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The mobile industry is constantly pushing the envelope to construct smaller and more versatile wireless appliances. In contemporary designs, multiple wireless systems are introduced into the mobile terminal such as GSM/EDGE/3G TX and RX, Bluetooth, WLAN, GPS and perhaps even DVB-H, UWB. High data rate components such as camera (5MP+), display (QVGA+) and hi-speed internal memories and I/O-channels...
Tomorrows mobile terminals shall be multi-standard platforms for various kinds of wireless applications. So far, nowadays mobiles consist of a combination of different separated modules e.g. for GSM, for Bluetooth, WLAN, etc.. Along with these different modules typically separated antennas are use, such as one for GSM/UMTS and another one for Bluetooth and yet another one for FM radio. Currently the...
The traditional way of evaluating receiver sensitivity is to measure the Total Isotropic Sensitivity (TIS) in an anechoic environment. Very few wireless terminals with small antennas are used in an anechoic environment. This paper will describe three alternative methods to measure the receiver sensitivity in a reverberation chamber, each of which can be done in less than 10 minutes which is much faster...
Multiple input, multiple output (MIMO) is an antenna technology for wireless communications in which multiple antennas are used at both the source (transmitter) and the destination (receiver). The antennas at each end of the communications circuit are combined to minimize the errors and to optimize the data speed. MIMO-based antennas are of interest in relation to communication such as digital TV,...
In this paper, a low-complexity two-stage decision-directed receiver is proposed for a code- division multiple access (CDMA) multiple-input multiple-output (MIMO) system using space-time block coding (STBC) over a multipath fading channel. In contract to the conventional receivers, the proposed blind receiver can provide a reliable performance without requirement of the pilot symbols.
In this paper, we have shown that it was still possible to get a very good diversity system gain for very closely spaced UMTS PIFAs (0.027 lambda0) positioned on the PCB of a small communicating object by using the neutralization technique. The goal is to see how efficient can be the neutralization technique when the radiators are separated by a very small distance or in other terms, how close can...
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