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- Orthogonal_frequency-division_multiplexing abstract "Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, whether wireless or over copper wires, used in applications such as digital television and audio broadcasting, DSL Internet access, wireless networks, powerline networks, and 4G mobile communications.OFDM is essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), and is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. The word "coded" comes from the use of forward error correction (FEC). A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels. Each sub-carrier is modulated with a conventional modulation scheme (such as quadrature amplitude modulation or phase-shift keying) at a low symbol rate, maintaining total data rates similar to conventional single-carrier modulation schemes in the same bandwidth.The primary advantage of OFDM over single-carrier schemes is its ability to cope with severe channel conditions (for example, attenuation of high frequencies in a long copper wire, narrowband interference and frequency-selective fading due to multipath) without complex equalization filters. Channel equalization is simplified because OFDM may be viewed as using many slowly modulated narrowband signals rather than one rapidly modulated wideband signal. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate intersymbol interference (ISI) and utilize echoes and time-spreading (on analogue TV these are visible as ghosting and blurring, respectively) to achieve a diversity gain, i.e. a signal-to-noise ratio improvement. This mechanism also facilitates the design of single frequency networks (SFNs), where several adjacent transmitters send the same signal simultaneously at the same frequency, as the signals from multiple distant transmitters may be combined constructively, rather than interfering as would typically occur in a traditional single-carrier system.".
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink 01_OFDM_Tutorial_Nisar.pdf.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink OFDM_links.html.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink 5345.html.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink paper_15.shtml.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink www.digitaltvbooks.com.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink cofdm.pdf.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink ofdmstepbystep.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink introduction_orthogonal_frequency_division_multiplex.pdf.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink node6.html.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink patent_navigator.pl?patent=5282222.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink ofdmtutorial.pdf.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink www.wimaxforum.org.
- Orthogonal_frequency-division_multiplexing wikiPageExternalLink www.wimedia.com.
- Orthogonal_frequency-division_multiplexing wikiPageID "22691".
- Orthogonal_frequency-division_multiplexing wikiPageRevisionID "605178637".
- Orthogonal_frequency-division_multiplexing date "April 2014".
- Orthogonal_frequency-division_multiplexing date "September 2012".
- Orthogonal_frequency-division_multiplexing hasPhotoCollection Orthogonal_frequency-division_multiplexing.
- Orthogonal_frequency-division_multiplexing reason "Normally complexity is said to be proportional to N*log2 per block for FFT; i.e., 8192*13 when N=8192.".
- Orthogonal_frequency-division_multiplexing reason "Sounds like a circular definition.".
- Orthogonal_frequency-division_multiplexing subject Category:Multiplexing.
- Orthogonal_frequency-division_multiplexing subject Category:Quantized_radio_modulation_modes.
- Orthogonal_frequency-division_multiplexing subject Category:Software-defined_radio.
- Orthogonal_frequency-division_multiplexing subject Category:Modulation_and_demodulation_scheme.
- Orthogonal_frequency-division_multiplexing type Abstraction100002137.
- Orthogonal_frequency-division_multiplexing type Attribute100024264.
- Orthogonal_frequency-division_multiplexing type Manner104928903.
- Orthogonal_frequency-division_multiplexing type Property104916342.
- Orthogonal_frequency-division_multiplexing type QuantizedRadioModulationModes.
- Orthogonal_frequency-division_multiplexing comment "Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies.".
- Orthogonal_frequency-division_multiplexing label "Acceso múltiple por división de frecuencias ortogonales".
- Orthogonal_frequency-division_multiplexing label "OFDM".
- Orthogonal_frequency-division_multiplexing label "OFDM".
- Orthogonal_frequency-division_multiplexing label "OFDM".
- Orthogonal_frequency-division_multiplexing label "OFDM".
- Orthogonal_frequency-division_multiplexing label "Orthogonal frequency division multiplexing".
- Orthogonal_frequency-division_multiplexing label "Orthogonal frequency-division multiplexing".
- Orthogonal_frequency-division_multiplexing label "Orthogonal frequency-division multiplexing".
- Orthogonal_frequency-division_multiplexing label "Orthogonales Frequenzmultiplexverfahren".
- Orthogonal_frequency-division_multiplexing label "正交頻分复用".
- Orthogonal_frequency-division_multiplexing label "直交周波数分割多重方式".
- Orthogonal_frequency-division_multiplexing sameAs OFDM.
- Orthogonal_frequency-division_multiplexing sameAs Orthogonales_Frequenzmultiplexverfahren.
- Orthogonal_frequency-division_multiplexing sameAs Acceso_múltiple_por_división_de_frecuencias_ortogonales.
- Orthogonal_frequency-division_multiplexing sameAs Orthogonal_frequency-division_multiplexing.
- Orthogonal_frequency-division_multiplexing sameAs OFDM.
- Orthogonal_frequency-division_multiplexing sameAs OFDM.
- Orthogonal_frequency-division_multiplexing sameAs 直交周波数分割多重方式.
- Orthogonal_frequency-division_multiplexing sameAs 직교_주파수_분할_다중_방식.
- Orthogonal_frequency-division_multiplexing sameAs Orthogonal_frequency_division_multiplexing.
- Orthogonal_frequency-division_multiplexing sameAs OFDM.
- Orthogonal_frequency-division_multiplexing sameAs OFDM.
- Orthogonal_frequency-division_multiplexing sameAs m.05p8d.
- Orthogonal_frequency-division_multiplexing sameAs Q375889.
- Orthogonal_frequency-division_multiplexing sameAs Q375889.
- Orthogonal_frequency-division_multiplexing sameAs Orthogonal_frequency-division_multiplexing.
- Orthogonal_frequency-division_multiplexing wasDerivedFrom Orthogonal_frequency-division_multiplexing?oldid=605178637.
- Orthogonal_frequency-division_multiplexing isPrimaryTopicOf Orthogonal_frequency-division_multiplexing.