quadrature amplitude modulation वाक्य
उदाहरण वाक्य
मोबाइल
- The transmission processing of SC-FDMA is very similar to that of OFDMA . For each user, the sequence of bits transmitted is mapped to a complex constellation of symbols ( BPSK, QPSK or M-Quadrature amplitude modulation ).
- Standards used for terrestrial broadcast are 8-level Vestigial Sideband Modulation ( 8VSB ) for over the air, and Quadrature Amplitude Modulation ( QAM ) for cable TV . A typical example of an encodulator are the units from Thor Broadcast.
- An OFDM carrier signal is the sum of a number of orthogonal sub-carriers, with baseband data on each sub-carrier being independently modulated commonly using some type of quadrature amplitude modulation ( QAM ) or phase-shift keying ( PSK ).
- 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.
- Binary phase-shift keying ( BPSK ) is used by standard GPS and GLONASS signals, however both BPSK and quadrature phase-shift keying ( QPSK ) can be considered as variations of quadrature amplitude modulation ( QAM ), specifically QAM-2 and QAM-4.
- The company supplies cable television headend or hub devices that receive digital video or data from the operator network, re-packetizes the video or data into an MPEG transport stream, then digitally modulates the MPEG transport stream onto a downstream RF channel using quadrature amplitude modulation ( QAM ).
- After the above-mentioned quadrature amplitude modulation of the subcarrier, subcarrier sidebands are produced, and the subcarrier itself is filtered out of the visible portion of the video, since it is the subcarrier sidebands that carry all of the U and V information, and the subcarrier itself carries no information.
- The Prelude modem would go on to win what has become known as the " Bellcore ADSL Olympics " in 1993 by performing significantly better than modems using single-carrier modulation techniques, such as quadrature amplitude modulation ( QAM ) and carrierless amplitude phase modulation ( CAP ), including modems from AT & T and Bellcore.
- At certain times, the chrominance signal represents only the U signal, and 70 nanoseconds ( NTSC ) later, the chrominance signal represents only the V signal . ( This is the nature of the quadrature amplitude modulation process that created the chrominance signal . ) About 70 nanoseconds later still,-U, and another 70 nanoseconds,-V.
- The standard for signal transmission over digital cable television systems in the United States is now fixed as both " 64-QAM " and " 256-QAM " ( quadrature amplitude modulation ), which is specified in SCTE 07, and is part of the DVR boxes ), high definition versions of local channels, and some cable channels are available.
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