JPH0630058A - Carrier wave corrector - Google Patents
Carrier wave correctorInfo
- Publication number
- JPH0630058A JPH0630058A JP4179613A JP17961392A JPH0630058A JP H0630058 A JPH0630058 A JP H0630058A JP 4179613 A JP4179613 A JP 4179613A JP 17961392 A JP17961392 A JP 17961392A JP H0630058 A JPH0630058 A JP H0630058A
- Authority
- JP
- Japan
- Prior art keywords
- unit
- reception
- reception signal
- frequency deviation
- received signal
- 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.)
- Granted
Links
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディジタル移動通信等
に使用する搬送波補正装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier correction device used for digital mobile communication and the like.
【０００２】[0002]
【従来の技術】従来、ディジタル移動通信等におけるデ
ータ受信装置では、特に受信信号の周波数ずれの補正を
行なっていないために、受信信号と復調キャリアとの間
に周波数のずれがある時は、図４に示すように、基準点
からシンボル数が離れるほど位相のずれ（誤差）が大き
くなっている。このため、データの復調に同期検波を用
いると、周波数ずれの影響がそのまま響き、特に基準点
から離れたデータの誤り率の劣化が大きい。そこで、周
波数ずれの大きいシステムでは、その影響が小さく済む
ように遅延検波器が用いられている。2. Description of the Related Art Conventionally, in a data receiving apparatus in digital mobile communication or the like, since the frequency deviation of the received signal is not corrected, when the frequency deviation between the received signal and the demodulation carrier occurs, As shown in 4, the phase shift (error) increases as the number of symbols increases from the reference point. For this reason, if synchronous detection is used for data demodulation, the influence of frequency deviation will be heard as it is, and in particular, the error rate of data far from the reference point will be greatly degraded. Therefore, in a system with a large frequency shift, a delay detector is used so as to reduce its influence.
【０００３】図５に従来のデータ受信装置の概略構成を
示す。図５において、３１は入力端子、３２は遅延検波
部、３３は出力端子であり、入力端子３１に受信信号が
入力されると、遅延検波部３２において変調信号を復調
し、そのデータを出力端子３３へ出力する。FIG. 5 shows a schematic configuration of a conventional data receiving apparatus. In FIG. 5, 31 is an input terminal, 32 is a delay detection section, and 33 is an output terminal. When a received signal is input to the input terminal 31, the delay detection section 32 demodulates a modulated signal and outputs the data. Output to 33.
【０００４】このように従来のデータ受信装置でも、遅
延検波器を用いることにより、ある程度の周波数ずれが
あっても受信信号を復調することができる。As described above, even in the conventional data receiving apparatus, by using the delay detector, the received signal can be demodulated even if there is some frequency shift.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
データ受信装置では、遅延検波器を用いて復調を行なっ
ているため、同期検波器を使用する場合に比べて復調デ
ータの特性が劣ってしまい、また歪が線形でないために
等化器が使えず遅延波の影響を除去できないという問題
があった。However, in the conventional data receiving apparatus, since demodulation is performed using the delay detector, the characteristics of the demodulated data are inferior to the case where the synchronous detector is used, Further, since the distortion is not linear, the equalizer cannot be used and the influence of the delayed wave cannot be removed.
