Title :
Performance Evaluation of Fast Frequency Hopping OFDM over UWB Channels
Author :
Tarasak, Poramate ; Lin, Zhiwei ; Peng, Xiaoming ; Chin, Francois
Author_Institution :
Inst. for Infocomm Res., Agency for Sci. Technol. & Res., Singapore
Abstract :
The performance of fast frequency hopping OFDM (FFH-OFDM) is evaluated under UWB channels with several types of receivers. It is shown that FFH-OFDM has a significant improvement over a conventional OFDM system. The receiver algorithms for the FFH-OFDM considered in this paper are zero-forcing (ZF), minimum mean square error (MMSE), QR- MMSE and sorted QR-MMSE (SQR-MMSE). Soft-output metric computation is proposed for the coded case that yields further gain over hard-output decision. The simulation results show the advantage of QR-MMSE and sorted QR-MMSE receivers in the uncoded case while MMSE has better performance for the coded case with a convolutional coding scheme. The insight on the performance advantage of MMSE over QR-based receivers for the coded case is also provided.
Keywords :
OFDM modulation; channel coding; convolutional codes; frequency hop communication; least mean squares methods; modulation coding; ultra wideband communication; MMSE; QR-based receiver; UWB channels; convolutional coding scheme; fast frequency hopping OFDM; minimum mean square error; orthogonal frequency division multiplexing system; soft-output metric computation; zero-forcing receiver algorithm; Convolutional codes; Energy consumption; Frequency diversity; Indoor environments; MIMO; Mean square error methods; OFDM; Time domain analysis; Ultra wideband communication; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2009.5073787
