Citation
Abstract
The LM37 multimegabit telemetry modulator-demodulator unit was tested for evaluation of its symbol error rate (SER) performance. Using an automated test setup, the SER tests were carried out at various symbol rates and signal-to-noise ratios (SNR), ranging from +10 to -10 dB. With the aid of a specially designed error detector and a stabilized signal and noise summation unit, measurement of the SER at low SNR was possible. The results of the tests have shown that at symbol rates below 20 megasymbols per second (MS/s) and input SNR above -6 dB, the SER performance of the modem is within the specified 0.65 to 1,5 dB of the theoretical error curve. At symbol rates above 20 MS/s, the specification is met at SNR’s down to -2 dB. This report presents the results of the SER tests with the description of the test setup and the measurement procedure.
Details
- Volume
- 42-65
- Published
- October 15, 1981
- Pages
- 59–74
- File Size
- 830.0 KB