It is known that if a conductor resides in the neighboring of an antenna with a small distance relative to the wavelength, it induces a reverse current on the conductor. This paper involves the unavoidable coupling effects on some common types of LF antennas, due to the large wavelength in this frequency band. In particular, after some discussions about top-loaded antennas, the coupling effect ...

We consider the watchman route problem for a k-transmitter watchman: standing at point p in polygon P, can see $$q\in P$$ if $$\overline{pq}$$ intersects P’s boundary most k times—q is k-visible to p. Traveling along route, either all points P or discrete set of $$S\subset must be watchman. aim minimizing length route. show that even simple polygons shortest NP-complete and cannot approximated ...

We analyze wireless communication systems employing multiple-transmit multiplereceive antennas in this thesis. Space-time codes have been proposed in the literature as an e cient means of coding over multiple transmit antennas. In particular, the rank and the determinant of code di erence matrices have been shown to be important in the design of space time codes in quasi-static fading channels....

This papers designs the identification method of transmitter recognition in wireless networks by analyzing the wireless networks and the physical frame structure of China Mobile Multimedia Broadcasting(CMMB) system. The method calculates the time from the signal of preset transmitter to the measurement site according to the preset transmitter location information, the measured identification si...

This paper concerns power allocation in relay-assisted wireless channels for two-hop transmission. First, the transmitter sends the information to both the relay and receiver parts. Next, in the second hop, the transmitter cooperates with the relay to increase the received signal to noise ratio (SNR), assuming the relay makes use of the Amplify and Forward (AF) strategy. Moreover, it is assumed...