JPH11331033A - Transmitter for band spread communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the transmitter that generates a spread signal by direct spread by various spread systems. SOLUTION: Cross control spread devices 201-203 that spread coded information signals by multipliers 111-113 select any of three kinds of spread systems according to control signals CCQS1-N. In the 1st spread system, an I arm PN code and a Q arm PN code are used as conventionally to conduct spread processing. In the 2nd spread system, either of the I arm PN code and the Q arm PN code is inverted, and the I arm PN code and the Q arm PN code are in crossing to produce the I arm PN code by using the Q arm PN code and to produce the Q arm PN code by using the I arm PN code thereby spreading the codes. In the 3rd spread system, the spread processing is conducted by combining the 1st and 2nd spread systems.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spread spectrum communication system, and more particularly to a transmitter for spreading an information signal to be transmitted by a direct spreading method.

[0002]

2. Description of the Related Art Spread-spectrum communication is a method of communicating with a signal having a transmission bandwidth wider than the bandwidth of an information signal to be transmitted. Such a spread spectrum communication system is classified into a direct sequence (DS) system, a frequency hopping (FH: Frequency Hopping) system, and a time hopping (TH: Time Hopping) system according to an information signal spreading method. Of these, the direct spreading method and the frequency jumping method are generally used, and these are frequency communication systems (TRS: Tr.
unked Radio System), Code Division Multiple Access (CDMA:
Code Division Multiple Access (Digital Cellular) System, Personal Cellular Communication System (PCS: Pers)
onal Communication System) and various fields such as satellite communication.

FIG. 1 shows a transmitter of a direct spread / code division multiple access (DS / CDMA) communication system in which an information signal is spread and transmitted by a direct spreading method.

In this transmitter, information signals d1 (t) to dN (t) to be transmitted are transmitted to respective orthogonal code generators 101 to 101.
The orthogonal codes w1 (t) to wN (t) generated by 103
Are multiplied by multipliers 111 to 113, respectively. Spreaders 141 to 143 are provided with I_PN code generator 120 and Q_
I-arm (I-a) generated by the PN code generator 130
rm) Using a PN (Pseudo Noise) code pI (t) and a Q-arm PN code pQ (t), spread the orthogonally coded information signals c1 (t) to cN (t) output from the multiplier to obtain I An arm spread signal s1I (t) to sNI (t) and a Q arm spread signal s1Q (t) to sNQ (t) are generated.
The adder 151 outputs the I-arm spread signals s1I (t) to sNI.
(T) are added to generate an I-arm sum signal xI (t), and the summer 152 outputs the Q-arm spread signals s1Q (t) to s1Q (t).
NQ (t) is added to generate a Q-arm sum signal xQ (t). The mixer 161 mixes the I-arm sum signal xI (t) and the in-phase component carrier wave cos ωct to output an I-arm modulation signal, and the mixer 162 outputs the Q-arm sum signal xQ (t) and a quadrature component. The Q-arm modulation signal is mixed with the carrier wave sin ωct to output a Q-arm modulation signal. Adder 170
Generates the transmission signal s (t) by adding the I-arm modulation signal and the Q-arm modulation signal. This transmission signal s (t) is
After power amplification through a bandpass filter, it is radiated through an antenna (not shown).

According to the prior art, diffusers 141 to 143 are used.
Is composed of multipliers 2 and 4 as shown in FIG. The multiplier 2 includes an orthogonal coded information signal c (t) output from the multipliers 111 to 113 at the preceding stage and an I_PN code generator 120.
To generate an I-arm spread signal sI (t) by multiplying by an I-arm PN code pI (t) generated by. Further, the multiplier 4 includes an orthogonally encoded information signal c (t) output from the multipliers 111 to 113 at the preceding stage and a Q-arm PN code pQ generated by the Q_PN code generator 130.
(T) to obtain a Q-arm spread signal sQ
(T) is generated.

A method of generating a spread signal by multiplying an I-arm information signal and a Q-arm information signal obtained by orthogonally encoding an I-arm PN code and a Q-arm PN code, respectively, as shown in FIG. No. 5,416,797 (Title of Invention: “System and Method for Generating Signa
l Waveforms in a CDMA Cellular Telephone Syste
m "). However, this scheme does not
The information signal is obtained by using the arm PN code and the Q arm PN code without modification (the I arm PN code and the Q arm PN code are multiplied by the I arm orthogonal coded information signal and the Q arm orthogonal coded information signal, respectively). Since the signals are spread, the I-arm sum signal and the Q-arm sum signal, and consequently the transmission signal s
The amplitude fluctuation of (t) is increased, and the number of on / off switching of the transmission signal is also increased. Such a phenomenon requires a high linearity of the power amplifier in the transmitter, but makes it difficult to recover the clock and the signal in the receiver.

As a technique for solving such a problem, US Pat. No. 5,712,869 (title of the invention:
“Data Transmitter and Receiver of a Spread Spectr
um Communication System Using a Pilot Channel ”)
Is disclosed. As another technique, there is Korean Patent Application No. 95-42989 (Title of Invention: "Direct spreading / code division multiple access communication system using pilot channel").

[0008]

However, regarding the generation of a spread signal in a spread spectrum communication system, since each device disclosed in the above-mentioned patent is fixed by any one structure, various spread methods are adopted. It is not suitable for systems that do this. For example, when a DS / CDMA communication system is installed, a spread signal generation system differs depending on the installation area (nation) of the system, and therefore a DS / CDMA communication system capable of supporting various spreading systems is required. Furthermore, a system that maintains compatibility with existing systems is required.

Accordingly, an object of the present invention is to provide an apparatus capable of generating a spread signal by direct spreading according to various systems in a spread spectrum communication system. It is another object of the present invention to provide an apparatus capable of ensuring compatibility between an existing spread signal generation method and a new spread signal generation method in a spread spectrum communication system. Further, it is another object of the present invention to provide a transmitter that generates a spread signal according to various spreading methods in a spread spectrum communication system, converts the spread signal into a transmission signal, and transmits the transmission signal.

[0010]

According to the present invention, an I-arm PN code generator and an Q-arm PN code generator generate an I-arm PN code generator for an encoded information signal to be transmitted. In a transmitter of a spread spectrum communication system in which spread is performed by using a spread signal, an I-arm spread signal and a Q-arm spread signal are generated by multiplying an encoded information signal by an I-arm PN code and a Q-arm PN code, respectively. A first spreading unit for generating an I-arm spread signal by multiplying the coded information signal by a Q-arm PN code and inverting and multiplying the coded information signal by inverting the I-arm PN code; , Or by inverting the Q-arm PN code and multiplying the coded information signal to generate an I-arm spread signal and adding the I-arm PN to the coded information signal. A second spreading unit that generates a Q-arm spread signal by multiplying the signals by a signal, a selecting unit that selects an I-arm spread signal and a Q-arm spread signal by any of these spreading units according to a spreading scheme determination signal, Is provided for each channel.

