US20120051478A1 - Fast cycle slip detection and correction - Google Patents
Fast cycle slip detection and correction Download PDFInfo
- Publication number
- US20120051478A1 US20120051478A1 US13/138,942 US201013138942A US2012051478A1 US 20120051478 A1 US20120051478 A1 US 20120051478A1 US 201013138942 A US201013138942 A US 201013138942A US 2012051478 A1 US2012051478 A1 US 2012051478A1
- Authority
- US
- United States
- Prior art keywords
- angle
- phase ambiguity
- cycle slip
- data stream
- sync
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/0062—Detection of the synchronisation error by features other than the received signal transition detection of error based on data decision error, e.g. Mueller type detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
-
- 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
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
-
- 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
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
- H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
-
- 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
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
- H04L27/2679—Decision-aided
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0053—Closed loops
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0067—Phase error detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/042—Detectors therefor, e.g. correlators, state machines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/10—Arrangements for initial synchronisation
Definitions
- the present principles relate to a method and apparatus for fast cycle slip detection and correction for improved communications in satellite systems.
- phase detector of carrier recovery circuitry has different stable points.
- MPSK Multiple Phase Shift Keying
- phase ambiguity of 2 ⁇ /M This is usually termed as “phase ambiguity of 2 ⁇ /M”.
- FEC forward error correction
- the phase estimate of the phase detector usually fluctuates around the aforementioned stable points. If the noise introduced into the carrier recovery loop passes a certain threshold, phase estimation may be pushed into neighborhood stable constellation points.
- cyclic slip This effect is called cyclic slip, which may cause errors in the FEC as the de-rotation logic needs to follow the new stable point.
- Signaling constellations typically have some degree of rotational symmetry, which provides the origin for a 2 ⁇ /M phase ambiguity.
- a QAM (Quadrature Amplitude Modulation)/QPSK (Quadrature Phase Shift Keying) constellation has fourfold symmetry, and is equally likely to lock to one of its four rotations.
- 8 PSK (8 Phase Shift Keying) has 8-fold symmetry. Since carrier recovery loops are structured with little delay to track phase noise in a system, loop errors are often derived from slicer decisions, so that any 2 ⁇ /M rotation is a viable lock point for the loop. When the correct phase is established, noise of a sufficient magnitude may push the loop from one lock point to another, since both lock points are local minima for the tracking loop.
- de-rotation logic relies on known symbols (or training symbols) to remove the phase ambiguity. Given known (training) symbols, there is only one valid rotation for the constellation. Other systems examine the error rate—if all the loops are locked, but the error rate is high, it is probable that the rotation is wrong and another rotation is used. The system will step through different rotations until a suitable rotation is reached. However, this takes time and an FEC requires a significant amount of time to begin decoding valid data, which can include hundreds or thousands of symbols, or more. However, using this traditional method, a whole block of data may be corrupted, until a point where a block with known symbols arrives at the receiver and de-rotation logic is able to rotate the constellation points to the correct phase.
- a method of detecting and correcting cycle slip and an apparatus that detects and corrects cycle slip in a data stream, including sync symbol blocks and data symbol blocks, prior to feedback carrier recovery is described.
- a phase ambiguity angle is computed upon detecting a last sync symbol of a sync symbol block in the data stream.
- a cycle slip corrector initiates cycle slip correction upon determining the computed phase ambiguity angle is different from a previous computed phase ambiguity angle to generate a corrected data stream.
- the corrected data stream is provided to a feedback carrier recovery circuit.
- the data stream may further include pilot symbol blocks. Computation of a phase ambiguity angle may be performed in response to detecting a last pilot symbol of a received pilot symbol block in the data stream.
- the phase ambiguity angle may be represented by
- phase ambiguity angle may also be represented by
- Cycle slip correction is performed by using the operation represented by r[s+i]exp ⁇ j( ⁇ circumflex over ( ⁇ ) ⁇ (k-1) ⁇ circumflex over ( ⁇ ) ⁇ (k) ) ⁇ .
- the method and apparatus described above may also be implemented in a method for detecting and correcting cycle slip and an apparatus that detects and corrects cycle slip in a data stream prior to feedforward carrier recovery.
- FIG. 1 a shows a diagram of a feed-back carrier recovery circuit for implementing cycle slip detection and correction
- FIG. 1 b shows a diagram of a feed-forward carrier recovery circuit for implementing cycle slip detection and correction implemented in ry
- FIG. 2 shows an exemplary DVB-S2 signal transmitted to the cycle slip detection and correction feed-back and feed-forward carrier recovery loops
- FIG. 3 shows a flow chart detailing the steps taken to perform cycle slip detection and correction according to present principles.
