JP3144411B2 - Spread spectrum communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum communication apparatus for performing code division multiplexing using orthogonal codes and receiving a transmitted spread spectrum signal.

[0002]

2. Description of the Related Art Conventionally, when transmitting data for a plurality of channels, data is generally divided and multiplexed. As a method of performing the division multiplexing, there are a frequency division multiplexing (FDM) system, a time division multiplexing (TDM) system, a code division multiplexing (CDM) system, and the like.
In the CDM system, each channel is divided by performing orthogonal transform using orthogonal codes spread in the same time-frequency space, and the data rate and weighting can be easily changed for each channel. Since it can be performed, this method is suitable for hierarchical transmission. In the field of broadcasting, graceful degradation can be performed by using a plurality of channels according to the CDM method and changing the weight between channels for transmission, and switching the number of channels to be synthesized on the receiving side according to the quality of the received signal. Practical use of a digital video signal transmission system is being studied. In the field of mobile communications, DS (Direct Sequence)
An IS-95 system standardized as a CDMA cellular telephone system using a spread spectrum system is known. In the IS-95 system, control channels and communication channels are classified according to the CDM system, and control information and audio information are inserted into a channel that has been orthogonally coded on the transmitting side and transmitted. Communication quality is improved by demodulating one channel containing information according to a communication procedure by RAKE reception using a plurality of fingers.

[0003] Here, the RAKE reception will be briefly described. The RAKE reception is a reception process peculiar to the spread spectrum communication system, and can perform the path diversity reception. In digital communications such as spread spectrum communication systems, the receiving side receives a direct wave from the transmitting side directly arriving at the receiving side and a reflected wave arriving at the receiving side after being reflected by a building or the like. become. In this case, since there are many paths of reflected waves, reflected waves of many paths (multipaths) are received. Therefore, on the receiving side, signals received via many paths are received, but these received signals are received with a propagation delay time due to the paths. As a result, on the receiving side, the received signals interfere with each other to cause a reception failure.

[0004] However, regarding a received signal that has undergone spread spectrum, the PN code used for spread spectrum cannot be correlated if it is offset in time.
Therefore, this is used to avoid a reception failure as follows. In the despreading unit, when a phase offset corresponding to the propagation delay time is given to the PN code and despreading is performed, only the received signal of the propagation delay time corresponding to the phase offset is subjected to despreading processing, and the other received signal Are not subjected to despreading processing. That is, by giving a phase offset corresponding to the propagation delay time to the PN code, it becomes possible to selectively perform despreading processing on each of the received signals without causing mutual interference. Therefore, a plurality of despreading units are provided in parallel, and in each despreading unit,
By performing despreading processing using a PN code having a phase offset corresponding to the propagation delay time of a received signal, a signal obtained by despreading a plurality of received signals received can be obtained independently.

[0005] A good demodulated signal can be obtained by giving a predetermined weight to the plurality of received signals thus obtained and adding and combining them. The method of receiving a spread spectrum signal in this way is the RAKE reception method, which is capable of selectively despreading and combining received signals from a plurality of paths, so that path diversity reception can be performed. Further, a W that shares a wide frequency band, which is promising as a third generation wireless access system,
There is a CDMA system, and it has been proposed to divide a channel by CDM to realize voice, data, and image communication.

[0006]

In the above-mentioned digital video signal transmission system and CDMA cellular telephone system, the number of channels assigned to one user is generally fixed, and the demodulator on the receiving side is
Demodulation is always performed for the number of channels allocated in advance. However, in the field of mobile communications, in addition to services mainly for voice and low-speed data transmission, services for high-speed data transmission are demanded, but conventional services such as high-speed data transmission by increasing the data rate per channel are required. In the spread spectrum communication, there is a problem that it is difficult to meet such a demand because an occupied band increases.

[0007] As a method of transmitting data by CDMA without expanding the transmission band, a plurality of code channels are used.
There is a method of assigning to users, but in this case, the amount of interference also increases. Further, when the number of allocated code channels and the transmission power per channel are adaptively varied, or when used by a plurality of users, the amount of interference is not constant, and it is necessary to maintain synchronization even if the amount of interference changes. . Furthermore, in mobile communications, the condition of the communication path changes every moment due to the effects of selective and non-selective fading and interference from other users. There is a problem that E _b / N ₀ needs to be maintained. Where E _b is energy per bit, N ₀ is noise power, and E _b / N
₀ is the signal power standardized by the noise power.

Further, in a radio communication system, error control techniques such as an error correction code and Viterbi decoding are mainly used to improve communication quality, but a turbo code capable of obtaining a large coding gain has been studied. Therefore, adoption of the W-CDMA system is being considered. Under static characteristics such as a WGN (White Gaussian Noise) environment, the turbo code has a BER (Bit Error) even when E _b / N ₀ <2 dB.
Rate) <10 ^-5 is reported to be obtained. However, communication at such a low E _b / N ₀ has a problem that it is difficult to stably maintain synchronization and perform synchronous detection.

In view of the above-mentioned circumstances, the present invention provides an error control system using a turbo coding apparatus and a decoding apparatus so that a service for high-speed data transmission can be performed with high quality in addition to a service mainly for voice and low-speed data transmission. It is an object of the present invention to provide a spread spectrum communication device suitable for the communication.

[0010]

In order to achieve the above object, a spread spectrum communication apparatus according to the spread spectrum transmitting apparatus of the present invention has a variable spread output from a plurality of data transmitting sections.
A synthesizing unit for synthesizing a tone symbol sequence, and an output
And a transmitting unit for transmitting a modulated symbol sequence to be transmitted.
Serial data transmission section, the importance to the input data sequence, and adds redundant data defined in accordance with the speed, the symbol erasure of the data sequence is possible row Ukoto, is divided into a plurality data channel to generate the input symbol series
Means are capable, one or more of the input symbol sequence, and interleaving means that is possible to perform the rearrangement of data in each cycle determined for each sequence, the interleave in the interleaving means the symbol sequence output from the interleaving means in the case of performing the case of not performing the input symbol sequence, modulation means for outputting a modulation symbol sequence by modulating a modulation scheme determined for each series, a plurality of code sequences One code sequence
Code generation means for generating a plurality of identifiable code sequences,
One or more code sequences generated by the code generation means;
And performing code conversion for each modulation symbol sequence using
To generate one or more code channels
A tunnel generation means, consists one or more of the gain setting means adjusts the gain by the gain which is determined the converted modulated symbol sequence said code for each series.

A spread spectrum communication apparatus according to the present invention, which can achieve the above object, has an inverse code conversion section for identifying one code sequence by a code sequence, and a demodulation section for performing data demodulation. 1 having
One or more finger units, a demodulation symbol selection unit that divides a RAKE demodulation symbol output from the finger unit for each data sequence determined on the transmission side, and a demodulation symbol output from the demodulation symbol selection unit. A plurality of finger units, the demodulation symbol selection unit, and the symbol AGC that process the value to a desired value for each predetermined cycle, and according to the detected channel state and channel information. A control unit for controlling a reception processing operation with the symbol AGC, wherein the demodulation symbol selection unit generates a divided demodulation symbol by dividing the RAKE demodulation symbol into a data sequence determined on a transmission side. In the symbol AGC, an average value is calculated at a predetermined cycle for each of the divided data sequences, and the average value is used to calculate the divided demodulation signal. With performing division Le, depending on the situation and the channel information of the channel detected in the data for each sequence performs gain adjustment of the division demodulated symbol is to generate a demodulated symbol.

