Space-Time Equalisation Assisted Minimum Bit-Error Ratio Multiuser Detection for SDMA Systems

This contribution investigates a space-time equalisation assisted multiuser detection scheme designed for multiple receiver antenna aided space division multiple access (SDMA) systems. A novel minimum bit error ratio (MBER) design is invoked for the multiuser detector (MUD), which is shown to be capable of improving the attainable performance and enhancing system capacity in comparison to that of the standard minimum mean square error (MMSE) design. The adaptive MUD coefficient adjustment procedure of the MBER space-time MUD is implemented using a stochastic gradient based least bit error rate (LBER) algorithm, which consistently outperforms the classic least mean square (LMS) algorithm, while maintaining a lower computational complexity than the latter

Adaptive MBER space-time DFE assisted multiuser detection for SDMA systems

In this contribution we propose a space-time decision feedback equalization (ST-DFE) assisted multiuser detection (MUD) scheme for multiple antenna aided space division multiple access systems. A minimum bit error rate (MBER) design is invoked for the MUD, which is shown to be capable of improving the achievable bit error rate performance over that of the minimum mean square error (MMSE) design. An adaptive MBER ST-DFE-MUD is proposed using the least bit error rate algorithm, which is demonstrated to consistently outperform the least mean square (LMS) algorithm, while achieving a lower computational complexity than the LMS algorithm for the binary signalling scheme. Simulation results demonstrate that theMBER ST-DFE-MUD is more robust to channel estimation errors as well as to error propagation imposed by decision feedback errors, compared to the MMSE ST-DFE-MUD

A Comparative Study on the Effect of Using Four Square and DEFENDS Strategies on Students’ Writing skill at SMPN 01 Kuantan Mudik

The purpose of this research was to compare the effect of Four Square and Decide-Estimate-Figure-Express-Note-Drive-Search (DEFENDS) strategies for students’ writing skills. It was done through quasi-experimental design by comparing two strategies for two experimental groups of pretest-posttest design. It involved 46 students of SMPN 1 Kuantan Mudik that comprised of two experimental groups. Four research questions and four hypotheses were proposed to determine the significant differences between Four Square and DEFENDS strategies in improving students’ writing skills. The pretest and posttest were administered to both groups of students. To analyze the data, t-tests for independent and paired samples were used. The results showed that there was no significant difference in posttest scores between experimental group 1 (Four Square strategy) and experimental group 2 (DEFENDS strategy). The effect (contribution) of Four Square strategy on the students’ writing skills was 55%, while the DEFENDS strategy’s contribution was 72%. In conclusion, both strategies can be used in teaching writing skills at the school

Low-complexity iterative frequency domain decision feedback equalization

Single-carrier transmission with frequency domain equalization (SC-FDE) offers a viable design alternative to the classic orthogonal frequency division multiplexing technique. However, SC-FDE using a linear equalizer may suffer from serious performance deterioration for transmission over severely frequency-selective fading channels. An effective method of solving this problem is to introduce non-linear decision feedback equalization (DFE) to SC-FDE. In this contribution, a low complexity iterative decision feedback equalizer operating in the frequency domain of single-carrier systems is proposed. Based on the minimum mean square error criterion, a simplified parameter estimation method is introduced to calculate the coefficients of the feed-forward and feedback filters, which significantly reduces the implementation complexity of the equalizer. Simulation results show that the performance of the proposed simplified design is similar to the traditional iterative block DFE under various multipath fading channels but it imposes a much lower complexity than the latter

Superstatistical generalization of the work fluctuation theorem

We derive a generalized version of the work fluctuation theorem for nonequilibrium systems with spatio-temporal temperature fluctuations. For chi-square distributed inverse temperature we obtain a generalized fluctuation theorem based on q-exponentials, whereas for other temperature distributions more complicated formulae arise. Since q-exponentials have a power law decay, the decay rate in this generalized fluctuation theorem is much slower than the conventional exponential decay. This implies that work fluctuations can be of relevance for the design of micro and nano structures, since the work done on the system is relatively much larger than in the conventional fluctuation theorem.Comment: 13 pages. Contribution to the Proceedings of `Trends and Perspectives in Extensive and Nonextensive Statistical Mechanics', in honour of Constantino Tsallis' 60th birthday (to appear in Physica A

Pengaruh Dukungan Sosial dan Kepribadian Ekstraversi terhadap Minat Berwirausaha pada Mahasiswa

Entrepreneurship is important to improve as Indonesia is ranked 103 out of 132 Countries based on Global Enterpreuneur Index (GEI) data in 2016. Entrepreneurship is a major factor in boosting the national economy, so it is important to understand the characteristics that invite a person into entrepreneurship. The aim of this research is to know the influence of social support and extraversion personality to entrepreneurship interest in the student of Agribusiness University of Muhammadiyah Malang (UMM). Research design use Explanatory Survey, the subject of research 140 respondents from a total of 223 students Agribusiness. Systematic research using questionnaires from Likert scale. The technique of data analysis is multiple linear regression. The results showed that the influence of social support and extraversion personality together with entrepreneurship interest with R Square shows the contribution amount of 0.302 or 30.2%. Social support for entrepreneurship interests affecting entrepreneurship interests with R Square shows the contribution amount of 0.279 or 27.9%. Extraversion personality towards entrepreneurship interest influence entrepreneurship interest with R Square shows contribution amount of 0,083 or 8,3%

The HERA-B Ring Imaging Cherenkov Counter

The HERA-B RICH uses a radiation path length of 2.8 m in C_4F_10 gas and a large 24 square meters spherical mirror for imaging Cherenkov rings. The photon detector consists of 2240 Hamamatsu multi-anode photomultipliers with about 27000 channels. A 2:1 reducing two-lens telescope in front of each PMT increases the sensitive area at the expense of increased pixel size, resulting in a contribution to the resolution which roughly matches that of dispersion. The counter was completed in January of 1999, and its performance has been steady and reliable over the years it has been in operation. The design performance of the RICH was fully reached: the average number of detected photons in the RICH for a beta=1 particle was found to be 33 with a single hit resolution of 0.7 mrad and 1 mrad in the fine and coarse granularity regions, respectively.Comment: 29 pages, 23 figure