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Cooperative communication using rateless codes, in which the source transmits an infinite number of parity bits to the destination until the receipt of an acknowledgment, has recently attracted considerable interest. It provides a natural and efficient mechanism for accumulating mutual information from multiple transmitting relays. We develop an analysis of queued cooperative relay systems that combines...
A circular patch antenna with a narrow slit is proposed to achieve multi frequency, dual band operation. The proposed antenna radiates at four different frequencies with sufficiently high matching with probe feed system. Among these four frequencies two frequencies 2.62 GHz and 5.82 GHz lies in lower and upper frequency band respectively of Wi-Max application created by IEEE 802.16 working group....
This communication presents a comparison in the performance of a normal elliptical microstrip patch antenna with same antenna having loading of sector slits. Required number and dimensions of the slits for bandwidth enhancement are optimized for reliable radiating characteristics. It is found that resonant frequency of the unslotted elliptically patch antenna is about 5.62 GHz, with an operating bandwidth...
A modified rectangular patch antenna with an air gap in between the two substrate layers of patch antenna is analyzed using the IE3D simulation software to achieve compact size, lightweight and wide band operation. With variation in patch geometry and insertion of thin air gap, the bandwidth of traditional microstrip antenna which varies between 1 - 2 % is improved to more than 33.5%. Different radiation...
SoCs today rely heavily on behavioral models of analog circuits for Top Level Verification. The minimum modeling requirement is to model the functional behavior of the circuit. A lot of ongoing work is also focused on modeling analog circuits to predict the system performance of the SoC. This paper presents a methodology to enhance the quality of SoC verification by using a bottom up approach to verify...
Behavioral modeling of analog circuits is widely advocated and accepted means to speedup mixed-signal SoC level simulations. The validity of these simulation results is contingent on the quality of behavioral models used. This paper presents a verification methodology to establish equivalence of analog behavioral model and the SPICE circuit being modeled. The proposed methodology employs SPICE-on-top...
We consider the problem of several users transmitting packets to a base station, and study an optimal scheduling formulation involving three communication layers, namely, the medium access control, link, and physical layers. We assume Markov models for the packet arrival processes and the channel gain processes. Perfect channel state information is assumed to be available at the transmitter and the...
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