JP2000115015A - Transmitter power control method of radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the influence of a transient phenomenon when a transmitter power is varied on data discrimination precision and reception quality. SOLUTION: For CDMA(code-division multiple access) mobile communication, a transmission part performs transmitter power control (including a transient phenomenon) at (1) a transmit signal part (transmit data part DT) which is encoded for error correction, (2) a transmit signal part where reception quality is not measured, or (3) a transmit signal part (dummy bit insertion part) where transmit data need not be discriminated and decided. A pilot symbol P and a TPC bit T have neither phase rotation nor level variation in the case of, e.g. (1). The transmit data DT has errors resulting from phase rotation and level variation under sending power control, but the data errors can be corrected by a reception-side error correcting circuit and the influence of transmission-side transmitter power control over reception-side data discrimination precision and reception quality can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control method for a radio apparatus, and more particularly to a transmission power control method for a radio apparatus capable of controlling transmission power without adversely affecting communication quality.

[0002]

2. Description of the Related Art DS-CDMA (Direct S-CDMA) is a next-generation mobile communication system that realizes wireless multimedia communication.
2. Description of the Related Art A digital cellular radio communication system using an equence Code Division Multiple Access (direct spreading code division multiple access) technique is being developed. In such a CDMA digital cellular radio communication system, a base station multiplexes control information and user information with a spreading code and transmits the spread information, and each mobile station spreads and transmits information using a spreading code specified by the base station.

FIG. 24 is a block diagram of a receiving section of a CDMA mobile station. 1 is an antenna, 2 is a receiving circuit, and performs an amplification operation and a frequency conversion operation from RF to IF. What is performed, 3 is a QPSK quadrature detection section that performs QPSK quadrature detection and outputs I and Q signals, 4 is an AD converter that converts baseband analog I and Q signals that are detection outputs into digital, and 5 is an AD converter output A despreading circuit for despreading the I and Q data, 6 a data demodulation unit for performing synchronous detection, data determination, error correction, etc., and 7 a despreading start timing (phase of a received spread code). A reference numeral 8 denotes a timing determining unit for identifying the despreading start timing (phase) from the correlation value. In the data demodulation unit 6, 6a is a synchronous detection unit that receives the despread signals (I and Q signals) and performs synchronous detection, 6b is an error correction unit that performs error correction processing on demodulated received data, and 6c is data identification. Department.

The correlator 7 is composed of, for example, a matched filter, shifts the phase of a known reference spreading code sequence (the same spreading code sequence as that on the base station side), and shifts the phase of the reference spreading code sequence for each phase shift. The correlation value with the received spread data sequence is calculated to calculate the correlation value. The timing determining unit 8 monitors whether the correlation value calculated by the correlator 7 has exceeded the set level, determines the despread start timing (phase) based on the timing when the correlation value has exceeded the set level, and sends the result to the despreading circuit 5. input.

A synchronous detector 6a of the data demodulator 6 detects a pilot symbol included in the received signal, obtains a phase difference between the pilot symbol and a known pilot symbol, and obtains the phase difference and the despread I, This is to restore the phase of the Q signal. In CDMA communication, the transmitting side inserts a new pilot at the beginning of a frame and arranges data after the pilot symbol. The transmitting side sorts the frame data sequence into I and Q data sequences, performs spreading modulation on each of them, and then performs QPSK modulation and transmits. Therefore, the data and pilot are I, Q, respectively.
Form a symbol with the two bits of
Expressed in the IQ complex plane, I + jQ = (I ² + Q ² ) ^1/2 exp (jθ). The data symbol and the pilot symbol undergo phase rotation by transmission, but if the signal point position vector P _ACT (see FIG. 25) is known on the receiving side, the ideal signal point position vector P _IDL of the pilot symbol is known. The phase rotation angle θ of the symbol is obtained.
Therefore, the synchronous detector 6a detects the pilot symbol, calculates the phase rotation angle θ thereof, performs a rotation process for the data symbol by the rotation angle −θ, restores the data symbol to the original, and returns “1”, “0” of the received data. Is determined. This enables highly accurate data demodulation.

Necessity of transmission power control By the way, focusing on a certain mobile station, a signal output from another mobile station becomes an interference wave, and communication becomes impossible if the signal strength output from another mobile station is high. . Similarly, a signal output from a certain mobile station becomes an interference wave with respect to another mobile station, and if the signal strength is high, other mobile stations cannot communicate. For this reason, transmission power control is required, and each station transmits transmission power to the partner station using TPC bits (transmission power control data) based on reception quality such as the ratio of received signal power to interference wave power (S / I ratio). The transmission power is controlled based on the instruction by the TPC bit from the partner station.

Configuration of Transmission Power Control FIG. 26 is a configuration diagram of a main part of a portion related to transmission power control of a CDMA station. In FIG. 26, a transmission data generation unit 11 generates two sequences of transmission data strings a ₁ and a ₂ from pilot bits, TPC bits, and data bits in accordance with a physical channel format. That is, the data is 1
In-phase components (I component: In
-Phase compornent) and quadrature component (Q component: Quadratureco)
mpornent) and input to the transmission data generation unit 11. The transmission data generation unit 11 adds a pilot bit and a TPC bit to each of the two sequences (I channel, Q channel).
The transmission data strings a ₁ and a ₂ of the (channel) are output.

