64-QAM

AcronymDefinition
64-QAM64-State Quadrature Amplitude Modulation
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Some common forms of QAM are 16-QAM, 32-QAM, 64-QAM, 128-QAM, and 256-QAM.
The communication outside the systems uses the Orthogonal Frequency-Division Multiplexing (OFDM) with 64-Quadrature Amplitude Modulation (64-QAM) wireless hub.
It can operate at rates up to 64Gbaud with modulation schemes such as 64-QAM.
The effect has been shown for 64-QAM using NMSE and CRLB in Fig.
Figure 3: 802.11n versus 802.11ac Technology Comparison 802.11n 802.11ac Transmit Frequency 2.4 or 5 GHz 5 GHz only Channel Bandwidth 20 or 40 MHz 80 or 160 MHz Modulation 64-QAM 256-QAM Maximum Number of Spatial Streams 4 8 Theoretical Maximum Data Rate per Stream 144 Mb/S 866 Mb/s Theoretical Maximum Data Rate 576 Mb/S 6.93 Gb/s Because of the variables of channel bandwidth and number of spatial streams, 802.11ac deployments are highly configurable.
Ademas 11 dB oscila entre 184 bits por frame con relacion al tipo de modulacion QPSK 1/2 y 280 bits por frame que es modulacion QPSK 3/4, 12 dB oscila entre 376 bits por frame en modulacion 16 QAM 1/2, y 280 bits por frame por modulacion QPSK 3/4, 22 dB fluctua entre 568 bits por frame con relacion al tipo de modulacion 16 QAM 3/4 y 760 bits por frame en modulacion 64 QAM 2/3, 29 dB cambia entre 760 bits por frame por modulacion 64 QAM 2/3 y 856 bits por frame con relacion al tipo de modulacion 64-QAM 3/4.
And for 16-QAM and 64-QAM, the data rate can be 11.14 Gbps and 13.19 Gbps.
The 16-QAM and the 64-QAM signals with different frequency bandwidths are sent at a carrier frequency of 2.0 GHz to both the SPR and the low-IF receivers.
Spectral MCS efficiency Required index Modulation Code rate [N.sub.DBPS] (bps/Hz) SNR (dB) 0 BPSK 1/2 26 0.5 -3.83 1 QPSK 1/2 52 1 0 2 QPSK 3/4 78 1.5 2.62 3 16-QAM 1/2 104 2 4.77 4 16-QAM 3/4 156 3 8.45 5 64-QAM 2/3 208 4 11.67 6 64-QAM 3/4 234 4.5 13.35 7 64-QAM 5/6 260 5 14.91 8 256-QAM 3/4 312 6 17.99 9 256-QAM 5/6 Not valid
-- Automatic detection of modulation type (64-QAM or 256-QAM) and DOCSIS on downstream channels and lock on 4 upstream frequencies for faster setup and analysis
An input stream is demultiplexed into v sub-streams, where v = 2 for QPSK, v = 4 for 16-QAM, and v = 6 for 64-QAM.
Huang, "A 4 x 4 64-QAM reduced-complexity k-best MIMO detector up to 1.5 Gbps," in Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS '10), pp.