【０００６】本発明は、このような従来の問題を解決す
るものであり、データ受信において、受信信号の周波数
ずれを補正するとともに同期検波により復調して、復調
データ特性の向上を図り、さらに等化器の使用も可能に
する優れた搬送波補正装置を提供することを目的とす
る。The present invention solves such a conventional problem. In data reception, the frequency deviation of the received signal is corrected and demodulated by synchronous detection to improve demodulated data characteristics. It is an object of the present invention to provide an excellent carrier correction device that enables the use of a rectifier.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記目的を達
成するために、受信信号を格納するメモリ部と、メモリ
部に格納された受信信号をある基準に集約する受信信号
集約部と、受信信号集約部により集約された受信信号の
誤差が最小になるような１次近似式を求める１次近似式
導出部と、１次近似式導出部によって求められた１次近
似式により受信信号の周波数ずれを検出する周波数ずれ
検出部と、メモリ部に格納された受信信号を周波数ずれ
検出部により検出された周波数ずれ分だけ回転させて補
正する受信波回転部と、受信波回転部により補正された
信号を同期検波する同期検波部とを備えたものである。In order to achieve the above-mentioned object, the present invention comprises a memory section for storing received signals, a received signal aggregating section for aggregating the received signals stored in the memory section with a certain reference, The first-order approximation formula derivation unit that obtains a first-order approximation formula that minimizes the error of the reception signals collected by the reception-signal collection unit and the first-order approximation formula that is obtained by the first-order approximation formula derivation unit A frequency shift detection unit that detects a frequency shift, a received wave rotation unit that rotates the received signal stored in the memory unit by the frequency shift detected by the frequency shift detection unit, and corrects the received wave rotation unit. And a synchronous detection section for synchronously detecting the signal.
【０００８】[0008]
【作用】本発明は上記構成により次のような作用を有す
る。まず、受信信号をメモリ部に格納する。次に、受信
信号集約部により、メモリ部に格納された受信信号をあ
る基準に集約する。次に、１次近似式導出部により、受
信信号集約部で集約された受信信号の誤差が最小になる
ような１次近似式を求める。次に周波数ずれ検出部によ
り、１次近似式導出部で求められた１次近似式を用いて
受信信号の周波数ずれを検出する。そして、受信波回転
部により、メモリ部に格納された受信信号を周波数ずれ
検出部により検出された周波数ずれ分だけ回転させて補
正し、これを同期検波部により復調する。すなわち、受
信信号の周波数ずれを検出して補正するとともに同期検
波により復調するので、復調データ特性の向上を図るこ
とができ、さらに等化器の使用を可能にすることができ
るという効果を有する。The present invention has the following actions due to the above-mentioned configuration. First, the received signal is stored in the memory unit. Next, the received signal aggregating unit aggregates the received signals stored in the memory unit based on a certain standard. Next, the first-order approximation formula derivation unit obtains a first-order approximation formula that minimizes the error of the reception signals aggregated by the reception signal aggregation unit. Next, the frequency shift detection unit detects the frequency shift of the received signal using the first-order approximation formula obtained by the first-order approximation formula derivation unit. Then, the received wave rotation unit corrects the received signal stored in the memory unit by rotating the received signal by the frequency shift detected by the frequency shift detection unit, and demodulated by the synchronous detection unit. That is, since the frequency shift of the received signal is detected and corrected, and demodulated by the synchronous detection, the demodulated data characteristic can be improved and the equalizer can be used.
【０００９】[0009]
【実施例】図１は本発明の一実施例の構成を示すもので
ある。図１において、１１は受信信号を受け取る入力端
子であり、１２は入力端子１１に接続されたメモリ部で
あり、入力端子１１に入力された受信信号を格納する。
１３はメモリ部１２に接続された受信信号集約部であ
り、メモリ部１２に格納された受信信号をある基準に集
約する。１４は受信信号集約部１３に接続された１次近
似式導出部であり、受信信号集約部１３により集約され
た受信信号の誤差が最小になるような１次近似式を求め
る。１５は１次近似式導出部１４に接続された周波数ず
れ検出部であり、１次近似式導出部１４により得られた
１次近似式を用いて周波数ずれを検出する。１６はメモ
リ部１２および周波数ずれ検出部１５に接続された受信
波回転部であり、メモリ部１２に格納された受信信号を
周波数ずれ検出部１５で検出された周波数ずれ分だけ回
転させてその周波数ずれを補正する。１７は受信波回転
部１６に接続された同期検波部であり、周波数ずれを補
正された信号を復調する。１８は同期検波部１７に接続
された出力端子であり、出力データを送出する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 11 is an input terminal for receiving a reception signal, 12 is a memory unit connected to the input terminal 11, and stores the reception signal input to the input terminal 11.
