JP4832601B1 - Equalizer and equalization method - Google Patents

Equalizer and equalization method Download PDF

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JP4832601B1
JP4832601B1 JP2011016589A JP2011016589A JP4832601B1 JP 4832601 B1 JP4832601 B1 JP 4832601B1 JP 2011016589 A JP2011016589 A JP 2011016589A JP 2011016589 A JP2011016589 A JP 2011016589A JP 4832601 B1 JP4832601 B1 JP 4832601B1
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received signal
signal strength
equalization
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minimum received
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和彦 菊地
秀太 鈴木
恒太郎 佐藤
和俊 杉本
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

【課題】回路規模を増大させることなく、等化性能を向上させる等化装置及び等化方法を提供する。
【解決手段】順方向等化処理部102は、現フレーム先頭に配置された同期ワードを用いて順方向にトレーニングを行い、現フレームのデータ区間について順方向にトラッキングを行う。逆方向等化処理部104は、次フレーム先頭に配置された同期ワードを用いて逆方向にトレーニングを行い、現フレームのデータ区間について逆方向にトラッキングを行う。RSSI測定部106は、受信信号からRSSIを測定し、RSSI最小位置判定部107は、RSSI最小値及びRSSI最小位置を検出する。RSSI比較部108は、RSSI最小値と所定の閾値との閾値判定を行い、等化結果選択部109は、RSSI最小位置及びRSSI最小値の閾値判定結果に基づいて、順方向等化結果又は逆方向等化結果を等化器出力として選択する。
【選択図】図1
An equalization apparatus and an equalization method for improving equalization performance without increasing the circuit scale are provided.
A forward equalization processing unit performs training in the forward direction using a synchronization word arranged at the head of the current frame, and performs tracking in the forward direction for a data section of the current frame. The reverse equalization processing unit 104 performs training in the reverse direction using the synchronization word arranged at the head of the next frame, and performs tracking in the reverse direction for the data section of the current frame. The RSSI measurement unit 106 measures RSSI from the received signal, and the RSSI minimum position determination unit 107 detects the RSSI minimum value and the RSSI minimum position. The RSSI comparison unit 108 performs a threshold determination between the RSSI minimum value and a predetermined threshold, and the equalization result selection unit 109 performs the forward equalization result or the reverse based on the RSSI minimum position and the threshold determination result of the RSSI minimum value. The direction equalization result is selected as the equalizer output.
[Selection] Figure 1

Description

本発明は、等化処理を行う等化装置及び等化方法に関する。   The present invention relates to an equalization apparatus and an equalization method for performing equalization processing.

0.技術の背景と課題
0.1.従来の装置構成
無線通信システムは、マルチパスの影響を受けることにより、符号間干渉が生じ、通信品質が劣化することが知られている。そのため、マルチパスの影響を低減するため、遅延等化器が必要である。
0. Technical background and issues 0.1. Conventional Device Configuration It is known that inter-symbol interference occurs due to the influence of multipath, and communication quality deteriorates in a wireless communication system. Therefore, a delay equalizer is necessary to reduce the influence of multipath.

遅延等化器は、2つのFIRフィルタで構成され、既知シンボルを用いたトレーニングにより等化結果と既知シンボルとの誤差が最小となるようにタップ係数を収束させる。タップ係数が収束した遅延等化器は、既知シンボルより後方に位置するデータに順方向等化を行い、既知シンボルより前方に位置するデータに逆方向等化を行う。このような技術の応用が特許文献1に開示されている。   The delay equalizer is composed of two FIR filters, and converges the tap coefficient so that the error between the equalization result and the known symbol is minimized by training using the known symbol. The delay equalizer with the tap coefficient converged performs forward equalization on the data located behind the known symbol, and reverse equalization on the data located ahead of the known symbol. The application of such a technique is disclosed in Patent Document 1.

0.2.特許文献1に開示の等化器
特許文献1には、既知シンボルの後方に順方向等化及び逆方向等化を行い、既知シンボルの前方に順方向等化及び逆方向等化を行い、後方と前方のそれぞれにおいて、順方向等化結果と逆方向等化結果とを比較して、既知シンボルとの誤差が小さい等化結果を採用することにより、等化性能を向上させる技術が開示されている。
0.2. Equalizer disclosed in Patent Document 1 In Patent Document 1, forward equalization and reverse equalization are performed behind a known symbol, forward equalization and reverse equalization are performed in front of a known symbol, and backward A technique for improving equalization performance by comparing the forward equalization result with the reverse equalization result and adopting an equalization result with a small error from a known symbol in each of the forward and backward directions is disclosed. Yes.

特開2009−10919号公報JP 2009-10919 A

0.3.本発明の課題
しかしながら、上述した特許文献1に開示の技術では、既知シンボルの後方に配置されたデータの順方向等化が終了すると、続いて、既知シンボルの前方に配置されたデータの順方向等化を行うが、このとき、1フレーム分離れたシンボルを処理するため、位相が不連続となり、タップ係数の補正が必要である。これは、逆方向等化においても同様である。このタップ係数の補正に要する演算は複雑であり、この演算を行うために等化器がさらに1つ必要となることから、回路規模が増大するという問題がある。
0.3. However, in the technique disclosed in Patent Document 1 described above, when the forward equalization of data arranged behind a known symbol is completed, the forward direction of data arranged in front of the known symbol is continued. At this time, since symbols separated by one frame are processed, the phase becomes discontinuous, and correction of tap coefficients is necessary. The same applies to reverse equalization. The calculation required for correcting the tap coefficient is complicated, and one more equalizer is required to perform this calculation, which increases the circuit scale.

0.4.本発明の目的
本発明の目的は、回路規模を増大させることなく、等化性能を向上させる等化装置及び等化方法を提供することである。
0.4. An object of the present invention is to provide an equalization apparatus and an equalization method that improve equalization performance without increasing the circuit scale.

本発明の等化装置は、現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化手段と、次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化手段と、受信信号の受信信号強度を測定する受信信号強度測定手段と、前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定手段と、検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較手段と、検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択手段と、を具備し、前記等化結果選択手段は、前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値以上の場合、データ区間先頭からデータ区間中心までは順方向等結果を選択し、データ区間中心からデータ区間末尾までは逆方向等化結果を選択する構成を採る。 The equalization apparatus according to the present invention performs forward training using a known signal arranged at the head of the current frame, performs forward tracking on the data section of the current frame, and obtains a forward equalization result. Equalization means and reverse direction equalization means for performing training in the reverse direction using a known signal arranged at the head of the next frame and tracking the data section of the current frame in the reverse direction to obtain the reverse direction equalization result Reception signal strength measuring means for measuring the received signal strength of the received signal, and the minimum reception among the received signal strengths measured in the section from the known signal of the current frame to the known signal of the next frame A received signal strength minimum position determining means for detecting a signal strength and a position that is the minimum received signal strength, the detected minimum received signal strength, Based on the comparison means for performing threshold determination with respect to the threshold of the detected value, the detected position of the minimum received signal strength and the result of the threshold determination, the forward equalization result or the reverse equalization result is selected. Equalization result selection means , wherein the equalization result selection means detects the minimum received signal strength in the known signal section of the current frame, and the detected minimum received signal strength is If it is less than the threshold, a reverse equalization result is selected, the minimum received signal strength is detected in the known signal section of the next frame, and the detected minimum received signal strength is less than the threshold A forward equalization result is selected, and if the minimum received signal strength is detected in the known signal interval and the detected minimum received signal strength is greater than or equal to the threshold value, the head of the data interval Until Luo data interval around selects the forward or the like result from the data section center to data segment trailing a configuration of selecting a reverse equalization results.

