Variable rate coding for forward and reverse link
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-001/00
H04W-072/08
H03M-013/03
H03M-013/00
출원번호
US-0183181
(2014-02-18)
등록번호
US-9294222
(2016-03-22)
발명자
/ 주소
Proctor, Jr., James A.
출원인 / 주소
Intel Corporation
대리인 / 주소
Blakely, Sokoloff, Taylor & Zafman LLP
인용정보
피인용 횟수 :
0인용 특허 :
73
초록▼
A technique for encoding a signal used in a digital communication system in which individual traffic channel data rates may be adapted to specific channel conditions. In particular, a forward error correction coding rate is adapted for individual channels while at the same time maintaining a fixed b
A technique for encoding a signal used in a digital communication system in which individual traffic channel data rates may be adapted to specific channel conditions. In particular, a forward error correction coding rate is adapted for individual channels while at the same time maintaining a fixed block size independent of the FEC coding rate. This allows the system data rate to adapt to the channel conditions experienced by a specific user. Thus, users experiencing good communication conditions with low multipath distortion may be allocated higher capacity, whereas users with significant multipath distortion may make use of lower rate (higher levels of coding) error codes to maintain high quality. Messages are sent from a transmitter to a receiver to inform the receiver of the coding rate implemented at any given point in time. These parameters may be adjusted independent of transmitted power level through the expedient of ensuring that size of a transmitted frame remains constant, while permitting the ability to change FEC coding rates and FEC block sizes.
대표청구항▼
1. A subscriber unit comprising: a forward error correction (FEC) encoder configured to encode a plurality of frames, each of the plurality of frames including a variable number of data bits, to include an error correction code such that a resulting number of output symbols remains fixed;a modulator
1. A subscriber unit comprising: a forward error correction (FEC) encoder configured to encode a plurality of frames, each of the plurality of frames including a variable number of data bits, to include an error correction code such that a resulting number of output symbols remains fixed;a modulator configured to modulate the output symbols;wherein the error correction code is selected based on a channel condition associated with the subscriber unit;wherein the FEC encoder is configured to produce a fixed number of output FEC symbols in each given transmitted frame;wherein the plurality of frames vary in pre-encoded bit size depending upon the error correction code selected at any given time by the FEC encoder and wherein the fixed number of output FEC symbols is produced by the FEC encoder for any error correction code selected, FEC coding rate, power level, symbol modulation type, or any combination thereof; andwherein different FEC coding rates, symbol rates, and FEC codes are assignable to each of a plurality of user channels depending on channel conditions without changing an effective transmitted power level. 2. The subscriber unit of claim 1, wherein the modulator modulates the output symbols according to a multiple-access modulation technique to produce a modulated encoded signal. 3. The subscriber unit of claim 2, further comprising: a radio frequency up-converter configured to transmit the modulated encoded signal. 4. The subscriber unit of claim 1, wherein one of the plurality of frames is selected to produce, when encoded, a desired number of output symbols in an encoded frame. 5. A subscriber unit comprising: a framer configured to receive data bits and generate frames having a predetermined length; anda forward error correction (FEC) encoder configured to encode the frames to include an error correction code, wherein a length of the encoded frame remains fixed as a number of data bits varies;wherein the FEC encoder is configured to produce a fixed number of output FEC symbols in each given transmitted frame;wherein the plurality of frames vary in pre-determined bit size depending upon the error correction code selected at any given time by the FEC encoder and wherein the fixed number of output FEC symbols is produced by the FEC encoder for any error correction code selected, FEC coding rate, power level, symbol modulation type, or any combination thereof; andwherein different FEC coding rates, symbol rates, and FEC codes are assignable to each of a plurality of user channels depending on channel conditions without changing an effective transmitted power level. 6. The subscriber unit of claim 5, further comprising: a modulator configured to modulate the encoded frames according to a multiple-access modulation technique to produce a modulated encoded signal. 7. The subscriber unit of claim 6, further comprising: a radio frequency up-converter configured to transmit the modulated encoded signal. 8. The subscriber unit of claim 5, further comprising: a processor configured to generate a coding rate signal; andthe FEC encoder encodes the frames to include the error correction code, wherein the length of the encoded frame remains fixed as the number of data bits varies based on the coding rate signal. 9. A method for encoding data, the method comprising: receiving a plurality of frames, each of the plurality of frames including a unique number of bits of data;forward error correction (FEC) encoding, by an FEC encoder, each of the plurality of frames to include a plurality of error correction codes, one error correction code for each of the plurality of frames, to produce a plurality of encoded frames such that a resulting number of encoded symbols of each of the plurality of encoded frames is the same;wherein the one error correction code is selected based on a channel condition associated with a subscriber unit;producing, via the FEC encoder, a fixed number of output FEC symbols in each given transmitted frame such that the resulting number of encoded symbols of each of the plurality of encoded frames is the same;wherein the plurality of frames vary in pre-encoded bit size depending upon the error correction code selected at any given time by the FEC encoder for each of the plurality of frames and wherein the fixed number of output FEC symbols is produced by the FEC encoder for any error correction code selected, FEC coding rate, power level, symbol modulation type, or any combination thereof; andwherein different FEC coding rates, symbol rates, and FEC codes are assignable to each of a plurality of user channels depending on channel conditions without changing an effective transmitted power level. 10. The method of claim 9, further comprising: selecting a code rate of the plurality of error correction codes such that a resulting number of encoded symbols of each of the plurality of encoded frames is the same. 11. The method of claim 9, further comprising: modulating the plurality of encoded frames to produce a modulated encoded signal. 12. The method of claim 9, further comprising: modulating the plurality of encoded frames to produce a modulated encoded signal; andtransmitting the modulated encoded frames via the modulated encoded signal. 13. The subscriber unit of claim 1, further comprising: a framer to encode the plurality of frames; andwherein the framer and FEC encoder are selected in pairs to frame and encode the plurality of frames and to produce the fixed number of output FEC symbols in each given transmitted frame. 14. The subscriber unit of claim 5, further comprising: a framer to encode the plurality of frames; andwherein the framer and FEC encoder are selected in pairs to frame and encode the plurality of frames and to produce the fixed number of output FEC symbols in each given transmitted frame. 15. The method of claim 9, further comprising: selecting a framer and the FEC encoder in pairs to frame and encode the plurality of frames and to produce the fixed number of output FEC symbols in each given transmitted frame.
