Adjustment of local oscillator frequency for receiving carrier-aggregated signals
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A receiver for receiving data transmitted via a combination of a first signal modulated at a first carrier frequency, and a second signal modulated at a second, different carrier frequency, is disclosed. The receiver comprises a local oscillator and is arranged to adaptively configure the local oscillator to operate at a first local oscillator frequency and a second, different local oscillator frequency, in dependence upon the similarity of signal strengths of the first and second signals. The receiver includes means for identifying relative signals strengths by performing a comparison operation which compares the difference in the received signal strength (RSS) between the first and second signals with a predetermined threshold. If the comparison determines that signal strengths are similar, the first local oscillator frequency is used. Otherwise, the second local oscillator frequency is used. This arrangement enables a circuit employing only a single local oscillator to be used, thereby improving receiver stability and reducing material and power consumption costs. Also disclosed is a method for configuring a receiver to receive signals transmitted by carrier aggregation using a single, adaptable local oscillator wherein the local oscillator is adjusted to operate at a frequency determined by relative signal strengths.