Abstract: Disclosed is a method for data transmission, comprising: generating the parity check matrix on the basis of the generating sequence corresponded to the preserved row generator; encoding the input data by the generated matrix obtained by said parity check matrix, and obtaining the output data comprising the parity check information. Also provided in the present invention is an apparatus for data transmission. The method and apparatus of the present invention could make the parity check matrix take the minimum storage space.

Abstract: The present disclosure provides a method and apparatus for transmitting the beamforming matrix. The method includes calculating the maximum value mv(k) of the real part and imaginary part of the elements in subcarrier's beamforming matrix; carrying out a M bits quantization to mv(k) and obtaining the quantization amplitude Mv(k), calculating the linear part Mvlin(k) of Mv(k); carrying out a respectively Nb bits quantization to the real part and imaginary part of every element in V(k) by Mvlin(k), and obtaining the quantized beamforming matrix Vq(k); Nb is positive integer; transmitting said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k).

Abstract: A method and apparatus for transmitting and receiving data are disclosed. The method for transmitting data, comprising encapsulating one or multiple media access control protocol data units (MPDU) as a group media access control protocol data unit (G-MPDU) based on a length of the group media access control protocol data unit G-MPDU; fragmenting a current MPDU according to a residual length to obtain a fragmented MPDU when the residual length is insufficient to encapsulate the current MPDU; encapsulating the fragmented MPDU to the G-MPDU; and transmitting the encapsulated G-MPDU. The method ensures a high data transmission rate and does not wasting excess time to execute the fragmentation processing. The method also ensures a high resource utilization rate, utilizing fully the remaining length of the data unit.

Abstract: The present disclosure provides a method and apparatus for transmitting the beamforming matrix. The method includes calculating the maximum value mv(k) of the real part and imaginary part of the elements in subcarrier's beamforming matrix; carrying out a M bits quantization to mv(k) and obtaining the quantization amplitude mv(k), calculating the linear part mvlin(k) of mv(k);carrying out a respectively Nb bits quantization to the real part and imaginary part of every element in V(k) by mvlin(k), and obtaining the quantized beamforming matrix Vq(k); Nb is positive integer; transmitting said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k).

Abstract: The present disclosure provides a method and apparatus for transmitting and receiving Channel State Information. The said transmitting method includes calculating the maximum value mH(k) of real part and imaginary part of each element in CSI matrix Heff(k) of the sub-carrier; carrying out M bit quantization to mH(k) to obtain the quantization amplitude MH(k); calculating the linear portion MHlin(k) of MH(k); using MHlin(k) for carrying out Nb bit quantization to real part and imaginary part of each element in Heff(k) respectively to obtain the quantized CSI matrix Heff(k); Nb being a positive integer; and transmitting said quantization amplitude MH(k) and said quantized CSI matrix Heffq(k).

Abstract: Disclosed is a method for data transmission, comprising: generating the parity check matrix on the basis of the generating sequence corresponded to the preserved row generator; encoding the input data by the generated matrix obtained by said parity check matrix, and obtaining the output data comprising the parity check information. Also provided in the present invention is an apparatus for data transmission. The method and apparatus of the present invention could make the parity check matrix take the minimum storage space.

Abstract: A device for transmitting digital broadcast signals comprises: at least a first encoding unit, each of which executes forward error correction encoding for data in a sub-channel; at least a time domain interleaving unit, each of which receives the output data from a first encoding unit and interleaves the data in time domain; a first multiplexing unit, for multiplexing the interleaved data to form Main Service Channel (MSC) data a second encoding unit, for executing forward error correction encoding for a second group of data information to acquire Fast Information Channel (FIC) data a differential modulating unit, for performing differential modulation to FIC data, and performing differential modulation to MSC data adopting at least two modulation modes; and a frame generating and transmitting unit, for generating transmission frames using differential modulation symbol sequences generated by the differential and transmitting.

Abstract: A receiver for Terrestrial Mobile Multimedia Broadcasting T-MMB, includes a radio frequency demodulation unit, for carrying out radio frequency demodulation for a received signal; a synchronization unit, for identifying the transmission mode and the synchronous position of the signal from the radio frequency demodulation unit; an OFDM demodulation unit, for extracting a phase reference symbol, Fast Information Channel FIC symbols and data symbols from the signal which is from the radio frequency demodulation unit according to the transmission mode and the synchronous position, carrying out OFDM demodulation and decoding for the FIC symbols to obtain FIC information, carrying out OFDM demodulation for the data symbols of the corresponding sub-channel according to the sub-channel indication information; and a demodulation and decoding unit, for carrying out differential demodulation for the data symbols after the OFDM demodulation, carrying out time-domain deinterleaving for the data symbols after differential

Abstract: A framing method of the common interleaved frame is provided, which includes the following steps: obtaining the position information of each sub-channel in the common interleaved frame; depositing data bits in each sub-channel accordingly based on the position information of each sub-channel and the number of bits comprised in the capacity unit CU; wherein the number of bits comprised in the CU is determined by a symbol mapping mode of each sub-channel. The method can help the skilled in the art to make a CIF with the data bits at the transmitter of the T-MMB system. A framing device of the common interleaved frame is also provided in the present invention.

Abstract: A multiplexing device for orthogonal frequency division multiplexing (OFDM) system comprises a first unit for combining N-path differential-modulation symbol sequences and mapping to sub-carriers of inverse fast Fourier transformation, N is an integer which is greater than 1, and a second unit for executing the IFFT of sub-carriers to realize frequency division multiplexing of multi-path differential-modulation symbol sequences. The multiplexing transmitting device can not only realize multiplexing transmission of multi-path signals in differential OFDM system, but also the device can be very simply realized, the multiplexing method for OFDM system is also disclosed.

Abstract: A device for transmitting digital broadcast signal comprises: at least a first encoding unit, each of which encodes data of a sub-channel with forward error correction encoding; at least a time-domain interleaving unit, each of which receives data output from a first encoding unit and performs interleaving in time-domain on the encoded data; a first multiplexing unit, which multiplexes the interleaved data output from each of the time-domain interleaving unit into Main Service Channel (MSC) data; a second encoding unit, which performs forward error correction encoding on a second set of data to obtain Fast Information Channel (FIC) data; a differential modulating unit, which performs differential modulation on the FIC data by using a first modulation mode and on the MSC data by using a second modulation mode, wherein the modulation level of the first modulation mode is lower than that of the second modulation mode; and a frame generating and transmitting unit, which generates signal unit transmission frames b