本発明の等化方法は、現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化工程と、次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化工程と、受信信号の受信信号強度を測定する受信信号強度測定工程と、前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定工程と、検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較工程と、検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択工程と、を具備し、前記等化結果選択工程は、前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値以上の場合、データ区間先頭からデータ区間中心までは順方向等結果を選択し、データ区間中心からデータ区間末尾までは逆方向等化結果を選択するようにした。 The equalization method of the present invention performs forward training using a known signal placed at the head of the current frame, and forward-tracks the data section of the current frame to obtain a forward equalization result. An equalization step and a reverse equalization step in which training is performed in the reverse direction using a known signal arranged at the head of the next frame, and the data section of the current frame is tracked in the reverse direction to obtain a reverse equalization result. And a received signal strength measuring step for measuring a received signal strength of the received signal, and a minimum reception among the received signal strengths measured in a section from the known signal of the current frame to the known signal of the next frame. A received signal strength minimum position determination step for detecting a signal strength and a position that is the minimum received signal strength, the detected minimum received signal strength, The forward equalization result or the reverse direction equalization result is selected based on the comparison step for performing the threshold determination with respect to the threshold, the detected position of the minimum received signal strength, and the threshold determination result. An equalization result selection step , wherein the equalization result selection step detects the minimum received signal strength in the known signal section of the current frame, and the detected minimum received signal strength is If it is less than the threshold, a reverse equalization result is selected, the minimum received signal strength is detected in the known signal section of the next frame, and the detected minimum received signal strength is less than the threshold A forward equalization result is selected, and if the minimum received signal strength is detected in the known signal interval and the detected minimum received signal strength is greater than or equal to the threshold value, the head of the data interval Until Luo data interval around select forward such results, from the data section center to data interval end you have to choose a backward equalization results.

本発明によれば、回路規模を増大させることなく、等化性能を向上させることができる。   According to the present invention, equalization performance can be improved without increasing the circuit scale.

本発明の実施の形態1に係る等化装置の構成を示すブロック図The block diagram which shows the structure of the equalization apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態1に係るフレーム構成を示す図The figure which shows the flame | frame structure which concerns on Embodiment 1 of this invention. 図1に示した等化結果選択部における等化結果選択処理を示すフロー図The flowchart which shows the equalization result selection process in the equalization result selection part shown in FIG. RSSI最小値が同期ワード区間に位置し、かつ、RSSI最小値が閾値未満である場合の等化結果選択処理の様子を示す図The figure which shows the mode of the equalization result selection process in case an RSSI minimum value is located in a synchronous word area, and an RSSI minimum value is less than a threshold value. RSSI最小値が同期ワード区間に位置し、かつ、RSSI最小値が閾値以上である場合の等化結果選択処理の様子を示す図The figure which shows the mode of an equalization result selection process in case an RSSI minimum value is located in a synchronous word area, and an RSSI minimum value is more than a threshold value. RSSI最小位置がデータ区間に位置する場合の等化結果選択処理の様子を示す図The figure which shows the mode of the equalization result selection process in case an RSSI minimum position is located in a data area 本発明の実施の形態2に係る等化結果選択部における等化結果選択処理を示すフロー図The flowchart which shows the equalization result selection process in the equalization result selection part which concerns on Embodiment 2 of this invention. RSSI最小値が閾値1未満の等化結果選択処理の様子を示す図The figure which shows the mode of the equalization result selection process whose RSSI minimum value is less than the threshold value 1. RSSI最小値が閾値1以上かつ閾値2未満の等化結果選択処理の様子を示す図The figure which shows the mode of the equalization result selection process whose RSSI minimum value is more than threshold value 1 and less than threshold value 2 RSSI最小値が閾値2以上の等化結果選択処理の様子を示す図The figure which shows the mode of the equalization result selection process whose RSSI minimum value is more than threshold value 2

以下、本発明の実施の形態について、図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(実施の形態1)
1.実施の形態1
1.1.実施の形態1の等化装置の構成
図1は、本発明の実施の形態1に係る等化装置100の構成を示すブロック図である。以下、図1を用いて等化装置の構成について説明する。この図において、受信信号は現フレーム及び次フレームの先頭に配置された同期ワード(既知シンボル)分受信信号バッファ101に蓄積される。
(Embodiment 1)
1. Embodiment 1
1.1. Configuration of Equalizer of Embodiment 1 FIG. 1 is a block diagram showing a configuration of an equalizer 100 according to Embodiment 1 of the present invention. Hereinafter, the configuration of the equalization apparatus will be described with reference to FIG. In this figure, received signals are stored in the received signal buffer 101 for the synchronization word (known symbol) arranged at the head of the current frame and the next frame.

順方向等化処理部102は、受信信号バッファ101から受信信号を先頭から後端方向に向かって読み込み、読み込んだ受信信号のうち、現フレーム先頭に配置された同期ワードを用いて順方向にトレーニングを行い、現フレームのデータ区間について順方向にトラッキングを行う等化処理を施して、順方向等化結果を順方向等化バッファ103に出力する。   The forward equalization processing unit 102 reads the reception signal from the reception signal buffer 101 from the head toward the rear end, and trains in the forward direction using the synchronization word arranged at the head of the current frame among the read reception signals. Then, an equalization process for tracking the data section of the current frame in the forward direction is performed, and the forward equalization result is output to the forward equalization buffer 103.

逆方向等化処理部104は、受信信号バッファ101から受信信号を後端から先頭方向へ向かって読み込み、読み込んだ受信信号のうち、次フレーム先頭に配置された同期ワードを用いて逆方向にトレーニングを行い、現フレームのデータ区間について逆方向にトラッキングを行う等化処理を施して、逆方向等化結果を逆方向等化バッファ105に出力する。   The backward equalization processing unit 104 reads the received signal from the received signal buffer 101 from the rear end toward the head, and trains in the backward direction using the synchronization word arranged at the head of the next frame among the read received signals. Then, an equalization process is performed to perform tracking in the reverse direction for the data section of the current frame, and the reverse equalization result is output to the reverse equalization buffer 105.

