Sun, 27 Jul 2008 07:47:46 BST CiteULike: dcastro's control http://www.citeulike.org/user/dcastro/tag/control CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774503 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1920-1929.</i><br /><br />Applications of millimeter-wave radar, imaging, and communication technology requires cost-effective implementation of intelligent scanning antenna systems. Injection-locking and phase-locked-loop (PLL) techniques can be used to achieve synchronous operation of a number of antenna array elements, and allow for the manipulation of the phase distribution without additional phase-shifting circuitry, suggesting a potential for low-cost beam-scanning systems. This paper describes a number of techniques, with an assessment of some remaining technical challenges for practical implementation Injection- and phase-locking techniques for beam control [antenna arrays] RA York T Itoh doi:10.1109/22.734513 Microwave Theory and Techniques, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1920-1929. 2008-05-09T06:40:42-00:00 1998 Microwave Theory and Techniques, IEEE Transactions on 46 11 1920 1929 active antenna array beam control pll http://www.citeulike.org/user/dcastro/article/2674421 <i>Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on, Vol. 1 (2000), pp. 147-151 vol.1.</i><br /><br />We study the problem of finding an optimal subcarrier and power allocation strategy for downlink communication to multiple users in an OFDM based wireless system. We formulate the problem of minimizing total power consumption with constraints on BER and transmission rate for users requiring different classes of service, and derive simple algorithms which perform well. We divide the larger problem of joint allocation into two steps. In the first step, the number of subcarriers that each user is determined based on the users' average SNR. Numerical results demonstrate that the proposed low complexity algorithms offer comparable performance with an existing iterative algorithm Subcarrier allocation and power control for OFDMA D Kivanc Hui Liu doi:10.1109/ACSSC.2000.910933 Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on, Vol. 1 (2000), pp. 147-151 vol.1. 2008-04-15T17:40:52-00:00 2000 Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on 1 147 151 vol.1 allocation carrier control ofdma power http://www.citeulike.org/user/dcastro/article/2072437 <i>Communications, Computers and signal Processing, 2005. PACRIM. 2005 IEEE Pacific Rim Conference on (2005), pp. 5-8.</i><br /><br />The IEEE 802.16-2004 standard (formerly 802.16d) has been approved to provide last-mile connectivity to fixed locations by radio links. Although the IEEE committee is working on a future 802.16e standard to support terminal mobility, we believe that adding mobility support to the present standard will offer a significant business opportunity for service providers by enabling them to serve a large pool of potential users whose laptops and PDAs are 802.16-2004 enabled. In our prior work, we have shown how to reuse commands from the 802.16-2004 standard to support handoff between access points without any change to the standard. However, given that the mobile terminals will be severely constrained by battery life, it is essential that new protocols and control mechanisms be devised to save terminal energy, based on the existing 802.16-2004 standard. To achieve this objective, in the present paper we propose protocols and use existing 802.16-2004 commands to put mobile terminals to "sleep" (to save energy) when they are idle, and "wake them up" when there is traffic destined for them. We also demonstrate how this "sleep/wakeup" cycle can is compatible with the handoff process. Protocol and control mechanisms to save terminal energy in IEEE 802.16 networks S Mukherjee KK Leung GE Rittenhouse Communications, Computers and signal Processing, 2005. PACRIM. 2005 IEEE Pacific Rim Conference on (2005), pp. 5-8. 2007-12-07T10:23:59-00:00 2005 Communications, Computers and signal Processing, 2005. PACRIM. 2005 IEEE Pacific Rim Conference on 5 8 80216 control network power http://www.citeulike.org/user/dcastro/article/506609 <i>INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies. IEEE, Vol. 1 (2003), pp. 702-711 vol.1.</i><br /><br />In this paper, we study the problem of joint routing, link scheduling and power control to support high data rates for broadband wireless multihop networks. We first address the problem of finding an optimal link scheduling and power control policy that minimizes the total average transmission power in the wireless multihop network, subject to given constraints regarding the minimum average data rate per link, as well as peak transmission power constraints per node. Multiaccess signal interference is explicitly modeled. We use a duality approach whereby, as a byproduct of finding the optimal policy, we find the sensitivity of the minimal total average power with respect to the average data rate for each link. Since the minimal total average power is a convex function of the required minimum average data rates, shortest path algorithms with the link weights set to the link sensitivities can be used to guide the search for a globally optimum routing. We present a few simple examples that show our algorithm can find policies that support data rates that are not possible with conventional approaches. Moreover, we find that optimum allocations do not necessarily route traffic over minimum energy paths. Optimal routing, link scheduling and power control in multihop wireless networks RL Cruz AV Santhanam INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies. IEEE, Vol. 1 (2003), pp. 702-711 vol.1. 2006-02-16T02:47:30-00:00 2003 INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies. IEEE 1 702 711 vol.1 control multihop network power routing wireless http://www.citeulike.org/user/dcastro/article/1899112 <i>Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, Vol. 3 (2002), pp. 1744-1748 vol.3.</i><br /><br />Maximizing the total rate with no coordination is an attractive option to increase the throughput of existing multiuser communication systems. This paper compares two sub-optimal methods for rate and power allocation in a two-user multicarrier channel with the optimum method, subject to individual power constraints. The two suboptimal methods, iterative water-filling (IW) and iterative constant-power transmission (ICP), closely approximate the performance of the optimum method when either interference-channel magnitude is smaller than the main-path gain or the total power budget is small. Both methods perform nearly alike and are easy to deploy in existing systems in which different transmission paths may not be coordinated. Rate and power control in a two-user multicarrier channel with no coordination: the optimal scheme vs. suboptimal methods Seong Chung JM Cioffi Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, Vol. 3 (2002), pp. 1744-1748 vol.3. 2007-11-11T16:38:55-00:00 2002 Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th 3 1744 1748 vol.3 channel control multicarrier power