JP3224334B2 - Transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus, for example, a code division multiple access (Code Division Multiple Access).
The present invention can be applied as a transmission device of a spread spectrum modulation system for Multiple Access.

[0002]

2. Description of the Related Art As a configuration of a transmitting apparatus that takes in a plurality of data, multiplexes the data, spreads the spectrum, and transmits the modulated data,
A configuration as shown in FIG. 2 can be given as an example.

[0003] In FIG. 2, a plurality of different data sequences [alpha] 1 [1] having an input data rate of the variable rate (t
[1]) ~α1 [3] ( the t [3]), the symbol repetition circuit 21 to 23, the transmission rate of their respective data transmission speed corresponding to the baseband signal having a frequency band of a certain And multiplexed by the multiplexing circuit 24 to obtain the data series j.
Generate Next, in Shin station spreading code generating section 25 feed, each
Generating a spreading code assigned to the transmitting station performs multiplication of the generator output j in a multiplier 26, by generating a base band signal, an input transmission data series of a plurality of variable data rate, multiplexes Transmission is performed as time-series transmission data.

[0004]

However, in the above configuration, a plurality of transmission data sequences of variable data rates are converted into a constant transmission rate corresponding to a baseband signal having a constant frequency band. by multiplexing to generate a data series j, and spreading code <br/> de assigned to each transmission station performs multiplication of the generator output j, by generating a base band signal, a number of data transmission rate Since the transmission data is generated by multiplexing a plurality of different data sequences having the following symbol symbols, symbol repetition circuits 21 to 21 convert the transmission rate to a constant rate by the number of transmission data to be multiplexed.
In order to convert the transmission rate to a constant rate, the larger the difference between the input and output data transmission rates with respect to the transmission station apparatus, the larger the transmission station spreading code corresponding to the transmission input data and the above transmission rate. Since the number of times of multiplication with the output signal of the circuit for converting into a constant speed increases, there is a problem that extra computation occurs.

[0005] From the above, one transmitting station has
Takes the input data having a plurality of variable transmission rates, and spread with a wide spreading code frequency bands from those of the transmission data, the spread spectrum modulation transmission of transmitting it as a transmission signal of a base band signal having a predetermined frequency band in the device, a small circuit configuration, reduce the amount of computation than the conventional, it has been demanded be lightly computation burden.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a transmitting apparatus for transmitting a spread modulation signal obtained by performing spread modulation on a plurality of input data having different code rates, with the following characteristic configuration. It is to solve the above-mentioned problem.

That is , the input data of the above code rate is
Data editing means for arranging the input data by the number determined from the code rate relationship and summing up the time-series data, transmitting-station identification information multiplying means for multiplying the obtained time-series data with transmission station identification information, It comprises a code rate conversion means for converting the time series data obtained by the product into predetermined code rate data, and a spread modulation means for performing spread modulation on the time series data obtained by the code rate conversion.

[0008]

According to the configuration of the present invention, for a plurality of input data different code rate, the data for each symbol rate, since summarized in the time-series data arranged by the number, determined from the code rate relationship of the input data In addition, conversion of the code rate for each input data as in the related art is not performed. Therefore, the data is collected into time-series data at a lower speed stage than in the related art. In addition, the circuits are rearranged and collected, so that the circuit configuration is simple.

Further , since the obtained time-series data is multiplied by the transmitting station identification information, the transmitting station identification information can be multiplied at a low speed stage, so that a high speed operation for the processor is not required and the amount of calculation is small. Since it can be reduced, it can be easily realized without using a high-speed processing processor.

Furthermore, the time series data obtained by multiplying, into a predetermined code rate data, the spread modulation at line Uno <br/> against time series data obtained by the code rate conversion, for data in a state of being in time series data, conversion into data of a predetermined code rate is performed, it is possible to reduce the number of code rate converting means than the conventional, can the device configuration simple, compact Can be

[0011]

Next, a preferred embodiment of the present invention will be described with reference to the drawings. This embodiment, communication by code division multiple access,
Particularly Ru shall Der used for communication by the code division multiple access in a mobile communication such as a personal communication service (PCS), digital cellular. This embodiment generates a single data sequence by combining a plurality of variable transmission rate transmission input data sequences in one transmission station, and generates a baseband signal having a constant band regardless of the input data transmission speed. This realizes a transmission device capable of reducing the circuit size and the complexity of the generation procedure when transmitting data by using the transmitter.

