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Multiple input multiple output (MIMO) and pre-coder are the effective methods to overcome the influence of the time-varying channel since it is a key factor of the communication performance. However, the existing researches of MIMO and pre-coder focus on the spectrum efficiency under the Gaussian input assumption. This drawback limits the pre-coder technology application in the green communication...
CV-QKD has drawn many attentions due to the potential to provide high secret key rate and low cost. Error reconciliation is the key module of post processing of a CV-QKD system. In this paper, an improved LDPC-based SEC error reconciliation scheme is proposed. Through the optimization of inner-level decoding and reduction of the iteration rounds of inter–level decoding, the reconciliation can be accelerated...
This letter presents a new lattice-form complex adaptive IIR notch filter to estimate and track the frequency of a complex sinusoid signal. The IIR filter is a cascade of a direct-form all-pole prefilter and an adaptive lattice-form all-zero filter. A complex domain exponentially weighted recursive least square algorithm is adopted instead of the widely used least mean square algorithm to increase...
Cognitive-radio-networks with multiple input multiple output is an effective method to improve spectrum efficiency. Linear pre-coders is a crucial technology to realize this goal. However, most of existing algorithm developed based on the Gaussian input assumption. This assumption limited the application of linear precoding and caused great performance loss. In this paper, for such a problem, a linear...
Community related applications such as instant messengers or file-sharing tools enjoy a great popularity in the Internet. But, the forming of communities is unprompted and the joining of users is based on their interesting. The opportunity to spread malicious-programs or purloin user's information is provided to malicious users. So, a clustering algorithm based on trust is presented to form a safe...
Image compression based on region of interest has been one of hot issues in the field of image compression and coding. However, there is not a fixed model for region of interest automatic detected. In order to solve the transmission question for the infrared images through the low bandwidth data link, the method of ROI automatic detected in infrared images, based on a fast recurring algorithm based...
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