JP3168063B2 - Spread spectrum communication apparatus and communication method therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a vehicle, a ship, an aircraft, or other moving objects, or carried by a person.
In particular, the present invention relates to a spread spectrum communication apparatus for accessing a radio line of a CDMA radio communication system, and
And its communication method .

[0002]

2. Description of the Related Art Conventionally, in the field of mobile communications, communication forms,
Various systems have been constructed in accordance with communication contents, service targets, and other differences, and research and development on the application of new technologies have been actively conducted.

[0003] Among such techniques, a primary modulated signal generated by digitally modulating a carrier signal with transmission information is multiplied by a predetermined time-series spreading code to spread the frequency spectrum of the signal. Send
CDMA for recovering a primary modulated wave signal by performing correlation detection on the receiving side using the same sequence of spreading codes as the received wave
(Code Division Multiple Access) The communication system is rich in secrecy, has characteristics that are not easily affected by frequency selective fading and other fluctuations and interference / interference in a wireless transmission path, and has suitability as a random access communication system. Therefore, application to mobile communication systems as a promising multiple access scheme is being studied.

[0004]

However, since the mobile station device of such a mobile communication system is configured to provide a voice call service, a facsimile terminal device is provided in parallel with the call. And communication via a data terminal cannot be performed, and in order to perform communication in parallel with a call in this way, a mobile station device connected to a terminal adapted to the communication content had to be separately used. .

[0005] Further, by providing a plurality of transceivers in the mobile station device, it is possible to perform a plurality of communications in parallel as described above.
This has not been realized because the size and weight are physically large and the original requirements for mobile station devices such as miniaturization and weight reduction are not satisfied.

An object of the present invention is to provide a mobile station device capable of performing a plurality of communications in parallel using a small-scale circuit.

FIG. 1 is a block diagram showing the principle of the present invention.
The present invention relates to an antenna sharing unit 11 for transmitting and receiving antennas, a modulating unit 12 ₁ , 12 ₂ for individually modulating a single carrier signal by transmission information, a steep autocorrelation characteristic, and a code sequence. Code generating means 13 _{1 to} 13 ₄ for individually generating spread codes having a small cross-correlation, and the spread spectrum codes generated by the code generators 13 ₁ and 13 ₂ by modulating the frequency spectrum of each modulated carrier signal. , And spread processing means 14 ₁ , 14 ₂ for transmitting via the antenna sharing means 11 and code generating means 13 ₃ , 13 _{4 for} the components of the spreading code contained in the received wave obtained via the antenna sharing means 11. Synchronizing means 15 for phase synchronizing
The frequency spectrum of the received wave is converted into code generation means 1 respectively.
3 _3, 13 ₄ and despreading means 16 _1, 16 ₂ for despreading the spreading code generated by despreading processing unit 16
_The received waves despread by ₁ and 16 ₂ are individually demodulated,
It is characterized by including demodulation means 17 ₁ and 17 ₂ for restoring transmission information included in these received waves. Spread code generation
Raw unit pairs to the code generating means 13 ₁ and the code generator 13 ₂
And respond, spread processing section, spread processing means 14 ₁ and spread processing hand
Corresponding to stage 14 _2, transmitting means, an antenna or an antenna co
Means 11 and the like correspond.

[0008]

According to the present invention, the modulation means 12 ₁ , the diffusion processing means 1
4 _1, when the number of communication paths from the communication path formed via the inverse diffusion processing unit 16 ₁ and the demodulation means 17 ₁ is required, the diffusion processing unit 14 _2, spreading code generation means 13 ₂ is generated code, the modulation means 12 ₂ diffuses a frequency scan Bae Kutoramu the modulated carrier signal transmitted via the antenna sharing unit 11 by the transmission information. Furthermore, the inverse diffusion processing unit ₁₆₂ includes a code generating means 13 ₄ the synchronization means 15
The frequency spectrum of the received wave is despread by the spreading code which is output in phase synchronization with the component of the spreading code of the received wave under the synchronous control described above. Demodulation means 17 ₂ restores transmission information this way demodulates the despread received wave.

