JP2002152083A - Ss communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an SS communication apparatus encoding and decoding an information signal by a CDMA system and transmitting and receiving it with an ID code signal by spectrum diffusion communication. SOLUTION: The apparatus is provided with an SS transmission part having CPU 19 and a memory circuit 20, which are third control means controlling a pseudo noise signal used for modulation by the spectrum diffusion of the information signal and the generation of the prescribed ID code signal and controlling the transmission frequency bands of the information signal and the ID code signal and an SS reception part having CPU 57 and a memory circuit 58, which are second control means controlling an SS reference signal inputted to a surface acoustic wave convolver 61, and a control circuit 64 inputting the received ID code signal and the SS reference signal by the second control means to the surface acoustic wave convolver 61 and inversely diffuse them and controls a system whether the information signal is to be demodulated or not according to whether the demodulated ID code signal is the prescribed ID code signal or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code D)
The present invention relates to an SS communication apparatus that transmits and receives information by spread spectrum (SS) communication using an ivision Multiple Access (code division multiple access) method.

[0002]

2. Description of the Related Art A spread spectrum (SS) communication system has been attracting attention as one of the modulation methods for a wireless LAN with the recent development of the wireless communication technology. Spread-spectrum communication is a method of spreading the signal energy in a much wider frequency bandwidth than the original frequency bandwidth of the signal to be transmitted and transmitting it. Is known as a communication system having In the SS communication system, an information modulation signal is spread in terms of frequency (spectrum) using a code having orthogonality, and a direct spreading system (SS-DS system) is used to change the frequency with time (hopping) and transmit. The frequency hopping method (SS-FH method) can be roughly classified.

A spread code (PN code: pseudo-noise code) for SS communication has a role as an identification code for many users in addition to a function to expand a frequency bandwidth, and can realize a CDMA system. Become. In the conventional analog modulation schemes such as AM and FM, transmission / reception by multiple access is realized by the FDMA scheme in which a given frequency bandwidth is divided at fixed frequency intervals and assigned to a large number of channels.

[0004] The FDMA system is suitable for analog lines and is used for analog mobile phones and the like. On the other hand, the CDMA system has a feature that, unlike the FDMA system in which the frequency bandwidth of an information signal is determined, the frequency of the information signal is spread and widened, so that various information can be mixed and transmitted. Used in digital mobile phones and the like.

At present, studies on advanced low power data communication systems that respond to the needs of advanced wireless systems and multimedia communications have begun. This advanced low-power data communication system further enhances the current wireless LAN and low-power data communication system (medium-speed wireless LAN) for transmitting moving images, and achieves higher speed, higher capacity, higher density, diversification, etc. It is being studied to respond to the problem. The main specifications of the advanced low power data communication system at present are as follows. The radio frequency of the 2.4 [GHz] band (ISM (for industrial science and medical) band) is 2400 to 24.
83.5 [MHz] band (current system is 2471-24
79 [MHz] band), the number of channels is not specified (current system is 1 channel), 26 [MHz] band is 3 channels +
In the remaining 5.5 [MHz], the arrangement can be set for one channel or the like, and the antenna power is 10 [mW / MHz] or less (similar to the current system).

[0006]

SUMMARY OF THE INVENTION An SS including a communication modem corresponding to an increase in data transmission speed by SS wireless communication
At present, the communication device is adapted to shorten the code synchronization acquisition time by using a short range of the PN code (PN code), and as a result, to increase the data transmission speed.

[0007] Therefore, the problem is that the CDMA code based on the original SS radio communication is used because the PN code is in the short range.
Most of the SS communication apparatuses adopt the FDMA scheme, which cannot use the scheme and has low channel efficiency. In this FDMA system, the effective channel utilization rate per unit frequency is poor.

Further, in a radio apparatus for transmitting and receiving information signals, in order to secure the security of the information signals and to improve the convenience of users, a signal (ID code signal) which has been converted into an ID together with the information signal is included. The need to transmit information
There is also a high demand for advanced information communication by wireless devices (for example, transmission and reception of moving image information).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables power saving and high-speed code synchronization correlation, and encodes and decodes information signals such as images (including moving images) by a CDMA system. It is an object of the present invention to provide an SS communication apparatus that transmits and receives an ID code signal and spread spectrum communication.