Alternatively, the encoded information signal to be transmitted is spread using an I-arm PN code by an I-arm PN code generator and a Q-arm PN code by a Q-arm PN code generator. In a transmitter of a spread spectrum communication system, a first spreading section for multiplying a coded information signal by an I-arm PN code and a Q-arm PN code to generate an I-arm spread signal and a Q-arm spread signal; The signal is multiplied by the I-arm PN code and the Q-arm PN code, respectively, to generate a first I-arm spread signal and a first Q-arm spread signal, and further, the encoded information signal is multiplied by the Q-arm PN code. As a result, the second I-arm spread signal is generated, and the I-arm PN is added to the encoded information signal.
The second Q-arm spread signal is generated by inverting and multiplying the sign, or the Q-arm PN is added to the encoded information signal.
A second I-arm spread signal is generated by inverting and multiplying the sign, and the I-arm P is added to the encoded information signal.
A second Q-arm spread signal is generated by multiplying the N code, and an I-arm spread signal is generated from the first and second I-arm spread signals, and the first and second Q-spread signals are generated.
A third spreading unit that generates a Q-arm spread signal from the arm spread signal; and a selection unit that selects an I-arm spread signal and a Q-arm spread signal by any of these spread units in accordance with a spreading scheme determination signal. The spreader having the configuration is provided for each channel.

Alternatively, the I-arm P-N code generator generates an I-arm P-N code for the encoded information signal to be transmitted.
In a transmitter of a spread spectrum communication system in which spreading is performed using an N code and a Q arm PN code by a Q arm PN code generator, a Q arm PN is added to the encoded information signal.
Multiplying the code to generate an I-arm spread signal and inverting the I-arm PN code of the coded information signal and multiplying the coded information signal to generate a Q-arm spread signal; A second spreading unit that generates an I-arm spread signal by inverting and multiplying the code and generates a Q-arm spread signal by multiplying the coded information signal by an I-arm PN code; A first I-arm spread signal and a first Q-arm spread signal are generated by multiplying the arm PN code and the Q-arm PN code, respectively. Generating the second Q-arm spread signal by generating the second I-arm spread signal and inverting and multiplying the coded information signal by the I-arm PN code; or A second I-arm spread signal is generated by inverting and multiplying the Q-arm PN code, and a second Q-arm spread signal is generated by multiplying the encoded information signal by the I-arm PN code; and A third spreading unit that generates an I-arm spread signal from the first and second I-arm spread signals and generates a Q-arm spread signal from the first and second Q-arm spread signals; A spreader configured to include an I-arm spread signal and a Q-arm spread signal according to the spread scheme determination signal is provided for each channel.

Further, an I-arm PN code generator generates an I-arm PN code for an encoded information signal to be transmitted.
In a transmitter of a spread spectrum communication system in which spreading is performed using a code and a Q-arm PN code by a Q-arm PN code generator, an I-arm PN code and a Q-arm PN code are respectively added to a coded information signal. A first spreading unit for multiplying to generate an I-arm spread signal and a Q-arm spread signal;
By multiplying the coded information signal by the Q-arm PN code,
An arm spread signal is generated and the encoded information signal is
A Q-arm spread signal is generated by inverting and multiplying the arm PN code, or an I-arm spread signal is generated by inverting and multiplying the coded information signal by inverting the Q-arm PN code. A second spreading unit that generates a Q-arm spread signal by multiplying the signal by an I-arm PN code; and a first I-arm spread signal and a first Q-arm spread signal using the same spreading method as the first spreading unit. Further, a second I-arm spread signal and a second Q-arm spread signal are generated by the same spreading scheme as the second spreading unit, and
A third spreading unit that generates an I-arm spread signal from the first and second I-arm spread signals and generates a Q-arm spread signal from the first and second Q-arm spread signals; A spreader configured to include an I-arm spread signal and a Q-arm spread signal according to the spread scheme determination signal is provided for each channel.

The first spreading section having the above spreading structure includes a multiplier for generating an I-arm spread signal by multiplying the coded information signal by an I-arm PN code, and a Q-arm PN code for the coded information signal. And a multiplier for multiplying to generate a Q-arm spread signal.

The second spreading section includes an inverter for inverting the Q-arm PN code, a multiplier for multiplying the coded information signal by the inverted Q-arm PN code to generate an I-arm spread signal, A multiplier for generating a Q-arm spread signal by multiplying the encoded information signal by an I-arm PN code;
Alternatively, an inverter for inverting the I-arm PN code, a multiplier for multiplying the coded information signal by the Q-arm PN code to generate an I-arm spread signal, and an inverting I-arm PN code for the coded information signal And a multiplier for multiplying to generate a Q-arm spread signal. The inverter may be a multiplier that multiplies the Q-arm PN code or the I-arm PN code by a “−1” value.

Further, the third spreading section has the same configuration as the first spreading section, and generates first I-arm spread signal and first Q-arm spread signal, and the same as the second spreading section. A second spreading means having a configuration to generate a second I-arm spread signal and a second Q-arm spread signal; and adding the first I-arm spread signal and the second I-arm spread signal to add an I-arm spread signal An adder that outputs a signal and an adder that adds the first Q-arm spread signal and the second Q-arm spread signal and outputs a Q-arm spread signal can be configured.

The selecting section selects a first I-arm spread signal from one of the spreading sections in accordance with the spreading scheme determination signal, and a second spreading section selects the Q-arm spread signal from one of the spreading sections. And a second selection unit that selects according to the determination signal.

In such a transmitter, an orthogonal code generator for generating an orthogonal code for each channel, and an information signal for each channel multiplied by the orthogonal code by the orthogonal code generator, respectively, are used to encode the coded information signal for each channel. , An I-arm spread signal output from each channel spreader to generate an I-arm sum signal, and a Q-arm spread signal output from each channel spreader And a mixer for mixing the first carrier with the I-arm sum signal to generate an I-arm modulation signal, and a mixer for mixing the Q-arm sum signal with the second carrier. A mixer that generates a Q-arm modulation signal and an adder that adds the I-arm modulation signal and the Q-arm modulation signal to generate a transmission signal can be provided.