Further, a spread spectrum communication apparatus according to another spread spectrum receiving apparatus of the present invention capable of achieving the above object performs an inverse code conversion unit for identifying one code sequence by a code sequence, and performs data demodulation. One or more finger units having a demodulation unit; and
A demodulation signal allocating unit that allocates a received signal or a signal obtained by removing an interference wave with respect to an incoming wave allocated from the received signal; and a weighting factor for the incoming wave that is estimated from the received power of the detected incoming wave and channel information. An interference signal detection unit that generates a code sequence according to a coefficient and generates an interference replica signal of the arriving wave assigned to the finger unit, and a RAKE demodulated symbol output from the finger unit.
A demodulation symbol selection unit that divides each data sequence determined on the transmission side, and processes the values of the divided demodulation symbols output from the demodulation symbol selection unit so as to have a desired value at a predetermined cycle. The plurality of finger units, the demodulation signal allocation unit, the interference signal detection unit, the demodulation symbol selection unit, the symbol AGC, and the symbol AG in accordance with a symbol AGC, a detected channel state, and channel information.
A control unit for controlling C in accordance with the reception processing operation;
The demodulation symbol selection unit generates a divided demodulation symbol by dividing the RAKE demodulation symbol into a data sequence determined on the transmission side, and generates the symbol AGC
Then, an average value is calculated at a predetermined period for each of the divided data sequences, the divided demodulated symbols are divided by the average value, and the state of the communication channel and the channel information detected for each data sequence are calculated. If the gain of the divided demodulated symbol is adjusted according to the above, and the interference power is not removed, the control unit performs generation of a demodulated symbol by the finger unit, the demodulated symbol selecting unit, and the symbol AGC. When controlling the operation and removing the interference power, the control unit controls the interference signal detection unit, using the generated interference replica signal of the arriving wave, the signal allocation unit and the finger The control unit controls the operation of each unit so as to generate the demodulated symbol after the interference power is removed in the unit.

Further, in the spread spectrum communication apparatus according to the spread spectrum receiving apparatus of the present invention, when the predetermined cycle matches the interleave cycle, the symbol AGC includes the RAKE demodulated symbol at the interleave cycle. Calculate the average of
After deinterleaving the divided demodulated symbols, division of the deinterleaved divided demodulated symbols by the average value may be performed. Furthermore,
In the spread spectrum communication apparatus according to the spread spectrum receiving apparatus of the present invention, when there is a data sequence in which symbol erasure is performed, in the symbol AGC,
After adjusting the gain of the divided demodulated symbols, a symbol allocated for a lost symbol may be inserted at the position of the lost symbol.

According to such a spread spectrum communication apparatus of the present invention, redundant data determined according to importance and speed is added to an input data sequence, and symbols of the data sequence are erased as necessary. A code sequence that can be divided into a plurality of data channels as necessary, interleaved, and a modulation symbol sequence that is modulated and output according to a modulation scheme determined for each sequence and that can identify one code sequence from a plurality of code sequences Is used to perform code conversion. Therefore,
When transmitting data subjected to error correction coding, code symbols can be divided and transmitted, so that data can be transmitted at a variable data rate using one or more code channels according to the importance of the data and the transmission speed. Quality can be transmitted.

Further, when the predetermined period matches the interleave period and interleaving is performed on the transmission side, the average value of RAKE demodulated symbols is calculated at the predetermined period, and deinterleaving of the divided demodulated symbols is performed. After that, the divided demodulated symbols are divided by the average value, and the gain of the divided demodulated symbols is adjusted in accordance with the state of the channel and the channel information detected for each data sequence. Therefore, even when channel interleaving is performed for each data sequence, deinterleaving can be performed simultaneously with the average value calculation for each data sequence. Thereby, the influence of the transmission path can be reduced.

Further, if there is a data sequence in which symbol erasure has occurred, the average of the rake demodulated symbols is calculated at a predetermined cycle, and the divided demodulated symbols are divided by the average value to detect each data sequence. The gain of the divided demodulated symbol is adjusted in accordance with the channel state and the channel information, and the symbol allocated for the lost symbol is inserted at the position of the lost symbol. Even in this case, the calculation of the average value and the gain adjustment can be performed for each data sequence excluding the lost symbols, and thereafter, the lost symbols can be inserted. As a result, the data rate can be improved even when redundant data is added,
Data can be transmitted at high speed. Further, since the control unit can perform either a reception operation in which interference power is not removed or a reception operation in which interference power is removed, all of the interference removal processes are terminated according to the situation of the interference removal process. After that, or each time the interference removal processing is performed a plurality of times, the demodulated symbols can be generated from the RAKE demodulated symbols.

[0017]

Embodiments of the spread spectrum communication apparatus according to the present invention will be described below with reference to the drawings. First, in the spectrum communication device of the present invention,
FIG. 5 shows a schematic configuration of a spread spectrum transmitting apparatus according to the present invention for transmitting a spread spectrum signal. As shown in FIG. 5, the spread spectrum transmitting apparatus includes a transmission data selector 5
01, a transmitting unit 550, an adding unit 517, and a spreading unit 51.
8. The transmission unit 550 includes a first data transmission unit 520, a plurality of data transmission units of a second data transmission unit 521,..., An n-th data transmission unit 522, and a pilot signal transmission unit 523, and The transmission data assigned by the transmission data selector 501 is input to the transmission unit 520, the second data transmission unit 521,..., The n-th data transmission unit 522. The transmission data selector 501 allocates a plurality of transmission data having different data rates and communication qualities of the transmission data to the first data transmission unit 520 to the n-th data transmission unit 522 according to the format information.

The first data transmission unit 520 is a frame generation unit 5 that adaptively generates code symbols based on the time slot and processing gain set by the transmission data selector 501.
02, the QPSK modulation section 503 that performs QPSK modulation on the code symbols output from the frame generation section 502 and outputs QPSK modulation symbols, and multiplies the QPSK modulation symbols and the assigned orthogonal code 1 to perform orthogonal coding. And an amplifying unit 505 that amplifies the orthogonally coded modulation symbols output from the multiplying unit 504 with the assigned gain. Also,
The second data transmission unit 521 includes a transmission data selector 501
And a frame generation unit 506 that adaptively generates a code symbol with the time slot and processing gain set in the above.
BP that performs K modulation and outputs BPSK modulation symbols
An SK modulator 507, a QPSK modulator 510 that performs QPSK modulation on the code symbols output from the frame generator 506, and outputs QPSK modulated symbols;
Multiplying unit 5 that performs multiplication of each modulation symbol output from K modulation unit 507 and QPSK modulation unit 510 with orthogonal code 2 and orthogonal code 3 assigned to each modulation symbol.
08 and 511, and amplification sections 509 and 512 for amplifying each of the orthogonally coded modulation symbols with the gain allocated to each modulation symbol.