[0010]

The present inventors have conducted trial and error studies to solve the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by the following means, and have completed the present invention. That is, the SS communication apparatus of the present invention encodes an information signal, modulates the encoded information signal and a predetermined ID code signal by spread spectrum transmission, and modulates the information signal by spread spectrum. A transmission unit comprising: a pseudo noise signal used for generating the predetermined ID code signal; and a third control unit configured to control a transmission frequency band of the information signal and the predetermined ID code signal. And

In the present invention, the third control means includes at least a central processing unit and a memory,
It is preferable that at least one of the frequency setting data, the call name of the transmitting unit, and the spread spectrum control data is stored in the memory.

According to another aspect of the present invention, there is provided an SS communication apparatus comprising: a surface acoustic wave convolver; a second control unit for controlling a predetermined SS reference signal input to the surface acoustic wave convolver; The ID code signal is obtained from the received information signal and ID code signal, and the ID code signal and the predetermined SS reference signal by the second control means are input to the surface acoustic wave convolver to perform despreading. And a first control unit for controlling whether to demodulate the information signal based on whether or not the decoded ID code signal is a predetermined ID code signal.

[0013] The receiving section may have means for demodulating the received information signal by despreading, decoding the encoded information signal from the demodulated signal, and outputting the decoded information signal.

Further, the second control means further controls the frequency oscillated from the oscillator in the front end circuit and / or the storage of the information signal in the memory and the shaping of the information signal, It is preferable that at least a central processing unit and a memory are provided, and the memory stores at least one of frequency setting data, a call name, and spread spectrum control data.

The surface acoustic wave convolver in the SS communication apparatus according to the present invention comprises: first and second surface acoustic wave transducers for exciting first and second surface acoustic waves, respectively; And a plurality of output electrodes disposed between the second surface acoustic wave converter and the first and second surface acoustic wave converters. It has a multi-track structure composed of a set, and each of the output electrodes is divided into a plurality of output electrode pieces.

In the present invention, it is preferable that the number of the output electrode pieces of the surface acoustic wave convolver is the same in all the sets, and the lengths of the output electrode pieces are all equal. Further, the surface acoustic wave convolver may include a unit for combining a part or all of the plurality of output electrode pieces for each of the sets.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The current 2.4 GHz band SS
The Radio Law regarding the DS system by communication is based on one channel (C
H: communication path) bandwidth (BW) = maximum 26 [MH]
z], and can be used up to 4CH. Therefore, in a preferred embodiment of the present invention, the information rate is packetized for 1 to 3 CH, that is, 6 [Mbp].
s] is 6 [Mbps] / 3CH = 2 [Mbp]
s] / 1CH. The remaining 1CH is only ID code signal (PN code in long range) information which is a confidential signal, and all 1 to 4CHs from the SS transmitter are FDM (time division multiplexed information in packet data format) in the same bandwidth. FDM) -SS transmission using a signal and an ID code signal. Note that BPS is used for information modulation or SS modulation.
The transmission rate can be doubled by adopting the K (two-phase shift keying) or QPSK (four-phase shift keying) system.

In the SS receiver, first, the channel of only the ID code signal is preferentially despread, and demodulated by a surface acoustic wave convolver having a short code synchronization acquisition time (high-speed synchronization correlation is possible). After that, images (including moving images)
Demodulation (BPSK or QPSK demodulation, decoding) of the SS information signal (information rate). As a result, it is possible to provide an SS communication apparatus using the CDMA scheme with high channel efficiency.

In particular, in the SS communication apparatus of the present embodiment, by using a surface acoustic wave convolver for demodulating an SS-modulated ID code signal, a wide band and PN code length, which are difficult for an IC (digital matched filtering circuit, etc.). Power-saving and high-speed synchronous correlation can be achieved for long signals, and is effective for demodulation such as high-speed PN chip rate and PN long range.

