An Experimental Investigation of Enhanced SM-OFDM Over Indoor Rician Multipath Channels

In this Correspondence, we investigate enhanced spatial modulation (ESM) aided orthogonal frequency division multiplexing (OFDM) systems. ESM extends the conventional SM by introducing a series of signal constellations. Existing research shows that ESM displays performance superiority over SM in flat-fading channels. For frequency-selective fading channels, we design a practical implementation of an ESM&SM aided OFDM hybrid system to characterize the bit error rate (BER) performance of ESM and conventional SM with an experimental wireless testbed. From the experimental results, it is found that ESM achieves better BER performance than SM on frequency selective channels, which are consistent with the Monte Carlo simulation results

Octane-1,8-diyldipyridinium dibromide dihydrate

The asymmetric unit of the title compound, C18H26N2 2+·2Br−·2H2O, consists of one-half of the organic cation, one Br− anion and one water mol­ecule. The organic cation is situated on a centre of inversion. The dihedral angle between the pyridine ring and the plane of the central linkage is 59.3 (1)°. The cations, anions and water mol­ecules are linked via O—H⋯Br, C—H⋯Br and C—H⋯O hydrogen bonds, forming a three-dimensional framework