To create a next-generation mobile satellite communication system that offers large communication capacity, the onboard antenna system must be a multi-beam system consisting of a light weight 20-m class reflector and a light weight 100-beam class antenna feed system. We clarify that the antenna gain decrease created by the reflector surface distortion in orbit is relatively large. This paper pr...

This paper offers a complete view about the smart antenna which is the vital part of wireless mobile communications. As we steadily march towards the world of wireless digital communication , smart antenna plays a key role in transmission and reception of digital data. Smart antenna significantly improves wireless system performance and economics for a range of potential users. This paper expla...

A compact multiband handset antenna including MIMO antenna operation for LTE 13 band (746 ∼ 787MHz) applications is proposed. The proposed antennas are separately located on the top and bottom portions of a mobile handset in order to use the antenna area more effectively. The proposed antenna achieves isolations of higher than 14 dB, enveloped correlation coefficients (ECC) of less than 0.25, a...

A novel antenna design with a low specific absorption rate (SAR) is introduced. The has very profile and it designed to be placed on the back cover of mobile device at around 2 GHz. solution based nested loops which distribute field over large volume so that maximum SAR value remains relatively in user’s tissue. proposed also provides good efficiency, considering extremely profile, close proxim...

Nowadays, many buildings are equipped with a WLAN infrastructure, as an inexpensive communication technology. In this paper a method to estimate position and heading (pose) of a mobile robot using WLAN technology is described. The proposed technique for localizing a mobile robot is based on the use of received signal strength values of WLAN access points in range. A radio map based method and E...

The MC-CDMA (multi-carrier code division multiple access) technique is known to be appropriate for high data-rate wireless communications such as mobile multimedia communication due to its robustness to multipath fading and its capability of handling high data rates with a simple onetap equalizer. In this paper, the performance of an MC-CDMA system employing antenna array at the base station in...

We present MUSIC type algorithm for joint parameter estimation in asynchronous DS CDMA system with multiple antenna system at base station and single antenna system at the mobile users. The proposed algorithm is applied in downlink processing and it enables the joint estimation of time delay, frequency shift as well as spatial parameters (direction of departure DOD of transmitted signal) of asy...