3 research outputs found
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Enhancing MB-OFDM throughput with dual circular 32-QAM
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 an alternative high data rate modulation scheme that fits within the configuration of the current standard increasing system throughput by achieving 600 Mb/s (reliable to 3.1 meters) thus maintaining the high rate USB throughput even with a moderate level of dropped packets. The modulation system is termed Dual Circular 32-QAM (DC 32-QAM). The system performance for DC 32-QAM modulation is presented and compared with 16-QAM and DCM1
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Fixed point dual carrier modulation performance for wireless USB
Dual Carrier Modulation (DCM) is currently used
as the higher data rate modulation scheme 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 user’s experience of these products.
In this paper, Log Likelihood Ratio (LLR) demapping method
is used for the DCM demaper implemented in fixed point model.
Channel State Information (CSI) aided scheme coupled with the
band hopping information is used as the further technique to
improve the DCM demapping performance. The receiver
performance for the fixed point DCM is simulated in realistic
multi-path environments