Title :
A Novel Preamble Scheme for Packet-Based OFDM WLAN
Author :
Wang, Ying ; Oostveen, Job ; Filippi, Alessio ; Wesemann, Stefan
Author_Institution :
Philips Res. Labs., Eindhoven
Abstract :
In packet-based OFDM WLAN systems (IEEE 802.11a/g/n), each packet has a fixed-length preamble for synchronization and channel estimation purposes. The preamble carries no data information and hence causes considerable overhead during transmission when the payload is short and the data rate is high. In this work, we propose a new scheme, called superimposed preamble, to improve the efficiency of 802.11a alike systems. We design a new signal structure using variable data rate and propose an efficient receiver processing scheme to perform joint training (time and frequency synchronization and channel estimation) and data detection. It is shown that the proposed superimposed preamble system achieves training performance similar to the conventional 802.11a systems while gaining in robustness because of the reduced overhead.
Keywords :
IEEE standards; OFDM modulation; channel estimation; packet radio networks; synchronisation; wireless LAN; IEEE 802.11a/g/n; channel estimation; data detection; fixed-length preamble; frequency synchronization; orthogonal frequency division multiplexing; packet-based OFDM WLAN; receiver processing scheme; signal structure; superimposed preamble; time synchronization; variable data rate; Channel estimation; Communications Society; Communications technology; Frequency synchronization; Interference; Laboratories; OFDM; Payloads; Telecommunication traffic; Wireless LAN;
Conference_Titel :
Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Conference_Location :
Kowloon
Print_ISBN :
1-4244-0658-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2007.279