Papers by mohsen khansari
In the present work, we studied the α- 4He particle elastic scattering by measuring cross section... more In the present work, we studied the α- 4He particle elastic scattering by measuring cross section with halo Effective Field Theory (hEFT) at low energies. In this article, we considered α- 4He elastic scattering in S-wave state at the very low energy. The α- 4He elastic scattering amplitude comprises the initial s-wave strong and Coulomb interaction at leading order. Because of the unnaturally large scattering length of the aαα, it is considered as a halo system. We defined the lagrangian of this system and then calculated the T-matrix for the scattering amplitude at leading order by using of the Feynman diagrams. Data of the α- 4He elastic scattering refer basically to the low energy extending to 0.29 MeV, the total cross section that with this approach has been calculated will be σ_t≃ 16:0226 mb. It was shown that, the presented strategy can be efficiently developed for the other halo nucleus.
International Journal of Theoretical Physics, 2019
In quantum information theory, fidelity is a measure of the closeness of the two quantum states. ... more In quantum information theory, fidelity is a measure of the closeness of the two quantum states. In this work we consider the fidelity for W state in several noisy channels and calculate this parameter for these noisy channels. We showed that the fidelity is approximately equivalent in Pauli channels σ z , σ x (σ y) and fidelity for Pauli channels σ x and Pauli channels σ y , are the same. But in depolarizing channel, the fidelity decreases faster than those three channels (Pauli channels σ x , σ y , σ z). Also, if the system does not interact with the environment, the fidelity stays fixed and at all times is equal to one(1). If the interaction between the system and the environment is strong, all the diagrams of fidelity slow down quickly with increasing time.
An efficient MIMO receiver structure for coded signals
The 8th International Conference on Communication Systems, 2002. ICCS 2002.
Page 1. AN EFFICIENT MIMO RECEIVER STRUCTURE FOR CODED SIGNALS Ebrabim brami'",... more Page 1. AN EFFICIENT MIMO RECEIVER STRUCTURE FOR CODED SIGNALS Ebrabim brami'", Mohsen Shiva', and Mohsen Khansari' I Department of Electrical and Computer Engineering, Faculty of Engineering, ... (3) E(H) = l$-HU$ = d(r-Hq(r-Hd] ...
An efficient multiuser detection algorithm for CDMA signals
Proceedings ISCC 2002 Seventh International Symposium on Computers and Communications
In this paper, an efficient method for multiuser detection of CDMA signal is proposed, that provi... more In this paper, an efficient method for multiuser detection of CDMA signal is proposed, that provides soft output with remaining noise distribution close to the Gaussian. Therefore the proposed algorithm is efficient for both coded and uncoded signals. This algorithm is simulated for BPSK signals with random spreading. The performance of the receiver is analyzed in terms of BER and
Uploads
Papers by mohsen khansari