Monthly Archives: June 2014

Comparison of measured rain attenuation in the 10.982-GHz band with predictions and sensitivity analysis

2016-02-10T09:52:24+00:00

SUMMARY The campaign to collect rain attenuation data on terrestrial links had commenced in Malaysian tropical climates for almost two decades. The terrestrial data so far collected have been greatly utilized to derive useful statistics for various microwave applications, such as frequency scaling, rain rate conversion factor, 1-min rain rate contour maps, wet antenna losses, [...]

Comparison of measured rain attenuation in the 10.982-GHz band with predictions and sensitivity analysis 2016-02-10T09:52:24+00:00

Exploiting cognitive radios for reliable satellite communications

2016-02-10T09:52:32+00:00

SUMMARY Satellite transmissions are prone to both unintentional and intentional RF interference. Such interference has significant impact on the reliability of packet transmissions. In this paper, we make preliminary steps at exploiting the sensing capabilities of cognitive radios for reliable satellite communications. We propose the use of dynamically adjusted frequency hopping (FH) sequences for satellite [...]

Exploiting cognitive radios for reliable satellite communications 2016-02-10T09:52:32+00:00

A pre-emption framework for UMTS compatible satellite system supporting multimedia traffic

2016-02-10T09:52:40+00:00

SUMMARY The pre-emption procedure is an important part of the radio resource management when dealing with the emergency traffic. It allows resources to be allocated to higher priority connections by pre-empting lower priority connections. The provision of the pre-emption mechanism becomes much more important in the case of satellite systems such as the Inmarsat Broadband [...]

A pre-emption framework for UMTS compatible satellite system supporting multimedia traffic 2016-02-10T09:52:40+00:00

An improved authentication scheme for mobile satellite communication systems

2016-02-10T09:52:47+00:00

SUMMARY Recently, Lee et al. proposed a simple and efficient authentication scheme for mobile satellite communication systems. However, we find that their scheme is vulnerable to the smart card loss attack, the denial of service attack and the replay attack. To overcome the weaknesses of Lee et al.'s scheme, we proposed an authentication scheme for [...]

An improved authentication scheme for mobile satellite communication systems 2016-02-10T09:52:47+00:00

Experimental detection of mobile satellite transmissions with cyclostationary features

2016-02-10T09:52:55+00:00

ABSTRACTOne of the important functions of cognitive radio (CR) technology is spectrum sensing. The implementation of an efficient spectrum sensing function can be quite challenging because of various factors such as multi-path fading, low signal-to-noise ratio of the radio communication services to be detected and the requirement to detect and analyze the signal in a [...]

Experimental detection of mobile satellite transmissions with cyclostationary features 2016-02-10T09:52:55+00:00