An LDPC code encoding and modulation method and a communications apparatus are provided to resolve a problem of poor transmission performance and low transmission reliability that are caused in an existing modulation method. Under the method, an information bit sequence S.sub.b can be obtained. The S.sub.b can be encoded by using a LDPC matrix H to generate an encoded code sequence S.sub.c. The S.sub.c can be modulated to obtain a modulated symbol sequence S.sub.M. This modulation may include mapping bits in a least reliable code block in the S.sub.c to non-least reliable bit locations for constellation modulation. S.sub.M can be sent to a receive end. In this way, reliability of all symbols in the S.sub.M is relatively high and uniform. A bit error rate can be effectively reduced, so that encoding performance is improved and more reliable transmission is implemented.

A receiver for receiving data in a broadcast system includes a broadcast receiver that receives, via the broadcast system, a receiver input data stream including plural channel symbols represented by constellation points in a constellation diagram. A demodulator demodulates the channel symbols into codewords and a decoder decodes the codewords into output data words. A broadband receiver obtains redundancy data via a broadband system, the redundancy data for a channel symbol including one or more least robust bits of the channel symbol or a constellation subset identifier indicating a subset of constellation points including the constellation point representing the channel symbol. The demodulator and/or the decoder is configured to use the redundancy data to demodulate the respective channel symbol and to decode the respective codeword, respectively.

An adaptive downlink control channel structure is provided to enable a transmitter to switch between forward error correction codes that use either Chase combining or incremental redundancy hybrid automatic repeat request (HARQ) techniques. Chase combining HARQ can be more efficient for forward error correction codes that use higher code rates, while incremental redundancy can be more effective for forward error correction codes that use lower code rates. The transmitter will also selectively comprise the redundancy version indicator bits depending on the HARQ method selected, which can reduce the sizes of the transport blocks when not using incremental redundancy. A receiver device can also decode transport blocks and determine whether a redundancy version indicator is present based on the forward error correction code selected.

Disclosed herein are systems and methods for forward packet recovery in a communication network with constrained network bandwidth overhead. In exemplary embodiments, a target byte protection ratio is determined. Error correcting frames are dynamically generated by a first processor such that error correcting information can be generated to approximate the target byte protection ratio. The data packets and error correcting information are then transmitted across one or more communication networks to a second processor. The second processor can use the error correcting information to regenerate or replace data packets missing or corrupted in transmission across one or more communication networks.

Provided in an embodiment of the invention are a method for transmitting data, a receiving-end device, and a transmitting-end device. The method comprises: a receiving-end device receiving, on a time unit, a first part and at least one second part of data, wherein first modulation and coding processing is performed on the first part, and second modulation and coding processing is performed on the at least one second part; and the receiving-end device performing demodulation on the first part and the at least one second part. The method for transmitting data, the receiving-end device, and the transmitting-end device provided in the embodiment of the invention achieve a higher frequency spectrum efficiency, thereby realizing fast demodulation.

Disclosed herein are systems and methods for forward packet recovery in a communication network with constrained network bandwidth overhead. In exemplary embodiments, a target byte protection ratio is determined. Error correcting frames are dynamically generated by a first processor such that error correcting information can be generated to approximate the target byte protection ratio. The data packets and error correcting information are then transmitted across one or more communication networks to a second processor. The second processor can use the error correcting information to regenerate or replace data packets missing or corrupted in transmission across one or more communication networks.

A wireless communication transmitter converts the user data into static user data symbols and dynamic user data symbols. The wireless communication transmitter wirelessly transmits the dynamic user data symbols over user data resource elements and wirelessly transmits the static user data symbols over reference signal resource elements. A wireless communication receiver wirelessly receives the dynamic user data symbols over the user data resource elements and wirelessly receives the static user data symbols over the reference signal resource elements. The wireless communication receiver determines a wireless channel status condition based on the static user data symbols received over the reference signal resource elements. The wireless communication receiver generates a user data block including the user data from the dynamic user data symbols and the static user data symbols.

A method for encoding may include receiving, at an encoder, a series of data bits, performing, at the encoder, first transition encoding on the data bits to generate an encoded series of data bits based on a key, performing, at the encoder, protection encoding on the key to generate key protection data, performing, at the encoder, second transition encoding on the key protection data to generate encoded key protection data, and transmitting an encoded series of transmission bits to a receiver, the encoded series of transmission bits including the encoded series of data bits and the encoded key protection data.

Various aspects of the present disclosure relate to video codec aware RAN configuration and unequal error protection coding. An apparatus includes a memory and a processor coupled to the memory that is configured to cause the apparatus to detect a video coded traffic stream and a video codec profile for encoding the video coded traffic stream, determine an awareness of PDU sets of the video coded traffic stream, align, based on at least the awareness of PDU sets, each PDU set of the video coded traffic stream to PHY transport elements and channel coding element partitions for a video coded traffic aware PHY transport, determine a channel coding rate allocation of the channel coding element partitions based on the video coded traffic aware PHY transport, and apply a FEC coding to the channel coding element partitions based in part on the channel coding rate allocation.

A method (100) performed by a transmitter for performing a transmission to a receiver in a wireless communication network is provided. The method (100) comprises determining (110) a first set and a second set of coding and/or modulation parameters, and transmitting (120) information to the receiver at least about the determined first set of coding and/or modulation parameters. The method (100) further comprises transmitting (130) a transmission comprising a first set of code blocks, which have been encoded and/or modulated using the first set of coding and/or modulation parameters and a second set of code blocks, which have been encoded and/or modulated using the second set of coding and/or modulation parameters.