- the implementations described herein may be implemented in, for example, a method or process, an apparatus, or a software program. Even if only discussed in the context of a single form of implementation (for example, discussed only as a method), the implementation or features discussed may also be implemented in other forms (for example, an apparatus or program).
- An apparatus may be implemented in, for example, appropriate hardware, software, and firmware.
- the methods may be implemented in, for example, an apparatus such as, for example, a computer or other processing device. Additionally, the methods may be implemented by instructions being performed by a processing device or other apparatus, and such instructions may be stored on a computer readable medium such as, for example, a CD, or other computer readable storage device, or an integrated circuit. Further, a computer readable medium may store the data values produced by an implementation.
- implementations may also produce a signal formatted to carry information that may be, for example, stored or transmitted.
- the information may include, for example, instructions for performing a method, or data produced by one of the described implementations.
- the signal may take a variety of forms, including for example, the signal may be analog, digital, and the signal may be baseband or modulating a carrier frequency suitable for transmission. Further, the signal may be recorded on computer readable medium.
- implementations may be implemented in one or more of an encoder, a pre-processor to an encoder, a decoder, or a post-processor to a decoder.
- the implementations described or contemplated may be used in a variety of different applications and products.
- Some examples of applications or products include set-top boxes, cell phones, personal digital assistants (PDAs), televisions, personal recording devices (for example, PVRs, computers running recording software, VHS recording devices), camcorders, streaming of data over the Internet or other communication links, and video-on-demand.
- implementations are contemplated by this disclosure.
- additional implementations may be created by combining, deleting, modifying, or supplementing various features of the disclosed implementations.
- FIG. 1 a a diagram of the cycle slip detection and correction in feed-back carrier recovery circuitry 101 is shown.
- the received signal after the first de-rotator 103 is denoted as r[n] ( FIG. 2 ) and the corresponding received sync symbols of a DVB-S2 signal are denoted as
- phase ambiguity angle for MPSK signals is represented by
- t[i] represents the known sync symbol and has a constant amplitude denoted by A, and noise embedded in the received signal is denoted by w[i].
- the phase ambiguity angle is estimated and represented by
- phase ambiguity angle represents a symbol in a possible stable rotation for a constellation.
- Cycle slip detector/corrector 105 computes a phase ambiguity angle ⁇ circumflex over ( ⁇ ) ⁇ (k) when the sync symbols arrive and compares the current angle with a previous angle ⁇ circumflex over ( ⁇ ) ⁇ (l-1) . If the two angles are different, cycle slip detector/corrector 105 provides an indication that a cycle slip has occurred. Cycle slip correction circuitry (not shown) is then activated in order to compensate for the adverse effects of the cycle slip.
- the mathematical operation for correcting cycle slip is represented by
- Slicer 113 receives a signal and slices the signal in order to optimize the signal for further processing.
- CTL (Computation Tree Logic) 111 performs logical operations on the signal to further prepare the signal for phasing by phasor 109 .
- Phasor 109 calculates a sine wave representation of the signal.
- Phase shifter 107 shifts the sine wave to provide a time shifted delayed phase for use in cycle detection by cycle slip detector/corrector 105 .
- FIG. 1 b a diagram of the cycle slip detection and correction in feed-forward carrier recovery circuitry 151 is shown. Calculations performed using cycle slip detector/corrector 155 are identical to calculations performed in cycle slip detector/corrector 105 of FIG. 1 a .
- Slicer 163 slices the derotated signal and optimizes the signal for cycle slip detection.
- FF (feed forward) phase rotator 165 adjusts the phase of the incoming signal from cycle slip detector/corrector before sending the adjusted signal to phasor 159 that calculates a sine wave representation of the signal.
- FIGS. 1 a and 1 b are advantageous because cycle slip detection and correction are both performed before a signal reaches a carrier recovery circuit or stage. This results in a more efficient and effective way of limiting cycle slips which may cause corruption and interruption of data flow through satellite systems.
- FIG. 2 shows an exemplary DVB-S2 signal transmitted to the cycle slip detection and correction feed-back and feed-forward carrier recovery loops.
- SYNC symbols are shown as being inserted between data packets or symbols.
- cycle slip detection relies on known symbols or training symbols within a transmitted data stream for detecting phase ambiguity.
- DVB-S2 there are known sync symbols placed before data symbols or packets as shown in FIG. 2 .
- Sync symbols are used to signify that data symbols or packets follow.
