JP3185378B2 - Data receiving device - Google Patents
Data receiving deviceInfo
- Publication number
- JP3185378B2 JP3185378B2 JP18338192A JP18338192A JP3185378B2 JP 3185378 B2 JP3185378 B2 JP 3185378B2 JP 18338192 A JP18338192 A JP 18338192A JP 18338192 A JP18338192 A JP 18338192A JP 3185378 B2 JP3185378 B2 JP 3185378B2
- Authority
- JP
- Japan
- Prior art keywords
- sum
- waveform distortion
- frequency
- received signal
- distortion
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はディジタル移動通信装置
などに利用するデータ受信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data receiving device used for a digital mobile communication device or the like.
【０００２】[0002]
【従来の技術】近年、移動通信の需要の急増により、そ
のディジタル化が急速に進められており、これを実現す
るには遅延波による周波数選択性フェージングによる波
形歪みを克服する必要がある。このため、受信機に等化
器を用いて波形歪み補償を行う方法が広く用いられてい
る。ところが移動通信では、電源が電池であるために消
費電力の低減が必須である。そこで波形歪みの補償効果
を保ちつつ消費電力の低減が不可欠となっている。2. Description of the Related Art In recent years, digitalization has been rapidly promoted due to a rapid increase in demand for mobile communication, and it is necessary to overcome waveform distortion due to frequency-selective fading due to delayed waves. For this reason, a method of performing waveform distortion compensation using an equalizer in a receiver is widely used. However, in mobile communication, it is necessary to reduce power consumption because a power source is a battery. Therefore, it is essential to reduce power consumption while maintaining the effect of compensating for waveform distortion.
【０００３】次に、従来のデータ受信装置について説明
する。図３は従来のデータ受信装置の概略構成を示して
いる。図３において、１は受信アンテナである。２は復
調器であり、慣用的な復調を行う。３は参照信号であ
る。４は参照信号３をもとに誤りを検出する誤り検出器
である。５は等化選択器であり、等化器６を用いるか否
かを選択する。７は受信データである。Next, a conventional data receiving apparatus will be described. FIG. 3 shows a schematic configuration of a conventional data receiving apparatus. In FIG. 3, reference numeral 1 denotes a receiving antenna. A demodulator 2 performs a conventional demodulation. 3 is a reference signal. Reference numeral 4 denotes an error detector that detects an error based on the reference signal 3. Reference numeral 5 denotes an equalization selector, which selects whether to use the equalizer 6 or not. 7 is received data.
【０００４】次に、この従来の構成における動作につい
て説明する。まず、受信アンテナ１で受信した受信信号
は、復調器２で復調される。受信側で既知である参照信
号３を送信側で送信信号に挿入して送出する。このた
め、誤り検出器４で復調データの中の参照信号３の部分
についてのみ参照信号３と比較して誤り数を検出する。
この誤り数と等化選択器５で定めたしきい値を比較し、
誤りが多い場合には等化器を用いて出力する。誤りが多
くない場合は復調器２の出力を受信データ７とする。Next, the operation of this conventional configuration will be described. First, a received signal received by the receiving antenna 1 is demodulated by the demodulator 2. The reference signal 3 known on the reception side is inserted into the transmission signal on the transmission side and transmitted. Therefore, the error detector 4 compares only the reference signal 3 in the demodulated data with the reference signal 3 to detect the number of errors.
The number of errors is compared with the threshold value determined by the equalization selector 5, and
If there are many errors, they are output using an equalizer. If there are not many errors, the output of the demodulator 2 is used as the reception data 7.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記の従
来のデータ受信装置では、参照信号３の誤り数でのみ等
化器と通常の復調器の選択を行っている。このため、波
形歪みがなくても熱雑音による誤りが多い場合には等化
器を選択してしまう。さらに、参照信号３のビット数が
少ないため参照信号部分の誤り率の精度が悪く、波形歪
みがあっても等化器を選択しない場合や、波形歪みが少
なくても等化器を選択してしまうことが起こり易い。し
たがって、低消費電力化の効果が得られ難く、さらに性
能が劣化するなどの問題があった。However, in the above-mentioned conventional data receiving apparatus, an equalizer and a normal demodulator are selected only by the number of errors of the reference signal 3. Therefore, if there are many errors due to thermal noise even without waveform distortion, an equalizer is selected. Furthermore, since the number of bits of the reference signal 3 is small, the accuracy of the error rate of the reference signal portion is poor, and the equalizer is not selected even if there is waveform distortion, or the equalizer is selected even if the waveform distortion is small. It is easy to happen. Therefore, there is a problem that it is difficult to obtain the effect of reducing power consumption, and the performance is further deteriorated.
【０００６】本発明は、このような従来の技術における
問題を解決するものであり、性能を劣化させずに平均の
演算量を削減し、消費電力を低減できる優れたデータ受
信装置の提供を目的とする。An object of the present invention is to solve such a problem in the prior art, and to provide an excellent data receiving apparatus capable of reducing an average calculation amount and power consumption without deteriorating performance. And
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明のデータ受信装置は、波形歪みを検出する歪
み検出手段と、検出手段の結果を用いて等化手段を用い
るか否かをバーストごとに選択する等化選択手段と、遅
延波による波形歪みを補償する等化手段と、慣用的な復
調を行う復調手段とを備え、等化手段を使用する必要の
ない波形歪みの少ないバーストに対しては上記復調手段
のみを用いて演算量を削減する構成である。In order to achieve the above object, a data receiving apparatus according to the present invention uses a distortion detecting means for detecting a waveform distortion and an equalizing means using the result of the detecting means. Is provided for each burst, equalizing means for compensating for waveform distortion due to a delayed wave, and demodulating means for performing conventional demodulation, with less waveform distortion that does not require the use of the equalizing means. The configuration is such that the amount of calculation is reduced for the burst by using only the demodulation means.
【０００８】また、歪み検出手段に歪みのない場合の周
波数特性を記憶し、この記憶した周波数特性と受信信号
から推定した周波数特性との自乗誤差和を求め、等化選
択手段において、その大きさと定められたしきい値とを
比較して自乗誤差和の方が大きい場合に等化手段を選択
する構成である。The distortion detecting means stores frequency characteristics when there is no distortion, calculates a sum of square errors of the stored frequency characteristics and the frequency characteristics estimated from the received signal, and outputs the sum of the magnitude and the magnitude to the equalizing selecting means. In this configuration, the equalization means is selected when the sum of the squared errors is greater than a predetermined threshold value.
【０００９】この構成にあって、受信信号から回線の周
波数特性を推定する際に送信側では送信信号の中に受信
側で既知の参照信号を挿入し、受信側では受信信号と挿
入されている参照信号との相互相関を求めて回線のイン
パルス応答ｈ（ｎ）として、ｈ（ｎ）×ｅｘｐ（−ｊω
×１番目の成分とｎ番目の成分の時間差、ω＝角周波
数）の和をとることにより、周波数特性に変換する構成
であり、また、自乗誤差を求める際に受信信号から推定
した周波数特性を推定したインパルス応答の各成分の中
で最大の成分の出力で正規化して用いる構成である。In this configuration, when estimating the frequency characteristics of the line from the received signal, the transmission side inserts a known reference signal into the transmission signal on the reception side, and the reception side inserts the reference signal into the transmission signal. The cross-correlation with the reference signal is obtained, and as the impulse response h (n) of the line, h (n) × exp (−jω
X is the sum of the time difference between the 1st component and the nth component (ω = angular frequency) to convert it to frequency characteristics. In addition, when calculating the square error, the frequency characteristics estimated from the received signal are This is a configuration in which the output of the largest component among the components of the estimated impulse response is normalized and used.
