WO1995024773A2 - Emetteur, recepteur et procede de transmission de donnees - Google Patents

Emetteur, recepteur et procede de transmission de donnees Download PDF

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Publication number
WO1995024773A2
WO1995024773A2 PCT/FI1995/000121 FI9500121W WO9524773A2 WO 1995024773 A2 WO1995024773 A2 WO 1995024773A2 FI 9500121 W FI9500121 W FI 9500121W WO 9524773 A2 WO9524773 A2 WO 9524773A2
Authority
WO
WIPO (PCT)
Prior art keywords
symbols
multilevel
data
information
transmitted
Prior art date
Application number
PCT/FI1995/000121
Other languages
English (en)
Other versions
WO1995024773A3 (fr
Inventor
Tero OJANPERÄ
Kari Rikkinen
Ilkka Keskitalo
Original Assignee
Nokia Telecommunications Oy
Nokia Mobile Phones Ltd.
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 Nokia Telecommunications Oy, Nokia Mobile Phones Ltd. filed Critical Nokia Telecommunications Oy
Priority to AU18511/95A priority Critical patent/AU1851195A/en
Publication of WO1995024773A2 publication Critical patent/WO1995024773A2/fr
Publication of WO1995024773A3 publication Critical patent/WO1995024773A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Definitions