[0020]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. [Embodiment of SS Communication Apparatus] FIG. 1 is a circuit block diagram showing an outline of an SS communication apparatus according to an embodiment of the present invention. First, S which is a transmission unit of the SS communication apparatus in FIG.
The main components of the S transmitter will be described first. Reference numeral 11 denotes a data input unit. When the input data is an analog signal, the data is input to the data input unit 11 as a digital signal by an A / D converter (not shown) (including an A / D converter (not shown)). A / D conversion can be configured as an input interface unit that dynamically responds to the signal form). Reference numeral 12 denotes an S / P converter for converting serial data into parallel data. Reference numeral 13 denotes a communication path encoding circuit (for example, an error correction circuit or the like, which is not shown in the drawing) for encoding each channel (communication path). Is a diffusion circuit (mixer circuit having a DBM, etc.) for spreading the energy of the information modulation signal
It is. Reference numeral 15 denotes a PLL frequency synthesizer LS
I and 16 denote a VCO (Voltage Controlled Oscillator), 17 denotes an LPF, and each channel (1 to 4C in FIG. 1).
A circuit for oscillating the predetermined frequency band of H) is formed. 1
Reference numeral 8 denotes a PN oscillator, which is a PN code oscillator for performing SS modulation. 19 denotes a CPU (Central Processing Unit), 20 denotes a memory circuit, and a circuit for oscillating the above-mentioned predetermined frequency band and / or the PN oscillator 1
And the like for controlling the circuit 8 (third control means). Reference numeral 21 denotes a broadband high-frequency amplifier, reference numeral 22 denotes a BPF (bandpass filter), and reference numeral 23 denotes a Tx · ANT (transmission antenna).

The operation of the SS transmitter shown in FIG. 1 will be described. Image data and the like input from the data input section 11 as digital data are converted by the S / P converter 12 into one.
One serial data is converted into three parallel data (in FIG. 1, a maximum of three parallel data is converted according to the capacity of digital data input to the S / P converter 12). Is done. The channel encoding circuit 13 encodes the input parallel data according to the channel (channel) (adds an error correction code), and inputs the encoded parallel data to the spreading circuit 14. The spreading circuit 14 performs SS modulation (spread spectrum) on the input encoded parallel data (information signal) and a predetermined ID code signal to be generated by the PN oscillator 18 (in FIG. The information signal is subjected to SS modulation and the ID code signal of 4CH is converted to SS.
Modulated). The spreading circuit 14 includes a PLL frequency synthesizer LSI 15, a VCO 16, and an LPF 17.
Thus, the information signals of 1 to 3CH are time-divided (time division of packet data) in a predetermined frequency band, and FDM (frequency division multiplexing) is performed together with a predetermined ID code signal of 4CH. In this embodiment, the information signal and the ID code signal are modulated by BPSK modulation or QPSK modulation (the information signal is implemented by a PN short range code, and the ID code signal is implemented by a PN long range code). The SS modulation of the information signal and / or the ID code signal is controlled by the CPU 19 and the memory circuit 20 for frequency division and time division.

PLL frequency synthesizer LSI 15, V
Control of the CO 16 and the LPF 17 and / or the PN oscillator 18 by the CPU 19 and the memory circuit 20 will be described. The memory circuit 20 mainly stores frequency setting data, call name of the SS transmitter side, feedback tap information, and control data of orthogonal codes (Gold sequence) for the PN code.
At the time of SS modulation of the D code signal, the CPU 19 extracts the control data from the memory circuit 20 and extracts the control data from the PN oscillator 18.
Is controlled in accordance with the information signal and the ID code signal. The feedback tap information is information such as a combination of the positions of the feedback taps of the shift register that generates the above-described orthogonal code, and is suitably stored according to the number of CHs of the information to be transmitted. Further, at the time of time-division of the information signal and at the time of FDM of the information signal and / or the ID code signal, the frequency setting data is extracted from the memory circuit 20 and the frequency setting data is read out.
The L-frequency synthesizer LSI 15 is controlled to match a predetermined frequency band. Note that the call name stored in the memory circuit 20 is added to each packet data output from the spreading circuit 14,
The CPU 19 pulls out the memory circuit 20 and adds it to the information signal and / or the ID code signal.

After the SS modulation by the spreading circuit 14 and the like, in FIG. 1, the information signals (f1, f2, f3) of channels 1 to 4 are time-division multiplexed (TDM) with packet data, and a predetermined ID code signal (TDM). In f4), transmission power is obtained by the wideband high-frequency amplifier 21 in a form of frequency division multiplexing (FDM) together with the information signal, band-limited by the BPF 22, and transmitted as transmission information from the Tx / ANT 23 by SS radio. . In the present embodiment, the radio frequency band of the advanced low power data communication system is 24.
It can be transmitted from the Tx / ANT 23 as transmission information using the 00 to 2483.5 [MHz] band (CHs 1 to 3 are information signals such as images, and CH 4 is an ID code signal).

