Abstract: A predistortion method and apparatus, wherein the predistortion method includes: sending a first sequence, and storing the sent first sequence; receiving a second sequence that is fed back, where the second sequence is a sequence obtained after sampling is performed on the first sequence that suffers distortion; obtaining a third sequence after performing sampling on the stored first sequence, where a sampling rate for obtaining the third sequence through sampling is the same as a sampling rate for obtaining the second sequence through sampling; and determining, based on the second sequence and the third sequence, a linear distortion coefficient corresponding to each of at least one Nyquist interval in a spectrum for sending a signal, where the linear distortion coefficient is used to perform linear compensation on the sent signal.

Abstract: A method, device and system for complex carrier modulation are provided in the disclosure, wherein e?i?t or ei?t is used as a carrier frequency to perform carrier modulation on a to-be-carried signal. The modulated signal transmitted in a medium is a rotating complex signal. The method can enable right and left frequency bands to carry independent information. Therefore the spectrum utility ratio is improved. Employing the method for complex carrier modulation provided in the disclosure can use the right and left frequency spectrum resources adequately, and the loss of signal energy is small, therefore the capacity of a channel is improved greatly.

Abstract: The disclosure provides a channel decoding method and a tail biting convolutional decoder. The method comprises: the tail biting convolutional decoder performs add-compare-select processing on metric values of 2N states according to input data to be decoded and N zeros input after the data to obtain final cumulative metric values of the 2N states, and stores selection result of add-compare-select processing, wherein N is the constraint length of tail biting convolutional coding; the tail biting convolutional decoder starts to backtrack from one state of the 2N states according to the selection result to obtain intermediate decoding result after the add-compare-select processing is finished; the tail biting convolutional decoder outputs the bits except the last N bits of the intermediate decoding result as decoded result of the data to be decoded. The tail biting convolutional decoder comprises an add-compare-select module, a backtracking module and an outputting module.

Abstract: A method for configuring a service and a method and apparatus for rate matching in a TD-SCDMA system, this method for configuring the service includes: taking that a check bit puncturing ratio should be more than 7i+a or less than 7i?a as a newly added constraint condition, and the check bit puncturing ratios of each configured service being outside a range of [7i+a, 7i?a], the method for rate matching includes: when puncturing each path of check bits of the current data block, if a difference between a position Pk of kth reserved check bit calculated according to a method defined by the service and a previously determined position NPk?1 of k?1th reserved check bit is a positive integral multiple of 7, determining a position NPk of kth reserved check bit as Pk plus 1 or Pk minus 1, and Pk plus 1 and Pk minus 1 requiring carrying out alternately.

Abstract: A method and apparatus for rate matching are disclosed by the invention, wherein the method includes: determining an initial value according to the total amount of data in the data stream and a predetermined initial offset value; performing an accumulation processing and an even distribution processing on said initial value and the amount of the data needing rate matching; determining the data needing rate matching from the data stream according to the processing result. With the solution proposed by the invention, a rate matching method using even distribution principle and accumulation principle can be determined. The method is simple, clear and accurate, and can be understood easily.

Abstract: A method and device for complex carrier demodulation are provided by the disclosure. The method includes: demodulating modulated signals using complex signals e?i?t or ei?t as carrier signals to obtain complex carrier demodulation signals. Therefore, the utilization rate of spectrums is improved. With the method for complex carrier demodulation provided by the disclosure, the left and right frequency spectrum resources are fully utilized, the loss of signal energy is little, thereby the channel capacity is improved greatly.

Abstract: The disclosure provides a channel decoding method and a tail biting convolutional decoder. The method comprises: the tail biting convolutional decoder performs add-compare-select processing on metric values of 2N states according to input data to be decoded and N zeros input after the data to obtain final cumulative metric values of the 2N states, and stores selection result of add-compare-select processing, wherein N is the constraint length of tail biting convolutional coding; the tail biting convolutional decoder starts to backtrack from one state of the 2N states according to the selection result to obtain intermediate decoding result after the add-compare-select processing is finished; the tail biting convolutional decoder outputs the bits except the last N bits of the intermediate decoding result as decoded result of the data to be decoded. The tail biting convolutional decoder comprises an add-compare-select module, a backtracking module and an outputting module.

Abstract: A method, device and system for complex carrier modulation are provided in the disclosure, wherein e?i?t or ei?t is used as a carrier frequency to perform carrier modulation on a to-be-carried signal. The modulated signal transmitted in a medium is a rotating complex signal. The method can enable right and left frequency bands to carry independent information. Therefore the spectrum utility ratio is improved. Employing the method for complex carrier modulation provided in the disclosure can use the right and left frequency spectrum resources adequately, and the loss of signal energy is small, therefore the capacity of a channel is improved greatly.

Abstract: A method and device for complex carrier demodulation are provided by the disclosure. The method includes: demodulating modulated signals using complex signals e?i?t or ei?t as carrier signals to obtain complex carrier demodulation signals. Therefore, the utilization rate of spectrums is improved. With the method for complex carrier demodulation provided by the disclosure, the left and right frequency spectrum resources are fully utilized, the loss of signal energy is little, thereby the channel capacity is improved greatly.

Abstract: A method for configuring a service and a method and apparatus for rate matching in a TD-SCDMA system, this method for configuring the service includes: taking that a check bit puncturing ratio should be more than 7i+a or less than 7i?a as a newly added constraint condition, and the check bit puncturing ratios of each configured service being outside a range of [7i+a, 7i?a], the method for rate matching includes: when puncturing each path of check bits of the current data block, if a difference between a position Pk of kth reserved check bit calculated according to a method defined by the service and a previously determined position NPk-1 of k?1th reserved check bit is a positive integral multiple of 7, determining a position NPk of kth reserved check bit as Pk plus 1 or Pk minus 1, and Pk plus 1 and Pk minus 1 requiring carrying out alternately.

Abstract: A method for realizing IFFT by FFT is provided, which comprises: performing a left mirror permutation on an input data sequence, then performing FFT, and dividing the result with N, so as to obtain IFFT processing data; or performing FFT on an input data sequence, then performing a left mirror permutation on the result of FFT and being divided by N, so as to obtain IFFT processing data; the left mirror permutation is: inverting the sequence of the other data except the first data; the N is the length of the input data sequence. Also, an IFFT processing apparatus comprising an FFT computing unit and a left mirror permutation unit is provided.

Abstract: A method and apparatus for rate matching are disclosed by the invention, wherein the method includes: determining an initial value according to the total amount of data in the data stream and a predetermined initial offset value; performing an accumulation processing and an even distribution processing on said initial value and the amount of the data needing rate matching; determining the data needing rate matching from the data stream according to the processing result. With the solution proposed by the invention, a rate matching method using even distribution principle and accumulation principle can be determined. The method is simple, clear and accurate, and can be understood easily.