WO2006049082A1 - 受信装置及びパスサーチ方法 - Google Patents
受信装置及びパスサーチ方法 Download PDFInfo
- Publication number
- WO2006049082A1 WO2006049082A1 PCT/JP2005/019807 JP2005019807W WO2006049082A1 WO 2006049082 A1 WO2006049082 A1 WO 2006049082A1 JP 2005019807 W JP2005019807 W JP 2005019807W WO 2006049082 A1 WO2006049082 A1 WO 2006049082A1
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- WO
- WIPO (PCT)
- Prior art keywords
- power
- path
- delay profile
- threshold
- maximum signal
- Prior art date
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- 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
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7113—Determination of path profile
-
- 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
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
- H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
Definitions
- the present invention relates to a receiving apparatus and a path search method used for CDMA (Code Division Multiple Access) communication.
- CDMA Code Division Multiple Access
- Patent Document 1 As a conventional receiving apparatus and path search method, there is one disclosed in Patent Document 1.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus.
- the receiving apparatus 10 mainly includes a path holding unit 11, a delay profile calculation unit 12, a noise power calculation unit 13, a threshold value calculation unit 14, and a nose detection unit 15.
- the path holding unit 11 holds information (reception timing, phase, etc.) related to the position of the path detected last time, and updates information related to the position of the path output from the path detection unit 15.
- the delay profile calculation unit 12 measures the received signal power delay profile.
- the noise power calculation unit 13 calculates the average noise power N from the average value of the delay profile excluding several samples before and after each path position from the information on the path position held by the path holding unit 11.
- the path detection unit 15 determines that the path is a valid path (desired signal) when the received power is larger than the threshold value TH, detects information about the path position of the desired signal (reception timing, phase, etc.), and detects the detected path.
- the information on the position of the is output to the path holding unit 11 and the post-process equipment.
- the average noise power N is multiplied by a predetermined coefficient X to calculate the threshold value TH, and the received power is larger than the threshold value TH. Judged as a valid path (desired signal).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-101549
- the conventional receiving apparatus and path search method have a signal power to noise power ratio (S Depending on the size of the N ratio, the optimum threshold TH cannot be calculated, and the desired signal and noise components cannot be accurately determined, resulting in a deterioration in reception characteristics.
- FIGS. 2A, 2B, 3A, and 3B show the relationship between the delay profile and the threshold TH.
- the horizontal axis indicates time
- the vertical axis indicates received power
- 21 and 22 are desired signals that should be detected originally
- 23 is a noise component.
- An object of the present invention is to provide a receiving apparatus capable of calculating an optimum threshold value using one fixed coefficient and accurately determining a desired signal and a noise component regardless of the SN ratio. And providing a nos search method.
- the receiving apparatus of the present invention includes a delay profile calculating means for measuring a received signal power delay profile, a maximum signal power calculating means for calculating a maximum signal power S of the delay profile, and an average noise power N of the delay profile.
- a path detecting means for detecting a path larger than the threshold as an effective path is adopted.
- the path search method of the present invention includes a delay profile calculation step for measuring a delay profile from a received signal, and a maximum signal for calculating the maximum signal power S of the delay profile.
- a power calculation step a noise power calculation step of calculating an average noise power N of the delay profile, a threshold calculation step of calculating a threshold using the maximum signal power S and the average noise power N,
- a path detecting step of detecting a path whose received power measured in the delay profile calculating step is greater than the threshold as an effective path.
- the threshold value between the minimum value of the desired signal and the maximum value of the noise component can be calculated regardless of the size of the SN ratio. Judgment can be made with high accuracy and deterioration of reception characteristics can be prevented.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus
- FIG. 2A is a diagram showing a relationship between a delay profile and a threshold in a conventional receiver
- FIG. 2B is a diagram showing the relationship between the delay profile and the threshold value in the conventional receiver.
- FIG. 3A is a diagram showing a relationship between a delay profile and a threshold value in a conventional receiver.
- FIG. 3B is a diagram showing a relationship between a delay profile and a threshold value in a conventional receiver.
- FIG. 4 is a block diagram showing a configuration of a receiving apparatus according to an embodiment of the present invention.
- FIG. 5A is a diagram showing a relationship between a delay profile and a threshold value in the above embodiment of the present invention.
- FIG. 5B is a diagram showing the relationship between the delay profile and the threshold value in the above embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of a receiving apparatus according to an embodiment of the present invention.
