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A new time-reversal imaging method based on the time focusing is presented. The time focusing behavior of the retransmitted time-reversal back-propagating waves from the time-reversal mirror (TRM) at a single target position is extended to multi target positions by using a grouping technique that divides the receiving array as a group of sub-arrays. The number of targets can exceed that of either...
A new type of address code-Optical Orthogonal Code Pairs (OOCP) for Optical Code Division Multiple Access (OCDMA) system is presented in this paper according to the theory of sequence pair. Simultaneously, the concept of OOCP and correlation are defined, and OOCPs of capacity 1 are obtained by using exhaustive algorithm. Finally, OOCPs of larger capacity can be obtained by the recursive construction...
A new perfect discrete signal-mutual orthogonal binary complementary array pair set is presented under aperiodic correlation condition. Several construction methods of mutual orthogonal binary complementary array pair set are proposed. Based on these methods, a great many new mutual orthogonal binary complementary array pair sets can be generated. This kind of array signals extend the existence scope...
The coagulation and fibrinolytic systems are complex, inter-connected biological systems with major physiological roles. The complex, nonlinear multi-point relationships between the molecular and cellular constituents of two systems render a comprehensive and simultaneous study of the system at the microscopic and macroscopic level a significant challenge. We have created an Agent Based Modeling and...
Many applications meet certain programming patterns like pipeline, fork-join, do-all etc. While tools such as OS threads and OpenMP allow programmers only to express task or data parallelism, special support for programming patterns is distinctly lacking. Intel threading building blocks (TBB) is developed to address this problem, but its scheduler is general and not optimized for any of its parallel...
In order to reduce the design burden of the wideband beamforming systems, a method of time-domain nearfield wideband beamforming is proposed in this paper. The proposed method which combines the nearfield compensation method together with fractional delay filters first performs nearfield compensation to the received signals using FIR fractional delay filters, before a time-domain farfield wideband...
Phased array ladar is a new type of ladar that using an optical phased array (OPA) as beam steering device. In the application of the ladar, the development of liquid crystal optical phased array (LC-OPA) technology is introduced in this paper. Through the discussion about the response speed, deflection efficiency and steering angle, the performance of the liquid crystal optical phased array beam...
We present a USB-based, highly directional, and portable microphone array device that delivers a crisp, clear and noise-reduced speech signal. This device consists of four linearly distributed microphone sensors and a filter-and-sum beamformer designed using broadband beam-forming algorithm. The device has a narrow acoustic beam pattern and identical frequency responses for almost all speech bands...
A discrete signal with good periodic correlation property is discussed, which is pseudorandom punctured binary sequence pairs. The invariant transformation properties and combinatorial admissibility conditions of it were presented. Based on these properties some pseudorandom punctured binary sequence pairs with certain length were searched out. The research results show that it has high energy efficiency...
A new discrete array signal with good periodic correlation property is discussed, which is ZCZ array pairs. The invariant transformation properties of it were presented. Based on perfect array pair and orthogonal matrix, ZCZ array pairs set with certain volume, family size and zero correlation zone can be synthesized through row or column interleaved technique. Except the binary case, this technique...
A new construction method of ZCZ arrays set based on interleaved technique is presented. Given perfect periodic autocorrelation array and orthogonal matrix, arrays set with certain zero correlation zone can be constructed through interleaved method. The presented technique has good application foreground in many kinds of array signal design.
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