Investigation of multi level space time coding for wireless communication

مقدم أطروحة جامعية

al-Sani, Nadiyah Muhammad Nasir

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة الاتصالات

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2008

الملخص الإنجليزي

Space-time coding (STC) deals with the design of good codes for multiple antenna wireless systems.

In this thesis an orthogonal code is proposed in order to design the reduced states multilevel space time coding (RSMSTC) as an improved design of delay diversity scheme for simplifying the decoding process.

The proposed code is based on sending the signals at different rates to reduce multipath problems imposed by the fading channel.

The coded signals are transmitted from multiple antennas at the same time over the frequency selective and the flat fading channels* Three systems to encode and decode the proposed code are proposed and designed in this ihesis.

The first system sends the proposed codc directly.

The second system converts the proposed code to other form synchronous with the data at the receiver.

Finally the third system used mapping method Lo convert the proposed code to pulse position modulation (PPM), pulse width modulation (PWM), and Walsh code.

The coded signals are transmitted over a time-varying or time invariant rapidly varying fading channel and quasi-static fading channel.

The proposed three systems are designed, simulated and tested using MATLAB version 1.

The perfonnance results are compared with diagonal block space time code.

Coding gains are 9dB, 6,5dB and S.5 dB for 3 lx-2Rx of the first system* 2Tx-2Rx of the second and the third sysiems respectively at 10"4 BER over rapidly varying fading channel.

For quasi-static fading channel coding gains arc SdB and 9dB for 2Tx-2Rx of the second and ihe third systems respectively.

The detection for three systems is non coherent STC except for the first system; the detection is coherent STC over quasistatic fading channel.

Extra comparisons and tests are made in this work with different conditions

التخصصات الرئيسية

هندسة الاتصالات

الموضوعات

• الكتابة
• التشفير
• الرمزية
• البيانات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305162