JP3208650B2 - Receiver for spread spectrum communication - Google Patents
Receiver for spread spectrum communicationInfo
- Publication number
- JP3208650B2 JP3208650B2 JP4963096A JP4963096A JP3208650B2 JP 3208650 B2 JP3208650 B2 JP 3208650B2 JP 4963096 A JP4963096 A JP 4963096A JP 4963096 A JP4963096 A JP 4963096A JP 3208650 B2 JP3208650 B2 JP 3208650B2
- Authority
- JP
- Japan
- Prior art keywords
- circuits
- despreading
- circuit
- delay
- outputs
- 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.)
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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 receiving apparatus for a radio station performing direct spread spectrum communication, and more particularly to a receiving apparatus having a plurality of despreading circuits for removing an interference signal.
【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 the prior art. 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. Transmission signals from N radio stations (N is an integer of 2 or more) having the same information transmission rate are input to the antenna 5-1. The output of the antenna 5-1 is connected to the receiver 5-2, and reception is performed. The output of the device 5-2 is connected to n despreading circuits 5-3, and despreading is performed with the respective spreading codes corresponding to the N radio stations. The outputs of the despreading circuits 5-3 are 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, according to the above-mentioned conventional technique, in order to remove interference between signals between wireless stations having the same information transmission rate, it is necessary to perform communication with wireless stations having a plurality of information transmission rates. Has the drawback that it cannot be applied.
【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 receiver for spread spectrum communication which can be applied to communication with radio stations having different transmission rates and has an interference signal removing 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 speeds are spread by respective corresponding spread codes and transmitted. In the receiver for spread spectrum communication that receives the plurality of transmission signals simultaneously, a plurality of despreading circuits corresponding to the respective spreading codes and the respective despreading circuits other than the despreading circuit corresponding to the spreading code having the largest spreading factor. A receiving apparatus for spread spectrum communication has a plurality of delay circuits connected to an output of a spreading circuit, and an interference canceling circuit connected to each of the despreading circuits and the output of each of 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, 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 cancellation circuit. It is possible to remove an interference signal with respect to a received signal from a wireless station having the same.
【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 that a plurality of information signals having a plurality of information transmission speeds are spread by a corresponding spreading code 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 respective despreading circuits other than the despreading circuit corresponding to the spreading code having the largest spreading factor; and each of the despreading circuits and the first delay circuit. A spectrum comprising: a plurality of second delay circuits connected to an output; and an interference canceling circuit connected to each output of the despreading circuit, the first delay circuit, and the second delay circuit. It is in the 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, the delay circuits connected to all the despreading circuits are connected to the interference canceling circuit. In addition, a delayed wave of an interference signal generated in a 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 a plurality of information signals having a plurality of information transmission speeds are spread by a corresponding spreading code 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 outputs of the respective despreading circuits; outputs of the respective despreading circuits other than the despreading circuits corresponding to the spreading code having the largest spreading factor; A plurality of fourth delay circuits respectively connected to the outputs of the delay circuits; and an interference canceling circuit connected to the respective outputs of the respective despreading circuits, the respective third delay circuits, and the respective fourth delay circuits. And a receiving device for spread spectrum communication.
【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, similarly to the second aspect, since the delay circuits connected to all the despreading circuits are connected to the interference canceling circuit, they have the lowest information transmission speed. A delayed wave of an interference signal generated in a wireless section can be removed from a signal received from a 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 speed is a1 (a1 is a real number)
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)
A case where a2 = 2 × a1 is shown in a receiving apparatus of a wireless station that performs direct spread spectrum spread wireless communication simultaneously with a wireless station of a station ( Na2 is an integer of 1 or more). In FIG.
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 this embodiment will be described. First, a transmission signal from a radio station is input to an antenna 1-1, an output of the antenna 1-1 is connected to a receiver 1-2, and reception is performed. the output of machine 2 is connected to the (N a1 + N a2) despread circuits 1-3, despreading is performed for each spreading code corresponding to the radio station (N a1 + N a2) station, N Outputs of the a2 despreading circuits 1-3 are connected to a delay circuit 1-4.
