Signal acquisition methods and apparatus in wireless communication systems
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H03K-009/00
H04L-027/00
출원번호
US-0622585
(2007-01-12)
등록번호
US-8139680
(2012-03-20)
발명자
/ 주소
Kleider, John Eric
Arneson, Steve Henry
Chuprun, J. Scott
Nolan, Keith Matthew
Hughes, Derrick Duane
출원인 / 주소
General Dynamics C4 Systems, Inc.
대리인 / 주소
Ingrassia Fisher & Lorenz, P.C.
인용정보
피인용 횟수 :
3인용 특허 :
105
초록▼
In an embodiment, a receiver includes an antenna configured to receive a communication frame. The communication frame may include an acquisition code symbol sequence, which in turn may include a plurality of acquisition code symbols. In an embodiment, an acquisition code symbol includes a subcode se
In an embodiment, a receiver includes an antenna configured to receive a communication frame. The communication frame may include an acquisition code symbol sequence, which in turn may include a plurality of acquisition code symbols. In an embodiment, an acquisition code symbol includes a subcode sequence having a plurality of subcodes. A receiver also may include a correlation calculator coupled to the antenna. The correlation calculator may be configured to determine a correlation between the subcodes of the received communication frame and a stored version of the subcodes. The correlation may be used in determining a timing offset for further processing of the communication frame.
대표청구항▼
1. An apparatus to receive a communication frame, the apparatus comprising: an antenna configured to receive the communication frame, wherein the communication frame includes an acquisition code symbol sequence, and wherein the acquisition code symbol sequence includes a plurality of acquisition cod
1. An apparatus to receive a communication frame, the apparatus comprising: an antenna configured to receive the communication frame, wherein the communication frame includes an acquisition code symbol sequence, and wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein at least one of the acquisition symbols includes a subcode sequence with a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; anda correlation calculator configured to calculate a matched filter correlation between the plurality of subcodes of the communication frame and a stored version of the plurality of subcodes, resulting in a correlation calculator output, wherein the correlation calculator is also configured to determine a timing offset for further processing of the communication frame. 2. The apparatus of clam 1, wherein a phase of the correlation calculator output provides an estimate of a frequency offset between a transmitter that transmitted the communication frame and the receiver. 3. The apparatus of claim 1, further comprising: a differentiator configured to determine a version of the correlation calculator output that is free from a time-varying phase rotation. 4. The apparatus of claim 1, further comprising: a subcorrelator configured to sum the correlation calculator output for each subcode of the plurality of subcodes, and to determine an overall correlation of the subcode sequence. 5. The apparatus of claim 1, wherein the correlation calculator comprises: a first fast Fourier transform calculator configured to convert the stored version of the plurality of subcodes into a first frequency domain reference signal;a second fast Fourier transform calculator configured to convert the plurality of subcodes into a second frequency domain reference signal;a multiplier coupling the first fast Fourier transform calculator and the second fast Fourier transform calculator, wherein the multiplier is configured to multiply the first frequency domain reference signal and the second frequency domain reference signal to produce a multiplier output; andan inverse fast Fourier transform calculator configured to determine a time domain correlation for the multiplier output. 6. The apparatus of claim 5, wherein an overlap and save process is used to calculate the time domain correlation. 7. The apparatus of claim 5, wherein an overlap and add process is used to calculate the time domain correlation. 8. The apparatus of claim 5, wherein the correlation calculator further comprises: a buffer coupled to the second fast Fourier transform calculator, wherein the buffer is to store the acquisition code symbol sequence with a one-subcode delayed version of the acquisition code symbol sequence, and wherein the buffer includes a plurality of rows, wherein a first row includes the acquisition code symbol sequence, and a second row includes the delayed version of the acquisition code symbol sequence. 9. A method for acquiring an acquisition code symbol sequence transmitted in a communication frame, the method comprising: receiving the acquisition code symbol sequence, wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein an acquisition code symbol includes a subcode sequence having a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; andcalculating a correlation between the plurality of subcodes and a stored version of the plurality of subcodes, to produce a correlation calculator output. 