WO1994027389A1 - Recepteur a diversite dans le temps - Google Patents

Recepteur a diversite dans le temps Download PDF

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Publication number
WO1994027389A1
WO1994027389A1 PCT/JP1994/000400 JP9400400W WO9427389A1 WO 1994027389 A1 WO1994027389 A1 WO 1994027389A1 JP 9400400 W JP9400400 W JP 9400400W WO 9427389 A1 WO9427389 A1 WO 9427389A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
time diversity
detector output
time
sample value
Prior art date
Application number
PCT/JP1994/000400
Other languages
English (en)
Japanese (ja)
Inventor
Shogo Ito
Yoshiaki Hirai
Toshihiro Nozawa
Original Assignee
Ntt Mobile Communications Network 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 Ntt Mobile Communications Network Inc. filed Critical Ntt Mobile Communications Network Inc.
Priority to CA002136182A priority Critical patent/CA2136182C/fr
Publication of WO1994027389A1 publication Critical patent/WO1994027389A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits

Definitions

  • the present invention relates to a receiver for performing time diversity reception for performing high quality signal transmission in wireless communication with fusing.
  • INDUSTRIAL APPLICATION This invention is utilized for the receiver in mobile communications, such as a radio selective call.
  • Figure 1 shows the configuration of a receiver that performs time diversity reception using a conventional reception level.
  • the operation on the transmitting side transmits the same code signal a plurality of times.
  • FIG. 1 a case where a binary code is received will be described as an example.
  • the signal received via antenna 1 is input to reception Z demodulator 2 and reception level detector 3.
  • the output signal of the detector output from the reception Z demodulator 2 is sign-determined as binary data (0 or 1) by the sign discriminator 4, and then input to the signal processing unit 6 that performs time diversity processing.
  • the signal of the reception level output from the reception level detector 3 is input to the signal processing unit 6 after being sampled by the AZD converter 5.
  • the signal processing unit 6 compares the received level sample value received this time with the received level sample value of the signal received up to the previous time stored in the memory 7 for each code, and corresponds to the higher received level sample value. Perform time diversity processing to select binary data.
  • the signal processing section 6 stores the sample value and the corresponding binary data in the memory 7 and outputs the sample value and the binary data to the terminal 8 as an output.
  • the reception level detector 3 in order to perform time diversity reception processing that can realize high quality transmission, the reception level detector 3 is required, which complicates the circuit and increases power consumption.
  • the time diversity processing means detects a signal received by retransmission.
  • a time diversity receiver which performs time diversity reception processing using a detector output and a detector output for a signal received up to the previous time.
  • the time diversity processing means includes a sampling circuit for sampling the detector output, and a memory for storing the sampled value.
  • the time diversity processing means includes an absolute value of the sampled value of the detector output with respect to the signal received by retransmission and the memory. Means for comparing, for each code, the absolute value of the sampled value of the detector output with respect to the signal received up to the previous time stored in the same received signal, and selecting the sampled value whose absolute value is larger And means for performing the same.
  • the time diversity processing unit further includes a sampling circuit that samples the detector output, and a memory that stores the sampled value, wherein the time diversity processing unit stores the sampled value of the detector output with respect to the signal received by retransmission, and stores the sampled value in the memory. Means for adding, for each code, the sampled value of the output of the detector with respect to the signal received up to the previous time for the same received signal.
  • each is composed of n (n is a natural number of 2 or more) subframes of a fixed length, each containing a separate paging signal of the receiver.
  • n is a natural number of 2 or more subframes of a fixed length
  • each containing a separate paging signal of the receiver For a paging signal that is inserted into a subframe located at one end of a frame and has a transmission count of two or more times, repeatedly receives the frame with the configuration inserted in the subframe located at a location corresponding to the number of transmissions
  • means are included.
  • a radio paging signal in which the same code signal is transmitted a plurality of times is time-diversified.
  • a time diversity receiver that performs high-quality reception by performing high-speed processing, it performs time diversity processing on the sampled values of the detector output without performing reception level detection, and does not require a reception level detector.
  • the absolute value of the sampled value of the detector output of the signal received this time is compared with the absolute value of the sampled value of the detector output up to the previous time, and the larger sample value is selected to select the time diversity. Perform processing. At the same time, the sample value after the time diversity reception processing is written to the memory, and the code is determined for each code.
  • time diversity processing by addition processing can be performed.
  • the time diversity reception processing is performed only from the detector output, a circuit related to the reception level detection is not necessary, which simplifies the circuit configuration and reduces the power required for the reception level detection circuit. Since there is no consumption, the power consumption of the receiver can be reduced.
  • FIG. 1 is a diagram showing a configuration of a conventional time diversity receiver that performs a time diversity reception process by detecting a reception level.
  • FIG. 2 is a diagram showing a configuration of a time diversity receiver according to the first embodiment and the second embodiment of the present invention.
  • FIG. 3 is a diagram for explaining the time diversity processing operation for the detector output of the first embodiment.
  • FIG. 3 a shows the detector output for the first received signal
  • FIG. 3 b shows the detector output for the second received signal. The detector output is shown.
  • FIG. 4 is a diagram showing an example of a frame signal format configuration suitable for the embodiment of the present invention.
