JP2829282B2 - Spread spectrum communication equipment - Google Patents

Spread spectrum communication equipment

Info

Publication number
JP2829282B2
JP2829282B2 JP23162296A JP23162296A JP2829282B2 JP 2829282 B2 JP2829282 B2 JP 2829282B2 JP 23162296 A JP23162296 A JP 23162296A JP 23162296 A JP23162296 A JP 23162296A JP 2829282 B2 JP2829282 B2 JP 2829282B2
Authority
JP
Japan
Prior art keywords
signal
spectrum
spreading code
spread spectrum
transmitted
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 - Lifetime
Application number
JP23162296A
Other languages
Japanese (ja)
Other versions
JPH09121179A (en
Inventor
和俊 菅
純一 大泉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP23162296A priority Critical patent/JP2829282B2/en
Publication of JPH09121179A publication Critical patent/JPH09121179A/en
Application granted granted Critical
Publication of JP2829282B2 publication Critical patent/JP2829282B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、送信側で広帯域幅
を持つ拡散符号で伝送情報を拡散変調し、受信側で前記
拡散符号に対応する拡散符号で受信信号を逆拡散して伝
送情報を得るスペクトル拡散通信に関する。 【0002】 【従来の技術】スペクトル拡散通信方式は、伝送すべき
情報をこの情報信号の持つ帯域幅より十分に広い帯域幅
を持つ拡散信号で拡散し送信することにより、高品質の
通信を実現するものである。 【0003】 【発明が解決しようとする課題】帯域幅信号の伝送
、伝送路の特性により影響を受け、高品質の通信を行
うことが困難であった。このとき、スペクトル拡散通信
では、同じ周波数帯域を複数のチャネルで共有して通信
を行うため、一つのチャネルが単純に送出電力を上げる
と、他のチャネルの通信のS/N比が低下する可能性が
あった。 【0004】本発明の目的は、スペクトル拡散通信にお
いて、広帯域幅伝送によるS/N比の劣化を軽減し、よ
り高品質の通信を提供することにある。 【0005】 【課題を解決するための手段】本発明は上記目的を達成
するために、伝送路特性を予め把握または推定し、その
特性を打ち消すように、送信側で、送信信号のスペクト
ル帯域内で搬送波周波数から離れた周辺部分の信号を中
心部分との比較において増強された状態に変形して送信
する。これにより、スペクトルの劣化を軽減して自チャ
ネルにおける通信のS/N比の低下を低減するととも
に、同じ周波数領域を共有する他チャネルの通信への影
響を低減するものである。 【0006】 【発明の実施の形態】本発明に係る以下の実施例では、
伝送路特性をあらかじめ把握、または推定し、その特性
を打ち消すように、送信側の出力スペクトルを受信側で
正常なスペクトルが得られるように増強して送信する。
また、受信側では、送信側で強調した信号を減衰するこ
とにより正常なスペクトルを得る手段を設けて、スペク
トルの劣化を軽減する。以下本発明の実施例を図面を参
照して説明する。 【0007】図1は、本発明の通信装置の送信機側の構
成を示すもので、伝送情報S1は拡散符号発生13からの
拡散符号により、平衡変調器11で拡散されて、伝送信号
S2となる。この伝送信号S2は変(平)衡変調器12において
変調された搬送波発振器14からの搬送波により伝送信号
S3となる。この伝送信号S3は、図3(a)に示すように広
域幅をもつ信号となつている。この伝送信号S3は、スペ
クトル増幅器15によりスペクトル増幅される。このスペ
クトル増強量は、予め把握、または推定される伝送路特
性を打ち消すような値に設定されている。このスペクト
ル増強器15の出力となる伝送信号S7は、例えば、図3
(b)に示すように増強され、アンテナA1より送出され
る。図3(c)は、アンテナ増幅器を含めた伝送路特性を
示し、伝送信号に劣化を与える。 【0008】図2は、本発明の通信装置の受信機側の構
成を示すもので、図1に示した送信機からの送出信号S7
は、アンテナA2により受信される。この受信波は、高周
波増幅器21により増幅されて信号S8となる。この信号S8
は、図3(d)のようになる。この信号S8は、スペクトル
修正器26において信号S9として出力される。この信号S9
は、図3(e)に示すように修正される。これにより、ス
ペクトルの劣化を軽減することができる。その後、信号
S9は、平衡変調器22において、送信側と同一の拡散符号
発生器24からの拡散符号により逆拡散され、信号S1Oと
してベースバンド復調器23に出力する。このベースバン
ド復調器23は、局部発振器25からの局部発振波により、
信号S1Oを復調し、伝達情報S11を出力する。 【0009】なお、上述の実施例においては、受信機側
にスペクトル修正器26を設けたが、図3(c)に示す伝送
路特性の把握が十分に行われている場合には、不要とな
ることは明らかである。 【0010】 【発明の効果】本発明によれば、送信信号のスペクトル
帯域内で搬送波周波数から離れた周辺部分の信号を、中
心部分との比較において増強された状態に変形して送信
し、スペクトルを修正することにより、広帯域幅伝送に
よるS/N比の劣化を軽減することができるとともに、
同じ周波数帯域を使用している他のチャネルの通信への
影響を低減できる。その結果、高品質の通信が可能にな
る。
BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention is, high-bandwidth on the transmission side
The transmission information is spread-modulated with a spreading code having
The received signal is despread with the spreading code corresponding to the spreading code and transmitted.
The present invention relates to spread spectrum communication for obtaining transmission information. 2. Description of the Related Art In a spread spectrum communication system, high quality communication is realized by spreading information to be transmitted with a spread signal having a bandwidth sufficiently larger than the bandwidth of the information signal and transmitting the spread signal. Is what you do. [0003] transmission of a wide bandwidth signal [0005] is affected by the properties of the heat transmission path, it is difficult to perform the high quality communication. At this time, spread spectrum communication
Let's share the same frequency band with multiple channels for communication
One channel simply raises the transmit power to perform
And the possibility that the S / N ratio of communication of other channels may decrease
there were. An object of the present invention is to provide spread spectrum communication .
There are, to reduce the deterioration of the S / N ratio due to high bandwidth transmission, to provide a higher quality communication. [0005] The present invention achieves the above object.
To understand or estimate the channel characteristics in advance,
On the transmitting side, the spectrum of the transmitted signal is canceled so that the characteristics are canceled.
Signal in the peripheral part away from the carrier frequency in the
Deformed and transmitted in an enhanced state compared to the heart
I do. This reduces spectrum degradation and reduces
To reduce the S / N ratio of communication
In addition, the effect on communication of other channels that share the same frequency
It is to reduce the sound. [0006] In the following embodiments according to the present invention,
Understand or estimate transmission path characteristics in advance and
So that the output spectrum of the transmitting side is
The transmission is enhanced so that a normal spectrum can be obtained.
On the receiving side, the signal emphasized on the transmitting side is attenuated.
Means to obtain a normal spectrum by
Reduce the deterioration of torr. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a communication apparatus according to the present invention on a transmitter side. Transmission information S 1 is spread by a balanced modulator 11 by a spreading code from a spreading code generator 13,
It becomes S2. This transmission signal S2 is transmitted by the carrier wave from the carrier wave oscillator 14 modulated in the variable balance (balanced) modulator 12.
S3. This transmission signal S3 is a signal having a wide bandwidth as shown in FIG. The transmission signal S3 is spectrum-amplified by the spectrum amplifier 15. The amount of spectrum enhancement is set in advance to a value that cancels out transmission channel characteristics that are grasped or estimated. The transmission signal S7 output from the spectrum intensifier 15 is, for example, as shown in FIG.
As shown in (b), the signal is amplified and transmitted from the antenna A1. FIG. 3C shows the characteristics of the transmission path including the antenna amplifier, which deteriorates the transmission signal. FIG. 2 shows the configuration of the communication apparatus according to the present invention on the receiver side. The transmission signal S7 from the transmitter shown in FIG.
Is received by the antenna A2. This received wave is amplified by the high frequency amplifier 21 to become a signal S8. This signal S8
Is as shown in FIG. This signal S8 is output from the spectrum corrector 26 as a signal S9. This signal S9
Is modified as shown in FIG. Thereby, the deterioration of the spectrum can be reduced. Then the signal
S9 is despread in the balanced modulator 22 by the spreading code from the same spreading code generator 24 as the transmitting side, and is output to the baseband demodulator 23 as a signal S10. The baseband demodulator 23 uses the local oscillation wave from the local oscillator 25 to
It demodulates signal S1O and outputs transmission information S11. In the above-mentioned embodiment, the spectrum corrector 26 is provided on the receiver side. However, if the transmission path characteristics shown in FIG. Obviously. According to the present invention, the spectrum of a transmission signal is
In the band, the signal of the peripheral part away from the carrier frequency is
Deformed and transmitted in an enhanced state compared to the heart
And modify the spectrum for wideband transmission.
Degradation of the S / N ratio due to
Communication to other channels using the same frequency band.
The effect can be reduced. As a result, high quality communication becomes possible.

