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— Multi-antenna communication systems have the potential to play an important role in the design of the next generation broadband wireless communication systems. In this paper, we study a single-user multi-antenna system with perfect channel state information (CSI) both at the transmitter and the receiver. Beamforming is used to exploit the perfect channel(More)
— It is well-known that using multiple antennas provides a substantial capacity and diversity increase for wireless communication systems. A multi-input multi-output (MIMO) technique that utilizes the channel knowledge both at the transmitter and the receiver is known as beamforming. Beam-forming separates a MIMO channel into parallel subchannels. It was(More)
  • Bedri A Cetiner, Enis Akay, Ersin Sengul, Ender Ayanoglu
  • 2006
A MIMO system equipped with a new class of antenna arrays, henceforth referred to as multifunction reconfigurable antenna arrays (MRAAs), is investigated. The elements of MRAA, i.e. MRAs presented in this work are capable of dynamically changing the sense of polarization of the radiated field thereby providing two reconfigurable modes of operation, i.e.(More)
This paper addresses the performance of bit-interleaved coded multiple beamforming (BICMB) [1], [2] with imperfect knowledge of beamforming vectors. Most studies for limited-rate channel state information at the transmitter (CSIT) assume that the precoding matrix has an invariance property under an arbitrary unitary transform. In BICMB, this property does(More)
— In this paper we will show and quantify both analytically and via simulations that the use of channel knowledge at the transmitter, the technique known as beamforming, achieves the maximum diversity in space when the best eigenmode is used (single beamforming). Furthermore, we will investigate beamforming in conjunction with next generation wireless local(More)
INTRODUCTION The aim of this study was to evaluate the efficacy of diffusion-weighted images (DWIs) in the differentiation of hydatid cysts (HCs) of the liver. METHODS In this prospective study, 54 patients with 92 HC lesions were evaluated. The mean apparent diffusion coefficient (ADC) values of each lesion were calculated using the ADC maps derived from(More)
Aim. To present a case referred to our clinic with severe right ear pain but without any abnormal finding during otological examination and diagnosed as myocardial infarction and also to draw attention to otalgia which can occur secondary to myocardial infarction. Case Report. An 87-year-old female admitted with right ear pain lasting for nearly 12 hours(More)