[0008] Reference numerals 12 ₁ and 12 ₂ denote spreading sections for spreading the _two transmission data strings a ₁ and a ₂ using a spreading code of a chip frequency, and reference numerals 13 ₁ and 13 ₂ denote waveform shaping filters constituted by FIR filters. And a signal delay of a time corresponding to the number of taps occurs. 14 ₁ and 14 ₂ are DA converters for converting the output of each filter from DA to output, 15 is a quadrature modulator for orthogonally modulating spread signals of I and Q sequences, and 16 is a transmitter (T
In x), the quadrature-modulated signal is up-converted to a transmission frequency and transmitted at a predetermined transmission power. The quadrature modulator 15 has multipliers 15a and 15b for multiplying the I-channel signal and the Q-channel signal by carrier waves (sin waves and cos waves) and a hybrid 13c for combining and outputting the multiplication results. The transmission unit 16 has a variable attenuator 16a that varies the degree of attenuation based on the transmission power control voltage b, in addition to the frequency converter and the power amplifier. Reference numeral 17 denotes a transmission unit timing generation circuit, which transmits a transmission data sequence a based on a signal SH indicating a frame head timing of a reception signal from a partner station.
A latch circuit 18 for generating a control signal A indicating the generation timing of ₁ and a ₂ and a control signal B indicating a transmission power change timing, and 18 is a latch circuit for changing the transmission power at the timing of the control signal B, and a transmission power control unit ( A control voltage b corresponding to the power instructed by the controller (not shown) is generated at the timing of the control signal B and is input to the transmitter 16a to control the transmission power.

Timing Generation Circuit FIG. 27 is a block diagram of a conventional timing generation circuit 17, in which a signal SH indicating the head timing of a received signal frame is shown.
First pulse F delayed by time t ₁ from the occurrence time of
The first delay circuit 17a, the second delay circuit 17b for outputting a control signal B to a transmission power control timing to the timing obtained by further time t ₂ delayed from the time of occurrence of the frame head pulse FH for generating H, frame head pulse FH And a third delay circuit 17c for outputting a control signal A indicating the generation timing of transmission data strings a ₁ and a ₂ based on the number of pilot bits and the number of TPC bits, and a _first for setting a delay time t ₁ delay time setting unit 17d, and a second delay time setting unit 17e for setting the delay time t _2.

FIG. 28 is a timing chart showing a conventional transmission power control method. The frame of the received signal S _R is composed of pilot symbols P, TPC bits T, and data bits DT, and the pilot symbols are arranged at the head of the frame. The pilot symbol P is a bit sequence for performing channel estimation for synchronous detection, and the TPC bit is a signal for instructing a change in transmission power. A frame head pulse FH is generated at a time delayed by time t ₁ from the generation time of the reception frame head timing signal SH, and a control signal A (A, B, C) is generated based on the frame head pulse FH. Time t ₂ more than the first pulse FH
At a delayed time, a control signal B for determining the transmission power control timing is generated. Frame head pulse FH of generation time (i.e., delay time t _1), the first frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time is determined to match. Control signal B
Time of occurrence, i.e., the delay time t ₂ is the transmitted signal is determined to match the frame head of S _T, transmission power control is adapted to start with the frame head of the transmission signal.

Transmission power control At the time of transmission power control, a transmission power control unit (not shown) checks a TPC bit T of a reception signal S _R from a partner station, and the TPC bit T indicates an increase in transmission power. If so, the control voltage a is increased by a set amount, and if it is an instruction to reduce the transmission power, the control voltage a is decreased by a set amount (FIG. 28), and the control voltage a is latched by the latch circuit 18 (FIG. 28). To enter. Latch circuit 18 in synchronism with the rise of the control signal B outputted from the timing generating circuit 17, i.e., to change the control voltage b in the frame head of the transmission signal S _T, is input to the control terminal of the variable attenuator 16a. As a result, the transmission unit 16 changes the transmission power P of the transmission signal. On the other hand, TPC bit generating section for determining a TPC bit to put the transmission signal S _T (not shown) measures the reception quality (S / I ratio) using a portion or all of the received signal S _R, then the measurement The received reception quality is compared with the reference value, and if the reception quality is good, a TPC bit for lowering the transmission power is created and output to the transmission data generation unit 11, and conversely, if the reception quality is bad, a TPC bit for increasing the transmission power is created. And output.

The transmission data generation unit 11 generates a pilot symbol P, a TPC bit T, a transmission data D for each frame based on a transmission data generation timing (control signal A).
T are arranged in order, and an I channel data string a ₁ and a Q channel data string a ₂ are output. These I-channel data sequence a _1, Q channel data stream a ₂ are hereinafter diffusion processing, the waveform shaping filter processing is subjected to QPSK quadrature modulation, and inputs to the transmitter 16 is the transmission signal S _T. Transmitter 16 transmits by performing the above-described transmission power control on the transmission signal S _T.

