Title :
Quadrature modulation for UWB wireless multipath channels
Author :
Chu, Xiaoli ; Murch, Ross D.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
This paper introduces a quadrature pulse amplitude modulation (QPAM) scheme for ultrawideband (UWB) wireless communications by utilizing two orthogonal pulses. An important advantage of QPAM over binary PAM is that it is more power efficient and this is critical in UWB communications. In addition we investigate the use of M-ary binary-coded QPAM signals to further increase the bit transmission rate supported by UWB communication systems. The power efficiencies of bipolar QPAM and M-ary binary-coded QPAM are compared. We also present a comparison of the role of time hopping (TH) and direct-sequence (DS) spreading in providing robust performance in multipath environments for UWB communications.
Keywords :
binary codes; modulation coding; multipath channels; pulse amplitude modulation; quadrature amplitude modulation; spread spectrum communication; M-ary binary-coded QPAM; binary pulse amplitude modulation; bipolar QPAM; bit transmission rate; direct-sequence spreading; multipath environments; orthogonal pulses; power efficiencies; quadrature modulation; quadrature pulse amplitude modulation; robust performance; time hopping; ultrawideband wireless multipath channels; Amplitude modulation; Bandwidth; Intersymbol interference; Multipath channels; Pulse modulation; Quadrature amplitude modulation; Robustness; Ultra wideband communication; Ultra wideband technology; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
Print_ISBN :
0-7803-7974-8
DOI :
10.1109/GLOCOM.2003.1258275