【００１０】[0010]
【作用】このような構成により、本発明のデータ受信装
置は、受信信号の歪みが大きい場合は等化手段を用いて
遅延波の影響による周波数選択性フェージングによる波
形歪みを補償し、受信信号の歪みが小さい場合は慣用的
な復調手段のみで復調するようにしているので、全ての
バーストに対して等化手段を用いる場合に比べて、性能
を劣化させずに平均の演算量が削減し、消費電力が低減
される。With such a configuration, the data receiving apparatus of the present invention compensates for waveform distortion due to frequency-selective fading due to the effect of a delayed wave by using an equalizing means when the distortion of the received signal is large. When the distortion is small, demodulation is performed only by the conventional demodulation means, so that the average calculation amount is reduced without deteriorating the performance as compared with the case of using the equalization means for all bursts, Power consumption is reduced.
【００１１】[0011]
【実施例】以下、本発明のデータ受信装置の実施例を図
面に基づいて詳細に説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a data receiving apparatus according to the present invention.
【００１２】図１は実施例の構成を示している。図１に
おいて、１１は受信アンテナ、１２は慣用的な処理を行
う復調器、１３は参照信号、１４は歪み検出器、１５は
等化選択器、１６は等化器、１７は受信データである。FIG. 1 shows the configuration of the embodiment. In FIG. 1, 11 is a receiving antenna, 12 is a demodulator that performs conventional processing, 13 is a reference signal, 14 is a distortion detector, 15 is an equalization selector, 16 is an equalizer, and 17 is received data. .
【００１３】次に、この実施例の構成における動作につ
いて説明する。まず、受信アンテナ１１で受信した受信
信号は、歪み検出器１４に入力される。送信側では受信
側で既知の参照信号１３を送信信号に挿入して送出する
ので、歪み検出器１４で受信信号と参照信号１３との相
互相関をとることにより、送受信フィルタの特性を含む
回線でのインパルス応答ｈ（ｎ）が推定でき、次式
（１）での和をとることにより、周波数特性に変換す
る。Next, the operation of the embodiment will be described. First, a received signal received by the receiving antenna 11 is input to the distortion detector 14. On the transmitting side, the receiving side inserts the known reference signal 13 into the transmitting signal and sends it out. Therefore, the distortion detector 14 cross-correlates the received signal and the reference signal 13 to obtain a signal including the characteristics of the transmitting / receiving filter on the line. The impulse response h (n) can be estimated, and the sum is calculated by the following equation (1) to convert the sum into frequency characteristics.
【００１４】ｈ（ｎ）×ｅｘｐ（−ｊω×１番目の成分
とｎ番目の成分の時間差）…（１） ω：角周波数 この場合、波形歪みのない場合の周波数特性は図２
（ａ）に示す通りである。H (n) × exp (−jω × time difference between first and nth components) (1) ω: angular frequency In this case, the frequency characteristic without waveform distortion is shown in FIG.
This is as shown in FIG.
【００１５】周波数選択性フェージングがある場合は図
２（ｂ）の様にノッチが発生し、このような場合にのみ
等化器１６が必要となるため、歪み検出器１４では、さ
らに図２（ａ）と受信信号から推定した周波数特性との
距離、すなわち、定められた周波数間隔と受信信号から
推定した周波数特性との自乗誤差を求め、その和の距離
を求める。そして等化選択器１５で、その値が定められ
たしきい値を越えた場合にのみ周波数選択性フェージン
グが存在するとみなして等化器１６を選択する。等化器
１６が選択された場合は演算量は多いが受信データ１７
は周波数選択性フェージングの影響が補償され、選択さ
れない場合は周波数選択性フェージングが存在しないの
で、そのまま慣用的な復調器１２で復調され、演算量を
削減できる。When there is frequency selective fading, a notch occurs as shown in FIG. 2B, and the equalizer 16 is required only in such a case. The distance between a) and the frequency characteristic estimated from the received signal, that is, the square error between the determined frequency interval and the frequency characteristic estimated from the received signal is obtained, and the sum distance is obtained. Then, the equalization selector 15 selects the equalizer 16 on the assumption that the frequency selective fading exists only when the value exceeds a predetermined threshold value. When the equalizer 16 is selected, the amount of calculation is large but the received data 17
Is compensated for by the effect of frequency-selective fading, and when not selected, there is no frequency-selective fading, so that demodulation is performed by the conventional demodulator 12 as it is, and the amount of calculation can be reduced.
【００１６】以上のように本実施例によれば、歪み検出
器１４において回線の歪みを検出し、等化選択器１５で
等化器１６と通常の復調器１２を選択するので、参照信
号の部分で誤り数を検出する場合に比較し、波形歪みの
有無で等化器の選択ができるとともに、その等化器の選
択の精度が高くなる。As described above, according to the present embodiment, the distortion of the line is detected by the distortion detector 14 and the equalizer 16 and the normal demodulator 12 are selected by the equalizer selector 15, so that the reference signal Compared to the case where the number of errors is detected in a portion, an equalizer can be selected depending on the presence or absence of waveform distortion, and the accuracy of selecting the equalizer is increased.
【００１７】[0017]
【発明の効果】以上の説明から明らかなように、本発明
のデータ受信装置は、復調前に受信信号の波形歪みを検
出し、受信信号の歪みが大きい場合は等化手段を用いて
遅延波の影響による周波数選択性フェージングによる波
形歪みを補償し、受信信号の歪みが小さい場合は通常の
復 調手段で復調するようにしているため、全てのバー
ストに対して等化手段を用いる場合に比べて、性能を劣
化させずに平均の演算量を削減し、消費電力を低減でき
るという効果を有する。As is apparent from the above description, the data receiving apparatus of the present invention detects the waveform distortion of the received signal before demodulation.
When the distortion of the received signal is large, the waveform distortion due to the frequency selective fading due to the influence of the delayed wave is compensated for by using the equalizing means, and when the distortion of the received signal is small, the signal is demodulated by ordinary demodulation means. Therefore, as compared with the case where the equalizing means is used for all bursts, there is an effect that the average calculation amount can be reduced and the power consumption can be reduced without deteriorating the performance.
【図１】本発明のデータ受信装置の実施例における構成
を示すブロック図FIG. 1 is a block diagram illustrating a configuration of a data receiving apparatus according to an embodiment of the present invention.
【図２】（ａ）は実施例の動作説明に供され、波形歪み
のない場合の周波数特性図 （ｂ）は実施例の動作説明に供され、周波数選択性フェ
ージングがある場合の周波数特性図FIG. 2A is a diagram illustrating a frequency characteristic when there is no waveform distortion, and FIG. 2B is a diagram illustrating a frequency characteristic when there is frequency selective fading.
【図３】従来のデータ受信装置における構成を示すブロ
ック図FIG. 3 is a block diagram showing a configuration of a conventional data receiving apparatus.
１１ 受信アンテナ １２ 復調器 １３ 参照信号 １４ 歪み検出器 １５ 等化選択器 １６ 等化器 １７ 受信データ Reference Signs List 11 receiving antenna 12 demodulator 13 reference signal 14 distortion detector 15 equalizer selector 16 equalizer 17 received data
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本間 光一 神奈川県横浜市港北区綱島東四丁目３番 １号 松下通信工業株式会社内 (56)参考文献 特開 平３−177136（ＪＰ，Ａ) 特開 平４−177947（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04L 27/00 - 27/38 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Honma 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (56) References JP-A-3-177136 (JP, A) JP-A-4-177947 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H04L 27/00-27/38
Claims (4)
し、この記憶した周波数特性と受信信号から推定した周
波数特性との自乗誤差和を求め、波形歪みを検出する歪
み検出手段と、上記自乗誤差和と定められたしきい値と
を比較して、その比較結果に基づいてバーストごとに等
化手段を用いるか否かを選択する等化選択手段と、遅延
波による波形歪みを補償する等化手段と、慣用的な復調
を行う復調手段を備え、上記比較結果において上記自乗
誤差和の方がしきい値より小さいと判断した波形歪みの
少ないバーストに対しては上記復調手段のみを用いて演
算量を削減することを特徴とするデータ受信装置。1. A frequency characteristic when there is no waveform distortion is stored.