  • the invention relates to a data transmission method in which data bits are modulated prior to transmission by means of multilevel orthogonal or biorthogonal modulation.
  • a base station in addition to user speech or data information, other extra information, such as power adjustment commands or other control messages, is transmitted between a base station and a mobile station. This extra information is transmitted constantly during a speech connection, normally through a traffic channel.
  • a power adjustment message can comprise only one of the two possible values: a power increase or power reduce command. Rough adjustment of this kind is not always sufficient in rapidly changing situations. Furthermore, interference occuring on the radio path may easily cause interference to extra information bits.
  • the invention also relates to a transmitter which comprises means for modulating the data bits to be transmitted by means of multilevel orthogonal or biorthogonal modulation, and means for interleaving the modulated symbols.
  • the transmitter of the invention is characterized in that the transmitter comprises means for modulating bits containing power adjustment messages or phase reference information by employing multilevel modulation corresponding to that employed for data bits, and means for selecting either a multilevel symbol containing data bits or a multilevel symbol containing power adjustment messages for transmission at each given time.
  • the invention further relates to a receiver comprising means for demodulating and decoding the received multilevel orthogonal or biorthogonal symbols, and means for deinterleaving the received signal.
  • the receiver of the invention is characterized by comprising means for separating symbols containing power adjustment messages or phase reference information from data symbols.
  • the extra information to be transmitted is described, like data bits, with multilevel symbols transmitted along with the data bits.
  • extra information is transmitted by replacing a data symbol with a multilevel symbol containing the extra information.
  • symbols containing extra information are inserted in between the data symbols.
  • multilevel modulation allows an increase in the amount of transmitted information, since several consecutive information bits may be described with one multilevel symbol.
  • power adjustment messages are transmitted, more information on the desired power change can be transmitted than a mere power increase or power reduce command. In such a case, however, the reliability of the transmission is not improved compared with prior art methods.
  • the invention can also be implemented e.g. for transmission of phase reference information required by coherent detection.
  • the invention will be described in greater detail with reference to the examples in accordance with the accompanying drawings, in which
  • Figures la-lc show two methods for transmission of extra information in a frame structure
  • FIG. 2 is a block diagram illustrating the structure of a transmitter of the invention
  • FIG. 3 is a block diagram illustrating the structure of a transmitter of the invention in greater detail
  • Figures 4a and 4b are block diagrams illustrating the structure of a receiver of the invention.
  • the solution of the invention may be implemented in a telecommunications system employing orthogonal or biorthogonal modulation.
  • information bits are modulated to multilevel orthogonal or biorthogonal symbols.
  • methods for multilevel modulation are described in greater detail e.g. in Finnish Patent Application 935047.
  • the signal to be transmitted is encoded by a combination of convolution code and biorthogonal modulation.
  • a serial form signal to be transmitted may be converted such that per each data bit, m+1 parallel form code bits b 0 -b m are obtained.
  • Bits b 1 -b m of the above code bits determine one of 2 m possible orthogonal symbols, the symbol consisting of 2 m parallel binary symbols, and code bit b 0 determining the sign of said orthogonal symbol. Finally, 2 m parallel binary symbols are converted to serial form for transmission.
  • the extra information to be transmitted is encoded, like the actual user data bits, e.g. by means of the method described above, and transmitted along with the data bits, either by inserting the information in between the data bits, or by replacing some part of the data bits with information bits.
  • Figures la, lb and lc illustrate different embodiments of the invention for transmitting extra information, from the point of view of the frame structure.
  • Figure la shows a normal frame structure, which comprises consecutive data symbols 1,2,3, and 4 to be transmitted.
  • Figure lb shows an alternative, in which data symbol 2 has been replaced with symbol x containing extra information. Replacing data symbols naturally causes a slight impairment of the signal quality at the receiving end.
  • Figure lc again, shows an embodiment in which symbol x containing extra information has been inserted in between data symbols 1 and 2. As the extra information is inserted along with the actual data in this way, the bandwidth of the signal to be transmitted expands.
  • data bits 10 to be transmitted which may be user speech or data bits, are applied to a convolution coder 11, which may typically be e.g. a serial to parallel converter, from the output of which the signal is applied in a parallel form to a multilevel modulator 12, which may be e.g. a Walsh modulator.
  • a group of input bits are described with one multilevel symbol, which may be e.g. an orthogonal or a biorthogonal symbol.
  • the output of the modulator has been connected to interleaving means 13, in which the signal to be transmitted is interleaved to reduce the effect of transmission path interference.
  • Extra information 15 to be transmitted is applied to a multilevel modulator means 17, which corresponds to the modulator means 12 employed for the user data signal.
  • the extra information to be transmitted may be either a single bit or multilevel information, such as a dB power value.
  • a clock signal 18 controls a switch means 19, which controls the transmission of the extra information. When user data symbols are transmitted, the switch is in position A. Normally, one extra information symbol is transmitted at a time. When the clock signal 18 indicates the extra information symbol is to be transmitted, the switch turns to position B.
  • the clock signal 18 may be a pulse given at certain fixed intervals.
  • Power adjustment commands are time-critical messages, and thus cannot be applied through an interleaving block 13 due to delay requirements.
  • the detailed structure of the transmitter of the invention naturally depends on the encoding/modulation method employed in the system.
  • blocks 11 and 12 of the transmitter described above, as well as block 17, may be in accordance with e.g. figure 3.
  • a signal 20 to be transmitted is applied to a convolution coder 21, which can be implemented e.g. with a k+1 bit shift register.
  • the output of the convolution coder provides m+1 code bits 22, which may be denoted by b,,, ⁇ , ...b m , and which in the above figure are the last k+1 input bits, i.e. k is equal to m. It is also possible that k is greater than m, and that the output bits are not in the same order as the bits inputted in the coder, and that the output bits do not directly correspond to the bits inputted in the coder, but are their XOR sum combinations.
  • a biorthogonal modulator 23 has been implemented in two phases, orthogonal modulation being carried out first, and biorthogonal modulation of the resulting symbol being carried out thereafter.
  • the i th transmitted orthogonal symbol (i.e. signal queue) ⁇ may be defined with a formula
  • the M-level set of symbols (S j ) may be e.g. an
  • the set of symbols may be described by a Walsh-Hadamard matrix, in which each row of the Walsh-Hadamard matrix represents one possible symbol S j .
  • Code bit b 0 is employed for determining the sign of the obtained orthogonal symbol, e.g. by employing the code bit as an input in calculation 26 of the sign, so that when b 0 is 1, the output of means 26 is -1, and when b 0 is 0, the output of means 26 is +1.
  • the binary symbols at the output of the modulator can be multiplied by the output of means 26 in a multiplier 25, which results in M binary symbols 24, defining now a 2 m+1 level signal.
  • an M-level orthogonal set of symbols is expanded to a 2M-level biorthogonal set of symbols.
  • the symbol to be transmitted may be one of the M-level Walsh signals or its negative equivalent.
  • the signal is converted to a serial form.
  • modulation means 12 The actual data is applied from modulation means 12 to the interleaving means 13, and extra information is applied from modulation means 17 to the switch means 19.
  • the structure of a receiver in accordance with the method of the invention is illustrated with block diagrams in figures 4a and 4b.
  • the receiver comprises means 31 and 32 for demodulating and decoding the received signal, and means 33 for deinterleaving.
  • a received signal 30 is first applied to a switch means 35, which is controlled by a clock signal 34.
  • the switch means is employed for separating symbols containing extra information from data symbols, which, subsequent to deinterleaving 33, are applied to demodulation and decoding means 31 and 32, which may typically be e.g. a Walsh-Hadamard converter and a Viterbi decoder.
  • demodulation and decoding means 31 and 32 which may typically be e.g. a Walsh-Hadamard converter and a Viterbi decoder.
  • the symbols containing extra information are separated from the remaining signal prior to the interleaving and the Walsh-Hadamard converter.
  • Figure 4b shows a receiver realizing another preferred embodiment of the invention, the receiver comprising switch means 37 and 38 controlled by the clock signal 34, said switch means allowing separation of the symbols containing extra information from the remaining signal prior to deinterleaving 33.
  • symbols containing extra information are applied to the demodulation means 31, which is typically a Walsh-Hadamard converter, as above.
  • the receiver further comprises switch means 39 controlled by the clock signal 34, said switch means guiding the extra information further to processing prior to the Viterbi decoder 32. If extra symbols are replacing data symbols, zero values are fed into the Viterbi decoder instead of an extra symbol. If extra symbols have been inserted in between data symbols, the Viterbi decoder is not timed during the extra symbols, but it will wait for the following actual data symbol.