Then, the output is delayed by one information symbol of the information transmission rate a2, and the outputs of the Na 2 delay circuits 1-4 and the (N a1 + N a2 ) despreading circuits 1-3 are connected to the interference removal circuit 1-5. And the interference signal is removed. Next, the interference removal circuit 1-
The output of No. 5 is connected to a 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 of 1 or more) The case where a2 = 2 × a1 in a receiving apparatus of a wireless station that directly performs spread spectrum wireless communication simultaneously with a wireless station. In FIG.
1 is an antenna, 2-2 is a receiver, 2-3 is a despreading circuit for a radio station having an information transmission rate of a1, 2-4 is a despreading circuit for a radio station having an information transmission rate of a2, and 2-5 is a radio station. A delay circuit T C corresponding to the delay wave generated in the section,
2-6 Information delay circuit T S corresponding to one information symbol transmission rate a2, is 2-7 interference cancellation circuit, is 2-6 is the demodulation 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, a transmission signal from a radio 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) despread circuits 2-3, (N a1 + N a2 ) despreading line in each of the spreading code corresponding to the radio station of the station We, N
The output of a1 amino despreading circuit 2-3 is connected to the delay circuit T C 2-5. Further, the signal is delayed by the time difference between the preceding wave and the delayed wave generated in the radio section, and N a2 despreading circuits 2-
The output of 4 is connected to a delay circuit T S 2-6. And
Delayed by one information symbol of the information transmission rate a2, the N a2 delay circuits T S 2-6 and the N a2 despreading circuits T
The output of the S 2-4 is connected to the delay circuit T C respectively.
Further, 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 radio section, and connected to the interference removing circuit 2-7. Interfering signals are removed. Next, the output of the interference removal 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。[0015] Incidentally, in this embodiment, the delay circuit is connected to the N a2 amino despreading circuit 2-4 T C 2-5
A delay circuit T S goes without saying that to obtain a similar effect even if the connection arrangement reversed with 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 a transmission signal sequence according to the present invention. In the figure, 3-1 indicates a transmission signal sequence of a wireless station having an information transmission speed a1 and 3-2 indicates a transmission signal sequence of a wireless station having an information transmission speed a2. The time required for transmitting one information symbol from the wireless station having the information transmission rate a1 corresponds to the time required for transmitting two information symbols from the wireless station having the information transmission rate a2. 1 for received signal
In the case of demodulating information symbols, a signal corresponding to two information symbols out of signals received from a radio station having an information transmission rate a2 becomes an interference signal. In 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 are provided. Two information symbols are input to the interference cancellation circuit, and the interference signal is canceled.
【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 an example of a specific configuration of the interference elimination circuit according to the present invention. In the figure, 4-1 indicates a tap coefficient generator, 4-2 indicates a multiplier, and 4-3 indicates an adder. (N a1
+ N a2 ) The outputs of the despreading circuits 1-3 and the outputs of the N a2 delay circuits are input. The multiplier 3-2 multiplies the output of the tap coefficient generator 3-1 for generating the tap coefficient by the output of the above 1-3 and 1-4, and outputs the output of the multiplier 3-2 to the adder 3-3. Input, and in the adder 3-3, (N
A signal obtained by adding a1 + Na2 ) 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 determining such that an error between the training signal and the output signal of the adder 3-3 is minimized (Kudo "Interference in DS / CDMA wireless communication") A Study of Elimination ”, IEICE Spring National Convention, B-392 (1994), and a method of determining from cross-correlation values between spreading codes (R. Lupus &
S. Verdu, “Linear Multiuse
r Detectorsfor Syschronou
s Code-Division Multiple-
Access Channels ”, IEEE Tr
actions on Information
Theory, vol. 35, no. 1 pp.