The transmitting apparatus according to the embodiment specifically generates a single data sequence by arranging a plurality of transmission input data sequences at a variable transmission rate in a number determined by the code rate relationship of the input data. And a data compound generation unit that performs Also, Ru a transmission station identification code generator for generating code transmission station identification corresponding to transmit station. Further, a multiplication signal generation unit is provided for multiplying the transmission station identification code by the output of the data composite generation unit and generating a multiplication result signal.

[0013] A transmission rate conversion unit is provided for converting the transmission rate of the multiplication result signal from the multiplication signal generation unit to a constant transmission rate corresponding to a baseband signal having a constant frequency band. A spreading code generator for generating a spreading code assigned to each transmitting station; a spreading modulator for multiplying an output of the spreading code generator by an output of the transmission rate converter; To a minimum frequency band.

Further, the apparatus includes a carrier generation unit and a carrier product modulation unit for generating transmission data in a radio frequency band from the output of the baseband filter unit, and an antenna unit for transmitting transmission data in the radio frequency band.

[0015] With such a configuration, in one of the transmitting station
A plurality of variable transmission rate transmission input data sequences are combined to generate one data sequence, and a user code (transmission
(Station identification code) , and modulates the data transmission rate into a baseband signal having a certain frequency band.

The transmission input data in this embodiment has a variable rate and a plurality of different data sequences αk [i] (t
[I]). Here, αk [i] (t
[I]) is a time t [i] (here, t [i] = 1 to 1).
T [i]), the k-th station (here, k = 1
. I-th and ~K) (here, to i = 1 to I) is the transmit data of the (information data) + 1 or -
The data string for one frame is represented by the symbol ak.
When expressed by [i] (t [i]), it can be expressed by equation (1).
Wear. αk [i] (t) = ｛ak [i] (1), ak [i] (2), ak [i] (3),..., ak [i] (t [i]),. i] (T [i])｝ (1) The transmission data αk [i] (t [i]) having a variable rate is divided into N by 1 from a plurality of different data as in the following equation.
The transmission data of the frame, in which i is arranged in order from 1 to I, is rearranged into N sets of data sequences to generate a composite data sequence Ak (t). Where N =
{1, ..., n, ..., N}.

Ak (t) = ｛ak [1] (1), ..., ak [1] (T [1] / N), ..., ak [I] (1), ..., ak [I] (T [I] / N), ..., ak [1] (T [1] / N * (n-1) +1), ..., ak [1] (T [1] / N * n), ..., ak [ I] (T [I] / N * (n-1) +1),..., Ak [I] (T [I] / N * n),..., Ak [1] (T [1] / N * ( , Ak [1] (T [1]), ..., ak [I] (T [I] / N * (N-1) +1), ..., ak [I] (T [I])｝ (2) The transmission data Ak (t) of the one combined data series
Is multiplied with the user code bk (t), and the product
The data ck (t) is represented by the following equation.

Ck (t) = Ak (t) · bk (t) (3) Transmission data ck (t) after being multiplied with the user code
Is adapted to a baseband signal with a certain frequency band, the data transmission rate is converted,
Is converted into a data dk (τ) series, which is represented by the following equation.

Dk (τ) = ck (integer (τ / u)) (4) Here, the ratio between time τ and t is τ: t = u: 1 , and u is the ratio of data transmission rate conversion; integer () is ()
Is a function that outputs the integer value of the operation result in.

The transmission data dk after the data transmission rate has been converted (tau) is variable spread by spread signal ek (.tau. ')
The resulting modulated spread signal fk (τ ′) is represented by the following equation.

Fk (τ ′) = dk (integer (τ ′ / s)) · ek (τ ′) (5) Here, the ratio of time τ ′ to τ is τ ′: τ = s: 1 . Ah
Ri, s is the diffusion multiple of the spread signal ek (.tau. ').

The transmission data fk (τ
From ') is by the baseband filter unit, Ru extracted minimum required frequency component gk transmission (.tau.') It is. Further, the frequency-limited signal is modulated into a radio frequency (RF) band, and a modulated signal sk (τ ′) represented by the following equation:
But Ru is radiation output from the antenna. sk (τ ′) = gk (τ ′) ψ (2πωcτ ′) (6) where ψ () is a carrier and ωc is a center frequency.