Landscapes

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

Abstract

L'invention porte sur un émetteur, un récepteur et un procédé de transmission de données dans lequel les bits de données sont modulés avant transmission à l'aide d'une modulation orthogonale et biorthogonale à plusieurs niveaux. Pour assurer la fiabilité de la transmission, des informations supplémentaires sont transmises en même temps que les symboles des données à plusieurs niveaux, lesdites informations supplémentaires, représentées par des symboles identiques à ceux des symboles des données, servant à transmettre des messages d'ajustement de puissance ou des informations de référence de phase.
PCT/FI1995/000121 1994-03-07 1995-03-03 Emetteur, recepteur et procede de transmission de donnees WO1995024773A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18511/95A AU1851195A (en) 1994-03-07 1995-03-03 A data transmission method, transmitter, and receiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI941071A FI941071A (fi) 1994-03-07 1994-03-07 Tiedonsiirtomenetelmä, lähetin sekä vastaanotin
FI941071 1994-03-07

Publications (2)

Publication Number Publication Date
WO1995024773A2 true WO1995024773A2 (fr) 1995-09-14
WO1995024773A3 WO1995024773A3 (fr) 1995-11-09

Family

ID=8540263

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000121 WO1995024773A2 (fr) 1994-03-07 1995-03-03 Emetteur, recepteur et procede de transmission de donnees

Country Status (3)