[0009] That is, the modulation unit 12 _2, the code generator 13 _2, 13 _4, the diffusion processing unit 14 _2, the inverse diffusion processing unit ₁₆₂ and the demodulation means 17 _2, respectively modulation means 12
₁ , code generating means 13 ₁ , 13 ₃ , spreading processing means 14 ₁ ,
In parallel with the wireless channel accessed via the despreading processing means 16 ₁ and the demodulation means 17 ₁ , a communication path via a wireless channel different from the channel is formed. to this
The number of communication paths according to the communication volume for a specific communication partner
Can be set. Further, each of these means is an antenna sharing means 11 and a synchronizing means 1 which are shared in the mobile station apparatus.
5 Since it can be constituted by a circuit having a small size and a small mounting area as compared with others, the requirements for miniaturization and weight reduction of the mobile station can be satisfied. Further, communication with a plurality of partners can be performed simultaneously.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a diagram showing one embodiment of the present invention.

In the figure, the input / output on the terminal side of the control unit 21 is connected to a handset and to a facsimile terminal, a computer and other data terminals via a predetermined plug. The audio output of the control unit 21 is an audio codec (CODE)
C) is connected to one input of a multiplier 24 ₁ via 22 _S and a modulator (MOD) 23 ₁ , and the output thereof is connected to _one of the hybrid (H) 27 via a frequency converter 25 ₁ and a power amplifier 26 _1. Connected to the input of An output of the hybrid 27 is connected to a transmission input terminal of an antenna duplexer (DUP) 28, and the antenna terminal is connected to an antenna 29. One data output of the control unit 21 is directly connected to the connection point between the modulator 23 of the _input and output of the audio codec 22 _S. The other data output of the control unit 21 is connected to one input of the multiplier 24 ₂ via a modulator (MOD) 23 _2, its output via a frequency converter 25 ₂ and the power amplifier 26 ₂ hybrid 27 Is connected to the other input. The output of the oscillator 30 is connected to the carrier signal input of the modulators 23 ₁ and 23 ₂ , and the frequency converters 25 ₁ and 2 2
5 The _second local oscillator inputs the output of the oscillator 31 is connected. The transmission control output of the control unit 21 is the power amplifier 26 ₁ , 26 ₂
Is connected to the control input. The reception output terminal of the antenna duplexer 28 is connected to one of the inputs of the multipliers 34 ₁ and 34 ₂ via the reception unit 32 and the synchronization unit 33. Multiplier 34
The output of ₁ is connected to the input of the detection unit 35 _first detects the input and synchronization control unit 36. The output of the detection unit 35 ₁ is connected to one data input of the control unit 21 and the audio codec (CODE).
C) 22 is connected to the _R input, the output of the control unit 21
Is connected to the voice input. The output of the multiplier 34 ₂ is connected to the detection input of the detection unit 35 _2, the output of which is connected to the other data input of the control unit 21. One output of the synchronization control unit 36 is connected to the synchronization input detection unit 35 _1, the other output of the synchronous control unit 36 is connected to the synchronization input detection unit 35 _2. The two channel setting outputs of the controller 21 are connected to the control inputs of the spreading pattern generators 37 ₁ and 37 ₂ , respectively. The output of the diffusion pattern generator 37 ₁ is the multiplier 2
4 _1, 34 is connected to one feedback input of the _first other input and synchronization unit 33, the other of the feedback of the diffusion pattern generation unit 37 outputs the ₂ multiplier 24 _2, 34 ₂ of the other input and the synchronization unit 33 Connected to input. The two synchronization control outputs of the synchronization unit 33 are output from the spread pattern generation units 37 ₁ and 37 ₁ , respectively.
Connected to ₂ sync inputs.

As to the correspondence between this embodiment and the block diagram shown in FIG. 1, the hybrid 27 and the antenna duplexer 28 correspond to the antenna sharing means 11, the modulator 23 corresponds to the modulation means 12, Pattern generator 37
Corresponds to the code generator 13, the multiplier 24, the frequency converter 25, the power amplifier 26 and the oscillator 31 correspond to the spreading processor 14, the receiver 32 and the synchronizer 33 correspond to the synchronizer 15, 34 corresponds to the despreading unit 16, and the detection unit 35 and the synchronization unit 36 correspond to the demodulation unit 17.

FIG. 3 is a diagram showing a configuration example of a mobile communication system to which the present embodiment is applied. In the figure, mobile stations 41 ₁ and 41 ₂ to which the present embodiment is applied are connected to a base station 42 via a CDMA communication wireless line, and the base station is connected to a public communication network.

