Journal Article10.1109/TCOM.1977.1093808
Microprocessor Implementation of High-Speed Data Modems
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TL;DR: This paper describes the application of a commercially available microprocessor to a flexible data transmitter and data receiver for high-speed data modems.
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Abstract: This paper describes the application of a commercially available microprocessor (Intel 3000 or Signetics 3000) to a flexible data transmitter and data receiver for high-speed data modems. For the transmitter a quadrature modulation scheme is chosen; the receiver is based on phase-shift compensation techniques and coherent demodulation with an externally derived digital carrier. For the realization with the given microprocessor it has been necessary to adapt the way of executing the various operations (especially the multiplications for the digital filtering) to the available computational capabilities. The resulting microprocessor implementations are also suitable for application in the current medium-speed synchronous data transmission systems.
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Citations
High-Accuracy Analog Measurements via Interpolated FFT
TL;DR: In this article, interpolated fast Fourier transform (FFT) algorithms are used for multi-parameter measurements upon periodic signals, such as fundamental frequency, phase, and amplitude, with enhanced accuracy compared to existing algorithms.
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A class of FIR Nyquist (Nth-band) filters with zero intersymbol interference
Tapio Saramaki,Y. Neuvo +1 more
TL;DR: In this paper, a new class of linear-phase FIR Nyquist (N th-band) filters composed of cascaded FIR subfilters with different periodicities in the frequency domain is introduced.
90
Patent
Data transmission systems
William Hodgkiss
- 13 Mar 1987
TL;DR: In this paper, a modem for a digital data transmission system in which binary-coded data at up to 9.6 Kbit/sec is transmitted over a telephone line pair circuit, as phase and amplitude modulation (QAM) of a carrier signal at a frequency of 1800 Hz, at a line symbol rate of 2400 bauds.
87
Patent
Adaptive rate control for echo cancelling modem
Manickam R. Sridhar,John Payton,Carol Bargoot +2 more
- 04 Dec 1989
TL;DR: In this paper, an echo cancellation modem for full-duplex communication was proposed, which selects a modulation scheme prior to data communication, and requests changes to the level of modulation during data communication when channel quality has changed significantly.
67
The TMS320 family of digital signal processors
Kun-Shan Lin,G.A. Frantz,R. Simar +2 more
- 01 Sep 1987
TL;DR: The three generations of the TMS320 family of digital signal processors available from Texas Instruments are described and the evolution in architectural design of these processors and key features of each generation are discussed.
55
References
On the selection of a two-dimensional signal constellation in the presence of phase jitter and Gaussian noise
TL;DR: The results indicate that in Gaussian noise alone an improvement in signal-to-noise ratio of as much as 2 dB may be realized by using quadrature amplitude modulation instead of conventional amplitude and phase modulation.
121
The Performance of Staggered Quadrature Amplitude Modulation in the Presence of Phase Jitter
Richard D. Gitlin,E. Ho +1 more
TL;DR: It is demonstrated that offsetting, or staggering, the in-phase and quadrature data streams by a fraction of a symbol interval improves the phase-jitter immunity of a conventional QAM data transmission system.
48
Digital Generation of Linearly Modulated Data Waveforms
TL;DR: It is shown that for any rational relation of line carrier frequency and digit frequency, digital data transmitters can be designed economically and adapted to large scale integration (LSI) techniques.
12
A New Digital Coherent Demodulator
TL;DR: A coherent demodulator is described which is particularly well suited to digital implementation and will be useful in those systems that do not require passband digital signal processing for other purposes.
11
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