- the receiving apparatus 100 includes a path holding unit 101, a delay profile calculation unit 102, a noise power calculation unit 103, a maximum signal power calculation unit 104, a threshold value calculation unit 105, and a path detection unit 106. And is composed mainly of.
- the path holding unit 101 holds information (reception timing, phase, etc.) relating to the previously detected path position, and updates information related to the path position output from the path detection unit 106.
- the delay profile calculation unit 102 also measures the delay profile of the received signal power.
- the noise power calculation unit 103 calculates the average noise power N from the average value of the delay profile excluding several samples before and after each path position from the information on the nose position held by the path holding unit 101.
- Maximum signal power calculation section 104 calculates maximum signal power S from the delay profile.
- the threshold calculation unit 105 calculates a sum ((SN) XX + N) of the difference between the maximum signal power S and the average noise power N and a predetermined coefficient X and the average noise power (TH). Calculate as'.
- the path detection unit 106 determines an effective path (desired signal) when the received power is larger than the threshold value TH ′, and determines as a noise component when the received power is smaller than the threshold value TH ′.
- Information on the position of the path is detected, and information on the position of the detected path is output to the path holding unit 101 and the subsequent process equipment.
- FIG. 5A shows an example of a delay profile when the signal power to noise power ratio (SN ratio) is large.
- Figure 5B shows an example of a delay profile when the signal-to-noise ratio is small.
- the horizontal axis represents time
- the vertical axis represents received power
- 201 and 202 are desired signals to be detected originally
- 203 is a noise component.
- the maximum signal power S is used as a parameter for calculating the threshold value TH ′ based on the general relationship between the magnitude of the SN ratio and the value of the average noise power N. Specifically, the sum of the difference between the maximum signal power S and average noise power N and the predetermined coefficient X and the average noise power ((S — N) XX + N) is calculated as the threshold TH. .
- the threshold value TH is calculated to be large when the SN ratio is small, and the desired signal 22 cannot be detected (FIG. 2B).
- the threshold TH ′ is calculated to be small when the SN ratio is small.
- the desired signal 202 can be detected (FIG. 5B).
- the threshold TH is calculated to be small when the S / N ratio is large, and the noise component 23 is erroneously detected as a desired signal. ( Figure 3B).
- the threshold TH ′ is calculated to be large when the SN ratio is large, and the desired signal 201 , 202 can be detected (FIG. 5A).
- the maximum signal power S is used for calculating the threshold value TH ′ in a meter, so that the minimum value of the desired signal can be obtained regardless of the SN ratio. Since a threshold value between the maximum value of the noise component can be calculated, it is possible to accurately determine the desired signal and the noise component and prevent deterioration of the reception characteristics.
- the present invention is suitable for use in a receiving apparatus in CDMA wireless communication.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-319477 | 2004-11-02 | ||
JP2004319477A JP2006135420A (ja) | 2004-11-02 | 2004-11-02 | 受信装置及びパスサーチ方法 |
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WO2006049082A1 true WO2006049082A1 (ja) | 2006-05-11 |
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PCT/JP2005/019807 WO2006049082A1 (ja) | 2004-11-02 | 2005-10-27 | 受信装置及びパスサーチ方法 |
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WO (1) | WO2006049082A1 (ja) |
Families Citing this family (1)
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JP4929041B2 (ja) * | 2007-05-10 | 2012-05-09 | パイオニア株式会社 | ノイズ除去装置、その方法、ノイズ除去プログラム及びその記録媒体 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000101549A (ja) * | 1998-09-24 | 2000-04-07 | Nec Corp | Cdma受信装置及びそれに用いるパス検出方法並びにその制御プログラムを記録した記録媒体 |
JP2002026767A (ja) * | 2000-07-04 | 2002-01-25 | Nec Corp | Cdma受信装置及びパス検出方法 |
JP2002152087A (ja) * | 2000-11-14 | 2002-05-24 | Hitachi Kokusai Electric Inc | パス検出装置 |
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2004
- 2004-11-02 JP JP2004319477A patent/JP2006135420A/ja active Pending
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2005
- 2005-10-27 WO PCT/JP2005/019807 patent/WO2006049082A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000101549A (ja) * | 1998-09-24 | 2000-04-07 | Nec Corp | Cdma受信装置及びそれに用いるパス検出方法並びにその制御プログラムを記録した記録媒体 |
JP2002026767A (ja) * | 2000-07-04 | 2002-01-25 | Nec Corp | Cdma受信装置及びパス検出方法 |
JP2002152087A (ja) * | 2000-11-14 | 2002-05-24 | Hitachi Kokusai Electric Inc | パス検出装置 |
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