Interference Alignment (IA) with Alamouti coding is an innovative method to increase the multiplexing gain and the diversity gain, simultaneously, in wireless Multiple-Input Multiple-Output (MIMO) systems. The main limitation of this method is requiring Perfect Channel State Information (CSI) to perform the beamforming on transmitters and receivers signals. Contrary to the acceptable performance of Alamouti coding in perfect CSI conditions, its efficiency is severely reduced in imperfect CSI conditions. In order to overcome this shortcoming, this paper discusses about the effect of imperfect CSI on a two user MIMO X-channel which uses interference alignment together with Alamouti coding. Also, a closed form solution is extracted for the received signal in an imperfect CSI scenario. Our analysis shows that when the variance of the CSI error is increased, the Bit Error Rate (BER) of system increases linearly. Also, we propose a joint Power Allocation (PA) and Constellation Rotation algorithm to improve the performance of system in an imperfect CSI scenario. Computer simulations show a desirable improvement in BER by using PA, Constellation Rotation and joint of them.

Context: Suicide attempt is a common high-risk behavior, and early detection is crucial for prevention and treatment. There is limited research on suicide indices in the Rorschach test. Therefore, the purpose of this review was to assess studies related to suicide indicators in the Rorschach test to determine whether the use of this test can indicate the risk of suicide among people or not. Evidence Acquisition: All databases, including PubMed, Science Direct, and Scopus, were used based on “, Suicide”, AND“, Rorschach”,keywords from 1960 to the end of 2021. Screening and selection of articles and their quality evaluation were carried out by two reviewers independently. Of the 554 articles in the initial search, 21 passed the evaluation stage. Results: Given that 21 articles were included in this research, color-shading responses are considered the most critical suicide indices using the single-sign approach. Hertz’, s multiple-signs approach and Exner’, s suicide Constellation are among the most commonly used indices for suicide risk assessment. A total S-CON score of 8 or higher in the Rorschach test is a powerful predictor of suicide risk. Conclusions: Preventing suicide is a horrific but crucial responsibility. Early identification of suicidal thoughts can save the lives of many. Projective tests such as Rorschach can be used with clinical interviews to detect thoughts and suicide attempts.

In this paper, we consider a scheduling problem for a set of agile Earth observation satellites for scanning different parts of the Earth’s surface. We assume that preemption is allowed to prevent repetitive images and develop four different preemption policies. Scheduling is done for the imaging time window and transmission time domain to the Earth stations as well. The value of each picture from different target regions and the limitations of the satellite Constellation in terms of memory and energy cause high computational complexity for this problem and thus obtaining an optimum solution with a deterministic method is very time-consuming. Consequently, a genetic-based metaheuristic algorithm with a specific solution representation is developed in order to maximize the total value of the observation process by establishing heuristic rules in the initial population of this algorithm. Comparison of the results from the proposed model with the results of cases where repetition of observed areas is not ignored indicates that the proposed model can bring about a significant increase in profits in the planning horizon.

This research is going to present design of a LEO Constellation for Navigation service with minimum number of Satellites. The goal is to achieve Dilution Of Precision (DOP) less than 6. This Requirement is going to be achieved using predefined launch vehicles limitation on orbit which is 500 km in circular orbit altitude and 55 degrees for orbit inclination. Design has been done based on Analyses resulting in Optimization for least number of Satellites in this orbit, to satisfy all requirements for Navigation Performance and in conformance with the constraints related to launch and orbit. Multiple analyses have been done resulted in Constellation with 324 satellites, formed in 18 Orbits with 18 Satellites in each. This design shows the performance of 4. 7 in DOP for a User located in Tehran, however, the distribution of DOP over the target area shows that the requirement has been passed through the whole region.