N-[(E)-4-Chloro­benzyl­idene]-2,4-dimethyl­aniline

The title mol­ecule, C15H14ClN, exists in a trans configuration with respect to the C=N bond [1.2813 (16) Å]. The dihedral angle between the benzene rings is 52.91 (6)°. The crystal structure is stabilized by weak inter­molecular C—H⋯π inter­actions

2-{[(E)-2-Hy­droxy­benzyl­idene]amino}-1H-isoindole-1,3(2H)-dione

In the title compound, C15H10N2O3, the isoindoline ring system is almost planar [maximum deviation = 0.020 (2) Å] and makes a dihedral angle of 1.57 (7)° with the benzene ring. Intra­molecular O—H⋯N and C—H⋯O hydrogen bonds are observed

3-{1-[4-(2-Methyl­prop­yl)phen­yl]eth­yl}-4-phenyl-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C20H23N3S, the central 1,2,4-triazole ring makes dihedral angles of 69.76 (9) and 81.69 (8)°, respectively, with the phenyl and benzene rings. In the crystal, mol­ecules are linked into a centrosymmetric dimer by a pair of inter­molecular N—H⋯S hydrogen bonds, generating an R 2 2(8) ring motif

6-(4-Chloro­phen­yl)-2-isobutyl­imidazo[2,1-b][1,3,4]thia­diazole

In the title compound, C14H14ClN3S, the imidazo[2,1-b][1,3,4]thia­diazole system is essentially planar, with a maximum deviation of 0.006 (2) Å. The dihedral angle between the imidazo[2,1-b][1,3,4]thia­diazole and chloro­phenyl rings is 5.07 (8)°. In the crystal, there are no classical hydrogen bonds but stabilization is provided by weak π–π [centroid–centroid distance = 3.5697 (11) Å] and C—H⋯π inter­actions

2-Isobutyl-6-phenyl­imidazo[2,1-b][1,3,4]thia­diazole

In the title compound, C14H15N3S, the imidazo[2,1-b][1,3,4]thia­diazole fused-ring system is close to planar, with a maximum deviation of 0.042 (1) Å, and the dihedral angle between it and the phenyl ring is 24.21 (6)°. The isobutyl group is disordered over two sets of sites in a 0.899 (9):0.101 (9) ratio. In the crystal, weak aromatic π–π stacking inter­actions involving the imidazole and thia­diazole rings with a centroid–centroid distance of 3.8067 (7) Å occur

(E)-3-(4-Chloro­phen­yl)-1-(2,3,4-trichloro­phen­yl)prop-2-en-1-one

In the title chalcone derivative, C15H8Cl4O, the C=C double bond exists in an E configuration and the dihedral angle between the two benzene rings is 48.13 (11)°. In the crystal, mol­ecules are arranged into columns and stacked down the a axis featuring possible weak aromatic π–π stacking inter­actions [centroid–centroid separation = 3.888 (2) Å]

(5E)-5-(4-Meth­oxy­benzyl­idene)-2-(piperidin-1-yl)-1,3-thia­zol-4(5H)-one

In the title compound, C16H18N2O2S, the piperidine ring adopts a chair conformation. The central 4-thia­zolidinone ring makes dihedral angles of 12.01 (7) and 51.42 (9)°, respectively, with the benzene ring and the least-squares plane of the piperidine ring. An intra­molecular C—H⋯S hydrogen bond stabilizes the mol­ecular structure and generates an S(6) ring motif. In the crystal, mol­ecules are linked into a tape along the c axis by inter­molecular C—H⋯O hydrogen bonds

BER Analysis of Full Duplex Relay assisted BPSK-SIM based VLC System for Indoor Applications

This paper contemplates a relay-assisted visible light communication (VLC) system, where the light source (Table lamp) acts as a relay node and cooperates with the main light source. Following the IEEE 802.15.7r1 VLC reference channel model, we assume that there are two different light sources present in an office room. The first one is the source terminal present on the ceiling and another one is the desk lamp that serves as the relay station which works in full-duplex method. Because of the loop interference channel, we model VLC relay terminal using ray tracing simulations. We have analyzed bit error rate (BER) performance of the relay-assisted VLC system using binary phase shift keying-subcarrier intensity modulation (BPSK-SIM) technique. The proposed method outperforms existing phase shift keying (PSK) and square M-quadrature amplitude modulation (M-QAM) techniques. The proposed VLC system using BPSK-SIM technique achieves a BER performance of for an SNR of 20 dB. The results of proposed full duplex and half duplex relayed VLC system are evaluated using equal power allocation (EPA) and optimum power allocations (OPA) techniques over three different modulation schemes which are 2-PSK, square M-QAM, BPSK-SIM

(E)-1-(3,4-Dimeth­oxy­phen­yl)-3-[4-(methyl­sulfan­yl)phen­yl]prop-2-en-1-one

In the title compound, C18H18O3S, the C=C double bond exists in an E configuration and the dihedral angle between the two benzene rings is 11.74 (8)°. In the crystal, mol­ecules are linked into a three-dimensional network by C—H⋯O hydrogen bonds. The crystal structure is also stabilized by weak C—H⋯π inter­actions

N′-(4-Chloro­benzyl­idene)-2-[4-(methyl­sulfan­yl)phen­yl]acetohydrazide

In the title compound, C16H15ClN2OS, the hydrazine group is twisted slightly: the C—N—N—C torsion angle is 175.46 (13)°. The dihedral angle between the two terminal aromatic rings is 87.01 (8)°. In the crystal, inversion dimers linked by pairs of N—H⋯O hydrogen bonds generate R 2 2(8) loops. The dimers are further linked by weak C—H⋯π inter­actions