Mobile switching between STTD and non-diversity mode
AssigneeTexas Instruments Incorporated
InventorAnand G. Dabak
Life of this patent
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Abstract
A communication circuit is designed with a detector circuit (720) coupled to receive a first signal. The detector circuit is arranged to produce a multipath signal corresponding to a number of paths of the first signal. A comparator circuit (726) is coupled to receive the multipath signal and a threshold signal. The comparator circuit is arranged to produce a diversity signal in response to a comparison of the multipath signal and the threshold signal. The diversity signal has a first logic state for enabling diversity and has a second logic state for disabling diversity.
Claims18
A communication circuit, comprising:
- a detector circuit coupled to receive a first signal, the detector circuit arranged to produce a multipath signal corresponding to a number of paths of the first signal;
- and
- a comparator circuit coupled to receive the multipath signal and a threshold signal, the comparator circuit arranged to produce a diversity signal in response to a comparison of the multipath signal and the threshold signal, the diversity signal having a first logic state for enabling diversity and having a second logic state for disabling diversity.
A communication circuit coupled to receive a diversity signal, the communication circuit comprising:
- an encoder circuit coupled to receive a first signal, the encoder circuit arranged to produce a second signal comprising at least one of a complement and a conjugate of the first signal;
- and
- an output circuit arranged to produce the first signal and the second signal in response to a first logic state of the diversity signal, the output circuit arranged to produce the first signal and not produce the second signal in response to a second logic state of the diversity signal.
A method of switching between diversity and non-diversity modes in a communication circuit, comprising the steps of:
- receiving a first signal from a source external to the communication circuit;
- producing a multipath signal corresponding to a number of paths of the first signal from a plurality of transmit antennas at the source external;
- comparing the multipath signal to a threshold signal;
- producing a diversity signal having a first value when the multipath signal is greater than the threshold signal;
- and
- producing a diversity signal having a second value different from the first value when the multipath signal is less than the threshold signal.
A method of switching between diversity and non-diversity modes in a communication circuit, comprising the steps of:
- receiving a first signal from a source external to the communication circuit;
- producing a multipath signal corresponding to a number of paths of the first signal from the source external;
- comparing the multipath signal to a threshold signal;
- producing a diversity signal having a first value when the multipath signal is greater than the threshold signal and transmitting the diversity signal to the source external;
- and
- producing a diversity signal having a second value different from the first value when the multipath signal is less than the threshold signal and transmitting the diversity signal to the source external.
Dependencies are inferred from the claim text.