[0013]

The transmission power control has a transient phenomenon, and the transmission power does not change instantaneously but changes gradually. The transient phenomena are (1) the transmission spectrum is widened when the transmission power fluctuates sharply, so that the power fluctuation is not steep. (2) A noise removing capacitor attached to the control terminal of the variable attenuator 16a. The rise of the transmission power does not become steep due to the stray capacitance or the stray capacitance. By the way, if the transmission power is changed and controlled independently of the modulation waveform, the modulation waveform is distorted. In the conventional transmission power control, the transmission power fluctuates during the pilot symbol period due to transient phenomena, causing phase rotation and level fluctuation of the pilot symbol, deteriorating its quality, adversely affecting the characteristics of synchronous detection, and identifying data. Decrease accuracy.
Also, the measurement of the reception quality becomes inaccurate, and correct transmission power control cannot be performed. Accordingly, an object of the present invention is to reduce the influence of a transient phenomenon at the time of transmission power change on data identification accuracy and reception quality.

[0014]

According to the present invention, the above objects can be achieved by: (1) measuring the reception quality during the period of a transmission signal portion which is coded for error correction; This is achieved by performing transmission power control (including transient phenomena) during the period of no transmission signal portion or (3) during the period of transmission signal portion that does not require identification of transmission data. In this case, the change timing of the transmission power is randomly switched within the period of the transmission signal portion,
Alternatively, switch regularly. If transmission power control is performed during a transmission signal portion (transmission data portion) where error correction encoding is performed as in (1), phase rotation and level fluctuation occur in pilot symbols (pilot bits) and TPC bits. You can not. On the other hand, although errors occur due to phase rotation and level fluctuation due to transmission power control in transmission data, data errors can be corrected by an error correction circuit on the receiving side, and the influence of transmission power control on data identification accuracy and reception quality can be reduced. .

If the transmission power control is performed during the period of the transmission signal portion where the reception quality is not measured as in (2), the reception quality degradation is not defined because the portion is not defined to perform the reception quality measurement. Will not occur. If the transmission power control is performed during the period of the transmission signal portion (dummy bit portion) that does not require the transmission data identification determination as in (3), it is possible to prevent the phase rotation and level fluctuation from occurring in the pilot symbols and the TPC bits. . On the other hand, errors occur due to phase rotation and level fluctuation due to transmission power control in dummy bits,
Since identification determination is not required, data may be erroneous, so that the influence of transmission power control can be eliminated. or,
According to the present invention, the above problem is achieved by (1) making the beginning of a frame a portion where error correction encoding is performed, or (2)
Make the beginning of the frame a part where reception quality is not measured,
This is achieved by changing the transmission power at the beginning of the frame. Even in this case, the pilot symbol and TP
It is possible to prevent phase rotation and level fluctuation from occurring in the C bit. On the other hand, although errors occur due to phase rotation and level fluctuations due to transmission power control in transmission data, data errors can be corrected by an error correction circuit on the receiving side, so that the influence of transmission power control can be reduced.

Further, according to the present invention, the above object is achieved by changing the transmission power at a stage prior to the waveform shaping filter. The output of the waveform shaping filter (FIR filter) is obtained by synthesizing a response (impulse response) to each impulse of the input impulse train. If the magnitude of the impulse input to this filter is made larger or smaller than the beginning of the frame by the transmission power control amount, it is possible to prevent the phase rotation and level fluctuation from occurring in the filter output signal, and to improve the data identification accuracy and the transmission power control. Deterioration of reception quality can be prevented.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) First Embodiment (a) Outline FIG. 1 is a schematic explanatory diagram of a first embodiment of the present invention, where _ST is a transmission signal. The frame of the transmission signal is composed of pilot symbols P, TPC bits T, and data DT, and the pilot symbols are arranged at the head of the frame. Data DT has been subjected to an encoding process for error correction, and pilot symbols P and TPC bits T have not been subjected to an encoding process for error correction. In the first embodiment, transmission power control including a transient phenomenon is performed in a period T of a signal portion (a period of data DT) in which an encoding process for error correction is performed. By doing so, it is possible to prevent phase rotation and level fluctuation from occurring in pilot symbols and TPC bits. On the other hand, errors occur due to phase rotation and level fluctuation due to transmission power control in the transmission data, but the data error can be corrected by the error correction circuit on the reception side, and the transmission power control on the transmission side reduces the data identification accuracy and reception quality on the reception side. Impact on the vehicle can be reduced.