Next, main components of the SS receiver, which is the receiving unit of the SS communication apparatus in FIG. 1, will be described.
51 is Rx ANT (receiving antenna), 52 is BPF
(Bandpass filter), 53 indicates an LNA (low noise amplifier), and 49 indicates a DBM (double balanced modulator). 54 is a PLL frequency synthesizer LSI, 55 is V
CO, 56 denotes an LPF, 57 denotes a CPU, 58 denotes a memory circuit, and constitutes a front-end circuit or the like for performing pre-processing (creating an intermediate frequency) of a received signal including the DBM 49. The CPU 57 and the memory circuit 58
Are the surface acoustic wave (SAW) convolver SS
A circuit for controlling a reference signal is also configured (second control means). 50 is a BPF, 59 is an IF-AMP which is an intermediate frequency amplifier, and 60 is an SS information signal and an SSID.
This is a separator for separating a code signal. 47 is BP
F and 61 are SAW convolvers, 62 is a PN code oscillator input to the SAW convolver 61 as a predetermined SS reference signal, 46 is a carrier OSC of the SS reference signal, and 48 is a DB.
M is shown. PN oscillator 62, carrier OSC4
6. An SS reference circuit, which is a circuit for generating a signal to be input to the SAW convolver 61 as an SS reference signal, is configured by the DBM 48 and the like. 63 is an A / D converter, 64
Is a control circuit. 65 is a despreading circuit for demodulating the SS modulated signal, 66 is a communication path decoding circuit, and 67 is a P / D
It is an S converter. Here, SAW convolver 61, A /
The D converter 63, the control circuit 64, the separator 60, etc.
Is configured. 68 is a data output unit,
When the output data is an analog signal, D /
Output from the data output unit 68 as an analog signal by the A converter (including a D / A converter (not shown), it is also possible to configure the A / D conversion as an output interface unit dynamically corresponding to the signal form to be output). .

The operation of the SS receiver in FIG. 1 will be described. The transmission information (for example, information signal and information of ID code signal using 1 to 4CH) is Rx • ANT51.
And processed by a BPF 52 and an LNA (low noise amplifier) 53, and then input to a DBM 49. DB
In M49, the frequency synthesizer LSI54, VCO5
5 and LPF 56 by CPU 57 and memory circuit 58
To produce an intermediate frequency for the received signal. The memory circuit 58 includes the frequency setting data, call name, feedback tap information, orthogonal code (gold sequence) control data for the PN code, and SS reference signal control data for controlling an SS reference signal circuit of the SAW convolver 61 described later. Is stored, and the CPU 57 controls the intermediate frequency by using the frequency setting data, the call name, the feedback tap information, and the control data of the orthogonal code (Gold sequence) for the PN code. Then, from DBM49 to BPF50 and IF-AMP
(Intermediate frequency amplifier) 59 receives the received signal.

The signal input to the IF-AMP 59 is amplified to an intermediate frequency, and the channels 1 to 4 in the present embodiment are supplied to the separator 60, and the 4CH (ID code signal) in the present embodiment is passed through the BPF 47 to the SAW convolver. 61, respectively. In the SAW convolver 61, high-speed code synchronization correlation is performed by the input ID code signal and the SS reference signals from the PN oscillator 62, the carrier OSC 46, and the DBM 48, which are SS reference circuits controlled by the CPU 57 and the memory circuit 58 described above. After the SS demodulation (despreading) is performed, the signal is output to the A / D converter 63. SS reference circuit and CPU 57, memory circuit 5
8 will be described. The CPU 57 uses the PN to generate a predetermined SS reference ID code signal based on the SS reference signal control data stored in the memory circuit 58.
The oscillator 62 is controlled. In order to determine and control whether or not the received ID code signal is a predetermined ID code signal, a high-speed code synchronization correlation with a predetermined SS reference ID code signal is performed by a SAW convolver 61 (the SS communication method is SS- Either of the DS / SS-FH method can be adopted, but SS demodulation by the SAW convolver 61 is best performed by the SS-DS method. The output signal from the SAW convolver 61 converted to a digital signal by the A / D converter 63 is input to the control circuit 64. Control circuit 64
Is ON / OF for the information signals of 1 to 3 CH in the present embodiment to the separator 60 by the output signal from the SAW convolver 61 which differs depending on the predetermined ID code signal.
F (connection / disconnection) control is performed. The control circuit 64 separates the output signals from the SAW convolver 61 that differ depending on the predetermined ID code signal, for example, when the received ID code signal is correlated once as the predetermined ID code signal on the SS receiver side. Various controls are possible, such as keeping the device 60 ON for a predetermined time or turning ON the separator 60 only during the time when the correlation is taken as a predetermined ID code signal on the SS receiver side. The separator 60 includes a control circuit 64
When the ON control is performed, the information signal is passed to the despreading circuit 65. When the control circuit 64 performs the OFF control, the information signal is cut off.