Further, the third to n-th data transmitting units 522 are constituted by the same circuit blocks as the first data transmitting unit 520. Furthermore, pilot signal transmitting section 523 performs QPSK modulation section 514 for performing QPSK modulation of known data (for example, all “1”).
A multiplication unit 515 for performing orthogonal multiplication by multiplying the modulation symbol output from the QPSK modulation unit 514 by the allocated orthogonal code 0, and amplifying the modulation symbol by the gain allocated to the orthogonally coded modulation symbol. And an amplifying unit 516 that performs the following. It should be noted that the pilot signal is transmitted with power larger than other code channels, and by receiving the pilot signal, synchronization can be achieved, and a multipath situation and an interference situation from multiple users can be detected. I have.

As described above, the first data transmission section 520 to the n-th data transmission section 522 and the pilot signal transmission section 523 form a plurality of code channels orthogonal to each other. These orthogonally coded modulation symbols of each code channel are all added in an adding section 517, and then the DS-S
The spectrum is spread by the PN code assigned for S and transmitted.

Next, FIG. 6 shows a schematic configuration of the frame generator 502 or the frame generator 506. In FIG. 6, an input buffer 601 includes a transmission data selector 50.
The transmission data read from the input buffer 601 is stored in the first channel interleaver 602, the first error correction encoder 603, and the turbo interleaver 60.
5 is supplied. 1st channel interleaver 60
In No. 2, channel interleaving for rearranging the transmission data supplied from the input buffer 601 is performed. This is for randomizing a data burst error generated by fading by rearranging the data. This first channel interleaver 6
02 are represented by x0, x1,.
, Xn.

The first error correction encoder 603 performs error correction encoding on the transmission data supplied from the input buffer 601 as necessary using the generator polynomial set by the format control section 611, and outputs the first erasure symbol section. 60
4 is output. The first symbol erasure section 604 performs symbol erasure according to each symbol erasure pattern set by the format control section 611 as necessary, and outputs the result to the second channel interleaver 608. In the second channel interleaver 608, the first channel
Channel interleaving for rearranging the transmission data supplied from the symbol erasure section 604 is performed. Further, the turbo interleaver 605 performs turbo interleaving on the transmission data supplied from the input buffer 601 and outputs the transmission data to the second error correction encoder 606. In the second error correction encoder 603, the transmission data supplied from the turbo interleaver 605 is subjected to error correction encoding according to the generator polynomial set by the format control section 611 as necessary, and the second symbol erasure section 607 is performed.
Output to Second symbol erasure section 607 performs symbol erasure according to each symbol erasure pattern set in format control section 611 as necessary, and outputs the result to third channel interleaver 609. The third channel interleaver 609 performs channel interleaving for rearranging the transmission data supplied from the second symbol erasure section 607 as necessary.

The erasure symbol patterns of the first symbol erasure section 604 and the second symbol erasure section 607 are, for example, patterns for alternately erasing symbols. The code symbols output from the second channel interleaver 608 are denoted by ya0, ya1,.
, And code symbols output from the third channel interleaver 609 are represented by yb0, yb1,.
, Ybn. Code symbols output from the first channel interleaver 602, the second channel interleaver 608, and the third channel interleaver 609 are supplied to a transmission symbol generation unit 610, where the code symbols are selected or parallelized as necessary. -Serial conversion is performed. This transmission symbol generator 6
When 10 is the frame generation unit 502 in the first data transmission unit 520, only one sequence of the first transmission symbol is output, and when the transmission symbol generation unit 610 is the frame generation unit 506 in the second data transmission unit 521, Outputs two sequences of a first transmission symbol and a second transmission symbol. The format control unit 611 also controls the input buffer 601 through the transmission symbol generation unit 61 so that the first transmission symbol and the second transmission symbol according to the format information given from the transmission data selector 501 are output.
It is a control unit that performs control of 0.

The operation of the thus-configured spread spectrum transmitting apparatus according to the present invention will be described with reference to an example of the modulation symbol generation timing shown in FIGS. FIG.
FIG. 7A shows the modulation symbol generation timing when channel interleaving is not performed and there is no lost symbol, and FIG. 7B is the modulation symbol generation timing when channel interleaving is performed but there is no lost symbol. FIG. 8 (a) shows the modulation symbol generation timing when channel interleaving is performed and there is a lost symbol. FIG. 8 (b) is channel interleaving and there are lost symbols and two orthogonal channels are used. This is the modulation symbol generation timing when used. In FIGS. 7A and 7B and FIGS. 8A and 8B, the coding rate when symbol erasure is not performed is 1 /.
3. The coding rate when symbol erasure is performed is １ ／.

Further, when the frame generation unit shown in FIG. 6 is used as frame generation unit 502, the second transmission symbol is not output, and the first transmission symbol is supplied to QPSK modulation unit 503 to output data serially. I do. Also,
When the frame generation unit shown in FIG. 6 is used as frame generation unit 506, the first transmission symbol is supplied to QPSK modulation unit 510, and the second transmission symbol is supplied to BPSK modulation unit 507, and the data is serially transmitted. It shall be output. In each figure, x0 to xn are the data sequence of the first code symbol output from the first channel interleaver 602, ya0 to yan are the data sequence of the second code symbol output from the second channel interleaver 608, yb0 Ybn indicates a data string of the third code symbol output from the third channel interleaver 609, and z is indefinite data, and here, the same code as the data "0" is assigned.

The modulation symbol generation timing without erasure symbols without performing the channel interleaving shown in FIG. 7A will be described with an example in which the frame generation unit shown in FIG. 6 is used as the frame generation unit 502. First, from the transmission data output from the transmission data selector 501, a first code symbol of the same sequence as the transmission data sequence,
A second code symbol obtained by performing error correction encoding on the same sequence by the first error correction encoder 603 and an interleave cycle n
After interleaving by the turbo interleaver 605, the third code symbol error-corrected and encoded by the second error-correction encoder 606 is output to the transmission symbol generation section 610. At this time, since the third code symbol is turbo-interleaved, the other first code symbol and the second
It is output with a delay of one cycle of turbo interleaving compared to the code symbol. Next, these first to third code symbols are subjected to parallel-to-serial conversion in the transmission symbol generation unit 610 in order of a first code symbol, a second code symbol, and a third code symbol.
Output as a transmission symbol. At this time, the time width of the first code symbol to the third code symbol is compressed to 1/3 and serially converted as shown.

Then, the first transmission symbol is supplied to QPSK modulation section 503 and QPSK-modulated, and QPSK modulation symbols msq0, msq2,..., Msqn are generated. Next, the orthogonal code 1 previously assigned to the modulation symbol and the modulation symbol are multiplied by the multiplication unit 5.
After being multiplied by 04 and subjected to orthogonal coding, the signal is amplified by the amplifying unit 505 with a desired gain setting value. Also,
When the frame generation unit shown in FIG. 6 is used as frame generation unit 506 and only the first transmission symbol is selected, FIG.
This is the same as the modulation symbol generation timing shown in FIG.

