JP2003134082A5 - Decoding device, demodulation decoding device, receiving device and decoding method - Google Patents
Decoding device, demodulation decoding device, receiving device and decoding method Download PDFInfo
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Description
【００３４】
【課題を解決するための手段】
上述の目的を達成するため、この発明に係る復号装置は、受信信号を復調する際に検出される受信電力レベル情報を用いて、受信信号に対応するメトリックデータに重み付け処理を行う復号装置であって、受信電力レベル情報を所定倍率で増大させて出力する電力レベル増大回路を備え、該電力レベル増大回路から出力された受信電力レベル情報に基づいて重み付け処理を行うことを特徴とする。
0034
[Means for solving problems]
To achieve the above object, a decoding apparatus according to the present invention, by using the received power level information detected in demodulating the received signal, it intends row weighting processing to the corresponding metric data to the reception signal decrypt device a is, to increase the received power level information at a predetermined magnification with a power level increased circuit that outputs, you and performs weighting processing on the basis of the received power level information outputted from said power level increased circuit ..
本実施の形態では、上記のように構成し、動作させることにより、システムにおける伝送信号パラメータに変更が生じる場合でも、電力レベル制限回路１３と電力レベル増大回路１４の各制御値を適切に変更できるので、メトリック値の中間値が連続することを減少させることができ、結果的に、ＢＥＲ値（受信性能）を向上させることができる。
また、本実施の形態では、受信するキャリア変調方式や符号化率等の、システムの伝送信号パラメータ情報を検出する伝送方式検出回路を設け、その検出結果をもとに、電力レベル制限回路と電力レベル増大回路の制御を行う機能を設けたので、受信する実際の伝送信号パラメータを検出でき、例えば、あらかじめ伝送信号パラメータ毎に最適な電力制限値と電力倍率値を決めておくことで、検出した伝送信号方式毎に最適な制御を行うことが可能となり、各種伝送信号方式毎に最適な受信性能を得ることができる。
In the present embodiment, by configuring and operating as described above, the control values of the power level limiting circuit 13 and the power level increasing circuit 14 can be appropriately changed even when the transmission signal parameters in the system are changed. Therefore, it is possible to reduce the continuity of the intermediate values of the metric values, and as a result, the BER value (reception performance) can be improved.
Further, in the present embodiment, a transmission method detection circuit for detecting transmission signal parameter information of the system such as a carrier modulation method and a coding rate to be received is provided, and based on the detection result, a power level limiting circuit and power are provided. Since the function to control the level increase circuit is provided, the actual transmission signal parameter to be received can be detected. For example, it is detected by determining the optimum power limit value and power magnification value for each transmission signal parameter in advance. Optimal control can be performed for each transmission signal system, and optimum reception performance can be obtained for each various transmission signal system.
このように本実施の形態では、ＣＰＵ等の制御手段を用いてＢＥＲ検出回路１６の出力を監視し、ＢＥＲ値が最も小さくなる（最も誤りが少なくなる）ように、電力レベル制限回路１３と電力レベル増大回路１４の各設定値を適切にフィードバック制御する。この制御により、本実施の形態では、受信環境が変化する環境においてもその受信環境の変化に適応的に対応できるので、良好な受信性能を維持することができる。なお、フィードバック制御の方法としては、多数の方法が知られており、本実施の形態では、その中から任意の方法を用いることができる。
また、本実施の形態では、ビタビ復号処理後のビットエラーレート値を検出するＢＥＲ検出回路を設け、その検出結果をもとに、電力レベル制限回路と電力レベル増大回路の制御を行う機能を設けたので、受信する実際の伝送環境（ＢＥＲ値による受信性能）を検出でき、その検出結果をもとに上記両処理回路の制御を行うことで、受信環境が変化する場合でも柔軟に最適な受信性能を得ることができる。
As described above, in the present embodiment, the output of the BER detection circuit 16 is monitored by using a control means such as a CPU, and the power level limiting circuit 13 and the power are used so that the BER value is the smallest (the least error is minimized). Each set value of the level increasing circuit 14 is appropriately feedback-controlled. With this control, in the present embodiment, even in an environment where the reception environment changes, it is possible to adaptively respond to the change in the reception environment, so that good reception performance can be maintained. A large number of methods are known as feedback control methods, and in the present embodiment, any method can be used from among them.
