Channel estimation for low-overhead communication in a network
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-027/28
H04L-005/00
H04L-012/413
H04B-001/7097
출원번호
US-0038346
(2013-09-26)
등록번호
US-9001909
(2015-04-07)
발명자
/ 주소
Yonge, III, Lawrence Winston
Afkhami, Hassan Kaywan
Avudainayagam, Arun
출원인 / 주소
QUALCOMM Incorporated
대리인 / 주소
DeLizio Gilliam, PLLC
인용정보
피인용 횟수 :
2인용 특허 :
211
초록▼
A receiving station receives an orthogonal frequency division multiplexing (OFDM) symbol via a shared medium, the OFDM symbol comprising a first set of frequency components modulated with preamble information and a second set of frequency components modulated with information. The receiving station
A receiving station receives an orthogonal frequency division multiplexing (OFDM) symbol via a shared medium, the OFDM symbol comprising a first set of frequency components modulated with preamble information and a second set of frequency components modulated with information. The receiving station processes sampled values of the received OFDM symbol based on channel characteristics estimated from the first set of frequency components to decode information encoded on a first subset of the second set of frequency components. The receiving station processes sampled values from the first symbol based on channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode information encoded on a second subset of the second set of frequency components.
대표청구항▼
1. A system for communicating over a shared medium, the system comprising: a processor; andmemory haying instructions stored therein which, when executed by the processor, cause the processor to: receive a first orthogonal frequency division multiplexing (OFDM) symbol via the shared medium, the firs
1. A system for communicating over a shared medium, the system comprising: a processor; andmemory haying instructions stored therein which, when executed by the processor, cause the processor to: receive a first orthogonal frequency division multiplexing (OFDM) symbol via the shared medium, the first OFDM symbol comprising at least a first set of frequency components modulated with preamble information and a second set of frequency components modulated with non-preamble information,sample values of the first OFDM symbol starting at a time associated with a time slot boundary,process the sampled values based, at least in part, on first channel characteristics estimated from the first set of frequency components to decode the non-preamble information encoded on a first subset of the second set of frequency components, andprocess the sampled values based, at least in part, on second channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode the non-preamble information encoded on a second subset of the second set of frequency components. 2. The system of claim 1, wherein the first subset of the second set of frequency components includes frequency components modulated with frame control information. 3. The system of claim 2, wherein the instructions, when executed by the processor, cause the processor to estimate the second channel characteristics based, at least in part, on decoding the frame control information and re-encoding the frame control information to determine a transmitted state of the first subset of the second set of frequency components. 4. The system of claim 3, wherein the instructions, when executed by the processor, cause the processor to compute a channel characteristics matrix of a plurality of channels between antennas of a transmitting station and antennas of a receiving station using the preamble information and the frame control information. 5. The system of claim 4, wherein the instructions, when executed by the processor, cause the processor to estimate portions of the channel characteristics matrix based, at least in part, on interpolating missing carriers and filtering the first set of frequency components. 6. The system of claim 1, wherein the second subset of the second set of frequency components includes frequency components modulated with payload information. 7. The system of claim 6, wherein the instructions, when executed by the processor, cause the processor to: receive a second OFDM symbol after receiving the first OFDM symbol, process sampled values from the second OFDM symbol based, at least in part, on third channel characteristics estimated from the first set of frequency components and the first and second subsets of the second set of frequency components to decode additional non-preamble information encoded on frequency components of the second OFDM symbol. 8. The system of claim 1, wherein the first subset of the second set of frequency components includes frequency components modulated with frame control information,wherein the second subset of the second set of frequency components includes frequency components modulated with payload information, andwherein the instructions, when executed by the processor, cause the processor to estimate third channel characteristics based, at least in part, on decoding the frame control information and the payload information and re-encoding the frame control information and the payload information to determine a transmitted state of the first and second subsets of the second set of frequency components. 9. The system of claim 1, wherein the time associated with the time slot boundary is based, at least in part, on a time offset determined from decoding a previous OFDM symbol. 10. The system of claim 1, further comprising two or more antennas. 11. The system of claim 1, wherein the first and second sets of frequency components include predetermined carrier frequencies that are integral multiples of a frequency interval determined with an inverse of a length of the first OFDM symbol. 