Title :
Performance evaluation of an OFDM-based LMDS using measured channel models
Author :
Ravi, K.V. ; Guo, D. ; Cheah, K.L.
Author_Institution :
Center for Wireless Commun., Singapore
Abstract :
In this paper, the use of orthogonal frequency division multiplexing (OFDM) for LMDS is proposed and investigated. The studies here utilise statistical channel models derived from our earlier field measurements in Singapore and present a more realistic assessment of the proposed system performance. The simulation model considers RS/CC coding, convolutional interleaving and multilevel QPSK/QAM signaling. Robust performance is demonstrated under realistic SNRs for a wide range of system conditions. Recommendations for the choice of a suitable set of OFDM parameters like FFT length and cyclic prefix are presented. The performance of the proposed scheme is also compared with that of an LMS equaliser-based system and shown to be superior under similar channel conditions
Keywords :
OFDM modulation; Reed-Solomon codes; channel coding; convolutional codes; fading channels; interleaved codes; modulation coding; quadrature amplitude modulation; quadrature phase shift keying; radio access networks; telecommunication signalling; time-varying channels; FFT length; OFDM-based LMDS; RS/CC coding; SNR; Singapore; convolutional interleaving; cyclic prefix; measured channel models; multilevel QPSK/QAM signaling; orthogonal frequency division multiplexing; performance evaluation; statistical channel models; Convolutional codes; Delay; Equalizers; Intersymbol interference; Least squares approximation; OFDM modulation; Quadrature amplitude modulation; Robustness; System performance; Wireless communication;
Conference_Titel :
Wireless Communications and Networking Confernce, 2000. WCNC. 2000 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-6596-8
DOI :
10.1109/WCNC.2000.904859
