frequency division multiplexing

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data transmission by frequency-division multiplexing using the discrete fourier transform

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1 headnote for frequency division multiplexing

- Frequency division multiplexing

559 documents for frequency division multiplexing

- High speed in both directions over POTS.
Paradyne's Multiple Virtual Lines technology - Company Business and Marketing Paradyne's Multiple Virtual Lines (MVL) technology offers two-way transfer rates at 768 Kbps, and promises to offer to carriers a cost-effective way of transporting data, voice and video. The technology, which starts shipping in Mar 1998, uses a new MVL 4-Port card and a modem-like 'end-point box' at the user's end that has a 10Base-T interface and a POTS connector. Unlike DSL technology, which uses a frequency division multiplexing scheme, MVL technology uses a time-space switching scheme. The MVL technology permits services over 18,000-foot loops and can be enhanced to reach loops of over 26,000 feet. MVL can be implemented over much lower range of frequencies than xDSL technologies. Paradyne estimates the ...
- Communications News
- Vol. 35 Nbr. 2, February 1998
- Digital Voice and Multiplexing.
The integration of voice into data communications networks is based on the use of digital signals and frequency-division multiplexing. The conversion of the analog voice-channel input to digital is carried out by the codec. Codecs, which are now on a single integrated circuit chip, convert the 4-kHz input bandwidth to a 64-kb-s data stream by sampling the voltage on the analog side and then putting out a digital word of the appropriate length. The world standard for digitized voice, 64-kb-s, is known as PCM, for pulse-code modulation. Multiplexing twenty-four channels of 64-kb-s gives 1,536,000 b-s. To this the phone company added an allowance of 8,000 b-s for control and synchronization, for a total of 1.544 million b-s, which is T-1 in the United States. Diagrams illustrating basic di...
- Communications News
- Vol. 21 Nbr. 3, March 1984
- 47 CFR 101.105 - Interference protection criteria.
...) To long-haul analog systems, employing frequency modulated radio and frequency division multiplexin... radio and frequency division multiplexing to provide multiple voice channels, the allowable ...
- Code of Federal Regulations - Title 47: Telecommunication

- Antitrust review of the AT&T/T-mobile transaction.
... with the technology based on orthogonal frequency-division multiplexing ("OFDM"). (69) To the extent...
- Federal Communications Law Journal
- Vol. 64 Nbr. 1, December 2011
- 47 CFR 73.758 - System specifications for digitally modulated emissions in the HF broadcasting service.
... with analog emissions in the same high frequency broadcasting (HFBC) band, provided the protection ... (QAM) with orthogonal frequency division multiplexing (OFDM) shall be used. 64-QAM is feasi...
- Code of Federal Regulations - Title 47: Telecommunication
- Tera Santa Consortium Targets World's First Terabit Optical Network.
... the world's first Terabit Orthogonal Frequency Division Multiplexing (OFDM)-based optical network...
- Business Wire
- April 11, 2011
- 14 CFR 171.311 - Signal format requirements.
... sequentially on the same C-band frequency. Each function is identified by a unique digital c... assignment or channel, using time division multiplexing. These components must be capable of ...
- Code of Federal Regulations - Title 14: Aeronautics and Space
- Research and Markets: Millimeter Wave Communication Systems.
...2.2 Phase shift keying (PSK). 2.3 Frequency shift keying (FSK). 2.4 Quadrature amplitude modullation (QAM). 2.5 Orthogonal frequency division multiplexing (OFDM). CHAPTER 3 MILLIMETER WAVE TRA...
- Business Wire
- March 08, 2011
- Research and Markets: The 100 Gbps Optical Food Chain - 100G DWDM Line Cards Are Expected To Grow Into a $2.3 Billion Dollar Market By 2015.
...* Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) Could be Key to Ge...
- Business Wire
- June 13, 2011
- Bell Labs Research Adapts to 21st Century
Just a few decades ago, AT&T's Bell Labs occupied the summit of industrial research. On a sprawling New Jersey site that resembled an academic campus more than a commercial laboratory, the organization's staffers not only produced breakthrough technologies for telecommunications but such key advances in fundamental physics as demonstration of the wave nature of matter and discovery of the cosmic microwave background radiation. Bell Labs continues to focus its research on innovation that will define communications in the 21st century. What enables them to achieve this level of sustained impact over such a period of time is their commitment to excellence in research that can be leveraged into disruptive advances in communications and information networks. To achieve such excellence, t...

... network architectures, Dense Wave Division Multiplexing and associated wavelength-routed netw... and its router counterpart, Orthogonal Frequency Division Multiplexing, 100 gigabit Ethernet, base ...
- Research Technology Management
- Vol. 52 Nbr. 4, July 2009