[0019]

FIG. 3 shows a DS / CD according to the present invention.
2 shows a configuration example of a transmitter of an MA communication system. This transmitter uses the conventional spreaders 141 to 141 shown in FIG.
Unlike 143, cross control spreaders 201 to 203 controlled by control signals CCQS1 to CCQSN, respectively.
Is provided. Control signals CCQS1 to CCQSN are signals for determining a method of generating spread signals by spreaders 201 to 203.

Such cross control diffusers 201 to 203
In the case of the first spreading method shown in FIG. 5, when the orthogonally coded information signal is spread by the I-arm PN code and the Q-arm PN code to generate the I-arm spread signal and the Q-arm spread signal, In a manner, an I-arm PN code can be used to generate an I-arm spread signal and a Q-arm PN code can be used to generate a Q-arm spread signal.

In the case of the second spreading method shown in FIGS. 6 and 7, an I-arm spread signal and a Q-arm spread signal are generated by spreading an orthogonally coded information signal using an I-arm PN code and a Q-arm PN code. In some cases, the supply is performed in such a manner that the I-arm PN code and the Q-arm PN code cross each other. That is,
A Q-arm PN code can be used to generate an I-arm spread signal, and an I-arm PN code can be used to generate a Q-arm spread signal. At this time, the I-arm PN code and Q
Any one of the arm PN codes is inverted.

Further, in the case of the third spreading method shown in FIG.
The first spreading method and the second spreading method are used in combination. That is, the third spreading method is an I-arm spread signal sxI (t) generated according to the first and second spreading methods, respectively.
And syI (t) to add the I-arm spread signal scI
(T), and Q-arm spread signals sxQ (t) and syQ generated according to the first and second spreading schemes, respectively.
(T) is added to generate a Q-arm spread signal scQ (t).

As described above, the cross control diffuser 201 of this embodiment
203 have a structure that supports the first to third spreading methods. Cross control spreaders 201 and 2 employing first spreading method
03 is compatible with the conventional spreader shown in FIG. Also, the cross control spreaders 201 to 203 that employ the second spreading method together with the first spreading method can reduce the amplitude fluctuation of the transmission signal and the number of on / off switching. And a cross control spreader 20 employing a third spreading scheme that accommodates the first and second spreading schemes in one channel.
1 to 203 can also reduce the amplitude fluctuation of the transmission signal and the number of on / off switching.

Referring to FIG. 3, the first information signal d1 (t) to be transmitted is multiplied by a first orthogonal code w1 (t) generated from a first orthogonal code generator 101 by a multiplier 111, and An orthogonally encoded information signal c1 (t) is generated.
Then, the first cross control spreader 201 outputs the I-arm PN code pI (t) generated by the I_PN code generator 120.
And the Q arm P generated by the Q_PN code generator 130
A first orthogonal coded information signal c using the N code pQ (t)
1 (t) to spread the first I-arm spread signal s1I
(T) and the first Q-arm spread signal s1Q (t) are generated.

The second information signal d2 (t) to be transmitted is the second information signal d2 (t).
Second orthogonal code w2 generated from orthogonal code generator 102
(T) is multiplied by the multiplier 112 to generate a second orthogonally encoded information signal c2 (t). Then, the second cross control spreader 202 uses the I-arm PN code pI (t) generated by the I_PN code generator 120 and the Q-arm PN code pQ (t) generated by the Q_PN code generator 130 to generate a second signal. The orthogonal coded information signal c2 (t) is spread to generate a second I-arm spread signal s2I (t) and a second Q-arm spread signal s2Q (t).

Similarly, the N-th information signal dN (t) is multiplied by the N-th orthogonal code wN (t) generated from the N-th orthogonal code generator 103 by the multiplier 113, and the N-th orthogonal code The generated information signal cN (t) is generated. Then, the N-th cross control spreader 203 outputs the I_PN code generator 12
0 generated by the I-arm PN code pI (t) and Q_P
Q arm PN code p generated by N code generator 130
Q (t) and the N-th orthogonal coded information signal cN
(T) is spread, and the N-th I-arm spread signal sNI
(T) and the Nth Q-arm spread signal sNQ (t) are generated.

The generated I-arm spread signal s1I (t)
To sNI (t) by the adder 151 to obtain I
An arm sum signal xI (t) is generated. The Q-arm spread signals s1Q (t) to sNQ (t) are added to a summer 152.
, A Q-arm sum signal xQ (t) is generated. The I-arm sum signal xI (t) is supplied to the mixer 161.
Is mixed with the in-phase component carrier wave cos ωct to generate an I-arm modulation signal, and the Q-arm sum signal xQ
(T) is the carrier wave si of the quadrature component by the mixer 162.
n ωct to generate a Q-arm modulated signal. Then, the I output from each of the mixers 161, 162
The transmission signal s (t) is generated by adding the arm modulation signal and the Q arm modulation signal by the adder 170.
The transmission signal s (t) is radiated through an antenna (not shown) after passing through a band-pass filter and amplifying power.

The orthogonal code generators 101 to 103
It can be configured as a sh code generator. Then, as shown in FIG. 4, the cross control spreaders 201 to 203 transmit control signals CCQS1 to CCQSN which are spread scheme determination signals.
The spread signal is generated by the method selected by.

Referring to FIG. 4, cross control spreader 201
To 203 are first spreading units 21 that support the first spreading method.
0, a second spreading unit 220 supporting the second spreading method, a third spreading unit 230 supporting the third spreading method by a combination of the first spreading method and the second spreading method, a first selecting unit 240, a second
It comprises a selection unit 250. Among them, the first selection unit 240 and the second selection unit 250 transmit the I-arm spread signal and the I-arm spread signal by one of the first spreading unit 210, the second spreading unit 220, and the third spreading unit 230 according to the control signal CCQS. A Q-arm spread signal is selected and output.

The first spreading section 210 has an I-arm PN code p
Using I (t) and Q-arm PN code pQ (t) to spread orthogonally coded information signal c (t), I-arm spread signal s
aI (t) and a Q-arm spread signal saQ (t) are generated. The second spreading section 220 outputs the I-arm PN code pI (t)
And the Q-arm PN code pQ (t) are used in reverse to the first method to spread the orthogonally encoded information signal c (t) to generate an I-arm spread signal sbI (t) and a Q-arm spread signal sbQ (t). I do. The third spreading section 230 spreads the orthogonally coded information signal c (t) by combining the first scheme and the second scheme.
Arm spread signal scI (t) and Q arm spread signal scQ
(T) is generated.