12. A station comprising: first antenna;a symbol processing module configured to sample values of an orthogonal frequency division multiplexing (OFDM) symbol starting at a time associated with a time slot boundary, after receipt of the OFDM symbol by the station from a shared medium, the OFDM symbol comprising at least a first set of frequency components modulated with preamble information and a second set of frequency components modulated with non-preamble information; anda demodulator/decoder module configured to: process the sampled values based, at least in part, on first channel characteristics estimated from the first set of frequency components to decode the non-preamble information encoded on a first subset of the second set of frequency components, andprocess the sampled values based, at least in part, on second channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode the non-preamble information encoded on a second subset of the second set of frequency components. 13. The station of claim 12 further comprising a second antenna, wherein the symbol processing module is configured to receive the OFDM symbol via the first and second antennas. 14. The station of claim 12, wherein the demodulator/decoder module is further configured to provide estimated channel characteristics to the symbol processing module, and the symbol processing module is configured to adjust a coherent reference based, at least in part, on the estimated channel characteristics. 15. The station of claim 12, wherein the symbol processing module is configured to exclude samples of repeated signal values that occur at a beginning or an end of the OFDM symbol if the repeated signal values are the same at both the beginning and the end of the OFDM symbol in accordance with cyclic extension. 16. The station of claim 12, wherein the time associated with the time slot boundary is based, at least in part, on a time offset determined from decoding a previous OFDM symbol. 17. A method comprising: receiving, at a receiving station coupled to a shared medium, at least a first orthogonal frequency division multiplexing (OFDM) symbol via the shared medium, the first OFDM symbol comprising a first set of frequency components modulated with preamble information and a second set of frequency components modulated with non-preamble information;sampling values of the first OFDM symbol starting at a time associated with a time slot boundary;processing the sampled values based, at least in part, on first channel characteristics estimated from the first set of frequency components to decode the non-preamble information encoded on a first subset of the second set of frequency components; andprocessing the sampled values based, at least in part, on second channel characteristics estimated from the first set of frequency components and the first subset of the second set of frequency components to decode the non-preamble information encoded on a second subset of the second set of frequency components. 18. The method of claim 17, wherein the first subset of the second set of frequency components includes frequency components modulated with frame control information. 19. The method of claim 18, further comprising estimating the second channel characteristics, said estimating comprising decoding the frame control information and re-encoding the frame control information to determine a transmitted state of the first subset of the second set of frequency components. 20. The method of claim 19, further comprising computing a channel characteristics matrix of a plurality of channels between antennas of a transmitting station and antennas of the receiving station using the preamble information and the frame control information. 21. The method of claim 20, wherein said estimating further comprises estimating portions of the channel characteristics matrix based, at least in part, on interpolating missing carriers and filtering the first set of frequency components modulated with the preamble information. 22. The method of claim 18, wherein the second subset of the second set of frequency components includes frequency components modulated with payload information. 23. The method of claim 22, further comprising: receiving a second OFDM symbol after receiving the first OFDM symbol; andprocessing sampled values from the second OFDM symbol based, at least in part, on third channel characteristics estimated from the first set of frequency components and the first and second subsets of the second set of frequency components to decode additional non-preamble information encoded on frequency components of the second OFDM symbol. 24. The method of claim 23, further comprising estimating the third channel characteristics, said estimating the third channel characteristics comprising decoding the frame control information and the payload information and re-encoding the frame control information and the payload information to determine a transmitted state of the first and second subsets of the second set of frequency components. 25. The method of claim 17, further comprising excluding samples of repeated signal values that occur at a beginning or an end of the first OFDM symbol in response to determining that the repeated signal values are the same at both the beginning and the end of the first OFDM symbol in accordance with cyclic extension. 26. The method of claim 17, wherein the time associated with the time slot boundary is based, at least in part, on a time offset. 27. The method of claim 26, further comprising: deriving the time offset at least in part from sampled values corresponding to pilot carriers of the first OFDM symbol. 28. The method of claim 26, further comprising: deriving the time offset at least in part, from decoding a previous OFDM symbol. 29. The method of claim 26, further comprising: deriving the time offset from processing the first OFDM symbol using predetermined slot offsets. 30. The method of claim 26, further comprising: phase shifting all of the sampled values to compensate for the time offset. 31. The method of claim 17, wherein the first OFDM symbol has a predetermined symbol length, and wherein the first set of frequency components and the second set of frequency components are each modulated at predetermined carrier frequencies.
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Kumar Derek D., AM-compatible digital broadcasting method and system.