The despreading circuit 65 performs SS demodulation (despreading) on the SS information signal. In this embodiment, SS
Since the SS-modulated SS information signal from the transmitter is an SS-modulated signal (TDM signal) using a PN short range code, SS demodulation (BPSK or QPSK demodulation can be performed) by, for example, a digital matched filtering circuit using an IC. . Further, it outputs the TDM signal, which is serial data, to the communication path decoding circuit 66 as parallel data of 1 to 3 CH. The channel decoding circuit 66 decodes the encoded data (performs error correction decoding) and outputs the data to the P / S converter 67. P /
In the S converter 67, the data time-divided by the memory circuit 58 or the like is temporarily stored, the data is shaped by the CPU 57 or the like, and the data is output from the data output unit 68.

By using the SS transmitter and the SS receiver in the present embodiment, a large amount of data such as a moving image
Since transmission and reception including the ID code signal can be performed by the S-CDMA method (the transmission method is the SS-CDMA method by FDM of the information signal and the ID code signal), the signal received at the receiving side can be easily controlled. Done. Further, in the above-described embodiment, transmission and reception of large-capacity data has been described; (2.4 GHz band ISM band 2400) conforming to the wireless communication standard (IEEE802.11b) by using a receiver and an SS receiver
2483.5 [MHz] or 2471-2497 [M
Hz]).

Further, in this embodiment, as transmission / reception of a large amount of data such as an image (including a moving image), the SS transmitter and the SS receiver use an advanced low power data communication system (can be used indoors and outdoors, etc.). Was described as an example. According to the present embodiment, the data demodulated by the SS
It is also possible to perform data exchange by connecting to Bluetooth, and it is also possible to transmit data demodulated by an SS receiver to a remote location using a telephone ISDN line.

The present invention is not limited to the above embodiment. That is, the SS transmitter and the SS receiver in the above-described embodiment are integrally constructed, and full- or half-duplex communication of the information signal and the ID code signal by the transmission-side SS transceiver and the reception-side SS transceiver becomes possible. . First, the ID code signal is mutually verified by one or more SS transceivers on the transmitting side and one or more SS transceivers on the receiving side. After the ID code is decrypted,
Data transmission and reception are performed by one or more SS transceivers on the transmission side and the reception side, respectively. Further, if an error occurs during communication, the transmitting side and the receiving side communicate with each other (communicate with each other by an ID code signal or the like), and retransmission of communication data becomes possible. For this reason, SS transceiver (integrated type)
The reliability of data exchange can be improved.

[Embodiment of surface acoustic wave convolver]
As an example of the above-described surface acoustic wave (SAW) convolver, FIG. 2 shows a schematic diagram of a main part of a SAW convolver device having a multi-track structure.

In FIG. 1, reference numeral 111 denotes a first surface acoustic wave converter to which a received signal is inputted, and 112, a second surface acoustic wave converter to which a reference signal is inputted. The first surface acoustic wave converter 111 includes a first interdigital transducer (IDT) having a positive electrode 113 and a negative electrode 117, and a positive electrode 1
14 and a third interdigital electrode having a negative electrode 117. That is, it has a parallel structure of the first and third interdigital electrodes. The second surface acoustic wave converter 112 also corresponds to the first surface acoustic wave converter 111 and has a positive electrode 115 and a negative electrode 118 (second interdigital electrode) and a positive electrode 116 and a negative electrode 118 ( (Fourth interdigital transducer).

Reference numeral 121 denotes an output electrode (delay line) corresponding to the first and second interdigital electrodes, and is constituted by a plurality of output electrode pieces 121a, 121b and 121c. The first and second interdigital electrodes and the output electrode 121 form a first track. Reference numeral 122 denotes an output electrode (delay line) corresponding to the third IDT and the fourth IDT, and a plurality of output electrode pieces 122a and 122a.
2b and 122c. The third and fourth interdigital electrodes and the output electrode 122 form a second track. That is, the SAW convolver of FIG. 2 has a multi-track structure including the first and second tracks.

