ENHANCING MB-OFDM THROUGHPUT WITH DUAL CIRCULAR 32-QAM

    Ultra-Wideband (UWB) technology was historically employed in military radar systems. Recently UWB systems were proposed to standardize wide bandwidth wireless communication systems, particularly for Wireless Personal Area Networks (WPAN). The fundamental issue of UWB is that the transmitted signal can be spread over an extremely large bandwidth with a very low Power Spectral Density (PSD).
    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. A Dual Circular 32-QAM (DC 32-QAM) modulator is proposed as an alternative modulation scheme that fits into the existing ECMA-368 standard structure with the objective to map more information bits onto an OFDM symbol, while at the same time providing enough Euclidean symbol distance to maintain successful transmission in multipath environments at the higher data rates. The system performance for DC 32-QAM modulation is designed using Matlab programming and compared with 16-QAM and DCM in Foerster’s Channel Model 1 (CM1) and (CM4).

Reference Paper: Enhancing MB-OFDM Throughput with Dual Circular 32-QAM
Author’s Name: Runfeng Yang, and R. Simon Sherratt
Year:2008
Source: IEEE

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