Capacitive technologies play an increasingly important role in the fields of industrial and automotive sensors. The noncontact working principle, on the one hand, is the main advantage of this technology; on the other hand, the sensor is thus sensitive to electromagnetic disturbances. This paper describes methods to successfully develop capacitive sensors, which can reliably be operated in hars...

In this paper, the influence and improvement of the localization accuracy achieved using a fingerprint database with information coming from different channels and radio signal strength levels is evaluated. This study uses IEEE 802.15.4 networks with different power levels and carrier frequency channels in the 2.4GHz band. Experimental results show that selecting part of this information with a...

Blind recognition of communication parameters is a research topic of high importance for both military and civilian communication systems. Numerous studies about carrier frequency estimation, modulation recognition as well as channel identification are available in literature. This paper deals with the blind recognition of the space–time block coding (STBC) scheme used in multiple-input–multipl...

Wireless LAN is currently enjoying rapid deployment in University departments, business offices, hospitals and homes. It becomes an inexpensive technology and allows multiple numbers of the households to simultaneously access the internet while roaming about the house. In the present work , the design and development of a wireless LAN is highlighted which utilizes direct sequence spread spectru...

あらまし シングルキャリア(SC)伝送に最小平均二乗誤差(MMSE)規範に基づく周波数領域等化(FDE)を適用す れば,大きな周波数ダイバーシチ効果が得られ優れた伝送特性を達成できる.しかしながら,受信側で受信タイミ ングオフセットが発生すると符号間干渉(ISI)が発生し,ナイキストフィルタのロールオフファクタが大きくなるに つれ伝送特性が劣化してしまう.これまで筆者らは,MMSE-FDE を用いる SC 伝送における受信タイミングオフセ ットによる伝送特性劣化の発生機構を明らかにし,MMSE-FDE に 2 倍オーバーサンプリングとスペクトル合成を適 用することで受信タイミングオフセットによる特性劣化を救済できることを示してきた.従来の FDE 重みは,スペ クトル合成後の誤差を最小とする重みではないため,十分な周波数ダイバーシチ効果を得ることができなかった. 本論文では,スペクト...

Scientists and Technologists involved in the development of radar and remote sensing systems all over the world are now trying to involve themselves in saving of manpower in the form of developing a new application of their ideas in Intelligent Transport system( ITS). The world statistics shows that by incorporating such wireless radar system in the car would decrease the world road accident by...

It is a well-known fact that in carrier wave' transmission it is necessary to provide for the efficient transmission and reception not only of the carrier frequency itself but also for a band of frequencies of width depending on the frequency and character of the signal itself. This necessity is becoming more and more a serious consideration as the severity of wave length regulation and the nec...

A scheme of frequency hopping spread spectrum (FHSS) frequency synthesizer suitable for synthesis of radio-frequency (RF) carrier signal in very high frequency (VHF) band is proposed, implemented and tested. The synthesizer is based on the direct digital frequency synthesis (DDFS or DDS) and phase locked loop (PLL) with dynamic monitoring of varicap’s voltage to reduce switching time. The resul...

Objective(s): Iran is considered as one of the high-prevalence areas for β-thalassemia with a rate of about 10% carrier frequency. Molecular diagnosis of the disease is performed both by direct sequencing and indirectly by the use of polymorphic markers present in the beta globin gene cluster. However, to date there is no reliable information on the application of the markers in the Iranian pop...

We consider how the detection of second-order contrast structure depends on the orientation and spatial frequency of first-order luminance structure. For patterns composed of a bandpass noise carrier multiplied by a contrast envelope function, we show that sensitivity to the envelope varies in proportion to the spatial frequency of the carrier. For oriented carriers at low spatial-frequencies, ...