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"Gene Fairbanks (born 8 August 1982 in Goondiwindi, Australia) is a retired professional Australian rugby union footballer. He played for the Reds, Brumbies, and Force in the Super Rugby competition as well as for Kintetsu Liners in Japan. A devastating defender his usual positions were inside centre or fly-half. Career Educated at Downlands College in Toowoomba, Fairbanks played his senior club rugby for Easts Tigers and was invited to join the Reds Rugby College in 1997. He made his Super 12 debut for the Queensland Reds in 2003 in a match against the Chiefs in Hamilton. Later that year he was selected in the Australian Under 21s team. His 2004 season for the Reds was troubled by a foot injury he sustained in the pre-season. Fairbanks signed with the Brumbies for the 2005 season, scoring a try on debut against the Crusaders and he went on to earn eight caps for the season, starting in seven of those matches. He played in eleven of the Brumbies' matches of the 2006 Super 14 season, and was subsequently included in the 2006 Wallabies squad. After the 2009 Super 14 season, Fairbanks signed for the Japanese team Honda Heat for the 2009–10 Top League season, playing seven matches. He secured a two-year deal with the Western Force, and played eight Super Rugby games in 2011, but was hindered by niggling injuries and did not play for the Force in 2012. Fairbanks moved to Japan at the end of 2012, joining the Top League club Kintetsu Liners, where he played for three seasons. Reference list External links * stats on It's Rugby Gene Fairbanks on brumbies.com.au *Gene Fairbanks on sarugby.com *Fairbanks' loyalty to code pays off with tour in The Australian 5 October 2006 1982 births Australian rugby union players Brumbies players Western Force players Queensland Reds players Honda Heat players Kintetsu Liners players Living people Rugby union centres Rugby union fly-halves Australian expatriate rugby union players Expatriate rugby union players in Japan Australian expatriate sportspeople in Japan Sportspeople from Queensland "
"A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrier wave and the receiver's local oscillator for the purpose of coherent demodulation. Example of QPSK carrier recovery phase error causing a fixed rotational offset of the received symbol constellation, X, relative to the intended constellation, O. Example of QPSK carrier recovery frequency error causing rotation of the received symbol constellation, X, relative to the intended constellation, O. In the transmitter of a communications carrier system, a carrier wave is modulated by a baseband signal. At the receiver the baseband information is extracted from the incoming modulated waveform. In an ideal communications system, the carrier signal oscillators of the transmitter and receiver would be perfectly matched in frequency and phase thereby permitting perfect coherent demodulation of the modulated baseband signal. However, transmitters and receivers rarely share the same carrier oscillator. Communications receiver systems are usually independent of transmitting systems and contain their own oscillators with frequency and phase offsets and instabilities. Doppler shift may also contribute to frequency differences in mobile radio frequency communications systems. All these frequency and phase variations must be estimated using information in the received signal to reproduce or recover the carrier signal at the receiver and permit coherent demodulation. Methods For a quiet carrier or a signal containing a dominant carrier spectral line, carrier recovery can be accomplished with a simple band-pass filter at the carrier frequency or with a phase-locked loop, or both.Bregni 2002 However, many modulation schemes make this simple approach impractical because most signal power is devoted to modulation—where the information is present—and not to the carrier frequency. Reducing the carrier power results in greater transmitter efficiency. Different methods must be employed to recover the carrier in these conditions. = Non-data-aided = Non-data-aided/“blind” carrier recovery methods do not rely on any knowledge of the modulation symbols. They are typically used for simple carrier recovery schemes or as the initial method of coarse carrier frequency recovery.Gibson 2002 Closed-loop non-data-aided systems are frequently maximum likelihood frequency error detectors. Multiply-filter-divide In this method of non-data-aided carrier recovery a non-linear operation (frequency multiplier) is applied to the modulated signal to create harmonics of the carrier frequency with the modulation removed (see example below) . The carrier harmonic is then band-pass