Title :
OFDM symbol shaping for reducing D/A requantization error in multiband UWB systems
Author :
Chung, Sung-Won ; Park, Kyu-Ho
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
We propose a mixed-mode orthogonal frequency domain multiplexing (OFDM) symbol shaping scheme to reduce digital-to-analog (D/A) requantization error in multiband OFDM ultra-wideband (UWB) systems. This method enhances system BER performance without reducing quantization step size. Otherwise, it can decrease D/A converter implementation complexity while maintaining the same system BER. We show that the D/A requantization error is reduced by digital-domain OFDM symbol scaling before D/A conversion and analog-domain inverse scaling after D/A conversion. This scheme gains more efficiency as the average PAR (peak-to-average-power ratio) of OFDM symbols increases. Simulation results show SNR improvement by the proposed scheme in IEEE P802.15.3a-compliant 480-Mbit/s UWB transmission.
Keywords :
OFDM modulation; computational complexity; digital-analogue conversion; error statistics; personal area networks; quantisation (signal); ultra wideband communication; wireless sensor networks; 3.1 to 10.6 GHz; 480 Mbit/s; BER performance; D/A requantization error; IEEE P802.15.3a; PAPR; PAR; analog-domain inverse scaling; complexity; digital-domain OFDM symbol scaling; digital-to-analog requantization error; mixed-mode OFDM symbol shaping; multiband UWB systems; orthogonal frequency domain multiplexing; peak-to-average-power ratio; ultra-wideband systems; wireless PAN; wireless personal area network; wireless sensor network; Bandwidth; Baseband; Bit error rate; Computer errors; Local oscillators; OFDM modulation; Peak to average power ratio; Ultra wideband technology; Wireless LAN; Wireless sensor networks;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1405055