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The use of convolutional product codes in cooperative communication systems
(2014) Hadi, Ali
In this thesis work, the performances of cooperative communication systems employing convolutional product codes (CPCs) and serially concatenated convolution codes (SCCCs) are inspected in detail and compared to each other. Different combining methods at destination are proposed. One of these methods is based on the combination of bit probabilities on the other hand other method focuses combining the signals considering their signal to noise rations (SNRs). The effect of relay number on the system performance is inspected. Reduced complexity cooperative communication systems utilizing convolutional product codes are considered. The proposed systems are all iteratively parallel decodable and have low latency
Joint source channel coding using trellis coded quantization
(2015) Al-Sammarrie, Samir H. Salih
Trellis coded quantization is inspired from trellis coded modulation for better bit efficient quantizer design. In this thesis study we proposed joint communication systems, involving trellis coded quantization, space time block codes, and recursive systematic convolutional codes. The proposed joint communicatios structures are novel and they are iteratively processable. Using the RSC(1,5/7)octal state transition diagram we proposed a new trellis coded quantization approach and integrated the proposed structure with space time block codes and the performance of the joint system is obtained via computer simulation. From simulation results it is seen that the proposed system shows better performance that the classical TCQ integrated with space time block codes and in addition the proposed system has lower distortion when compared to its classical counterparts.
Joint structures involving pdsccs, tcm and space time codes
(2015) Saeed Al-Kattan, Ahmed Ameer
In this thesis we propose new concatenated joint communication structures involving convolutional product codes, space time codes and trellis coded modulation. The first structure consists of convolutional product codes and space time codes. The second one includes convolutional product codes and trellis coded modulation. The proposed structures are all parallel decodable due to the structure of convolutional product codes and have low decoding latencies, which are the main advantages of these proposed structures considering their classical counterparts constructed using serially concatenated convolutional codes, space time codes and trellis coded modulation. The use of multi-antennas at the proposed structures increases the spectral efficiency.
Performance of space time block coded bit interleaved coded modulation systems for mobile communication channels
(2014) Ismaeil, Omar Khaza’al
In this thesis concatenated systems involving bit interleaved coded modulation (BICM) and space time codes (STC) are inspected in detail. Space time block codes (STBCs) are used while forming the joint structures. Performance of the joint structures involving BICM and STCs for additive white Gaussian and mobile fading channels are measured via computer simulations. Iterative decoding logic is applied for the decoding of these joint structures. An alternative feedback path for the iterative decoding of BICM-STBC joint structures is proposed and simulation results showed that the proposed path result in better bit error rate performance. Concatenated BICM-STBCs are also used in cooperative communication structures. A signal combination method based on the linear combination of the signal probabilities coming from the relays is proposed and it is seen that proper choosing of the coefficients for the linear combination of the probabilities is an important criteria for the performance of the cooperated systems.
Iterative decoding of block codes
(2010) Genç, Fatih
Error control coding is vital for digital communication. With the advent of turbo codes a huge interest on iterative decoding aroused recently. Although iterative decoding reduces bit error rate (BER) significantly, it brings new challenges such as increased complexity and large decoding delays. Turbo like codes can be constructed either using convolutional codes or block codes. In this thesis we construct classical turbo codes with both convolutional codes and block Bose Chaudhuri and Hocquenghem (BCH) codes, and simulate their performances and discuss their advantages and disadvantages.

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