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In this paper, we propose and analyze a multi-level acknowledgement scheme for hybrid ARQ (H-ARQ) systems, which modifies a general ACK/NAK signals to represent multilevel information. For instance, the other signals except the ACK/NAK signals may be used for scheduling of retransmission in H-ARQ scheme, which results in increasing the resolution of uplink channel estimation signals. Simulation results...
A novel beam-forming detector for group space-time coded systems is proposed in this paper, which utilizes unitary preprocessing in the transmitter to simplify the decoding complexity in the receiver. Eigenmode selection is introduced to achieve more system diversity gain. Furthermore, a simple example for variable-rate group space-time coded systems is presented. Simulation results show that the...
OFDM/CPM is now a recognized alternative to conventional OFDM for the transmission of signals over nonlinear channel. This paper presents a characterization of nonlinear distortion effects in orthogonal frequency-division multiplexing/continuous phase modulation (OFDM/CPM) transmission systems. In a second step, a comparison with simulation results is carried out to show that CM is more suitable to...
In this paper, we first analyze the amount of fading (AF) of orthogonal space-time block codes (STBCs) over spatially uncorrelated keyhole channels. In order to investigate the diversity order of keyhole channels, we then derive an approximate expression for the average bit error rate (BER) at high signal-to-noise ratio (SNR). Finally we present the average capacity expression by applying the Gauss-Laguerre...
Novel antenna composed of Koch fractal microstrip patch with H-shaped aperture for the UHF-RFID reader is proposed. The fractal and reflective techniques are introduced to reduce the size of the antenna and enhance the gain of the antenna. The proposed antenna has impedance bandwidth from 900 MHz to 937 MHz for the reflection coefficient to be below - 10dB (VSWR<2). The gain of the antenna at 915...
A 36 MHz intermediate frequency amplifier (IFAMP) is designed using Chartered 0.35 um CMOS technology. The nonlinear characteristic of IFAMP is analyzed, and the technology of leading compensation and miller capacitance compensation is adopted. The circuit simulation tool is ELDORF which provided by Mentor Graphics. Simulation results show that IFAMP has greater than 28 dB gain, low noise figure (about...
This paper discussed the meaning, transactions scale, character and development trend of the third party online payment. We analyse the sources of deposition funds and measure its scale. Based on the analysis of the scale, we analyse the possible investment channels of the deposition funds and its income trend. Considered with the status of income distribution, we point out advice of the deposition...
Optimal design of auction is one of hot research topics in the auction theory. During recent years, shill bidding has increased substantially with the explosion in the number of online auctions. This paper designs the optimal online auction with shill bidding and open reserve price. Many optimal auction models have assumed that the number of potential bidders is constant and known. And in these optimal...
In this paper, we present numerical results to show the performance of power control (PC) by using antenna arrays at the base station (BS). We show that the diversity generated by antenna array, decreases the outage probability, the bit error rate (BER), the fluctuations of the received signal to interference ratio (SIR) over the target SIR, the transmitted power level, and finally increases the speed...
A theoretical model for describing multiple access interference (MAI) in unslotted CDMA packet networks is presented, and a novel recursive method for throughput analysis of unslotted CDMA packet networks is proposed. Moreover, the impact of spreading gain on throughput performance is discussed. Furthermore, the throughput bounds of unslotted CDMA packet networks are considered by the extension of...
This paper analyzes zero-forcing (ZF) code-aided narrow-band interference (NBI) rejection in synchronous direct-sequence code-division multiple access (DS-CDMA) systems of complex channel circumstance. The performance of decoding is badly affected based on general ZF code-aided techniques because of the phase of complex gain accounting for channel effects. The system based on modified ZF code-aided...
Based on traditional Gilbert Cell prototype, a low voltage and low power down-conversion mixer which conclude class AB transconductor is demonstrated in this paper. The RF, LO and IF port frequencies are 2.4 GHz, 2.2 GHz and 200 MHz, respectively. With SMIC 0.13 um process, simulation results show -4.8 dBm of P-1dB compression point and 6 dBm of IIP3 with -10 dBm LO power and IV supply voltage.
In order to tackle the shortage of existing research on coalition formation, where one agent only can take part in a coalition, this paper introduces overlapping coalition, and presents a novel way to settle the problem of overlapping coalition formation with Subagent. Then a particle swarm algorithm with dynamic weight value based on the similarity calculation is applied to solve overlapping coalition...
A new method for consistency adjustment of fuzzy preference relations matrix in computer-mediated Decision Making Groups was advanced. This method is based on the definition of satisfaction consistency which comes out of two axioms (connexity and transitivity) advanced by Arrow. A new target matrix R was presented, as a result of iteration, the mediation matrix was provided with the satisfaction consistency...
Aiming at the problem existing in the current knowledge organization, a model of knowledge organization based on modular ontology is put forward. The model can provide an approach to knowledge organization autonomously and collaboratively, based on which advanced knowledge organization is discussed. To some extent, the model can improve the ability of knowledge reuse and knowledge integration, and...
To overcome the drawbacks that individual preference information for uncertainties is rarely considered in current complex alternative ranking methods usually resulting in unreasonable alternative rankings, an approach to rank complex alternatives based on behaviors is presented by means of prospect theory. The presented approach introduces a new analysis structure to decompose a complex problem into...
In the process of order fulfillment in build-to-order supply chain (BOSC), one of the most important problems in the corporations is how to improve the cost-effectiveness of BOSC while increase of customer satisfaction is achieved. Meanwhile, the explosion of e-business, especially the Internet-enabled supply chain mode, makes it more cost-effective for manufacturer and customers to interact with...
A new lower complexity ultra-wide-band 1-10-GHz low-noise amplifier is presented in this paper. This LNA only consists of two simple amplifiers with an inter-stage inductor connected. The first stage is a common-gate amplifier that is used to attain the wideband input matching and low noise. A common-source amplifier with shunt-peaked load as the second stage achieves high gain and wideband output...
Many contention protocols in wireless networks such as carrier sense multiple access with collision avoidance (CSMA/CA) incorporate methods that minimize probability of collision. However there is another possible way that collisions can be avoided, that is by getting some help from physical layer technologies. It has been proved that multiple-input-multiple-output (MIMO) technology with spatial multiplexing...
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