Reference numeral 13 is a received signal aggregating unit connected to the memory unit 12, and aggregates the received signals stored in the memory unit 12 based on a certain standard. Reference numeral 14 is a first-order approximation formula derivation unit connected to the reception signal aggregating unit 13, and obtains a first-order approximation formula that minimizes the error of the reception signals aggregated by the reception signal aggregating unit 13. Reference numeral 15 is a frequency shift detection unit connected to the primary approximation formula derivation unit 14 and detects the frequency shift using the primary approximation formula obtained by the primary approximation formula derivation unit 14. Reference numeral 16 is a reception wave rotation unit connected to the memory unit 12 and the frequency shift detection unit 15. The received signal stored in the memory unit 12 is rotated by the frequency shift detected by the frequency shift detection unit 15 to generate its frequency. Correct the deviation. Reference numeral 17 is a synchronous detection unit connected to the reception wave rotation unit 16 and demodulates a signal whose frequency deviation has been corrected. Reference numeral 18 is an output terminal connected to the synchronous detection unit 17, and outputs output data.
【００１０】次に上記実施例の動作について説明する。
上記実施例において、まず受信信号が入力端子１１に入
力されると、この受信信号がメモリ部１２に格納され
る。次に受信信号集約部１３により、メモリ部１２に格
納された受信信号をある基準に集約する。例えば図２
（ａ），（ｂ）に示すように、θずれたＧＭＳＫ変調信
号を受信したとすると、この信号をＩ軸、Ｑ軸を基準と
して受信した点がどこに位置するものかを判断して第Ｉ
象限に集約する。次いで、１次近似式導出部１４によ
り、受信信号集約部１３により集約された受信信号の誤
差が最小になるような１次近似式を求める。図３に示す
ように、雑音等の影響で位相ずれは直線上にのらないた
め最小２乗法等を用いて上記のように集約された受信信
号との誤差が最小になるような１次近似式を求める。次
いで、周波数ずれ検出部１５により、１次近似式導出部
１４から得られた１次近似式を用いて周波数ずれを検出
する。次いで、受信波回転部１６により、メモリ部１２
に格納された受信信号を周波数ずれ検出部１５で検出さ
れた周波数ずれ分だけ回転させることでその周波数ずれ
を補正する。そして、同期検波部１７により、受信波回
転部１６で周波数ずれを補正された信号を検波し、その
出力データを出力端子１８から出力する。Next, the operation of the above embodiment will be described.
In the above embodiment, when the received signal is first input to the input terminal 11, the received signal is stored in the memory section 12. Next, the received signal aggregating unit 13 aggregates the received signals stored in the memory unit 12 based on a certain standard. Figure 2
As shown in (a) and (b), if a GMSK modulated signal deviated by θ is received, it is judged whether the point where this signal is received with reference to the I-axis and the Q-axis is located.
Collect in quadrants. Next, the first-order approximation formula derivation unit 14 obtains a first-order approximation formula that minimizes the error of the received signals aggregated by the received signal aggregation unit 13. As shown in FIG. 3, since the phase shift does not lie on a straight line due to the influence of noise and the like, the first-order approximation that minimizes the error with the received signal aggregated as described above by using the least square method or the like. Find the formula. Next, the frequency shift detection unit 15 detects the frequency shift using the primary approximation formula obtained from the primary approximation formula derivation unit 14. Then, the received wave rotation unit 16 causes the memory unit 12 to
The frequency shift is corrected by rotating the received signal stored in the frequency shift detector 15 by the frequency shift detected by the frequency shift detector 15. Then, the synchronous detection unit 17 detects the signal whose frequency deviation has been corrected by the reception wave rotation unit 16, and outputs the output data from the output terminal 18.
【００１１】このように、上記実施例によれば、受信信
号の周波数ずれを補正するとともに、同期検波器を用い
て同期検波を行なうので、復調データ特性を向上させる
ことができ、さらに等化器が使用可能となり、遅延波の
影響を除去することができる。As described above, according to the above embodiment, since the frequency shift of the received signal is corrected and the synchronous detection is performed by using the synchronous detector, the demodulated data characteristic can be improved and the equalizer can be further improved. Can be used, and the effect of delayed waves can be eliminated.
