Coding Theory and its Applications in Communication systems

Error control coding has been used extensively in digital communication systems because of its cost-effectiveness in achieving efficient, reliable digital transmission. Coding now plays an important role in the design of modern communication systems. This paper reviews the development of basic coding theory and state-of-art coding techniques. The applications of coding to communication systems and future trends are also discussed

Iterative multiuser detection with integrated channel estimation for turbo coded DS-CDMA.

In present days the demand of high bandwidth and data rate in wireless communications is increasing rapidly to accommodate multimedia applications, including services such as wireless video and high-speed Internet access. In this thesis, we propose a receiver algorithm for mobile communications systems which apply CDMA (Code division multiple access) as multiple access technique. Multiuser Detection and turbo coding are the two most powerful techniques for enhancing the performance of future wireless services. The standardization of direct sequence CDMA (DS-CDMA) systems in the third generation of mobile communication system has raised the interest in exploiting the capabilities and capacity of this type of Technology. However the conventional DS-CDMA system has the major drawback of multiple Access Interference (MAI). The MAI is unavoidable because receivers deal with the information which is transmitted not by a single information source but by several uncoordinated and geographically separated sources. To overcome this problem MUD is a promising approach to increase capacity. (Abstract shortened by UMI.)Dept. of Electrical and Computer Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2005 .C465. Source: Masters Abstracts International, Volume: 45-01, page: 0404. Thesis (M.Sc.)--University of Windsor (Canada), 2005

Design and Implementation of Convolutional Encoder and Viterbi Decoder Using FPGA.

الحفاظ على دقة البيانات هو الشيء الأكثر أهمية في مجال الاتصالات. هناك العديد من العوامل التي تؤثر على دقة البيانات عندما يتم نقلها عبر قناة الاتصال مثل الضوضاء الخلل تغلب على هذه الاثار يتم تشفير قنوات الترميز. في هذه الورقة يتم استخدام نوع واحد من قناة الترميز هي رموز التلافيف على وجه التحديد. ترميز الالتواء هو أسلوب خطأ إلى الأمام تصحيح (FEC) المستخدمة في وصلات الاتصالات في الوقت الحقيقي المتواصلة في اتجاه واحد التي يمكن أن تقدم تطورا كبيرا في معدلات الخطأ بت وهكذا تكون صغيرة ومنخفضة الطاقة وأجهزة الإرسال الرخيصة عند استخدامها في تطبيقات مثل الأقمار الصناعية. في هذه الورقة تسليط الضوء على تصميم ومحاكاة وتنفيذ التشفير التلافيف وفك فيتربي باستخدام MATLAB- برنامج (2011). يستخدمSIMULINK HDLالمبرمج لتحويل نماذج MATLAB- SIMULINK إلى رمز VHDL باستخدام لوحات ألتيرا إعصار الثانيDE2-70. تظهر المحاكاة وتقييم تنفيذ نتائج تزامن مع نتائج تصميم.Keeping  the  fineness of data is the most significant thing in communication.There are many factors that affect the accuracy of the data when it is transmitted over the communication channel such as noise etc. to overcome these effects are encoding channels encryption.In this paper is used for one type of channel coding is convolutional codes. Convolution encoding is a Forward Error Correction (FEC) method used in incessant one-way and real time communication links .It can offer a great development in the error bit rates so that small, low energy, and devices cheap transmission when used in applications such as satellites. In this paper highlight the design, simulation and implementation of convolution encoder and Viterbi decoder by using MATLAB- program (2011). SIMULINK HDL coder is used to convert MATLAB-SIMULINK models to VHDL using plates Altera Cyclone II code DE2-70. Simulation and evaluation of the implementation of the results coincided with the results of the design show the coinciding with the designed results

Convolutional Coding Using Booth Algorithm For Application in Wireless Communication

Convolutional codes are preferred types of error control codes which can achieve low BERs at signal to noise ratio (SNR) very close to Shannon limit. Here, a new method of convolutional encoding is proposed using the general Booth algorithm for multiplication. This algorithm follows a fast multiplication process and achieves a significantly less computational complexity over its conventional counterparts. It can be a useful technique for use in chip design as it provides significant improvements. In this work, the performance of conventional convolutional coding with Viterbi decoding in AWGN channel, is studied and the results show the effectiveness of the work described here

Integrated source and channel encoded digital communication system design study

Various aspects of space shuttle communication systems were studied. The following major areas were investigated: burst error correction for shuttle command channels; performance optimization and design considerations for Costas receivers with and without bandpass limiting; experimental techniques for measuring low level spectral components of microwave signals; and potential modulation and coding techniques for the Ku-band return link. Results are presented