نتایج جستجو برای: base station antenna
تعداد نتایج: 337936 فیلتر نتایج به سال:
The existence of inpatient public health centers in remote areas needs to be supported with a data communication telemedicine system. The system includes remote station at each public health center which consists of telemedicine sensors such as the blood pressure monitor, the body temperature sensor, the electrocardiograph, the psych meter, and the heart rate monitor. The sensor circuits are co...
The paper considers downlink space-time block coding with a pre-filtering technique for time division duplex MCCDMA. We consider the use of antenna arrays at the base station (BS) and a single antenna at the mobile terminal. The space-time block codes allow that the spatial diversity be efficiently exploited and the multi-user pre-filtering technique allows to format the transmitted signals so ...
The impact of transmit-antenna spacing and signal-to-noiseratio on channel capacity has been measured intensively in a variety of scenarios. When looking at the physical layer throughput of a multiantenna communication system, the behavior over antenna spacing may look completely different, leading to other conclusions regarding the optimal antenna distance. In this paper, we compare —by testbe...
Performance Analysis of Adaptive Beamforming Written by Administrator Thursday, 19 May 2011 04:39 Last Updated Thursday, 19 May 2011 04:44 The current wireless cellular base station antenna system employs switched beam technology which suffers from its inefficiency to track the user and limited capacity. The Smart antenna technology which tracks the mobile user continuously by steering the main...
Space-division multiple-access (SDMA) systems that employ multiple antenna elements at the base station can provide much higher capacity than single-antenna-element systems. A fundamental question to be addressed concerns the ultimate capacity region of an SDMA systemwherein a number of mobile users, each constrained in power, try to communicate with the base station in a multipath fading envir...
In this paper, we report the design and evaluation of a compact 108-element base station antenna array for massive multi-input multi-output (MIMO) system using a 3-port multimode antenna as a unit element. Of these three ports, port 1 and port 2 have orthogonally polarized broadside radiation pattern with measured peak gain of 6.5 dBi and impedance bandwidth of 254MHz (2.268GHz– 2.522GHz) and 2...
Recently, there has been considerable interest in using antenna arrays in wireless communication networks to increase the capacity and decrease the cochannel interference. Adaptive beamforming with smart antennas at the receiver increases the carrier-to-interference ratio (CIR) in a wireless link. This paper considers a wireless network with beamforming capabilities at the receiver which allows...
Performance Analysis of Adaptive Beamforming Written by Administrator Thursday, 19 May 2011 04:39 Last Updated Thursday, 19 May 2011 04:44 The current wireless cellular base station antenna system employs switched beam technology which suffers from its inefficiency to track the user and limited capacity. The Smart antenna technology which tracks the mobile user continuously by steering the main...
Performance Analysis of Adaptive Beamforming Written by Administrator Thursday, 19 May 2011 04:39 Last Updated Thursday, 19 May 2011 04:44 The current wireless cellular base station antenna system employs switched beam technology which suffers from its inefficiency to track the user and limited capacity. The Smart antenna technology which tracks the mobile user continuously by steering the main...
In the previous study, the author has proposed a simplified propagation modeling and a performance evaluation scheme of MIMO antennas, which utilizes the ideal base-station antenna configuration so that the angular power spectrum model for the user terminal is applicable for Kronecker MIMO model. By utilizing this modeling concept, this paper considers the impact of the concentrated azimuth pow...
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