the decisions made from the mobile terminal thus disable the earlier generation access whilst in presence of at least the lower level of coverage under the earlier generation.

Abstract: A method of mitigating interference between carrier frequency bands of a carrier aggregation scheme. The method comprises: at a wireless device, receiving a first signal on a first carrier frequency band of the carrier aggregation scheme; mixing a second signal onto a second carrier frequency band of the carrier aggregation scheme and transmitting the second signal from the wireless device; executing code on a processing apparatus of the device to generate a reconstructed interference signal, by mixing an instance of the signal with a frequency location of an interfering harmonic from the second carrier frequency band falling in the first carrier frequency band; and removing the reconstructed interference signal from the first signal.

Abstract: Polyphase channelizing transmitters convert multiple signal channels into a single stream for transmission and corresponding polyphase channelizing receivers process the received stream to recover signals corresponding to the original signal channels. The filter transfer functions for both the transmitters and receivers are designed to have non-recursive numerators and recursive denominators. Such filters can be realized using non-recursive (e.g., finite impulse response (FIR)) filters and recursive (e.g., infinite impulse response) filters on opposite sides of a Fourier transform. For a given application, polyphase structures of the present invention may require fewer coefficients to implement than conventional (e.g., FIR-based) solutions and will therefore be less complex and less expensive.

Abstract: In a preferred embodiment, an FM demodulator includes an I and Q sampler for generating data samples of I and Q signals of an FM signal. A signal processor derives samples of a modulating waveform of the FM signal from the I and Q data samples, using a Lagrangian interpolation function of the I and Q data samples. Variables include derivatives of the I and Q signals obtained by differentiation of the Lagrangian function. Preferably, the processor further utilizes a correction factor to correct the modulating waveform samples obtained from the Lagrangian-based interpolation, to thereby derive a modulating waveform exhibiting low signal distortion.