Ahmadi Hamid (Somers NY) Bantz David F. (Chappaqua NY) Bauchot Frederic J. (LaTourraque Saint-Jeannet NY FRX) Krishna Arvind (Briarcliff Manor NY) La Maire Richard O. (Yorktown Heights NY) Natarajan , Adaptive medium access control scheme for wireless LAN.
Takemoto Sohei (Fremont CA) Pasdera Leonard A. (San Carlos CA), Apparatus and method for encoding and decoding attribute data into error checking symbols of main data.
Zhao, Wei; Roos, David, Apparatus and method for positioning single-offset zones in a spot beam coverage area to maximize call duration in a satellite-based communications network.
Just, Michael K.; Van Oorschot, Paul, Apparatus and method for reducing transmission bandwidth and storage requirements in a cryptographic security system.
Patrick Michael W. ; Picker Dennis J. ; Perreault John A., Apparatus, method, system and system method for distributed routing in a multipoint communication system.
Vijayan Rajiv ; Odenwalder Joseph P. ; Wolf Jack K. ; Lee Chong U. ; Zehavi Ephraim,ILX, Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals.
Yonge, III, Lawrence W.; Katar, Srinivas; Kostoff, II, Stanley J.; Earnshaw, William E.; Blanchard, Bart W.; Afkhamie, Hassan Kaywan; Mashburn, Harper Brent, Channel adaptation synchronized to periodically varying channel.
Yonge, III, Lawrence W.; Katar, Srinivas; Petranovich, James E.; Riedel, Neal; Peponides, George M.; Chan, Wai Chung, Communicating in a network that includes a medium having varying transmission characteristics.
Calvignac Jean (LaGaude FRX) Dauphin Michel (Vence FRX) Lenoir Raymond (Vence FRX) Picard Jean-Louis (LaColle sur Loup FRX), Data integrity securing means.
Castelain M. Damien (Rennes FRX) Helard M. Jean-Francois (Rennes FRX) Le Floch M. Bernard (Rennes FRX) Rault M. Jean-Christophe (Rennes FRX), Device for the coherent demodulation of time-frequency interlaced digital data, with estimation of the frequency respons.
Halbert-Lassalle Roselyne (Rennes) Helard Jean-Francois (Rennes) Le Floch Bernard (Rennes FRX), Device for the transmission of digital data with at least two levels of protection and corresponding reception device.
Chouly Antoine (Paris FRX) Brajal Amrico (Villeneuve Le Roi FRX), Digital signal transmission system based on partitioning of a coded modulation with concatenated codings.
Tanaka Shigetaka (Atsugi JPX) Saito Yuichi (Hadano JPX), Digital transmission device having an error correction mode and method for shifting down a data transmission rate.
Lawrence W. Yonge, III ; Bart W. Blanchard ; Harper Brent Mashburn ; Timothy Robert Gargrave ; William Edward Lawton, Forward error correction with channel adaptation.
Fuhrmann Amir Michael ; Rakib Selim Shlomo ; Azenkot Yehuda, Lower overhead method for data transmission using ATM and SCDMA over hybrid fiber coax cable plant.
Katar, Srinivas; Yonge, III, Lawrence W.; Riedel, Neal K.; Wang, Min; Peponides, George M.; Chan, Wai Chung; Gavette, Sherman Leon; Ayyagari, Deepak, Managing contention-free time allocations in a network.
Sambamurthy Namakkal S. ; Tripathi Devendra K. ; Deb Alak K. ; Truong Linh Tien ; Kumar Praveen D., Media access control architectures and network management systems.
Yonge, III,Lawrence W.; Markwalter,Brian E.; Kostoff, II,Stanley J.; Patella,James Philip; Earnshaw,William E., Media access control protocol with priority and contention-free intervals.
Gfeller Fritz Rudolf,CHX ; Hortensius Peter Dirk ; Kam Patrick K.,CAX ; Kermani Parviz ; McKay Danny N.,CAX ; Naghshineh Mahmoud ; Olsen Claus Michael ; Rezvani Babak, Media access control protocols in a wireless communication network supporting multiple transmission rates.
Sambamurthy Namakkal S. ; Tripathi Devendra K. ; Deb Alak K. ; Truong Linh Tien ; Kumar Praveen D., Media access control receiver and network management system.
