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Improved and optimal dual circular 32-QAM for MB-OFDM
Quadrature Phase Shift Keying (QPSK) and
Dual Carrier Modulation (DCM) are currently used as the
modulation schemes for Multiband Orthogonal Frequency
Division Multiplexing (MB-OFDM) in the ECMA-368 defined
Ultra-Wideband (UWB) radio platform. ECMA-368 has been
chosen as the physical radio platform for many systems
including Wireless USB (W-USB), Bluetooth 3.0 and Wireless
HDMI; hence ECMA-368 is an important issue to consumer
electronics and the users’ experience of these products.
To enable the transport of high-rate USB, ECMA-368 offers
up to 480 Mb/s instantaneous bit rate to the Medium Access
Control (MAC) layer, but depending on radio channel
conditions dropped packets unfortunately result in a lower
throughput. This paper presents improvement on a high data
rate modulation scheme that fits within the configuration of
the current standard increasing system throughput by
achieving 600 Mb/s (reliable to 3.2 meters) thus maintaining
the high rate USB throughput even with a moderate level of
dropped packets. The modulation system is termed improved
and optimal Dual Circular 32-QAM (DC 32-QAM). The
system performance for improved and optimal DC 32-QAM
modulation is presented and compared with previous DC 32-
QAM, 16-QAM and DCM