Country Link
AU (1) AU1851195A (fr)
FI (1) FI941071A (fr)
WO (1) WO1995024773A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017789A1 (fr) * 1995-11-06 1997-05-15 Kumar Derek D Systeme et procede de multiplexage d'un systeme de communication a spectre etale
WO2000016524A1 (fr) * 1998-09-11 2000-03-23 Ericsson Inc. Estimation de voie dans un systeme cdma utilisant des bits de commande de puissance
WO2001033735A1 (fr) * 1999-11-04 2001-05-10 Infineon Technologies Ag Dispositif pour introduire des donnees de commande de puissance dans un signal d'emission
WO2003073644A1 (fr) * 2002-02-25 2003-09-04 Qualcomm, Incorporated Retroaction de la qualite de la voie, utile pour la commande de puissance dans un systeme amcr

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414352A2 (fr) * 1989-06-26 1991-02-27 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Emetteur radio à commande de puissance de sortie
WO1992016059A1 (fr) * 1991-03-06 1992-09-17 Nokia Telecommunications Oy Methode et dispositif de commande d'un emetteur radio
WO1992016058A1 (fr) * 1991-03-06 1992-09-17 Nokia Telecommunications Oy Methode et dispositif de commande d'un emetteur radio
EP0579372A2 (fr) * 1992-07-03 1994-01-19 NCR International, Inc. Procédé de commande de puissance dans un système de communication sans fil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0414352A2 (fr) * 1989-06-26 1991-02-27 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Emetteur radio à commande de puissance de sortie
WO1992016059A1 (fr) * 1991-03-06 1992-09-17 Nokia Telecommunications Oy Methode et dispositif de commande d'un emetteur radio
WO1992016058A1 (fr) * 1991-03-06 1992-09-17 Nokia Telecommunications Oy Methode et dispositif de commande d'un emetteur radio
EP0579372A2 (fr) * 1992-07-03 1994-01-19 NCR International, Inc. Procédé de commande de puissance dans un système de communication sans fil

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017789A1 (fr) * 1995-11-06 1997-05-15 Kumar Derek D Systeme et procede de multiplexage d'un systeme de communication a spectre etale
US5825807A (en) * 1995-11-06 1998-10-20 Kumar; Derek D. System and method for multiplexing a spread spectrum communication system
WO2000016524A1 (fr) * 1998-09-11 2000-03-23 Ericsson Inc. Estimation de voie dans un systeme cdma utilisant des bits de commande de puissance
AU754226B2 (en) * 1998-09-11 2002-11-07 Ericsson Inc. Channel estimates in a cdma system using power control bits
US6658050B1 (en) 1998-09-11 2003-12-02 Ericsson Inc. Channel estimates in a CDMA system using power control bits
KR100680458B1 (ko) * 1998-09-11 2007-02-08 에릭슨 인크. 전력 제어 비트를 사용하여 부호 분할 다중 액세스시스템에서의 채널 추정
WO2001033735A1 (fr) * 1999-11-04 2001-05-10 Infineon Technologies Ag Dispositif pour introduire des donnees de commande de puissance dans un signal d'emission
US7110369B2 (en) 1999-11-04 2006-09-19 Infineon Technologies Ag Apparatus for placing power control data in a transmission signal
US7539149B2 (en) 1999-11-04 2009-05-26 Infineon Technologies Ag Apparatus and method for placing power control data in a transmission signal
WO2003073644A1 (fr) * 2002-02-25 2003-09-04 Qualcomm, Incorporated Retroaction de la qualite de la voie, utile pour la commande de puissance dans un systeme amcr
CN100407588C (zh) * 2002-02-25 2008-07-30 高通股份有限公司 Cdma系统中功率控制的信道质量反馈
US7986672B2 (en) 2002-02-25 2011-07-26 Qualcomm Incorporated Method and apparatus for channel quality feedback in a wireless communication

Also Published As

Publication number Publication date
WO1995024773A3 (fr) 1995-11-09
FI941071A0 (fi) 1994-03-07
AU1851195A (en) 1995-09-25
FI941071A (fi) 1995-09-08

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