Bauchot Frederic Jacques (St. Jeannet FRX) Lefevre Frederic Bernard (Cagnes sur Mer FRX) Revardel Luc Louis (La Gaude FRX), Medium access control scheme for wireless LAN using a variable length interleaved time division frame.
Perreault John A. ; Joshi Abhay ; Kabatepe Mete ; Lloyd Lawrence W. ; Schroeder Stephen, Method and apparatus for a hybrid limited contention and polling protocol.
Sherer William P. (Sunnyvale CA) Gahan Richard A. (Wexford IEX) Hickey John F. (Tipperary IEX), Method and apparatus for avoiding packet loss on a CSMA/CD-type local area network using receive-sense-based jam signal.
Anim Appiah,Kofi D.; Williams,Richard G. C.; Batra,Anuj, Method and apparatus for channel quality metric generation within a packet-based multicarrier modulation communication system.
Shimon Muller ; Denton E. Gentry, Jr. ; Linda T. Cheng ; John E. Watkins, Method and apparatus for data re-assembly with a high performance network interface.
Stratton Gregory C. ; Brackett Charles Cameron ; Johnson Chandler A., Method and apparatus for feature configuration in remotely located ultrasound imaging system.
Schmahl Kenneth A. ; Tedone Matthew J. ; Schell John C. ; Karminsky Igor ; Chan Ray P., Method and apparatus for passing bus mastership between processors using predefined bus mastership states.
Jeffrey B. Mendelson ; K. Martin Stevenson, III ; Mowaffak T. Midani ; Marcus A. Maranhao ; Michael J. Donahue ; Jean Francois Van Kerckhove ; Wayne R. Roiger, Method and apparatus for supporting a connectionless communication protocol over an ATM network.
Ben-Michael Siman-Tov (Jerusalem ILX) Lozowick Philip P. (Jerusalem MA ILX) Hawe William (Pepperell MA) Lampson Butler (Cambridge MA), Method and apparatus for traffic congestion control in a communication network bridge device.
Yeon, Hae-Dong; Kim, Young-Hak; Chang, Jae-Hwan; Lee, Jae-Yong; Park, Min-Cheol; Seol, Ji-Yun; Kim, Tae-Gon; Kang, Jun-Kyu; Kim, In-Hyoung; Park, Yun-Sang; Song, Bong-Gee, Method and apparatus for transmitting a signal in a communication system.
Zijderhand Frans (Eindhoven NLX), Method and arrangement for channel allocation for data transmission between a main station and a plurality of substation.
Lagoutte Pierre,FRX ; Grenot Thierry,FRX, Method and device for the control of congestion in sporadic exchanges of data packets in a digital transmission network.
Pommier Daniel (Breal sous Montfort FRX) Alard Michel (Rennes FRX), Method and installation for digital communication, particularly between and toward moving vehicles.
Yonge, III, Lawrence W.; Markwalter, Brian E.; Kostoff, II, Stanley J.; Patella, James Philip; Earnshaw, William E., Method and protocol to support contention-free intervals and QoS in a CSMA network.
Logvinov,Oleg; Walvis,Dirk; Durfee,Lawrence F., Method and system for timing controlled signal transmission in a point to multipoint power line communications system.
Marturano Lawrence J. (Mount Prospect IL) Needham Michael L. (Palatine IL) Crisler Kenneth J. (Wheaton IL), Method for eliminating a receiving data unit as a source of excessive resend requests.
Le Floch Bernard (Rennes FRX) Rault Jean-Christophe (Rennes FRX) Pommier Daniel (Breal Sous Montfort FRX) Castelain Damien (Rennes FRX), Method for the broadcasting of digital data, notably for radio broadcasting at a high bit-rate towards mobile receivers,.
Helard Jean-Francois (Rennes FRX) Lemesle Jean-Michel (Rennes FRX) Halbert-Lassalle Roselyne (Rennes FRX) Le Floch Bernard (Rennes FRX), Method for the broadcasting of digital data, notably for radio broadcasting at high bit rate towards mobile receivers, w.
Rahuel Jean-Claude (Rennes FRX) Pommier Daniel (Rennes FRX), Method for the transmission of digital data in radio paging systems and corresponding radio paging receiver.
Tadhg Creedon IR; David J. Law GB; Terence D. Lockyer GB; Nigel Horspool BE, Method for transmitting multimedia packet data using a contention-resolution process.