  • FIG. 4a shows a frame configuration at time s0
  • FIG. 4b shows a frame configuration at time s0 + T. .
  • FIG. 5 is a flowchart showing a time diversity processing operation in the first embodiment of the present invention.
  • FIG. 6 illustrates the time diversity processing operation for the detector output of the second embodiment.
  • FIG. 7 is a flowchart showing a time diversity processing operation in the second embodiment of the present invention.
  • the time diversity receiver of this embodiment includes an antenna 1, a reception Z demodulator 2 for receiving and demodulating a reception signal received via the antenna 1, and an AZD as a sampling circuit for sampling a detector output. It comprises a converter 5, a memory 7 for storing the sample values, a signal processing unit 9 for performing a time diversity process, and a sign determination unit 10.
  • the signal processing unit 9 performs processing on a signal received by retransmission.
  • the absolute value of the sample value of the detector output and the absolute value of the sample value of the detector output with respect to the previously received signal stored in the memory are compared for each code with respect to the same received signal. Means for selecting a sample value whose absolute value is larger, and a sample value after the time diversity reception processing is written to the memory and output to the code determiner 10 for code determination for each code. And a stage.
  • the signal received via antenna 1 is input to receive Z demodulator 2.
  • the detector output signal output from the reception Z demodulator 2 is sampled for each code in the AZD converter 5, and then input to the signal processing unit 9.
  • the signal processing unit 9 calculates the time divergence Z that satisfies the following equation (1) using the sample value X of the signal received this time for each code and the sample value Y of the same signal received from the memory 7 up to the previous time. Performs the reception process.
  • the signal processing unit 9 stores the sample value Z in the memory 7 and outputs the sample value Z to the sign determination unit 10 after the end of the time diversity reception.
  • sign decision unit 1 A value of 0 determines the sign of the sample value Z as binary data (0 or 1), and outputs this binary data to the terminal 8. By repeating this operation, high-quality signal transmission can be realized on a mobile communication transmission line with fusing.
  • the code determination operation of the code determiner 10 can be performed by the signal processing unit 9, and in this case, the code determiner 10 does not need to be provided separately.
  • FIG. 3 is a diagram for explaining an operation of sampling and sampling the detector output signal, comparing the absolute values of the sampled values, and performing time diversity processing.
  • the detector output for the first received signal has a waveform as shown in Fig. 3a.
  • This waveform is sampled at a predetermined sampling timing to obtain sample values of Y,, Y 2 , ⁇ 3 ,.
  • the first sample value is stored in the memory 7 and output to the sign determiner 10.
  • the detector output for the second signal has a waveform as shown in Fig. 2b.
  • Sample values sampled for the detector output is X,, X 2, X 3 , ... it becomes.
  • the signal processing unit 9 the last sample value stored in the memory 7 ⁇ ,, ⁇ 2, ⁇ 3, ... absolute value and the current sample value X,, chi 2, chi 3, ...
  • the sample value having the larger absolute value is stored in the memory 7 as ⁇ , ⁇ 2 ⁇ 3 ,.
  • ⁇ is larger.
  • ⁇ 2 and ⁇ 2 have opposite signs, but the absolute value of X 2 is larger.
  • FIG. 4a shows the frame configuration at time s0
  • FIG. 3 shows a frame configuration of s 0 + T.
  • T is the period of the frame.
  • This frame consists of n fixed-length subframes following the frame synchronization signal.
  • a new frame one or more paging signals are inserted in the first subframe, and the mth subframe is inserted.
  • the paging signal transmitted at the m-th time is inserted in the frame. Focusing on one paging signal, the position moves by one subframe every frame period. Referring to the examples shown in FIGS.
  • FIG. 5 is a flowchart showing an operation example of the time diversity processing using the frame signal shown in FIG. 4 in the radio paging system of the present embodiment. However, this figure focuses on a subframe containing one and the same signal.
  • time diversity reception processing can be performed by applying only the detector output without detecting the reception level.
  • the configuration of the receiver is the same as that of the first embodiment, and the time diversity receiving process in the signal processing unit 9 is different from that of the first embodiment.
  • the signal received via antenna 1 is input to receive Z demodulator 2. Further, the detector output signal output from the reception Z demodulator 2 is standardized for each code in the AZD converter 5 and then input to the symbol processing section 9.
  • the signal processing unit 9 calculates, for each code, a time diversity reception that calculates ⁇ that satisfies the following equation (2) from the sample value X of the signal received this time and the sample value ⁇ of the same signal received up to the previous time from the memory 7. Perform processing.
  • the signal processing section 9 stores the sample value ⁇ in the memory 7 and outputs the sample value ⁇ to the sign determination device 10. Further, the sign judging unit 10 judges the sign of the sample value ⁇ ⁇ ⁇ as binary data, and outputs the binary data to the terminal 8.
  • the detector output for the first received signal has the waveform shown in FIG. 6A.
  • the waveform is sampled at a predetermined sampling timing, obtaining Y,, Y 2, Y 3 , ... a sample value of.
  • the first sample value is stored in the memory 7 and output to the sign half-value device 10.
  • the detector output for the second signal has the waveform shown in Fig. 6b.
  • the sampled values of the sampling for the detector output are X, X 2 , ⁇ 3 ,.
  • the signal processing unit 9 performs an addition process on the previous sample values ⁇ , ⁇ 2 , ⁇ 3 ,...
  • FIG. 7 is a flowchart showing the operation of the time diversity processing using the frame signal shown in FIG. 4 in the radio paging method of the second embodiment. However, this figure focuses on a subframe containing one and the same signal.
  • the operation has been described by taking as an example the case of receiving a binary code.
  • the present invention is similarly effective when a code of three or more values is received.
  • the sign determinator may correspond to the number of code values.