With the above configuration, the means for converting the data transmission rate are integrated into one unit, and the product of the user code is multiplied by the number of data with respect to the original input data at the variable transmission rate, thereby achieving transmission. the circuit scale of the device as well as downsizing, and reducing the computation load, thereby making it possible to reduce the amount of calculation.

[First Embodiment] FIG. 1 is a functional block diagram of a transmitting apparatus for code division multiple access according to a first embodiment. In FIG. 1, a transmitting apparatus includes a data composite generating unit 101 and a transmitting station identification code multiplying unit 102.
, Transmission station code generation section 103, transmission rate conversion section 10
4, a spread modulator 105, and a spread code generator 106
, Baseband filter section 107, carrier multiplication product modulation section 108, carrier generation section 109, antenna section 110
, Control circuits 111 and 112, and an encoding circuit 113. In this transmitting apparatus, comprise a data combined generator 101, and a transmission rate conversion section 104
There is a feature .

Here, it is assumed that there is a plurality of variable-rate transmission input data in one transmission station, and the transmission input data is α1 [i] (t [i]). At this time, α1 [i] (t [i]) is the i-th (here, i = 1 to I) at time t [i] (here, t [i] = 1 to T [i]). The transmission data (information data) transmitted by the transmission input data of (1) is represented by a binary value of +1 or -1 and a data sequence for one frame is represented by a symbol a1 [i].
When represented by (t [i]), α1 [i] (t [i]) is represented by the following equation.

Α1 [i] (t [i]) = ｛a1 [i] (1), a1 [i] (2), a1 [i] (3),..., A1 [i] (t [i] ),..., A1 [i] (T [i])｝ (7) These input data are supplied from the control circuits 111 and 112 and the encoding circuit 113. These transmission input data α1 [i] (t [i]) are input to the data composite generation unit 101, respectively. Data A1 (t) obtained by combining a plurality of transmission input data is input to the transmission station identification code multiplication unit 102. At this time, the transmission data α1 having a variable rate
A plurality of different data of [i] (t [i]) is divided into N as shown in the following equation, and i of transmission data of one frame is sequentially rearranged into N sets of data sequences from 1 to I, Next formula
It can be expressed as, that generates a single data series A1 (t) complexed. Here, N = ｛1,...
n, ..., N}.

A1 (t) = ｛a1 [1] (1),..., A1 [1] (T [1] / N),..., A1 [I] (1),. [I] / N), ..., a1 [1] (T [1] / N * (n-1) +1), ..., a1 [1] (T [1] / N * n), ..., a1 [ I] (T [I] / N * (n-1) +1),..., A1 [I] (T [I] / N * n),..., A1 [1] (T [1] / N * ( N-1) +1), ..., a1 [1] (T [1]), ..., a1 [I] (T [I] / N * (N-1) +1), ..., a1 [I] (T [I])｝ (8) Such data editing of the data composite generation unit 101 can be performed sufficiently by, for example, DSP (Digital Signal Processor) processing.

[0028] In the transmission station identification code generating unit 103, encodes b1 (t) and to use an identification code of the transmitting station to the product
Occurs Te, the transmitting station identification code multiplying unit 1 the occurrence code
Give to 02. Here, the transmitting station identification code generator 103
The transmission station identification code generated in is an orthogonal code such as a Walsh Hadamard code, or a PN code, gold (Gol).
d) A spreading code composed of non-orthogonal codes such as codes, BCCH codes, and block code sequences.

The transmitting station identification code multiplying section 102 multiplies the combined transmission data A1 (t) by the code b1 (t) output from the transmitting station identification code generating section 103,
As a multiplication product code c1 (t) = A1 a (t) · b1 (t) gives the transmission speed conversion section 104.

The transmission to the speed conversion section 104 is given the output from the transmission station identification code multiplying unit 102, the transmission speed conversion section
104 is a product code from the transmitting station identification code product section 102.
Regardless transmission rate of over de, data of a constant data transmission rate d1 (τ) = c1 (integer (τ /
u)), and is provided to the spread modulator 105. here,
The ratio between tau and t, tau: t = u: is 1, u is the ratio of the data rate conversion, integer The () is a function that outputs the integer value of the operation result in the ().

