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In this paper, a simple downlink transmit scheme joint beamforming (BF) with space-time block coding (STBC) is proposed for cooperative base stations (BS). By deriving the equivalent signal-to-noise ratio (SNR) at the receiver, we first obtain the optimal BF weight vectors and the allocated power coefficients in terms of maximizing the statistical mutual(More)
To improve the scientific and efficiency of anti-jamming communication system, this paper design an in anti-jamming communication decision engine based on Particle Swarm Optimization for multiple parameters selecting adaptively. The procedure of the proposed method is presented. Simulation is made in six models, the results show that the decision engine can(More)
A novel fuzzy jamming recognition approach based on complexity measure of received signal is proposed. The proposed algorithm exploits the LZ complexity and box dimension of received signal as classified characters of jamming pattern. After the mean center and variance of each jamming pattern are calculated by some jamming samples, exponential fuzzy(More)
This paper proposes a low-complexity anti-jamming capability evaluation method of wireless communication systems, termed communication effectiveness of anti-jamming (CEAJ). CEAJ is considered in two aspects: effectiveness in dodging and suppressing jamming. The effects of several anti-jamming technologies are considered in each aspect. Numerical examples of(More)
Magnetic Resonance Electrical Impedance Tomography (MREIT) is a new medical imaging technique. The basic idea of MREIT is to reconstruct the medium conductivity using the internal magnetic flux information, based on the Maxwell equations. This paper considers the numerical realization of the well-developed harmonic magnetic flux algorithm for the noisy(More)
HAPS has become a hot research issue due to low free space loss, low system investment and high flexible local coverage in recent years. The various frequency bands have been assigned for HAPS applications by International Telecommunication Union (ITU). The interference between HAPS and FSS is unavoidable because of the same frequency band and the overlap(More)
Spectrum sensing algorithms based on power spectral density (PSD) are an important category in spectrum sensing approaches. In this paper, a new PSD estimation method based on compressed sensing (CS) and the Blackman-Tukey (BT) approach is proposed. First, the low-rate measurement sequence of the received signal is obtained by CS. Second, the(More)
—From cognitive radio (CR) conception, a novel joint design of frequency and power adaptation for frequency-hopping spread spectrum (FHSS) system is developed based on truncated interference inversion algorithm. In the adaptation scheme, the interfering carrier frequencies are removed from frequency hopset firstly. Then the transmitter adjusts its power to(More)
This paper proposes a method to accurately estimate sweeping spectrum range and the instantaneous frequency of the nonlinear chirp signal. Considering the lack of study in nonlinear chirp signal, we utilize SPWVD to analyze the non-linear chirp signal, then obtain the time-frequency distribution. The transferred results are utilized to estimate the sweeping(More)