JPH0993220A - Receiver for spread spectrum communication - Google Patents
Receiver for spread spectrum communicationInfo
- Publication number
- JPH0993220A JPH0993220A JP4963096A JP4963096A JPH0993220A JP H0993220 A JPH0993220 A JP H0993220A JP 4963096 A JP4963096 A JP 4963096A JP 4963096 A JP4963096 A JP 4963096A JP H0993220 A JPH0993220 A JP H0993220A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- despreading
- circuits
- delay
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は直接拡散スペクトラ
ム拡散通信を行う無線局の受信装置に関し、特に複数の
逆拡散回路を備えて、干渉信号を除去する受信装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver of a radio station for direct spread spectrum spread communication, and more particularly to a receiver having a plurality of despreading circuits to remove interference signals.
【０００２】[0002]
【従来の技術】図５は従来の技術の例を示す。同図にお
いて、５−１はアンテナ、５−２は受信機、５−３は逆
拡散回路、５−４は干渉除去回路、５−５は復調回路で
ある。同一の情報伝送速度を有するＮ局の無線局（Ｎは
２以上の整数）からの送信信号がアンテナ５−１に入力
され、アンテナ５−１の出力は受信機５−２に接続さ
れ、受信機５−２の出力はｎ個の逆拡散回路５−３に接
続され、Ｎ局の無線局に対応したそれぞれの拡散符号で
逆拡散が行われ、それらの逆拡散回路５−３の出力は干
渉除去回路５−４に接続され、干渉信号が除去され、干
渉除去回路５−４の出力は復調回路５−５に接続され、
復調され、復調データが出力される。2. Description of the Related Art FIG. 5 shows an example of a conventional technique. In the figure, 5-1 is an antenna, 5-2 is a receiver, 5-3 is a despreading circuit, 5-4 is an interference removal circuit, and 5-5 is a demodulation circuit. A transmission signal from N wireless stations (N is an integer of 2 or more) having the same information transmission rate is input to the antenna 5-1 and the output of the antenna 5-1 is connected to the receiver 5-2 for reception. The output of the machine 5-2 is connected to the n number of despreading circuits 5-3, despreading is performed by each spreading code corresponding to the N station radio stations, and the outputs of the despreading circuits 5-3 are The interference elimination circuit 5-4 is connected to eliminate the interference signal, and the output of the interference elimination circuit 5-4 is connected to the demodulation circuit 5-5.
Demodulated and demodulated data is output.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の技術では、同一の情報伝送速度を有する無線局間の
信号について干渉除去を行うため、複数の情報伝送速度
を有する無線局と通信を行う場合には適用できないとい
う欠点があった。However, in the above-mentioned conventional technique, in order to remove interference between signals between radio stations having the same information transmission rate, communication with radio stations having a plurality of information transmission rates is performed. It had the drawback of not being applicable to.
【０００４】本発明は異なる伝送速度の無線局との通信
に適用可能で干渉信号除去機能を有するスペクトラム拡
散通信用受信装置を提供することを目的とする。An object of the present invention is to provide a spread spectrum communication receiver applicable to communication with wireless stations having different transmission rates and having an interference signal canceling function.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
の第１の本発明の特徴は、複数の情報伝送速度を有する
複数の情報信号が各々対応する拡散符号によりスペクト
ラム拡散されて送信され、該複数の送信信号を同時に受
信するスペクトラム拡散通信用受信装置において、前記
各拡散符号に対応する複数の逆拡散回路と、最も拡散率
が大きい拡散符号に対応する前記逆拡散回路以外の前記
各逆拡散回路の出力に接続される複数の遅延回路と、前
記各逆拡散回路と前記各遅延回路の各々の出力に接続さ
れる干渉除去回路とを有するスペクトラム拡散通信用受
信装置にある。A first feature of the present invention for achieving the above object is that a plurality of information signals having a plurality of information transmission rates are spectrum-spread by corresponding spreading codes and transmitted. In a receiver for spread spectrum communication that simultaneously receives the plurality of transmission signals, a plurality of despreading circuits corresponding to the spreading codes and the despreading circuits other than the despreading circuit corresponding to a spreading code having the largest spreading factor. A receiver for spread spectrum communication having a plurality of delay circuits connected to the output of a spreader circuit and an interference canceling circuit connected to the outputs of the despreading circuits and the delay circuits.