Reference numeral 123 denotes a cascade connection circuit which cascade-connects the output electrode pieces to combine a plurality of output electrode pieces of the output electrode 121 of the first track, and has output terminals outA and outB and an external SW 137. The cascade connection circuit 123 forms an output electrode of the first track by combining suitable lengths of the output electrode pieces,
Extract the convolution output signal from each output terminal. Reference numeral 124 denotes a cascade connection circuit for cascade-connecting the output electrode pieces in order to combine a plurality of output electrode pieces of the output electrode 124 of the second track, and an output terminal out.
A ′, outB ′ and an external SW 137 are provided.
The cascade connection circuit 123 forms an output electrode of the first track by combining suitable lengths of the output electrode pieces, and extracts a convolution output signal from each output terminal.

In FIG. 2, the cascade connection circuit 123
Connects the output electrode piece 121a and the output electrode piece 121c,
The cascade connection circuit 124 connects the output electrode piece 122a and the output electrode piece 122c. The first track side outputs the delay line length 2L from the output terminal outB, and the second track side outputs the delay line length 2L from the output terminal outA '. select. Also,
The external SW control circuit 125 simultaneously turns ON / OFF the output electrodes 121 and 122 of the first track and the second track.
It is means for turning off. Reference numerals 119 and 140 denote first surface acoustic wave converters 111 (first and third interdigital transducers 11).
3, 114, 117 in parallel), the second surface acoustic wave converter 112 (second and fourth interdigital electrodes 115, 1).
16 and 118) and the shield electrodes between the output electrodes 121 and 122.

Reference numerals 131 and 135 denote bandpass filters (B
PF), 132 is a PN oscillator (pseudo noise OSC), 13
Reference numeral 3 denotes a PLL frequency synthesizer, and reference numerals 134 and 136 denote double balanced modulators (DBMs), each of which constitutes an external circuit. The external circuit is a circuit for generating the SS reference signal (in FIG. 1, the above-described reference circuit is applied to this external circuit).

The first surface acoustic wave converter 111 has two terminals for inputting a reception signal (IN1 and IN1 in the figure).
3) Have (parallel structure). Each terminal is disposed on the positive electrode side 113 and 114 of the IDT, respectively.
17 is common. This first surface acoustic wave converter 111
, The second surface acoustic wave converter 112 has two reference signal input terminals (IN2 and IN4). In the present embodiment, each of the first and second surface acoustic wave converters 111 and 112 has a unidirectional or bidirectional chirped IDT by weighting and has a parallel structure with a common negative electrode. . JP-A-7-212184 and JP-A-6-260881 can be used for these unidirectional or bidirectional broadband chirp type IDTs. In other words, the first and second surface acoustic wave converters 111 and 112 are disclosed in
ID Nos. 12184 and 6-260881
T is constructed in parallel with a common negative electrode. These chirp type IDTs are characterized by high convolution efficiency, broadband characteristics, low insertion loss, flat frequency characteristics, and low ripple.

In FIG. 2, the output electrodes 121 and 122 also correspond to the parallel structure of the first and second surface acoustic wave converters 111 and 112, and are provided on the first track side.
An output electrode 122 is arranged on the second track side, and a convolution output is extracted from the output electrodes 121 and 122 as an electric signal by correlating a received signal with a reference signal from an external circuit. Here, the output electrodes 121 and 12
In order to correspond to the data transmission speed signal to be received, the length 2 is composed of a plurality of divided output electrode pieces, and is compatible with various SS modulation / demodulation methods by the cascade connection circuits 123 and 124 and the external SW control circuit 125. By providing a multi-track configuration (combining the length of each output electrode piece to form an output electrode length) to provide a SAW convolver that becomes a wideband variable delay line correlator (including duplexing of correlators). .

The length (gate electrode) of one output electrode piece of the output electrodes 121 and 122 is L in the first track in the drawing.
The second track also becomes L (the length of one output electrode piece is different for each track, for example, the first track is L, the second track is
The tracks can be composed of 2L or the like, and all of them can be composed of different lengths). Part or all (one or more) of the output electrode pieces are connected to the cascade connection circuits 123, 124 and Combined by the external SW control circuit 125, it also supports delay detection, which is a DPSK demodulation method. For example, in the DPSK demodulation method (adopting differential detection), the method of using the output electrode is as follows.
The output electrode piece 121b having a length L at the center of the output electrode 121 of the track and the remaining two output electrode pieces 1 excluding the center of the output electrode 122 of the second track delayed by one bit of data.
Envelope detection is performed using the length 2L of 21a and 121c. At this time, the output terminals outA and outA ′
To the external DBM Lo. The signal is input to each RF port (not shown), and the phase corresponding to the data H and L is 18 from the IF port.
An envelope detection waveform of a convolution signal different by 0 ° is output. When 1 bit of low-speed data (1 cycle of PN), the first track is combined with a total of 3 L and the second track is combined with a total of 3 L, and envelope detection of a convolution signal is performed corresponding to data H and L as in the case of high-speed data. .

The reason for dividing the output electrodes 121 and 122 is to increase the output efficiency.
It is designed in consideration of an optimum division ratio that facilitates impedance matching of 1,122. Here, the output electrode 12
In FIG. 2, the number of divisions of 1,122 is the same for the first track and the second track (the number of divisions may be different for each track). Although the number of divisions is three in the first and second tracks in FIG. 2, it can be composed of two or three or more (can be composed of plural). In that case, the external SW control circuit system also differs. Basically few SW
It is preferable to configure with numbers. By cascading the division numbers, the present invention can be applied to a high-resolution distance measuring correlator or the like by the SS method using a long output electrode. Also,
As shown in FIG. 2, the gate electrode is set to the same length (ratio) for both the first track and the second track to configure the device. Dotted lines shown at the right and left ends of the output electrodes 121 and 122 for each of the left and right IDTs and each track in the drawing indicate that there are a plurality of output electrode pieces.

Further, the multi-track structure of the SAW convolver of the present embodiment can be used as a device such as the M-ary / DS-system and the parallel combination DS-system, and can be used in Wideband-CDMA (US standard communication system IS). (Established in 1995 as −665). First and second surface acoustic wave converters 11
Arrows shown below 1, 112 and the output terminal outA 'respectively indicate that the present surface acoustic wave convolver is vertically arranged to correspond to various communication systems. Further, the SAW convolver of this embodiment is an ultra-high-speed and wide-band synchronization correlator device capable of coping with a wide range because the length of the output electrode (delay line) can be changed by a cascade connection circuit of each output electrode piece.

[0042]

As described above, according to the present invention,
The following effects can be obtained. (1) Parallel transmission (packaging of information rate) by an information signal and an ID code signal is enabled, and the SS-CDMA method by FDM of an information signal (TDM signal) and an ID code signal can be realized (moving image, etc.) Large capacity data transmission). Further, by providing the third control means, it is possible to control the SS modulation of the information signal and the ID code signal and to control the transmission frequency band. Device resources can be made more efficient. (2) The memory circuit of the third control means stores frequency setting data, call name, feedback tap information, spectrum spread control data, and the like. , It is possible to perform centralized control at one location. (3) Second control means for controlling the SS reference signal input to the SAW convolver, and first control means for judging the ID code signal and controlling the information signal from the output of the SAW convolver in preference to the information signal. , Information can be received quickly and accurately. Also, ID
In order to adopt SAW convolver for demodulation of code signal,
High-speed code synchronization correlation of PN long-range code (high-speed PN
Demodulation at a chip rate or the like), it is possible to receive a highly secure signal. (4) It is possible to demodulate a received signal of the SS-CDMA system by FDM of an information signal (TDM signal) and an ID code signal (capable of demodulating a large amount of data such as a moving image). Further, since a digital matched filtering circuit using an IC can be used for the SS despreading circuit for the information signal (TDM signal), the cost of the apparatus can be reduced. (5) The second control means not only controls the SS reference signal input to the SAW convolver, but also controls the frequency of the oscillator of the front end circuit and / or the storage of the information signal in the memory and the shaping of the information signal. Further control enables the efficiency of the device resources to be improved. (6) The memory circuit of the second control means stores frequency setting data, call name, feedback tap information, spectrum spread control data, and the like. These data are effectively acquired by the CPU and the SAW convolver is stored. To control the SS reference circuit, the front end circuit, and the data output unit, centralized control can be performed at one location.

In addition to the above effects, the present invention further employs the QPSK method for modulation / demodulation of information signals or SS modulation / demodulation for high-speed data transmission, and observes a maximum bandwidth of 26 [MHz] within the framework of laws and regulations. , And the transmission speed is BP
It is possible to increase the value twice as compared with SK.