なお、図1では、便宜上等化処理部を順方向、逆方向に分けて図示しているが、運用上は1つの等化処理部を時分割で使用する。もちろん、実装上、図1に示すように等化処理部を2つ用意し、これらを並列動作させてもよい。   In FIG. 1, for the sake of convenience, the equalization processing unit is divided into a forward direction and a reverse direction. However, in the operation, one equalization processing unit is used in a time-sharing manner. Of course, two equalization processing units may be prepared for parallel operation as shown in FIG.

RSSI測定部106は、受信信号から受信信号強度(RSSI:Received Signal Strength Indicator)を算出してRSSI最小位置判定部107に出力する。なお、RSSIは、各シンボルのパワ(すなわち、I+Q)である。 The RSSI measurement unit 106 calculates a received signal strength (RSSI) from the received signal and outputs the received signal strength indicator (RSSI) to the RSSI minimum position determination unit 107. Note that RSSI is the power of each symbol (ie, I 2 + Q 2 ).

RSSI最小位置判定部107は、RSSI測定部106から出力されたRSSIのうち、現フレームの同期ワードから次フレームの同期ワードまでの区間で最小のRSSIを検出し、RSSI最小値をRSSI比較部108に出力すると共に、RSSIが最小となるビット位置又はシンボル位置(RSSI最小位置)を検出して、等化結果選択部109に出力する。   The RSSI minimum position determination unit 107 detects the minimum RSSI in the section from the synchronization word of the current frame to the synchronization word of the next frame, out of the RSSI output from the RSSI measurement unit 106, and determines the RSSI minimum value as the RSSI comparison unit 108. And a bit position or a symbol position (RSSI minimum position) at which the RSSI is minimum is detected and output to the equalization result selection unit 109.

RSSI比較部108は、RSSI最小位置判定部107から出力されたRSSI最小値と所定の閾値との閾値判定を行い、判定結果を等化結果選択部109に出力する。   The RSSI comparison unit 108 performs threshold determination between the RSSI minimum value output from the RSSI minimum position determination unit 107 and a predetermined threshold, and outputs the determination result to the equalization result selection unit 109.

等化結果選択部109は、RSSI最小位置判定部107から出力されたRSSI最小位置及びRSSI比較部108から出力されたRSSI最小値の閾値判定結果に基づいて、順方向等化バッファ103から順方向等化結果を読み出すか、逆方向等化バッファ105から逆方向等化結果を読み出すかを選択して、読み出した等化結果を等化器出力として出力する。なお、具体的な等化結果選択処理については後述する。   The equalization result selection unit 109 forwards from the forward equalization buffer 103 based on the RSSI minimum position output from the RSSI minimum position determination unit 107 and the threshold determination result of the RSSI minimum value output from the RSSI comparison unit 108. Whether to read the equalization result or to read the reverse equalization result from the reverse equalization buffer 105 is selected, and the read equalization result is output as an equalizer output. A specific equalization result selection process will be described later.

1.2.実施の形態1のフレーム構成
図2は、本発明の実施の形態1に係るフレーム構成を示す図である。図2に示すように、フレーム先頭に同期ワードが配置され、同期ワードに後続してフレーム後端までデータが配置される。このようなフレーム構成において、順方向等化処理部102では、現フレームの同期ワードを用いて先頭から後端に向かって(順方向に)トレーニングを行い、現フレームのデータ区間について順方向にトラッキングを行う。一方、逆方向等化処理部104では、次フレームの同期ワードを用いて後端から先頭に向かって(逆方向に)トレーニングを行い、現フレームのデータ区間について逆方向にトラッキングを行う。これにより、同一データ区間で順方向等化結果と逆方向等化結果の2つの等化結果を得ることができる。
1.2. Frame Configuration of Embodiment 1 FIG. 2 is a diagram showing a frame configuration according to Embodiment 1 of the present invention. As shown in FIG. 2, a synchronization word is arranged at the head of the frame, and data is arranged up to the rear end of the frame after the synchronization word. In such a frame configuration, the forward equalization processing unit 102 performs training from the head to the rear end (forward direction) using the synchronization word of the current frame and tracks the data section of the current frame in the forward direction. I do. On the other hand, the reverse equalization processing unit 104 performs training from the rear end to the head (in the reverse direction) using the synchronization word of the next frame, and performs tracking in the reverse direction for the data section of the current frame. Thereby, two equalization results of a forward equalization result and a reverse equalization result can be obtained in the same data section.

1.3.等化結果選択部の等化結果選択処理
次に、上述した等化結果選択部109における等化結果選択処理について図3を用いて説明する。図3において、ステップ(以下、「ST」と省略する)201では、RSSI最小位置が同期ワード区間であるか否かを判定し、RSSI最小位置が同期ワード区間である(YES)場合、ST202に移行し、RSSI最小位置が同期ワード区間ではない(NO)場合、ST207に移行する。
1.3. Equalization Result Selection Processing of Equalization Result Selection Unit Next, the equalization result selection processing in the above-described equalization result selection unit 109 will be described with reference to FIG. In step (hereinafter abbreviated as “ST”) 201 in FIG. 3, it is determined whether or not the RSSI minimum position is a synchronization word interval. If the RSSI minimum position is a synchronization word interval (YES), ST202 is performed. If the RSSI minimum position is not the synchronization word section (NO), the process proceeds to ST207.

ST202では、RSSI最小値の閾値判定結果が閾値未満か否かを検出し、閾値未満ではない(NO)場合、ST203に移行し、閾値未満である(YES)場合、ST204に移行する。   In ST202, it is detected whether or not the threshold determination result of the RSSI minimum value is less than the threshold. If it is not less than the threshold (NO), the process proceeds to ST203, and if it is less than the threshold (YES), the process proceeds to ST204.

ST203では、データ区間先頭からデータ区間中心までは順方向等化結果を選択し、データ区間中心からデータ区間末尾までは逆方向等化結果を選択して、等化結果選択処理を終了する。   In ST203, the forward equalization result is selected from the beginning of the data interval to the center of the data interval, the reverse equalization result is selected from the center of the data interval to the end of the data interval, and the equalization result selection process is terminated.

ST204では、RSSI最小位置が現フレームの同期ワード区間であるか否かを判定し、現フレームの同期ワード区間である(YES)場合、ST205に移行し、現フレームの同期ワード区間ではない(NO)場合、すなわち、次フレームの同期ワード区間である場合、ST206に移行する。   In ST204, it is determined whether or not the RSSI minimum position is the synchronization word section of the current frame. If it is the synchronization word section of the current frame (YES), the process proceeds to ST205 and is not the synchronization word section of the current frame (NO ), That is, if it is the synchronization word section of the next frame, the process proceeds to ST206.

ST205では、全て逆方向等化結果を選択して等化結果選択処理を終了し、ST206では、現フレームの全てについて順方向等化結果を選択して等化結果選択処理を終了する。   In ST205, the reverse equalization results are all selected and the equalization result selection process is terminated. In ST206, the forward equalization results are selected for all the current frames, and the equalization result selection process is terminated.

