37 results about "Forward error control" patented technology

A data communication system comprises a forward error correction (FEC) module, a first transceiver, a second transceiver, and logic. The FEC module is configured to receive data and to define FEC code words based on the received data. The first transceiver is coupled to a first communication line, and the second transceiver is coupled to a second communication line. The logic is configured to selectively enable the FEC module to implement a desired FEC scheme based on an estimated error rate associated with the first communication line and an estimated error rate associated with the second communication line.

A transmitter uses an adaptive forward error control scheme that includes redundant packets to reduce packet error rate at a receiver. The receiver analyzes the received packet error rate before correction to determine an optimal level of redundancy required to respect a maximum tolerated packet error rate after correction, and communicates this determined optimal level to the transmitter for controlling the amount of redundancy in subsequent transmissions from the transmitter.

Methods for checking available bandwidth using forward error correction are provided, the methods comprising: identifying data to be transmitted; determining an amount of forward error correction data to be sent to a receiver; creating the forward error correction data based on corresponding data in the data to be transmitted; transmitting to the receiver the forward error correction data and the corresponding data in the data to be transmitted; determining an error level in at least one of the corresponding data and the forward error correction data; and when the error level is below a value, increasing the amount of bandwidth used in a transmission to the receiver of other data in the data to be transmitted over the amount of bandwidth used in the transmission to the receiver of the corresponding data and decreasing the amount of bandwidth used for forward error correction data in the transmission of the other data.

A system, method and computer-readable medium for encoding and decoding digital information over a channel is provided. Type Mapping is employed and is based on the partitioning of vectors over an alphabet into “types” and using enumeration for the encoding and decoding process. Type mapping allows for signal alphabets of arbitrary size and date rate flexible coding. Tradeoffs between optimal rate versus Signal to Noise Ratio are provided and works as a compliment to the Forward Error Control that may be employed in communications products.

A system and method for providing error control coding for backhaul applications are disclosed. Data is first encoded using Reed-Solomon (RS) coding. The output RS blocks are then turbo coded. The size of the output RS blocks is selected to match the input of the turbo encoder. The bits from the RS blocks may be interleaved to create the input turbo blocks. Cyclic Redundancy Check (CRC) parity bits may be added to the data prior to RS coding.

The invention applies to packet transmission networks. It proposes an adaptive forward error control scheme implemented at the application level, allowing to respect a maximum tolerated packet error rate. According to the invention, the amount of redundancy is adapted so as to offer a correction capability allowing to respect said maximum tolerated packet error rate. Advantageously, the maximum tolerated packet error rate is set by the application.

There are provided a customer premise equipment (CPE) device, a corresponding method, and a Digital Subscriber Line Access Multiplexer (DSLAM) for connecting to a digital network and performing forward error correction (FEC). The CPE device includes a decoder for decoding one of a plurality of incremental FEC signals for media content. Each of the plurality of incremental FEC signals is for providing incrementally increasing levels of FEC for the media content.

The invention discloses an adaptive error control method for source channel coding combined optimization, which is characterized in that the source coding output code streams are classified to the following three grades according to the significance: significance, secondary significance and non-significance; and during the channel coding process, the source code streams of the three graders undergo the adaptive unequal error protection by means of variable-velocity forward error control / hybrid automatic repeat request (FEC / HARQ), so as to allow the transmission rate and the channel coding rate of the source code streams to be adjusted adaptively according to the time-varying fading characteristics of the wireless channel, thereby optimizing the transmission quality of the source code streams and improving the transmission efficiency and the channel utilization rate of the whole system. The method comprises the six steps, overcomes the problems of contradiction and resource waste caused by the independent coding of the source and the channel in the prior communication system, achieves the effect of adaptive combined optimization of the source code stream transmission rate and the channel coding rate based on the time-varying fading characteristics of channel, and has good application prospects.

The invention relates to a hardware coding method and circuit based on FEC (forward error correction) in a 10G EPON ONU (Ethernet passive optical network optical network unit). The hardware coding method comprises the following steps: S10. writing 66bit-wide data sent by a scrambler part into an fifo buffer; S20. writing the rest 65bit-wide data into nine register arrays in sequence after taking out the 66bit-wide data from the fifo buffer and removing the LSB (least significant bit) each time; S30. instantly starting a corresponding Reed-Solomon (RS) (252, 220) coder for coding once data are written into a certain register array, and then writing check bytes obtained through coding into corresponding bits of the corresponding register arrays to be registered; and S40. reading the data from the register arrays according to a certain format, thus obtaining the FEC coded data. The method and the circuit have the following advantages: the method is simple, convenient and effective and has high operability; and the circuit has a smaller scale and can achieve higher hardware circuit time sequence speed.

The invention discloses a non rate coding forward error control method suitable for dynamic long time delay channel transmission. A sending terminal adopts known time-following change distribution of channel state to estimate the coding length transmitted each time, adopts a mode of segmented finite length to accomplish nonseptate continuous non-rate coding transmission of each message packet, and is simultaneously used for controlling the sending of a forward incremental redundancy coding packet according to the two-way propagation time delay of each coding length packet. A receiving terminal accumulatively receives all coding packets of each message packet, performs non-rate decoding on all coding packets of each message packet, and feeds back ACK feedback information of the message packet to the sending terminal if decoding is successful. The method can be properly suitable for wide dynamic channel change, and simultaneously effectively avoids loss of channel resources and time slot resources brought by long time delay cannel of the traditional non rate coding transmission method.

The invention relates to a method, a device and a system for data transmission based on forward error correction (FEC). The method mainly comprises the following steps: after acquiring original data to be sent, generating corresponding data verifying information according to a predeterminated strategy on the basis of the original data to be sent and a known intercalation mark; selecting to send the data verifying information and the original data to be sent according to the predeterminated strategy; correspondingly, acquiring the original data (the original data are possibly incomplete due tothe data loss in the process of transmission) and the data verifying information from a received data packet by a receiving end; and recovering the acquired complete original data sent by a sending end according to the data verifying information and the known intercalation mark. In the embodiment of the invention, because a mode of adding the data information amount which generates the data verifying information in the sending end is adopted and the added data information is known by the sending end and the receiving end, the corresponding error recovery performance in the receiving end can be greatly improved, and the erasure capability of the FEC technology can be effectively improved further.