FIG. 4 is a diagram for explaining the operation of the present embodiment. Hereinafter, the operation of this embodiment will be described with reference to FIGS. The control unit 21 of the mobile station 41 ₁ instructs the spread pattern generation unit 37 ₁ to generate a spread pattern corresponding to the control wireless channel based on the configuration of the wireless zone stored in the memory in advance, and the control unit 21 described above. The control radio channel controlled by the base station 42 is accessed via one data output and one data input.

[0015] In the access to such a control radio channel, to generate a primary modulated wave signal by modulating the control information output modulator 23 ₁ a carrier signal output from the oscillator 30 from the controller 21. Multiplier 24
₁ spreads the frequency spectrum of the signal by multiplying the primary modulated wave signal described above and a diffusion pattern which is output from the diffusion pattern generation unit 37 _1. Frequency converter 25
₁ performs frequency conversion processing by multiplying the is the local oscillation signal output from the signal and the oscillator 31 output from the multipliers 24 ₁ in this way, the power amplifier 26 ₁ is transmitted wave obtained by such process Is amplified to a predetermined power and transmitted to the base station 42 via the hybrid 27, the antenna duplexer 28 and the antenna 29.

Further, the received wave of the control radio channel is:
The signal is provided to the receiving unit 32 via the antenna 29 and the antenna duplexer 28. The reception unit 32 controls the reception wave under the control of an automatic gain control circuit (AGC) that corrects the level fluctuation of the reception wave and an automatic frequency control circuit (AFC) that matches the reception band with the occupied bandwidth of the reception wave. Is extracted. The synchronization unit 33 includes a synchronization acquisition circuit based on a predetermined method and a synchronization holding circuit (DLL) based on a delay lock tracking method. These circuits spread the components of the spread pattern included in the reception wave extracted by the reception unit 32. Pattern 3
7 _1, 37 is a phase synchronizing a spreading pattern output from the _2, and holds the synchronous state. The multiplier 34 ₁ is based on the diffusion pattern output this manner from the diffusion pattern generation unit 37 ₁ performs inverse diffusion processing opposite to the multiplier 24 ₁ to the receiving wave.

In the synchronization control unit 36, a carrier recovery circuit (C
R) performs predetermined signal processing on the signal obtained by such despreading processing to generate a reference carrier signal in which modulated wave components, noise and other unnecessary wave components are sufficiently suppressed. Further, the clock recovery circuit (BTR) recovers a clock synchronized with the control information included in the received wave. Detector 35 ₁
Detects the signal obtained by the above-described despreading processing based on the reference carrier signal and the clock, restores the control information transmitted from the base station 42, and gives the control information to the control unit 21.

The control unit 21 performs a predetermined control operation corresponding to the entry / exit area of the own station in opposition to the base station 42 by accessing the control radio channel in this way.
For example, in the process from when the mobile station 41 ₁ originates a call and starts a call with the mobile station 41 ₂ , the control unit 21 of the mobile station 41 ₁ sends the destination mobile station to the base station 42 according to the operation performed by the operator. 41 ₂ transmits a calling signal shown (FIG. 4). Base station 4
2 performs a predetermined call process according to each information included in the call signal, captures a vacant radio channel for communication (FIG. 5) when setting a communication path, and responds to the channel. the channel designation signal indicating the identification information P ₁ of the spreading code to the mobile station 41 ₁ (Fig. 4).

Mobile station 41₁Then, the control unit 21
Generation of a spreading code corresponding to such identification information
Turn generator 37₁Command. That is, the handset
The control unit 21 outputs a sound signal
Voice codec 22_S, Modulator 23₁, Multiplier 24₁, Lap
Wave number converter 25₁, Power amplifier 26₁, Hybrid 2
7, transmission through the antenna duplexer 28 and the antenna 29.
A transmission path is formed, and the mobile station 41₁Biography
For the downlink audio signal to be transmitted, antenna 29, antenna
Tenor duplexer 28, receiver 32, synchronizer 33, multiplier 34
₁, Detector 35 ₁, Voice codec 22_RAnd control unit
21 is formed, so that the connection with the base station 42 is established.
The wireless channel for communication linking between them is determined (FIG. 4).

Meanwhile, the base station 42 in response to an outgoing call from the mobile station 41 ₁ captures the channel for the call (Fig. 5) in accordance with a predetermined call processing procedures, the identification information of the diffusion pattern corresponding to the channel P ₂ and transmits an incoming call signal indicating the identification number of the incoming call destination mobile station (FIG. 4). Mobile station 41
In _2, the control unit 21, in the same manner as the control unit 21 of the mobile station 41 ₁ accesses the control radio channel receives the incoming call signal described above, incoming call to the own station by analyzing the content of the signal Upon recognizing the call, the base station 42 transmits a call response signal (FIG. 4), and a command to generate a spreading code corresponding to the identification information P ₂ included in the incoming call signal to the diffusion pattern generation unit 37 ₁ I do.

In this way, the mobile station 41 ₂ establishes a communication radio channel connecting to the base station 42 (FIG. 4).
), A communication path is formed between the mobile station 41 ₁ and the base station 42. In the mobile stations 41 ₁ and 41 ₂ , the control unit 21
Performs intermittent control of the output of the power amplifier 26 ₁ at a predetermined timing, thereby performing time division duplex (T) transmission alternately with the base station 42 on the above-described communication radio channel.
A call is performed by the DD) method.

[0022] The base station 42 during a call, to recognize according to the reception electric field level of the call for a radio channel that the mobile station 41 ₁ is moved to a point to the closest distance to the own station, the channel transmitting a power control command requesting to reduce the transmission power to the mobile station 41 ₁ via. When the control unit 21 receives and recognizes such a command through the first data input, the mobile station 41 ₁ instructs the power amplifier 26 ₁ to reduce the output power. Since the power of the transmission wave this way is fed from the power amplifier 26 ₁ to the antenna 29 side is reduced, due to the received wave of a large level is reached in accordance with the movement of the base station 42 the mobile station 41 _1, This avoids the sensitivity suppression that occurs.

Further, as described above, the control unit 21 of the mobile station that starts a voice call generates a spreading pattern corresponding to a control wireless channel based on the configuration of the wireless zone stored in the memory in advance. It instructs the diffusion pattern generation unit 37 ₂ that accesses the control radio channels controlled by the base station 42 via the other data output and the other data input as described above.

Accessing such a control radio channel
If you want to use₁Is granted
Substituting the same reference number for each component
hand" _Two'' Perform the same operation, and
Each component indicated by a reference number with no
Here, the basic operation of each part
Description of the work is omitted.

The control unit 21 performs a predetermined control operation in response to a call that occurs in its own station during a call while facing the base station 42 by accessing the control radio channel in this way. When there is a facsimile incoming call to the mobile station 41 ₁ from the communication network, the base station 4
2 is an empty radio channel for call according to the call (FIG. 5)
Captures and transmits an incoming call signal indicating the identification number of the identification information P ₃ and the incoming call destination mobile station of the diffusion pattern corresponding to the channel (FIG. 4). The control unit 21 of the mobile station 41 ₁
When an incoming call to the own station is recognized by analyzing the identification number included in such an incoming call signal, an incoming call response signal is transmitted to the base station 42 (FIG. 4), and the identification information included in the incoming call signal is transmitted. since command to generate a spreading code corresponding to P ₃ to the diffusion pattern generation unit 37 _2, the mobile station 41
_A communication path is formed between ₁ and the public communication network via the base station 42 (FIG. 4).

[0026] In a state where the communication path is set in parallel with respect to incoming facsimile call this way during a call by voice control unit 21 transfers the signal given from the facsimile terminal to the modulator 23 _2, the opposite providing a digital signal output from the detection unit 35 ₂ to the facsimile terminal. Further, the control unit 21, also in the second allocated call radio channel to a call in the same manner as in the first call for a radio channel assigned to the call, division duplex when intermittently the output of the power amplifier 26 ₂ realizing the call by Shin (TDD) scheme, and variably controls at interlocking the output level of the power amplifier 26 _1, 26 ₂ in response to the power control command received from the base station 42.

As described above, according to the present embodiment, a modulator for performing primary modulation, a multiplier for performing spreading processing, a spreading pattern generator, a frequency converter, a power amplifier, for a mobile station apparatus dedicated to voice communication. An oscillator that adds a small-scale circuit such as a multiplier that performs despreading processing and a detector that restores a primary modulated wave signal, and that determines an antenna system, a radio channel transmission / reception system, a synchronization control system, and a transmission frequency. By sharing a circuit requiring a large circuit space or a large mounting space as described above, it is possible to form a communication path in parallel for a plurality of calls at the same time.

That is, for example, voice communication and data communication using a facsimile terminal and other data terminals are performed in parallel while satisfying the weight reduction and size reduction requirements originally required of the mobile station device. Or data communication using multiple data terminals can be performed in parallel,
The probability that an incomplete call will occur because the called mobile station is busy is reduced, and the mobile station can use a facsimile terminal or the like to terminate the call without interrupting the call as in the conventional example. Data transmission to the destination can be performed.

In this embodiment, a case where a facsimile call is generated during a call is shown. However, the present invention is not limited to such a call. For example, an outgoing call related to a personal computer or other data terminal or Even when an incoming call occurs, the present invention can be applied in a similar manner as long as the control unit 21 can perform call processing related to the call in parallel.

Further, in this embodiment, a radio channel for communication is allocated to a mobile station according to a spreading pattern designated by a base station in accordance with a predetermined communication control procedure. It is not limited to the method, for example, the mobile station is assigned a plurality of spreading patterns in advance, and by appropriately selecting a vacant one of these spreading patterns, the mobile station can use a wireless channel corresponding to the selected spreading pattern. The same applies to access.

Further, in this embodiment, the modulators 23 ₁ , 2
3 ₂ does not define anything about scheme modulation process performed, but the present invention adds a small circuit as described above, and share the circuitry which requires large-scale circuit or large mounting space that Any method can be used as long as a call state can be realized for a plurality of calls in parallel. Further, as for the spread spectrum method, if the original requirement for the mobile station apparatus is satisfied in the same manner, for example, a direct spread method, a frequency hopping method, a time hopping method and a hybrid method based on a combination thereof can be applied. is there.

As described above, in the present invention, a specific communication
It is possible to set the number of communication paths according to the communication volume for the other party
Become. Furthermore, a means for occupying a large circuit area or a large mounting area, such as a transmitting means , is shared , and a small-sized and small mounting area spreading code generating section and a spreading processing section.
By There Rukoto is added, the number of communication paths adapted to the traffic
But Ru is formed in parallel.

That is, since a plurality of communication paths can be formed in parallel while satisfying the demand for miniaturization and weight reduction of the mobile station apparatus, data transmission using a data terminal during a voice call or a plurality of communication paths can be performed. Data transmission can be performed in parallel using the data terminal, and the service quality of the mobile communication system can be improved.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a diagram showing one embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration example of a mobile communication system to which the embodiment is applied.

FIG. 4 is a diagram illustrating the operation of the present embodiment.

FIG. 5 is a diagram illustrating the assignment of a diffusion pattern.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Antenna sharing means 12 Modulation means 13 Code generation means 14 Spreading processing means 15 Synchronization means 16 Despreading processing means 17 Demodulation means 21 Control unit 22 Audio codec (CODEC) 23 Modulator (MOD) 24, 34 Multiplier 25 Frequency converter Reference Signs List 26 Power amplifier 27 Hybrid (H) 28 Antenna duplexer (DUP) 29 Antenna 30, 31 Oscillator 32 Receiving unit 33 Synchronizing unit 35 Detecting unit 36 Synchronizing control unit 37 Spreading pattern generating unit 41 Mobile station 42 Base station

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (2)

(57) [Claims] 1. A communication signal spread between a communication partner.
In a spread-spectrum communication apparatus that performs communication based on a single communication, the spread band of a communication signal for one communication partner is a single communication band.
More than the occupied bandwidth of the trusted radio channel,
And a plurality of spreading codes generated by the spreading code generating unit.
Multiple communication by spreading the communication signal to the same communication partner
A spread processing unit for forming a wireless communication channel; and the one communication phase through the plurality of communication wireless channels.
A spread-spectrum communication device , comprising: transmission means for transmitting the communication signal in a hand . 2. A communication signal spread between a communication partner.
Communication in spread spectrum communication equipment that performs communication by
In the method, the spread band of the communication signal for one communication partner is a single communication.
More than the occupied bandwidth of the trusted radio channel,
And a communication code for the one communication partner is generated by the plurality of spreading codes.
A communication signal is spread to generate a plurality of communication radio channels, and the one communication phase is transmitted via the plurality of communication radio channels.
A spectrum characterized by transmitting the communication signal to a hand .
A communication method in a ram spread communication device.