The generated I-arm spread signal saI
(T), sbI (t), and scI (t) are applied to the signal input terminals A, B, and C of the first selection unit 240, respectively, and the generated Q-arm spread signals saQ (t), sbQ (t), s
cQ (t) is applied to signal input terminals A, B, and C of the second selector 250, respectively. The first selection unit 240 responds to the control signal CCQS applied to the selection signal input terminal (SEL) by using the I-arm spread signals saI (t), sbI (t),
scI (t) is selected, and the output terminal (O
UT) as an I-arm spread signal sI (t). Further, the second selection unit 250 has a selection signal input terminal (SE
L), selects one of the Q-arm spread signals saQ (t), sbQ (t), and scQ (t) in response to the control signal CCQS applied thereto, and outputs the Q-arm spread signal from the output terminal (OUT). Output as sQ (t).

First to third diffusion units 210, 220, 230
Has the configuration shown in FIGS. 5, 6 (FIG. 7) and FIG. 8, respectively.

The first spreading section 210 shown in FIG. 5 includes two multipliers 211 and 212. The multiplier 211 outputs the orthogonally encoded information signal c (t) and the I-arm PN code pI.
(T) to generate an I-arm spread signal saI (t), and a multiplier 212 multiplies the orthogonal coded information signal c (t) by the Q-arm PN code pQ (t) to produce a Q-arm spread signal s
Generate aQ (t). Thus, the first diffusion unit 210
Generates an I-arm spread signal using the I-arm PN code pI (t), and generates a Q signal using the Q-arm PN code pQ (t).
Generate an arm spread signal. That is, the first diffusion unit 21
0, the I-arm P
N code pI (t) is applied, and Q arm P
An N code pQ (t) is applied. This first diffusion unit 210
Is as in the following equation 1.

## EQU1 ## saI (t) = c (t) .pI (t) saQ (t) = c (t) .pQ (t)

The second spreading section 220 shown in FIG. 6A includes three multipliers 211, 212, and 213. The multiplier 211 multiplies the orthogonally encoded information signal c (t) by the inverted Q-arm PN code to obtain an I-arm spread signal sbI.
(T), and the multiplier 212 outputs the orthogonally encoded information signal c.
(T) is multiplied by the I-arm PN code pI (t) to generate a Q-arm spread signal sbQ (t). The multiplier 213 is
The Q-arm PN code is inverted by multiplying the Q-arm PN code pQ (t) by the value of “−1”. As described above, the second spreading section 220 performs the sign-inverted Q
An I-arm spread signal is generated using the arm PN code,
A Q-arm spread signal is generated using the arm PN code pI (t). That is, the Q-arm PN code after code inversion is cross-applied to the I-arm and the I-arm PN code pI is applied to the Q-arm by the spread signal generation operation of the second spreading section 220.
(T) is cross-applied. The operation of the second diffusion unit 220 is as in the following Expression 2.

SbI (t) = − c (t) · pQ (t) sbQ (t) = c (t) · pI (t)

FIG. 6B shows another example of the second diffusion unit 2.
20 includes multipliers 211, 212, and 214.
The multiplier 211 multiplies the orthogonally encoded information signal c (t) by the Q-arm PN code pQ (t) to obtain an I-arm spread signal s.
The multiplier 212 generates bI (t), and the multiplier 212 multiplies the orthogonally encoded information signal c (t) by the inverted I-arm PN code to generate a Q-arm spread signal sbQ (t). Multiplier 2
14 multiplies the I-arm PN code pI (t) by the value “−1” to generate a sign-inverted I-arm PN code. Thus, second spreading section 220 generates a Q-arm spread signal using the inverted I-arm PN code, and generates an I-arm spread signal using the Q-arm PN code pQ (t). That is, the Q signal PN code is cross-applied to the I arm and the I arm PN code after code inversion is cross-applied to the Q arm by the spread signal generation operation of the second spreading section 220. The operation of the second diffusion unit 220 is as shown in the following Expression 3.

SbI (t) = c (t) · pQ (t) sbQ (t) = − c (t) · pI (t)

The second spreading section 220 employs the structure shown in FIG. 6A to generate a spread signal of the form shown in Equation 2, and FIG. 6B to generate a spread signal of the form shown in Equation 3. Can be adopted. The spreading unit shown in FIG. 6A and the spreading unit shown in FIG.
And a different form of the spread signal as shown in Equation 3, which have the same effect. The effect obtained by the second spreading unit 220 is that the first spreading method is used for a part of the N channels and the remaining is compared with the case where the first spreading unit 210 is used for all the N channels. With the structure using the second spreading method, the amplitude fluctuation of the transmission signal and the number of on / off switching can be reduced.

FIG. 7 shows possible variations of the second diffusion section 220. That is, for example, FIG.
In the case of the second spreading unit 220 shown in (2), an operation of multiplying the Q-arm PN code pQ (t) by a value of “−1” to invert the Q-arm PN code pQ (t) is performed by the inverter 221. . In the case of the second spreading unit 220 shown in FIG. 6B, the operation of inverting the I-arm PN code pI (t) by multiplying the I-arm PN code pI (t) by the value “−1” is performed by the inverter. 222. FIG. 7 including FIGS. 6A and 6B
The same effects can be obtained with various configurations shown in FIG.

The inversion of the Q-arm PN code pQ (t) includes the case where the inverters 223 and 225 are used instead of the inverter 221. Any of these can obtain the same function. That is, the inversion operation is performed by the inverters 221,
Regardless of which of 223 and 225 is performed, the resulting spread signal has the same form as Equation 2. The inversion of the I-arm PN code pI (t) is performed by the inverter 222.
, Instead of the inverters 224 and 226, and any of these can provide the same function. That is, no matter which of the inverters 222, 224, and 226 performs the inversion operation, the resulting spread signal has the same form as that of Expression 3.

The third spreading unit 230 shown in FIG. 8 includes a first spreading unit 210 ′, a second spreading unit 220 ′, an adder 231,
232. That is, the first diffusion means 21
Third diffusion unit 230 including 0 'and second diffusion means 220'
Adopts a third spreading scheme that combines the first and second spreading schemes in order to reduce the amplitude fluctuation of the transmission signal and the number of on / off switching.

