TY - GEN
T1 - Frequency-domain oversampling for zero-padded OFDM in underwater acoustic communications
AU - Wang, Zhaohui
AU - Zhou, Shengli
AU - Giannakis, Georgios B.
AU - Berger, Christian R.
AU - Huang, Jie
PY - 2010
Y1 - 2010
N2 - Although time-domain oversampling of the received baseband signal is common for single-carrier transmissions, the counterpart of frequency-domain oversampling is rarely used for multicarrier transmissions. In this paper, we explore frequency-domain oversampling to improve the system performance of zero-padded OFDM transmissions over underwater acoustic channels with large Doppler spread. We use a signal design that enables separate sparse channel estimation and data detection, rendering a low complexity receiver. Based on both simulation and experimental results, we observe that the receiver with frequency-domain oversampling outperforms the conventional one considerably in channels with moderate and large Doppler spreads, and the gain increases as the Doppler spread increases. Although a raised-cosine pulse-shaping window can be used to improve the system performance relative to a rectangular window at the expense of data rate reduction, the performance gain is much less than that brought by frequency-domain oversampling in the considered OFDM system for Doppler spread channels.
AB - Although time-domain oversampling of the received baseband signal is common for single-carrier transmissions, the counterpart of frequency-domain oversampling is rarely used for multicarrier transmissions. In this paper, we explore frequency-domain oversampling to improve the system performance of zero-padded OFDM transmissions over underwater acoustic channels with large Doppler spread. We use a signal design that enables separate sparse channel estimation and data detection, rendering a low complexity receiver. Based on both simulation and experimental results, we observe that the receiver with frequency-domain oversampling outperforms the conventional one considerably in channels with moderate and large Doppler spreads, and the gain increases as the Doppler spread increases. Although a raised-cosine pulse-shaping window can be used to improve the system performance relative to a rectangular window at the expense of data rate reduction, the performance gain is much less than that brought by frequency-domain oversampling in the considered OFDM system for Doppler spread channels.
KW - Doppler spread
KW - Frequency-domain oversampling
KW - Inter-carrier interference
KW - OFDM
KW - Zero-padding
UR - http://www.scopus.com/inward/record.url?scp=79551620467&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79551620467&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2010.5683290
DO - 10.1109/GLOCOM.2010.5683290
M3 - Conference contribution
AN - SCOPUS:79551620467
SN - 9781424456383
T3 - GLOBECOM - IEEE Global Telecommunications Conference
BT - 2010 IEEE Global Telecommunications Conference, GLOBECOM 2010
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 53rd IEEE Global Communications Conference, GLOBECOM 2010
Y2 - 6 December 2010 through 10 December 2010
ER -