Next, the channel interleaving shown in FIG. 7B and the generation timing of modulation symbols without lost symbols will be described with reference to an example in which the frame generator shown in FIG. 6 is used as the frame generator 502. . First, from the transmission data output from the transmission data selector 501, a first code symbol obtained by interleaving the same sequence as the transmission data sequence by the channel interleaver 602 having an interleave cycle n and the same sequence by the first error correction encoder 603. Error correction coding, and then interleave the same sequence with a second code symbol interleaved by a channel interleaver 608 having an interleave period n and a turbo interleaver 605 having an interleave period n, and then by a second error correction encoder 606 After error correction coding, the third interleaved channel interleaver 609 with an interleave period n
The code symbol is output to transmission symbol generation section 610. At this time, since the third code symbol is turbo-interleaved, it is output with a delay of one cycle of turbo interleaving compared to the other first and second code symbols.

Next, the first code symbol to the third code symbol
The code symbol is sequentially subjected to parallel-serial conversion in the transmission symbol generation section 610 in the order of a first code symbol, a second code symbol, and a third code symbol, and is output as a first transmission symbol. At this time, the time width of the first to third code symbols is 1/3 as shown in FIG.
And converted to serial. Then, the first transmission symbol is supplied to QPSK modulation section 503 and QPSK modulated, and QPSK modulation symbols msq0, msq2,.
.., Msqn are generated. Next, the orthogonal symbol 1 previously assigned to the modulation symbol is multiplied by the modulation symbol by the multiplier 504 and orthogonally encoded, and then amplified by the amplifier 505 with a desired gain setting value. When the frame generation unit shown in FIG. 6 is used as the frame generation unit 506 and only the first transmission symbol is selected, the timing becomes the same as the modulation symbol generation timing shown in FIG. 7B.

Next, a description will be given of an example in which the channel interleaving shown in FIG. 8A is performed and the modulation symbol generation timing with a lost symbol is used as the frame generation unit 502 shown in FIG. . First, from the transmission data output from the transmission data selector 501, a first code symbol obtained by interleaving the same sequence as the transmission data sequence with the channel interleaver 602 having an interleave cycle n and the same sequence by the first error correction encoder 603. After performing error correction coding and then erasing the odd-numbered symbols in the first symbol erasure section 604, the second code symbol interleaved by the channel interleaver 608 with the interleave cycle n / 2 and the same sequence are interleaved with the interleave cycle n Are interleaved by the turbo interleaver 605, error-correction-coded by the second error-correction encoder 606, and then the even-numbered symbols are erased by the second symbol erasure unit 607.
Further, the third code symbol interleaved by channel interleaver 609 having an interleave cycle of n / 2 is output to transmission symbol generation section 610. At this time, since the third code symbol is turbo-interleaved, it is output with a delay of one cycle of turbo interleaving compared to the other first and second code symbols. Further, since the symbols of the second code symbol and the third code symbol are alternately deleted, the number of the symbols is half that of the first code symbol.

Next, the transmission symbol generator 610 performs parallel-serial conversion in the order of the first code symbol-the second code symbol-the first code symbol-the third code symbol, and outputs the result as a first transmission symbol. At this time, the time width of the first code symbol to the third code symbol is reduced to 1/2 and serially converted as shown in the figure. This first transmission symbol is supplied to QPSK modulation section 503, and QPSK-modulated, and modulation symbols msq0, msq
2,..., Msqn are generated. Then, the orthogonal code 1 previously assigned to this modulation symbol
And the modulation symbol are multiplied by the multiplication unit 504 and orthogonally encoded, and then amplified by the amplification unit 505 with a desired gain setting value. When the frame generation unit shown in FIG. 6 is used as the frame generation unit 506 and only the first transmission symbol is selected, the timing becomes the same as the modulation symbol generation timing shown in FIG.

Next, channel interleaving shown in FIG. 8 (b) is performed, and there are lost symbols, and the modulation symbol generation timing when two orthogonal channels are used, the frame generator shown in FIG. 6 is used as the frame generator 506. An example will be described. First, the transmission data selector 501
A first code symbol obtained by interleaving the same sequence as the transmission data sequence with the channel interleaver 602 having an interleave cycle n from the transmission data output from
The same sequence is error-correction-coded by a first error-correction encoder 603, and then the first symbol erasure unit 604 eliminates odd-numbered symbols.
After interleaving the second code symbol interleaved by the channel interleaver 608 with the turbo interleaver 605 having an interleave period n, error-encoding by the second error correction encoder 606, In the symbol erasure section 607, the even-numbered symbols are erased, and the interleave cycle n
The third code symbol interleaved by the / 2 channel interleaver 609 is output to the transmission symbol generation section 610. At this time, since the third code symbol is turbo-interleaved, it is output with a delay of one cycle of turbo interleaving compared to the other first and second code symbols. Further, since the symbols of the second code symbol and the third code symbol are alternately deleted, the number of the symbols is half that of the first code symbol.

In transmission symbol generation section 610, the first code symbol is output as a second transmission symbol, and the second and third code symbols are calculated as (second code symbol-third code symbol).
The parallel-to-serial conversion is sequentially performed in the order of the code symbols, and each is output as a first transmission symbol. At this time, the time width of the second code symbol and the third code symbol is reduced to 1/2 and serially converted as shown. The second transmission symbol consisting of the first code symbol is
The BPSK modulator 507 performs BPSK modulation on the second
Modulation symbols (msb0, msb2,..., Ms
bn) is generated, and the first transmission symbol including the second code symbol and the third code symbol is output to the QPSK modulation section 510.
Are QPSK-modulated in the first modulation symbol (msq
0, msq2,..., Msqn).
Next, the first modulation symbol is multiplied by a pre-assigned orthogonal code 2 by a multiplication unit 508 and orthogonally coded, and then amplified by an amplification unit 509 with a desired gain setting value. In addition, the second modulation symbol is multiplied by the orthogonal code 3 assigned in advance by the multiplier 511 and orthogonally encoded, and then amplified by the amplifier 512 with a desired gain setting value.

Each of the orthogonally coded modulation symbols generated and amplified at any one of the above-described modulation symbol generation timings, and the modulation symbol obtained by orthogonally encoding and amplifying known data as a pilot signal are as follows: The addition is performed by the adding unit 517 at the same timing so that the orthogonalization can be maintained, and the data is spread by the spreading unit 518 using a PN code for spreading and transmitted. With such a configuration, not only a code symbol is transmitted using only one orthogonal code, but also a two orthogonal code or, although not shown, three or more code channels in which the transmission symbol output from the transmission symbol generation unit 610 is orthogonal. Can also be sent.
As a result, modulation or orthogonal codes can be assigned independently for each code symbol, and the gain can be set independently, so that the data hierarchy can be adaptively adjusted according to data weighting, data transmission speed, and communication channel conditions. Can be made possible.