In the third spreading section 230, the orthogonally encoded information signal c (t) of the input signal is input to the x-arm and the y-arm, and the x-arm orthogonally encoded information signal cx (t) and the y-arm orthogonally encoded signal An information signal cy (t) is formed. In the x-arm, the first spreading means 210 'includes an I-arm PN code pI (t) and a Q-arm PN code pQ (t).
Orthogonally coded information signal cx in the first spreading scheme using
(T) is spread, and a first I-arm spread signal sxI (t) and a first Q-arm spread signal sxQ (t) resulting from the spreading are output. In the y-arm, the second diffusion means 220 '
Are the I-arm PN code pI (t) and the Q-arm PN code p
The orthogonally coded information signal cy (t) is spread by the second spreading method using Q (t), and the resulting second I-arm spread signal syI (t) and the second Q-arm spread signal syQ
(T) is output. Then, the first I in the x arm
The adder 231 adds the arm spread signal sxI (t) and the second I-arm spread signal syI (t) in the y-arm to generate an I-arm spread signal scI (t),
First Q-arm spread signal sxQ (t) in x-arm
And the second Q-arm spread signal syQ in the y-arm
And (t) are added by the adder 232 to generate a Q-arm spread signal scQ (t). That is, the adder 231
Of the spread signals generated by the first spreading means 210 'and the second spreading means 220', combine the I-arm spread signals to generate an I-arm spread signal scI according to the third spreading scheme.
(T), and the adder 232 outputs the first
A Q-arm spread signal scQ (t) according to the third spreading scheme is generated by combining the Q-arm spread signal among the 0 'and the spread signal generated by the second spreading means 220'.

FIG. 8 shows that the adders 231 and 232 are included in the third spreading section 230. However, the adders 231 and 232 can be provided outside the third spreading section 230. Further, the first diffusing unit 210 'formed inside the third diffusing unit 230 has the structure shown in FIG. 5, and the second diffusing unit 220' has the structure shown in FIG.

For example, the third diffusion unit 230 is composed of the first diffusion unit 210 'and the second diffusion unit 22 having the structure shown in FIG. 6A.
In the case of a configuration including “0”, the spreading operation by the third spreading unit 230 is as in the following Expression 4. On the other hand, when the third spreading unit 230 has a configuration including the first spreading unit 210 ′ and the second spreading unit 220 ′ having the structure shown in FIG. 6B, the spreading operation by the third spreading unit 230 is expressed by the following equation (5). It is as follows.

## EQU00004 ## scI (t) = sxI (t) + syI (t) = cx (t) .pi (t) -cy (t) .pQ (t) = c (t). [PI (t) -pQ (T)] scQ (t) = sxQ (t) + syQ (t) = cx (t) · pQ (t) + cy (t) · pI (t) = c (t) · [pI (t) + pQ (t) )]

## EQU5 ## scI (t) = sxI (t) + syI (t) = cx (t) .pi (t) + cy (t) .pQ (t) = c (t). [PI (t) + pQ (t )] ScQ (t) = sxQ (t) + syQ (t) = cx (t) · pQ (t) −cy (t) · pI (t) = c (t) · [pQ (t) −pI (t )]

Referring to FIG. 3, each of the cross control spreaders 201 to 203 of N channels transmits a spreading scheme decision signal CC.
5, 7 (FIG. 6), FIG. 8 according to QS1-CCQSN
With one of the following configurations. For example, "CCQS1 = 1
If (01) ”, the cross control spreader 201 has the configuration of the first spreading scheme as shown in FIG. 5, and“ CCQS1 =
2 (10) ″, the cross control spreader 201
(Or FIG. 6B) It becomes a structure of the 2nd spreading system as shown in FIG. If “CCQS1 = 3 (11)”, the cross control spreader 201 has the configuration of the third spreading scheme as shown in FIG. Spreading scheme decision signal CC for N channels
If QS1 to CCQSN are all the same value, cross control spreaders 201 to 203 have the same spreading structure,
Spreading scheme decision signals CCQS1-CCQ for N channels
If the SNs are different values, the cross control spreaders 201-20
3 will have different diffusion structures.

As described above, the spreading scheme decision signal CCQS
1 to CCQSN as appropriate, for example, “1”, “2”,
By setting any value of “3”, it is possible to reduce the amplitude fluctuation of the transmission signal and the number of on / off switchings while maintaining compatibility with the existing system.
For this purpose, each CROSSING CONTROL SPR
EADER) as shown in FIG.
S1 to CCQSN are received, and a spreading operation is performed by a method according to the received spreading method determination signals CCQS1 to CCQSN.

However, the spreading method decision signals CCQS1-CCQS1
If all of the CQSNs are "1" values, the circuit of FIG.
This is the same as the transmitter of the conventional DS / CDMA communication system shown in FIG. Since the transmitter having such a spread structure does not improve the amplitude fluctuation of the transmission signal and the number of on / off switching, it is preferably used only when the existing system is to be maintained.

FIGS. 10 to 13 show examples of spreading structures that not only maintain compatibility with existing systems, but also reduce the amplitude fluctuation and the number of on / off switching of the transmission signal.

According to the example of FIG. 10, the first information signal (1ST
SIGNAL) generates a first spread signal (1ST SPREAD SIGNAL) by spreading by a first spreading method (1ST SPREADING), and the second information signal (2ND SIGNAL) generates a second spreading signal (2ND SIGNAL).
SPREADING) to spread the second spread signal (2ND S
PREAD SIGNAL). Then, the third information signal (3R
D SIGNAL is spread by the first spreading method to generate a third spread signal (3RD SPREAD SIGNAL), and the fourth information signal (4TH SIGNAL) is spread by the second spreading method to generate a fourth spread signal (4TH SIGNAL). SPREAD SIGNAL). Or later,
The same method is repeated, and the N-th information signal (N-TH SIGNA
L) generates an N-th spread signal (N-TH SPREAD SIGNAL) by spreading by the second spreading method. That is, FIG.
The example of 0 is a structure in which the first spreading method and the second spreading method are used alternately for each channel.

According to the example of FIG. 11, the first information signal is the first information signal.
A first spread signal is generated by spreading by a spreading method, and a second spread signal is generated by spreading the second information signal by a second spreading method. Further, the third information signal is a third spreading signal (3RD SP
READING) to generate a third spread signal. Then, the fourth information signal is returned to the first spreading method and spread to generate a fourth spread signal, and the fifth information signal (5TH SI
GNAL) is the second spreading method, the sixth information signal (6TH SPREADIN)
G) is a fifth spreading signal (5TH) by the third spreading method.
SPREAD SIGNAL), 6th spread signal (6TH SPREAD SIGNA)
L). Thereafter, by repeating this, the N-th information signal is spread by the third spreading method to generate the N-th spread signal. That is, the example of FIG. 11 has a structure in which the first spreading method, the second spreading method, and the third spreading method are used one by one in order.

According to the example of FIG. 12, the first to third information signals are spread by the first spreading method to generate first to third spread signals, and the fourth to sixth information signals are spread to the second spread signal. The fourth to sixth spread signals are generated by spreading according to the method. Or later,
By repeating this, the N-th information signal is spread by the second spreading method to generate the N-th spread signal. That is,
The example of FIG. 11 has a structure in which the first spreading method and the second spreading method are used alternately for every three channels (a plurality of channels).

