The combination of multiple-input multiple-output (MIMO) transmission and orthogonal frequency division multiplexing (OFDM) modulation has been shown to be an effective way substantially enhance the capacity bandlimited optical wireless communication (OWC) systems. In this paper, we propose four OFDM-based generalized MIMO (GO-MIMO) techniques for intensity-modulation direct-detection OWC syste...

A novel secure remote device access procedure and control system is presented in this paper. The user can send DTMF tones to access the control panel of the robot, which is connected to a GSM module. The DTMF tones can be sent by any cellular phone with any existing operator. The advantage of this system is the use of GSM technology for communication and any GSM mobile phone can be employed. Fu...

 Abstract— Customers can easily change their GSM operator after accepting the legal regulation on moving the number to the new operator in Turkey. In this study, fuzzy analytic network process (FANP) is used to rank for three Global Systems for Mobile Communications (GSM) operators. Five main criteria are described and also sub-criteria are determined. Because of the pairwise comparisons is li...

We present a technique for designing low-density parity-check (LDPC) code matrices for the MCS-1 to MCS-4 coding schemes of GSM. We demonstrate that these codes have significant performance gains over randomly constructed LDPC codes in the GSM setup. The new codes also show significant gains in performance over the conventional MCS-1 to MCS-4 GSM coding schemes when compared in terms of the bit...

Based on the classical optical coherence theory, ghost imaging with twisted Gaussian Schell-model (GSM) beams is analyzed. It is found that the twist phase of the GSM beam has strong influence on ghost imaging. As the absolute value of the twist factor increases, the ghost image disappears gradually, but its visibility increases. This phenomenon is caused by the fact that the twist phase enhanc...

This paper describes the GSM voice confidentiality cipher A5/1 and surveys a set of attacks against it. The attacks clearly demonstrate that A5/1 does not provide sufficient levels of security for protecting the confidentiality of GSM voice traffic.

The paper "Real time atomization of agricultural environment for social modernization of Indian agricultural system" using ARM7 and GSM' is focused on automizing the the irrigation system for social walfare of Indian agricultural system and also to provide adequate irrigation in particular area. The set up consists of ARM7TDMI core, which is a 32-bit microprocessor, GSM serves as an important p...