Next, in the spread spectrum communication apparatus according to the present invention, the schematic configuration of the spread spectrum receiving apparatus according to the present invention for receiving the spread spectrum signal transmitted by the above described spread spectrum transmitting apparatus according to the present invention will be described. As shown in FIG. The spread spectrum receiving apparatus shown in FIG.
It is composed of a part that performs RAKE reception, a part that performs interference cancellation, and a part that performs turbo decoding. Hereinafter, the configuration will be described in detail. The searcher 101 measures the state of a communication channel such as the phase offset and power of a spread code sequence (hereinafter, PN code) determined by the relative delay time of an incoming wave arriving with a propagation delay. Code sequence code-multiplexed with the phase offset and orthogonal code in the finger unit and channel combining unit (hereinafter, orthogonal code)
Assign numbers. Further, when performing the interference removal processing, the power of the arriving wave other than the phase offset assigned to the finger unit is output to the interference signal detection unit 105.

The buffer 102 is a buffer for storing an input received signal, and is used for interference removal processing.
The demodulation signal allocating section 103 outputs the input received signal to the finger section of the rake receiving section 104 when demodulating the received signal, and outputs the received signal read out from the buffer 102 when demodulating the interference-eliminated signal. A signal from which an interference replica signal corresponding to the finger unit has been removed is selected from the signal and output to the finger unit in the rake receiving unit 104. The RAKE receiving unit 104 includes a plurality of finger units that perform despreading, inverse orthogonal transform, demodulation, reference signal generation, and synchronization maintenance, and a channel combining unit that combines the outputs of the plurality of finger units.
Receiving or parallel demodulation is performed, and RAKE demodulated symbols are generated according to timing given from the system control unit 109.

Demodulation symbol selection section 106 divides the RAKE demodulation symbol output from RAKE receiving section 104 for each data sequence determined on the transmission side to generate a divided demodulation symbol, and generates the generated divided demodulation symbol. Is output to the symbol AGC 107 in accordance with the timing given from the system control unit 109. The data sequence determined on the transmission side is, for example, a first code symbol, a second code symbol supplied to the transmission symbol generation unit 610 shown in FIG.
It is a series of code symbols and a third code symbol. The symbol AGC 107 calculates the average in a predetermined cycle (for example, the cycle of the channel interleaver) for each data sequence, and divides the demodulated symbols by the calculated average to remove the fluctuation in the cycle. Is normalized to Next, the gain of the divided demodulated symbol is adjusted in accordance with the state of the communication path and the channel information detected for each data sequence. Turbo decoding unit 108
Are two decoders and two turbo interleavers, 1
It consists of two turbo deinterleavers and a hard decision unit and performs turbo decoding by a turbo algorithm.

The system control unit 109 includes the searcher 10
The searcher 101, buffer 102, signal Allocating unit 103, RAKE receiving unit 10
4. Interference power detection section 105, demodulation symbol selection section 10
6. The receiving operation of the symbol AGC 107 and the turbo decoding unit 108 is controlled.

Next, FIG. 2 shows a schematic configuration of the demodulation symbol selection section 106. Referring to FIG.
Is a register for storing the rake demodulated symbols output from the rake receiving unit 104,
Is the RAKE demodulated symbol output from the RAKE receiving section 104 and the delayed RAK output from the register 201.
A selector for selecting any one of the E demodulated symbols. The S / P conversion unit 203 divides the demodulated symbols serially output from the selector 202 into first to third divided demodulated symbols and performs parallel conversion so as to be converted into an original symbol sequence. It is a conversion unit. The symbol setting unit 204 includes the system control unit 1
According to the system information given from 09, the control of the register 201, the selector 202, and the P / S converter 203 is performed so that the serial demodulated symbol can be divided into the first to third demodulated symbols.

Next, a schematic configuration of the symbol AGC 107 is shown in FIG. In FIG. 3, channel deinterleavers 301, 305, and 310 have one cycle of first divided demodulated symbols to one cycle when channel interleaving is not performed on the divided demodulated symbols at a predetermined average value calculation cycle. When the three-divided demodulated symbols are stored and channel interleaving is performed at a predetermined average value calculation cycle, one cycle of channel deinterleaving corresponding to each channel interleave pattern is performed. . Average value calculation unit 302,
306 and 311 denote the first divided demodulated symbols for one cycle,
An average value of each symbol of the third divided demodulated symbol is calculated, and the average value is divided by dividers 303, 307, and 312.
To supply. Dividing sections 303, 307, and 312 respectively convert the symbols output from channel deinterleavers 301, 305, and 310 into average value calculating sections 302, 30.
Symbols are normalized by dividing by respective average values supplied from 6, 311. Thereby, even if the level of the demodulated symbol fluctuates due to amplitude fluctuation due to facing, multipath, or interference from other users, the level of the symbol can be kept constant at each interleave cycle.

Amplifying sections 304, 308, and 313 have respective gains k set by symbol AGC control section 318.
At 1, k2 and k3, the symbols output from the division units 303, 307 and 313 are amplified. First erasure symbol insertion section 309, second erasure symbol insertion section 314
In the case where the divided demodulated symbols are periodically lost on the transmitting side, the symbols assigned for the lost symbols are inserted at the positions where the symbols are lost, to have the same number of symbols as the original. The output buffers 315, 316, 317
The amplifying section 304 or the first erasure symbol insertion section 309, the second
The demodulated symbols output from erasure symbol insertion section 314 are stored, and the demodulated symbols repeatedly stored at the timing given from symbol AGC control section 318 are output. The symbol AGC control unit 318 controls the channel interleaver 301 or the output buffer 317 so that the above processing can be performed according to the system information given from the system control unit 109.

Next, a schematic configuration of the turbo decoding unit 108 is shown in FIG. In FIG. 4, first decoder 401 performs the first decoding using the first demodulated symbol and the second demodulated symbol output from symbol AGC 107, and performs the first and second decodings on first turbo deinterleaver 404. Together with the prior information likelihood output from MAP (Maximum
A Posteriori probability or SOVA (Soft Out)
A soft decision decoding data and prior information likelihood are generated by decoding such as put Viterbi Algorithm). The first turbo interleaver 402 performs turbo interleaving of the prior information likelihood output from the first decoder 401, and supplies the output to the second decoder 405. Further, second turbo interleaver 403 performs turbo interleaving of the first demodulated symbol, and supplies its output to second decoder 405. In addition, the first turbo
The deinterleaver 404 performs turbo deinterleaving of the prior information likelihood output from the second decoder 405, and supplies the output to the first decoder 401. Then, since the third demodulated symbol directly supplied to the second decoder 405 is turbo-interleaved on the transmission side, the second decoder 405 provides the turbo-interleaved prior information likelihood and the first demodulation, respectively. Symbol, third
Demodulated symbols will be provided.

In the second decoder 405, the first demodulated symbol output from the turbo interleaver 403 and the third demodulated symbol
MAP or SOV together with the demodulated symbol and the prior information likelihood output from first turbo interleaver 402
A decoding generates soft decision decoded data and prior information likelihood. The soft decision decoding data output from the second decoding unit 405 is subjected to a hard decision in the hard decision unit 406 to become binary decoded data. This hard-decision decoded data is subjected to turbo deinterleaving in second turbo deinterleaver 407 and output as decoded data. Note that the control unit 408 is the system control unit 1
09 so that the turbo decoding is performed according to the system information given from the first decoder 401 through the second turbo.
The deinterleaver 407 is controlled.

