[특허]Bi-level framing structure for improved efficiency DSL over noisy lines

[미국특허] Bi-level framing structure for improved efficiency DSL over noisy lines 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-011/00
출원번호	US-0251723 (1999-02-17)
발명자 / 주소	Sriraman Chari Anthony J. P. O'Toole
출원인 / 주소	Centillium Communications, Inc.
대리인 / 주소	Stuart T. Auvinen
인용정보	피인용 횟수 : 40 인용 특허 : 15

초록 ▼

A bi-level framing structure for DSL phone systems uses 4 KHz physical frames and mux data frames. The mux data frames each start with a sync byte and contain user payload bytes. A group of mux data frames are appended with forward-error-correction FEC bytes to make a codeword. The codeword is then partitioned into physical 4-KHz frames. The physical frames are transformed by an inverse fast-Fourier transform (IFFT) outputting symbols at 4 KHz for transmission. For high line rates, each codeword has S mux data frames and S physical frames. There are also at least S FEC bytes if error correction is enabled. However, for lower line rates, there are S physical frames but only S/M mux data frames in each codeword. The efficiency factor M is 1 for high line rates, but 4 for lower line rates. Reducing the number of mux data frames reduces the number of sync bytes in a codeword, decreasing overhead. The FEC bytes are spread among more physical frames, reducing error-correction overhead. The symbol rate and the rate of physical frames remains at 4 KHz, even at the lower line rate. The smaller number of bytes per symbol at the lower line rates is compensated for by reducing the number of mux data frames per 4 KHz frame, allowing larger, more efficient mux data frames and error correction to be used. Thus bandwidth efficiency is increased for lower line rates.

대표청구항 ▼

1. A bi-level framer for framing data transmitted over a line at a low line rate, the bi-level framer comprising:mux-framing means, receiving user payload bytes and a sync byte, for generating mux data frames by appending Np user payload bytes to the sync byte; correction-byte means, receiving a plurality of S/M of the mux data frames from the mux-framing means, for generating a plurality of Ri forward-error correction FEC bytes; symbol-framing means, receiving the plurality of S/M mux data frames from the muxframing means and receiving the plurality of Ri FEC bytes from the correction-byte means, for generating a plurality of S symbol frames from the S/M mux data frames and the Ri FEC bytes; and a symbol generator, responsive to a system clock, for generating a symbol for transmission over the line for each symbol frame from the symbol-framing means; wherein M is an efficiency factor that is 1 when transmitting at a high line rate above the low line rate, but a positive integer greater than one when transmitting at the low line rate, whereby one symbol is transmitted for each mux data frame at the high line rate, but M symbols are transmitted for each mux data frame at the low line rate.

이 특허에 인용된 특허 (15) 인용/피인용 타임라인 분석

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Voith Raymond P. ; Sudhaman Sujit, Method and apparatus for interleaving data in an asymmetric digital subscriber line (ADSL) transmitter.
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Li Kaiping (Lawrenceville GA), Subsequent frame variable data rate indication method.
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Aihara Makoto,JPX ; Sakai Kazuaki,JPX, WACS-type mobile communication with a unified frame format.
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[미국특허] Bi-level framing structure for improved efficiency DSL over noisy lines 원문보기

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