【０００６】当該第１の発明によれば、最も低速な情報
伝送速度の１シンボル分の時間に対応する逆拡散回路の
出力信号が干渉除去回路に入力されるので、最も低速な
情報伝送速度を有する無線局からの受信信号に対する干
渉信号を除去することができる。According to the first aspect of the invention, since the output signal of the despreading circuit corresponding to the time corresponding to one symbol of the slowest information transmission rate is input to the interference canceling circuit, the slowest information transmission rate can be obtained. An interference signal with respect to a received signal from a wireless station having the same can be removed.
【０００７】第２の本発明の特徴は、複数の情報伝送速
度を有する複数の情報信号が各々対応する拡散符号によ
りスペクトラム拡散されて送信され、該複数の送信信号
を同時に受信するスペクトラム拡散通信用受信装置にお
いて、前記各拡散符号に対応する複数の逆拡散回路と、
最も拡散率が大きい拡散符号に対応する逆拡散回路以外
の前記各逆拡散回路の出力に接続される複数の第１の遅
延回路と、前記各逆拡散回路と前記第１の遅延回路の各
々の出力に接続される複数の第２の遅延回路と、前記各
逆拡散回路、前記各第１の遅延回路及び前記各第２の遅
延回路の各々の出力に接続される干渉除去回路とを有す
るスペクトラム拡散通信用受信装置にある。A second feature of the present invention is for spread spectrum communication in which a plurality of information signals having a plurality of information transmission rates are spread spectrum by respective corresponding spread codes and transmitted, and the plurality of transmission signals are simultaneously received. In the receiving device, a plurality of despreading circuits corresponding to the respective spreading codes,
A plurality of first delay circuits connected to the outputs of the despreading circuits other than the despreading circuit corresponding to the spreading code having the largest spreading factor; and the despreading circuits and the first delay circuits, respectively. Spectrum having a plurality of second delay circuits connected to the output, and an interference canceling circuit connected to the outputs of the despreading circuits, the first delay circuits, and the second delay circuits It is in a receiver for spread communication.
【０００８】当該第２の発明によれば、全ての逆拡散回
路に接続された遅延回路が干渉除去回路に接続されるの
で、最も低速な情報伝送速度を有する無線局からの受信
信号に対して、無線区間において発生した干渉信号の遅
延波を除去することができる。According to the second aspect of the invention, since the delay circuits connected to all the despreading circuits are connected to the interference canceling circuit, the received signal from the radio station having the slowest information transmission rate is received. The delayed wave of the interference signal generated in the wireless section can be removed.
【０００９】第３の本発明の特徴は、複数の情報伝送速
度を有する複数の情報信号が各々対応する拡散符号によ
りスペクトラム拡散されて送信され、該複数の送信信号
を同時に受信するスペクトラム拡散通信用受信装置にお
いて、前記各拡散符号に対応する複数の逆拡散回路と、
該各逆拡散回路の出力に接続される複数の第３の遅延回
路と、最も拡散率が大きい拡散符号に対応する前記逆拡
散回路以外の各逆拡散回路の出力及びそれらの前記各第
３の遅延回路の出力に各々接続される複数の第４の遅延
回路と、前記各逆拡散回路、前記各第３の遅延回路及び
前記各第４の遅延回路の各々の出力に接続される干渉除
去回路とを有するスペクトラム拡散通信用受信装置にあ
る。A third feature of the present invention is that for spread spectrum communication in which a plurality of information signals having a plurality of information transmission rates are spectrum-spread by corresponding spreading codes and transmitted, and the plurality of transmission signals are simultaneously received. In the receiving device, a plurality of despreading circuits corresponding to the respective spreading codes,
A plurality of third delay circuits connected to the output of each despreading circuit, outputs of each despreading circuit other than the despreading circuit corresponding to the spreading code having the largest spreading factor, and the respective third of them. A plurality of fourth delay circuits each connected to the output of the delay circuit, and an interference cancellation circuit connected to each output of the despreading circuits, the third delay circuits, and the fourth delay circuits. And a receiver for spread spectrum communication having.
【００１０】当該第３の発明によれば、前記第２の発明
と同様に、全ての逆拡散回路に接続された遅延回路が干
渉除去回路に接続されるので、最も低速な情報伝送速度
を有する無線局からの受信信号に対して、無線区間にお
いて発生した干渉信号の遅延波を除去することができ
る。According to the third aspect of the invention, as in the second aspect of the invention, since the delay circuits connected to all the despreading circuits are connected to the interference canceling circuit, it has the lowest information transmission rate. The delayed wave of the interference signal generated in the wireless section can be removed from the received signal from the wireless station.
【００１１】[0011]
【発明の実施の形態】図１は本発明の第１の実施の形態
例を示す。情報伝送速度がａ１（ａ１は実数）であるＮ
a1局（Ｎa1は１以上の整数）の無線局および、情報伝送
速度がａ２（ａ２はａ２＞ａ１となる実数）であるＮa2
局（Ｎa2は１以上の整数）の無線局と同時に直接拡散ス
ペクトラム拡散無線通信を行う無線局の受信装置におい
て、ａ２＝２×ａ１の場合を示す。同図において、１−
１はアンテナ、１−２は受信機、１−３は逆拡散回路、
１−４は遅延回路、１−５は干渉除去回路、１−６は復
調回路である。FIG. 1 shows a first embodiment of the present invention. N whose information transmission rate is a1 (a1 is a real number)
Radio station of a1 station (N a1 is an integer of 1 or more) and N a2 whose information transmission rate is a2 (a2 is a real number satisfying a2> a1)
The case where a2 = 2 × a1 is shown in the receiving device of the wireless station that performs direct spread spectrum wireless communication simultaneously with the wireless stations of stations (N a2 is an integer of 1 or more). In the figure, 1-
1 is an antenna, 1-2 is a receiver, 1-3 is a despreading circuit,
1-4 is a delay circuit, 1-5 is an interference removal circuit, and 1-6 is a demodulation circuit.
【００１２】次に、本実施の形態例の動作を説明する
と、まず無線局からの送信信号がアンテナ１−１に入力
され、アンテナ１−１の出力は受信機１−２に接続さ
れ、受信機１−２の出力は（Ｎa1＋Ｎa2）個の逆拡散回
路１−３に接続され、（Ｎa1＋Ｎa2）局の無線局に対応
したそれぞれの拡散符号で逆拡散が行われ、Ｎa2個の逆
拡散回路１−３の出力は遅延回路１−４に接続される。
そして、情報伝送速度ａ２の１情報シンボル分だけ遅延
され、Ｎa2個の遅延回路１−４と（Ｎa1＋Ｎa2）個の逆
拡散回路１−３の出力は干渉除去回路１−５に接続さ
れ、干渉信号が除去される。次いで、干渉除去回路１−
５の出力は復調回路１−６に接続され、復調され、復調
データが出力される。Next, the operation of the present embodiment will be described. First, a transmission signal from a wireless station is input to the antenna 1-1, and the output of the antenna 1-1 is connected to the receiver 1-2 and received. The output of the machine 1-2 is connected to the (N a1 + N a2 ) number of despreading circuits 1-3, and despreading is performed with each spreading code corresponding to the radio station of the (N a1 + N a2 ) station, and N The outputs of the a2 despreading circuits 1-3 are connected to the delay circuit 1-4.
Then, it is only 1 information symbol delay information transmission rate a2, connected to the N a2 amino delay circuits 1-4 (N a1 + N a2) pieces output of the despreading circuit 1-3 interference removing circuit 1-5 And the interference signal is removed. Next, the interference canceling circuit 1-
The output of 5 is connected to the demodulation circuit 1-6, demodulated, and demodulated data is output.