The spread code generator 106 performs spread modulation on the transmission data of the transmitting station converted to a certain data transmission rate.
Then, a spreading code e1 (τ ′) to be used at the time is generated, and the generated code e1 (τ ′) is input to the spreading modulator 105. Here, the spreading code generated by the spreading code generation unit 106 is an orthogonal code such as a Walsh-Hadamard code or a PN (Pseudorandom N).
oise) code, a gold code, a VH code, and a non-orthogonal code such as a block code sequence.

The spread modulation unit 105 includes a transmission data is converted into a constant data transmission rate in the transmitting station d1 (tau),
Spreading code e1 outputted from the spreading code generating section 106
( Τ ′) to spread the transmission data d1 (τ) ,
The spread signal f1 (τ ′) = d1 (integer
(Τ ′ / s) · e1 (τ ′) is input to the baseband filter unit 107. Here, the ratio between time τ ′ and τ is τ
': Τ = s: 1. s is Ri diffusion multiples der spread signal e1 (.tau. '), integer The () is a function that outputs the integer value of the operation result in the ().

The baseband filter unit 107 extracts the spread signal f1 (.tau. ') Or <br/> al outputted from the spread modulation unit 105, a frequency component g1 (.tau.') Necessary for transmission, the carrier The signal is input to the product modulator 108. Carrier generator 10 9
Carrier ψ (2πωcτ') (where, [psi () is the carrier, .omega.c center frequency) outputs, the carrier product modulation section 1
08.

The carrier multiplying the modulation unit 108 multiplies a carrier ψ and (2πωcτ') output baseband filter 107 to be spread signal g1 has been band-limited output from the (.tau. ') From the carrier wave generating unit 109 For example, BPSK
(2-phase PSK) modulation, and generates a radio frequency (RF) band signals s1 (τ') = g1 (τ' ) · ψ (2πωcτ'), Ru is radiated output from the transmission antenna unit 110. (Specific operation): In FIG. 1, the input data α1
[1] (t [1]) is, for example, power control bit data P. The power control bit data P is data for performing transmission power control, and is, for example, about 2 kbps. The power control bit data P is provided to the data composite generation unit 101.

[0035] In addition, input data α1 [2] (t [2 ])
Is information channel data I, for example. The information channel data I is audio data, image data, and the like, for example, about 16 kbps, 32 kbps, and about 64 kbps. This information channel data I is also provided to the data composite generation unit 101.

Further, the input data α1 [I] (t
[I]) is, for example, signaling channel data (control data) S. The signaling channel data S is control data or the like, for example, 2 kbps, 4 kb
It is of the order of ps. Signaling channel data S
Is also given to the data composite generation unit 101.

[0037] Here, given as input data, and the power control bit data P for 2 kbps, and information channel data I 32 kbps, the signaling channel data S of 4kbps is the data combined generator 101
A specific operation will be described.

The plurality of input data are combined into time-series data by the data composite generation unit 101. For example, data A1 (t) = {P.S1.S2.I1 to I16} in the order of the transmitting station. It is provided to the identification code multiplying unit 102. Data A1 (t) = ｛P · S1 · S2 · I1
I16} is a signal station identification code multiplying unit 102 transmission, it is multiplied with the transmit station identification code b1 (t), multiplied code c1
(T) is obtained . The product code c1 (t) is speed-converted by , for example, twice in the transmission speed conversion unit 104, and
kbps time-series data d1 (τ) = ｛P1 · P2 · S
1−S4 · I1−I32} are obtained. Here, since the input power control bit data P is 2 kbps, the information channel data I is 32 kbps, and the signaling channel data S is 4 kbps, the total is 38 kbps.
Although the data rate becomes 6 kbps, the transmission rate conversion unit 104 can easily reduce the data rate to 64 kbps by thinning out the data by puncturing.

[0039] The time-series data d1 (tau) is spread modulated by the spread modulation unit 105, the order of the bandwidth 4MHz the spread modulation
Signal f1 (τ ′) is provided to baseband filter section 107. A frequency component g1 (τ ′) necessary for transmission is extracted from the spread modulated signal f1 (τ ′) by the baseband filter unit 107 and input to the carrier product modulation unit. The frequency component g1 (τ ′) is the carrier ψ (2πω)
cτ ′) and product-modulated to a signal s1 (τ ′) in a radio frequency (RF) band of, for example, about 1.9 GHz. The signal s1 (τ ′) is provided to the antenna unit 110 and radiated and output.

