International Telemetering Conferencehttp://hdl.handle.net/10150/5758672024-03-29T01:06:47Z2024-03-29T01:06:47ZInternational Telemetering Conference Proceedings, Volume 58 (2023)http://hdl.handle.net/10150/6706392024-01-09T01:13:44Z2023-10-01T00:00:00ZInternational Telemetering Conference Proceedings, Volume 58 (2023)
2023-10-01T00:00:00ZOn the Use of Bit Error Rate Testers to Test the Data Quality MetricRice, MichaelSheets, GaryGross, ToddGembarowski, ChrisWeis, Ashleyhttp://hdl.handle.net/10150/6705262023-12-23T01:29:11Z2023-10-01T00:00:00ZOn the Use of Bit Error Rate Testers to Test the Data Quality Metric
Rice, Michael; Sheets, Gary; Gross, Todd; Gembarowski, Chris; Weis, Ashley
Many modern telemetry receivers have the capability to estimate the bit error probability (BEP) and to transfer this information, in the form of the data quality metric (DQM) to a telemetry data center. When the DQMs from multiple receivers are transferred with their corresponding bit decisions to a central location, the DQMs enable an advanced form of best source selection that has been shown to improve the overall reliability of the telemetry data. For this to work, the BEP estimation algorithm must be properly calibrated across all receivers, regardless of manufacturer. To test the calibration, a receiver’s bit error rate (BER) obtained from a bit error rate tester (BERT) may be compared to the BEP estimate derived from the DQM. Because both the BEP and the BER are estimates, both exhibit random variations that make comparing the two difficult. This paper describes the use of BER confidence intervals to compare the BEP and BER estimates.
2023-10-01T00:00:00ZLDPC Codes for IRIG-106 Waveforms: Part II – Receiver DesignPerrins, Erikhttp://hdl.handle.net/10150/6705252023-12-23T01:29:05Z2023-10-01T00:00:00ZLDPC Codes for IRIG-106 Waveforms: Part II – Receiver Design
Perrins, Erik
Low density parity check (LDPC) codes allow a communications link to operate reliably at signal to noise ratios that are very close to the Shannon limit. Because of this, in the early 2000s they were studied in connection with SOQPSK-TG and were eventually adopted into the IRIG-106. The deployment for SOQPSK-TG has proved to be very successful, which has motivated interest in finding an LDPC solution for PCM/FM and ARTM CPM. Such a solution, however, has proved to be elusive for reasons that were not entirely clear in the past. In our companion paper, we reveal these reasons, which also allows us to develop an LDPC design procedure for all IRIG-106 modulations and we apply this procedure to PCM/FM and ARTM CPM. In this paper, our focus is on developing high-speed, parallelizable decoders/demodulators that are suitable for highthroughput applications. We present the performance characteristics of our fixed-point software prototype system. We demonstrate that the coded LDPC system performs around one dB from the respective channel capacities of these modulations. As such, these codes can be considered to fill in the LDPC options that are currently absent in the IRIG-106 standard for PCM/FM and ARTM CPM.
2023-10-01T00:00:00ZLDPC Codes for IRIG-106 Waveforms: Part I – Code DesignPerrins, Erikhttp://hdl.handle.net/10150/6705242023-12-23T01:28:58Z2023-10-01T00:00:00ZLDPC Codes for IRIG-106 Waveforms: Part I – Code Design
Perrins, Erik
Low density parity check (LDPC) codes allow a communications link to operate reliably at signal to noise ratios that are very close to the Shannon limit. Because of this, in the early 2000s they were studied in connection with SOQPSK-TG and were eventually adopted into the IRIG-106. The deployment for SOQPSK-TG has proved to be very successful, which has motivated interest in finding an LDPC solution for PCM/FM and ARTM CPM. Such a solution, however, has proved to be elusive for reasons that were not entirely clear in the past. In this paper, we lay out the fundamental considerations that must be made in order to design LDPC codes for a specific modulation format. In doing so, we show that SOQPSK-TG enjoys specific similarities with BPSK that allowed an “easy path” toward an LDPC solution in IRIG-106. Most importantly, we show that when the design process begins at the proper starting point, it is just as easy to design LDPC codes that are customized to a particular modulation. We then apply this straightforward design process to PCM/FM and ARTM CPM and demonstrate that the resulting LDPC codes perform around one dB from the respective channel capacities of these modulations. In our companion paper, we develop parallel decoder architectures for these schemes that can achieve high throughput. As such, these codes can be considered to fill in the options for LDPC codes that are currently absent in the IRIG-106 standard.
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