Abstract: The present invention relates to the field of communications technologies and discloses a data processing method and apparatus to obtain a DPD non-linear distortion compensation coefficient under a QPSK mode. The embodiments of the present invention receive a first data flow, and perform interpolation into the first data flow to obtain a second data flow; receive a third data flow, and calculate a data flow signal quality difference between the third data flow and the second data flow; and obtain a DPD non-linear distortion compensation coefficient according to the data flow signal quality difference and the third data flow or the second data flow. The embodiments of the present invention are applicable to the scenarios of obtaining a DPD non-linear distortion compensation coefficient in QPSK mode.

Abstract: The present invention relates to the field of communications technologies and discloses a data processing method and apparatus to obtain a DPD non-linear distortion compensation coefficient under a QPSK mode. The embodiments of the present invention receive a first data flow, and perform interpolation into the first data flow to obtain a second data flow; receive a third data flow, and calculate a data flow signal quality difference between the third data flow and the second data flow; and obtain a DPD non-linear distortion compensation coefficient according to the data flow signal quality difference and the third data flow or the second data flow. The embodiments of the present invention are applicable to the scenarios of obtaining a DPD non-linear distortion compensation coefficient in QPSK mode.

Abstract: A signal processing apparatus for processing an input signal (x) has an adaptive predistorter, an amplifier and a down-converter. The amplifier is configured to amplify a processed signal (y?) to obtain an amplified signal (y?). The down-converter is configured to multiply a version of the processed signal (y?) with a version of the amplified signal (y?), one of the signal versions being phase shifted, to obtain a first down-converted signal (z1, z1?), and to multiply the processed signal (y?) with the amplified signal (y?) to obtain a second down-converted signal (z2, z2?). The predistorter is configured to predistort the input signal (x) according to a predistortion characteristic to obtain the processed signal (y?), the predistorter being further configured to adapt the predistortion characteristic based on the first down-converted signal (z1, z1?) and the second down-converted signal (z2, z2?).

Abstract: A phase error compensation arrangement comprising a first phase error compensator and a second phase error compensator arranged downstream of the first phase error compensator. The first phase error compensator is configured to obtain a first estimated phase error ((?PS) of the receive signal based on a value of the receive signal and a predefined pilot value, to shift a phase of the receive signal by the first estimated phase error (?PS), and to provide the phase shifted receive signal to the second phase error compensator.

Abstract: A method for the synthesis of serinol and serinol derivatives substituted at the nitrogen atoms by reacting a lower 1,3-dialkoxy-isopropyl halide with ammonia or an amine to form a 1,3-dialkoxy-isopropylamine and then removing the ether groups by heating with a hydrogen halide acid. The method allows the production of serinol and serinol derivatives using inexpensive starting materials in a simple manner and obtaining a high purity product which is free of interfering isomers. Novel compounds obtained by the method which are useful as pharmaceutical intermediates, X-ray contrasting agents and cytostatic or psychopharmacological drugs are also disclosed.

Abstract: Colorless O,O-dimethyldithiophosphoric acid is produced by reaction between a phosphorus sulfide, in particular P.sub.4 S.sub.7 or P.sub.4 S.sub.10, and methanol, at temperatures of 60.degree.-75.degree. C, with short reaction times, and using toluene as diluent. Colorless alkaline salts of the acid are obtained by neutralizing the toluene solution of the acid at a temperature higher than 30.degree. C and at a pH maintained at 2 to 6.