Advanced techniques to improve the performance of OFDM Wireless LAN
Ha, Tri T.
Borden, Brett H.
MetadataShow full item record
OFDM systems have experienced increased attention in recent years and have found applications in a number of diverse areas including telephone-line based ADSL links, digital audio and video broadcasting systems, and wireless local area networks (WLAN). Orthogonal frequency-division multiplexing (OFDM) is a powerful technique for high data-rate transmission over fading channels. However, to deploy OFDM in a WLAN environment, precise frequency synchronization must be maintained and tricky frequency offsets must be handled. In this thesis, various techniques to improve the data throughput of OFDM WLAN are investigated. A simulation tool was developed in Matlab to evaluate the performance of the IEEE 802.11a physical layer. We proposed a rapid time and frequency synchronization algorithm using only the short training sequence of the IEEE 802.11a standard, thus reducing the training overhead to 50%. Particular attention was paid to channel coding, block interleaving and antenna diversity. Computer simulation showed that drastic improvement in error rate performance is achievable when these techniques are deployed.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Hsu, Yu-Chih. (Monterey California. Naval Postgraduate School, 2005-12);There has recently been growing interest in the use of acoustic particle velocity measurements for sonar system applications such as source localization. It is expected that acoustic particle velocity sensors or "vector" ...
Sawyers, William Alan. (Monterey, California. Naval Postgraduate School, 1995-09);The Marine Air Ground Task Force( MAGTF) Tactical Warfare Simulation (MTWS) is a computer-assisted wargame being developed to provide a cost effective, yet realistic, training environment for Marine commanders and their ...
Past performance in supplier certification program : a study of current certification and incentive practices in certified supplier programs Ambrose, Matthew H (Monterey, California. Naval Postgraduate School, 1997-06);Since the mid l98Os both Government and private sector buying organizations have used certified supplier programs to improve the quality of their supplier base. Certified supplier programs improve a company's suppliers by ...