filtered and frequency divided to recover the carrier frequency. (This may be followed by a PLL.) Multiply-filter-divide is an example of open-loop carrier recovery, which is favored in burst transactions (burst mode clock and data recovery) since the acquisition time is typically shorter than for close-loop synchronizers. If the phase- offset/delay of the multiply-filter-divide system is known, it can be compensated for to recover the correct phase. In practice, applying this phase compensation is difficult.Feigin 2002 In general, the order of the modulation matches the order of the nonlinear operator required to produce a clean carrier harmonic. As an example, consider a BPSK signal. We can recover the RF carrier frequency, \omega_{RF} by squaring: :\begin{align} V_{BPSK}(t) &{}= A(t) \cos(\omega_{RF}t + n\pi); n = 0,1 \\\ V^2_{BPSK}(t) &{}= A^2(t) \cos^2(\omega_{RF}t + n\pi) \\\ V^2_{BPSK}(t) &{}= \frac{A^2(t)}{2}[1 + \cos(2\omega_{RF}t + n2{\pi})] \end{align} This produces a signal at twice the RF carrier frequency with no phase modulation (modulo 2\pi phase is effectively 0 modulation) For a QPSK signal, we can take the fourth power: :\begin{align} V_{QPSK}(t) &{}= A(t) \cos(\omega_{RF}t + n\frac{\pi}{2}); n = 0,1,2,3 \\\ V^4_{QPSK}(t) &{}= A^4(t) \cos^4(\omega_{RF}t + n\frac{\pi}{2}) \\\ V^4_{QPSK}(t) &{}= \frac{A^4(t)}{8}[3 + 4\cos(2\omega_{RF}t + n{\pi}) + \cos(4\omega_{RF}t + n2\pi)] \end{align} Two terms (plus a DC component) are produced. An appropriate filter around 4\omega_{RF} recovers this frequency. Costas loop Carrier frequency and phase recovery as well as demodulation can be accomplished using a Costas loop of the appropriate order.Nicoloso 1997 A Costas loop is a cousin of the PLL that uses coherent quadrature signals to measure phase error. This phase error is used to discipline the loop's oscillator. The quadrature signals, once properly aligned/recovered, also successfully demodulate the signal. Costas loop carrier recovery may be used for any M-ary PSK modulation scheme. One of the Costas Loop's inherent shortcomings is a 360/M degree phase ambiguity present on the demodulated output. = Decision-directed = At the start of the carrier recovery process it is possible to achieve symbol synchronization prior to full carrier recovery because symbol timing can be determined without knowledge of the carrier phase or the carrier's minor frequency variation/offset.Barry 2003 In decision directed carrier recovery the output of a symbol decoder is fed to a comparison circuit and the phase difference/error between the decoded symbol and the received signal is used to discipline the local oscillator. Decision directed methods are suited to synchronizing frequency differences that are less than the symbol rate because comparisons are performed on symbols at, or near, the symbol rate. Other frequency recovery methods may be necessary to achieve initial frequency acquisition. A common form of decision directed carrier recovery begins with quadrature phase correlators producing in-phase and quadrature signals representing a symbol coordinate in the complex plane. This point should correspond to a location in the modulation constellation diagram. The phase error between the received value and nearest/decoded symbol is calculated using arc tangent (or an approximation). However, arc tangent, can only compute a phase correction between 0 and \pi/2. Most QAM constellations also have \pi/2 phase symmetry. Both of these shortcomings came be overcome by the use of differential coding. In low SNR conditions, the symbol decoder will make errors more frequently. Exclusively using the corner symbols in rectangular constellations or giving them more weight versus lower SNR symbols reduces the impact of low SNR decision errors. See also * Clock recovery * Phase detector Notes References * Electronic oscillators Communication circuits Multiplexing "
"Tuta may refer to: ;Locations *Tuta, Boyacá, a municipality in Boyacá Department, Colombia *Tuta, a village in Târgu Trotuș Commune, Bacău County, Romania ;People *Frederick Tuta (1269—1291), Margrave of Landsberg *Mladen Naletilić Tuta (born 1946), Bosnian Croat paramilitary leader *Servando Gómez Martínez (born 1966), Mexican drug lord nicknamed La Tuta *Tuta (footballer) (born 1974), the nickname of Brazilian footballer, Moacir Bastos *Tuta (footballer, born 1999), Brazilian footballer *Adorcelino Wesley Gomes da Silva (born 1984), a Brazilian footballer also nicknamed Tuta ;Other *Tuta (moth), a moth (Lepidoptera, Gelechiidae) genus *TUTA, the Australian Trade Union Training Authority *TUTA Theatre, Chicago-based theatre company *TuTa, a form of boilersuit designed by Thayaht See also *Tutta, a feminine given name "