(Effects of First Embodiment): According to the first embodiment described above, a plurality of different transmission data having a variable rate input data transmission rate are combined into one data sequence, and the data transmission rate is Is converted, the size of the circuit of the transmission device for code division multiple access that generates a baseband signal having a certain bandwidth can be reduced, the processing load can be reduced, and the amount of calculation can be reduced.

That is, for a plurality of input data having different code rates, the number determined by the code rate relationship of the input data is arranged in order and combined into time-series data. Is not performed. Therefore, the data is collected into time-series data at a lower speed stage than in the related art. In addition, the circuits are rearranged and collected, so that the circuit configuration is simple.

Further , since the obtained time-series data is multiplied by the transmitting station identification information (transmitting station identification code) , the transmitting station identification information can be multiplied at a low speed stage, and a high-speed operation for the processor is required. However, since the amount of calculation can be reduced, it can be easily realized without using a high-speed processing processor.

[0043] The time-series data obtained by the multiplication product is converted into a predetermined code rate data, and performs spreading modulation on the time-series data obtained by the code speed conversion, when being in series data state By converting the above data into data of a predetermined code rate, the number of code rate conversion means can be reduced as compared with the prior art, and the apparatus configuration can be simplified and downsized.

[Second Embodiment] FIG. 3 is a functional block diagram of a transmitting apparatus for code division multiple access according to a second embodiment. In FIG. 3, the transmitting apparatus includes baseband signal generation sections 301-1 to 301-K, addition section 302, baseband filter section 303, carrier multiplication product modulation section 304, carrier generation section 305, and antenna section. 306. In this transmitting apparatus, a characteristic configuration is that a baseband signal generating section 301-
And one to three hundred and one-K, an addition unit 302 Doo.

The baseband signal generation section 301 is composed of baseband signal generation sections 301-1 to 301-K having the same configuration to correspond to the number of transmitting stations. Here, one transmitting station (for example, data terminal devices 307-1 to 307-1)
7-K), it is assumed that there are a plurality of variable-rate transmission input data, and the transmission input data αk [i]
(T [i]). At this time, αk [i] (t
[I]) is a time t [i] (here, t [i] = 1 to T
[I]) (in this case, i = 1 to I
) Is transmission data (information data) transmitted, is represented by a binary value of +1 or −1, and a data sequence for one frame is represented by a symbol ak [i] (t [i]). And αk [i] (t [i]) are expressed by the following equation.

Αk [i] (t) = ｛ak [i] (1), ak [i] (2), ak [i] (3),..., Ak [i] (t [i]),. , ak [i] (T [ i])} ... (9) k = 1 the transmission input data αk [i] (t [i ]) is given to the base <br/> band signal generating unit 301-1 , of k = K
Transmission input data αk [i] (t [i]) is input to baseband signal generation section 301-K. Here, the baseband signal generation unit 301 includes the data composite generation unit 101, the transmission station identification code multiplication unit 102, the transmission station identification code generation unit 103, the transmission rate conversion unit 104, and the spread modulation unit of the first embodiment. 105 and a spreading code generator 106.

Accordingly, the output of the baseband signal generation unit 301 generates one data sequence (for example, a 64 kbps data sequence) by combining a plurality of transmission input data sequences with variable transmission rates, code)
And modulates the signal into a baseband signal having a fixed frequency band (for example, a band of about 4 MHz), so that data with a converted data transmission rate is generated. Therefore, the output data fk (τ ′) of the baseband signal generation unit 301 is data that has been subjected to the processing of the above equations (1) to (5) , and is provided to the addition unit 302.

The adding unit 30 2 adds the output data fk (.tau. ') From the baseband signal generation unit 301-1 through 301-K corresponding to each transmitting station, synthesized baseband signal F
(Τ') = Σfk (τ') ( addition range is k = 1 to K) may grant to the baseband filter 303 to generate. This baseband filter unit 303 is, specifically, an FIR
(A non-recursive digital filter) or the like. The baseband filter unit 303 includes an adder 302
Extracts the frequency component G (τ ′) necessary for transmission from the spread signal F (τ ′) output from the
Enter 4