(B) Configuration of Transmission Power Control FIG. 2 focuses on a portion related to transmission power control of the present invention.
FIG. 26 is an overall view of a CDMA station, and the configuration of 11 to 17 is the same as the configuration of the main part of the related art shown in FIG. In the figure, reference numeral 11 denotes a transmission data generation unit, which comprises two sequences of transmission data strings a ₁ and a 2 according to a physical channel format from pilot bits (pilot symbols), TPC bits, and transmission data bits.
to generate a _2. The transmission data is distributed alternately one bit at a time, and the in-phase component (I component: In-Phase compornent)
And a quadrature component (Q component: Quadrature compornent), which are input to the transmission data generation unit 11, which adds a pilot bit and a TPC bit to each of the two sequences (I and Q channels). Transmission data string a of
_1, and outputs the a _2.

Reference numeral 12 denotes a spreading unit for spreading each of the _two transmission data strings a ₁ and a ₂ using a predetermined spreading code. Reference numeral 13 denotes an FIR which performs waveform shaping processing on each of the I and Q channels.
A waveform shaping filter having a filter configuration, 14 a DA converter for DA-converting each filter output, 15 a quadrature modulator for quadrature modulating spread signals of I and Q sequences, 16 a quadrature modulated signal up to a predetermined transmission frequency A transmitting unit (Tx) that converts and transmits at a predetermined transmission power;
It has a variable attenuator 16a for transmission power control. 17
Is a transmission unit timing generation circuit, and a control signal A indicating the generation timing of the transmission data strings a ₁ and a ₂ based on the signal SH indicating the frame start timing of the reception signal from the partner station.
And a control signal B indicating the transmission power change timing. Reference numeral 18 denotes a latch circuit that changes the transmission power at the timing of the control signal B, and generates a control voltage a corresponding to the power specified by the transmission power control unit 25 (described later) as the control voltage b at the timing of the control signal B. Variable attenuator 1
Input to the control terminal 6a to control the transmission power.

An antenna 21 transmits a transmission signal to a partner station and receives a signal from the partner station. An antenna 22 converts a received signal into an IF frequency and outputs power suitable for processing such as quadrature demodulation, despreading, and detection. A quadrature demodulator for demodulating an IF signal to demodulate it into baseband I and Q signals; a despreading unit for performing despreading processing on I and Q signals; It is a detection unit that outputs demodulated bits (data bits) and TCP bits demodulated by detection.
The despreading unit 24 corresponds to the AD converter 4, the despreading circuit 5, the correlator 7, and the timing determination unit 8 in FIG. Reference numeral 26 denotes a transmission power control unit which outputs a control voltage a of the initial power based on the initial transmission power value at the initial stage, and a control voltage corresponding to the transmission power indicated by the TCP bit input from the detection unit 25 at the time of use. a is output. 27 is TP
The C bit generation unit measures the reception quality (for example, S / I ratio) of the demodulated bits output from the detection unit 25, and generates TPC bits to be transmitted based on the reception quality. 28, a reception timing detection unit for detecting the head of a frame of a reception signal;
Reference numeral 9 denotes a reference timing generator, which averages the head timings of the frames detected by the reception timing detector, generates a reference signal (received frame head timing signal SH) synchronized with the received signal, and generates a transmitter timing generator 17.
To enter.

FIG. 3 shows a timing generation circuit 1 according to the first embodiment.
7, a first delay circuit 31 ₁ for generating a frame start pulse FH delayed by time t ₁ from the generation time of the signal SH indicating the start timing of the received signal frame;
31 ₂ is a second delay circuit that outputs a control signal B whose transmission power control timing is a timing delayed by time t ₃ from the generation time of the signal SH, and 31 ₃ is a frame head pulse FH
Is input to, a third delay circuit for outputting a control signal A indicating a generation timing of the transmission data sequence a _1, a _2, based on the number and the TPC bit pilot bit, 31 ₄ to set the delay time t ₁ delay time setting unit of 1, 31 ₅ is the second delay time setting unit for setting a delay time t _3.

(C) Transmission Power Control Time Chart FIG. 4 is a timing chart showing the transmission power control method of the first embodiment. The frame of the received signal S _R is composed of pilot symbols P, TPC bits T, and data DT, and the pilot symbols are arranged at the head of the frame. Data DT has been subjected to an encoding process for error correction, and pilot symbols P and TPC bits T have not been subjected to an encoding process for error correction. Time t from the generation time of the reception frame head timing signal SH
_At the time delayed by _one , a frame head pulse FH is generated, and a control signal A is generated based on the frame head pulse FH.
(A, B, C) occur. The control signal B to determine the transmission power control timing to the time occurrence time than the time t ₃ the delayed received frame head timing signal SH is generated. Frame head pulse FH of generation time (delay time t _1), the first frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time is determined to match. Also, the time of occurrence of the control signal B (delay time t ₃₎ is determined as occurring before the frame head than the time Ta of the transmission signal S _T. However, the time Ta is longer than the time required for transmission power control (including a transient phenomenon). The bold line in the control signal B, the control voltage b and the transmission wave power P indicates the case where the transmission power control is performed according to the present invention, and the thin line indicates the case where the transmission power control is performed according to the conventional example.