【図面の簡単な説明】 【図1】本発明の通信装置の送信機側構成を示す図であ
る。 【図2】本発明の通信装置の受信機側を示す図である。 【図3】本発明の装置における各信号のスペクトル図で
ある。 【符号の説明】 11,12,22…平衡変調器、13,24…拡散符号発生器、21…
高周波増幅器、14…搬送波発振器、25…局部発振器、15
…スペクトル増幅器、26…スペクトル修正器。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of a communication device according to the present invention on a transmitter side. FIG. 2 is a diagram showing a receiver side of the communication device of the present invention. FIG. 3 is a spectrum diagram of each signal in the device of the present invention. [Explanation of Codes] 11, 12, 22 ... Balanced modulator, 13, 24 ... Spread code generator, 21 ...
High frequency amplifier, 14 ... Carrier oscillator, 25 ... Local oscillator, 15
... spectrum amplifier, 26 ... spectrum corrector.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−4350(JP,A) 特開 昭59−6631(JP,A) 特開 昭57−123779(JP,A) 特開 昭53−97747(JP,A) 特開 昭50−126314(JP,A) 特公 昭51−16730(JP,B1)   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-59-4350 (JP, A)                 JP-A-59-6631 (JP, A)                 JP-A-57-123779 (JP, A)                 JP-A-53-97747 (JP, A)                 JP-A-50-126314 (JP, A)                 Tokiko Sho 51-16730 (JP, B1)