Next, the operation of the thus-configured spread spectrum receiving apparatus according to the present invention will be described with reference to an example of the demodulated symbol generation timing shown in FIGS. However, all the examples shown in FIGS. 9 to 11 show cases where channel interleaving is performed on the transmitting side, and FIG. 9A shows demodulated symbols in the case where interference cancellation is not performed and there is no lost symbol. FIG. 9 (b) shows the generation timing. FIG. 9 (b) shows the demodulated symbol generation timing in the case where there is a lost symbol without performing interference cancellation. FIG. 10 uses only the RAKE demodulated symbol after the interference cancellation is completed. FIG. 11 shows a demodulated symbol generation timing in the case where interference cancellation is performed and a RAKE demodulated symbol is used for each interference cancellation. The coding rate when no symbol erasure is performed is １ ／, and the coding rate when symbol erasure is performed is ２. FIG.
0 and FIG. 11 show the demodulated symbol generation timing only when there is no lost symbol. X in each figure
0 to Xn are the received data sequence of the first code symbol,
Yan is a received data sequence of the second code symbol, Yb0 to Yb
bn indicates a received data sequence of the third code symbol,
z is indefinite data, and here, the same sign as the data “0” is assigned. Also, ps indicates a lost symbol.

The demodulated symbol generation timing in the case where the interference cancellation shown in FIG.
This will be described with reference to FIGS. First, RAK
The RAKE demodulated symbols serially output from E receiving section 104 are input to demodulated symbol selecting section 106.
The RAKE demodulated symbols are input in the order of Xi-Yai-Ybi in the steady state as shown in the figure, that is, in the order of the first code symbol-the second code symbol-the third code symbol. Therefore, the RAKE demodulated symbol is serially / parallel-converted by demodulated symbol selecting section 106 in the order of a first code symbol-a second code symbol-a third code symbol, so that a first divided demodulated symbol and a second divided demodulated symbol are obtained. , And generate a third divided demodulated symbol. Each of the generated first divided demodulated symbols, second
The divided demodulated symbol and the third divided demodulated symbol are output from S / P conversion section 203 in demodulated symbol selection section 106. At this time, the time width of each symbol is 3
It will be doubled.

The first divided demodulated symbol, the second divided demodulated symbol, and the third divided demodulated symbol output from S / P conversion section 203 are input to symbol AGC 107, and average value calculation sections 302, 307, and 312 thereof. In, the average value of one interleave length n symbols is calculated. According to the calculation result, the divided demodulated symbols that have been channel deinterleaved by the respective channel deinterleavers 301, 305, and 310 are divided by the division unit 30.
Division at 3, 307, 312 yields 1
Symbols normalized over the interleave length are calculated. Subsequently, the respective normalized symbols are amplified by the amplification units 304, 308, and 313 according to a desired gain setting value.
And a demodulated symbol is generated.

This demodulated symbol is stored in each output buffer 315, 316, 317 for one frame, and in the next frame, the turbo decoding unit 108
Are output as a first demodulated symbol, a second demodulated symbol, and a third demodulated symbol in accordance with the output timing required in. Here, the number of iterates for turbo decoding is k
Therefore, the same symbol is read out k times and turbo-decoded for each frame. FIG. 10A shows only the timing of the RAKE demodulated symbols for three frames from frame x to frame x + 2 in the steady state. As shown in FIG. 9A, since the third code symbol is turbo-interleaved on the transmission side, it is transmitted with a delay of one cycle of turbo interleaving. As described above, in the frame x which is the first frame, the third code symbol does not exist, and this is indicated as the indefinite symbol z. Therefore, the first to third demodulated symbols are demodulated at the time point of the frame x + 1 which is further delayed by one frame as shown in FIG. It is the time of x + 2.

Next, the demodulated symbol generation timing when there is a lost symbol without performing the interference cancellation shown in FIG. 9B will be described with reference to FIGS. First,
RAK serially output from RAKE receiving section 104
The E demodulated symbol is input to demodulated symbol selection section 106. This rake demodulated symbol is Xi-Yai-X (i + 1) -Yb (i +
1), that is, the first code symbol-the second code symbol-the next first code symbol-the next third code symbol. Therefore, this rake demodulated symbol is
Xi-Yai-X in demodulation symbol selection section 106
By performing serial-parallel conversion in the order of (i + 1) -Yb (i + 1), the first divided demodulated symbol and the second
A divided demodulated symbol, a next first divided demodulated symbol, and a next third divided demodulated symbol are used. At this time, the number of divided demodulated symbols per frame length is such that the first divided demodulated symbol is n symbols, and the second divided demodulated symbol is only the even numbered symbol because the corresponding odd number of the second code symbol has been lost. In the third demodulated symbol, the even number of the corresponding third code symbol is eliminated, so that only the odd number symbol becomes n / 2 symbol. The first divided demodulated symbol, the second divided demodulated symbol, and the third divided demodulated symbol are output from the S / P converter 203 in the demodulated symbol selector 106.
At this time, the time width of the first divided demodulated symbol is doubled, and the time width of the second divided demodulated symbol and the third demodulated symbol is quadrupled.

The first divided demodulated symbol, the second divided demodulated symbol, and the third divided demodulated symbol output from S / P conversion section 203 are converted into first divided demodulated symbols in symbol AGC 107 by average value calculating sections 302, 307, and 312. The average value of each of the demodulated symbols is n symbols of one interleave length, and the second and third divided demodulated symbols are n / 2 symbols of イ ン タ ー interleave length. According to the calculation result, each channel
The divided demodulated symbols that have been channel deinterleaved by deinterleavers 301, 305, and 310 are
03, 307, 312. At this time, for the first divided demodulated symbol, a symbol normalized over one interleave length is calculated, and for the second divided demodulated symbol and the third divided demodulated symbol, the normalized symbol is normalized over 1/2 interleave length. The symbol is calculated. Subsequently, each of the normalized symbols is amplified by the amplification units 304, 308, and 313 according to a desired gain setting value. Further, in the second divided demodulated symbol, predetermined erasure symbols are inserted at odd-numbered symbol positions eliminated on the transmission side in first erasure symbol insertion section 309, and in the third divided demodulation symbol, second erasure symbol insertion section is used. At 314, a predetermined erasure symbol is inserted at an even-numbered symbol position. The first demodulated symbol thus generated, the second demodulated symbol
One frame of the demodulated symbol and the third demodulated symbol are stored in the output buffers 315, 316, and 317.

The first demodulated symbol, the second demodulated symbol, and the third demodulated symbol are used in the next frame in the turbo decoding unit 10.
Output buffer 3 according to the output timing required in
15, 316, 317 and read from turbo decoding unit 1
08. Here, iter that performs turbo decoding
Since the number of times of ate decoding is k times, the same symbol is read out k times in each frame and turbo-decoded. FIG. 9B shows only the timing of the RAKE demodulated symbols for three frames from frame x to frame x + 2 in the steady state. Note that FIG.
As shown in (b), since the third code symbol is turbo-interleaved on the transmission side, it is transmitted with a delay of one cycle of turbo interleaving. As described above, in the frame x which is the first frame, the third code symbol does not exist, and this is indicated as the indefinite symbol z. Therefore, the first to third demodulated symbols are demodulated at the time point of the frame x + 1 which is further delayed by one frame as shown in FIG. It is the time of x + 2.