(D) Transmission power control At the time of transmission power control, the transmission power control unit 26 checks the TPC bit T of the received signal S _R ,
If the command indicates an increase in the transmission power, the control voltage a is increased by a set amount. If the command indicates a decrease in the transmission power, the control voltage a is reduced by a set amount (FIG. 4). Is input to the latch circuit 18. Latch circuit 18 in synchronism with the rise of the control signal B outputted from the timing generating circuit 17, i.e., the transmission signal S frame than to change the control voltage b on the time Ta before _T, then the variable attenuators 16a of transmitter 16
Input to the control terminal. As a result, the transmission unit 16 changes the transmission power P of the transmission signal. On the other hand, TPC bit generation unit 27 that determines a TPC bit to put the transmission signal S _T
Measures the reception quality (S / I ratio) using a part or the whole of the reception signal S _R , then compares the measured reception quality with a reference value, and lowers the transmission power if the reception quality is good.
A C bit is created and output to the transmission data generation unit 11, and conversely, if the reception quality is poor, a TPC bit that increases the transmission power is created and output.

The transmission data generator 11 generates a pilot symbol P, a TPC bit T, a transmission data D for each frame based on the transmission data generation timing (control signal A).
T are arranged in order, and an I channel data string a ₁ and a Q channel data string a ₂ are output. These I-channel data sequence a _1, Q channel data stream a ₂ are hereinafter diffusion processing, the waveform shaping filter processing is subjected to QPSK quadrature modulation, and inputs to the transmitter 16 is the transmission signal S _T. Transmitter 16 transmits by performing the above-described transmission power control on the transmission signal S _T. In the first embodiment as described above, for controlling the transmission power from the previous frame beginning from the time Ta of the transmission signal S _T, terminates the transmission power control (including transient) in the previous frame start time of the transmission signal S _T it can. As a result,
Phase rotation and level fluctuation can be prevented from occurring in a signal portion (pilot symbol or TPC bit) that has not been subjected to error correction coding processing. On the other hand, an error due to phase rotation or level fluctuation due to transmission power control occurs in a signal portion (data bit) that has been subjected to error correction encoding processing, but the data error can be corrected by an error correction circuit on the receiving side. In addition, the influence of transmission power control on the transmission side on data identification accuracy and reception quality on the reception side can be reduced.

[0025] (e) another diagram 5 of the first embodiment is another configuration diagram of a timing generation circuit 17 (FIG. 2), 32 ₁ from the time of occurrence of the signal SH indicating the head timing of the received signal frame A first delay circuit for generating a frame head pulse FH delayed by time t _1, and a _second delay circuit 32 ₂ for outputting a control signal B having a timing further delayed by time t ₄ from the generation time of the frame head pulse FH as a transmission power control timing second delay circuit, 32 ₃ is input to the frame head pulse FH, the number of pilot bits and TPC
A third delay circuit 32 for outputting a control signal A indicating the generation timing of the transmission data strings a ₁ and a ₂ based on the number of bits, 32
₄ the first delay time setting unit for setting the delay time t _1, 32
₅ is a second delay time setting unit for setting a delay time t _4.

FIG. 6 is a timing chart when the transmission power is controlled using the control signal A and the control signal B generated by the timing generation circuit 17 of FIG. The frame of the received signal S _R includes a pilot symbol P, a TPC bit T,
It is composed of data DT, and a pilot symbol is arranged at the head of the frame. Data DT has been subjected to an encoding process for error correction, and pilot symbols P and TPC bits T have not been subjected to an encoding process for error correction. A frame head pulse FH is generated at a time delayed by time t ₁ from the generation time of the reception frame head timing signal SH, and a control signal A is generated based on the frame head pulse FH. Further, a control signal B for determining the transmission power control timing is generated at a time delayed by a time t ₄ from the generation time of the frame head pulse FH. The generation time (delay time t ₁ ) of the frame head pulse FH is
A transmission signal S _T generated with a predetermined time delay from the generation time
And the beginning of the frame of the received signal S _R are determined to match. Also, the generation time of the control signal B (delay time t ₄ )
It is the beginning of the data DT of the transmission signal S _T, or is determined to occur at later.

Control signal B, control voltage b and transmission wave power P
The bold line in the figure indicates the case where transmission power control is performed according to the present invention, and the thin line indicates the case where transmission power control is performed according to the conventional example. At the time of transmission power control, the transmission power control unit 26 (FIG. 2) checks the TPC bit T of the received signal S _R , and if the TPC bit T indicates an increase in transmission power, increases the control voltage a by a set amount. If the instruction is to reduce the transmission power, the control voltage a is reduced by the set amount (FIG. 6), and the control voltage a is input to the latch circuit 18. Latch circuit 1
8 in synchronization with the rising of the control signal B outputted from the timing generating circuit 17, i.e., the data D of the transmission signal S _T
The control voltage b is changed at the beginning of T, and is input to the control terminal of the variable attenuator 16a of the transmission unit 16. Thereby, the transmitting unit 1
Reference numeral 6 changes the transmission power P during the period of the transmission signal data DT.