- DVB-S2 signals may also contain pilot symbols, not shown in FIG. 2 , for cyclic slip detection.
- the exemplary data signal shown in FIG. 2 may be transmitted to the hardware implementations shown in FIGS. 1 a and 1 b.
- FIG. 3 A flow chart of an algorithm for cycle slip detection and correction as performed by cycle slip detector/corrector 105 and 155 is shown in FIG. 3 .
- Sync and data symbols are received after de-rotation.
- the cycle slip detector/corrector detects if the k-th block of sync symbols (or last block of sync symbols in a sync block) has arrived. If the k-th block of sync symbols has not arrived, step 301 is repeated. If the k-th block of sync symbols has arrived, step 305 is performed, in which phase ambiguity angle ⁇ circumflex over ( ⁇ ) ⁇ (k) is computed using equation (4) shown above.
- phase ambiguity angle ⁇ circumflex over ( ⁇ ) ⁇ (k) is compared with a previous phase ambiguity angle ⁇ circumflex over ( ⁇ ) ⁇ (l-1) that is stored by either the feedback or feedforward implementations shown in FIGS. 1 a and 1 b . If both angles match, then the process ends at step 311 . If both angles do not match, step 309 is performed and cycle slip correction in a known manner is initiated.
- processor or “controller” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (“DSP”) hardware, read-only memory (“ROM”) for storing software, random access memory (“RAM”), and non-volatile storage.
- DSP digital signal processor
- ROM read-only memory
- RAM random access memory
- any switches shown in the figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
- any element expressed as a means for performing a specified function is intended to encompass any way of performing that function including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function.
- the present principles as defined by such claims reside in the fact that the functionalities provided by the various recited means are combined and brought together in the manner which the claims call for. It is thus regarded that any means that can provide those functionalities are equivalent to those shown herein.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Circuits Of Receivers In General (AREA)
- Radio Relay Systems (AREA)
- Error Detection And Correction (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/138,942 US20120051478A1 (en) | 2009-05-29 | 2010-05-28 | Fast cycle slip detection and correction |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21733309P | 2009-05-29 | 2009-05-29 | |
US13/138,942 US20120051478A1 (en) | 2009-05-29 | 2010-05-28 | Fast cycle slip detection and correction |
PCT/US2010/001568 WO2010138198A1 (en) | 2009-05-29 | 2010-05-28 | Fast cycle slip detection and correction |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120051478A1 true US20120051478A1 (en) | 2012-03-01 |
Family
ID=42562722
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/138,942 Abandoned US20120051478A1 (en) | 2009-05-29 | 2010-05-28 | Fast cycle slip detection and correction |
US13/138,953 Expired - Fee Related US8792592B2 (en) | 2009-05-29 | 2010-05-28 | Feed-forward carrier recovery system and method |
US13/320,128 Expired - Fee Related US8687747B2 (en) | 2009-05-29 | 2010-05-28 | Method and apparatus for symbol timing recovery |
US13/138,923 Abandoned US20120039380A1 (en) | 2009-05-29 | 2010-05-28 | Method and apparatus for iterative timing and carrier recovery |
US13/322,167 Expired - Fee Related US8737553B2 (en) | 2009-05-29 | 2010-05-28 | Sync detection and frequency recovery for satellite systems |
Family Applications After (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/138,953 Expired - Fee Related US8792592B2 (en) | 2009-05-29 | 2010-05-28 | Feed-forward carrier recovery system and method |
US13/320,128 Expired - Fee Related US8687747B2 (en) | 2009-05-29 | 2010-05-28 | Method and apparatus for symbol timing recovery |
US13/138,923 Abandoned US20120039380A1 (en) | 2009-05-29 | 2010-05-28 | Method and apparatus for iterative timing and carrier recovery |
US13/322,167 Expired - Fee Related US8737553B2 (en) | 2009-05-29 | 2010-05-28 | Sync detection and frequency recovery for satellite systems |
Country Status (7)
Country | Link |
---|---|
US (5) | US20120051478A1 (pt) |
EP (5) | EP2436140A2 (pt) |
JP (5) | JP5730861B2 (pt) |
KR (2) | KR20120016294A (pt) |
CN (5) | CN102449968B (pt) |
BR (5) | BRPI1011213A2 (pt) |
WO (6) | WO2010138206A1 (pt) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160134449A1 (en) * | 2013-07-15 | 2016-05-12 | Huawei Technologies Co., Ltd. | Cycle-slip detection method and apparatus, and receiver |
Families Citing this family (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102460977A (zh) | 2009-05-27 | 2012-05-16 | 诺沃尔赛特有限公司 | 具有迭代调度的ldpc码迭代解码 |
US8315528B2 (en) | 2009-12-22 | 2012-11-20 | Ciena Corporation | Zero mean carrier recovery |
US20120230676A1 (en) * | 2011-03-07 | 2012-09-13 | Fan Mo | Turn-up and long term operation of adaptive equalizer in optical transmission systems |
EP2536040B1 (en) * | 2011-06-16 | 2017-01-18 | Ciena Luxembourg S.a.r.l. | Zero mean carrier recovery |
JP5983111B2 (ja) * | 2012-07-06 | 2016-08-31 | ソニー株式会社 | 受信装置および方法、並びに、プログラム |
CN103582107B (zh) * | 2012-07-19 | 2018-06-26 | 中兴通讯股份有限公司 | 一种符号定时环的输出控制方法和装置 |
US9264182B2 (en) | 2012-09-13 | 2016-02-16 | Novelsat Ltd. | Iterative receiver loop |
US8903028B2 (en) * | 2012-09-20 | 2014-12-02 | Novelsat Ltd. | Timing recovery for low roll-off factor signals |
CN105122720B (zh) * | 2013-02-21 | 2018-02-06 | 高通股份有限公司 | 用于在10gbase‑t系统中数据辅助定时恢复的方法和装置 |
US9716602B2 (en) * | 2013-07-08 | 2017-07-25 | Hughes Network Systems, Llc | System and method for iterative compensation for linear and nonlinear interference in system employing FTN symbol transmission rates |
JP2016525766A (ja) * | 2013-07-30 | 2016-08-25 | ヒューレット パッカード エンタープライズ デベロップメント エル ピーHewlett Packard Enterprise Development LP | パーシャル・レスポンス・チャネル処理 |
US9203450B2 (en) | 2013-10-08 | 2015-12-01 | Hughes Network Systems, Llc | System and method for pre distortion and iterative compensation for nonlinear distortion in system employing FTN symbol transmission rates |
EP3092755B1 (en) * | 2013-12-09 | 2018-11-14 | Telefonaktiebolaget LM Ericsson (publ) | Pre-coding in a faster-than-nyquist transmission system |
FR3020686A1 (fr) * | 2014-04-30 | 2015-11-06 | Thales Sa | Estimateur de frequence pour communication aeronautique |
JP6360354B2 (ja) | 2014-05-23 | 2018-07-18 | 国立研究開発法人海洋研究開発機構 | 受信装置および受信方法 |
US9246717B2 (en) * | 2014-06-30 | 2016-01-26 | Hughes Network Systems, Llc | Optimized receivers for faster than nyquist (FTN) transmission rates in high spectral efficiency satellite systems |
CN104104493B (zh) * | 2014-07-30 | 2017-09-08 | 南京航空航天大学 | 面向深空通信的载波同步方法及装置 |
CA3033288C (en) | 2014-08-25 | 2021-05-04 | ONE Media, LLC | Dynamic configuration of a flexible orthogonal frequency division multiplexing phy transport data frame preamble |
CN105991488B (zh) * | 2015-02-06 | 2019-04-16 | 上海无线通信研究中心 | 应用于ftn调制中的减小状态数的维特比解调方法 |
US10237096B2 (en) * | 2015-04-02 | 2019-03-19 | Telefonaktiebolaget L M Ericsson (Publ) | Processing of a faster-than-Nyquist signaling reception signal |
BR102015013039A2 (pt) * | 2015-06-03 | 2016-12-06 | Padtec S A | método de estimação de desvios de frequência e/ou fase em sistemas de comunicação digital coerente |