Next, the demodulated symbol generation timing when the interference cancellation shown in FIG. 10 is performed and only the RAKE demodulated symbols after the interference cancellation is used will be described. Although the timing of the RAKE demodulation symbol without interference cancellation is shown at the top in FIG. 10, only the RAKE demodulation symbol after interference cancellation shown in the second stage is actually output. In this case, a delay corresponding to the execution of the interference removal processing occurs, so that the input of the RAKE demodulation symbol to the demodulation symbol selection unit 106 is delayed by the delay amount of the interference removal processing as illustrated. FIG. 9 shows the generation timing of the first divided demodulated symbol, the second divided demodulated symbol, and the third divided demodulated symbol, and the generation timing of the first demodulated symbol, the second demodulated symbol, and the third demodulated symbol.
Since it is the same as (a), the description is omitted.

Next, the demodulated symbol generation timing when the interference cancellation shown in FIG. 11 is performed and the RAKE demodulated symbol for each interference cancellation is used will be described with reference to FIGS. At the demodulated symbol generation timing shown in FIG. 11, the RAKE demodulated symbols for each of the interference removal processes performed a plurality of times are assigned as demodulated symbols for each of the iterative decoding times of the turbo decoding unit 108. Here, the number of times of interference removal processing and the number of times of iterate decoding are four. The RAKE demodulated symbol that has been subjected to the interference removal processing once has a corresponding delay, so that the input of the RAKE demodulated symbol to the demodulated symbol selector 106 is delayed by the delay amount as shown in the figure. The interference removal processing is performed in the order of the first time, the second time, the third time, and the fourth time with a clock four times the symbol rate.
The AKE demodulated symbols are sequentially transmitted to the demodulated symbol selecting unit 1 in that order.
The operation of the rake receiving unit 104 is controlled by the system control unit 109 so as to be input to the input unit 06.

The details will be described below. First, RA
The RAKE demodulated symbols serially output from KE receiving section 104 are input to demodulated symbol selecting section 106. The RAKE demodulated symbols are input in the order of Xi-Yai-Ybi in the steady state as shown in the figure, that is, in the order of the first code symbol-the second code symbol-the third code symbol. Therefore, the RAKE demodulated symbol is serially / parallel-converted by demodulated symbol selecting section 106 in the order of a first code symbol-a second code symbol-a third code symbol, so that a first divided demodulated symbol and a second divided demodulated symbol are obtained. , And generate a third divided demodulated symbol. Each generated first divided demodulated symbol,
The second divided demodulated symbol and the third divided demodulated symbol are output from S / P conversion section 203 in demodulated symbol selection section 106. At this time, the time width of each symbol is extended three times. Become.

The first divided demodulated symbol, the second divided demodulated symbol, and the third divided demodulated symbol output from S / P conversion section 203 are input to symbol AGC 107, and average value calculation sections 302, 307, and 312 thereof. , An average value of n symbols of one interleave length is calculated. Based on the calculation result, the divided demodulated symbols that have been channel deinterleaved by the respective channel deinterleavers 301, 305, and 310 are divided by division units 303, 307, and 312, and normalized over one interleave length. The calculated symbol is calculated. Subsequently, each normalized symbol is amplified by the amplification units 304, 308, and 313 according to a desired gain setting value, and a demodulated symbol is generated.

The above operation is performed independently in the first to fourth interference removal processing. Finally, the respective symbols are stored in the respective output buffers 315, 316, and 317, and the first to third demodulated symbols of the first number of interference removal processing times are requested by the turbo decoding unit 108 at the time of the first decoding of the iterate decoding number. It is output to turbo decoding section 108 according to the output timing. After that, it
During the second decoding of the erate decoding number, the first to third demodulated symbols of the second number of interference removal processing times are
The first to third demodulated symbols for the third time of the interference removal processing at the time of the third decoding of the decoding number are the first to third demodulated symbols of the fourth time for the interference removal processing at the time of the fourth decoding for the iterate decoding number. It is output to turbo decoding section 108 according to the output timing required by turbo decoding section 108. In FIG. 11, the frame x in the steady state is shown.
3 shows only the timing of the RAKE demodulated symbols for three frames of frame x + 2.

In the above description, the number of times of interference removal and iter
Although the number of times of ate decoding has been described as four, the present invention is not limited to this.
ate decoding times. Further, on the transmitting side, any number of modulation units can be provided in parallel.

[0057]

As described above, the spread spectrum communication apparatus of the present invention adds redundant data determined according to importance and speed to an input data sequence, and performs symbol erasure of the data sequence as necessary. A code sequence that can be divided into a plurality of data channels as necessary, interleaved, and a modulation symbol sequence that is modulated and output according to a modulation scheme determined for each sequence and that can identify one code sequence from a plurality of code sequences Is used to perform code conversion. Therefore, when transmitting data subjected to error correction coding, code symbols can be divided and transmitted, so that one or more code channels can be used at a variable data rate according to the importance of the data and the transmission speed. Can be transmitted with high quality.
Further, according to the spread spectrum communication apparatus of the present invention which receives data transmitted in this way, it is possible to divide a RAKE demodulated symbol that has undergone RAKE reception or parallel demodulation for each sequence determined on the transmission side, and Since the gain can be adjusted independently for each stream, the reliability of data demodulation can be improved.

Further, if the predetermined period matches the interleave period and the transmitting side performs interleaving, the average value of RAKE demodulated symbols is calculated at the predetermined period, and deinterleaving of the divided demodulated symbols is performed. After that, the divided demodulated symbols are divided by the average value, and the gain of the divided demodulated symbols is adjusted in accordance with the state of the channel and the channel information detected for each data sequence. Therefore, even when channel interleaving is performed for each data sequence, deinterleaving can be performed simultaneously with the average value calculation for each data sequence. Thereby, the influence of the transmission path can be reduced.

Further, when there is a data sequence in which symbol erasure has occurred, the average of the rake demodulated symbols is calculated at a predetermined period, and the divided demodulated symbols are divided by the average value to detect each data sequence. The gain of the divided demodulated symbol is adjusted in accordance with the channel state and the channel information, and the symbol allocated for the lost symbol is inserted at the position of the lost symbol. Even in this case, the calculation of the average value and the gain adjustment can be performed for each data sequence excluding the lost symbols, and thereafter, the lost symbols can be inserted. As a result, the data rate can be improved even when redundant data is added,
Data can be transmitted at high speed. Further, since the control unit can perform either a reception operation in which interference power is not removed or a reception operation in which interference power is removed, all of the interference removal processes are terminated according to the situation of the interference removal process. After that, or each time the interference removal processing is performed a plurality of times, the demodulated symbols can be generated from the RAKE demodulated symbols.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a spread spectrum receiving apparatus according to a spread spectrum communication apparatus of the present invention.