According to the example of FIG. 13, the first information signal is the first information signal.
The spreading method and the second information signal generate a first spreading signal and a second spreading signal, respectively, by the second spreading method. Hereafter, the third
The information signal is the first spreading method, the fourth information signal is the second spreading method, the fifth information signal is the first spreading method, and the sixth information signal is the second spreading method.
A third spreading signal, a fourth spreading signal, a fifth spreading signal, and a sixth spreading signal are generated by the spreading method, respectively. By repeating this, the N-th information signal is spread by the third spreading method to generate the N-th spread signal. That is, the example of FIG. 13 has a structure in which the first spreading method and the second spreading method are alternately used for each channel, and then the third spreading method is used for an arbitrary channel.

The examples of the transmitters shown in FIGS. 10 to 13 do not have a configuration fixed to only one of the first to third schemes, but a first spreading scheme that supports the first spreading scheme. Configuration including a first spreading unit and a second spreading unit supporting the second spreading method,
It is possible to adopt a mode including any two or more of the first to third schemes, such as a mode including a spreading unit, a second spreading unit, and a third spreading unit supporting the third spreading scheme. That is, the first
A flexible configuration is possible in which the spreading section, the second spreading section, and the third spreading section are arranged for each channel or for every several channels, or only an arbitrary channel is changed to another system. As described above, the transmitter having the free spreading structure includes the first spreading unit, thereby ensuring compatibility with the existing system, and using the first spreading unit and the second spreading unit mutually. Accordingly, it is possible to reduce the amplitude fluctuation of the transmission signal and the number of on / off switching.

For example, in the case of the transmitter of FIG. 3 in which the control signal CCQS is set so as to have a spreading structure as shown in FIG. 10, the cross control spreader 201 of the first channel and the cross control spreader 202 of the second channel are used. Looking at it, it looks like this.

In this case, the cross control spreader 201 supports the first spreading method, and the cross control spreader 202 supports the second spreading method. The cross control diffuser 20 at this time
1 has the structure shown in FIG. 5, and performs spreading on the orthogonally coded information signal c1 (t) of the first channel by using the I-arm PN code pI (t) and the Q-arm PN code pQ (t).
A channel I arm spread signal s1I (t) and a first channel Q arm spread signal s1Q (t) are generated. The cross control diffuser 202 has, for example, the structure of FIG.
Spreading is performed on the orthogonally encoded information signal c2 (t) of the second channel using the I-arm PN code pI (t) and the sign-reversed Q-arm PN code pQ (t), and the second channel I-arm spread signal s2I (T) and the second channel Q-arm spread signal s2Q (t).

The adder 151 includes a first channel I-arm spread signal s1I (t) and a second channel I-arm spread signal s1I (t).
2I (t) to generate an I-arm sum signal xI (t). The summer 152 includes a first channel Q-arm spread signal s1Q (t) and a second channel Q-arm spread signal s2Q.
(T) to generate a Q-arm sum signal xQ (t). The mixer 161 mixes the I-arm sum signal xI (t) and the in-phase component carrier wave cos ωct to output an I-arm modulation signal, and the mixer 162 outputs the Q-arm sum signal xQ (t) and a quadrature component. And outputs a Q-arm modulated signal. These mixers 16
Adder 170 adds the I-arm modulation signal and the Q-arm modulation signal output from 1, 162 to generate transmission signal s (t).

The mitigation of the amplitude fluctuation of the transmission signal s (t) at this time means the mitigation of the amplitude fluctuation of the I-arm sum signal xI (t) and the Q-arm sum signal xQ (t).
The decrease in the number of on / off switching of (t) means that the I-arm sum signal xI (t) and the Q-arm sum signal xQ (t) do not become “0” at the same time. Such an effect becomes clear from the following Table 1.

[Table 1]

In Table 1, c1 (t) is the first channel orthogonally coded information signal, c2 (t) is the second channel orthogonally coded information signal, pI (t) is the I-arm PN code, and pQ
(T) is a Q-arm PN code. xI1 (t) and x
Q1 (t) is an I-arm sum signal and a Q-arm sum signal generated when both of the cross control spreaders 201 and 202 have the configuration of the first spreading scheme as shown in FIG. Also,
xI2 (t) and xQ2 (t) are obtained when the cross control spreader 201 of the first channel has the first spreading scheme of FIG. 5 and the cross control spreader 202 of the second channel has the second spreading scheme of FIG. 6A. xI3 (t) and xQ3 (t) are for the case where the cross control spreader 201 of the first channel has the first spreading scheme of FIG. 5 and the cross control spreader 202 of the second channel has the second spreading scheme of FIG. 6B. is there.

In the case of xI2 (t) and xQ2 (t), the cross control spreader 202 provides an inverted Q-arm PN code applied to the I-arm and an I-arm P
An I-arm spread signal and a Q-arm spread signal are generated using the N code. In the case of xI3 (t) and xQ3 (t), the cross control spreader 202 outputs the Q arm PN code applied to the I arm and the inverted I PN code applied to the Q arm.
An I-arm spread signal and a Q-arm spread signal are generated using the arm PN code.

Table 1 shows the case where the number of channels is 2, and the sum signal obtained by this is the orthogonally encoded information signal c1.
Cross control spreader 2 for spreading (t) by the first spreading method
01 and the I-arm spread signal and the Q-arm spread signal generated by the cross control spreader 202 that spreads the orthogonally coded information signal c2 (t) by the second spreading method.

The I-arm sum signal xI1 (t) and the Q-arm sum signal xQ1 obtained by summing the spread signals generated from the cross control spreaders 201 and 202, both of which are the first spreading method.
(T) is as shown in Expression 6 below. In the calculation of the I-arm sum signal and the Q-arm sum signal value, the “0” value shown in Table 1 indicates “+1”, and the “1” value indicates “−1”.

XI1 (t) = s1I (t) + s2I (t) = c1 (t) · pI (t) + c2 (t) · pI (t) xQ1 (t) = s1Q (t) + s2Q (t) = c1 (t) · pQ (t) + c2 (t) · pQ (t)

Cross control spreader 201 using first spreading method
Control spreader 2 using the second spreading method shown in FIG.
The I-arm sum signal xI2 (t) and the Q-arm sum signal xQ2 (t) obtained by summing the spread signals generated from H.02 are represented by the following equation (7). As described above, in the calculation of the I-arm sum signal and the Q-arm sum signal value, the “0” value indicates “+1” and the “1” value indicates “−1”.

XI2 (t) = s1I (t) + s2I (t) = c1 (t) · pI (t) −c2 (t) · pQ (t) xQ2 (t) = s1Q (t) + s2Q (t) = C1 (t) · pQ (t) + c2 (t) · pI (t)

A cross control spreader 201 of the first spreading method
Control spreader 2 using the second spreading method shown in FIG.
The I-arm sum signal xI3 (t) and the Q-arm sum signal xQ3 (t) obtained by summing the spread signals generated from H.02 are represented by the following equation (8). As described above, in the calculation of the I-arm sum signal and the Q-arm sum signal value, the “0” value indicates “+1” and the “1” value indicates “−1”.

XI3 (t) = s1I (t) + s2I (t) = c1 (t) · pI (t) + c2 (t) · pQ (t) xQ3 (t) = s1Q (t) + s2Q (t) = c1 (t) · pQ (t) −c2 (t) · pI (t)

When the I-arm sum signal and the Q-arm sum signal are obtained by the equations (6) to (8), the transmission signal s (t) finally generated from the adder 170 of FIG. Table 2 below.

[Table 2]

In Table 2, Vrms1 and power 1 indicate the Vrms value and the power value of the transmission signal generated when both of the cross control spreaders 201 and 202 have the configuration of the first spreading method. On the other hand, Vrms2 and power 2 are equal to V of the transmission signal generated when cross control spreader 201 has the first spreading scheme and cross control spreader 202 has the second spreading scheme.
The rms value and the power value are shown.

As can be seen from the table, the cross control diffuser 20
The Vrms value and the power value of the transmission signal generated in the case where both of the signals 1202 and 202 are the first spreading method have large amplitude fluctuations and on / off switching numbers. That is, the power value of the transmission signal has a large amplitude variation value such as “8” or “0”, and the power value is switched from 8 to 0 or from 0 to 8.

On the other hand, the cross control spreader 201
Vrms of the transmission signal generated when the spreading method and the cross control spreader 202 are configured by the second spreading method as shown in FIG.
The value and the power value have a constant value (2 / √2, 2), and there is no on / off switching phenomenon.

As described above, when the spreading structure of the transmitter is set as in the examples shown in FIGS. 10 to 13, the amplitude fluctuation and on / off switching of the transmission signal generated in the existing spreading structure shown in FIG. The number can be reduced. That is, the first spreading method and the second spreading method are alternately used for each channel, or the first spreading method to the third spreading method are used in order for each channel, so that one spreading method is used. It is possible to solve the problem in the conventional case using a fixed configuration transmitter.

Although the specific embodiments have been described above, it is apparent that various other embodiments are possible. For example, the present invention is not limited to the application example to the DS / CDMA communication system, but can be applied to other spread spectrum communication systems. Also, an example in which the orthogonally coded information signal is spread has been described. However, the present invention can be similarly applied to coded information signals using a method other than the orthogonal code.

[0068]

According to the present invention, in a DS / CDMA communication system, any one of different spreading schemes can be selectively applied to each channel, whereby an information signal is spread by various spreading schemes and the spread signal is transmitted. And transmit it. According to the present invention, since different spreading schemes are supported flexibly for each channel, the amplitude fluctuation of the transmission signal is reduced and the number of on / off switching is reduced while maintaining compatibility with the conventional system. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a transmitter in a conventional DS / CDMA communication system.

FIG. 2 is a block diagram showing a configuration of diffusers 141 to 143 shown in FIG.

FIG. 3 is a block diagram showing a main configuration of a transmitter in the DS / CDMA communication system according to the present invention.

FIG. 4 is a block diagram showing a configuration of cross control spreaders 201 to 203 shown in FIG. 3;

FIG. 5 is a block diagram showing a configuration of a first diffusion unit shown in FIG. 4;

FIG. 6 is a block diagram showing a configuration of a second diffusion unit shown in FIG. 4;

FIG. 7 is a block diagram showing another modification of the second diffusion unit shown in FIG. 4;

FIG. 8 is a block diagram showing a configuration of a third diffusion unit shown in FIG. 4;

FIG. 9 is a block diagram illustrating that cross control spreaders 201 to 203 determine a spreading scheme according to a spreading scheme determination signal CCQS.

FIG. 10 is a block diagram showing a setting example of each of the cross control spreaders 201 to 203 of FIG. 3;

FIG. 11 is a block diagram showing another setting example of each of the cross control spreaders 201 to 203 of FIG. 3;

FIG. 12 is a block diagram showing another setting example of each of the cross control spreaders 201 to 203 of FIG. 3;

FIG. 13 is a block diagram showing another setting example of each of the cross control spreaders 201 to 203 of FIG. 3;

Claims (13)