【００１３】図２は本発明の第２の実施の形態例を示
す。情報伝送速度がａ１（ａ１は実数）であるＮa1局
（Ｎa1は１以上の整数）の無線局および、情報伝送速度
がａ２（ａ２はａ２＞ａ１となる実数）であるＮa2局
（Ｎa2は１以上の整数）の無線局と同時に直接拡散スペ
クトラム拡散無線通信を行う無線局の受信装置におい
て、ａ２＝２×ａ１の場合を示す。同図において、２−
１はアンテナ、２−２は受信機、２−３は情報伝送速度
がａ１の無線局に対する逆拡散回路、２−４は情報伝送
速度がａ２の無線局に対する逆拡散回路、２−５は無線
区間において発生した遅延波に対応した遅延回路ＴC 、
２−６は情報伝送速度ａ２の１情報シンボル分に対応し
た遅延回路ＴS 、２−７は干渉除去回路、２−６は復調
回路である。FIG. 2 shows a second embodiment of the present invention. Information transmission rate a1 (a1 is a real number) is a N a1 stations (N a1 is an integer of 1 or more) radio stations and the information transmission rate is a2 (a2 is a2> a1 to become real number) is a N a2 stations ( N a2 is an integer equal to or greater than 1) and indicates a case of a2 = 2 × a1 in the receiving device of the wireless station that performs direct spread spectrum wireless communication simultaneously with the wireless station. In the figure, 2-
1 is an antenna, 2-2 is a receiver, 2-3 is a despreading circuit for a wireless station whose information transmission rate is a1, 2-4 is a despreading circuit for a wireless station whose information transmission rate is a2, and 2-5 is a wireless A delay circuit T C corresponding to the delayed wave generated in the section,
2-6 is a delay circuit T S corresponding to one information symbol of the information transmission rate a2, 2-7 is an interference canceling circuit, and 2-6 is a demodulating circuit.
【００１４】次に、本実施の形態例の動作を説明する
と、まず無線局からの送信信号がアンテナ２−１に入力
され、アンテナ２−１の出力は受信機２−２に接続され
る。そして、受信機２−２の出力は（Ｎa1＋Ｎa2）個の
逆拡散回路２−３に接続され、（Ｎa1＋Ｎa2）局の無線
局に対応したそれぞれの拡散符号で逆拡散が行われ、Ｎ
a1個の逆拡散回路２−３の出力は遅延回路ＴC ２−５に
接続される。また無線区間において発生した先行波と遅
延波の時間差分だけ遅延され、Ｎa2個の逆拡散回路２−
４の出力は遅延回路ＴS ２−６に接続される。そして、
情報伝送速度ａ２の１情報シンボル分だけ遅延され、そ
のＮa2個の遅延回路ＴS ２−６とＮa2個の逆拡散回路Ｔ
S ２−４の出力はそれぞれ遅延回路ＴC に接続される。
さらに、無線区間において発生した先行波と遅延波の時
間差分だけ遅延され、（Ｎa1＋Ｎa2）個の逆拡散回路の
出力とすべての遅延回路の出力は干渉除去回路２−７に
接続され、干渉信号が除去される。次いで、その干渉除
去回路２−７の出力は復調回路２−８に接続され、復調
され、復調データが出力される。なお、先行波と遅延波
の時間差は逆拡散回路の出力信号より推定される。Next, the operation of this embodiment will be described. First, the transmission signal from the wireless station is input to the antenna 2-1 and the output of the antenna 2-1 is connected to the receiver 2-2. The output of the receiver 2-2 is connected to the (N a1 + N a2 ) number of despreading circuits 2-3, and despreading is performed with each spreading code corresponding to the radio station of the (N a1 + N a2 ) station. I'm N
The output of the a1 despreading circuit 2-3 is connected to the delay circuit T C 2-5. Further, it is delayed by the time difference between the preceding wave and the delayed wave generated in the wireless section, and the N a2 despreading circuits 2-
The output of 4 is connected to the delay circuit T S 2-6. And
The information transmission rate a2 is delayed by one information symbol, and the N a2 delay circuits T S 2-6 and N a2 despreading circuits T thereof are delayed.
The outputs of S 2-4 are connected to the delay circuit T C , respectively.