FIG. 2 is a schematic configuration diagram of a demodulation symbol selection unit of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 3 is a schematic configuration diagram of a symbol AGC unit of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 4 is a schematic configuration diagram of a turbo decoding unit of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 5 is a schematic configuration diagram of a spread spectrum transmitting apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 6 is a schematic configuration diagram of a frame generation unit of the spread spectrum transmitting apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 7 is a diagram showing a specific example of allocation of modulation symbol generation timing of a spread spectrum transmitting apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 8 is a diagram illustrating a specific example of allocation of modulation symbol generation timings of a spread spectrum transmitting apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 9 is a diagram showing a specific example of allocation of demodulated symbol generation timings of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 10 is a diagram showing a specific example of allocation of demodulated symbol generation timings of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

FIG. 11 is a diagram showing a specific example of allocation of demodulated symbol generation timings of the spread spectrum receiving apparatus according to the spread spectrum communication apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 101 searcher 102 buffer 103 demodulation signal allocating unit 104 RAKE receiving unit 105 interference signal detecting unit 106 demodulated symbol selecting unit 107 symbol AGC 108 turbo decoding unit 109 system control unit 201 register 202 selector 203 S / P conversion unit 204 symbol setting unit 301 , 305, 310 Channel interleavers 302, 306, 311 Average value calculation units 303, 307, 312 Division units 304, 308, 313 Amplification units 309 First erasure symbol insertion units 314 Second erasure symbol insertion units 315, 316, 317 Output buffer 318 Symbol AGC control unit 401 First decoding unit 402,403 Turbo interleaver unit 404 Turbo deinterleaver unit 405 Second decoding unit 406 Hard decision unit 407 Turbo Dane Reaver 408 Control unit 501 Transmission data selector 502, 506 Frame generation unit 503, 510, 514 QPSK modulation unit 507 BPSK modulation unit 504, 508, 511, 515 Multiplication unit 505, 509, 512, 516 Amplification unit 513 Data transmission unit n 517 Adder 518 Spreader 601 Input buffer 602, 608, 609 Channel interleaver 603 First error correction encoder 604 First symbol erasure unit 605 Turbo interleaver 606 Second error correction encoder 607 Second symbol erasure unit 610 Transmission Symbol generation unit 611 Format control unit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-247045 (JP, A) JP-A-10-200445 (JP, A) JP-A-63-121332 (JP, A) IEICE Technical Report, RCS98-227 Proceedings of the 1997 IEICE General Conference, Transactions 1, p. 443 1996 IEICE Communications Society Conference Proceedings 1, p. 302 1996 IEICE General Conference Lectures, Transactions 1, p. 387 (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/69-1/713 H04J 13/00-13/06 H04L 1/00

Claims (5)

(57) [Claims] 1. A modulation output from a plurality of data transmission units.
A combining unit for combining the symbol sequences, and a transmitting unit for transmitting the modulation symbol sequence output from the combining unit.
And a signal unit, wherein the data transmission section, the importance to the input data sequence, and adds redundant data defined in accordance with the speed, the symbol erasure of the data series can <br/> line Ukoto and is, data and <br/> means being possible to generate an input symbol sequence is divided into a plurality data channels, one or more of the input symbol sequence, each period determined for each sequence of the <br/> interleaving means is possible to perform the reordering, the symbol sequence output from interleaving means when performing interleaving in the interleaving means, the case of not performing the input symbol sequence, each sequence And a modulation means for outputting a modulation symbol sequence by modulating with a modulation method defined in, a plurality of code sequences capable of identifying one code sequence from a plurality of code sequences
Code generation means for generating a code sequence; and one or more code sequences generated by the code generation means.
And performing code conversion for each modulation symbol sequence using
To generate one or more code channels
Channel generating means, and one or more gain setting means for performing gain adjustment of the code-converted modulated symbol sequence with a gain determined for each sequence.
Spread spectrum communication device comprising the steps, in that it consists of. 2. An inverse code converter for identifying one code sequence by a code sequence, one or more finger units having a demodulation unit for performing data demodulation, and a RAKE demodulation symbol output from the finger unit. A demodulation symbol selection unit that divides each data sequence determined on the transmission side, and processes a value of the division demodulation symbol output from the demodulation symbol selection unit to a desired value at a predetermined cycle. A symbol AGC; and a control unit that controls a reception processing operation of the plurality of finger units, the demodulation symbol selection unit, and the symbol AGC in accordance with the detected channel state and channel information, The selector generates a divided demodulated symbol by dividing the RAKE demodulated symbol into a data sequence determined on the transmission side. In the AGC, an average value is calculated at a predetermined cycle for each of the divided data sequences, the divided demodulated symbols are divided by the average value, and the condition of the communication path detected for each data sequence is determined. A spread spectrum communication apparatus, wherein a gain of the divided demodulated symbol is adjusted according to channel information to generate a demodulated symbol. 3. An inverse code conversion unit for identifying one code sequence by a code sequence, one or more finger units having a demodulation unit for performing data demodulation, and assigning to the finger unit a received signal or a received signal. A demodulation signal allocating unit for allocating a signal from which an interference wave has been removed with respect to the detected arriving wave; and An interference signal detection unit that generates an interference replica signal of the arriving wave generated and assigned to the finger unit; and a demodulation that divides a RAKE demodulation symbol output from the finger unit for each data sequence determined on a transmission side. A symbol selecting unit, and processing the value of the divided demodulated symbols output from the demodulated symbol selecting unit to a desired value every predetermined period. The plurality of finger units, the demodulation signal allocation unit, the interference signal detection unit, the demodulation symbol selection unit, the symbol AGC, and the symbol AGC according to the detected channel state and channel information. A control unit that controls AGC in accordance with a reception processing operation, wherein the demodulation symbol selection unit generates a divided demodulation symbol by dividing the RAKE demodulation symbol into a data sequence determined on a transmission side. In the symbol AGC, an average value is calculated at a predetermined cycle for each of the divided data sequences, the divided demodulated symbols are divided by the average value, and the condition of the communication path detected for each data sequence is determined. When the gain of the divided demodulated symbol is adjusted according to the channel information and the interference power is not removed, the finger unit may be used.
The demodulated symbol selection unit, the control unit controls the operation to generate a demodulated symbol by the symbol AGC, and when the interference power is removed, the control unit controls the interference signal detection unit. By using the generated interference replica signal of the arriving wave, after removing interference power in the signal allocating unit and the finger unit, the control unit operates the units so as to generate the demodulated symbols. A spread spectrum communication apparatus characterized by controlling the following. 4. When the predetermined period coincides with an interleave period, the symbol AGC calculates an average value of the rake demodulated symbols at the interleave period and deinterleaves the divided demodulated symbols. 4. The spread spectrum communication apparatus according to claim 2, wherein the division is performed on the divided demodulated symbols deinterleaved by the average value. 5. When there is a data sequence in which symbol erasure is performed, after adjusting the gain of the divided demodulated symbol in the symbol AGC, a symbol allocated for the erasure symbol is inserted into the position of the erasure symbol. 4. The spread spectrum communication apparatus according to claim 2, wherein: