WO2002021712A1 - Procede d'estimation de voie et systeme permettant de mettre en oeuvre ledit procede - Google Patents

Procede d'estimation de voie et systeme permettant de mettre en oeuvre ledit procede Download PDF

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Publication number
WO2002021712A1
WO2002021712A1 PCT/CN2000/000262 CN0000262W WO0221712A1 WO 2002021712 A1 WO2002021712 A1 WO 2002021712A1 CN 0000262 W CN0000262 W CN 0000262W WO 0221712 A1 WO0221712 A1 WO 0221712A1
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WO
WIPO (PCT)
Prior art keywords
phase
channel
signal
signals
amplitude
Prior art date
Application number
PCT/CN2000/000262
Other languages
English (en)
Chinese (zh)
Inventor
Yonghui Li
Daoben Li
Original Assignee
Linkair Communications, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linkair Communications, Inc. filed Critical Linkair Communications, Inc.
Priority to CN00819744.XA priority Critical patent/CN1208910C/zh
Priority to PCT/CN2000/000262 priority patent/WO2002021712A1/fr
Priority to AU2000269780A priority patent/AU2000269780A1/en
Publication of WO2002021712A1 publication Critical patent/WO2002021712A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

Definitions

  • the present invention relates to the technical field of wireless spread-spectrum communication and digital mobile communication, and in particular, to a method for channel estimation in a high data rate transmission and high-speed mobile environment, and a signal transmission and reception system for implementing the method.
  • Background of the invention
  • phase shift keying (PSK) modulation systems In modern high-speed mobile communications, due to the requirements for high data rates, research on high-dimensional phase shift keying (PSK) modulation systems has gradually become one of the core contents of wireless communications.
  • PSK phase shift keying
  • multipath and large Doppler frequency shifts have been the main bottlenecks that limit the application of multilevel and multiphase modulation methods in high-speed mobile environments.
  • the main factor affecting the performance of a PSK system is the effect of fast fading on the amplitude and phase of the PSK system.
  • the amplitude deep fading will seriously degrade the performance of the system.
  • effective channel estimation To overcome these effects of fading channels, effective channel estimation must be performed.
  • the continuous pilot is only used in the downlink communication of the CDMA communication system from the base station to the mobile station.
  • the transmitting end uses a dedicated channel to conduct the frequency signal, and sends it with the signals of other channels.
  • the signals of other channels at the receiving end are related to this pilot signal to eliminate the phase offset caused by the channel transmission process, so that each channel demodulates the original information.
  • Continuous pilots can to some extent eliminate the effects of deep fading caused by high-speed movement.
  • the pilot channel is required to be transmitted together with the signals of all other channels, and a dedicated channel is occupied. Therefore, the transmit power of the transmitter must be increased. Therefore, continuous pilot is only used in downlink communication (from base station to mobile station) of synchronous CDMA system.
  • the dedicated pilot is to transmit a pilot symbol at a certain interval in each channel of the transmitting end, and use the channel parameters estimated by the pilot symbol to perform channel compensation on the data symbols following the pilot symbol to eliminate channel pairing. Effects of transmitted signals. It is easy to see from the principle of dedicated pilots that in a high-speed mobile environment, because the correlation between adjacent symbols is reduced, the compensation of data symbols following the pilot symbol channel estimation value is obviously Inaccurate, so this solution cannot effectively overcome the effects of deep fading on signal amplitude and phase, and cannot guarantee the application of higher-dimensional modulation methods in high-speed mobile environments. Summary of the invention
  • An object of the present invention is to provide a channel estimation method applied in a high-data-rate transmission and high-speed mobile environment, so as to overcome the technical problems and defects existing in the foregoing prior art solutions.
  • the method of the present invention can save the transmission power of the signal, can effectively overcome the influence of deep fading on the signal amplitude and phase, and can It guarantees the advantages of applying higher-dimensional modulation methods in high-speed mobile environments.
  • a channel estimation method applied to a high data rate transmission and high speed mobile environment includes the following steps: The data source input by a transmitting end is spread by a pair of mutually orthogonal spreading code groups to form a dual-channel transmission The two signals are sent after being combined; The received signal is separated into two channels by using the same orthogonal spreading code pair generated locally, and multi-phase matched channel estimation is performed by the dual-channel signal in a multi-phase diversity manner.
  • the performing multi-phase matching channel estimation through dual-channel signals in a multi-phase diversity manner includes the following steps:
  • the multi-phase matching channel estimation in a multi-phase diversity manner through a two-channel signal may further include the following steps:
  • a signal transmitting and receiving system implementing the above method of the present invention includes a signal transmitting end and a receiving end, where the transmitting end includes a signal input part, a spread spectrum modulation part, a radio frequency modulation part, and an antenna, and the receiving end includes an antenna and a radio frequency demodulation part.
  • the spread-spectrum modulation part of the transmitting end is a two-channel spread-spectrum modem, and the data source output by the signal input part is spread by a pair of mutually orthogonal spreading code groups
  • the two signals are sent to a signal combining device, and are combined and sent to an antenna for transmission;
  • the channel estimation part of the receiving end is a polyphase matching channel estimator, which will be received by the antenna, The intermediate frequency received signal output after radio frequency demodulation is separated into two signal channels by using the same orthogonal "frequency code group", and the multi-phase matched channel estimation is performed through the two channel signals.
  • the above-mentioned multi-phase matched channel estimator includes a dual-channel despread demodulation device, a dual-channel amplitude and phase separation device, an arithmetic device, and a merging device; the signals received by the antenna, demodulated by radio frequency, and demodulated by the local intermediate frequency are output by The channel de-spreading and demodulation device performs channel separation and de-spreading and demodulation; the dual-channel amplitude and phase separation device separately separates the amplitude and phase of the dual-channel signal; the amplitude is determined by the arithmetic device, and the phase is determined by multiple phase diversity;
  • the merging device 4 performs maximum ratio merging according to the determined amplitude and phase.
  • the novel channel estimation method for high data rate transmission and high speed mobile environment proposed by the present invention is implemented by orthogonal demodulation and Appropriate mathematical combination operations are used to obtain the parameters of some channels such as phase difference.
  • the more types of diversity the more obvious the performance improvement of the system.
  • System performance is scored The effect of the number of times of the set can finally reach the performance of BPSK, so it can effectively overcome the effects of deep fading caused by high speed on the signal amplitude and phase.
  • applying this method can ensure the application of 16PSK, 32PSK in high-speed mobile environments 64PSK These higher-dimensional modulations.
  • the channel estimation method of the present invention implements channel estimation by using two independent channels at a base station and a mobile station, and adopting multiple phases for matching reception at the receiving end, so this channel estimation method can be called a multi-phase matching channel estimation
  • the method is called CEMPM (Channel Estimation by using Multiple Phase Matching) method.
  • CEMPM Channel Estimation by using Multiple Phase Matching
  • FIG. 1 is a basic block diagram of a wireless communication system according to the method of the present invention.
  • Fig. 2 is a block diagram of a preferred embodiment of the method according to the present invention.
  • Fig. 3 is a block diagram of another preferred embodiment of the method according to the present invention. Mode of Carrying Out the Invention
  • the two signals formed are:
  • E. Is the transmitted signal energy and is the initial phase.
  • C, (t), C 2 (t), and te [0, r] are mutually orthogonal spreading code groups with a code length of M.
  • the two-channel signal modulators 11, 12 may be a baseband modulator or an intermediate frequency modulator.
  • ⁇ is the amplitude and phase of the signal points in the signal constellation, respectively.
  • the dual-channel signal formed at the transmitting end is transmitted by the transmitting antenna 15 after passing through the adder 13 and the radio frequency modulator 14.
  • the signal is received by the receiving antenna 20, passes through the radio frequency demodulator 21, and enters the channel estimator 22.
  • the signal is the sum of the following two formulas:
  • the received signals are separated into two channels by two locally generated spreading codes, and then the two locally generated orthogonal carrier signals are used to compare the two signals.
  • the signals of the channels are demodulated. Two channels pass through the same fading channel and are interfered by the same additive white Gaussian noise.
  • the 2M + 1 sets of two orthogonal signals generated locally are used to demodulate the received signal.
  • the value of M is less than or equal to the modulation dimension.
  • the locally generated 2M + 1 groups of two orthogonal signals are: ⁇ C (t -kT- iT c ) cos ( «(t-kT) + ⁇ , ⁇ ), JC (t -kT- iT c ) sin (6> (t-kT) + ⁇ ⁇ ) kk
  • i the ith diversity signal
  • M is the phase of the local carrier, so 2M + 1 carriers with a phase interval of 2 ⁇ IM are used for tracking locally.
  • ⁇ ⁇ (t) ⁇ cos ( ⁇ + ⁇ 3 ⁇ 4 + ⁇ ⁇ ) + n u (t)
  • the absolute value of the sine value of the equation can be demodulated by the local carrier with the smallest absolute value. This task is performed by the operator 35.
  • the arithmetic unit 37 combines the estimation results of each path with a maximum ratio
  • Anin is the ⁇ value that minimizes the absolute value of the sine value of (7).
  • the performance of the system is about the same as that of the BPSK system.
  • the arithmetic unit 45 multiplies the output results of the arithmetic units 42 and 44 by some regular expressions (8). Number cos ( m ), sin (5 m ), and select the compensation phase that minimizes the absolute value of the formula (6).
  • the arithmetic unit 47 is used to combine the compensation phase calculated by the arithmetic unit 45 with the phase output by the arithmetic unit 42 To form the phase required for decision.
  • the compensation phase is obtained by calculation, and the value of
  • the merging is performed by operations C0S ⁇ + /? Min :), ⁇ ! ⁇ + ⁇ Achieved.
  • the judgment can be performed.
  • the phase error of the zero-phase carrier estimation still needs to be corrected.
  • the arithmetic unit 48 combines the estimation results of each path with a maximum ratio.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un procédé d'estimation de voie utilisé dans la transmission de données à débit élevé et dans un environnement mobile à vitesse élevée ainsi qu'un système permettant de mettre en oeuvre ledit procédé. Selon ce procédé, une source de données introduites à partir d'un terminal d'envoi subit un étalement du spectre par deux groupes de cryptage par étalement du spectre qui sont orthogonaux entre eux de manière à former deux embranchements de signaux qui sont transmis par deux voies et qui sont envoyées après avoir été combinés ; au niveau du terminal de réception, les signaux reçus sont séparés en deux voies au moyen des deux mêmes groupes de cryptage par étalement du spectre et effectuent une estimation de voie de la mise en correspondance à phases multiples selon le principe de diversité de phases multiples via les deux voies. On peut ainsi améliorer la précision du système, sans augmenter la complexité du système.
PCT/CN2000/000262 2000-09-05 2000-09-05 Procede d'estimation de voie et systeme permettant de mettre en oeuvre ledit procede WO2002021712A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN00819744.XA CN1208910C (zh) 2000-09-05 2000-09-05 一种信道估计的方法及实现该方法的系统
PCT/CN2000/000262 WO2002021712A1 (fr) 2000-09-05 2000-09-05 Procede d'estimation de voie et systeme permettant de mettre en oeuvre ledit procede
AU2000269780A AU2000269780A1 (en) 2000-09-05 2000-09-05 A method of channel estimation and a system for implementing the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2000/000262 WO2002021712A1 (fr) 2000-09-05 2000-09-05 Procede d'estimation de voie et systeme permettant de mettre en oeuvre ledit procede

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WO2002021712A1 true WO2002021712A1 (fr) 2002-03-14

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CN (1) CN1208910C (fr)
AU (1) AU2000269780A1 (fr)
WO (1) WO2002021712A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7816370B2 (en) 2004-01-30 2010-10-19 Institut National De La Sante Et De La Recherche Medicale Use of epothilones in the treatment of neuronal connectivity defects such as schizophrenia and autism

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9542929B2 (en) 2014-09-26 2017-01-10 Intel Corporation Systems and methods for providing non-lexical cues in synthesized speech
CN114095106B (zh) * 2021-11-19 2023-05-16 北京邮电大学 一种针对pam4互连系统信道环境损伤影响的检测方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5905946A (en) * 1994-11-03 1999-05-18 Nokia Mobile Phones Ltd. Method for estimating a channel and a receiver
CN1250566A (zh) * 1997-01-15 2000-04-12 艾利森公司 在ofdm传输系统中进行信道估计的方法和装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5905946A (en) * 1994-11-03 1999-05-18 Nokia Mobile Phones Ltd. Method for estimating a channel and a receiver
CN1250566A (zh) * 1997-01-15 2000-04-12 艾利森公司 在ofdm传输系统中进行信道估计的方法和装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7816370B2 (en) 2004-01-30 2010-10-19 Institut National De La Sante Et De La Recherche Medicale Use of epothilones in the treatment of neuronal connectivity defects such as schizophrenia and autism
US8513280B2 (en) 2004-01-30 2013-08-20 Institut National De La Sante Et De La Recherche Medicale Use of epothilones in the treatment of neuronal connectivity defects such as schizophrenia and autism

Also Published As

Publication number Publication date
CN1208910C (zh) 2005-06-29
AU2000269780A1 (en) 2002-03-22
CN1460331A (zh) 2003-12-03

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