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The cognitive radio (CR) have been proposed to improve spectral efficiency and to meet growing demands for higher data rates in mobile communications and satellite communications. In this paper, we propose a blind estimation algorithm for a secondary user to estimate transmission parameters of the primary signal in an OFDM overlay system, using only the available fast Fourier transform (FFT) component...
Although the Z-domain precoding method for blind separation of spatially correlated sources is proved reliable in theory, it has disadvantages in its implementation since it requires knowledge of precoder zeros at the receiver beforehand. A new method is proposed in this article to find these precoder zeros and estimate the separation vectors of the coded signals at the same time by exploiting the...
Identifying the location of a target is a fundamental application in multistatic sonar. Numerous attempts have been made to improve the accuracy, computational efficiency and robustness of target positioning. Previous studies mostly use time delay and angle measurements for localization, or time delays and Doppler shifts if relative motions exist among the transmitters, target and receivers. This...
This paper addresses the problem of blind source enumeration in the colored and unbalanced noise environment, where the number of sources can be equal to or more than the number of observers. In the proposed algorithm, the Gerschgorin Disk Estimator (GDE) is used as the detection rule and fourth-order cumulant of the observed data is used to estimate Gerschgorins radii. Compared with the minimum description...
A moving target creates the Doppler effect on the transmitted signal, which can be exploited to improve the target localization accuracy in multistatic sonar that normally utilizes differential delay time measurements only. In this letter, we first examine the contribution of Doppler measurements via the Cr $\acute{\text{a}}$mer–Rao lower bound (CRLB) study, and then develop an algebraic closed-form...
The propagation characteristics of body channel are the fundamental issue of intra-body communication system design. The measurements of the body channel cover the frequency range from 300 kHz to 5 MHz and the channel length of 30 cm, 90 cm and 150 cm. Individual difference and movement states are introduced as measurement parameters. A data processing method is created to offset the systematic error,...
A communication system using multilayer coded modulation is introduced to detail the basic principles of hierarchical combined equalization based on linear minimum mean square error (MMSE) algorithm. A simplified hierarchical equalizer's extrinsic information of base-layer for 4-QAM multilayer coded modulation is presented. A new hierarchical equalization method of base layer is applied to multilayer...
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