Dynamic multi-path detection device and method
In one embodiment of the present invention, a dynamic multi-path detection device is disclosed to include at least one narrow-band signal metric estimator responsive to input signal. Each of the at least one estimators measures a particular characteristic of the input signal in a frequency band that is narrower than the overall signal bandwidth and is operative to generate a signal parameter estimate signal. The dynamic multi-path detection device is further disclosed to include a signal metric comparison device responsive to the signal parameter estimate signal(s) and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path.
1. A dynamic multi-path detection device comprising:
at least one narrow-band signal metric estimator responsive to an input signal with an input signal bandwidth, each of the at least one estimators measuring a particular characteristic of the input signal within a bandwidth less than the input signal bandwidth and operative to generate a parameter estimate signal; and
a signal metric comparison device responsive to the parameter estimate signal(s) and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path, wherein the signal metric comparison device includes,
a summing device for summing the parameter estimate signals and operative to generate a metric difference signal;
an absolute value device responsive to said metric difference signal and operative to generate an absolute metric difference signal;
a first threshold comparison device and a second threshold comparison device, both coupled to receive the absolute metric difference signal, the first threshold comparison device operative to generate first threshold comparison signal and the second threshold comparison device operative to generate a second threshold comparison signal, and the signal metric comparison device further includes a counter responsive to the second threshold comparison signal and operative to generate a threshold comparison time signal; and
a third threshold comparison device coupled to receive the threshold comparison time signal and operative to generate a third threshold comparison signal.
2. A dynamic multi-path detection device, as recited in claim 1 , wherein said dynamic multi-path indication signal is used to adapt multi-path tracking speed in accordance with multi-path changes thereby causing mitigation of dynamic multi-path and increasing system performance.
3. A dynamic multi-path detection device, as recited in claim 1 , wherein the signal metric comparison device further includes a logic device responsive to the second threshold comparison signal and the third threshold comparison signal and operative to generate the dynamic multi-path indication signal.
4. A dynamic multi-path detection device, as recited in claim 1 , wherein the dynamic multi-path detection device is responsive to changes in said signal metric estimates over time.
5. A dynamic multi-path detection device, as recited in claim 1 , wherein the input signal is the output of a carrier recovery circuit.
6. A dynamic multi-path detection device comprising:
estimator means for measuring a particular characteristic of a received input signal with an input signal bandwidth at a bandwidth less than the input signal bandwidth and operative to generate a parameter estimate signal; and
a signal metric comparison device responsive to the signal parameter estimate signal and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path wherein the signal metric comparison device includes,
a summing device for summing the parameter estimate signals and operative to generate a metric difference signal;
an absolute value device responsive to said metric difference signal and operative to generate an absolute metric difference signal;
a first threshold comparison device and a second threshold comparison device, both coupled to receive the absolute metric difference signal, the first threshold comparison device operative to generate a first threshold comparison signal and the second threshold comparison device operative to generate a second threshold comparison signal, and the signal metric comparison device further includes a counter responsive to the first threshold comparison signal and operative to generate a threshold comparison time signal, a third threshold comparison device coupled to receive the threshold comparison time signal and operative to generate a third threshold comparison signal.
7. A dynamic multi-path detection device, as recited in claim 6 , wherein said dynamic multi-path indication signal is used to adapt multi-path tracking speed in accordance with multi-path changes thereby causing mitigation of dynamic multi-path and increasing system performance.
8. A dynamic multi-path detection device, as recited in claim 6 wherein the signal metric comparison device further includes a logic device responsive to the second threshold comparison signal and the third threshold comparison signal and operative to generate the dynamic multi-path indication signal.
9. A dynamic multi-path detection device, as recited in claim 6 wherein the dynamic multi-path detection device is responsive to changes in said signal metric estimates over time.
10. A dynamic multi-path detection device, as recited in claim 6 wherein the input signal is the output of a carrier recovery circuit.
11. A dynamic multi-path detection device comprising:
at least one narrow-band signal metric estimator responsive to an input signal with an input signal bandwidth, each of the at least one estimators measuring a particular characteristic of the input signal within a bandwidth less than the input signal bandwidth and operative to generate a parameter estimate signal; and
a signal metric comparison device responsive to the parameter estimate signal(s) and operative to generate a dynamic multi-path indication signal for detecting dynamic multi-path, wherein the signal metric comparison device includes:
a first threshold comparison device and a second threshold comparison device, both threshold comparison devices coupled to receive an absolute metric difference signal and configured to generate a first and second threshold signal, and wherein the signal metric comparison device further includes a counter responsive to the at least one of the threshold comparison signals and operative to generate a threshold comparison time signal; and
a third threshold comparison device coupled to receive the threshold comparison time signal and operative to generate a third threshold comparison signal.