CN105024799B (zh) * | 2015-06-19 | 2018-04-27 | 北京遥测技术研究所 | 一种基于p阶矩的带限系统定时恢复方法 |
US20170054538A1 (en) * | 2015-08-20 | 2017-02-23 | Intel IP Corporation | Mobile terminal devices and methods of detecting reference signals |
WO2017033550A1 (ja) | 2015-08-21 | 2017-03-02 | 日本電気株式会社 | 信号処理装置、通信システム、及び信号処理方法 |
CN105515639B (zh) * | 2015-12-02 | 2018-09-25 | 中国工程物理研究院电子工程研究所 | 一种通用卫星高速数传信号定时同步方法 |
CN105717526B (zh) * | 2016-03-10 | 2017-12-19 | 中国人民解放军国防科学技术大学 | 一种基于相位误差限幅处理的载波相位周跳抑制方法 |
CN109075807B (zh) * | 2016-04-13 | 2022-06-07 | 华为技术加拿大有限公司 | 用于超奈奎斯特(ftn)传输的系统和方法 |
CN106332095A (zh) * | 2016-11-07 | 2017-01-11 | 海南大学 | 基于级联频域均衡的超奈奎斯特传输方法 |
CN106842243B (zh) * | 2016-12-21 | 2019-09-10 | 湖南北云科技有限公司 | 一种卫星导航半周跳变检测方法及装置 |
KR102519836B1 (ko) * | 2017-01-18 | 2023-04-11 | 한국전자통신연구원 | 파일럿을 포함하는 ftn 통신 시스템의 반복 간섭 제거 및 채널 추정을 위한 방법 및 장치 |
US20190036759A1 (en) * | 2017-07-28 | 2019-01-31 | Roshmere, Inc. | Timing recovery for nyquist shaped pulses |
US11108468B2 (en) | 2017-08-08 | 2021-08-31 | Nippon Telegraph And Telephone Corporation | Optical transmitter, optical receiver and communication system |
CN109842770A (zh) * | 2017-11-28 | 2019-06-04 | 晨星半导体股份有限公司 | 信号接收装置及其信号处理方法 |
CN108777670B (zh) * | 2018-05-31 | 2020-11-10 | 清华大学 | 一种帧同步方法及装置 |
CN109286589B (zh) * | 2018-10-16 | 2021-07-16 | 安徽传矽微电子有限公司 | 一种用于gfsk解调器中的频率偏移估计器及其方法 |
CN109617666B (zh) * | 2019-01-31 | 2021-03-23 | 中国电子科技集团公司第五十四研究所 | 一种适用于连续传输的前馈定时方法 |
CN110505175B (zh) * | 2019-06-05 | 2022-02-18 | 暨南大学 | 一种快速帧同步方法及帧同步装置 |
CN110445610B (zh) * | 2019-08-26 | 2021-11-30 | 上海循态量子科技有限公司 | 连续变量量子密钥分发系统的偏振追踪方法、系统及介质 |
CN110752870B (zh) * | 2019-10-29 | 2021-08-31 | 中国电子科技集团公司第五十四研究所 | 滚降系数可变宽带卫星传输系统的定时恢复方法及装置 |
US10999048B1 (en) * | 2019-12-31 | 2021-05-04 | Hughes Network Systems, Llc | Superior timing synchronization using high-order tracking loops |
US12003350B1 (en) * | 2020-02-29 | 2024-06-04 | Space Exploration Technologies Corp. | Configurable orthogonal frequency division multiplexing (OFDM) signal and transmitter and receiver for user terminal to satellite uplink communications |
CN111447003A (zh) * | 2020-03-18 | 2020-07-24 | 重庆邮电大学 | 一种dvb-s2接收机的帧同步方法 |
CN112583433B (zh) * | 2020-12-15 | 2022-03-25 | 四川灵通电讯有限公司 | 在数字接收机中进行定时恢复误差检测的装置及应用方法 |
US11930470B2 (en) * | 2021-09-17 | 2024-03-12 | Cypress Semiconductor Corporation | Systems, methods, and devices for timing recovery in wireless communications devices |
CN116436511A (zh) * | 2023-06-13 | 2023-07-14 | 武汉能钠智能装备技术股份有限公司四川省成都市分公司 | 一种卫星信号设备的自干扰对消方法及系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533072A (en) * | 1993-11-12 | 1996-07-02 | International Business Machines Corporation | Digital phase alignment and integrated multichannel transceiver employing same |
US6441691B1 (en) * | 2001-03-09 | 2002-08-27 | Ericsson Inc. | PLL cycle slip compensation |
US6973150B1 (en) * | 2001-04-24 | 2005-12-06 | Rockwell Collins | Cycle slip detection using low pass filtering |
US7522841B2 (en) * | 2005-10-21 | 2009-04-21 | Nortel Networks Limited | Efficient data transmission and training of data processing functions |
Family Cites Families (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4649543A (en) * | 1985-08-30 | 1987-03-10 | Motorola, Inc. | Synchronization sequence decoder for a digital radiotelephone system |
DK163194C (da) * | 1988-12-22 | 1992-06-22 | Radiometer As | Fremgangsmaade ved fotometrisk in vitro bestemmelse af en blodgasparameter i en blodproeve |
EP0540908B1 (en) * | 1991-11-04 | 1997-01-08 | Motorola, Inc. | Method and apparatus for automatic tuning calibration of electronically tuned filters |
