JP2002141837A - Ds-cdma transmitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy in channel estimation based on a pilot symbol by removing a mutual correlation between the pilot symbols of respective code channels in CDMA multiplexing for performing high-speed signal transmitting. SOLUTION: In each of frame constitution pats 11, the pilot symbol of channel estimation for synchronizing detection is inserted to the encoded information data of each of code channels in a fixed cycle and next, the data are modulated in a modulator 12. In a spread modulator 13, the modulated data symbol of each of code channels from each of modulators 12 are spread by a spread code (SC-X)×(LC-Y) concerning the pilot symbol and spread by a spread code (SC-P)×(LC-Y) (P:1 to N) for each sub-code concerning an information symbol. Then, the spread codes of respective code channels are added and transmitted in an adder 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system for performing multiple access using spread spectrum.
S-CDMA (DS: direct sequence)
e) A transmission method, and more particularly, to a DS-CDMA transmission method for code-multiplexing a plurality of code channels.

[0002]

2. Description of the Related Art DS-CD is a next-generation mobile communication system.
Research and development of the MA method are being actively conducted. DS-C
In the DMA transmission method, a plurality of users perform communication using the same frequency band, and each user is identified by a unique spreading code assigned to each user.

The DS-CDMA system includes a frequency division multiple access system (FDMA) and a time division multiple access system (TDM).
Compared with A), there are advantages such as being able to increase the subscriber capacity per the same frequency band, and being suitable for high-speed signal transmission because the information signal is spread and transmitted over a wide band.

In a mobile communication environment, it is rare that a base station and a mobile station are in line of sight, and a multipath is generally formed. As a result, the received signal undergoes Rayleigh fading. In Rayleigh fading, the received amplitude has a Rayleigh distribution and the phase has a uniform distribution. In order to perform synchronous detection with higher efficiency as compared with differential detection, it is necessary for the receiver to estimate the reception phase that changes at random. As a method of estimating the reception phase, a pilot symbol having a known pattern is inserted at a fixed period between information symbols,
There is a method of estimating the reception phase of each information symbol based on the reception phase estimated using the pilot symbols. In this case, it is necessary to insert pilot symbols at time intervals at which phase fluctuations due to fading can be regarded as substantially constant.

As a method for realizing high-speed signal transmission in the DS-CDMA system, there are (1) a method of changing a spreading factor according to a transmission information rate, and (2) a code for multiplexing a plurality of channels of a basic information rate. Multiplexing method,
There is. Here, a code multiplexing method of (2) for multiplexing a plurality of channels of the basic information rate is considered. FIG. 16 shows a conventional channel configuration for performing absolute synchronous detection for estimating the channel (amplitude and phase) using the above-mentioned pilot symbols in this method. The number of code channels (code multiplex number) is represented by N. Each code channel is 1
It is spread with a short code (SC-1,..., SC-N) having a repetition period of the information symbol period, and is called a long code (LC-Y) having a repetition period much longer than a common information symbol period. It is spread with a spreading code. The short code identifies each code channel, and the long code identifies other users in the same cell in the upstream channel and other users in the same cell in the downstream channel. FIG. 17 is a diagram showing a frame configuration in the case of one code channel transmission.

[0006]

(1) In FIG. 16, a pilot symbol is inserted into each code channel, and the pilot symbol is spread with the same spreading code as the spreading code for spreading the data symbols allocated to each code channel. , There is a disadvantage that cross-correlation occurs between the multiplexed code channels and the accuracy of channel estimation using pilot symbols deteriorates. As described above, in the conventional DS-CDMA code multiplexing method, the pilot symbols of each code channel are spread with different spreading codes. In this case, there is a disadvantage that the channel estimation accuracy is deteriorated. In particular, when the received signal power per one path is reduced in a multipath environment, this deterioration is remarkable.

(2) Also, as shown in FIG. 18, a pilot symbol is inserted into each code channel at the same position in the frame, a reception phase is estimated for each code channel, and information data is transmitted at a pilot symbol insertion period. To obtain the transfer function of the channel on the series by interpolation,
There is a disadvantage that the channel estimation accuracy is deteriorated when the fading fluctuation speed is increased. Furthermore, as for transmission power control, as shown in FIG. 19, a pilot symbol is inserted into each code channel at the same position in a frame, and pilot symbol insertion is performed using a measured value of the received signal power at this pilot symbol position. Since the transmission power control is performed periodically, there is a disadvantage that the accuracy of the transmission power control deteriorates when the fading fluctuation speed increases.

