موثوقية نقل بيانات بمعدل عالي باستخدام متعدد المداخل والمخارج لقناة متعددة المسارات == Reliability Of High Data Rate Using MIMO For Multipath Channel
Author name:
ايمان احمد فرحان
Supervisor name:
رعد حمدان ظاهر | محمود فرحان مصلح
General topic:
Electrical, Electronic and Communications Engineering
Specific topic:
Electrical and Electronic Engineering
Degree:
Master
University:
Mustansiriyah University - College Of Engineering - Department Of Electrical Engineering
Language:
English
University location:
Baghdad
First pages:
34T520 - p.pdf
Abstract:
The most important type of MIMO is the Spatial Multiplexing (SM) which is used to increase the data rate depending on the number of transmitted and received antennas. The main challenge of SM is high Bit Error Rate (BER) at low Signal to Noise Ratio (SNR), which leads to increase the power expended, and this not match the modern requirements of communication system.In this thesis, the performance of MIMO system for Space Time Block Code (STBC) and SM has been investigated. As expected the STBC increase the reliability of data rate while SM increase the data rate with significant BER. Three types of detection have been experimented with SM; Maximum Likelihood (ML), Minimum Mean Square Error (MMSE) and Zero Forcing (ZF). The results show that ML is outperform each MMSE and ZF, but as it is known the complexity of ML increase exponentially with number of antennas and modulation order. ZF is simple one, but it has poor performance.The proposed system is to add channel code serially with SM and maintain the low complexity. The experiments are begun with Convolution Code (CC) to support SM performance. The results show that significant improvement is achieved using this code with ZF detection, it can be getting more than 10 dB of SNR as code gain. But the payment is the redundancy information which can be reduced by using puncturing technique. Also the complexity of Viterbi decoder grows exponentially with large constraint length. The second code is a Low Density Parity Check (LDPC) code which is proposed with suitable parameters to reduce the required iterations in order to achieve real time application for such system. The results confirm that the proposedscheme is outperform the CC by 3 dB of SNR in addition to acceptable complexity and less number of iterations
