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RECOMMENDED MINIMUM TELEMETRY FREQUENCY SPACING WITH CPFSK, CPM, SOQPSK, AND FQPSK SIGNALSLaw, Eugene 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / This paper will present equations for calculating the minimum recommended frequency separation of two digital telemetry signals. The signals can be filtered continuous phase frequency shift keying (CPFSK), multi-h continuous phase modulation (CPM) [1], shaped offset quadrature phase shift keying-Telemetry Group (SOQPSK-TG, aka SOQPSK-A*) [2], or Feher’s patented quadrature phase shift keying FQPSK-B (or FQPSK-JR [3]). The equations are based on measured data in an adjacent channel interference (ACI) environment for filtered CPFSK (aka PCM/FM), multi-h CPM (or CPM for short), SOQPSK-TG, FQPSK-JR, and FQPSK-B. This paper is an extension of my 2001 and 2002 International Telemetering Conference papers on this topic [4, 5]. The quantity measured was bit error probability (BEP) versus frequency separation at a given signal energy per bit to noise power spectral density ratio (Eb/No). The interferers were CPFSK, CPM, SOQPSK-TG or FQPSK-B (-JR) signals. The results presented in this paper will be for a desired signal bit rate of 1 to 20 Mb/s, one interferer 20 dB larger than the desired signal (a few tests included two interferers), and various center frequency spacings, interfering signals, receivers, and demodulators. The overall ACI test effort has collected data sets at several bit rates and with one and two interferers. The results will be useful to system designers and range operators as they attempt to maximize the number of Mb/s that can be simultaneously transmitted with minimal interference in the telemetry bands.
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IFM EFFECTS ON PCM/FM TELEMETRY SYSTEMSLaw, Gene, Whiteman, Don 10 1900 (has links)
International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California / Incidental Frequency Modulation (IFM) products in telemetry transmitters can be a
significant cause of bit errors in received Pulse Code Modulation/Frequency Modulation
(PCM/FM) telemetry data. Range Commanders Council (RCC) and other documents give
little or no guidance as to acceptable levels of IFM for telemetry applications. The
expected higher vibration levels of future high velocity missile systems means that IFM
levels are likely to be higher than previously encountered.
This paper presents measured data on Bit Error Rate (BER) versus IFM levels at given
Signal to Noise Ratios (SNR’s) for PCM/FM telemetry systems. The information
presented can be utilized with BER versus SNR plots in the Telemetry Applications
Handbook, RCC Document 119, to determine the additional link margin required to
minimize IFM effects on telemetry data quality.
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ADJACENT CHANNEL INTERFERENCE MEASUREMENTS WITH CPFSK, CPM AND FQPSK-B SIGNALSLaw, Eugene 10 1900 (has links)
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California / This paper will present measured data in an adjacent channel interference (ACI) environment for
filtered continuous phase frequency shift keying (CPFSK or FM), multi-h continuous phase
modulation (multi-h CPM or CPM for short) [1] and Feher’s patented quadrature phase shift keying
(FQPSK-B) [2]. This paper is an extension of my 2001 International Telemetering Conference
paper on this topic [3]. The quantity measured was bit error probability (BEP) versus signal energy
per bit to noise power spectral density ratio (E(b)/N(o)). The interferers were CPFSK, CPM, or
FQPSK-B signals. The results presented in this paper will be for a desired signal bit rate of 5 Mb/s,
one interferer 20 dB larger than desired signal (a few tests included two interferers), and various
center frequency spacings, interfering signals, receivers, and demodulators. The overall ACI test
effort will collect data sets at several bit rates and with one and two interferers. The results will be
useful to system designers and range operators as they attempt to maximize the number of Mb/s that
can be simultaneously transmitted with minimal interference in the telemetry bands.
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CMA BLIND EQUALIZER FOR AERONAUTICAL TELEMETRYXingwen, Ding, Wantao, Zhai, Hongyu, Chang, Ming, Chen 11 1900 (has links)
In aeronautical telemetry, the multipath interference usually causes significant performance
degradation. As the bit rate of telemetry systems increases, the impairments of multipath
interference are more serious. The constant modulus algorithm (CMA) blind equalizer is effective
to mitigate the impairments of multipath interference. The CMA adapts the equalizer coefficients
to minimize the deviation of the signal envelope from a constant level. This paper presents the
performances of the CMA blind equalizer applied for PCM-FM, PCM-BPSK, SOQPSK-TG and
ARTM CPM in aeronautical telemetry.
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PERFORMANCE TRADE-OFFS WHEN IMPLEMENTING TURBO PRODUCT CODE FORWARD ERROR CORRECTION FOR AIRBORNE TELEMETRYTemple, Kip 10 1900 (has links)
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Hardware implementing forward error correction (FEC) is currently available for utilization by the
airborne telemetry system designer. This paper will discuss the potential benefits along with drawbacks
when using this technology. Laboratory testing is supplemented with real-world flight testing.
Performance results comparing FEC and non-FEC systems are presented for both IRIG-106 Pulse Code
Modulation/Frequency Modulation, PCM/FM, (or Continuous Phase Frequency Shift Keying, CPFSK,
with filtering, or ARTM Tier 0) and Shaped Offset Quadrature Phase Shift Keying, Telemetry Group
version (SOQPSK-TG or ARTM Tier I) waveforms.
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AN INITIAL LOOK AT ADJACENT BAND INTERFERENCE BETWEEN AERONAUTICAL MOBILE TELEMETRY AND LONG-TERM EVOLUTION WIRELESS SERVICETemple, Kip 11 1900 (has links)
With National Telecommunications & Information Administration (NTIA) Advanced Wireless
Services (AWS-3) auction of frequencies in the 1695-1710 MHz, 1755-1780MHz, and 2155-
2180MHz bands, users of the Aeronautical Mobile Telemetry (AMT) band from 1755-
1850MHz, known as Upper L-Band, could be greatly affected. This paper takes an initial look at
how the 1755-1780MHz band will be used by the cellular carriers and presents some preliminary
testing results of adjacent channel (band) interference that could be experienced by AMT users.
This paper should be considered as the stepping off point for future interference discussions,
required analysis, and further testing.
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