The two-antenna problem in aeronautical mobile telemetry is created by the reception of two copies same RF waveform with different phases and time delays. Alamouti Alamouti-like space block codes can solve problem, but decoder/detector needs to account for delays between signals received from transmit antennas. This paper compares performance space-time time-reversed 16-APSK problem. maximum li...

In order to compare the performances of three transmission schemes of keyinterest able to reach the maximum diversity order, guarantee of robust transmission, we used a dual-polarization channel model to take into account polarization diversity and transmit/receive correlation. These schemes under study were i)two systems using full channel state information (CSI) at the transmitter side (Tx-CS...

Multiple-Input Multiple-Output (MIMO) systems as a means to combat fading in wireless channels. MIMO allows higher throughput, diversity gain and interference reduction. In this paper, we analyze the Bit Error Rate (BER) performance of the Alamouti Space Time Block Code with V-BLAST (Vertical Bell Laboratories Layered Space-Time) over MIMO system. Basic idea in this scheme is to improve the BER...

Multiple-Input-Multiple-Output (MIMO) systems are under intense investigation for wireless transmission systems. Space-Time Coding is an efficient approach to exploit the huge diversity offered by the MIMO channel. One of the main problems of Space-Time Block Coding (STBC) is that the offered diversity can only be exploited by the optimal ML receiver which has exponential complexity. In contras...

Alamouti space-time block code (STBC) combined with a simple heterodyne coherent receiver enables phase diverse coherent detection without any optical polarization tracking. While such a system consisting of only a 3-dB coupler and a single balanced photodiode has been recently demonstrated using orthogonal frequency-division multiplexed (OFDM) signals, herein we report the first application to...

Recently, a lattice reduction-aided (LRA) multiple-input multiple-output detection scheme has been proposed in junction with linear (as well as nonlinear) detectors. It is well known that these schemes provide a full diversity, and its complexity is comparable to that of linear detectors for the block fading channels. For the fast varying channels, however, the decoding complexity of LRA detect...

The systems under investigation are broadband fixed wireless access (BFWA) systems operating in multipath fading channels. Conventional detection methods, e.g., coherent detection for single-input, single-output (SISO) systems and the Alamouti algorithm for multiple-input, multiple-output (MIMO) systems are examined theoretically in this paper and shown to yield unsatisfactory performance. The ...

This paper proposes and analyses an efficient wireless telecommunication system with multiple antennas to the emission and reception MIMO (multiple input multiple output) with space diversity in an OFDM (Orthogonal Frequency Di vision Multiplex). The proposed system consists to add modified Alamouti encoder to the system OFDM to improve the performance of the destination by intimately collabora...

Dept. of Electrical Engineering College of Engineering Imam Muhammad Ibn Saud Islamic University Riyadh, Saudi Arabia Email: [email protected] Abstract Space-time coding can achieve transmit diversity and power gain over spatially uncoded systems without sacrificing the bandwidth. There are various approaches in coding structures, including space-time block codes. A class of space-time block ...