Landscapes

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

Abstract

La fonction diversité dans le temps du récepteur présenté s'opère par utilisation du signal de sortie d'un détecteur d'onde mais sans faire appel à un circuit servant à détecter le niveau de réception. Ainsi, le circuit du récepteur est simplifié et la consommation d'énergie est réduite.
PCT/JP1994/000400 1993-05-19 1994-03-14 Recepteur a diversite dans le temps WO1994027389A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002136182A CA2136182C (fr) 1993-05-19 1994-03-14 Appareil de reception en diversite temporelle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5/117216 1993-05-19
JP5117216A JP2974880B2 (ja) 1993-05-19 1993-05-19 時間ダイバーシチ受信機

Publications (1)

Publication Number Publication Date
WO1994027389A1 true WO1994027389A1 (fr) 1994-11-24

Family

ID=14706274

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Application Number Title Priority Date Filing Date
PCT/JP1994/000400 WO1994027389A1 (fr) 1993-05-19 1994-03-14 Recepteur a diversite dans le temps

Country Status (3)

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JP (1) JP2974880B2 (fr)
CA (1) CA2136182C (fr)
WO (1) WO1994027389A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3056077B2 (ja) * 1996-07-19 2000-06-26 静岡日本電気株式会社 タイムダイバーシチ受信装置
JP2845825B2 (ja) * 1996-08-14 1999-01-13 静岡日本電気株式会社 無線選択呼出受信機
JP2957490B2 (ja) * 1996-09-18 1999-10-04 静岡日本電気株式会社 ４値ｆｓｋ受信機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543412A (en) * 1977-06-09 1979-01-11 Nec Corp Signal detection circuit
JPS60501387A (ja) * 1983-05-23 1985-08-22 アメリカン テレフオン アンド テレグラフ カムパニ− 受信信号中の確率的情報を使用するデ−タ検出器
JPH04368033A (ja) * 1991-06-14 1992-12-21 Sony Corp ビット検出方式

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543412A (en) * 1977-06-09 1979-01-11 Nec Corp Signal detection circuit
JPS60501387A (ja) * 1983-05-23 1985-08-22 アメリカン テレフオン アンド テレグラフ カムパニ− 受信信号中の確率的情報を使用するデ−タ検出器
JPH04368033A (ja) * 1991-06-14 1992-12-21 Sony Corp ビット検出方式

Also Published As

Publication number Publication date
JP2974880B2 (ja) 1999-11-10
JPH06334572A (ja) 1994-12-02
CA2136182A1 (fr) 1994-11-24
CA2136182C (fr) 2006-05-09

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