Abstract-This paper presents the construction and perfor-mance of rate adaptive generalized conca... more Abstract-This paper presents the construction and perfor-mance of rate adaptive generalized concatenated codes (GCCs) based on linear block codes over Rayleigh fading Multi Input Multi Output (MIMO) communication channels with N transmit and N receive antennas. The ...
Iterative decoding of block codes is a rather old subject that regained much interest recently. T... more Iterative decoding of block codes is a rather old subject that regained much interest recently. The main idea behind iterative decoding is to break up the decoding problem into a sequence of stages, iterations, such that each stage utilizes the output from the previous stages to formulate its own result. In order for the iterative decoding algorithms to be practically feasible, the complexity in each stage, in terms of number of operations and hardware complexity, should be much less than that for the original non-iterative decoding problem. At the same time, the performance should approach the optimum, maximum likelihood decoding performance in terms of bit error rate.
2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060), 2000
Many block codes can be represented as an intersection of two or more easily decoded codes. We pr... more Many block codes can be represented as an intersection of two or more easily decoded codes. We present a new decoding algorithm for decoding product codes that utilizes this property. It will be shown that this algorithm is maximum-likelihood decoding. The complexity of the algorithm depends on the decoding complexity of the constituent codes and the quality of the channel
Abstract The effects of channel estimation errors on the channel capacity of a discrete time, dis... more Abstract The effects of channel estimation errors on the channel capacity of a discrete time, discrete input, infinite output Rayleigh fading channel are investigated. The case of conventional modulation methods such as phase shift keying (PSK) and quatrature amplitude modulation (QAM) is investigated at first where it was observed that the capacity degrades rapidly with increasing channel estimation errors. The effect of error in the channel estimation is similar to the effect of higher noise in the channel that depends on the ...
Abstract-This paper presents the construction and perfor-mance of rate adaptive generalized conca... more Abstract-This paper presents the construction and perfor-mance of rate adaptive generalized concatenated codes (GCCs) based on linear block codes over Rayleigh fading Multi Input Multi Output (MIMO) communication channels with N transmit and N receive antennas. The ...
Iterative decoding of block codes is a rather old subject that regained much interest recently. T... more Iterative decoding of block codes is a rather old subject that regained much interest recently. The main idea behind iterative decoding is to break up the decoding problem into a sequence of stages, iterations, such that each stage utilizes the output from the previous stages to formulate its own result. In order for the iterative decoding algorithms to be practically feasible, the complexity in each stage, in terms of number of operations and hardware complexity, should be much less than that for the original non-iterative decoding problem. At the same time, the performance should approach the optimum, maximum likelihood decoding performance in terms of bit error rate.
2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060), 2000
Many block codes can be represented as an intersection of two or more easily decoded codes. We pr... more Many block codes can be represented as an intersection of two or more easily decoded codes. We present a new decoding algorithm for decoding product codes that utilizes this property. It will be shown that this algorithm is maximum-likelihood decoding. The complexity of the algorithm depends on the decoding complexity of the constituent codes and the quality of the channel
Abstract The effects of channel estimation errors on the channel capacity of a discrete time, dis... more Abstract The effects of channel estimation errors on the channel capacity of a discrete time, discrete input, infinite output Rayleigh fading channel are investigated. The case of conventional modulation methods such as phase shift keying (PSK) and quatrature amplitude modulation (QAM) is investigated at first where it was observed that the capacity degrades rapidly with increasing channel estimation errors. The effect of error in the channel estimation is similar to the effect of higher noise in the channel that depends on the ...
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Papers by Omar Al-Askary