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In wireless telecommunications systems, such as wireless local area networks, a flexible, less complex, and bandwidth efficient forward error correction method can be achieved by applying a first convolutional coding scheme to the bits in a first portion of a data block and a second convolutional co

In wireless telecommunications systems, such as wireless local area networks, a flexible, less complex, and bandwidth efficient forward error correction method can be achieved by applying a first convolutional coding scheme to the bits in a first portion of a data block and a second convolutional coding scheme to the bits in a second portion of the data block, wherein the second portion of the data block may encompass a remaining portion of the data block, excluding the first portion, or the entire data block, including the first portion. While the first coding scheme employs a first code rate, the second coding scheme employs a second code rate that is higher than the first code rate. The higher rate makes it possible to incorporate the one or more tail bits into the second portion of the data block, and therefore, avoid generating any additional symbols, such as orthogonal frequency division multiplexing symbols, to exclusively modulate the tail bits.

대표청구항 ▼

In wireless telecommunications systems, such as wireless local area networks, a flexible, less complex, and bandwidth efficient forward error correction method can be achieved by applying a first convolutional coding scheme to the bits in a first portion of a data block and a second convolutional co

In wireless telecommunications systems, such as wireless local area networks, a flexible, less complex, and bandwidth efficient forward error correction method can be achieved by applying a first convolutional coding scheme to the bits in a first portion of a data block and a second convolutional coding scheme to the bits in a second portion of the data block, wherein the second portion of the data block may encompass a remaining portion of the data block, excluding the first portion, or the entire data block, including the first portion. While the first coding scheme employs a first code rate, the second coding scheme employs a second code rate that is higher than the first code rate. The higher rate makes it possible to incorporate the one or more tail bits into the second portion of the data block, and therefore, avoid generating any additional symbols, such as orthogonal frequency division multiplexing symbols, to exclusively modulate the tail bits. rality of demodulated data frames, whereupon the control element generates a request for retransmission addressed to a data source. 7. The apparatus of claim 6, wherein the control element is further configured to: detect a second plurality of demodulated data frames in the buffer, wherein the second plurality of demodulated data frames has been transmitted by the data source in response to the request for retransmission; and implement the block decoder upon the first plurality of demodulated data frames and the second plurality of demodulated data frames. 8. The apparatus of claim 7, wherein the second plurality of demodulated data frames is a subset of the first plurality of demodulated data frames. 9. The apparatus of claim 1, wherein the control element is further configured to determine if a soft metric value associated with a data frame exceeds a predetermined threshold and to implement the block decoder upon the data frame if the soft metric value exceeds the predetermined threshold. 10. The apparatus of claim 1, wherein the control element is further configured to determine if a soft metric value associated with a data frame exceeds a predetermined threshold, to replace the data frame with the erasure frame if the soft metric value exceeds the predetermined threshold, and to then implement the block decoder upon the erasure frame. 11. The apparatus of claim 1, wherein the control element is further configured to determine if a soft metric value exceeds a predetermined threshold, and if the soft metric value exceeds the predetermined threshold, then: generating a request for retransmission, wherein the request for retransmission is addressed to a data source; detecting a second plurality of demodulated data frames in the buffer, wherein the second plurality of demodulated data frames has been transmitted by the data source in response to the request for retransmission; and implementing the block decoder upon the first plurality of demodulated data frames and the second plurality of demodulated data frames. 12. The apparatus of claim 11, wherein the second plurality of demodulated data frames is a subset of the first plurality of demodulated data frames. 13. In a wireless communication system, an apparatus for receiving a plurality of encoded data frames, for decoding the plurality of encoded data frames, and for correcting errors detected in the plurality of encoded data frames, comprising: a demodulator for decoding the plurality of encoded data frames and for performing an error check upon the decoded plurality of data frames; a buffer coupled to the demodulator for storing the output of the demodulator; a block decoder coupled to the buffer, wherein the block decoder is for correcting a frame error detected in the decoded output of the demodulator; and a control element coupled to the buffer and the block decoder, wherein the control element is configured to perceive the frame error, and to selectively operate the block decoder to correct the frame error. 14. The apparatus of claim 13, wherein the control element is further for: substituting an erasure frame for a data frame containing the frame error; and operating the block decoder upon the erasure frame. 15. The apparatus of claim 13, wherein the control element uses a cyclic redundancy check to determine the presence of errors. 16. The apparatus of claim 13, wherein the control element uses a soft metric to determine the presence of errors. irst portion of each input word so as to generate corresponding encoded and parity bits from the input words. A puncturing module punctures the parity bits once for each encoded bit. A mapping circuit receives an uncoded second portion of each input word and forms an output symbol for each input word from the uncoded second portion and from the corresponding encoded and punctured parity bits.