Marwan H. Azmi

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We investigate LDPC code design for a multi-source single-relay system, with uniform phase-fading Gaussian channels. We specifically consider the asymmetric channels for multiple sources, where the channel condition for each source in the system is different. We focus on LDPC code design when network coding (NC) at the relay is utilized. For the asymmetric(More)
—We consider the design of bilayer-expurgated low-density parity-check (BE-LDPC) codes as part of a decode-and-forward protocol for use over the full-duplex relay channel. A new ensemble of codes, termed multi-edge-type bilayer-expurgated LDPC (MET-BE-LDPC) codes, is introduced where the BE-LDPC code design problem is transformed into the problem of(More)
— This paper presents an improved LDPC code design for decode-and-forward relay system. Our design is based on the recent work of bilayer LDPC code structures. We introduce an irregular check node degree distribution for the lower and hyper (overall) bilayer LDPC code Tanner graphs. We derive the exact relationship between the lower and hyper graphs in(More)
Cooperative communication is a well known technique to yield transmit diversity in the case of fading channels and to increase the spectral efficiency in the case of Gaussian channels. Error-correcting codes have to be carefully designed to achieve the promised gains. Good LDPC codes are known for fading channels and for Gaussian channels, but an LDPC code(More)
— This paper studies the problem of finding the optimum degree distribution for the distributed LDPC codes in the two-way relay channels. Based on the framework of multi-edge type (MET) LDPC codes, we propose a methodology to asymptotically optimize the code's ensemble when different segments within the distributed codeword have been transmitted through(More)
—In this paper we investigate a multi-source LDPC scheme for a Gaussian relay system, where M sources communicate with the destination under the help of a single relay (M − 1 − 1 system). Since various distributed LDPC schemes in the cooperative single-source system, e.g. bilayer LDPC [1] and bilayer multi-edge type LDPC (BMET-LDPC) [2], have been designed(More)
difficulties in development of the research model and her unique sense of humors. I also would like to thank to Mr. Marwan Hadri Azmi for the translation of the thesis's abstract and his cooperation during my research project. I also would like to thank all my friends at Wireless Communication Center (WCC) and Digital signal processing (DSP) LAB for(More)