Davidson Grant A. (Oakland CA), Adaptive-block-length, adaptive-transforn, and adaptive-window transform coder, decoder, and encoder/decoder for high-qu.
Kim Kap S. (Gaithersburg MD) Tisdale William R. H. (Baltimore MD) Andrews Bruce S. (Rockville MD) Nash T. Randolph (Rockville MD) Kolodgie Kathleen J. (Rockville MD) Eiserike Steven S. (Rockville MD), All digital IDMA dynamic channel allocated satellite communications system and method.
Walker Gordon K. (Escondido CA) Moroney Paul (Olivenhain CA), Automatic adjustment of receiver apparatus based on channel-bit-error-rate-affected parameter measurement.
Arnold ; Richard Fairbanks ; Dishon ; Yitzhak ; Ouchi ; Norman Ken ; Sc hor ; Marshall I., Markov processor for context encoding from given characters and for character decoding from given contexts.
Hoffmann,John E.; Nelson, Jr.,George Rodney; Riley,Daniel I.; Rouphael,Antoine J.; Proctor, Jr.,James A., Maximizing data rate by adjusting codes and code rates in CDMA system.
Paik, Woo H.; Lery, Scott A.; Heegard, Chris; Krause, Edward A.; Heller, Jerrold A., Method and apparatus for communicating digital information such as compressed video using treillis coded QAM.
Zehavi Ephraim,ILX ; Miller David S. ; LaRocca Judith, Method and apparatus for providing variable rate data in a communications system using non-orthogonal overflow channels.
Agarwal, Anil K.; Bokar, Udayan N.; Hariharan, Moorthy N.; Patankar, Shekhar V., Method and apparatus for segmentation, reassembly and inverse multiplexing of packets and ATM cells over satellite/wireless networks.
Jasper Steven C. (Hoffman Estates IL) Crisler Kenneth J. (Wheaton IL), Method for providing and selecting amongst multiple data rates in a time division multiplexed system.
Rambaud, Luc; Pitcho, Francis; Bonneville, Herve, Method for transmitting variable sized packets from an upper layer of a stack of communication protocol layers to a lower layer intended to manage fixed sized packets.
Hasegawa Makoto (Tokyo JPX) Mimura Masahiro (Tokyo JPX) Hirabayashi Hirohide (Yokohama JPX) Adachi Naoki (Kawasaki JPX) Namura Yasuaki (Yokohama JPX) Sakai Hideko (Yokohama JPX), Mobile unit identifying system and method of demodulating for the same.
Zscheile ; Jr. John W. (West-Farmington UT) Wilson Michael L. (Salt Lake City UT) Saggio Richard J. (Salt Lake City UT) Lundquist Alan E. (Salt Lake City UT), Multiple channel quadrature communication system and method.
Buchholz Dale R. (Palatine IL) Doss William K. (Lake In The Hills IL) Hamilton ; Jr. R. Lee (Palatine IL) White Richard E. (Cary IL) Robbins Karen (Lake Zurich IL), Packet delivery system.
Gorsuch Thomas E. ; Amalfitano Carlo, Protocol conversion and bandwidth reduction technique providing multiple nB+D ISDN basic rate interface links over a wireless code division multiple access communication system.
Takagi Masahiro,JPX ; Kamagata Eiji,JPX ; Kato Noriyasu,JPX, Scheme for reliable communications via radio and wire networks using transport layer connection.
Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Wheatley ; III Charles E. (Del Mar CA) Viterbi Andrew J. (La Jol, System and method for generating signal waveforms in a CDMA cellular telephone system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.