Furthermore, the output of the (N a1 + N a2 ) despreading circuits and the outputs of all the delay circuits are delayed by the time difference between the preceding wave and the delayed wave generated in the wireless section, and are connected to the interference canceling circuit 2-7. Interfering signals are removed. Next, the output of the interference removing circuit 2-7 is connected to the demodulation circuit 2-8, demodulated, and demodulated data is output. The time difference between the preceding wave and the delayed wave is estimated from the output signal of the despreading circuit.
【００１５】なお、本実施の形態例における、Ｎa2個の
逆拡散回路２−４に接続されている遅延回路ＴC ２−５
と遅延回路ＴS ２−６との接続配置を逆にしても同様な
効果を得られることは言うまでもない。即ち、逆拡散回
路２−４の出力には遅延回路ＴC ２−５が接続され、そ
の遅延回路ＴC ２−５と逆拡散回路ＴS ２−４の出力に
はそれぞれ遅延回路ＴS ２−６が接続される。In the present embodiment, the delay circuit T C 2-5 connected to the N a2 despreading circuits 2-4 is used.
It goes without saying that the same effect can be obtained by reversing the connection arrangement of the delay circuit T S 2-6 and the delay circuit T S 2-6. That is, the output of the despreading circuit 2-4 is connected a delay circuit T C 2-5, the delay circuit T C 2-5 despreading circuits T each of the output delay circuit S 2-4 T S 2 -6 is connected.
【００１６】図３は本発明の送信信号列の例を示す。同
図において、３−１は情報伝送速度ａ１の無線局の送信
信号列、３−２は情報伝送速度ａ２の無線局の送信信号
列を示す。情報伝送速度ａ１の無線局から１情報シンボ
ル伝送するのに要する時間は、情報伝送速度ａ２の無線
局から２情報シンボル伝送するのに要する時間に相当す
るため、情報伝送速度ａ１の無線局からの受信信号を１
情報シンボル復調する場合には、情報伝送速度ａ２の無
線局からの受信信号のうち２情報シンボル分の信号が干
渉信号となる。本発明では、情報伝送速度ａ１の無線局
の拡散符号に応じた逆拡散回路の出力信号の１情報シン
ボル分と、情報伝送速度ａ２の無線局の拡散符号に応じ
た逆拡散回路の出力信号の２情報シンボル分が干渉除去
回路に入力され、干渉信号が除去される。FIG. 3 shows an example of the transmission signal sequence of the present invention. In the figure, 3-1 shows a transmission signal sequence of a wireless station with an information transmission rate a1, and 3-2 shows a transmission signal sequence of a wireless station with an information transmission rate a2. The time required to transmit one information symbol from the wireless station having the information transmission rate a1 corresponds to the time required to transmit two information symbols from the wireless station having the information transmission rate a2. Received signal 1
In the case of information symbol demodulation, a signal corresponding to two information symbols in the received signal from the wireless station having the information transmission rate a2 becomes an interference signal. According to the present invention, one information symbol of the output signal of the despreading circuit corresponding to the spreading code of the wireless station having the information transmission rate a1 and the output signal of the despreading circuit corresponding to the spreading code of the wireless station having the information transmission rate a2. The two information symbols are input to the interference canceling circuit to cancel the interference signal.