And the frequency estimated from the stored frequency characteristics and the received signal.
Distortion for finding the sum of squared errors with wave number characteristics and detecting waveform distortion
And a threshold value determined as the sum of squared errors.
And then, for each burst, etc., based on the comparison result.
Equalization selection means for selecting whether or not to use the equalization means, and delay
Equalization means for compensating for waveform distortion due to waves and conventional demodulation
Demodulation means for performing
Of the waveform distortion determined that the sum of the errors is smaller than the threshold
For small bursts, only the demodulation means described above can be used.
A data receiving device characterized in that the amount of calculation is reduced .
信号から推定した周波数特性との自乗誤差和を求め、等
化選択手段においてその大きさと定められたしきい値と
を比較して、上記自乗誤差和の方がしきい値より大きい
と判断した波形歪みの多いバーストに対しては等化手段
を選択して波形歪みを補償することを特徴とする請求項
１記載のデータ受信装置。2. Frequency characteristics and reception without waveform distortion
Find the sum of squared errors with the frequency characteristics estimated from the signal, etc.
And the threshold value determined by the size selection means
And the sum of the squared errors is greater than the threshold
Equalizer for bursts with many waveform distortions
2. The data receiving apparatus according to claim 1 , wherein the waveform distortion is compensated by selecting .
る際に送信側では送信信号の中に受信側で既知の参照信
号を挿入し、受信側では受信信号と挿入されている参照
信号との相互相関を求めて回線のインパルス応答ｈ
（ｎ）として、ｈ（ｎ）×ｅｘｐ（―ｊω×１番目の成
分とｎ番目の成分の時間差、ω＝角周波数）の和をとる
ことにより、周波数特性に変換することを特徴とする請
求項１記載のデータ受信装置。3. When estimating a frequency characteristic of a line from a received signal, the transmitting side inserts a known reference signal into the transmission signal on the receiving side, and the receiving side compares the received signal with the inserted reference signal. Find the cross-correlation and impulse response h of the line
As (n), by taking the sum of h (n) × exp (time difference -jω × 1 th component and n-th component, omega = angular frequency), 請 characterized by converting the frequency characteristic
The data receiving device according to claim 1 .
した周波数特性を推定したインパルス応答の各成分の中
で最大の成分の出力で正規化して用いることを特徴とす
る請求項１記載のデータ受信装置。4. The data of claim 1, wherein the use is normalized by the output of the largest components in each component of the impulse response estimating the frequency characteristic estimated from the received signal when obtaining the square error Receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18338192A JP3185378B2 (en) | 1992-07-10 | 1992-07-10 | Data receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18338192A JP3185378B2 (en) | 1992-07-10 | 1992-07-10 | Data receiving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0630057A JPH0630057A (en) | 1994-02-04 |
| JP3185378B2 true JP3185378B2 (en) | 2001-07-09 |
Family
ID=16134778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18338192A Expired - Fee Related JP3185378B2 (en) | 1992-07-10 | 1992-07-10 | Data receiving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3185378B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3289676B2 (en) | 1998-05-28 | 2002-06-10 | 日本電気株式会社 | Method and apparatus for demodulating received signal including pilot signal |
| JP2000299651A (en) | 1999-04-14 | 2000-10-24 | Nec Corp | Equalizer circuit and equalizing processing method to be used for the same |
-
1992
- 1992-07-10 JP JP18338192A patent/JP3185378B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0630057A (en) | 1994-02-04 |
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