摘要:
This disclosure describes methods, apparatus, and systems related to a modulation and coding scheme (MCS) system. The device may determine a wireless communications channel with a first device in accordance with a wireless communications standard. The device may generate a header in accordance with a communication standard, the header including, at least in part, a modulation and coding scheme (MCS) index value. The device may determine a code rate associated with the MCS index value based at least in part on the wireless communications channel. The device may cause to send the header to the first device over the wireless communications channel based at least in part on the MCS index value.
摘要:
A broadcast signal transmitter is disclosed. A broadcast signal transmitter according to an embodiment of the present invention comprises an input formatting module performing baseband formatting and outputting at least one Physical Layer Pipe (PLP) data; a BICM module error-correction processing the PLP data; a framing & interleaving module interleaving the PLP data and generating a signal frame; and a waveform generating module inserting a preamble into the signal frame and generating a broadcast signal by performing OFDM modulation.
摘要:
A method and system for enhancing transmission reliability of video information over a wireless channel is provided. The video information includes pixels, each having a plurality of components and each component including video information bits that are placed in sub-packets within a packet. Error detection information is determined for one or more sub-packets, and placed in the packet. Then the packet is transmitted from a transmitter to a receiver a wireless channel, wherein the receiver uses the error detection information per sub-packet to check for transmission errors and request retransmission of erroneous video information bits based on their perceptual importance.
摘要:
A method and system is provided for transmission of video information pixels over wireless channels, where each video pixel includes a plurality of components and each component comprises video information bits. The information bites are logically grouped into multiple logical groups in a packet, and error detection information is determined for each logical group. The error detection information is placed in the packet, and the packet is transmitted from a transmitter to a receiver over a wireless channel.
摘要:
An encoding apparatus and a method of encoding a source block including different types of data payloads are provided. The method includes dividing the source block into a predetermined number M of sub blocks, generating a predetermined number PI of base parity payloads that correspond to each of the predetermined number M of sub blocks by performing first Forward Error Correction (EEC) encoding on each of the predetermined number M of sub blocks, generating a predetermined number P2 of extended parity payloads that correspond to the source block by performing second PEC encoding on a particular type of data payloads among data payloads that make up the source block, and configuring a source coded block based on a predetermined number N of sub coded blocks including the predetermined number M of sub blocks and the predetermined number PI of base parity payloads generated.
摘要:
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse at least one signal frame from the demodulated broadcast signals, wherein a signal frame includes service data corresponding to each of a plurality of physical paths, a time deinterleaver to time deinterleave service data in the at least one signal frame, a decoder to decode the time deinterleaved service data.
摘要:
Disclosed is a data transmission method of a station (STA) apparatus in a wireless local area network (WLAN) system. The data transmission method according to an embodiment of the present invention includes FEC-encoding transmission data, constellation-mapping the transmission data, inserting a pilot tone into the transmission data, performing inverse discrete Fourier transform (IDFT) on the transmission data, and up-converting the transmission data and transmitting a transmission signal. If an orthogonal frequency division multiple access (OFDMA) scheme is applied to the transmission signal, the transmission signal comprises at least one tone-unit which is a basis for subcarrier allocation of the OFDMA scheme.
摘要:
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals, the apparatus comprises an encoder to encode service data corresponding to each of a plurality of physical paths, a time interleaver to the encoded service data in each physical path by a TI (Time Interleaving) block, wherein at least one virtual FEC block is ahead of FEC blocks in at least one TI block, wherein each TI block includes a variable number of FEC blocks of the encoded service data, wherein a number of the at least one virtual FEC block is defined based on a maximum number of FEC blocks of a TI block, a frame builder to build at least one signal frame including the time interleaved DP data, a modulator to modulate data in the built at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter to transmit the broadcast signals having the modulated data.
摘要:
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals, the apparatus comprises an input formatter for input formatting each data stream divided into a plurality of data transmission path, a generator for generating each of first signaling data and second signaling data, wherein the first signaling data and the second signaling data are processed respectively, wherein the first signaling data includes first information for the second signaling data and the second signaling data includes second information for at least one the data transmission path, wherein the second signaling data includes a static data and a dynamic data, an encoder for encoding, wherein the encoder processing: first encoding service data corresponding to each of the plurality of data transmission path, wherein each of the data transmission path carries at least one service component, second encoding the first signaling data and third encoding the second signaling data, a frame builder for building signal frames, wherein each of signal frames includes the encoded service data and the encoded first signaling data and the encoded second signaling data, a modulator for modulating the signal frames by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals carrying the modulated signal frames.