【００１７】図４は本発明における干渉除去回路の具体
的構成例を示す。同図において、４−１はタップ係数発
生器、４−２は乗算器、４−３は加算器を示す。（Ｎa1
＋Ｎa2）個の逆拡散回路１−３の出力と、Ｎa2個の遅延
回路の出力が入力される。乗算器３−２においてタップ
係数を発生するタップ係数発生器３−１の出力と、前記
１−３および１−４の出力が乗算され、乗算器３−２の
出力は加算器３−３に入力され、加算器３−３では（Ｎ
a1＋Ｎa2）個の入力信号を加算した信号を出力し、復調
回路４−６に入力される。タップ係数を決定する方法と
しては、例えば、トレーニング信号を送信し、トレーニ
ング信号と加算器３−３の出力信号との誤差が最小にな
るように決定する方法（工藤“ＤＳ／ＣＤＭＡ無線通信
における干渉除去の一検討”、電子情報通信学会春季全
国大会、Ｂ−３９２（１９９４））、拡散符号間の相互
相関値より決定する方法がある（Ｒ．Ｌｕｐｕｓ ＆
Ｓ．Ｖｅｒｄｕ， “Ｌｉｎｅａｒ Ｍｕｌｔｉｕｓｅ
ｒ Ｄｅｔｅｃｔｏｒｓｆｏｒ Ｓｙｓｃｈｒｏｎｏｕ
ｓ Ｃｏｄｅ−Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ−
Ａｃｃｅｓｓ Ｃｈａｎｎｅｌｓ”， ＩＥＥＥ Ｔｒ
ａｎｓａｃｔｉｏｎｓ ｏｎ Ｉｎｆｏｒｍａｔｉｏｎ
Ｔｈｅｏｒｙ， ｖｏｌ．３５， ｎｏ．１ ｐｐ．
１２３−１３６（１９８９））。また、第２の実施の形
態例に対しては本干渉除去回路を適用した場合には、希
望信号の先行波と遅延波を合波することができるので、
パスダイバーシティ効果も得られる。FIG. 4 shows a concrete configuration example of the interference canceling circuit according to the present invention. In the figure, 4-1 is a tap coefficient generator, 4-2 is a multiplier, and 4-3 is an adder. (N a1
The outputs of the + N a2 ) despreading circuits 1-3 and the outputs of the N a2 delay circuits are input. The output of the tap coefficient generator 3-1 that generates the tap coefficient in the multiplier 3-2 is multiplied by the outputs of the above 1-3 and 1-4, and the output of the multiplier 3-2 is sent to the adder 3-3. It is input, and (N
A signal obtained by adding a1 + N a2 ) input signals is output and input to the demodulation circuit 4-6. As a method of determining the tap coefficient, for example, a method of transmitting a training signal and deciding so as to minimize the error between the training signal and the output signal of the adder 3-3 (interference in Kudo “DS / CDMA wireless communication "A Study on Removal", IEICE Spring National Convention, B-392 (1994)), and there is a method of determining from the cross-correlation value between spreading codes (R. Lupus &
S. Verdu, “Linear Multiuse
r Detectors for Systronou
s Code-Division Multiple-
Access Channels ", IEEE Tr
actions on Information
Theory, vol. 35, no. 1 pp.
123-136 (1989)). Further, when the interference removing circuit is applied to the second embodiment, the preceding wave and the delayed wave of the desired signal can be combined,
A path diversity effect can also be obtained.
【００１８】なお、本実施例ではａ２＝２×ａ１の場合
について示したが、ａ２＞２×ａ１の場合についても遅
延回路を増設し、多数の情報シンボル分の信号を干渉除
去回路に入力することによって同様の効果が得られる。
また、各実施例では２種の情報伝送速度を有する無線局
の受信装置について示したが、３種以上の場合も同様で
ある。In this embodiment, the case of a2 = 2 × a1 is shown, but also in the case of a2> 2 × a1, a delay circuit is added and a large number of information symbol signals are input to the interference canceling circuit. Therefore, the same effect can be obtained.
Further, in each embodiment, the receiver of the wireless station having two kinds of information transmission rates is shown, but the same applies to the case of three or more kinds.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
最も低速な情報伝送速度の１シンボル分の時間に対応す
る逆拡散回路の出力信号が干渉除去回路に入力されるの
で、最も低速な情報伝送速度を有する無線局からの受信
信号に対する干渉信号を除去することができる。また、
全ての逆拡散回路に接続された遅延回路の出力信号が干
渉除去回路に接続されるので、無線区間において発生し
た干渉信号の遅延波を除去波も除去することができる。As described above, according to the present invention,
Since the output signal of the despreading circuit corresponding to the time corresponding to one symbol of the lowest information transmission rate is input to the interference elimination circuit, the interference signal with respect to the reception signal from the radio station having the lowest information transmission rate is eliminated. can do. Also,
Since the output signals of the delay circuits connected to all the despreading circuits are connected to the interference removal circuit, the delayed wave of the interference signal generated in the wireless section can also be removed.
