WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653
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Browsing WoS İndeksli Yayınlar Koleksiyonu by Author "102896"
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Article Fast decodable turbo codes(Ieee-inst Electrical Electronics Engineers inc, 2007) Gazi, Orhan; Gazi, Orhan; Yilmaz, A. Ozgar; 102896; 111575Decoding delay is an important consideration for the use of turbo codes in practical applications. We propose a new structure for turbo codes which is very suitable for parallel decoding. It is shown by union bound analysis and simulation results that the proposed system performance is comparable to that of the classical turbo codes.Article Fast decoding of polar codes using tree structure(inst Engineering Technology-iet, 2019) Andi, Alia A.; Gazi, Orhan; Gazi, Orhan; 102896In this study, the authors first propose a tree structure for the successive cancelation (SC) decoding of polar codes. The proposed structure is easy to implement in hardware and suitable for parallel processing operations. Next, using the proposed tree structure, they propose a technique for the fast decoding of polar codes. With the proposed method, it is possible to decode all the information bits simultaneously at the same time, i.e. in parallel. Lastly, they introduce an improved version of the proposed high-speed decoding algorithm. The proposed high-speed decoding approach and its improved version are simulated on the computer environment and their bit error rate performances are compared to the performance of the classical SC method.Article Low latency hybrid structures ınvolving convolutional product like codes and space time codes(Springer, 2017) Gazi, Orhan; Gazi, Orhan; Al-Kattan, Ahmed A. S.; 102896In this paper, we propose new joint serially concatenated communication structures constructed from convolutional product codes and space time codes. The proposed structures are suitable for parallel processing operations and they have very low decoding latencies compared to their classical counterparts. Use of multi-antennas increases the spectral efficiency of the joint structures.Article Noise-Aided Belief Propagation List Decoding of Polar Codes(Ieee-inst Electrical Electronics Engineers inc, 2019) Arli, A. Cagri; Gazi, Orhan; Gazi, Orhan; 102896; 206005Noise can help weak information bearing signal to be detected in nonlinear systems by the use of stochastic perturbation. In this letter, we propose a novel belief propagation list (BPL) decoder that relies on artificial noise. The proposed decoder is constructed by using parallel independent BP decoders. Noise with different powers are added to different BP decoders that runs in parallel, and the output of the decoder that pass the early detection and termination criteria check is considered as the recovered data. Adding small amount of noise enables the decoder to handle un-converged errors. The obtained results show that the performance of noise-aided BPL decoder is much better than the performances of BP, successive cancelation (SC), and successive cancelation list (SCL) decoders, and it is a bit behind of cyclic redundancy check aided SCL in terms of bit-error rate performance.Article Turbo product codes based on convolutional codes(Wiley, 2006) Gazi, Orhan; Gazi, Orhan; Yilmaz, Ali Ozgur; 102896; 111575In this article, we introduce a new class of product codes based on convolutional codes, called convolutional product codes. The structure of product codes enables parallel decoding, which can significantly increase decoder speed in practice. The use of convolutional codes in a product code setting makes it possible to use the vast knowledge base for convolutional codes as well as their flexibility in fast parallel decoders. Just as in turbo codes, interleaving turns out to be critical for the performance of convolutional product codes. The practical decoding advantages over serially-concatenated convolutional codes are emphasized.Article Zero state doped turbo equalizer(Ieee-inst Electrical Electronics Engineers inc, 2007) Gazi, Orhan; Gazi, Orhan; Yilmaz, A. Ozgur; 102896; 111575Although iterative equalizers perform well at low signal to noise ratios, high latency is a major disadvantage for their use in practical communication systems. In this article we propose zero state doped turbo equalizers (ZSDTEs) which can be processed in parallel and have significantly reduced processing delays. The proposed technique shows better performance when compared to the sliding window method.