The carrier wave generating unit 30 5, carrier ψ (2πω
cτ ′) (where ψ () is the carrier and ωc is the center frequency) and input to the carrier multiplication product modulator 304. Carrier product modulation unit 304, the spread signal G band-limited output from the carrier baseband filter 303
And (.tau. '), By multiplying the carrier wave generating unit 30 five et output carrier wave ψ (2πωcτ'), for example, BPS
And K modulation, to generate a 1.9GHz degree radio frequency (RF) band signal S (τ') = G (τ' ) · ψ (2πωcτ'), Ru is radiated output from the transmitting antenna unit 306. (Effects of the Second Embodiment) According to the second embodiment described above, there are a plurality of transmitting stations, and when each transmitting station receives a plurality of input data of variable rates, the transmitting stations receive the data from the plurality of transmitting stations. Since input data is combined (combined) into one data series and the data transmission rate is converted to a baseband signal having a fixed bandwidth, a plurality of input data from a plurality of transmitting stations can be compared with the conventional one. In addition, the circuit can be realized with a small circuit, and the load of arithmetic processing can be reduced.

That is, for a plurality of pieces of input data having different code rates from the data terminal device 307 as data supply means, the input data of the above code rates are arranged in a number determined by the code rate relationship of the input data. Since the baseband signal generation unit 201 collects the sequence data, the code rate is not converted for each input data as in the related art. Therefore, the data is collected into time-series data at a lower speed stage than in the related art. In addition, the circuits are rearranged and collected, so that the circuit configuration is simple.

Further , since the obtained time-series data is multiplied by the transmitting station identification information, the transmitting station identification information can be multiplied at a low speed stage, so that a high-speed operation for the processor is not required and the amount of calculation is small. Since it can be reduced, it can be easily realized without using a high-speed processing processor.

[0052] multiply the time series data obtained by the product, and converted into a predetermined code rate data, a row Uno spread modulation with respect to time-series data obtained by the code rate conversion, which is the time-series data By converting the data in the state into data having a predetermined code rate, the number of code rate conversion means can be reduced as compared with the prior art, and the configuration of the spread spectrum modulation transmitter can be simplified and downsized. be able to.

Such a transmission device is effective when applied to a base station transmitting a plurality of data, and is also effective when applied to a mobile station. That is, the transmitting device of the mobile station may also transmit facsimile data and data for personal computer communication in addition to voice data, so that the above-described transmitting device is applied to such a mobile station to reduce the size. Can be achieved.

The transmitting apparatus having the above-described configuration can be applied as a transmitting apparatus of a one-to-one spread spectrum modulation communication system in addition to code division multiple access.

(Other Embodiments) (1) In the above embodiments, the signaling channel data S includes, for example, call control data, radio control data, mobile unit control data, security data, and authentication data. , And other control data.

(2) When the transmitting apparatus has a function of transmitting a synchronization signal (pilot signal), the synchronization signal is multiplied immediately after the spread modulation section 105 in FIG. It is preferable to provide it.

(3) Further, in the first embodiment, the transmission rate conversion section 104 performs thinning from a high code rate to obtain 64 bits.
In addition to setting the data to kbps, if the input data combined into time-series data does not become 64 kbps, the data can be adjusted by performing interpolation (interpolation).

(4) Furthermore, as the encoding circuit 113 of the first embodiment, a speech encoding circuit ( for example, ADPCM)
(Adaptive Differential PC
M) coding circuit, APC (Adaptive Pred)
iction Coding)-AB (Adaptive)
e Bit allocation) coding circuit, CE
LP (Code Excited Linear Pr)
edition: code excitation linear prediction) coding circuit,
LD (Low Delay) -CELP coding circuit, Q
(Qualcomm method: variable rate of 9.6 k to 1.2 kbps) CELP coding circuit, RPE (Regul
ar Pulse Excitation) -LT P
( With Long Term Predio
n) coding circuit, VSELP (Ve c tor Sum
Excited Linear Prediction
n) Encoding circuit, IMBE (Improved Mul)
ti-Band Excitation) coding circuit,
Non-linear PCM coding circuit based on μ-law or A-law),
An image encoding circuit (still image, moving image encoding circuit) or the like can be applied.

