KR101110438B1 - 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 - Google Patents
기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
- H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
Abstract
Description
도 2는 OFDM ISI 문제를 해결하기 위해 각 IFFT 블럭의 일부가 프리픽스로 복사되는 공지된 접근법의 개념도.
도 3은 0 패딩된 프리픽스가 이용되는 ISI 문제를 해결하기 위한 다른 종래의 방법의 개념도.
도 4는 각 IFFT 블럭 앞에 일반화된 프리픽스가 이용되는 본 발명의 일실시예의 개념도.
도 5는 두 개의 일반화된 프리픽스 옵션을 도시하는 도면.
도 6은 셋 이상의 일반화된 프리픽스 구조 옵션을 도시하는 도면.
도 7은 일반화된 프리픽스를 이용하는 본 발명의 다양한 실시예에서 프레임/슬롯 타이밍, 샘플링 주파수 및 시간 윈도우(time windowing)가 이용될 수 있는 방법을 도시하는 도면.
도 8은 일반화된 프리픽스를 이용하는 시스템 내의 수신기에서 시간 주파수 터보 채널 추정이 이용될 수 있는 방법을 도시하는 흐름도.
도 9는 송신기에서 일반화된 프리픽스를 채용한 시스템에서 시간 영역의 최소 평균 제곱 기반의 채널 추정이 이용될 수 있는 방법을 도시하는 도면.
도 10은 역컨볼루션 정리를 위한 부호를 정의할 목적으로 송신기 출력 및 수신기 입력을 도시하는 도면.
도 11은 터보 일반화 프리픽스 제거의 일례의 방법의 흐름도.
도 12는 일반화된 프리픽스를 이용하는 시스템의 수신기에서 일반 수신 절차의 흐름도.
도 13은 1xEV/DO 순방향 링크 상에서 사용하기 위해 적응화된 제1 시스템 실시예를 도시하는 도면.
도 14는 일례의 GP 채널 구조의 블럭도.
도 15는 1xEV/DO 순방향 링크가 MIMO 응용예로 확장된 제2 시스템 실시예를 도시하는 도면.
도 16은 일반화된 프리픽스가 스케쥴링에서 1xEV/DO 순방향 링크 및 기존 IS-856 규격과의 역방향 호환성의 관계로 이용되는 제3 시스템 실시예를 도시하는 도면.
도 17은 가변 확산 인수 CDMA 및 OFDM 다중화를 포함하는 제4 시스템 실시예를 도시하는 도면.
도 18은 일반화된 프리픽스가 1xEV/DO 역방향 링크에 이용된 제5 시스템 실시예를 도시하는 도면.
도 19는 기존 IS-856 전력 제어 CDMA 규격과 역방향으로 호환적인 다른 시스템 실시예를 도시하는 도면.
도 20은 GSM/GPRS/EDGE 다운링크 오버레이를 도시하는 제7 시스템 실시예를 도시하는 도면.
도 21은 UMTS 다운링크가 OFDM 오버레이를 포함하도록 변형된 제8 시스템 실시예를 도시하는 도면.
도 22 및 23은 도 21의 실시예를 더 상세하게 도시하는 도면.
도 24는 가변 GP 및/또는 블라인드 GP 검출을 하는 IEEE-802.11 a/g 시스템을 도시하는 제9 시스템 실시예를 도시하는 도면.
도 25는 IEEE 802.16a 시스템에 이용할 수 있는 제10 시스템 실시예를 도시하는 도면.
Claims (1)
- 수신기에서 수신된 OFDM 심볼에 대해 선형 컨볼루션에서 순환 컨볼루션으로 변환하는 방법으로서,
로서 (L-1)×(L-1) 행렬 U 및 W를 각각 정의하는 단계와,
로서 샘플의 새로운 세트 y(0), y(1), ..., y(L-2)를 정의하는 단계를 포함하고,
여기서, h(.)는 이산화된 채널 응답이고, a(.)는 상기 OFDM 심볼 앞의 비 OFDM 기간에 대한 기지의 값 또는 미지의 고 신뢰성의 값이고, b(.)는 상기 OFDM 심볼 뒤의 비 OFDM 기간에 대한 기지의 값 또는 미지의 고 신뢰성의 값이고, z(.)는 상기 OFDM 심볼 뒤의 비 OFDM 기간에 대한 수신 값이고, 상기 방정식 우측의 y(.)는 상기 OFDM 심볼의 수신 샘플들이고, 상기 방정식 좌측의 y(.)는 수신 샘플들의 새로운 세트이고, L은 이산화된 채널 응답에서의 샘플들의 수인 방법.
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US49300403P | 2003-08-07 | 2003-08-07 | |
US60/493,004 | 2003-08-07 | ||
US10/662,465 | 2003-09-16 | ||
US10/662,465 US7969857B2 (en) | 2003-08-07 | 2003-09-16 | OFDM system and method employing OFDM symbols with known or information-containing prefixes |
PCT/CA2004/001445 WO2005015796A1 (en) | 2003-08-07 | 2004-08-04 | Ofdm system and method employing ofdm symbols with known or information-containing prefixes |
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KR1020067002564A Division KR20060070538A (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는ofdm 심볼을 채용한 ofdm 시스템 및 방법 |
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KR1020117022537A Division KR101290949B1 (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 |
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KR20110056335A KR20110056335A (ko) | 2011-05-26 |
KR101110438B1 true KR101110438B1 (ko) | 2012-02-24 |
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KR1020117022537A KR101290949B1 (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 |
KR1020117009460A KR101110438B1 (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 |
KR1020137018536A KR101349627B1 (ko) | 2003-08-07 | 2004-08-04 | 수신기 및 수신기 동작 방법 |
KR1020127030863A KR101350180B1 (ko) | 2003-08-07 | 2004-08-04 | 수신기 및 수신기 동작 방법 |
KR1020067002564A KR20060070538A (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는ofdm 심볼을 채용한 ofdm 시스템 및 방법 |
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KR1020117022537A KR101290949B1 (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는 ofdm 심볼을 채용한 ofdm 방법 |
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KR1020137018536A KR101349627B1 (ko) | 2003-08-07 | 2004-08-04 | 수신기 및 수신기 동작 방법 |
KR1020127030863A KR101350180B1 (ko) | 2003-08-07 | 2004-08-04 | 수신기 및 수신기 동작 방법 |
KR1020067002564A KR20060070538A (ko) | 2003-08-07 | 2004-08-04 | 기지의 프리픽스 또는 정보를 포함하는 프리픽스를 갖는ofdm 심볼을 채용한 ofdm 시스템 및 방법 |
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US (5) | US7969857B2 (ko) |
KR (5) | KR101290949B1 (ko) |
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WO (1) | WO2005015796A1 (ko) |
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WO2005015796A1 (en) | 2005-02-17 |
US20110216786A1 (en) | 2011-09-08 |
KR20130004523A (ko) | 2013-01-10 |
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US9705725B2 (en) | 2017-07-11 |
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