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One of the main potentials for improved bulk reading speed in UHF radio frequency identification (RFID) systems is collision recovery, i.e., the recovery of signal collisions on the channel caused by unwanted simultaneous replies of the RFID tags. State-of-the-art collision recovery methods typically rely on quasi perfect channel state information (CSI), which is difficult to achieve using existing...
This paper presents wireless sensor network unmanned aerial vehicle (WSN-UAV) system for military remote monitoring and surveillance. Large scale WSN is deployed in a battlefield or wide hostile region to collect information of interest and send it to a UAV. Collaborative beamforming (CB) is used to achieve the ground-to-air transmissions. An automatic dependent surveillance-broadcast (ADS-B) based...
A robust digital modulation scheme, called differential on-on keying (DOOK), is presented in this paper which outperforms the conventional on-off keying (OOK). In this scheme, a sinusoidal signal is transmitted during the first half of the bit duration while a replica or an inverted version of the sinusoidal signal is transmitted during the second half for logic one or logic zero, respectively. Non-coherent...
In this paper, a Software Defined Radio (SDR) receiver structure suitable for readers using passive Radio Frequency IDentification (RFID) is presented. In such a passive RFID configuration, the undesirable DC-offset phenomenon may appear in the baseband of the reader receiver. This phenomenon can severely degrade the performance of the extraction of valid information from a received signal in the...
Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM), MIMO-OFDM, is considered as a spectrally efficient approach to achieve high throughput communications. This paper investigates the performance of MIMO-OFDM system using the proposed NLMS adaptive equalizer and the developed Singular Value Decomposition (SVD) technique in estimating the channel. The performances...
In this paper we investigate the effectiveness of iterative (turbo) synchronization at improving the link reliability of digital video broadcasting return channel via satellite (DVB-RCS) for different modulation schemes in the presence of strong phase noise. We also propose a multi-user scheme that enables two remote terminals, each using QPSK, to simultaneously use the same frequency band. All additional...
The emerging network technologies have brought an upheaval in wireless communication. Fourth generation (4G) networks are designed for better performance by utilizing high band width and better quality of service. IEEE 802.22 is one of the 4G technologies that is in draft stage and yet not deployed. Along with its spectrum sensing and spectrum accessing issues, security concerns are also getting attention...
Cognitive radio based IEEE 802.22 deploys the concept of maximum resource utilization through dynamic resource sharing. Inter base station resource sharing is dynamic process in IEEE 802.22 and is accomplished by exchange of control messages between the neighboring base stations. Insecure transmission of control channels open vulnerable holes for the denial of service attacks on base station. First...
A highly linear, closed loop CMOS architecture is demonstrated for the mixing of RF waveforms to baseband as sampled-data signals. In converting a 915 MHz RF waveform to a 20 MHz spread spectrum baseband signal, the measured third-order intercept lies at +27 dBm of input power. As the 1-??m CMOS prototype dissipates only 12 mW from a 5V supply, and is capable of operation at 3V, it is expected to...
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