Bit error rate measuring system
First Claim
1. A system for equivalently measuring bit error rate of received M-phase digital phase-modulated waves by steps comprising multiplying a frequency of an M-phase digital phase-modulated wave by M, wherein M is a positive integer, phase-detecting the M-multiplied signal directly or after frequency conversion by using a reference carrier which is orthogonal to a boundary of an error region in a phasor diagram, detecting errors by comparing the phase detection output with a given threshold which is determined so as to correspond to said boundary of the error region, and counting the number of pulses which represent errors.
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Abstract
A bit error rate of M-phase digital phase-modulated waves is measured by the steps comprising multiplying a received wave by M, phase-detecting the M-multiplied signal either directly or after frequency conversion, detecting errors by comparing the output level of the phase detection with a threshold, and counting the number of such errors. By employing above mentioned system, a bit error rate can be measured easily and accurately by a simple circuit structure.
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Citations
15 Claims
- 1. A system for equivalently measuring bit error rate of received M-phase digital phase-modulated waves by steps comprising multiplying a frequency of an M-phase digital phase-modulated wave by M, wherein M is a positive integer, phase-detecting the M-multiplied signal directly or after frequency conversion by using a reference carrier which is orthogonal to a boundary of an error region in a phasor diagram, detecting errors by comparing the phase detection output with a given threshold which is determined so as to correspond to said boundary of the error region, and counting the number of pulses which represent errors.
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3. A system for equivalently measuring bit error rate in received M-phase digital phase-modulated waves by steps comprising an M-multiply circuit which multiplies a frequency of an M-phase digital phase-modulated wave by M, wherein M is a positive integer.
a phase detection circuit which phase-detects the output from said M-multiply circuit either directly or after frequency conversion by using a reference carrier which is orthogonal to a boundary of an error region in a phasor diagram, a discriminating circuit which compares the output level from said phase-detection circuit with a given threshold which is determined so as to correspond to said boundary of the error region and detects errors, and a counter which counts the output pulses from said discriminating circuit.
Specification