123-136 (1989)). Also, when the present interference elimination circuit is applied to the second embodiment, the preceding wave and the delayed wave of the desired signal can be multiplexed.
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 has been described. However, also in the case of a2> 2 × a1, a delay circuit is added, and signals for a large number of information symbols are input to the interference cancellation circuit. Thereby, a similar effect can be obtained.
Further, in each embodiment, the receiving apparatus of the wireless station having two kinds of information transmission speeds has been described, 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 cancellation circuit, the interference signal for the reception signal from the wireless station having the lowest information transmission rate is removed. can do. Also,
Since the output signals of the delay circuits connected to all the despreading circuits are connected to the interference elimination circuit, it is also possible to remove the delayed wave of the interference signal generated in the radio section.
【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 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 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 according to 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 illustrating a specific configuration example of an interference removal 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 Reverse Spreading circuit 2-5 Delay circuit T C 2-6 Delay circuit T S 2-7 Interference elimination circuit 2-8 Demodulation circuit 3-1 Transmission signal sequence of radio station at information transmission rate a1 3-2 Radio at information transmission rate a2 Station transmission signal sequence 4-1 Tap coefficient generator 4-2 Multiplier 4-2 Adder 5-1 Antenna 5-2 Receiver 5-2 Despreading circuit 5.4 Interference elimination circuit 5-5 Demodulation circuit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 1/69 - 1/713 H04J 13/00 - 13/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) H04B 1/69-1/713 H04J 13/00-13/06
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。A spread spectrum communication receiving apparatus for transmitting a plurality of information signals having a plurality of information transmission rates, each of which is spread and spread by a corresponding spreading code, and receiving the plurality of transmission signals simultaneously. A plurality of despreading circuits corresponding to the code, a plurality of delay circuits connected to the outputs of the respective despreading circuits other than the despreading circuit corresponding to the spreading code having the largest spreading factor; and An interference canceling circuit connected to an output of each of the delay circuits.
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 receiving apparatus for spread spectrum communication, wherein a plurality of information signals having a plurality of information transmission rates are spread and transmitted by a corresponding spreading code, and the plurality of transmission signals are received simultaneously. A plurality of despreading circuits corresponding to the codes; and a plurality of first despreading circuits connected to the outputs of the respective despreading circuits other than the despreading circuits corresponding to the spreading code having the largest spreading factor.
A plurality of second delay circuits connected to the respective outputs of the respective despreading circuits and the first delay circuit; the respective despreading circuits, the respective first delay circuits, and the respective 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 receiving apparatus for spread spectrum communication, wherein a plurality of information signals having a plurality of information transmission rates are spread and transmitted by a corresponding spreading code, and the plurality of transmission signals are received simultaneously. A plurality of despreading circuits corresponding to the codes; a plurality of third delay circuits connected to the outputs of the respective despreading circuits; and the despreading circuits other than the despreading circuits corresponding to the spreading code having the largest spreading factor. The outputs of the spreading circuits and their respective third
A plurality of fourth delay circuits respectively connected to the outputs of the delay circuits, and an interference canceling circuit connected to the respective outputs of the despreading circuits, the third delay circuits, and the fourth delay circuits. A receiving device for spread spectrum communication.
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 JPH0993220A (en) | 1997-04-04 |
| JP3208650B2 true JP3208650B2 (en) | 2001-09-17 |
Family
ID=26390045
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4963096A Expired - Fee Related JP3208650B2 (en) | 1995-07-13 | 1996-02-14 | Receiver for spread spectrum communication |
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| Country | Link |
|---|---|
| JP (1) | JP3208650B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1492368B1 (en) | 1997-04-17 | 2009-04-08 | NTT DoCoMo, Inc. | Base station apparatus and method for mobile communication system |
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1996
- 1996-02-14 JP JP4963096A patent/JP3208650B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0993220A (en) | 1997-04-04 |
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