System, device, and method for evaluating dynamic range in a communication system
AssigneeMotorola, Inc.
InventorsJohn L. Moran, III, Bruce O. Cox, William Leslie Brown
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Abstract
A system, device, and method for evaluating dynamic range in a communication system utilizes a narrow band multiple tone test signal for emulating a wide band composite signal equivalent to the symbol rate bandwidth of a digitally modulated carrier. The multiple tone test signal is constructed such that a significant portion of the third order intermodulation distortion products fall within the channels adjacent to the test channel so that the dynamic range can be evaluated with a commercially available industry standard CATV analyzer using a standard adjacent channel power measurement technique.
Claims8
A system for evaluating dynamic range in a communication network, the communication network supporting at least a test channel having a predetermined center frequency, a first channel adjacent to the test channel, and a second channel adjacent to the test channel, the system comprising:
- a signal generating device for transmitting a test signal on the test channel at a predetermined signal power level;
- a signal analyzing device for measuring distortion of the test signal, the signal analyzing device comprising:
- means for measuring power in the test channel to obtain a test channel power level;
- means for measuring power in the first adjacent channel to obtain a first adjacent power level;
- means for measuring power in the second adjacent channel to obtain a second adjacent power level;
- and
- means for summing the first adjacent channel power level and the second adjacent power level to obtain a total distortion power level;
- and
- means for determining, based on said distortion measurement, whether the signal power level is within a range of valid signal power levels;
- the means for determining comprising:
- means for quantizing the distortion of the test signal as a ratio of the test channel power level relative to the total distortion power level;
- means for comparing the quantized value to a set of predetermined quantized values;
- and
- means for determining whether the quantized value is the minimum among the set of quantized values.
Dependencies are inferred from the claim text.