【００１２】[0012]
【発明の効果】上記実施例から明らかなように、本発明
の搬送波補正装置によれば、データ受信において受信信
号の周波数ずれを検出して補正するとともに、同期検波
器を用いて復調するので、復調データの特性向上を図る
ことができ、さらに等化器の使用も可能となって遅延波
の影響を除去することができるという効果を有する。As is apparent from the above embodiments, according to the carrier wave correction apparatus of the present invention, the frequency deviation of the received signal is detected and corrected in the data reception, and the demodulation is performed by using the synchronous detector. The characteristics of the demodulated data can be improved, and the equalizer can be used, so that the effect of the delayed wave can be removed.
【図１】本発明の一実施例における搬送波補正装置の概
略ブロック図FIG. 1 is a schematic block diagram of a carrier correction apparatus according to an embodiment of the present invention.
【図２】同装置における受信信号集約部を説明するため
の図FIG. 2 is a diagram for explaining a received signal aggregating unit in the same device.
【図３】同装置における１次近似式導出部を説明するた
めの図FIG. 3 is a diagram for explaining a first-order approximate expression derivation unit in the same apparatus.
【図４】従来のデータ受信装置における周波数ずれを説
明するための図FIG. 4 is a diagram for explaining a frequency shift in a conventional data receiving device.
【図５】従来のデータ受信装置の概略ブロック図FIG. 5 is a schematic block diagram of a conventional data receiving device.
１１ 入力端子 １２ メモリ部 １３ 受信信号集約部 １４ １次近似式導出部 １５ 周波数ずれ検出部 １６ 受信波回転部 １７ 同期検波部 １８ 出力端子 11 Input Terminal 12 Memory Section 13 Received Signal Aggregation Section 14 Primary Approximation Formula Derivation Section 15 Frequency Deviation Detection Section 16 Received Wave Rotating Section 17 Synchronous Detection Section 18 Output Terminal
Claims (1)
モリ部に格納された受信信号をある基準に集約する受信
信号集約部と、前記受信信号集約部により集約された受
信信号の誤差が最小になるような１次近似式を求める１
次近似式導出部と、前記１次近似式導出部によって求め
られた１次近似式により前記受信信号の周波数ずれを検
出する周波数ずれ検出部と、前記メモリ部に格納された
受信信号を前記周波数ずれ検出部により検出された周波
数ずれ分だけ回転させて補正する受信波回転部と、前記
受信波回転部により補正された信号を同期検波する同期
検波部とを備えた搬送波補正装置。1. A memory unit that stores a received signal, a received signal aggregating unit that aggregates the received signals stored in the memory unit based on a certain reference, and an error of the received signals aggregated by the received signal aggregating unit is minimum. 1 to obtain a linear approximation
A second approximation formula derivation unit, a frequency shift detection unit that detects a frequency shift of the reception signal by the first approximation formula obtained by the first approximation formula derivation unit, and the reception signal stored in the memory unit with the frequency. A carrier wave correction device comprising: a reception wave rotation unit that rotates and corrects a frequency deviation detected by a deviation detection unit; and a synchronous detection unit that synchronously detects the signal corrected by the reception wave rotation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17961392A JP3278907B2 (en) | 1992-07-07 | 1992-07-07 | Carrier correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17961392A JP3278907B2 (en) | 1992-07-07 | 1992-07-07 | Carrier correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0630058A true JPH0630058A (en) | 1994-02-04 |
| JP3278907B2 JP3278907B2 (en) | 2002-04-30 |
Family
ID=16068816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17961392A Expired - Fee Related JP3278907B2 (en) | 1992-07-07 | 1992-07-07 | Carrier correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3278907B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015154137A (en) * | 2014-02-12 | 2015-08-24 | パナソニック株式会社 | Phase rotation correction method and phase rotation correction device |
-
1992
- 1992-07-07 JP JP17961392A patent/JP3278907B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015154137A (en) * | 2014-02-12 | 2015-08-24 | パナソニック株式会社 | Phase rotation correction method and phase rotation correction device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3278907B2 (en) | 2002-04-30 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |