Isothermal vapor-liquid equilibrium (VLE) data are measured for ethanol + dimethyl carbonate (DMC), DMC + 1-propanol, and DMC + 1-butanol at T ) 333.15 K by a using headspace gas chromatography (HSGC) method. The binary systems containing ethanol and 1-propanol have minimum boiling azeotropes. The experimental binary VLE data were correlated with common g E model equations. Excess molar volumes (V E ) of ethanol + DMC, 1-propanol + DMC, and 1-butanol + DMC are obtained from the measured densities at T ) 298.15 K by using a digital vibrating tube densimeter. All measured V E are shown positive deviation from ideal mixing and are correlated with the five-parameter Redlich-Kister polynomial.

Excess molar volumes (V  E) of dimethyl carbonate (DMC) + benzene, DMC + toluene, DMC + n-heptane, and DMC + isooctane are obtained from the measured densities at 298.15 K by using a digital vibrating-tube densimeter. All the measured excess molar volumes are correlated with the five-parameter Redlich−Kister polynomial. Isothermal vapor−liquid equilibrium (VLE) data are measured for the binary systems of benzene + DMC, DMC + toluene, DMC + n-heptane, and DMC + isooctane at 333.15 K by a using headspace gas chromatography (HSGC) method. The experimental binary VLE data were correlated with common g E model equations.

Isothermal vapor−liquid equilibria (VLE) and excess molar enthalpies (H E) for the binary systems of dimethyl ether (DME) with n-decane, n-dodecane, 1-octene, 1-decene, benzene, toluene, and water were measured at 323.15 K with a computer-driven static apparatus and an isothermal flow calorimeter, respectively. None of the measured binary systems show azeotropic behavior at this temperature. The system DME + water shows a miscibility gap. The experimental VLE and H E data were correlated with different G E models and the Redlich−Kister polynomial.

To resolve frequency ambiguity of tiered polyphase code (TPC), a differential encoding method to the secondary code of the TPC is proposed. By performing differential decoding, the frequency ambiguity is removed and the code sequence boundary is correctly found. In addition, the correlation results at the receiver can be used as a frequency offset estimator. Analysis on the receiver operations and the simulation results show that the proposed tiered differential‐PC makes the code sequence boundary detection correctly under the frequency offset of up to several hundred hertz. The root mean squared error of the frequency offset estimation is reduced to <10 Hz under operating signal‐to‐noise power ratio which is about −35 dB.