According to the present invention, a DS-CDM capable of improving channel estimation accuracy without greatly increasing the size of a transmission / reception circuit in DS-CDMA code multiplexing.
An object of the present invention is to provide an A transmission method.

Further, according to the present invention, it is possible to improve the fading tracking performance of channel estimation and transmission power control using pilot symbols without significantly increasing the scale of a transmission / reception circuit in DS-CDMA code multiplexing. It is intended to provide a transmission method.

[0010]

In order to achieve the above object, the invention according to claim 1 is a DS to which a code multiplexing system for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels. In the CDMA transmission method, for each code channel, a frame is formed by inserting a pilot symbol for channel estimation for synchronous detection between information symbols at a fixed period, and the information symbol of each code channel is unique to each code channel. Are spread with one spreading code in the orthogonal spreading code group orthogonal to each other in one information symbol period, and the pilot symbol of each code channel is included in the orthogonal spreading code group in one information symbol period unique to each code channel. Or each of the code channels in the orthogonal spreading code group of one information symbol period. Characterized by spreading a spreading code other than the spreading code assigned to the information symbols Le.

According to a second aspect of the present invention, there is provided a DS-CDM to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels is provided.
In the A transmission method, transmission data is collectively convolutionally coded, and a convolutionally coded information data sequence is collectively periodically written for each N × X ₂ (N is the number of code channels), and Z-frames (Z Is written as a natural number), and is periodically read for every Y ₂ information data in the direction perpendicular to the writing (X ₂ and Y ₂ are:

[0012]

(Equation 2)

N × X ₂ × Y ₂ = a natural number that satisfies the total number of information data in the Z frame), and interleaving for distributing to N code channels is performed.

Further, the invention according to claim 3 is a DS-CD to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels is provided.
In the MA transmission method, for each code channel, when a frame is formed by inserting pilot symbols for channel estimation for coherent detection between information symbols at a fixed period, N code channels (N: multiplex code) The number of channels, N = H × K, is divided into K blocks (K: the number of blocks) by H (H: the number of code channels in a block), and the H code channels in the same block are the same in the frame. The pilot symbols are inserted in the positions, and for the code channels in the K blocks, the pilot symbols for each block are such that the spacing between the closest pilot symbols for all pilot symbols in the different K blocks is always uniform. It is characterized by different insertion positions.

Further, the invention according to claim 4 is a DS-CD to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels is provided.
In the MA transmission method, at the time of channel estimation using pilot symbols for synchronous detection, the pilot symbols inserted between information symbols according to the pilot symbol insertion pattern of a block to which each code channel belongs in each code channel according to claim 3. The channel estimation at the pilot symbol position of each block is obtained by obtaining the channel estimation value at the pilot symbol position in each code channel, and averaging the channel estimation values of the H code channels belonging to the block for each block. By using the channel estimation value at the pilot symbol position of each block in common for all code channels, the information data is obtained at the pilot symbol insertion period of all pilot symbols inserted in all code channels. And obtaining by interpolation transmission of the channels on the line.

Further, the invention according to claim 5 is a DS-CD to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels is provided.
In the MA transmission method, when measuring the received signal power for performing transmission power control, a pilot symbol inserted between information symbols is used in each code channel according to a pilot symbol insertion pattern of a block to which each code channel belongs. Measurement of the received signal power of each code channel, and averaging the measured values of the received signal power of each code channel belonging to that block for each block to obtain the measured value of the received signal power at the pilot symbol position of each block. , And the measured value of the received signal power at the pilot symbol position of each block is used in common for all code channels, so that the transmission power control is performed at the pilot symbol insertion period of all pilot symbols inserted in all code channels. Is performed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 (corresponding to Embodiment 1) FIG. 1 shows an example of the channel configuration of the DS-CDMA transmission system of the present invention. 1 frame pilot symbols as shown in Figure 1 of the code channels of the basic transmission rate f _b,
A wideband signal is generated by multiplying this information rate by a spreading gain. By multiplexing this basic channel with N codes, if the quality is equivalent to that of the basic channel, N
It is possible to transmit information of a transmission rate of × f _b bps. In this case, the cross-correlation between the code channels can be removed by spreading the pilot symbol portion with a common spreading code among the N code channels. In multi-code multiplex transmission, pilot symbols can be shared because each code channel receives the same fading. FIG. 2 shows a channel configuration in the case of transmitting pilot symbols only for one code channel, unlike FIG.

Embodiment 2 (corresponding to Embodiment 2) FIG. 11 shows another example of the channel configuration of the DS-CDMA transmission system of the present invention. 1 frame of the code channels of the basic transmission rate f _b is the pilot symbol as shown in FIG. 11, consists of information data to generate a wideband signal this information rate spread gain multiplying by. Let this basic channel be N
By code multiplexing, information of a transmission rate of N × f _b bps can be transmitted if the quality is equivalent to that of the basic channel. Here, the configuration of N code channels (N: the number of multiplexed code channels, N = H × K) is such that the N code channels are divided into K blocks (H: H: the number of code channels in a block) by K blocks (K: (The number of blocks), and for H code channels in the same block, pilot symbols are inserted at the same position in the frame. For K code channels, all code channels in different K blocks are used. For each of the pilot symbols, a frame having a different pilot symbol insertion position is used for each block so that the interval between the closest pilot symbols is always uniform.

[0019]

Embodiment 1 FIG. 3 shows the configuration of an error correction coding unit in multicode multiplex transmission. The input information data is encoded by the outer code encoder 1 using an outer code of double error correction coding,
Interleave processing is performed by the interleaver 2, and the data is distributed to N code channels by the serial-parallel conversion unit 3.
Then, convolutional coding by the convolutional encoder 4 and interleaving by the interleaver 5 are performed for each code channel. FIG. 9A shows an interleaving method of the DS-CDMA transmission scheme. All the information data in the Z frames, write each X ₁ data for each code channel,
Reading is carried out in the write direction perpendicular to each _{Y 1} data _{(X 1} and _{Y 1,}

[0020]

(Equation 3)

N × X ₁ × Y ₁ = natural number that satisfies the total number of information data in the Z frame.

FIG. 4 shows the configuration of the error correction coding unit of the transmission unit of the DS-CDMA transmission system. As in FIG. 3, the input information data is encoded by the outer code encoder 6 using the outer code of the double error correction coding, interleaved by the interleaver 7, and output. This output data is collectively convolutionally encoded by the convolutional encoder 8,
The information sequence convolutionally coded by the interleaver 9 is interleaved collectively. FIG. 10A shows an interleaving method of the DS-CDMA transmission method of this example. A convolutionally encoded information data sequence is represented by N × X ₂
Periodically writing, Z after writing all the information data between frames, periodically read the writing and the direction perpendicular to each Y ₂ information data (X ₂ and Y ₂ each,

[0023]

(Equation 4)

N × X ₂ × Y ₂ = natural number that satisfies the total number of information data in the Z frame.

Then, the information data after the interleaving is distributed to the N code channels in the serial / parallel conversion unit 10.

FIG. 5 shows a block configuration of a transmission section of the DS-CDMA transmission system. In each frame configuration unit 11,
Pilot symbols for channel estimation for synchronous detection are inserted into the coded information data of each code channel shown in FIGS. 3 and 4 at a fixed period (if necessary, pilot symbols are inserted into only one code channel). Next, the modulator 12 modulates the data. A modulation data symbol of each code channel from each modulator 12 is spread by a spreading code

[0027]

(Equation 5)

The information symbols are spread by the spreading code (SC-P × LC-Y, SC) for each code channel.
(P: 1 to N)). And adder 1
In step 4, the spread signal of each code channel is added and transmitted.

FIG. 6 shows a block configuration of a receiving section of the DS-CDMA transmission system. The received spread-spectrum modulated signal is commonly input to each matched filter 15-0,... 15-N corresponding to each spread code. Pilot symbols in the received signal are spread codes

[0030]

(Equation 6)

Is despread by a matched filter 15-0 as a spreading code replica, and the pilot symbol part channel estimating part 16 averages over several pilot symbols using the output from the frame synchronizing part 17 to obtain the received phase in the pilot symbol. Is estimated. From the estimated value, the information symbol part channel estimator 18 obtains the reception phase fluctuation at each information symbol position by interpolation. Since each code channel in the received signal receives the same fading fluctuation, the estimated phase fluctuation in each information symbol is used in common for each code channel. On the other hand, the information symbols of each code channel are spread codes for each code channel.

[0032]

(Equation 7)

Each of the matched filters 15-1 to 15-N is despread as a spreading code replica. The channel compensator 19 compensates for the despread information symbol of each code channel using the signal from the information symbol part channel estimator 18 using the pilot symbol to estimate the received phase variation. In the configuration corresponding to the multipath, the phase estimation / compensation units (17, 18, and 18) using N code channel pilot channels as shown in FIG.
19) is used for the number of multipaths to be combined. Each information symbol of each path from the channel compensator 19, which has compensated for this fading phase variation, is added by the RAKE combiner 20 using the estimated reception complex envelope of each path as a weight, and the RAK
E is synthesized.

The RAKE-combined signal is shown in FIGS.
Is input to the error correction decoding unit shown in FIG.

FIG. 7 shows an example of the configuration of the error correction decoding section of the DS-CDMA transmission system. The signal after RAKE combining is deinterleaved by a deinterleaver 21 for each code channel. FIG. 9B shows a deinterleaving method of the DS-CDMA transmission method. Writing and reading are performed in the reverse direction to the interleaving method of FIG. The deinterleaved signal is decoded by the Viterbi decoder 22 for each code channel. The decoded data of each code channel is output after the deinterleaver 24 and the outer code decoder 25 deinterleave and decode the outer code after the parallel / serial conversion by the parallel / serial converter 23.

FIG. 8 shows another example of the configuration of the error correction decoder of the DS-CDMA transmission system. The signals of the N code channels after the RAKE combining are parallel-serial-converted by the parallel-serial conversion unit 26, and are collectively deinterleaved by the deinterleaver 27. FIG. 10B shows a deinterleaving method of the DS-CDMA transmission method of this example. Writing and reading are performed in the reverse direction to the interleaving method of FIG.
The deinterleaved signals are decoded by the Viterbi decoder 28 collectively. Then, it is output after the deinterleaver 29 and the outer code decoder 30 further deinterleave and decode the outer code.

Embodiment 2 In this embodiment as well, the input information data is subjected to error correction coding using the error correction coding unit shown in FIG. 3 (interleaving is also performed using FIG. 9A).

FIG. 14 shows a block configuration of a transmission section of the DS-CDMA transmission system. In the frame forming unit 31,
In accordance with the pilot symbol insertion pattern of the block to which each code channel belongs, pilot symbols for channel estimation for synchronous detection are inserted at regular intervals into the encoded information data of each code channel from the circuit shown in FIG.
Modulation is performed by the modulator 32. A modulation data symbol of each code channel from the modulator 32 is output to a spreading modulator 33 by a spreading code for each code channel.

[0039]

(Equation 8)

The spread signal of each code channel is added in an adder 34 and transmitted.

FIG. 15 shows a block configuration of a receiving section of the DS-CDMA transmission system. The received spread modulation signal is commonly input to each matched filter 35 corresponding to each spread code. The pilot symbols and information symbols of each code channel are spread codes for each code channel.

[0042]

(Equation 9)

Each of the matched filters 35 despreads the spread code replica. In each code channel, a demultiplexer (DEMUX) 36 separates pilot symbols inserted at different positions for each block from information symbols. Since each code channel receives the same fading fluctuation, the pilot symbol part channel estimating part 37 outputs the pilot symbol from each demultiplexer 36 to the frame synchronizing part 38 which has detected the synchronization based on the output of the matched filter 35. By averaging among several pilot symbols for each code channel using the output of each to estimate the reception phase in the pilot symbol and averaging the estimated value of the reception phase of each code channel belonging to that block for each block,
An estimated value of the received phase at the pilot symbol position of each block is obtained. As shown in FIG. 12, the information symbol part channel estimator 39 uses the estimated value of the reception phase at the pilot symbol position of each block in common for all code channels, thereby The transfer function of the channel on the information data sequence can be obtained by interpolation at the pilot symbol insertion period by the pilot symbol of, and the interval of interpolation in the channel estimation is shortened. can do. Each channel compensator 40 compensates for the received phase fluctuation estimated using the pilot symbol by using the signal from the information symbol part channel estimator 39 for each information symbol of each code channel obtained from each demultiplexer 36. do.

Regarding the transmission power control, the received signal power measuring section 41 measures the received signal power at the pilot symbol position for each code channel based on the signal from the pilot symbol section channel estimating section 37. A measured value of the received signal power (SIR) at the pilot symbol position of each block is obtained by averaging the measured values of the received signal power of each code channel belonging to the block for each block. The transmission power control signal generator 42 generates a transmission power control signal (TPC) based on the measured value. As shown in FIG. 13, by using the measured value of the received signal power at the pilot symbol position of each block in common for all code channels, the pilot symbol insertion period for all pilot symbols inserted in all code channels , Transmission power control can be performed, and the transmission power control cycle can be virtually shortened, so that fading tracking performance of transmission power control can be improved.

In a configuration corresponding to multipath, the number of phase estimation / compensation units (37, 38, 39, 40) using N code channel pilot channels as shown in FIG. Each information symbol of each path from the channel compensator 40 compensated for the fading phase variation is added by each RAKE combiner 43 using the estimated reception complex envelope of each path as a weight.
E is synthesized. The RAKE-combined signal is input to the error correction decoding unit shown in FIG. The operation and deinterleaving method (FIG. 9) are the same as those in the first embodiment.

[0046]

As described above, according to the present invention, in CDMA multiplexing for high-speed signal transmission, a common spreading code for spreading pilot symbols in a plurality of code channels is used for each code channel. Removes the cross-correlation between pilot symbols of each code channel as compared with a conventional method using a spreading code for spreading information data of each code channel as a spreading code for spreading pilot symbols of each code channel. Channel estimation accuracy using pilot symbols can be improved.

Further, according to the present invention, in CDMA multiplexing for high-speed signal transmission, a plurality of code channels are divided into several blocks, and a frame in which a pilot symbol insertion position is different for each block is used. Compared with the conventional method in which the insertion positions of the pilot symbols in the channels are all the same, the reception phase estimation value obtained by the pilot symbols of the other code channels belonging to other blocks is also different from the reception phase fluctuation of the information symbols of the information symbols of each code channel. Since it can be used for compensation, the transfer function of the channel on the information data sequence can be obtained by interpolation in the pilot symbol insertion period of all pilot symbols inserted in all code channels, and interpolation in channel estimation Because the interpolation interval becomes shorter, It is possible to improve the fading follow-up of the channel estimation. In addition, by using the measured value of the received signal power at the pilot symbol position of another block in common for all code channels, transmission power control is performed in a pilot symbol insertion cycle of all pilot symbols inserted in all code channels. Since the transmission power control cycle can be virtually reduced, the fading tracking performance of the transmission power control can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a channel configuration of a DS-CDMA transmission system according to the present invention.

FIG. 2 is a diagram showing another example of the channel configuration of the DS-CDMA transmission system of the present invention.

FIG. 3 is a diagram illustrating an example of an embodiment configuration of an error correction encoding unit of the DS-CDMA transmission system according to the present invention.

FIG. 4 is a diagram illustrating another example of the configuration of the embodiment of the error correction encoding unit of the DS-CDMA transmission system according to the present invention.

FIG. 5 is a diagram illustrating an example of a configuration of an embodiment of a transmission unit of the DS-CDMA transmission system according to the present invention.

FIG. 6 is a diagram illustrating an example of a configuration of an embodiment of a receiving unit of the DS-CDMA transmission system according to the present invention.

FIG. 7 is a diagram illustrating an example of an embodiment configuration of an error correction decoding unit of the DS-CDMA transmission system according to the present invention.

FIG. 8 is a diagram showing another example of the configuration of the embodiment of the error correction decoding unit of the DS-CDMA transmission system according to the present invention.

FIG. 9 is a diagram illustrating an example of an embodiment configuration of an interleaving unit of the DS-CDMA transmission system according to the present invention.

FIG. 10 is a diagram showing another example of the configuration of the embodiment of the interleaving unit of the DS-CDMA transmission system of the present invention.

FIG. 11 is a diagram showing another example of the channel configuration of the DS-CDMA transmission system of the present invention.

FIG. 12 is a diagram showing a channel estimation method (when K = 2) of the DS-CDMA transmission system of the present invention.

FIG. 13 is a diagram illustrating transmission power control timing (when K = 2) of the DS-CDMA transmission method according to the present invention.

FIG. 14 is a diagram showing another example of the configuration of the embodiment of the transmission unit of the DS-CDMA transmission system according to the present invention.

FIG. 15 is a diagram showing another example of the configuration of the embodiment of the receiving unit of the DS-CDMA transmission system according to the present invention.

FIG. 16 is a diagram illustrating a conventional code multiplexing method.

FIG. 17 is a diagram illustrating a frame configuration in the case of one code channel transmission.

FIG. 18 is a diagram illustrating a conventional channel estimation method.

FIG. 19 is a diagram showing conventional transmission power control timing.

[Explanation of symbols]

 11 Frame Configuration Unit 12 Modulator 13 Spreading Modulator 14 Adder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukihiko Okumura 2-10-1 Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Corporation (72) Inventor Shinji Kamibayashi Toranomonji, Minato-ku, Tokyo (No. 10-1-1, NTT Mobile Communication Network Co., Ltd.) (72) Inventor Koji Ono 2-1-1, Toranomon, Minato-ku, Tokyo F-Term (NT Reference Mobile Communication Network Co., Ltd.) 5K022 EE01 EE21 EE31 5K067 AA02 CC10 DD27 EE02 EE10 EE72 FF16 GG09

Claims (5)

[Claims] 1. A DS-CDMA transmission method to which a code multiplexing method for code-multiplexing a plurality of code channels to generate a high-speed transmission channel and transmit a signal is applied, wherein a channel estimation for synchronous detection is performed for each code channel. A frame is formed by inserting pilot symbols for each of the information symbols at a constant period between the information symbols, and the information symbol of each code channel is one of a group of orthogonal spreading codes orthogonal to each other in one information symbol period unique to each code channel. A pilot symbol of each code channel is spread by a spreading code, and one of the orthogonal spreading codes of the one information symbol period unique to each code channel or one of the orthogonal spreading codes of the one information symbol period is used. A spreading code other than the spreading code assigned to the information symbol of each code channel of DS-CDMA transmission method characterized by dispersed. 2. A DS-CDMA transmission method to which a code multiplexing method for code-multiplexing a plurality of code channels to generate a high-speed transmission channel and transmit a signal is applied. After writing all the information data sequences in a batch at regular intervals of N × X ₂ (N is the number of code channels), and after writing all information data between Z frames (Z is a natural number), in the direction perpendicular to the writing. Is periodically read out for each Y ₂ information data (X ₂ and Y ₂ are given by: N × X ₂ × Y ₂ = a natural number that satisfies the total number of information data in the Z frame), and performs interleaving for distributing to N code channels. 3. A DS-CDMA transmission method to which a code multiplexing method for code-multiplexing a plurality of code channels to generate a high-speed transmission channel and transmit a signal is applied, wherein a channel estimation for synchronous detection is performed for each code channel. When a frame is configured by inserting pilot symbols for information symbols at regular intervals between information symbols, N code channels (N: number of multiplexed code channels, N
= H × K) is divided into K blocks (K: the number of blocks) by H (H: the number of code channels in a block). For H code channels in the same block, pilot symbols are placed at the same position in the frame. For the code channels in the K blocks, if the pilot symbol insertion positions are different for each block so that the interval between the closest pilot symbols is always uniform for all pilot symbols in the different K blocks, And a DS-CDMA transmission method. 4. In a DS-CDMA transmission method to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels, a channel estimation using pilot symbols for synchronous detection is performed. A channel estimation value at a pilot symbol position in each code channel is obtained by using a pilot symbol inserted between information symbols according to a pilot symbol insertion pattern of a block to which each code channel belongs in each code channel of claim 3. A channel estimation value at the pilot symbol position of each block is obtained by averaging the channel estimation values of the H code channels belonging to the block for each block. All code channels By using in common in,
A DS-CDMA transmission method, wherein a transmission relationship of a channel on an information data sequence is obtained by interpolation in a pilot symbol insertion period of all pilot symbols inserted in all code channels. 5. In a DS-CDMA transmission method to which a code multiplexing method for transmitting a signal by generating a high-speed transmission channel by code-multiplexing a plurality of code channels, measuring received signal power for performing transmission power control. At this time, in each code channel of claim 3, the received signal power of each code channel is measured using pilot symbols inserted between information symbols according to the pilot symbol insertion pattern of the block to which each code channel belongs. The measured value of the received signal power of each code channel belonging to the block is averaged to obtain the measured value of the received signal power at the pilot symbol position of each block, and the measurement of the received signal power at the pilot symbol position of each block is performed. By using the values in common for all code channels, DS-CDMA transmission method characterized by controlling the transmission power in the pilot symbol insertion cycle by all pilot symbols inserted into the channel.