Nokia Mobile Phones Limited

Alejandro Monge-Navarro

Ari Heikkinen

Pekka Mellanen

A receiving device, the signal received by which has at least one digital data channel, demodulates ( ) and decodes ( ) the digital data included in the data channel and measures ( ) its quality as well on the frequency to be used and at least on one further frequency. The parameter describing the bit error ratio and/or the quantity of correctly received code words will be delivered to a controller ( ) that makes the decision whether the tuning frequency of the radio receiving ( ) part included in the device should be changed.

Method for improving the quality of reception in a radio receiver and a radio receiver

In order to tune a radio receiver (10) to an optimal tuning frequency it is found the critical frequency closest to the current tuning frequency (60) at which the radio receiver loses the locking to the clock frequency of the received signal, and, if necessary (62), the tuning frequency is corrected away from the critical frequency found. The control block (13) of the radio receiver comprises means for adjusting the tuning of the reception part (11) in response to the information (17) indicating whether the locking to the clock frequency is on. The search for the critical frequency may be performed in on or two stages and alternately on both sides of the current tuning frequency or first on one side and then on the other.

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Salo, Finland

Alejandro Monge-Navarro