Abstract: A frequency allocation method includes receiving, by a control device, a frequency allocation message using a dedicated channel, wherein the frequency allocation message carries a node identifier and a received signal strength information for a frequency, and determining, according to the frequency allocation message, a station needing frequency allocation, and obtaining node information of each station in a network. The method further includes computing, according to the received signal strength information for the frequency of the station needing frequency allocation and further according to the node information of each station, an optimum working frequency of the station needing frequency allocation, and allocating the optimum working frequency to the station needing frequency allocation.

Abstract: A frequency allocation method includes receiving, by a control device, a frequency allocation message using a dedicated channel, wherein the frequency allocation message carries a node identifier and a received signal strength information for a frequency, and determining, according to the frequency allocation message, a station needing frequency allocation, and obtaining node information of each station in a network. The method further includes computing, according to the received signal strength information for the frequency of the station needing frequency allocation and further according to the node information of each station, an optimum working frequency of the station needing frequency allocation, and allocating the optimum working frequency to the station needing frequency allocation.

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?).