2010 7th IEEE Consumer Communications and Networking Conference, 2010
Page 1. A Fixed Complexity Velocity Estimation Method for Mobile MIMO Users Salman A. Khan, Depar... more Page 1. A Fixed Complexity Velocity Estimation Method for Mobile MIMO Users Salman A. Khan, Department of Electrical and Computer Engineering, McGill University 3480 University St., Montréal, Québec, Canada H3A 2A7, Email: salman.khan2@mail.mcgill.ca ...
2010 7th IEEE Consumer Communications and Networking Conference, 2010
Page 1. Impact of Direct Sequence Spreading on the Channel Capacity of Binary Non-Gaussian CDMA S... more Page 1. Impact of Direct Sequence Spreading on the Channel Capacity of Binary Non-Gaussian CDMA Salman A. Khan and Jan Bajcsy Electrical and Computer Engineering, McGill University, Montréal, Québec, Canada salman.khan2@mail.mcgill.ca, jan.bajcsy@mcgill.ca ...
2012 IEEE International Conference on Communications (ICC), 2012
ABSTRACT This paper explores chip-asynchronous CDMA transmission when single-user demodulation an... more ABSTRACT This paper explores chip-asynchronous CDMA transmission when single-user demodulation and decoding are used at the receiver. First, a chip-level channel model is presented to account for chip-asynchronism between different users. Using the model, the symmetric capacity of chip-asynchronous CDMA is investigated. Numerical results indicate that a sum rate of 2 bits per channel use is achievable when chip symbols {-1, 1} are utilized in appropriate non-equiprobable fashion. This represents over a 2.5 times capacity gain over traditional uniform chip signaling in chip-synchronous CDMA. Consequently, the symmetric sum capacity is further investigated when the zero chip symbol is also utilized for CDMA transmission. The obtained capacity results indicate that nonuniform signaling with {-1,0,+1} chip symbols can lead to an energy efficient CDMA transmission scheme which could achieve energy savings of up to 3 dB over the traditional CDMA with equiprobable {-1, +1} chip symbols.
AbstractAnt colony optimization (ACO) is a powerful opti-mization technique that has been applie... more AbstractAnt colony optimization (ACO) is a powerful opti-mization technique that has been applied to solve a number of complex optimization problems. One such optimization problem is network topology design of distributed local area networks (DLANs). The problem ...
Abstract Placement of wind turbines (WTP) in a wind farm is a complex optimization problem, consi... more Abstract Placement of wind turbines (WTP) in a wind farm is a complex optimization problem, consisting of a number of design objectives and constraints. Although computational intelligence techniques have been applied to solve different versions of this ...
2010 7th IEEE Consumer Communications and Networking Conference, 2010
Page 1. A Fixed Complexity Velocity Estimation Method for Mobile MIMO Users Salman A. Khan, Depar... more Page 1. A Fixed Complexity Velocity Estimation Method for Mobile MIMO Users Salman A. Khan, Department of Electrical and Computer Engineering, McGill University 3480 University St., Montréal, Québec, Canada H3A 2A7, Email: salman.khan2@mail.mcgill.ca ...
2010 7th IEEE Consumer Communications and Networking Conference, 2010
Page 1. Impact of Direct Sequence Spreading on the Channel Capacity of Binary Non-Gaussian CDMA S... more Page 1. Impact of Direct Sequence Spreading on the Channel Capacity of Binary Non-Gaussian CDMA Salman A. Khan and Jan Bajcsy Electrical and Computer Engineering, McGill University, Montréal, Québec, Canada salman.khan2@mail.mcgill.ca, jan.bajcsy@mcgill.ca ...
2012 IEEE International Conference on Communications (ICC), 2012
ABSTRACT This paper explores chip-asynchronous CDMA transmission when single-user demodulation an... more ABSTRACT This paper explores chip-asynchronous CDMA transmission when single-user demodulation and decoding are used at the receiver. First, a chip-level channel model is presented to account for chip-asynchronism between different users. Using the model, the symmetric capacity of chip-asynchronous CDMA is investigated. Numerical results indicate that a sum rate of 2 bits per channel use is achievable when chip symbols {-1, 1} are utilized in appropriate non-equiprobable fashion. This represents over a 2.5 times capacity gain over traditional uniform chip signaling in chip-synchronous CDMA. Consequently, the symmetric sum capacity is further investigated when the zero chip symbol is also utilized for CDMA transmission. The obtained capacity results indicate that nonuniform signaling with {-1,0,+1} chip symbols can lead to an energy efficient CDMA transmission scheme which could achieve energy savings of up to 3 dB over the traditional CDMA with equiprobable {-1, +1} chip symbols.
AbstractAnt colony optimization (ACO) is a powerful opti-mization technique that has been applie... more AbstractAnt colony optimization (ACO) is a powerful opti-mization technique that has been applied to solve a number of complex optimization problems. One such optimization problem is network topology design of distributed local area networks (DLANs). The problem ...
Abstract Placement of wind turbines (WTP) in a wind farm is a complex optimization problem, consi... more Abstract Placement of wind turbines (WTP) in a wind farm is a complex optimization problem, consisting of a number of design objectives and constraints. Although computational intelligence techniques have been applied to solve different versions of this ...
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