Radio communications apparatus with diversity
First Claim
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1. Radio communications apparatus for receiving a plurality of calls comprising:
- a plurality of receivers tunable to a plurality of frequencies,first and second antennas,switching means for switching the plurality of receivers to selected ones of the first and second antennas andcontrol means coupled to the plurality of receivers for tuning the receivers to receive calls, the control means comprising;
means for identifying a received call of low quality received through the first of the antennas and through a first of the plurality of receivers, means for identifying a spare receiver that is not required for receipt of a call, means for causing the switching means to switch the spare receiver to receive the call through the second antenna, means for tuning the spare receiver to the frequency of the call of low quality and means for diversity combining the calls through the first receiver and the spare receiver.
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Abstract
This invention relates to apparatus and a method for provision of diversity in reception in a communications system such as the GSM cellular radio system. A received call of low quality is received through a first of two antennas (15, 16) and through first of a plurality of receivers (10-14). A spare receiver that is not required for receipt of a call is identified and the spare receiver is switched to receive the call through the second antenna. The spare receiver is tuned to the frequency of the call of low quality and the calls are diversity combined through the first receiver and the spare receiver.
69 Citations
10 Claims
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1. Radio communications apparatus for receiving a plurality of calls comprising:
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a plurality of receivers tunable to a plurality of frequencies, first and second antennas, switching means for switching the plurality of receivers to selected ones of the first and second antennas and control means coupled to the plurality of receivers for tuning the receivers to receive calls, the control means comprising; means for identifying a received call of low quality received through the first of the antennas and through a first of the plurality of receivers, means for identifying a spare receiver that is not required for receipt of a call, means for causing the switching means to switch the spare receiver to receive the call through the second antenna, means for tuning the spare receiver to the frequency of the call of low quality and means for diversity combining the calls through the first receiver and the spare receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reception of a call comprising the steps of:
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providing a plurality of receivers tunable to a plurality of frequencies; providing first and second antennas; providing switching means for switching the plurality of receivers to selected ones of the first and second antennas; controlling the plurality of receivers for tuning the receivers to set up channels to receive calls; identifying a received call of low quality received through the first of the antennas and through a first of the plurality of receivers; identifying a spare receiver that is not required for receipt of a call; causing the switching means to switch the spare receiver to receive the call through the second antenna; tuning the spare receiver to the frequency of the call of low quality; diversity combining the calls through the first receiver and the spare receiver.
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Specification