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This paper explores the vision of a dual-use sensing/communication system based on Cognitive Radio Network (CRN). The motivation of the paper is to push the convergence of sensing and communication systems into a unified cognitive network. The concept design of this sensing/communication system is presented along with potential functions and challenges. A through tree target detection using real data...
In this paper, wideband waveform design for relay cognitive network will be presented. There is one transmitter, several relay nodes and one or several receivers in cognitive network. Assume there is no direct communication link between the transmitter and the receiver. We would like to jointly design the transmitted waveform and the FIR filters at the relay nodes such that the received signal to...
This paper investigates the transmitted waveform optimization issues for wideband Multiple Input Single Output (MISO) cognitive radio. For cognitive radio, a spectral mask for the transmitted waveform is determined on spectrum sensing, and arbitrary transmitted spectral shaping is required. Meanwhile, the interferences from primary radios should be canceled at the receiver of cognitive radio. The...
This paper discusses the theory behind ultrawideband (UWB) transmit waveform design, and reports a proof-of-concept UWB radio testbed with waveform level precoding. Unlike a narrow-band channel, a UWB channel contains a large number of resolved multipath components, which opens a door for exploring new features offered by UWB. Waveform level optimization is meaningful, but it is a great challenge...
In this paper, a testbed design and implementation of ultra-wideband (UWB) multiple-input single-output (MISO) time-reversal system are presented. The implementation is based on field programmable gate array (FPGA). The combination of MISO with UWB time-reversal is promising for enhancing the data rate and reliability in harsh wireless environments. When multiple transmitter antennas are considered...
This paper investigates the transmitted waveform optimization issues for wideband cognitive radio with energy detector receiver. The motivation is to provide a cheap cognitive radio network with simple and cheap cognitive radio receivers. In cognitive radio, a spectral mask for the transmitted waveform is determined upon spectrum sensing, and arbitrary transmitted spectral shaping is required. Meanwhile,...
Sampling is the bottleneck for ultra-wideband (UWB) communication. Our major contribution is to exploit the channel itself as part of compressed sensing, through waveform-based pre-coding at the transmitter. We also have demonstrated a UWB system baseband bandwidth (5 GHz) that would, if with the conventional sampling technology, take decades for the industry to reach. The concept has been demonstrated,...
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