[Claims] 1. An encoded information signal to be transmitted,
In a transmitter of a spread spectrum communication system in which spreading is performed using an I-arm PN code generated by an I-arm PN code generator and a Q-arm PN code generated by a Q-arm PN code generator, A first spreading unit that multiplies the I-arm PN code and the Q-arm PN code to generate an I-arm spread signal and a Q-arm spread signal, and multiplies the coded information signal by the Q-arm PN code. A Q-arm spread signal is generated by generating an I-arm spread signal and inverting and multiplying the coded information signal by the I-arm PN code, or by adding the Q-arm PN code to the coded information signal. An I-arm spread signal is generated by inverting and multiplying, and Q is obtained by multiplying the coded information signal by the I-arm PN code.
A spreader having a configuration including: a second spreading unit that generates an arm spreading signal; and a selecting unit that selects an I-arm spreading signal and a Q-arm spreading signal by one of the spreading units according to a spreading scheme determination signal. , A transmitter provided for each channel. 2. An encoded information signal to be transmitted,
In a transmitter of a spread spectrum communication system in which spreading is performed using an I-arm PN code generated by an I-arm PN code generator and a Q-arm PN code generated by a Q-arm PN code generator, A first spreading unit that multiplies the I-arm PN code and the Q-arm PN code to generate an I-arm spread signal and a Q-arm spread signal, respectively, the I-arm PN code and the Q-arm PN Respectively, to generate a first I-arm spread signal and a first Q-arm spread signal, and further multiply the encoded information signal by the Q-arm PN code to obtain a second I-arm spread signal. A second Q-arm spread signal by generating a signal and inverting and multiplying the coded information signal by the I-arm PN code; or A second I-arm spread signal is generated by inverting and multiplying the Q-arm PN code by the broadcast signal, and a second Q-arm spread signal is generated by multiplying the encoded information signal by the I-arm PN code. And a third spreading unit that generates an I-arm spread signal from the first and second I-arm spread signals and generates a Q-arm spread signal from the first and second Q-arm spread signals. And a selector for selecting an I-arm spread signal and a Q-arm spread signal by any one of the spreading units according to a spreading scheme determination signal. Transmitter. 3. An encoded information signal to be transmitted,
In a transmitter of a spread spectrum communication system in which spreading is performed using an I-arm PN code generated by an I-arm PN code generator and a Q-arm PN code generated by a Q-arm PN code generator, Generating an I-arm spread signal by multiplying the Q-arm PN code, and generating a Q-arm spread signal by inverting and multiplying the coded information signal by inverting the I-arm PN code; or An I-arm spread signal is generated by inverting and multiplying the information signal by the Q-arm PN code, and Q is obtained by multiplying the encoded information signal by the I-arm PN code.
A second spreading unit for generating an arm spread signal; a first I-arm spread signal and a first Q-arm spread signal obtained by multiplying the coded information signal by the I-arm PN code and the Q-arm PN code, respectively. And further multiplies the coded information signal by the Q-arm PN code to generate a second I-arm spread signal and inverts and multiplies the coded information signal by inverting the I-arm PN code. To generate a second Q-arm spread signal, or to generate a second I-arm spread signal by inverting and multiplying the coded information signal by inverting the Q-arm PN code. A second Q-arm spread signal is generated by multiplying the signal by the I-arm PN code, and an I-arm spread signal is generated from the first and second I-arm spread signals. A third spreading unit for generating a Q-arm spread signal from the first and second Q-arm spread signals; and an I-arm spread signal and a Q-arm spread signal from one of the spreading units according to a spreading scheme determination signal. A transmitter, comprising: a spreader having a configuration having a selecting unit for each channel. 4. An encoded information signal to be transmitted,
In a transmitter of a spread spectrum communication system in which spreading is performed using an I-arm PN code generated by an I-arm PN code generator and a Q-arm PN code generated by a Q-arm PN code generator, A first spreading unit that multiplies the I-arm PN code and the Q-arm PN code to generate an I-arm spread signal and a Q-arm spread signal, and multiplies the coded information signal by the Q-arm PN code. A Q-arm spread signal is generated by generating an I-arm spread signal and inverting and multiplying the coded information signal by the I-arm PN code, or by adding the Q-arm PN code to the coded information signal. An I-arm spread signal is generated by inverting and multiplying, and Q is obtained by multiplying the coded information signal by the I-arm PN code.
A second spreading unit for generating an arm spread signal; a first I-arm spread signal and a first Q-arm spread signal generated by the same spreading method as the first spreading unit;
Generating a second I-arm spread signal and a second Q-arm spread signal by the same spreading scheme as the second spreading unit;
A third spreading unit that generates an I-arm spread signal from the first and second I-arm spread signals and generates a Q-arm spread signal from the first and second Q-arm spread signals; A transmitter, comprising: a selector configured to select an I-arm spread signal and a Q-arm spread signal by one of the spreaders in response to each channel. 5. A first spreading unit for multiplying an encoded information signal by an I-arm PN code to generate an I-arm spread signal, and a multiplier for multiplying the encoded information signal by a Q-arm PN code to generate a Q signal. 5. The transmitter according to claim 1, further comprising a multiplier for generating an arm spread signal. 6. A second spreading unit, comprising: an inverter for inverting a Q-arm PN code; a multiplier for multiplying an encoded information signal by the inverted Q-arm PN code to generate an I-arm spread signal; 5. The transmitter according to claim 1, further comprising: a multiplier configured to multiply the encoded information signal by an I-arm PN code to generate a Q-arm spread signal. 7. A second spreading unit, comprising: an inverter for inverting the I-arm PN code; a multiplier for multiplying the coded information signal by the Q-arm PN code to generate an I-arm spread signal; 5. The transmitter according to claim 1, further comprising a multiplier for multiplying the signal by the inverted I-arm PN code to generate a Q-arm spread signal. 8. The transmitter according to claim 6, wherein the inverter is a multiplier that multiplies the Q-arm PN code or the I-arm PN code by a value of “−1”. 9. A multiplier for multiplying an encoded information signal by an I-arm PN code to generate a first I-arm spread signal, and a Q-arm PN code to the encoded information signal. First spreading means comprising a multiplier for multiplying to generate a first Q-arm spread signal; an inverter for inverting the Q-arm PN code;
A multiplier for multiplying an arm PN code to generate a second I-arm spread signal, and a multiplier for multiplying the encoded information signal by the I-arm PN code to generate a second Q-arm spread signal A second spreading means, and adding the first I-arm spread signal and the second I-arm spread signal to obtain
3. An adder for outputting an arm spread signal, and an adder for adding the first Q arm spread signal and the second Q arm spread signal to output a Q arm spread signal. The transmitter according to claim 3 or claim 4. 10. A multiplier for multiplying the coded information signal by an I-arm PN code to generate a first I-arm spread signal, and a Q-arm PN signal for the coded information signal.
A first spreading means comprising a multiplier for multiplying a code to generate a first Q-arm spread signal; an inverter for inverting the I-arm PN code;
A multiplier for multiplying the N code to generate a second I-arm spread signal, and a multiplication for generating a second Q-arm spread signal by multiplying the coded information signal by the inverted I-arm PN code Second spreading means comprising an adder, an adder for adding the first I-arm spread signal and the second I-arm spread signal and outputting an I-arm spread signal, and the first Q-arm spread signal 5. The transmitter according to claim 2, further comprising: an adder for adding the second Q-arm spread signal and the second Q-arm spread signal to output a Q-arm spread signal. 11. A selecting section for selecting an I-arm spread signal from any of the spreading sections according to a spreading scheme determination signal, and spreading the Q-arm spread signal from any of the spreading sections. The transmitter according to any one of claims 1 to 10, further comprising a second selection unit that selects according to a system determination signal. 12. An orthogonal code generator for generating orthogonal codes for each channel, and a multiplier for generating an encoded information signal for each channel by multiplying each channel information signal by the orthogonal code generated by the orthogonal code generator. Claims 1 to 1 comprising:
2. The transmitter according to claim 1. 13. An I output from a spreader of each channel.
A summer for summing arm spread signals to generate an I-arm sum signal; a summer for summing Q-arm spread signals output from the spreaders of the respective channels to generate a Q-arm sum signal; A mixer for mixing the first carrier with the summed signal to generate an I-arm modulation signal; a mixer for mixing the second carrier with the summed Q-arm signal to generate a Q-arm modulation signal; An adder for adding a modulation signal and the Q-arm modulation signal to generate a transmission signal;
13. The transmitter according to claim 12, comprising: