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.
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.