ST207では、RSSI最小位置がデータ区間前半であるか否かを判定し、データ区間前半である(YES)場合、ST208に移行し、データ区間後半である(NO)場合、ST209に移行する。   In ST207, it is determined whether or not the RSSI minimum position is the first half of the data section. If it is the first half of the data section (YES), the process proceeds to ST208, and if it is the second half of the data section (NO), the process proceeds to ST209.

ST208では、データ区間先頭から(RSSI最小位置+n)までは順方向等化結果を選択し、(RSSI最小位置+n)からデータ区間末尾までは逆方向等化結果を選択して等化結果選択処理を終了する。   In ST208, a forward equalization result is selected from the beginning of the data section to (RSSI minimum position + n), and a reverse equalization result is selected from (RSSI minimum position + n) to the end of the data section to perform an equalization result selection process. Exit.

ST209では、データ区間先頭から(RSSI最小位置−n)までは順方向等化結果を選択し、(RSSI最小位置−n)からデータ区間末尾までは逆方向等化結果を選択して等化結果選択処理を終了する。   In ST209, the forward equalization result is selected from the beginning of the data section to (RSSI minimum position−n), and the reverse equalization result is selected from (RSSI minimum position−n) to the end of the data section. The selection process ends.

次に、上述した等化結果選択処理の様子について説明する。まず、図3に示したST205及びST206の等化結果選択処理の様子を図4に示す。図4(a)はST205の様子を示し、図4(b)はST206の様子を示す。   Next, the above-described equalization result selection process will be described. First, FIG. 4 shows a state of the equalization result selection process of ST205 and ST206 shown in FIG. 4A shows the state of ST205, and FIG. 4B shows the state of ST206.

一般的に、トレーニングを行った同期ワードに近いシンボル位置ほど等化性能が良い。しかしながら、同期ワード区間の受信状態が悪い(RSSI最小値が閾値未満)場合、トレーニングの信頼性が低く、同期ワード近傍であっても十分な等化性能が得られない可能性がある。そのため、閾値未満となるRSSI最小値のシンボル位置が同期ワード区間に存在する場合、同期ワードからの遠近にかかわらず、もう一方の同期ワードでトレーニングを行った等化結果を選択した方が、等化性能が良好である可能性が高い。   In general, the closer the symbol position to the trained synchronization word, the better the equalization performance. However, when the reception state of the synchronization word section is poor (the RSSI minimum value is less than the threshold value), the reliability of training is low, and there is a possibility that sufficient equalization performance cannot be obtained even in the vicinity of the synchronization word. Therefore, when the symbol position of the RSSI minimum value that is less than the threshold value is present in the synchronization word section, it is better to select the equalization result obtained by training with the other synchronization word regardless of the distance from the synchronization word. There is a high possibility that the conversion performance is good.

そのため、図4に示すように、RSSI最小値が同期ワード区間に位置し、そのRSSI最小値が閾値未満である場合、同期ワードが現フレームであれば(図4(a))、現フレームの全てについて逆方向等化結果を選択し、同期ワードが次フレームであれば(図4(b))、現フレームの全てについて順方向等化結果を選択する。   Therefore, as shown in FIG. 4, when the RSSI minimum value is located in the synchronization word section and the RSSI minimum value is less than the threshold, if the synchronization word is the current frame (FIG. 4 (a)), the current frame The reverse equalization result is selected for all, and if the synchronization word is the next frame (FIG. 4B), the forward equalization result is selected for all the current frames.

次に、図3に示したST203の等化結果選択処理の様子を図5に示す。図5(a)及び図5(b)に示すように、RSSI最小値が同期ワード区間に位置し、そのRSSI最小値が閾値以上である場合、データ区間前半については順方向等化結果を選択し、データ区間後半については逆方向等化結果を選択する。   Next, FIG. 5 shows a state of the equalization result selection process of ST203 shown in FIG. As shown in FIG. 5 (a) and FIG. 5 (b), when the RSSI minimum value is located in the synchronization word interval and the RSSI minimum value is greater than or equal to the threshold value, the forward equalization result is selected for the first half of the data interval. Then, the reverse equalization result is selected for the latter half of the data section.

同期ワード区間にRSSI最小値が位置する場合であっても、受信状態が良好(RSSI最小値が閾値以上)な場合、トレーニングの信頼性が十分であると判断できる。この場合、トレーニングを行った同期ワードに近いシンボル位置ほど等化性能が良いため、選択する等化結果をデータ区間の中心で切り替えることにより、等化性能を向上させることができる。   Even if the RSSI minimum value is located in the synchronization word section, it can be determined that the training reliability is sufficient if the reception state is good (the RSSI minimum value is equal to or greater than the threshold). In this case, since the symbol position closer to the synchronization word for which training has been performed has better equalization performance, the equalization performance can be improved by switching the equalization result to be selected at the center of the data section.

最後に、図3に示したST208及びST209の等化結果選択処理の様子を図6に示す。図6(a)はST208の様子を示し、図6(b)はST209の様子を示す。図6に示すように、RSSI最小値がデータ区間前半に位置する場合、(RSSI最小位置+n)を切替位置とし、RSSI最小値がデータ区間後半に位置する場合、(RSSI最小位置−n)を切替位置とし、データ区間先頭から切替位置までは順方向等結果を選択し、切替位置からデータ区間末尾までは逆方向等化結果を選択する。ただし、RSSI最小位置にオフセット量nを加算又は減算したことにより、加算結果又は減算結果がデータ区間の中心を超えてはならない。   Finally, FIG. 6 shows the state of the equalization result selection process of ST208 and ST209 shown in FIG. FIG. 6A shows the state of ST208, and FIG. 6B shows the state of ST209. As shown in FIG. 6, when the RSSI minimum value is located in the first half of the data section, (RSSI minimum position + n) is set as the switching position, and when the RSSI minimum value is located in the latter half of the data section, (RSSI minimum position−n) is set. As a switching position, a forward equality result is selected from the beginning of the data section to the switching position, and a reverse equalization result is selected from the switching position to the end of the data section. However, the addition amount or the subtraction result must not exceed the center of the data section by adding or subtracting the offset amount n to the RSSI minimum position.

RSSI最小値がデータ区間に位置する場合、RSSI最小値のシンボル位置以降は等化器のタップ係数が最適値に収束せずに発散し、等化に失敗する可能性がある。そこで、図6に示すように、RSSI最小位置±nを切替位置とすることにより、同期ワードから等化を行うシンボルまでの距離をできるだけ短くしつつ、タップ係数の発散により誤った等化結果を選択することを回避し、等化性能を向上させることができる。   When the RSSI minimum value is located in the data section, the equalizer tap coefficients may diverge without converging to the optimum value after the symbol position of the RSSI minimum value, and equalization may fail. Therefore, as shown in FIG. 6, by setting the RSSI minimum position ± n as the switching position, the error equalization result due to the divergence of the tap coefficient is obtained while minimizing the distance from the synchronization word to the symbol to be equalized. The selection can be avoided and the equalization performance can be improved.