[0028] As described above, the data DT of the transmitted signal S _T
For transmission power control from the head, it is possible to perform transmission power control (including transient) in the data period of the transmission signal S _T. As a result, a signal portion (for example, a pilot symbol or TPC
Bit) does not cause phase rotation or level fluctuation. On the other hand, an error due to phase rotation or level fluctuation due to transmission power control occurs in a signal portion (data bit) that has been subjected to error correction encoding processing, but the data error can be corrected by an error correction circuit on the receiving side. In addition, the influence of transmission power control on the transmission side on data identification accuracy and reception quality on the reception side can be reduced.

(F) First Modification In the above, the transmission power control including the transient phenomenon is performed during the period of the signal portion (data period) where the encoding process for error correction is performed. The following can also be performed. That is, when the transmission signal has a signal part for measuring the reception quality and a signal part for which the reception quality is not measured, the transmission power control is performed in a period of the signal part for which the reception quality is not measured. For example, if the reception quality is not measured in the signal portion at the end Ta of the data DT (see FIG. 4) and the reception quality is measured in other signal portions, the transmission power is measured at the same timing as shown in FIG. Control. Further, if the reception quality is not measured in the first signal part of the data DT and the reception quality is measured in the other signal parts, the transmission power can be controlled at the same timing as that shown in FIG. it can. By doing so, it is possible to prevent phase rotation and level fluctuation from occurring in pilot symbols and TPC bits. Although errors occur due to phase rotation and level fluctuations in the transmitted data, the data errors can be corrected by the error correction circuit on the receiving side, and the effect of transmission power control on the transmitting side on data identification accuracy and receiving quality on the receiving side is reduced. Can be reduced. Further, since the transmission power control is performed during the period of the transmission signal portion where the measurement of the reception quality is not performed, the accuracy of the measurement of the reception quality is not affected.

(G) Second Modification In the first embodiment, encoding processing for error correction is performed.
Transmission power control at the end or the beginning of the data DT
The data DT from the beginning to the end of the data DT.
Transmission power control can be performed at any position within the period
You. FIG. 7 shows a tie according to a second modification for performing such transmission power control.
FIG. 3 is a configuration diagram of a mining generation circuit 17 (FIG. 2);₁Is
After the time of occurrence of the reception frame head timing signal SH
Interval t₁First to generate delayed frame top pulse FH
Delay circuit, 33_TwoIs the received frame start timing signal
Any time t from the time of SH occurrence₅₆Send delayed time
A second output of a control signal B for power control timing
Delay circuit, 33 _ThreeIs the input of the frame start pulse FH.
Based on the number of pilot bits and the number of TPC bits
Transmission data string a₁, A_TwoControl signal indicating the generation timing of
A third delay circuit that outputs A, 33_FourIs the delay time t₁Set
First delay time setting unit to be set, 33 _FiveIs the time t_Five~ T₆of
Any delay time t in the range₅₆Configuration with a random number generator
This is the second delay time setting unit that has been formed.

FIG. 8 is a timing chart when the transmission power is controlled using the control signal A and the control signal B generated by the timing generation circuit 17 of FIG. The frame of the received signal S _R includes a pilot symbol P, a TPC bit T,
It is composed of data DT, and a pilot symbol P is arranged at the head of the frame. The data DT has been subjected to an encoding process for error correction, and the pilot symbol P
And TPC bit T are not subjected to an encoding process for error correction. Received frame start timing signal SH
A frame leading pulse FH is generated at a time delayed by the time t ₁ from the occurrence time of, and a control signal A (A, B, C) is generated based on the frame leading pulse FH. Further, a control signal B for determining the transmission power control timing is generated at a time delayed by an arbitrary time t ₅₆ (t ₅ ≦ t ₅₆ ≦ t ₆ ) from the generation time of the reception frame head timing signal SH. t ₅
Is the time to the beginning of the data, and t ₆ is the time from the end of the data DT to the position before the time Ta required for the transmission power control.

The frame head pulse FH of generation time (delay time t ₁₎ is determined as the top match of a frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time . The generation time (delay time t ₅₆ ) of the control signal B is arbitrarily determined so as to satisfy t ₅ ≦ t ₅₆ ≦ t ₆ . The bold line in the control signal B, the control voltage b, and the transmission wave power P indicates the case where the transmission power control is performed according to the present invention, and the thin line indicates the case where the transmission power control is performed according to the conventional example. At the time of transmission power control, the transmission power control unit 26 (FIG. 2) checks the TPC bit T of the received signal S _R , and if the TPC bit T indicates an increase in transmission power, increases the control voltage a by a set amount. If the instruction is to reduce the transmission power, the control voltage a is reduced by a set amount (FIG. 8), and the control voltage a is input to the latch circuit 18. Latch circuit 1
Reference numeral 8 changes the control voltage b at an arbitrary position in the period of the data DT according to the rise of the control signal B output from the timing generation circuit 17 and inputs the control voltage b to the control terminal of the variable attenuator 16a of the transmission unit 16. As a result, the transmission unit 16 changes the transmission power P at an arbitrary position in the data DT of the transmission signal.