10. The method of claim 9, further comprising: generating a version of the correlation calculator output that is free of a time-varying phase rotation. 11. The method of claim 9, wherein calculating the correlation comprises: summing a subcode correlation for each subcode of the plurality of subcodes to determine the correlation for the subcode sequence. 12. The method of claim 11, wherein calculating the correlation comprises: converting the stored version into a frequency domain reference using a first fast Fourier transform;converting the plurality of subcodes into a frequency domain acquisition sequence using a second fast Fourier transform;multiplying the frequency domain reference and the frequency domain acquisition sequence, to produce a multiplier output; andinverting the multiplier output using an inverse fast Fourier transform calculator to calculate the correlation. 13. The method of claim 12, further comprising: storing the plurality of subcodes and a one-subcode delayed version of subcodes to a buffer that includes a plurality of columns, wherein a first entry in a column includes a subcode of the acquisition sequence and a second entry in the column includes a delayed version of the subcode. 14. The method of claim 9, wherein calculating the correlation further comprises: using an overlap and save method to calculate the correlation. 15. The method of claim 9, wherein calculating the correlation further comprises: using an overlap and add method to calculate the correlation. 16. The method of claim 9, further comprising: determining a frequency offset between a transmitter that transmitted the acquisition sequence and a receiver that received the acquisition sequence using a phase of a peak of the correlation. 17. A method for acquiring an acquisition code symbol sequence transmitted in a communication frame, the method comprising: receiving the acquisition code symbol sequence, wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein an acquisition code symbol includes a subcode sequence;splitting the acquisition code symbol sequence into a plurality of subcodes, wherein each subcode of the plurality of subcodes is identical; andcalculating a matched filter correlation between the plurality of subcodes and a stored version of the plurality of subcodes.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (105)
Dent Paul W. (Stehags SEX), A cellular/satellite communications system with generation of a plurality of sets of intersecting antenna beams.
Rakib Selim Shlomo ; Azenkot Yehuda, Apparatus and method for SCDMA digital data transmission using orthogonal codes and a head end modem with no tracking loops.
Gelvin, David C.; Girod, Lewis D.; Kaiser, William J.; Merrill, William M.; Newberg, Fredric; Pottie, Gregory J.; Sipos, Anton I.; Vardhan, Sandeep, Apparatus for internetworked hybrid wireless integrated network sensors (WINS).
Nicholson David J. (Ottawa CAX) Ellis Donald R. (Ottawa CAX) Mills John B. (Kanata CAX) DiPerna Dino C. (Kanata CAX) Martin David W. (Nepean CAX) Peng Wang-Hsin (Ottawa CAX) Roberts Kim B. (Kanata CA, Communications system with a single protection loop.
Isaksson, Mikael; Johansson, Magnus; Tonvall, Harry; Olsson, Lennart; Stefansson, Tomas; Ohman, Hans; Bahlenberg, Gunnar; Isaksson, Anders; Okvist, Goran; Ljunggren, Lis-Marie; Nordstrom, Tomas; Isak, Data transmission system and method using nQAM constellation with a control channel superimposed on a user data channel.
Rompaey Karl Van,BEX ; Verkest Diederik,BEX ; Vanhoof Jan,BEX ; Lin Bill,BEX ; Bolsens Ivo,BEX ; De Man Hugo,BEX, Design environment and a design method for hardware/software co-design.
Naden, Gary A.; Rouquette, Robert E.; Reiser, Dale E., Direct sequence spread spectrum method computer-based product apparatus and system tolerant to frequency reference offset.
Naden Gary A. ; Rouquette Robert E. ; Sanderford ; Jr. H. Britton ; Reiser Dale E. ; Hwang Charles A. ; Reed Marc L., Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset.
George Edward Possin ; Robert Forrest Kwasnick ; Ching-Yeu Wei ; Douglas Albagli, Imager with reduced FET photoresponse and high integrity contact via.
Fuhrmann Amir Michael ; Rakib Selim Shlomo ; Azenkot Yehuda, Lower overhead method for data transmission using ATM and SCDMA over hybrid fiber coax cable plant.
Durrant Randolph L. (Colorado Springs CO) Burbach Mark T. (Peyton CO) Hoyt Eugene P. (Colorado Springs CO), Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuo.
Gelvin, David C.; Girod, Lewis D.; Kaiser, William J.; Merrill, William M.; Newberg, Fredric; Pottie, Gregory J.; Sipos, Anton I.; Vardhan, Sandeep, Method and apparatus for distributed signal processing among internetworked wireless integrated network sensors (WINS).
Gelvin, David C.; Girod, Lewis D.; Kaiser, William J.; Merrill, William M.; Newberg, Fredric; Pottie, Gregory J.; Sipos, Anton I.; Vardhan, Sandeep, Method and apparatus for internetworked wireless integrated network sensor (WINS) nodes.
Durrant Randolph L. (Colorado Springs CO) Burbach Mark (Peyton CO), Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal.
Durrant Randolph L. (Colorado Springs CO) Burbach Mark (Peyton CO), Method and apparatus for receiving and despreading a continuous phase-modulated spread spectrum signal using self-synchr.
Durrant Randolph L. (Colorado Springs CO) Burbach Mark (Peyton CO), Method and apparatus for reception and noncoherent serial correlation of a continuous phase modulated signal.
Peirce Kenneth L. ; Calhoun Patrick ; Harper Matthew H. ; Schoo Daniel L. ; Vakil Sumit, Method and system for coordination and control of data streams that terminate at different termination units using virtual tunneling.
Gelvin, David C.; Girod, Lewis D.; Kaiser, William J.; Merrill, William M.; Newberg, Fredric; Pottie, Gregory J.; Sipos, Anton I.; Vardhan, Sandeep, Method for collecting data using compact internetworked wireless integrated network sensors (WINS).
Bagchi, Amit G.; Ojard, Eric; Ptasinski, Henry S.; Trachewsky, Jason Alexander, Method for selecting frame encoding parameters to improve transmission performance in a frame-based communications network.
Trachewsky, Jason Alexander; Ojard, Eric; Garlapati, Srinivasa; Corry, Alan, Method of determining an end of a transmitted frame in a frame-based communications network.
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.
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.
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.
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.
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.
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.
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.
Corrigan, III, John E.; Kay, Stanley E.; Wending, Daniel R.; Lohman, Mike S.; Muhammad, Tariq, Multi-transport mode radio communications having synchronous and asynchronous transport mode capability.
Durrant Randolph L. ; Burbach Mark T. ; Jensen Ryan N. ; Scott Logan ; Williams Claude M., Non-coherent spread-spectrum continuous-phase modulation communication system.
Philips Lieven,BEX ; Vanhoof Jan,BEX ; Wouters Maryse,BEX ; De Wulf Rik,BEX ; Derudder Veerle,BEX ; Himbeeck Carl Van,BEX ; Bolsens Ivo,BEX ; De Man Hugo,BEX ; Gyselinckx Bert,BEX, Programmable modem apparatus for transmitting and receiving digital data, design method and use method for said modem.
Philips Lieven,BEX ; Vanhoof Jan,BEX ; Wouters Maryse,BEX ; De Wulf Rik,BEX ; Derudder Veerle,BEX ; Van Himbeeck Carl,BEX ; Bolsens Ivo,BEX ; De Man Hugo,BEX ; Gyselinckx Bert,BEX, Programmable modem apparatus for transmitting and receiving digital data, design method and use method for the modem.
Philips, Lieven; Vanhoof, Jan; Wouters, Maryse; De Wulf, Rik; Derudder, Veerle; Van Himbeeck, Carl; Bolsens, Ivo; De Man, Hugo; Gyselinckx, Bert, Programmable modem apparatus for transmitting and receiving digital data, design method and use method for the modem.
Groath, Steve G.; Miller, Myke L.; Sachse, Christopher; Bloom, Jeremy D.; Turkson, Leslie T.; Lund, Timothy; Beskar, Patrick J., Providing an integrated service assurance environment for a network.
Keevill, Peter A; Alam, Dawood; Nolan, John M.; Collins, Matthew J; Foxcroft, Thomas; Davies, David H.; Parker, Jonathan, Single chip VLSI implementation of a digital receiver employing orthogonal frequency division multiplexing.
Kotov, Anatoli V.; Khaleghi, Farideh; Secord, Norman, Synchronization channel with cyclic hierarchical sequences and method for cell site search with low detector complexity.
Kumar Balachandran ; Rajaram Ramesh ; Havish Koorapaty ; Eric Wang ; Sandeep Chennakeshu ; Amer Hassan, System and method for coding in a telecommunications environment using orthogonal and near-orthogonal codes.
Coffee, John R.; Rudow, Richard W.; Allen, Robert F.; Billings, Mark; Dye, David A.; Kirchner, Mark L.; Lewis, Robert W.; Marvin, Kevin M.; Sleeper, Robert D.; Tekniepe, William A., Vehicle tracking, communication and fleet management system.
Coffee, John R.; Rudow, Richard W.; Allen, Robert F.; Billings, Mark; Dye, David A.; Kirchner, Mark L.; Lewis, Robert W.; Marvin, Kevin M.; Sleeper, Robert D.; Tekniepe, William A., Vehicle tracking, communication and fleet management system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.