Wed, 09 Jul 2008 13:33:21 BST CiteULike: dcastros Jimenez http://www.citeulike.org/user/dcastro/author/Jimenez CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2845130 <i>Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, Vol. 5 (2004), pp. 3373-3377 Vol. 5.</i><br /><br />In this paper bit-loading techniques have been applied to an H-OFDM system in an ad-hoc WLAN environment. The effect on the performance of the channel estimation errors has been analyzed showing that due to the proposed channel estimation procedure this effect is not very important. Also an upper-bound for the mean number of bits per OFDM symbol is derived. Those results show that the complexity introduced in order to manage the ad-hoc scenario and bit-loading techniques is worthwhile because of the good behaviour obtained. Bit-loaded H-OFDM to increase capacity in WLAN/WPAN VPG Jimenez AG Armada doi:10.1109/VETECF.2004.1404689 Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, Vol. 5 (2004), pp. 3373-3377 Vol. 5. 2008-05-29T16:22:15-00:00 2004 Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th 5 3373 3377 Vol. 5 bit-loading ofdm http://www.citeulike.org/user/dcastro/article/1092089 <i>Wireless Personal Communications, Vol. 40, No. 3. (February 2007), pp. 387-399.</i> Multi-user Synchronisation in ad hoc OFDM-based Wireless Personal Area Networks Jimenez Victor Armada Ana doi:10.1007/s11277-006-9198-3 Wireless Personal Communications, Vol. 40, No. 3. (February 2007), pp. 387-399. 2007-02-07T09:57:12-00:00 2007 Wireless Personal Communications 0929-6212 40 3 387 399 Springer ofdm synchronization http://www.citeulike.org/user/dcastro/article/2845129 <i>Consumer Electronics, IEEE Transactions on, Vol. 50, No. 4. (2004), pp. 1016-1025.</i><br /><br />An efficient implementation of several tasks at the receiver becomes crucial in OFDM-based high-speed WLAN systems, such as automatic gain control, time and frequency synchronization, and offset tracking. This paper deals with fixed point constraints and accuracy requirements for implementation of those algorithms. Also, a complete set of thresholds for the practical implementation of time and frequency synchronization sub-blocks is obtained. Moreover, a technique to mitigate the remaining frequency offset after coarse acquisition is proposed, yielding a good trade-off between performance and complexity. Finally, we propose the implementation of a simple and effective automatic gain control procedure. Design and implementation of synchronization and AGC for OFDM-based WLAN receivers VPG Jimenez MJFG Garcia FJG Serrano AG Armada doi:10.1109/TCE.2004.1362493 Consumer Electronics, IEEE Transactions on, Vol. 50, No. 4. (2004), pp. 1016-1025. 2008-05-29T16:22:13-00:00 2004 Consumer Electronics, IEEE Transactions on 50 4 1016 1025 ofdm synchronization http://www.citeulike.org/user/dcastro/article/2774607 <i>Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 2 (1998), pp. 455-458 vol.2.</i><br /><br />This paper describes a high efficiency amplifier that uses the load presented by a patch antenna to work in class “E”. The resulting set is a high efficiency transmitting active antenna. The dimensions, shape and location of the feeding point in the antenna are selected to obtain an input impedance to force the transistor to work in class “E” at 885 MHz with very high collector efficiency: ηc=90%@Vcc=12.5, Pout=1.5 W High efficiency mode “E” amplifier powers high efficiency active transmitting patch antenna Ortega Asensio Gonzalez Jimenez Martin doi:10.1109/MWSYM.1998.705031 Microwave Symposium Digest, 1998 IEEE MTT-S International, Vol. 2 (1998), pp. 455-458 vol.2. 2008-05-09T07:26:00-00:00 1998 Microwave Symposium Digest, 1998 IEEE MTT-S International 2 455 458 vol.2 active amplifier antenna efficiency high patch transmitter