Kaufman Charles W. (Northborough MA) Herbison B. J. (Clinton MA), Method for utilizing an encrypted key as a key identifier in a data packet in a computer network.
Cidon Israel (Haifa NC ILX) Doney Richard M. (Durham NC) Drake ; Jr. John E. (Pittsboro NC) Hervatic Elizabeth A. (Apex NC) Potter ; Jr. Kenneth H. (Raleigh NC) Tedijanto Theodore E. (Cary NC), Method of determining whether to use preempt/resume or alternate protocol for data transmission.
Bux Werner K. (Richterswil NY DEX) Dias Daniel M. (Mahopac NY) Goyal Ambuj (Amawalk NY), Method of providing priority access to a transmission communication ring.
Kaiser Stefan,DEX ; Fazel Khaled,DEX, Method of simultaneous radio transmission of digital data between a plurality of subscriber stations and a base station.
Takiyasu Yoshihiro (Higashimurayama JPX) Amada Eiichi (Tokyo JPX) Jusa Hidehiko (Higashimurayama JPX) Ishifuji Tomoaki (Tokyo JPX) Adachi Shuichi (Hadano JPX) Ishii Genichi (Hachioji JPX), Method of wireless communication between base station and mobile station and multiple access communication system.
Ruszczyk Chester A. (South Boston MA) Gun Levent (Hopkinton MA), Method, device and router for providing a contention-based reservation mechanism within a mini-slotted dynamic entry pol.
Dutta Santanu, Methods of dynamically switching return channel transmissions of time-division multiple-access (TDMA) communication systems between signalling burst transmissions and message transmissions.
Paul Marie Pierre Spruyt BE; Frank Octaaf Van der Putten BE; Peter Paul Frans Reusens BE, Modulation/demodulation of a pilot carrier, means and method to perform the modulation/demodulation.
Mikael Isaksson SE; Magnus Johansson SE; Harry Tonvall SE; Lennart Olsson SE; Tomas Stefansson SE; Hans Ohman SE; Gunnar Bahlenberg SE; Anders Isaksson SE; Goran Okvist SE; Lis-Marie Ljunggr, Multi-carrier transmission systems.
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.
Huth, Hans-Peter, Process for transmitting data packets of predefinable priority classes using ethernet from a first device to at least one other device.
Yonge, III, Lawrence W.; Markwalter, Brian E.; Kostoff, II, Stanley J.; Patella, James Philip; Earnshaw, William E., Segment bursting with priority pre-emption and reduced latency.
Gregg Thomas Anthony ; Pandey Kulwant Mundra, Speeding-up communication rates on links transferring data structures by a method of handing scatter/gather of storage b.
Gold-Gavriely, Itamar; Galperin, Noam, System and method for FFT window timing synchronization for an orthogonal frequency-division multiplexed data stream.
Perreault John A. (Hopkinton MA) Joshi Abhay (Norwood MA) Kabatepe Mete (Norwood MA) Lloyd Lawrence W. (Wrentham MA) Schroeder Stephen (Stoughton MA), System and method for hybrid contention/polling protocol collision resolution using a depth first search technique.
Fulthorp Richard J. ; Smith Dale K. ; Fulthorp David A. ; Donich Thomas G., System and method for the efficient control of a radio communications network.
Joshi Abhay ; Kabatepe Mete ; Lloyd Lawrence W. ; Perreault John A. ; Schroeder Stephen, System for determining the frequency of repetitions of polling active stations relative to the polling of inactive stations.
Yonge, III, Lawrence W.; Katar, Srinivas; Vandermey, Timothy J.; Petranovich, James E.; Riedel, Neal K.; Peponides, George M.; Gavette, Sherman Leon, Time synchronization in a network.
Fischer Michael A. (San Antonio) Cox William M. (San Antonio) Moschner John L. (San Antonio) Nuckols James H. (Houston TX), Uneven token distribution technique for token based local area network.
Gray James P. ; Onvural Raif O. ; Peyravian Mohammad, Use of marker packets for synchronization of encryption/decryption keys in a data communication network.
Watanabe,Yoshinori; Kobayashi,Hirokazu; Doi,Hiroshi, Wireless network system and communication method employing both contention mode and contention-free mode.
McKenna Daniel B. (Broomfield CO) Jochim Kenneth J. (Boulder CO) Shepard Donald N. (Lafayette CO) Bradway Kevin B. (Longmont CO), Wireless radio packet switching network.
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