1.4.オフセット量nの決定方法
ここで、オフセット量nの決定方法について説明する。オフセット量nを同期ワードの種類(誤検出率)から決定する場合と、同期ワードの長さから決定する場合とが考えられる。
1.4. Here, a method for determining the offset amount n will be described. There are cases where the offset amount n is determined from the type (false detection rate) of the synchronization word and the offset amount n is determined from the length of the synchronization word.

まず、同期ワードの種類(誤検出率)からオフセット量nを決定する場合について説明する。同期ワードのパターンが複数用意されており、現フレームと次フレームの同期ワードが異なり、かつ、同期ワードのパターンを検出する必要がある場合、その他のパターンとの相関が高いものほど誤検出の可能性が高い。同期ワードのパターンを誤検出した場合、正しくトレーニングを行うことができないため、等化性能が劣化する。このため、同期パターン毎の誤検出率を考慮してnを決定する。例えば、現フレームより次フレームの同期ワードの誤検出率が0.1%高ければn=1とし、0.2%高ければn=2とすること(ここでは、誤検出率0.1%当たり1シンボルのオフセット)などが考えられる。   First, the case where the offset amount n is determined from the type (false detection rate) of the synchronization word will be described. If there are multiple sync word patterns, the sync words of the current frame and the next frame are different, and it is necessary to detect the sync word pattern, the higher the correlation with the other patterns, the more misdetection is possible. High nature. If a synchronization word pattern is erroneously detected, training cannot be performed correctly, so that equalization performance deteriorates. For this reason, n is determined in consideration of the false detection rate for each synchronization pattern. For example, if the false detection rate of the synchronization word of the next frame is 0.1% higher than the current frame, n = 1, and if it is 0.2% higher, n = 2 (here, the false detection rate per 0.1%). 1 symbol offset) or the like.

次に、同期ワードの長さからオフセット量nを決定する場合について説明する。フレーム毎に送信チャネルが異なる場合などは、現フレームと次フレームの同期ワード長が異なることがあり、同期ワード長が長いほど十分なトレーニングを行うことができる。そのため、例えば、現フレームより次フレームの同期ワード長が2シンボル長い場合、n=−2などのように決定してもよい。   Next, a case where the offset amount n is determined from the length of the synchronization word will be described. When the transmission channel is different for each frame, the synchronization word length of the current frame and the next frame may be different. As the synchronization word length is longer, sufficient training can be performed. Therefore, for example, when the synchronization word length of the next frame is 2 symbols longer than the current frame, n = -2 may be determined.

1.5.実施の形態1の効果
このように、実施の形態1によれば、現フレーム先頭に配置された同期ワードを用いて順方向にトレーニングを行い、現フレームのデータ区間について順方向にトラッキングを行う一方、次フレーム先頭に配置された同期ワードを用いて逆方向にトレーニングを行い、現フレームのデータ区間について逆方向にトラッキングを行い、現フレーム及び次フレームの同期ワードを含む区間におけるRSSI最小位置及びRSSI最小値の閾値判定結果に基づいて、順方向等化結果又は逆方向等化結果を等化器出力として選択する。これにより、より精度の高い等化結果を選択することができるので、回路規模を増大させることなく、等化性能を向上させることができる。
1.5. As described above, according to the first embodiment, training is performed in the forward direction using the synchronization word arranged at the head of the current frame, and tracking is performed in the forward direction for the data section of the current frame. Training in the reverse direction using the synchronization word arranged at the head of the next frame, tracking in the reverse direction for the data section of the current frame, and the RSSI minimum position and RSSI in the section including the synchronization word of the current frame and the next frame Based on the minimum threshold judgment result, the forward equalization result or the reverse equalization result is selected as the equalizer output. As a result, a more accurate equalization result can be selected, so that equalization performance can be improved without increasing the circuit scale.

(実施の形態2)
2.実施の形態2
2.1.実施の形態2の等化装置の構成
本発明の実施の形態2に係る等化装置の構成は、実施の形態1の図1に示した構成と同様であり、その一部の機能が異なるのみなので、図1を援用し、異なる機能について説明する。
(Embodiment 2)
2. Embodiment 2
2.1. Configuration of Equalizer according to Embodiment 2 The configuration of the equalizer according to Embodiment 2 of the present invention is the same as the configuration shown in FIG. Therefore, different functions will be described with reference to FIG.

RSSI比較部108は、大きさの異なる2つの閾値、閾値1及び閾値2(>閾値1)を備え、RSSI最小位置判定部107から出力されたRSSI最小値と閾値1及び閾値2との閾値判定を行い、判定結果を等化結果選択部109に出力する。   The RSSI comparison unit 108 includes two thresholds having different sizes, threshold 1 and threshold 2 (> threshold 1), and threshold determination between the RSSI minimum value output from the RSSI minimum position determination unit 107 and threshold 1 and threshold 2. And the determination result is output to the equalization result selection unit 109.

2.2.等化結果選択部の等化結果選択処理
次に、本発明の実施の形態2に係る等化結果選択部109における等化結果選択処理について図7を用いて説明する。ただし、図7が図3と共通する部分は、図3と同一の符号を付し、重複する説明は省略する。
2.2. Equalization Result Selection Processing of Equalization Result Selection Unit Next, the equalization result selection processing in the equalization result selection unit 109 according to Embodiment 2 of the present invention will be described with reference to FIG. However, the parts in FIG. 7 that are the same as those in FIG. 3 are given the same reference numerals as those in FIG.

ST301では、ST201においてRSSI最小位置が同期ワード区間に位置すると判定された上で、RSSI最小値の閾値判定結果が閾値1以上か否かを検出し、閾値1以上ではない(NO)場合、ST302に移行し、閾値1以上である(YES)場合、ST303に移行する。   In ST301, after it is determined in ST201 that the RSSI minimum position is located in the synchronization word section, it is detected whether the threshold determination result of the RSSI minimum value is greater than or equal to threshold 1, and if it is not greater than or equal to threshold 1 (NO), ST302 If the threshold value is 1 or more (YES), the process moves to ST303.

ST302では、RSSI最小位置が現フレームに位置する場合、現フレームの全てについて逆方向等化を選択し、RSSI最小位置が次フレームに位置する場合、現フレームの全てについて順方向等化結果を選択して、等化結果選択処理を終了する。   In ST302, if the RSSI minimum position is located in the current frame, reverse equalization is selected for all the current frames, and if the RSSI minimum position is located in the next frame, the forward equalization results are selected for all current frames. Then, the equalization result selection process ends.

ST303では、RSSI最小値の閾値判定結果が閾値2以上か否かを検出し、閾値2以上である(YES)場合、ST304に移行し、閾値2以上ではない(NO)場合、ST305に移行する。   In ST303, it is detected whether or not the threshold determination result of the RSSI minimum value is greater than or equal to threshold 2, and if it is greater than or equal to threshold 2 (YES), the process proceeds to ST304, and if it is not greater than or equal to threshold 2 (NO), the process proceeds to ST305. .

ST304では、データ区間先頭から中心までは順方向等化結果を選択し、中心からデータ区間末尾までは逆方向等化結果を選択して、等化結果選択処理を終了する。   In ST304, the forward equalization result is selected from the beginning to the center of the data section, the backward equalization result is selected from the center to the end of the data section, and the equalization result selection process is terminated.

ST305では、RSSI最小位置が現フレームに位置する場合、データ区間先頭から1/3データ区間長離れた位置を切替位置とし、データ区間先頭から切替位置までは順方向等化結果を選択し、切替位置からデータ区間末尾までは逆方向等化結果を選択して、等化結果選択処理を終了する。また、RSSI最小位置が次フレームに位置する場合、データ区間末尾から1/3データ区間長遡った位置を切替位置とし、データ区間先頭から切替位置までは順方向等化結果を選択し、切替位置からデータ区間末尾までは逆方向等化結果を選択して、等化結果選択処理を終了する。   In ST305, when the RSSI minimum position is located in the current frame, the position that is 1/3 data section length away from the head of the data section is set as the switching position, and the forward equalization result is selected and switched from the head of the data section to the switching position. The reverse equalization result is selected from the position to the end of the data section, and the equalization result selection process is terminated. Further, when the RSSI minimum position is located in the next frame, a position that is 1/3 data section length back from the end of the data section is set as a switching position, and a forward equalization result is selected from the beginning of the data section to the switching position, and the switching position To the end of the data section, the reverse equalization result is selected, and the equalization result selection process is completed.

次に、上述した等化結果選択処理の様子について説明する。まず、図7に示したST302の等化結果選択処理の様子を図8に示す。図8(a)はRSSI最小値が閾値1未満であり、RSSI最小位置が現フレームに位置する場合の様子を示し、図8(b)はRSSI最小値が閾値1未満であり、RSSI最小位置が次フレームに位置する場合の様子を示す。図8に示すように、図8(a)では、現フレームの全てについて逆方向等化を選択し、図8(b)では、現フレームの全てについて順方向等化結果を選択する。   Next, the above-described equalization result selection process will be described. First, FIG. 8 shows a state of the equalization result selection process of ST302 shown in FIG. FIG. 8A shows a state where the RSSI minimum value is less than the threshold 1 and the RSSI minimum position is located in the current frame, and FIG. 8B shows that the RSSI minimum value is less than the threshold 1 and the RSSI minimum position. Shows the state when is located in the next frame. As shown in FIG. 8, reverse equalization is selected for all current frames in FIG. 8 (a), and forward equalization results are selected for all current frames in FIG. 8 (b).

次に、図7に示したST305の等化結果選択処理の様子を図9に示す。図9(a)はRSSI最小値が閾値1以上かつ閾値2未満であり、RSSI最小位置が現フレームに位置する場合の様子を示し、図9(b)はRSSI最小値が閾値1以上かつ閾値2未満であり、RSSI最小位置が次フレームに位置する場合の様子を示す。図9に示すように、図9(a)では、データ区間先頭から1/3データ区間長離れた位置を切替位置とし、データ区間先頭から切替位置までは順方向等化結果を選択し、切替位置からデータ区間末尾までは逆方向等化結果を選択する。図9(b)では、データ区間末尾から1/3データ区間長遡った位置を切替位置とし、データ区間先頭から切替位置までは順方向等化結果を選択し、切替位置からデータ区間末尾までは逆方向等化結果を選択する。   Next, FIG. 9 shows the state of the equalization result selection process of ST305 shown in FIG. FIG. 9A shows a state where the RSSI minimum value is greater than or equal to threshold 1 and less than threshold 2, and the RSSI minimum position is located in the current frame. FIG. 9B shows that the RSSI minimum value is greater than or equal to threshold 1 and the threshold. It is less than 2 and shows the situation when the RSSI minimum position is located in the next frame. As shown in FIG. 9, in FIG. 9A, a position that is 1/3 data section length away from the head of the data section is set as a switching position, and a forward equalization result is selected and switched from the head of the data section to the switching position. The reverse equalization result is selected from the position to the end of the data section. In FIG. 9B, the position that is 1/3 data section length from the end of the data section is set as the switching position, the forward equalization result is selected from the beginning of the data section to the switching position, and the position from the switching position to the end of the data section is selected. Select the reverse equalization result.

最後に、図7に示したST304の等化結果選択処理の様子を図10に示す。図10(a)はRSSI最小値が閾値2以上であり、RSSI最小位置が現フレームに位置する場合の様子を示し、図10(b)はRSSI最小値が閾値2以上であり、RSSI最小位置が次フレームに位置する場合の様子を示す。図10(a)及び図10(b)に示すように、データ区間先頭から中心までは順方向等化結果を選択し、中心からデータ区間末尾までは逆方向等化結果を選択する。   Finally, FIG. 10 shows the state of the equalization result selection process of ST304 shown in FIG. FIG. 10A shows a state where the RSSI minimum value is equal to or greater than the threshold 2 and the RSSI minimum position is located in the current frame. FIG. 10B illustrates that the RSSI minimum value is equal to or greater than the threshold 2 and the RSSI minimum position. Shows the state when is located in the next frame. As shown in FIGS. 10A and 10B, the forward equalization result is selected from the beginning of the data section to the center, and the reverse equalization result is selected from the center to the end of the data section.

2.3.実施の形態2の効果
このように、実施の形態2によれば、RSSI最小位置が同期ワード区間に位置する場合において、RSSI最小値と2つの閾値との閾値判定結果に基づいて、順方向等化結果又は逆方向等化結果の選択を切り替える切替位置を変更する。これにより、トレーニングの信頼性の高い等化結果をより正確に選択することができるので、等化性能を向上させることができる。
2.3. As described above, according to the second embodiment, when the RSSI minimum position is located in the synchronization word section, based on the threshold determination result between the RSSI minimum value and the two threshold values, the forward direction, etc. The switching position for switching the selection of the equalization result or the reverse direction equalization result is changed. Thereby, since the equalization result with high training reliability can be selected more accurately, the equalization performance can be improved.

なお、本実施の形態では、2つの閾値を設ける場合について説明したが、本発明はこれに限らず、大きさの異なる3つ以上の閾値を設けてもよい。また、RSSI最小値が閾値1以上かつ閾値2未満であった場合、データ区間先頭から1/3データ区間長離れた位置、あるいはデータ区間末尾から1/3データ区間長遡った位置を切替位置としているが、もちろんそれ以外の値、例えば1/4データ区間長であってもよい。   In this embodiment, the case where two threshold values are provided has been described. However, the present invention is not limited to this, and three or more threshold values having different sizes may be provided. When the RSSI minimum value is not less than the threshold value 1 and less than the threshold value 2, a position that is 1/3 data section length away from the head of the data section or a position that is 1/3 data section length back from the end of the data section is used as the switching position. Of course, other values such as a quarter data interval length may be used.

なお、上記各実施の形態では、シンボル毎の瞬時RSSIを用いるように説明したが、マルチパスフェージング環境ではシンボル毎の瞬時RSSIは激しく変動するため、RSSI最小値のシンボル位置がずれてしまい、選択される等化方向が切り替わってしまう可能性がある。そこで、RSSIは、算出するシンボルの前後数シンボルの平均値としてもよい。   In each of the above embodiments, the instantaneous RSSI for each symbol has been described. However, since the instantaneous RSSI for each symbol fluctuates significantly in a multipath fading environment, the symbol position of the RSSI minimum value shifts and is selected. There is a possibility that the equalization direction is switched. Therefore, RSSI may be an average value of several symbols before and after the calculated symbol.

また、等化処理を行う前にRSSIを算出することができるので、等化結果選択処理の判定基準にRSSIを用いることにより、例えば、RSSI最小値が現フレームの同期ワード区間に位置し、かつ、RSSI最小値が閾値未満の場合、順方向等化結果は破棄されるため、順方向等化を行わないようにすれば、処理量を削減することができる。   Further, since RSSI can be calculated before performing equalization processing, by using RSSI as a criterion for equalization result selection processing, for example, the RSSI minimum value is located in the synchronization word section of the current frame, and When the RSSI minimum value is less than the threshold value, the forward equalization result is discarded. Therefore, if the forward equalization is not performed, the processing amount can be reduced.

また、上記各実施の形態では、トレーニングに用いる系列を同期ワードとして説明したが、本発明はこれに限らず、パイロット信号などの既知信号であればよい。   In each of the above embodiments, the sequence used for training has been described as a synchronization word. However, the present invention is not limited to this, and any known signal such as a pilot signal may be used.

本発明にかかる等化装置及び等化方法は、例えば、無線通信装置等に適用できる。   The equalization apparatus and equalization method according to the present invention can be applied to, for example, a wireless communication apparatus.

101 受信信号バッファ
102 順方向等化処理部
103 順方向等化バッファ
104 逆方向等化処理部
105 逆方向等化バッファ
106 RSSI測定部
107 RSSI最小位置判定部
108 RSSI比較部
109 等化結果選択部
DESCRIPTION OF SYMBOLS 101 Reception signal buffer 102 Forward equalization processing part 103 Forward equalization buffer 104 Reverse direction equalization processing part 105 Reverse direction equalization buffer 106 RSSI measurement part 107 RSSI minimum position determination part 108 RSSI comparison part 109 Equalization result selection part

Claims (4)

