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In many resource allocation problems, optimal allocation strategies must be determined when only a quantized version of the relevant parameters are available, for instance, power allocation in wireless communications. The contribution of this work is threefold. First, the quantization problem is revisited and a framework which encompasses the classical problem of quantization is proposed. Instead...
For the aircraft health management, many sensors are embedded and utilized for monitoring. In order to control the weight, the wireless sensors can be employed. The traditional IEEE 802.11 and IEEE802.15.6 networks are easy to interfere with the avionics equipment. In order to make a easy ElectroMagnetic (EM) comparability, the sensors with magnetic transmission are considered in this paper. Compared...
In this work, a novel technique which allows every transmitter in an interference network to have global channel state information (CSI) is proposed. The key feature of the proposed technique is that each transmitter acquires global CSI purely through the available feedback channel (i.e., a feedback of the received signal power). In the first step of the proposed technique, each transmitter uses several...
In this paper, we propose a time-domain oversampled receiver for orthogonal frequency division multiplexing (OFDM) in underwater acoustic communication. Without changing the structure of the transmitter, significant gains are acquired by time- domain oversampling at the receiver. Using time- domain oversampling, the energy of transmitted symbols is concentrated on the first N subcarriers, while additive...
In this paper, an iterative receiver with Turbo equalization and soft demapping is proposed for high data rate communication in multipath channels. Minimum mean square error (MMSE) equalization is adopted to avoid noise enhancement. With the assumption that the distribution of estimated symbols is Gaussian distribution, log likelihood ratios (LLR) of encoded bits are obtained with soft demapping....
In this paper, a dual-decoder-based scheduling algorithm is proposed for H.264 video transmission over wireless networks. In the algorithm, the packet is scheduled by the packet quality contribution index (PQCI). The PQCI is defined and estimated not only by the quality distortion made for the current frame, but also by that made for the frames which directly or indirectly related with the current...
Wireless power transfer (WPT) based on magnetic resonant coupling is a novel technology by which non-radiative and mid-range power transfer can be realized via the near field. WPT inevitably leads to a small-scale regional network with a certain amount of transmitters, receivers and repeaters. There is a great lack of related analysis approaches because of its high-frequency and near-field features,...
We propose a novel Kerr-effect compensator in digital coherent receivers, in which optimized single split-steps are aligned in parallel in the frequency domain. Computer simulations show that our scheme can drastically elongate the transmission distance.
Deliberate clipping is a simple solution to high Peak-to-Average Power Ratio problem of OFDM signal. In Amplify-and-Forward OFDM relay networks, due to the limited resource, deliberate clipping is also suggested. However, clipping is a nonlinear process and may cause significant performance degradation. Based on Bussgang Linearization Theory, we provide a linear system model for Amplify-and-Forward...
To improve the system capacity of conventional orthogonal frequency division multiplexing (OFDM) systems, the layered modulation OFDM scheme is proposed. The modulated OFDM symbols are separated into two layers as differential modulated symbols and coherent symbols. The differential symbols are used as pilots, which are combined with the coherent modulated data and sent out by the transmitter. At...
In this paper, the principle of wireless power transmission technology based on resonant coupling is discussed. A simplified equivalent circuit modeling for wireless power transmission system is established. A resonator constituted by single-layer helical coils is designed and investigated. Based on experiments, the output load voltage correlated with different distance, driving frequency and disalignment...
Maximum-likelihood-sequence estimation (MLSE) is successfully introduced into the digital coherent receiver together with FIR filters. We can compensate for both linear and nonlinear impairments of 20-Gbit/s QPSK signals transmitted through a 200-km-long standard single-mode-fiber.
We demonstrate transmission of a 100-Gbit/s 32-QAM dual-polarization signal over a 200-km dispersion-managed fiber link using a digital coherent receiver. The receiver sensitivity of −20 dBm at BER = 10−3 is obtained after 200-km transmission.
A 1.28-Tbit/s signal on a single carrier is generated by the combination of 16 time-division multiplexing, 16-QAM, and polarization multiplexing. Such a signal is demodulated with a digital coherent receiver having the time-division demultiplexing function.
We demodulate a 480-Gbit/s 8PSK signal with a digital coherent receiver having time-division demultiplexing function. The receiver sensitivity is -20 dBm at BER of 10-5.
We demonstrate 100-km transmission of a 40-Gbit/s 16-QAM signal using a digital coherent receiver. The receiver sensitivity of -30 dBm is obtained at BER=10-5.
We demonstrate unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals. In spite of the launched power limitation due to SPM, the acceptable BER performance is obtained owing to high sensitivity of a digital coherent optical receiver.
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