That is, in the second modification, the reception signal TPC
The control voltage a is changed by a bit in a portion where error correction coding is not performed (a portion for measuring reception quality), and a delay time of the control signal B from the reception frame head timing signal SH is made random. , The timing of starting the power change is randomized. The time constant of the control voltage b and the time of the transient phenomenon of the transmission wave output are represented by the data part D
If the period is set to be sufficiently smaller than T, the power can be changed in the coded portion of the error correction in the data portion. As described above, for transmission power control at an arbitrary position within the period of the data DT of the transmission signal S _T, the coding process has not been applied signal portions for error correction (pilot symbols and TPC bits) Phase rotation and level fluctuation can be prevented from occurring. On the other hand, an error due to phase rotation or level fluctuation due to transmission power control occurs in a signal portion (data bit) that has been subjected to error correction encoding processing, but the data error can be corrected by an error correction circuit on the receiving side. In addition, the influence of transmission power control on the transmission side on data identification accuracy and reception quality on the reception side can be reduced.
Further, positions where errors easily occur in the demodulated data due to the transmission power control are randomly distributed, so that the error correction rate is improved. Note that the second modification can also be applied to the first modification. That is, the transmission power control can be performed at an arbitrary position in the period of the signal portion where the reception quality is not measured.

(H) Third Modification In the first embodiment, transmission power control is performed at the end or at the beginning of data DT that has been subjected to error correction encoding processing. In the period from the beginning to the end, a plurality of transmission power control start possible times are provided, and the transmission power control start time can be regularly switched. FIG. 9 is a configuration diagram of the timing generation circuit 17 (FIG. 2) of the third modified example for performing such transmission power control.
First delay circuit, 34 ₂ receive the frame head timing signal SH are sequentially time t ₇₁ from the time of occurrence of ₁ for generating a frame start pulse FH at the time the generated time than the time and t ₁ delay of the received frame head timing signal SH, t _{7 2} ,
- a second delay circuit for outputting a control signal B to the time when the t _7n delay the transmission power control timing, 34 ₃ is input to the frame head pulse FH, transmission data sequence based on the number of pilot bits and TPC bits a _1, a third delay circuit for outputting a control signal a indicating a generation timing of a _2, 34 ₄ the first delay time setting unit for setting the delay time t _1, 34 ₅ is the delay time t _71, t ₇₂ ,..., T _7n is a second delay time setting unit that regularly sets each frame.

FIG. 10 is a timing chart when the transmission power is controlled using the control signal A and the control signal B generated by the timing generation circuit 17 of FIG. Received signal S _R
Is composed of a pilot symbol P, TPC bits T, and data DT, and the pilot symbol P is arranged at the head of the frame. Data DT has been subjected to an encoding process for error correction, and pilot symbols P and TPC bits T have not been subjected to an encoding process for error correction. A frame head pulse FH is generated at a time delayed by time t ₁ from the generation time of the reception frame head timing signal SH, and the frame head pulse F
The control signal A is generated based on H. Further, the control signal B is regularly generated for each frame at times that are sequentially delayed by times t ₇₁ , t ₇₂ , t ₇₃ ,... T ₇ n from the generation time of the reception frame head timing signal SH. In the example of the figure, the control signal B is generated at the time of A → B → C → D → E → A... For each frame.

The frame head pulse FH of generation time (delay time t ₁₎ is determined as the top match of a frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time . The time t _7i is set such that the time delayed from the generation time of the signal SH is within the period of the data DT. The bold line in the control signal B, the control voltage b, and the transmission wave power P indicates the case where the transmission power control is performed according to the present invention, and the thin line indicates the case where the transmission power control is performed according to the conventional example. At the time of transmission power control, the transmission power control unit 26 (FIG. 2) checks the TPC bit T of the received signal S _R , and if the TPC bit T indicates an increase in transmission power, increases the control voltage a by a set amount. If the instruction is to reduce the transmission power, the control voltage a is reduced by a set amount (FIG. 8), and the control voltage a is input to the latch circuit 18.

The latch circuit 18 includes a timing generation circuit 17
The control voltage b is changed at the position A in the period of the data DT by the rise of the control signal B output from the
To the control terminal of the variable attenuator 16a. In the next frame, the control voltage b is set at the position B in the period of the data DT.
And in the next frame, C within the data DT period
, The change time of the control voltage b is similarly switched within the data period and input to the control terminal of the variable attenuator 16a. As a result, the transmitting unit 16 sequentially has regular times A → B → C → D → E → A.
Change the transmission power P at