EP0544358B1 (en) * | 1991-11-25 | 1995-08-16 | Koninklijke Philips Electronics N.V. | Phase locked loop with frequency deviation detector and decoder circuit comprising such a phase locked loop |
JP3003826B2 (ja) * | 1992-12-11 | 2000-01-31 | 三菱電機株式会社 | クロック再生回路 |
US5513209A (en) * | 1993-02-26 | 1996-04-30 | Holm; Gunnar | Resampling synchronizer of digitally sampled signals |
ZA955605B (en) * | 1994-07-13 | 1996-04-10 | Qualcomm Inc | System and method for simulating user interference received by subscriber units in a spread spectrum communication network |
JP3077881B2 (ja) * | 1995-03-07 | 2000-08-21 | 日本電気株式会社 | 復調方法及び復調装置 |
JP3013763B2 (ja) | 1995-08-25 | 2000-02-28 | 日本電気株式会社 | キャリア同期ユニット |
US5999355A (en) * | 1996-04-30 | 1999-12-07 | Cirrus Logic, Inc. | Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording |
US6654432B1 (en) * | 1998-06-08 | 2003-11-25 | Wireless Facilities, Inc. | Joint maximum likelihood frame and timing estimation for a digital receiver |
JPH11219199A (ja) * | 1998-01-30 | 1999-08-10 | Sony Corp | 位相検出装置及び方法、並びに音声符号化装置及び方法 |
US6647074B2 (en) * | 1998-08-25 | 2003-11-11 | Zenith Electronics Corporation | Removal of clock related artifacts from an offset QAM generated VSB signal |
US6650699B1 (en) * | 1999-01-21 | 2003-11-18 | International Business Machines Corporation | Methods and apparatus for timing recovery from a sampled and equalized data signal |
US6348826B1 (en) * | 2000-06-28 | 2002-02-19 | Intel Corporation | Digital variable-delay circuit having voltage-mixing interpolator and methods of testing input/output buffers using same |
KR100393559B1 (ko) * | 2000-09-30 | 2003-08-02 | 삼성전기주식회사 | 디지털 동적 컨버젼스 제어 방법 및 그 시스템 |
US7079574B2 (en) | 2001-01-17 | 2006-07-18 | Radiant Networks Plc | Carrier phase recovery system for adaptive burst modems and link hopping radio networks |
DE60128784T2 (de) * | 2001-02-26 | 2008-02-07 | Juniper Networks, Inc., Sunnyvale | Verfahren und Vorrichtung zur effizienten und genauen Grobzeitsynchronisierung in Pulsdemodulatoren |
GB2376855A (en) * | 2001-06-20 | 2002-12-24 | Sony Uk Ltd | Determining symbol synchronisation in an OFDM receiver in response to one of two impulse response estimates |
US6794912B2 (en) * | 2002-02-18 | 2004-09-21 | Matsushita Electric Industrial Co., Ltd. | Multi-phase clock transmission circuit and method |
US7257102B2 (en) | 2002-04-02 | 2007-08-14 | Broadcom Corporation | Carrier frequency offset estimation from preamble symbols |
US6922440B2 (en) * | 2002-12-17 | 2005-07-26 | Scintera Networks, Inc. | Adaptive signal latency control for communications systems signals |
KR100505678B1 (ko) * | 2003-03-17 | 2005-08-03 | 삼성전자주식회사 | 재차 상관과 2차 첨두치 비교로 심볼 시간을 동기화 하는무선 랜 시스템의 직교 주파수 분할 다중화 수신기 및 그심볼 동기화 방법 |
EP1513308B1 (en) | 2003-09-05 | 2007-01-03 | Agence Spatiale Europeenne | Process for pilot-aided carrier phase synchronization |
KR100518600B1 (ko) * | 2003-11-12 | 2005-10-04 | 삼성전자주식회사 | 가드 인터벌 및 고속 푸리에 변환 모드 검출기를 구비하는디지털 비디오 방송 수신기, 및 그 방법 |
CN100371731C (zh) * | 2004-06-08 | 2008-02-27 | 河海大学 | Gps和伪卫星组合定位方法 |
EP1794966B1 (en) | 2004-09-30 | 2013-05-08 | Efficient Channel Coding, Inc. | Frame-based carrier frequency and phase recovery system and method |
BRPI0419199B1 (pt) | 2004-11-16 | 2018-06-05 | Thomson Licensing | Método e aparelho para recuperação de portadora utilizando interpolação de fase com assistência |
BRPI0419205A (pt) | 2004-11-16 | 2007-12-18 | Thomson Licensing | método e aparelho para recuperação de portadora utilizando múltiplas fontes |
KR100585173B1 (ko) * | 2005-01-26 | 2006-06-02 | 삼성전자주식회사 | 반복적 프리앰블 신호를 갖는 ofdm 신호 수신 방법 |
JP4583196B2 (ja) * | 2005-02-04 | 2010-11-17 | 富士通セミコンダクター株式会社 | 通信装置 |
JP2006237819A (ja) | 2005-02-23 | 2006-09-07 | Nec Corp | 復調装置及びその位相補償方法 |
US7564931B2 (en) * | 2005-05-10 | 2009-07-21 | Seagate Technology Llc | Robust maximum-likelihood based timing recovery |
ATE424080T1 (de) * | 2005-07-01 | 2009-03-15 | Sequans Comm | Verfahren und system zur synchronisation eines teilnehmerkommunikationsgeräts mit einer basisstation eines drahtlosen kommunikationssystems |
US7176764B1 (en) * | 2005-07-21 | 2007-02-13 | Mediatek Incorporation | Phase locked loop having cycle slip detector capable of compensating for errors caused by cycle slips |
EP2439893B1 (en) * | 2005-08-22 | 2017-07-26 | Cohda Wireless Pty Ltd | Methods and devices for tracking time varying channels in a wireless network |
ES2349148T5 (es) * | 2006-01-18 | 2017-12-19 | Huawei Technologies Co., Ltd. | Método para mejorar la sincronización y la transmisión de la información en un sistema de comunicación |
CN101059560B (zh) * | 2006-04-17 | 2011-04-20 | 中国科学院空间科学与应用研究中心 | 一种检测掩星双频gps接收机观测量测量误差的方法 |
JP2008048239A (ja) | 2006-08-18 | 2008-02-28 | Nec Electronics Corp | シンボルタイミング検出方法および装置並びにプリアンブル検出方法および装置 |
JP4324886B2 (ja) * | 2007-04-27 | 2009-09-02 | ソニー株式会社 | フレーム同期装置および方法、並びに、復調装置 |
JP4359638B2 (ja) * | 2007-08-24 | 2009-11-04 | Okiセミコンダクタ株式会社 | 相関演算器及び相関演算装置 |
US7961816B2 (en) * | 2007-11-28 | 2011-06-14 | Industrial Technology Research Institute | Device for and method of signal synchronization in a communication system |
US7940861B2 (en) * | 2007-12-07 | 2011-05-10 | Advantech Advanced Microwave Technologies, Inc. | QAM phase error detector |
KR100937430B1 (ko) * | 2008-01-25 | 2010-01-18 | 엘지전자 주식회사 | 신호 송수신 방법 및 신호 송수신 장치 |
PL2351251T3 (pl) * | 2008-11-18 | 2019-04-30 | Viasat Inc | Udoskonalona mobilna komunikacja satelitarna |
KR101038855B1 (ko) * | 2008-12-04 | 2011-06-02 | 성균관대학교산학협력단 | Ofdm 시스템에서의 주파수 동기 장치 및 방법 |
-
2010
- 2010-05-28 CN CN201080023483.7A patent/CN102449968B/zh not_active Expired - Fee Related
- 2010-05-28 CN CN2010800234822A patent/CN102449949A/zh active Pending
- 2010-05-28 CN CN2010800224799A patent/CN102439928A/zh active Pending
- 2010-05-28 EP EP10727519A patent/EP2436140A2/en not_active Withdrawn
- 2010-05-28 EP EP10727522.4A patent/EP2436158B1/en not_active Not-in-force
- 2010-05-28 US US13/138,942 patent/US20120051478A1/en not_active Abandoned
- 2010-05-28 WO PCT/US2010/001578 patent/WO2010138206A1/en active Application Filing
- 2010-05-28 JP JP2012513060A patent/JP5730861B2/ja not_active Expired - Fee Related
- 2010-05-28 JP JP2012513059A patent/JP2012528523A/ja active Pending
- 2010-05-28 BR BRPI1011213A patent/BRPI1011213A2/pt not_active IP Right Cessation
- 2010-05-28 CN CN201080023576.XA patent/CN102449950B/zh not_active Expired - Fee Related
- 2010-05-28 EP EP10730582A patent/EP2436159A1/en not_active Withdrawn
- 2010-05-28 US US13/138,953 patent/US8792592B2/en not_active Expired - Fee Related
- 2010-05-28 US US13/320,128 patent/US8687747B2/en not_active Expired - Fee Related
- 2010-05-28 WO PCT/US2010/001576 patent/WO2010138204A1/en active Application Filing
- 2010-05-28 JP JP2012513057A patent/JP5646609B2/ja not_active Expired - Fee Related
- 2010-05-28 CN CN2010800237233A patent/CN102484578A/zh active Pending
- 2010-05-28 EP EP10727521A patent/EP2436138A1/en not_active Withdrawn
- 2010-05-28 JP JP2012513058A patent/JP5678040B2/ja not_active Expired - Fee Related
- 2010-05-28 US US13/138,923 patent/US20120039380A1/en not_active Abandoned
- 2010-05-28 EP EP10727520A patent/EP2436141A2/en not_active Withdrawn
- 2010-05-28 BR BRPI1012296A patent/BRPI1012296A2/pt not_active Application Discontinuation
- 2010-05-28 WO PCT/US2010/001577 patent/WO2010138205A1/en active Application Filing
- 2010-05-28 KR KR1020117031380A patent/KR20120016294A/ko not_active Application Discontinuation
- 2010-05-28 BR BRPI1011199A patent/BRPI1011199A2/pt not_active IP Right Cessation
- 2010-05-28 WO PCT/US2010/001570 patent/WO2010138199A2/en active Application Filing
- 2010-05-28 BR BRPI1011215A patent/BRPI1011215A2/pt not_active Application Discontinuation
- 2010-05-28 KR KR1020117031315A patent/KR20120028343A/ko not_active Application Discontinuation
- 2010-05-28 US US13/322,167 patent/US8737553B2/en not_active Expired - Fee Related
- 2010-05-28 BR BRPI1011995A patent/BRPI1011995A2/pt not_active IP Right Cessation
- 2010-05-28 WO PCT/US2010/001572 patent/WO2010138201A2/en active Application Filing
- 2010-05-28 WO PCT/US2010/001568 patent/WO2010138198A1/en active Application Filing
- 2010-05-28 JP JP2012513056A patent/JP2012528520A/ja not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533072A (en) * | 1993-11-12 | 1996-07-02 | International Business Machines Corporation | Digital phase alignment and integrated multichannel transceiver employing same |
US6441691B1 (en) * | 2001-03-09 | 2002-08-27 | Ericsson Inc. | PLL cycle slip compensation |
US6973150B1 (en) * | 2001-04-24 | 2005-12-06 | Rockwell Collins | Cycle slip detection using low pass filtering |
US7522841B2 (en) * | 2005-10-21 | 2009-04-21 | Nortel Networks Limited | Efficient data transmission and training of data processing functions |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160134449A1 (en) * | 2013-07-15 | 2016-05-12 | Huawei Technologies Co., Ltd. | Cycle-slip detection method and apparatus, and receiver |
US9521022B2 (en) * | 2013-07-15 | 2016-12-13 | Huawei Technologies Co., Ltd. | Cycle-slip detection method and apparatus, and receiver |
Also Published As
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20120051478A1 (en) | Fast cycle slip detection and correction | |
US8498349B2 (en) | Demodulation and decoding for frequency modulation (FM) receivers with radio data system (RDS) or radio broadcast data system (RBDS) | |
US8259859B2 (en) | Method and system for carrier recovery for QAM | |
JP4264585B2 (ja) | 同期回路およびその制御方法 | |
US10341030B2 (en) | Cycle slip compensation in a coherent receiver | |
JP6274100B2 (ja) | 搬送波再生装置および搬送波再生方法 | |
EP3206355B1 (en) | Receiving device, receiving method, and program for reception of non-linearly distorted signals | |
US20110150143A1 (en) | Soft-decision demapping method for digital signal | |
US9876658B2 (en) | Non-coherent multi-symbol-delay differential detector | |
US9264146B2 (en) | Detection and removal of cycle slip from received signals | |
US9362865B2 (en) | Demodulation device, demodulation method and program | |
US8081027B2 (en) | Reception device, control method, and program | |
Nasr et al. | A soft maximum likelihood technique for time delay recovery | |
JP2006129536A (ja) | 搬送波再生装置 | |
WO2014187742A1 (en) | Apparatus, method and computer program for recovering a phase of a received signal | |
US8532227B2 (en) | Method and apparatus for robust and high efficiency FEC frame header recovery | |
EP3605883B1 (en) | Method and apparatus for correcting phase jump | |
US9450715B2 (en) | Method and system for modulation-independent carrier phase recovery | |
US20210281465A1 (en) | Detection and mitigation of oscillator phase hit | |
KR100819054B1 (ko) | Mpsk 시스템의 기저대역 수신기에서의 반송파 복원장치 및 방법 | |
KR102384422B1 (ko) | 수신 장치 및 방법, 복조 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |