Method and apparatus for controlling frequency deviation of a portable transceiver

A system for controlling a plurality of frequency deviation levels of a portable transceiver that utilizes a time-division-duplex (TDD) protocol for communicating, the system comprising:

• controller and base transceiver means for transmitting a first modulated signal having a first plurality of frequency deviation levels during a base-to-portable time slot of the TDD protocol;
• and
• the portable transceiver, comprising:
• processor means for controlling the portable transceiver;
• receiver means coupled to the processor means for receiving the first modulated signal to produce a first received signal;
• measurement means coupled to the processor means for measuring the first received signal to derive estimates of the first plurality of frequency deviation levels, in response to the first received signal passing a predetermined quality test;
• memory means coupled to the processor means for storing the estimates of the first plurality of frequency deviation levels;
• transmitter means coupled to the processor means for generating a second modulated signal having a second plurality of frequency deviation levels controlled by a plurality of control signal values during a portable-to-base time slot of the TDD protocol;
• sampler means coupled to the processor means for sampling the second modulated signal to derive a second received signal;
• appraiser means coupled to the processor means for appraising the second received signal to derive estimates of the second plurality of frequency deviation levels;
• comparator means coupled to the processor means for comparing corresponding estimates of the first and second pluralities of frequency deviation levels to derive a plurality of adjusted control signal values for controlling the second plurality of frequency deviation levels to approximate the first plurality of frequency deviation levels;
• and
• deviation control means coupled to the processor means for controlling the second plurality of frequency deviation levels in accordance with the plurality of adjusted control signal values.

A portable transceiver for controlling a plurality of frequency deviation levels generated by the portable transceiver for use in a system that utilizes a time-division-duplex (TDD) protocol for communicating, the system having a controller and a base transceiver for transmitting a first modulated signal having a first plurality of frequency deviation levels during a base-to-portable time slot of the TDD protocol, the portable transceiver comprising:

• a processor for controlling the portable transceiver;
• a receiver coupled to the processor for receiving the first modulated signal to produce a first received signal;
• a measurement element coupled to the processor for measuring the first received signal to derive estimates of the first plurality of frequency deviation levels, in response to the first received signal passing a predetermined quality test;
• a memory coupled to the processor for storing the estimates of the first plurality of frequency deviation levels;
• a transmitter coupled to the processor for generating a second modulated signal having a second plurality of frequency deviation levels controlled by a plurality of control signal values during a portable-to-base time slot of the TDD protocol;
• a sampler element coupled to the processor for sampling the second modulated signal to derive a second received signal;
• an appraiser element coupled to the processor for appraising the second received signal to derive estimates of the second plurality of frequency deviation levels;
• a comparator element coupled to the processor for comparing corresponding estimates of the first and second pluralities of frequency deviation levels to derive a plurality of adjusted control signal values for controlling the second plurality of frequency deviation levels to approximate the first plurality of frequency deviation levels;
• and
• a deviation control element coupled to the processor for controlling the second plurality of frequency deviation levels in accordance with the plurality of adjusted control signal values.