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This paper proposes an improved cognitive radio system based on Wireless Statistic Division Multiplexing (WSDM) which is the modified version of the new-style cognitive radio system proposed by Li. The maximal user number is limited by the antenna number at receiver in Li's system. In this paper, we relax this limitation in multiplexing subsystem and propose a modified minimum description length (MDL)...
The key indicators of analog to digital converter (ADC) are effective number of bits (ENOB) and spurious-free dynamic range (SFDR). ENOB would affect the input signal to noise ratio (SNR), and SFDR indicates the degree of spurious introduced by non-linear. The characteristics of multi ADC in antenna array would not be the same, which make the quantization noise introduced by ENOB and spurious indicated...
The growing demand of the wireless communications introduced the challenge of the efficient use of the spectrum. Cognitive radio is an emerging technology in the field of wireless access, in order to considerably improve the use of the radio spectrum by allowing access of opportunistic manner. The detection of the spectrum is the basic functionality in a cognitive radio that is why in this paper a...
The Physical Layer Security (PLS) technology has been proved to be an effective way to reduce information leakage in wireless communication networks. This paper discusses the problem of secure transmission for Amplify-and-Forward (AF) cooperative network which contains both an external eavesdropper and some untrusted relays at the same time, where each relay acts as a helper of transmitting information...
This paper firstly introduces the definition and types of wavelet transform. Then we introduce the Mallat decomposition and reconstruction algorithm in detail. Secondly, after comparing the advantages and disadvantages of several Better Method, we choose wavelet thresholding and make improvements of that. At last, we compare the SNR of the signal de-noising by matlab simulation analysis to prove the...
In order to improve anti-jamming performance of GNSS receivers, the Automatic Gain Control (AGC) system is commonly utilized. AGC is able to scale the analog input voltage to an optimal level of the ADC. Few studies have investigated how AGC impacts the signal processing of GNSS receivers in pulsed interference conditions. This paper studies the performance of GNSS receivers with AGC in the presence...
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