From the above effects, it is possible to provide an SS communication device that is optimal for communication using an advanced low power data communication system.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating a device outline of an SS communication device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a main part of a SAW convolver device having a multi-track structure according to an embodiment of the present invention.

[Explanation of symbols]

11: data input unit, 12: S / P converter, 13: communication channel coding circuit, 14: spreading circuit, 15, 54: PLL frequency synthesizer LSI, 16, 55: VCO, 17,
56: LPF, 18: PN oscillator, 19, 57: CP
U, 20, 58: memory circuit, 21: broadband high frequency amplifier, 22, 47, 50, 52: BPF, 23: Tx · A
NT, 46: OSC, 48, 49: DBM, 51: Rx
-ANT, 53: LNA, 59: IF-AMP, 60:
Separator, 61: SAW convolver, 62: PN oscillator,
63: A / D converter, 64: control circuit, 65: despreading circuit, 66: communication path decoding circuit, 67: P / S converter, 6
8: data output unit, 111: first surface acoustic wave converter
112: second surface acoustic wave converter, 113, 115: positive electrode of first track, 114, 116: positive electrode of second track, 117: negative electrode of first track, 118: second
Negative electrode of truck, 119, 140: shield electrode, 1
21: Output electrode (delay line) of the first track, 121a,
b, c: output electrode piece of the first track, 122: output electrode (delay line) of the second track, 122a, b, c: output electrode piece of the second track, 123: cascade connection device of the first track, 124 : Cascade connection device for second track, 125: external SW control circuit, 131, 13
5: band pass filter (BPF), 132: PN oscillator (pseudo noise OSC), 133: PLL frequency synthesizer, 134, 136: double balanced modulator (DBM), 1
37: External SW.

Claims (9)

[Claims] Means for encoding an information signal, modulating the encoded information signal and a predetermined ID code signal by spread spectrum, and transmitting the modulated information signal; and modulating the information signal by spread spectrum and the predetermined ID code. An SS communication apparatus comprising: a transmission unit that controls a pseudo-noise signal used for generating a signal, and includes a third control unit that controls a transmission frequency band of the information signal and the predetermined ID code signal. . 2. The third control means includes at least a central processing unit and a memory, and the memory includes at least one of frequency setting data, a call name of the transmission unit, and spread spectrum control data. The SS communication device according to claim 1, wherein? 3. A surface acoustic wave convolver, second control means for controlling a reference signal based on a predetermined spread spectrum input to the surface acoustic wave convolver, and converting the ID code signal from the received information signal and ID code signal. The obtained ID code signal and a reference signal obtained by the predetermined spectrum spreading by the second control means are input to the surface acoustic wave convolver to perform despreading, and the decoded ID code signal is converted to a predetermined ID code. A first method for controlling whether or not to demodulate the information signal depending on whether or not the signal is a signal.
An SS communication apparatus, comprising: a receiving unit including the control unit. 4. The receiver according to claim 1, further comprising: a demodulator for demodulating the received information signal by despreading, and decoding and outputting the encoded information signal from the demodulated signal. 3. The SS communication device according to 3. 5. The second control means further controls a frequency oscillated from an oscillator in a front-end circuit and / or a storage of the information signal in a memory and a shaping of the information signal. The SS communication device according to claim 3, wherein: 6. The second control means includes at least a central processing unit and a memory, and the memory stores at least one of frequency setting data, call name, and spread spectrum control data. The SS communication device according to any one of claims 3 to 5, wherein: 7. The surface acoustic wave convolver includes first and second surface acoustic waves that excite first and second surface acoustic waves, respectively.
A surface acoustic wave converter, and an output electrode disposed between the first surface acoustic wave converter and the second surface acoustic wave converter. The first and second surface acoustic wave converters 4. A multi-track structure comprising a plurality of sets each including one set of one track and each output electrode, wherein each of the output electrodes is divided into a plurality of output electrode pieces. An SS communication device according to item 1. 8. The S according to claim 7, wherein the number of the output electrode pieces of the surface acoustic wave convolver is the same in all the sets, and the lengths of the output electrode pieces are all equal.
S communication device. 9. The SS communication apparatus according to claim 7, wherein the surface acoustic wave convolver has means for combining a part or all of the plurality of output electrode pieces for each of the sets. .