(5) Also, a data composite generation unit 101, a transmission station identification code multiplication unit 102, a transmission rate conversion unit 104,
Spreading modulator 105, baseband filter 107, 3
03 and the like can be processed by the DSP. For example, when a high-speed operation higher than the processing speed of the DSP is performed, an ASIC
(IC / LSI for specific application) and the like. Also, the carrier wave product modulation units 108 and 304
Is not limited to the one that performs BPSK modulation.
(Differential BPSK), QPSK (4-phase PSK), DQ
PSK (differential QPSK) and also performs and GMSK modulation
It may be. (6) The reliability of transmission errors can be improved by interleaving the input data before giving it to the data combining unit 101.

[0060]

As described above, according to the first aspect of the present invention, the data editing means arranges a plurality of input data by the number determined according to the code rate relationship of the input data into time-series data, and transmits the data to the transmission station identification information. Multiplying the time-series data by the transmitting station identification information by the multiplying means, converting the time-series data obtained by multiplication by the code rate converting means into predetermined code rate data, and performing code rate conversion by the spread modulation means; With the configuration in which spread modulation is performed on the obtained time-series data, it is possible to realize a transmission device that can reduce the amount of calculation and reduce the calculation load with a smaller circuit configuration than before.

According to a second aspect of the present invention, a plurality of input data of a plurality of different code rates from the data supply means is provided by a baseband signal generation means provided corresponding to each data supply means. The input data is arranged in time series data by the number determined from the code rate relationship, the transmission time identification data is multiplied with the collected time series data, and the time series data obtained by the multiplication is converted into a predetermined code. It converts to speed data, performs spread modulation on the time-series data obtained by code rate conversion, outputs a spread modulated signal, and combines the spread modulated signals obtained by each baseband signal generating means by the transmitting means. Because it was configured to transmit the signal that was made, with a very simple circuit configuration compared to the conventional,
It is possible to realize a transmission device that can edit data from many data supply units and reduce the computational load.

[Brief description of the drawings]

FIG. 1 is a functional configuration diagram of a spread spectrum modulation transmission apparatus for code division multiple access according to a first embodiment of the present invention.

FIG. 2 is a partial functional configuration diagram of a conventional spread spectrum modulation transmitting apparatus.

FIG. 3 is a functional configuration diagram of a spread spectrum modulation transmission apparatus for code division multiple access according to a second embodiment of the present invention.

[Explanation of Codes] 101: Data composite generation unit, 102: Transmission station identification code multiplication unit, 103: Transmission station code generation unit, 104: Transmission rate conversion unit, 105: Spread modulation unit, 106: Spread code generation unit, 107, 303 ... baseband filter section, 10
8, 304: carrier multiplication product modulator, 109, 305: carrier generator, 110, 306: antenna, 111, 11
2 ... control circuit, 113 ... encoding circuit, 307-1 to 30-30
7-K: Data terminal device, 301-1 to 301-K: Baseband signal generation unit, 302: Addition unit.

Continuation of the front page (72) Inventor Takuro Sato 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-7-312783 (JP, A) JP-A-7- 336767 (JP, A) JP-A-7-336323 (JP, A) Wireless Communication System Symposium, 1995. , IEEE, (1995-11), "Wideband CDMA system for personal communications", p. 195-202 (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B 1/69-1/713 H04J 13/00-13/06 H04J 3/22 H04Q 7/38

Claims (2)

(57) [Claims] 1. A transmitting apparatus for transmitting a spread modulation signal obtained by performing spread modulation on a plurality of input data having different code rates, wherein input data having the code rate is determined from a code rate relationship of the input data. Data editing means for arranging the obtained time-series data with transmission station identification information, and transmitting-station identification information multiplying means for multiplying the obtained time-series data by time-series data. A transmission apparatus comprising: a code rate conversion means for converting the time series data into predetermined code rate data; and a spread modulation means for performing spread modulation on the time-series data obtained by the code rate conversion. 2. A transmitting apparatus comprising a plurality of data supply means for supplying a plurality of data having different code rates, and transmitting a spread modulation signal obtained by performing spread modulation on data from these data supply means. For a plurality of data having different code rates from the data supply means, the input data of the code rate is arranged in a number determined by the code rate relationship of the input data and arranged into time series data. Multiplying the transmission station identification information with respect to the time series data obtained by the multiplication, convert the data into predetermined code rate data, and perform spread modulation on the time series data obtained by the code rate conversion. And a baseband signal generating means for outputting a spread modulated signal corresponding to each data supply means, and a spread modulated signal obtained by each baseband signal generating means is provided. Transmitting apparatus comprising: a transmitting means for transmitting a form signal.