Claims (1)

(57)【特許請求の範囲】 1.送信機で伝送情報を広帯域幅を持つ拡散符号で拡散
変調して送信し、受信機で受信した信号を拡散符号で逆
拡散して伝送情報を得るスペクトル拡散通信に用いられ
スペクトル拡散通信用の送信機において、前記送信機
に、送信信号のスペクトル帯域内で搬送波周波数から離
れた周辺部分の信号を、中心部分との比較において、増
強された状態に変形する手段を備えたことを特徴とする
スペクトル拡散通信用の送信機。 2.伝送情報を広帯域幅を持つ拡散符号で拡散変調して
送信する送信機と、受信した信号を拡散符号で逆拡散し
て伝送情報を得る受信機とを備えたスペクトル拡散通信
装置において、送信機側に、送信信号のスペクトル帯域
内で搬送波周波数から離れた周辺部分の信号を、中心部
分との比較において、増強された状態に変形する手段
、受信機側に、受信信号のスペクトル帯域内で搬送波
周波数から離れた周辺部分の信号を、中心部分との比較
において、減衰さた状態に変形して、スペクトルを修
正する手段とを備えたことを特徴とするスペクトル拡散
通信装置。 3.送情報を広帯域幅を持つ拡散符号で拡散変調し
送信し、受信した信号を拡散符号で逆拡散して伝送情報
を得るスペクトル拡散通信方法において、送信側で、送
信信号のスペクトル帯域内で搬送波周波数から離れた
辺部分の信号を、中心部分との比較において、増強され
た状態に変形して送信し、受信側で、受信信号のスペク
トル帯域内で搬送波周波数から離れた周辺部分の信号
を、中心部分との比較において、減衰させた状態に変形
して、スペクトルを修正することを特徴とするスペクト
ル拡散通信方法
(57) [Claims] It is used for spread spectrum communication in which the transmitter transmits and spreads the transmission information with a spreading code having a wide bandwidth, and the receiver receives and despreads the signal received with the spreading code to obtain the transmission information.
That the spread spectrum transmitter for communicating, said transmitter
At a distance from the carrier frequency within the transmitted signal's spectral band.
A transmitter for spread spectrum communication, characterized by comprising means for transforming a signal of a peripheral portion that has been set to an enhanced state in comparison with a central portion. 2. In a spread spectrum communication apparatus including a transmitter that spreads and modulates transmission information with a spreading code having a wide bandwidth and transmits the received signal, and a receiver that despreads a received signal with a spreading code to obtain transmission information, The spectral band of the transmitted signal
The signal of the peripheral portion away from the carrier frequency at an internal, in comparison with the central portion, means for deforming the enhanced state
If, on the receiver side, the signal of the peripheral portion away from the carrier frequency in the spectral band of the received signal, in comparison with the central portion, and deformed in a state of being attenuated, the spectrum Osamu
A spread spectrum communication apparatus comprising: 3. Spread-spectrum modulation to the heat transmission information with a spreading code having a wide band width
Transmitted in a spread spectrum communication method for obtaining the transmitted information received signal by despreading with a spreading code, on the transmission side, transmission
In the spectrum band of the received signal, the signal in the peripheral part distant from the carrier frequency is transformed into an enhanced state in comparison with the center part and transmitted, and the reception side performs the spectrum of the received signal.
Peripheral signal within the Torr band and away from the carrier frequency
Is transformed into a state of attenuation in comparison with the center part
And modify the spectrum
Spread communication method .
JP23162296A 1996-09-02 1996-09-02 Spread spectrum communication equipment Expired - Lifetime JP2829282B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23162296A JP2829282B2 (en) 1996-09-02 1996-09-02 Spread spectrum communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23162296A JP2829282B2 (en) 1996-09-02 1996-09-02 Spread spectrum communication equipment

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP59052109A Division JPS60197040A (en) 1984-03-21 1984-03-21 Spectrum diffusion communicating device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP8252705A Division JPH09121180A (en) 1996-09-25 1996-09-25 Spread spectrum communication equipment

Publications (2)

Publication Number Publication Date
JPH09121179A JPH09121179A (en) 1997-05-06
JP2829282B2 true JP2829282B2 (en) 1998-11-25

Family

ID=16926400

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23162296A Expired - Lifetime JP2829282B2 (en) 1996-09-02 1996-09-02 Spread spectrum communication equipment

Country Status (1)

Country Link
JP (1) JP2829282B2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5116730A (en) * 1974-08-02 1976-02-10 Nippon Kokan Kk KOJUHOHO
JPS594350A (en) * 1982-06-30 1984-01-11 Hitachi Ltd Spread spectrum communication device

Also Published As

Publication number Publication date
JPH09121179A (en) 1997-05-06

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