【図１】本発明の第１の実施の形態例を示す図である。FIG. 1 is a diagram showing a first exemplary embodiment of the present invention.
【図２】本発明の第２の実施の形態例を示す図である。FIG. 2 is a diagram showing a second exemplary embodiment of the present invention.
【図３】本発明の送信信号列の例である。FIG. 3 is an example of a transmission signal sequence of the present invention.
【図４】本発明の干渉除去回路の具体的構成例を示す図
である。FIG. 4 is a diagram showing a specific configuration example of an interference canceling circuit of the present invention.
【図５】従来の技術の例を示す図である。FIG. 5 is a diagram showing an example of a conventional technique.
１−１ アンテナ １−２ 受信機 １−３ 逆拡散回路 １−４ 遅延回路 １−５ 干渉除去回路 １−６ 復調回路 ２−１ アンテナ ２−２ 受信機 ２−３ 逆拡散回路 ２−４ 逆拡散回路 ２−５ 遅延回路ＴC ２−６ 遅延回路ＴS ２−７ 干渉除去回路 ２−８ 復調回路 ３−１ 情報伝送速度ａ１の無線局の送信信号列 ３−２ 情報伝送速度ａ２の無線局の送信信号列 ４−１ タップ係数発生器 ４−２ 乗算器 ４−３ 加算器 ５−１ アンテナ ５−２ 受信機 ５−３ 逆拡散回路 ５−４ 干渉除去回路 ５−５ 復調回路1-1 Antenna 1-2 Receiver 1-3 Despreading circuit 1-4 Delay circuit 1-5 Interference removal circuit 1-6 Demodulation circuit 2-1 Antenna 2-2 Receiver 2-3 Despreading circuit 2-4 Inverse Spreading circuit 2-5 Delay circuit T C 2-6 Delay circuit T S 2-7 Interference removal circuit 2-8 Demodulation circuit 3-1 Transmission signal sequence of wireless station with information transmission rate a1 3-2 Wireless with information transmission rate a2 Station transmission signal sequence 4-1 Tap coefficient generator 4-2 Multiplier 4-3 Adder 5-1 Antenna 5-2 Receiver 5-3 Despreading circuit 5-4 Interference removal circuit 5-5 Demodulation circuit
Claims (3)
信号が各々対応する拡散符号によりスペクトラム拡散さ
れて送信され、該複数の送信信号を同時に受信するスペ
クトラム拡散通信用受信装置において、 前記各拡散符号に対応する複数の逆拡散回路と、 最も拡散率が大きい拡散符号に対応する前記逆拡散回路
以外の前記各逆拡散回路の出力に接続される複数の遅延
回路と、 前記各逆拡散回路と前記各遅延回路の出力に接続される
干渉除去回路とを有することを特徴とする、スペクトラ
ム拡散通信用受信装置。1. A spread spectrum communication receiving apparatus, wherein a plurality of information signals having a plurality of information transmission rates are spread-spectrum by respective corresponding spread codes and transmitted, and the plurality of transmission signals are received at the same time. A plurality of despreading circuits corresponding to the code, a plurality of delay circuits connected to the output of each despreading circuit other than the despreading circuit corresponding to the spreading code with the largest spreading factor, and each despreading circuit, A receiver for spread spectrum communication, comprising: an interference canceling circuit connected to an output of each delay circuit.
信号が各々対応する拡散符号によりスペクトラム拡散さ
れて送信され、該複数の送信信号を同時に受信するスペ
クトラム拡散通信用受信装置において、 前記各拡散符号に対応する複数の逆拡散回路と、 最も拡散率が大きい拡散符号に対応する前記逆拡散回路
以外の前記各逆拡散回路の出力に接続される複数の第１
の遅延回路と、 前記各逆拡散回路と前記第１の遅延回路の各々の出力に
接続される複数の第２の遅延回路と、 前記各逆拡散回路、前記各第１の遅延回路及び前記各第
２の遅延回路の各出力に接続される干渉除去回路とを有
することを特徴とする、スペクトラム拡散通信用受信装
置。2. A spread spectrum communication receiving apparatus, wherein a plurality of information signals having a plurality of information transmission rates are spread spectrum by respective corresponding spread codes and transmitted, and the plurality of transmission signals are received at the same time. A plurality of despreading circuits corresponding to the code and a plurality of first despreading circuits connected to the output of each despreading circuit other than the despreading circuit corresponding to the spreading code with the largest spreading factor.