現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化手段と、
次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化手段と、
受信信号の受信信号強度を測定する受信信号強度測定手段と、
前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定手段と、
検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較手段と、
検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択手段と、
を具備し、
前記等化結果選択手段は、
前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、
前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、
前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値以上の場合、データ区間先頭からデータ区間中心までは順方向等結果を選択し、データ区間中心からデータ区間末尾までは逆方向等化結果を選択することを特徴とする等化装置。
Forward equalization means for performing training in the forward direction using a known signal arranged at the head of the current frame, tracking the data section of the current frame in the forward direction, and obtaining a forward equalization result;
Training in the reverse direction using a known signal arranged at the beginning of the next frame, and performing reverse equalization by tracking in the reverse direction for the data section of the current frame;
Received signal strength measuring means for measuring the received signal strength of the received signal;
Among the received signal strengths measured in a section from the known signal of the current frame to the known signal of the next frame, reception for detecting a minimum received signal strength and a position that becomes the minimum received signal strength. Signal strength minimum position determination means;
A comparing means for performing a threshold determination between the detected minimum received signal strength and a predetermined threshold;
An equalization result selection means for selecting the forward equalization result or the reverse equalization result based on the detected position of the minimum received signal strength and the result of the threshold determination;
Comprising
The equalization result selection means includes:
If the minimum received signal strength is detected in the known signal section of the current frame and the detected minimum received signal strength is less than the threshold, select a reverse equalization result;
If the minimum received signal strength is detected in the known signal section of the next frame and the detected minimum received signal strength is less than the threshold, select a forward equalization result;
When the minimum received signal strength is detected in the known signal section, and the detected minimum received signal strength is equal to or greater than the threshold, a result such as a forward direction is selected from the beginning of the data section to the center of the data section, An equalizer for selecting a reverse equalization result from the center of a data section to the end of the data section.
現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化手段と、
次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化手段と、
受信信号の受信信号強度を測定する受信信号強度測定手段と、
前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定手段と、
検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較手段と、
検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択手段と、
を具備し、
前記等化結果選択手段は、
前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、
前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、
データ区間前半において前記最小の受信信号強度が検出された場合には、前記最小の受信信号強度となる位置にオフセット量nを加算した位置を切替位置とし、データ区間後半において前記最小の受信信号強度が検出された場合には、前記最小の受信信号強度となる位置からオフセット量nを減算した位置を切替位置とし、データ区間先頭から前記切替位置までは順方向等化結果を選択し、前記切替位置からデータ区間末尾までは逆方向等化結果を選択することを特徴とする等化装置。
Forward equalization means for performing training in the forward direction using a known signal arranged at the head of the current frame, tracking the data section of the current frame in the forward direction, and obtaining a forward equalization result;
Training in the reverse direction using a known signal arranged at the beginning of the next frame, and performing reverse equalization by tracking in the reverse direction for the data section of the current frame;
Received signal strength measuring means for measuring the received signal strength of the received signal;
Among the received signal strengths measured in a section from the known signal of the current frame to the known signal of the next frame, reception for detecting a minimum received signal strength and a position that becomes the minimum received signal strength. Signal strength minimum position determination means;
A comparing means for performing a threshold determination between the detected minimum received signal strength and a predetermined threshold;
An equalization result selection means for selecting the forward equalization result or the reverse equalization result based on the detected position of the minimum received signal strength and the result of the threshold determination;
Comprising
The equalization result selection means includes:
If the minimum received signal strength is detected in the known signal section of the current frame and the detected minimum received signal strength is less than the threshold, select a reverse equalization result;
If the minimum received signal strength is detected in the known signal section of the next frame and the detected minimum received signal strength is less than the threshold, select a forward equalization result;
When the minimum received signal strength is detected in the first half of the data interval, a position obtained by adding the offset amount n to the position that becomes the minimum received signal strength is set as a switching position, and the minimum received signal strength is set in the second half of the data interval. Is detected, the position obtained by subtracting the offset amount n from the position having the minimum received signal strength is set as the switching position, the forward equalization result is selected from the beginning of the data section to the switching position, and the switching is performed. An equalizer for selecting a reverse equalization result from a position to the end of a data section.
現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化工程と、
次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化工程と、
受信信号の受信信号強度を測定する受信信号強度測定工程と、
前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定工程と、
検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較工程と、
検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択工程と、
を具備し、
前記等化結果選択工程は、
前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、
前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、
前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値以上の場合、データ区間先頭からデータ区間中心までは順方向等結果を選択し、データ区間中心からデータ区間末尾までは逆方向等化結果を選択することを特徴とする等化方法。
A forward equalization step of performing training in the forward direction using a known signal arranged at the head of the current frame, tracking the data section of the current frame in the forward direction, and obtaining a forward equalization result;
Training in the reverse direction using a known signal arranged at the beginning of the next frame, and performing a reverse equalization step of tracking in the reverse direction for the data section of the current frame to obtain a reverse equalization result;
A received signal strength measuring step for measuring the received signal strength of the received signal;
Among the received signal strengths measured in a section from the known signal of the current frame to the known signal of the next frame, reception for detecting a minimum received signal strength and a position that becomes the minimum received signal strength. A signal strength minimum position determination step;
A comparison step of performing a threshold determination between the detected minimum received signal strength and a predetermined threshold;
An equalization result selection step of selecting the forward equalization result or the reverse equalization result based on the detected position of the minimum received signal strength and the result of the threshold determination;
Comprising
The equalization result selection step includes
If the minimum received signal strength is detected in the known signal section of the current frame and the detected minimum received signal strength is less than the threshold, select a reverse equalization result;
If the minimum received signal strength is detected in the known signal section of the next frame and the detected minimum received signal strength is less than the threshold, select a forward equalization result;
When the minimum received signal strength is detected in the known signal section, and the detected minimum received signal strength is equal to or greater than the threshold, a result such as a forward direction is selected from the beginning of the data section to the center of the data section, An equalization method comprising selecting a reverse equalization result from the center of a data section to the end of the data section.
現フレーム先頭に配置された既知信号を用いて順方向にトレーニングを行い、前記現フレームのデータ区間について順方向にトラッキングを行って順方向等化結果を得る順方向等化工程と、
次フレーム先頭に配置された既知信号を用いて逆方向にトレーニングを行い、前記現フレームのデータ区間について逆方向にトラッキングを行って逆方向等化結果を得る逆方向等化工程と、
受信信号の受信信号強度を測定する受信信号強度測定工程と、
前記現フレームの前記既知信号から前記次フレームの前記既知信号までの区間において測定された前記受信信号強度のうち、最小の受信信号強度、及び、当該最小の受信信号強度となる位置を検出する受信信号強度最小位置判定工程と、
検出された前記最小の受信信号強度と、所定の閾値との閾値判定を行う比較工程と、
検出された前記最小の受信信号強度となる位置及び前記閾値判定の結果に基づいて、前記順方向等化結果又は前記逆方向等化結果を選択する等化結果選択工程と、
を具備し、
前記等化結果選択工程は、
前記現フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、逆方向等化結果を選択し、
前記次フレームの前記既知信号区間において前記最小の受信信号強度が検出され、かつ、検出された前記最小の受信信号強度が前記閾値未満の場合、順方向等化結果を選択し、
データ区間前半において前記最小の受信信号強度が検出された場合には、前記最小の受信信号強度となる位置にオフセット量nを加算した位置を切替位置とし、データ区間後半において前記最小の受信信号強度が検出された場合には、前記最小の受信信号強度となる位置からオフセット量nを減算した位置を切替位置とし、データ区間先頭から前記切替位置までは順方向等化結果を選択し、前記切替位置からデータ区間末尾までは逆方向等化結果を選択することを特徴とする等化方法。
A forward equalization step of performing training in the forward direction using a known signal arranged at the head of the current frame, tracking the data section of the current frame in the forward direction, and obtaining a forward equalization result;
Training in the reverse direction using a known signal arranged at the beginning of the next frame, and performing a reverse equalization step of tracking in the reverse direction for the data section of the current frame to obtain a reverse equalization result;
A received signal strength measuring step for measuring the received signal strength of the received signal;
Among the received signal strengths measured in a section from the known signal of the current frame to the known signal of the next frame, reception for detecting a minimum received signal strength and a position that becomes the minimum received signal strength. A signal strength minimum position determination step;
A comparison step of performing a threshold determination between the detected minimum received signal strength and a predetermined threshold;
An equalization result selection step of selecting the forward equalization result or the reverse equalization result based on the detected position of the minimum received signal strength and the result of the threshold determination;
Comprising
The equalization result selection step includes
If the minimum received signal strength is detected in the known signal section of the current frame and the detected minimum received signal strength is less than the threshold, select a reverse equalization result;
If the minimum received signal strength is detected in the known signal section of the next frame and the detected minimum received signal strength is less than the threshold, select a forward equalization result;
When the minimum received signal strength is detected in the first half of the data interval, a position obtained by adding the offset amount n to the position that becomes the minimum received signal strength is set as a switching position, and the minimum received signal strength is set in the second half of the data interval. Is detected, the position obtained by subtracting the offset amount n from the position having the minimum received signal strength is set as the switching position, the forward equalization result is selected from the beginning of the data section to the switching position, and the switching is performed. An equalization method comprising selecting a reverse equalization result from a position to the end of a data section.
JP2011016589A 2011-01-28 2011-01-28 Equalizer and equalization method Expired - Fee Related JP4832601B1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04274611A (en) * 1991-03-01 1992-09-30 Toshiba Corp Equalizing system
JPH05308252A (en) * 1992-04-28 1993-11-19 Japan Radio Co Ltd Equalizer
JPH088794A (en) * 1994-06-23 1996-01-12 Toshiba Corp Bidirectional maximum likelihood series estimation system
JPH0856185A (en) * 1993-08-17 1996-02-27 Sharp Corp Equalization of digitally codeo signal to be transmitted by means of non-adjoing time slot
JP2000295147A (en) * 1999-04-05 2000-10-20 Matsushita Electric Ind Co Ltd Waveform equalizer, mobile radio equipment using the same, base station radio equipment and mobile communication system
JP2008042421A (en) * 2006-08-04 2008-02-21 Hitachi Kokusai Electric Inc Communication system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04274611A (en) * 1991-03-01 1992-09-30 Toshiba Corp Equalizing system
JPH05308252A (en) * 1992-04-28 1993-11-19 Japan Radio Co Ltd Equalizer
JPH0856185A (en) * 1993-08-17 1996-02-27 Sharp Corp Equalization of digitally codeo signal to be transmitted by means of non-adjoing time slot
JPH088794A (en) * 1994-06-23 1996-01-12 Toshiba Corp Bidirectional maximum likelihood series estimation system
JP2000295147A (en) * 1999-04-05 2000-10-20 Matsushita Electric Ind Co Ltd Waveform equalizer, mobile radio equipment using the same, base station radio equipment and mobile communication system
JP2008042421A (en) * 2006-08-04 2008-02-21 Hitachi Kokusai Electric Inc Communication system

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