Wireless mobile communication system without pilot signals
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0922896
(2006-08-10)
|
등록번호 |
US7986740
(2011-07-12)
|
우선권정보 |
IL-2005-70375(2005-08-18) |
국제출원번호 |
PCT/IL2006/000926
(2006-08-10)
|
§371/§102 date |
20071226
(20071226)
|
국제공개번호 |
WO07/020626
(2007-02-22)
|
발명자
/ 주소 |
- Bank, Michael
- Hill, Boris
- Bank, Miriam
- Hill Selecter, Hanit
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
Method and system for allowing abandoning pilot signals use and for increasing the immunity to Doppler Effect influence in OFDMA based wireless mobile communication systems and as a result, make them more efficient. This is carried out by transmitting N orthogonal I and Q values of symbols, N times
Method and system for allowing abandoning pilot signals use and for increasing the immunity to Doppler Effect influence in OFDMA based wireless mobile communication systems and as a result, make them more efficient. This is carried out by transmitting N orthogonal I and Q values of symbols, N times on N frequencies, where N is a power of two. In order to be able to select the desired signal from a mixture of N signals, signs of symbol of each signal vary according to one of N-order Walsh functions.
대표청구항
▼
The invention claimed is: 1. A method for canceling a Doppler shift, multi-path propagation, delays, and long time selective fading influences of phase and/or amplitude modulated signals carried by Radio Frequency (RF) sub-carriers, without requirement of pilot signals, comprising:a) determining the
The invention claimed is: 1. A method for canceling a Doppler shift, multi-path propagation, delays, and long time selective fading influences of phase and/or amplitude modulated signals carried by Radio Frequency (RF) sub-carriers, without requirement of pilot signals, comprising:a) determining the number of m=2n (n=1, 2, . . . ,) orthogonal sub-carriers f1, f2, . . . , fm, over which individual datum is transmitted in each communication channel;b) selecting pairs of Walsh functions from an m×m Walsh-Hadamard matrix, wherein each function is not selected more than once;c) partitioning each said signal to its I factor and Q factor whereas I=A sin φ of said signal and whereas Q =A cos φ of said signal, and coding each said I and Q factors of said signals by said pair functions;d) for each sub-carrier fi (i=1, 2, . . . ,m), allocating a corresponding phase φi and amplitude Ai, wherein the value of φi and the value of Ai are determined by the data that is transmitted, a digital modulation scheme or inverse spectral transformation, and signs of both corresponding elements taken from said pair Walsh functions;e) transmitting data with said corresponding phases and amplitudes over said sub-carriers;f) receiving all transmissions carried by said sub-carriers and obtaining the corresponding phases and amplitudes of all the received signals at frequency fi using spectral transformation;g) decoding said received signals by changing signs of I and Q factors of said received signals in accordance with corresponding elements from said pair functions used to decode said signals;h) separately summing the I and Q factors of received signals after changing signs of said I and Q factors of received signals, and dividing each of the summations of I and Q factors by m; andi) reconstructing said signal, using said divided I and Q factors, by calculating its phase whereas
이 특허에 인용된 특허 (4)
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Hadad,Zion, Bi-directional communication channel.
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Ling Fuyun (Hoffman Estates IL) Sexton Thomas A. (Schaumburg IL) Bruckert Gene (Arlington Heights IL), Method and apparatus for coherent communication reception in a spread-spectrum communication system.
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Zehavi Ephraim (Haifa ILX) Carter Stephen S. (San Diego CA) Gilhousen Klein S. (Bozeman MT), Method and apparatus for using full spectrum transmitted power in a spread spectrum communication system for tracking in.
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Skinner ; deceased Gordon (late of Boulder CO by Margo Boodakian ; legal representative ) Harms Brian (Superior CO), Signal acquisition in a multi-user communication system using multiple walsh channels.
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