Sun, 06 Jul 2008 10:57:42 BST CiteULike: dcastros Andrews http://www.citeulike.org/user/dcastro/author/Andrews CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774502 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206.</i><br /><br />Active patch antennas are simple to fabricate, compact, and low cost, but have inherently poor phase noise and stability. In this paper, a phase-locked loop (PLL) integrated with a 4-GHz active patch antenna was investigated in order to reduce the phase noise and stabilize the frequency of the oscillator. Both these aims were realized by careful integration and optimization of the PLL parameters. Experimental results showed that a phase noise reduction in excess of 55 dB was achieved using this technique. A standalone voltage-controlled oscillator and passive patch technique can provide lower phase noise, but the active patch lends itself to effective integration. Measurement techniques were demonstrated to measure the phase noise and stability of the patch oscillator Phase-locked-loop control of active microstrip patch antennas JW Andrews PS Hall doi:10.1109/22.981266 Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 1. (2002), pp. 201-206. 2008-05-09T06:40:39-00:00 2002 Microwave Theory and Techniques, IEEE Transactions on 50 1 201 206 active antenna microstrip patch pll http://www.citeulike.org/user/dcastro/article/2759133 <i>Electronics Letters, Vol. 34, No. 9. (1998), pp. 833-835.</i><br /><br />A phase locked loop (PLL) method for controlling a 4 GHz active patch antenna was investigated in order to both frequency stabilise the oscillator and to reduce the phase noise; both these aims were achieved by optimising the PLL parameters. Experimental results showed that a phase noise reduction of up to 26 dB was realised Oscillator stability and phase noise reduction in phase locked active microstrip patch antenna JW Andrews PS Hall Electronics Letters, Vol. 34, No. 9. (1998), pp. 833-835. 2008-05-05T20:24:19-00:00 1998 Electronics Letters 34 9 833 835 active antenna integrated microstrip patch http://www.citeulike.org/user/dcastro/article/2759132 <i>Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on (1998), pp. 285-288.</i><br /><br />Active microstrip patch antennas have been stabilised using cavity-backed and phase-locked-loop (PLL) controlled techniques. Experimental results show that phase noise reductions of up to 25 and 26 dB respectively can be realised Active integrated antenna oscillator stability and phase noise reduction M Zheng JW Andrews PS Hall P Gardner Q Chen VF Fusco doi:10.1109/ICMMT.1998.768281 Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on (1998), pp. 285-288. 2008-05-05T20:24:15-00:00 1998 Microwave and Millimeter Wave Technology Proceedings, 1998. ICMMT '98. 1998 International Conference on 285 288 active antenna integrated http://www.citeulike.org/user/dcastro/article/2135062 <i>Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 12, No. 2. (2005), pp. 19-29.</i><br /><br />Cellular networks today are interference-limited and only becomes increasingly so in the future due to the many users that need to share the spectrum to achieve high-rate multimedia communication. Despite the enormous amount of academic and industrial research in the past 20 years on interference-aware receivers and the large performance improvements promised by these multi-user techniques, today's receivers still generally treat interference as background noise. In this article, we enumerate the reasons for this widespread scepticism, and discuss how current and future trends increases the need for and viability of multi-user receivers for both the uplink, where many asynchronous users are simultaneously detected, and the downlink, where users are scheduled and largely orthogonalized; but the mobile handset still needs to cope with a few dominant interfering base stations. New results for interference cancelling receivers that use conventional front-ends are shown to alleviate many of the shortcomings of prior techniques, particularly for the challenging uplink. This article gives an overview of key recent research breakthroughs on interference cancellation and highlights system-level considerations for future multi-user receivers. Interference cancellation for cellular systems: a contemporary overview JG Andrews Wireless Communications, IEEE [see also IEEE Personal Communications], Vol. 12, No. 2. (2005), pp. 19-29. 2007-12-17T06:52:06-00:00 2005 Wireless Communications, IEEE [see also IEEE Personal Communications] 12 2 19 29 channel interference mobile systems http://www.citeulike.org/user/dcastro/article/718163 <i>Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 129-136.</i><br /><br />The IEEE 802.16 family of standards and its associated industry consortium, WiMax, promise to deliver high data rates over large areas to a large number of users in the near future. This exciting addition to current broadband options such as DSL, cable, and WiFi promises to rapidly provide broadband access to locations in the world's rural and developing areas where broadband is currently unavailable, as well as competing for urban market share. WiMax's competitiveness in the marketplace largely depends on the actual data rates and ranges that are achieved, but this has been difficult to judge due to the large number of possible options and competing marketing claims. This article first provides a tutorial overview of 802.16. Then, based on extensive recent studies, this article presents the realistic attainable throughput and performance of expected WiMax compatible systems based on the 802.16d standard approved in June 2004 (now named 802.16-2004). We also suggest future enhancements to the standard that could at least quadruple the achievable data rate, while also increasing the robustness and coverage, with only moderate complexity increases. Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential A Ghosh DR Wolter JG Andrews R Chen doi:10.1109/MCOM.2005.1391513 Communications Magazine, IEEE, Vol. 43, No. 2. (2005), pp. 129-136. 2006-06-30T20:09:07-00:00 2005 Communications Magazine, IEEE 43 2 129 136 80216 broadband wimax wireless