Further, in the present embodiment, a BER detection circuit for detecting the bit error rate value after the bit error rate processing is provided, and a function for controlling the power level limiting circuit and the power level increasing circuit is provided based on the detection result. Therefore, the actual transmission environment (reception performance based on the BER value) to be received can be detected, and by controlling both of the above processing circuits based on the detection result, the optimum reception can be flexibly performed even if the reception environment changes. Performance can be obtained.
具体的には、ＢＥＲ検出回路１６において、検出したＢＥＲ値をＣＰＵからリードできるようなレジスタを設け、ＣＰＵがそれを監視することで行う方法等が考えられる。
このように本実施の形態では、システムの伝送信号パラメータと受信環境の両方を切り替える動作を行うことにより、受信環境が変化する環境においても、ビタビ復号後のＢＥＲ値を改善でき、良好な受信性能を維持することができる。
また、本実施の形態では、伝送方式検出回路とＢＥＲ検出回路の両方を設け、通常は伝送方式検出回路で検出されたシステムの伝送信号パラメータ等の内容により、電力レベル制限回路と電力レベル増大回路の選択的制御を行い、ＢＥＲ検出回路の検出内容如何によっては、電力レベル制限回路と電力レベル増大回路の制御内容に修正を加える機能を設けたので、受信する実際の伝送信号パラメータと、受信環境を同時に検出でき、伝送信号方式が切り替わり、なおかつ受信環境が時間的に変化しても柔軟に最適な受信性能を得ることができる。
Specifically, in the BER detection circuit 16, a method is conceivable in which a register is provided so that the detected BER value can be read from the CPU, and the CPU monitors the register.
As described above, in the present embodiment, by performing the operation of switching both the transmission signal parameter of the system and the reception environment, the BER value after the Viterbi decoding can be improved even in an environment where the reception environment changes, and good reception performance is achieved. Can be maintained.
Further, in the present embodiment, both a transmission method detection circuit and a BER detection circuit are provided, and a power level limiting circuit and a power level increasing circuit are usually provided according to the contents of the transmission signal parameters of the system detected by the transmission method detection circuit. Since the function to modify the control contents of the power level limiting circuit and the power level increasing circuit is provided depending on the detection contents of the BER detection circuit, the actual transmission signal parameters to be received and the reception environment are provided. Can be detected at the same time, the transmission signal method is switched, and the optimum reception performance can be flexibly obtained even if the reception environment changes with time.
このように本実施の形態では、電力レベル情報を発生させるために非線型変換特性を持つテーブルを採用したことにより、復調されたパイロット信号の電力が非常に小さい時、すなわち復調信号の信頼度が低い時には、一次曲線を使ったリニア変換テーブルを用いた電力レベル情報に比べて発生する電力レベル情報を“０”に偏らせることができ、それにより、信頼度の低い復調信号のメトリック値については‘０’と‘１’の中間値とすることができるので、信頼度が低い復調信号が復号されることによるビタビ復号への悪影響を改善することができる。また、上記した各実施の形態と同様に、正規化レベル未満であっても信頼度を有する復調信号については有効活用できるので、ビタビデコーダの誤り訂正能力を改善することができる。また、本実施の形態の非線形変換特性は、実施の形態４の各種制御と組み合わせて用いることができることから、ビタビ復号におけるＢＥＲ等の受信性能をさらに向上させることができる。例えば、本実施形態では、システムの伝送信号パラメータと受信環境の双方が変動する環境下においても、ビタビ復号後の受信性能を向上させることが可能になる。
また、本実施の形態では、非線型特性を持つ電力レベル情報を発生させるための電力レベル発生用非線形変換テーブルを設け、変換後の出力に対して、電力レベル制限回路と電力レベル増大回路の制御を行い、非線形化された電力レベル情報によって重み付けをした多値メトリックを使用する機能を設けたので、復調パイロット信号が小さい時、すなわち復調信号の信頼度が低いデータの時に、一次曲線を使ったリニア変換テーブルを用いた線形的電力レベル情報に比べて、発生する電力レベル情報を０に偏らせ、信頼度の低い復調信号のメトリック値を‘０’と‘１’の中間値とすることができ、信頼度が低いと思われる復調信号によるビタビ復号への影響が最小限となり、信頼度のある復調信号をより有効に使用することで、ビタビデコーダの誤り訂正能力をさらに改善できる。
As described above, in the present embodiment, by adopting a table having non-linear conversion characteristics to generate power level information, when the power of the demodulated pilot signal is very small, that is, the reliability of the demodulated signal is increased. When it is low, the generated power level information can be biased to "0" compared to the power level information using the linear conversion table using the linear conversion table, so that the metric value of the demodulated signal with low reliability can be biased. Since it can be set to an intermediate value between '0' and '1', it is possible to improve the adverse effect on the bitabi decoding due to the decoding of the demodulated signal having low reliability. Further, as in each of the above-described embodiments, the demodulated signal having reliability even if it is lower than the normalization level can be effectively used, so that the error correction capability of the Viterbi decoder can be improved. Further, since the non-linear conversion characteristic of the present embodiment can be used in combination with the various controls of the fourth embodiment, the reception performance of BER or the like in the Viterbi decoding can be further improved. For example, in the present embodiment, it is possible to improve the reception performance after Viterbi decoding even in an environment in which both the transmission signal parameters of the system and the reception environment fluctuate.
Further, in the present embodiment, a non-linear conversion table for generating a power level for generating power level information having a non-linear characteristic is provided, and a power level limiting circuit and a power level increasing circuit are controlled for the output after conversion. And provided a function to use a multi-valued metric weighted by delinearized power level information, so a linear curve was used when the demodulated pilot signal was small, that is, when the demodulated signal was unreliable. Compared to the linear power level information using the linear conversion table, the generated power level information can be biased to 0, and the metric value of the demodulated signal with low reliability can be set to an intermediate value between '0' and '1'. The effect of the demodulated signal, which is considered to be low in reliability, on the bitabi decoding is minimized, and the error correction ability of the bitabi decoder can be further improved by using the demodulated signal with reliability more effectively.
このように本実施形態では、複数テーブル選択回路１９で複数の変換特性を持つ電力レベル発生用非線型複数変換テーブル１８から最適な変換特性を選択する制御と、実施の形態４において行われた各種制御を同時に行うことができるので、ビタビデコーダにおける誤り訂正能力を上記した各実施の形態よりもさらに改善させることができる。
また、本実施の形態では、受信信号を復調した時の電力レベル情報を発生する為の変換特性を複数持つ電力レベル発生用複数非線形変換テーブルを備え、伝送方式検出回路とＢＥＲ検出回路の結果から、電力レベル制限回路と電力レベル増大回路の制御と同時に、受信したデータの誤り訂正能力が高くなるように、複数種のテーブルを切り替える制御機能を設けたので、伝送方式検出回路の出力によって判断可能な、システムの伝送信号方式や、ＢＥＲ検出回路の出力によって判断可能な、受信環境の両方が切り替わる様々な環境下において、最適な非線形変換テーブルを用いることができ、電力制限及び電力倍率の制御と、最適な特性を持つ電力レベル発生用非線型複数変換テーブルの制御とを同時に行うことで、ビタビデコーダの誤り訂正能力をさらに改善させることができる。
As described above, in the present embodiment, the control for selecting the optimum conversion characteristics from the power level generating non-linear multiple conversion tables 18 having a plurality of conversion characteristics in the plurality of table selection circuits 19, and the various types performed in the fourth embodiment. Since the control can be performed at the same time, the error correction capability of the Viterbi decoder can be further improved as compared with each of the above-described embodiments.
Further, in the present embodiment, a plurality of non-linear conversion tables for power level generation having a plurality of conversion characteristics for generating power level information when the received signal is demodulated are provided, and the results of the transmission method detection circuit and the BER detection circuit are used. At the same time as controlling the power level limiting circuit and power level increasing circuit, a control function that switches between multiple types of tables is provided so that the error correction capability of the received data is high, so it can be judged by the output of the transmission method detection circuit. In addition, the optimum nonlinear conversion table can be used in various environments where both the reception environment can be switched, which can be judged by the transmission signal system of the system and the output of the BER detection circuit. By simultaneously controlling the non-linear multiple conversion table for power level generation with optimum characteristics, the error correction capability of the Vitabi decoder can be further improved.
従って、本実施の形態では、実施の形態６における電力変換特性が書き込まれた複数の固定テーブルをサポートする構成から、変換特性が自由にリード／ライトできる汎用メモリを使ったＲＡＭに変更されているので、任意のタイミングで受信環境に最適な変換特性を有する電力レベル情報を、柔軟に使用してメトリック値に重み付けすることができる。その結果、ビタビ復号に用いられるメトリック値が、受信環境に応じてさらに細かく制御された電力レベル情報によって最適に重み付けられるため、ビタビデコーダの誤り訂正能力をさらに改善できる。
また、本実施の形態では、受信信号を復調した時の電力レベル情報を発生する為の変換特性を持つテーブルを、汎用メモリ等によって構成し、ＣＰＵ等の外部からメモリ（テーブル）内容を書き換え、変換特性を任意に変更する機能を設け、電力変換特性が書き込まれた複数の固定テーブルをサポートする構成から、変換特性が自由にリード／ライトできる汎用メモリを使ったテーブルに変更しているので、任意のタイミングで受信環境に最適な任意の変換特性を持たせた電力レベル情報を、選択ではなくて柔軟に発生でき、受信環境に応じてビタビデコーダの誤り訂正能力をさらに柔軟に改善できる。また、複数のテーブルを１つの汎用メモリに置き換えて実施できることから、軟判定ビタビ復号装置の回路規模を小さくすることが可能となり、復号装置の回路コストを低減させることができる。
Therefore, in the present embodiment, the configuration that supports a plurality of fixed tables in which the power conversion characteristics of the sixth embodiment are written is changed to a RAM that uses a general-purpose memory whose conversion characteristics can be freely read / written. Therefore, the power level information having the optimum conversion characteristics for the receiving environment can be flexibly used at any timing to weight the metric value. As a result, the metric value used for the Viterbi decoding is optimally weighted by the power level information that is finely controlled according to the reception environment, so that the error correction capability of the Viterbi decoder can be further improved.
Further, in the present embodiment, a table having conversion characteristics for generating power level information when the received signal is demodulated is configured by a general-purpose memory or the like, and the memory (table) contents are rewritten from the outside such as a CPU. Since the configuration that provides a function to arbitrarily change the conversion characteristics and supports multiple fixed tables in which the power conversion characteristics are written is changed to a table that uses a general-purpose memory that can freely read / write the conversion characteristics. Power level information with arbitrary conversion characteristics that is optimal for the reception environment can be generated flexibly at any timing, rather than being selected, and the error correction capability of the Viterbi decoder can be further flexibly improved according to the reception environment. Further, since a plurality of tables can be replaced with one general-purpose memory, the circuit scale of the soft determination Viterbi decoding apparatus can be reduced, and the circuit cost of the decoding apparatus can be reduced.
このように本実施の形態では、ＣＰＵ等の外部の制御手段を用いてＲＡＭを制御し、電力レベル情報を発生させると共に、電力レベルの制限値を変更する機能および電力レベル増大させる電力倍率を変更する機能を持たせることができるたので、上記した他の実施の形態では必要であった電力レベル制限回路と電力レベル増大回路を削減することができ、回路規模を縮小させることができる。
また、本実施の形態では、電力レベル情報を発生する為の変換特性を持つテーブルを、ＲＡＭ等の汎用メモリで構成する方式にし、ＲＡＭに非線形変換特性を与える機能だけでなく、電力倍率や電力制限値を変更する機能も持たせたので、電力レベル制限回路と、電力レベル増大回路の機能をＲＡＭに代用させることができ、軟判定ビタビ復号装置の回路規模をさらに小さくすることが可能となり、復号装置の回路コストを低減させることができる。
As described above, in the present embodiment, the RAM is controlled by using an external control means such as a CPU to generate power level information, and the function of changing the power level limit value and the power ratio for increasing the power level are changed. Since it is possible to provide the function of performing the power level, it is possible to reduce the power level limiting circuit and the power level increasing circuit required in the other embodiments described above, and it is possible to reduce the circuit scale.
Further, in the present embodiment, a table having conversion characteristics for generating power level information is configured by a general-purpose memory such as RAM, and not only a function of giving non-linear conversion characteristics to RAM, but also power magnification and power. Since the function to change the limit value is also provided, the functions of the power level limiting circuit and the power level increasing circuit can be substituted for RAM, and the circuit scale of the soft judgment bitabi decoding device can be further reduced. The circuit cost of the decoding device can be reduced.
【０１４９】
【発明の効果】
この発明の復号装置によれば、様々な伝送信号パラメータの変化や、受信環境によって変化する入力電力レベル情報に応じて、メトリック値の中間値情報量を調整することが可能となる。よって、ビタビ復号時に最も誤り率を小さくする電力レベル情報に変換できる。従って、受信性能を向上させることができる。
[0149]
【Effect of the invention】
According to the decoding device of the present invention, changes in the various transmission signal parameters, depending on the input power level information that varies with the reception environment, possible to adjust the intermediate value information of the metric value that Do. Therefore, it can be converted into power level information that minimizes the error rate at the time of Viterbi decoding. Therefore, the reception performance can be improved.
Claims (9)
前記受信電力レベル情報を所定倍率で増大させて出力する電力レベル増大回路を備え、
該電力レベル増大回路から出力された受信電力レベル情報に基づいて前記重み付け処理を行うことを特徴とする復号装置。By using the received power level information detected in demodulating the received signal, a decrypt unit intends row weighting processing to the metric data corresponding to the received signal,
A power level increasing circuit for increasing the received power level information by a predetermined factor and outputting the information;
Decrypt apparatus you and performing the weighting processing based on the received power level information outputted from said power level increased circuit.
前記電力レベル増大回路は、前記電力レベル制限回路において所定値以下にされた前記電力レベル情報を所定倍率で増大させることを特徴とする請求項１記載の復号装置。It further comprises a power level limiting circuit for reducing the received power level information to a predetermined value or less,
The power level increases circuit decrypt apparatus according to claim 1, wherein the increasing the power level information to a predetermined value or less at the power level limiting circuit with a predetermined magnification.
前記電力レベル増大回路は、前記伝送方式検出回路の出力に基づいて前記所定倍率を設定することを特徴とする請求項１記載の復号装置。It further comprises a transmission scheme detection circuit for detecting a transmission scheme corresponding to the received signal,
The power level increases circuit, the transmission method decrypt apparatus according to claim 1, wherein the setting the predetermined ratio based on the output of the detection circuit.
前記電力レベル制限回路は、前記伝送方式検出回路の出力に基づいて前記所定値を設定し、
前記電力レベル増大回路は、前記伝送方式検出回路の出力に基づいて前記所定倍率を設定することを特徴とする請求項２記載の復号装置。It further comprises a transmission scheme detection circuit for detecting a transmission scheme corresponding to the received signal,
The power level limiting circuit sets the predetermined value based on an output of the transmission scheme detection circuit,
The power level increases circuit, the transmission method decrypt apparatus according to claim 2, wherein the setting the predetermined ratio based on the output of the detection circuit.
請求項１ないし５のいずれかに記載の復号装置とを備え、A decoding apparatus according to any one of claims 1 to 5, comprising:
前記変換テーブルは、The conversion table is
前記第１の受信電力レベル情報が所定の値以上の場合には、前記第１の受信電力レベル情報と非線形の関係にあって、前記第１の受信電力レベル情報と線形関係にある値よりも小さい値に対応する前記第２の受信電力レベル情報を出力し、When the first received power level information is equal to or higher than a predetermined value, it is in a non-linear relationship with the first received power level information, and is more than a value in a linear relationship with the first received power level information. Outputting the second received power level information corresponding to a small value;
前記第１の受信電力レベル情報が前記所定の値より小さい場合には、前記第２の受信電力レベル情報を略０として出力し、When the first received power level information is smaller than the predetermined value, the second received power level information is output as approximately 0,
前記復号装置は、第２の受信電力レベル情報を用いて、前記受信信号に対応するメトリックデータに重み付け処理を行うように構成されてなる復調復号装置。The demodulation and decoding apparatus, wherein the decoding apparatus is configured to perform weighting processing on metric data corresponding to the received signal using second received power level information.
前記受信電力レベル情報を所定倍率で増大させた結果に基づいて前記重み付け処理を行うことを特徴とする復号方法。By using the received power level information detected in demodulating the received signal, a weighting processing to the metric data corresponding to said received signal a decrypt method intends row,
Decrypt how to and performing the weighting process based on the results of the reception power level information increased by a predetermined magnification.
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| EP2461532A2 (en) * | 2009-07-31 | 2012-06-06 | Hong Seok Seo | Method for processing a received signal to which channel state information is applied in an orthogonal frequency-division multiplexing system |
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