Delay circuits, a plurality of second delay circuits connected to the outputs of the despreading circuits and the first delay circuits, the despreading circuits, the first delay circuits, and the second delay circuits. A receiver for spread spectrum communication, comprising: an interference canceling circuit connected to each output of the second delay circuit.
信号が各々対応する拡散符号によりスペクトラム拡散さ
れて送信され、該複数の送信信号を同時に受信するスペ
クトラム拡散通信用受信装置において、 前記各拡散符号に対応する複数の逆拡散回路と、 該各逆拡散回路の出力に接続される複数の第３の遅延回
路と、 最も拡散率が大きい拡散符号に対応する前記逆拡散回路
以外の前記各逆拡散回路の出力及びそれらの前記各第３
の遅延回路の出力に各々接続される複数の第４の遅延回
路と、 前記各逆拡散回路、前記各第３の遅延回路及び前記各第
４の遅延回路の各出力に接続される干渉除去回路とを有
することを特徴とする、スペクトラム拡散通信用受信装
置。3. A spread spectrum communication receiving apparatus, wherein a plurality of information signals having a plurality of information transmission rates are spread spectrum by respective corresponding spread codes and transmitted, and the plurality of transmission signals are received at the same time. A plurality of despreading circuits corresponding to the code, a plurality of third delay circuits connected to the outputs of the despreading circuits, and the despreading circuits other than the despreading circuit corresponding to the spreading code having the largest spreading factor. The output of the spreading circuit and the third of each of them
A plurality of fourth delay circuits each connected to the output of each delay circuit, and an interference canceling circuit connected to each output of each despreading circuit, each third delay circuit, and each fourth delay circuit. A receiver for spread spectrum communication, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4963096A JP3208650B2 (en) | 1995-07-13 | 1996-02-14 | Receiver for spread spectrum communication |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-199246 | 1995-07-13 | ||
| JP19924695 | 1995-07-13 | ||
| JP4963096A JP3208650B2 (en) | 1995-07-13 | 1996-02-14 | Receiver for spread spectrum communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0993220A true JPH0993220A (en) | 1997-04-04 |
| JP3208650B2 JP3208650B2 (en) | 2001-09-17 |
Family
ID=26390045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4963096A Expired - Fee Related JP3208650B2 (en) | 1995-07-13 | 1996-02-14 | Receiver for spread spectrum communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3208650B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998047246A1 (en) * | 1997-04-17 | 1998-10-22 | Ntt Mobile Communications Network Inc. | Base station apparatus of mobile communication system |
-
1996
- 1996-02-14 JP JP4963096A patent/JP3208650B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998047246A1 (en) * | 1997-04-17 | 1998-10-22 | Ntt Mobile Communications Network Inc. | Base station apparatus of mobile communication system |
| US6782035B1 (en) | 1997-04-17 | 2004-08-24 | Ntt Docomo Inc. | Base station apparatus of mobile communication system |
| US7095780B2 (en) | 1997-04-17 | 2006-08-22 | Ntt Docomo, Inc. | Base station apparatus of mobile communication system |
| US7443907B2 (en) | 1997-04-17 | 2008-10-28 | Ntt Docomo, Inc. | Base station apparatus of mobile communication system |
| US7672357B2 (en) | 1997-04-17 | 2010-03-02 | Ntt Docomo, Inc. | Base station apparatus of mobile communication system |
| US7826861B2 (en) | 1997-04-17 | 2010-11-02 | Ntt Docomo, Inc. | Base station apparatus of mobile communication system |
| US8005120B2 (en) | 1997-04-17 | 2011-08-23 | Ntt Docomo, Inc. | Base station apparatus of mobile communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3208650B2 (en) | 2001-09-17 |
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