That is, in the third modified example, the control voltage a is changed by the reception TPC bit in a portion where error correction coding is performed, and the delay time of the control signal B from the reception frame head timing SH is regularly changed. , The transmission power control start timing is regularly shifted. In FIG. 10, the transmission power is changed in the order of A, B, C, D, and E at the timing of A, B, C, D, and E. If the time constant of the control voltage b and the time of the transient phenomenon of the transmission wave output are made sufficiently smaller than the period of the data DT, the power can be changed in the coded part of the error correction of the data part. As described above, the transmission signal S _T at regular changing position within the period of the data DT for controlling the transmission power of the encoding process has not been applied signal portions (the pilot symbols and TPC for error correction Bit) does not cause phase rotation or level fluctuation. On the other hand, an error due to phase rotation or level fluctuation due to transmission power control occurs in a signal portion (data bit) that has been subjected to error correction encoding processing, but the data error can be corrected by an error correction circuit on the receiving side. In addition, the influence of transmission power control on the transmission side on data identification accuracy and reception quality on the reception side can be reduced. In addition, the error correction rate is improved because the positions where errors easily occur in demodulated data are dispersed by the transmission power control. Note that the third modification can also be applied to the first modification. That is, the position where transmission power control is performed regularly can be changed within the period of the signal portion where the reception quality is not measured.

(I) Fourth Modification A second modification is a modification of the data DT from the beginning to the end of the data DT.
Transmission power control is performed at any position within the period.
However, the transmission power change timing within the data period
Identify the switching range and change the transmission power within the range.
It is also possible to switch the mining. like this
Then, in addition to the effect of the second modification, the power change time
Because it is within the setting range, the receiving side
Measurement accuracy by measuring the reception quality using the signal part of
Can be expected to be improved. FIG. 11 shows the fourth variation.
FIG. 3 is a configuration diagram of a timing generation circuit 17 (FIG. 2) according to the embodiment;
35 ₁Is the generation of the reception frame head timing signal SH.
Time t from birth time₁The delayed frame top pulse FH is
First delay circuit that occurs, 35_TwoIs the first tag in the received frame.
Any time t from the time of occurrence of the₈₉Delayed
Control signal B with the time of
The second delay circuit, 35_ThreeIs the frame start pulse F
H, the number of pilot bits and the number of TPC bits
Transmission data string a based on₁, A_TwoIndicates the generation timing of
A third delay circuit for outputting a control signal A, 35 _FourIs delayed
Time t₁A first delay time setting unit for setting_FiveIs predetermined
Any delay time t in the time range₈₉Second delay to set
It is a time setting unit.

FIG. 12 shows the timing generation circuit 17 of FIG.
Transmission power using control signal A and control signal B generated from
It is a timing chart in the case of control. Received signal S
_RIs a pilot symbol P, TPC bits
T, data DT, pilot at the beginning of the frame
Symbols are placed. Data DT contains error correction
For the pilot symbol
Encoding processing for error correction is performed on P and TPC bits T
Is not given. Received frame start timing signal S
Time t from the occurrence time of H₁Flake at delayed time
A frame head pulse FH is generated and the frame head pulse FH is generated.
, A control signal A is generated. Also, the receiving frame destination
Any time t from the generation time of the head timing signal SH
₈₉(T₈≤t₈₉≤t₉) The transmission power control tie
A control signal B for determining the timing is generated. t₈, T₉Is
T to the beginning of data_FiveFrom the end of data DT
The time required for the transmission power control to the previous position by the time Ta
t ₆Then, t_Five≤t₈, T₉≤t₆ Is satisfied, and t₈~ T₉Is within the data period (t_Five
~ T₆).

The frame head pulse FH of generation time (delay time t ₁₎ is determined as the top match of a frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time . The generation time (delay time t ₈₉ ) of the control signal B is determined so as to satisfy t ₈ ≦ t ₈₉ ≦ t ₉ . The rectangular range of the thick line in the control signal B is t ₈ ≦ t ₈₉ ≦
is a period that satisfies the t _9. The thick lines of the control signal B, the control voltage b, and the transmission wave power P indicate the case where the transmission power control is performed according to the present invention, and the thin lines indicate the case where the transmission power control is performed according to the conventional example.

At the time of transmission power control, the transmission power control unit 2
6 (FIG. 2) checks the TPC bit T of the received signal S _{R and, if} the TPC bit T indicates an increase in transmission power, increases the control voltage a by a set amount and instructs a decrease in transmission power. If so, the control voltage a is reduced by the set amount (FIG. 12), and the control voltage a is input to the latch circuit 18. And changing the control voltage b at any position of the latch circuit 18 is within the set range by the rising of the control signal B outputted from the timing generating circuit 17 (t ₈ ~t _9), the control terminal of the variable attenuator 16a of transmitter 16 To enter. As a result, the transmission unit 16 transmits the transmission power P during an arbitrary period of the transmission signal data DT.
To change. That is, the fourth modified example is based on the TP of the received signal.
The control voltage a is changed by the C bit at a timing outside the set range (t _{8 to} t ₉ ) surrounded by a thick line, and the delay time t ₈₉ of the control signal B from the reception frame head timing signal SH is changed.
Is randomly or regularly shifted within the set range, so that the timing of starting the power control is randomized or regularly shifted. If the time constant of the control voltage b and the time of the transient phenomenon of the transmission wave power are made sufficiently smaller than the data period, power control can be performed at the error correction code portion within the set range. Note that the fourth modification can also be applied to the first modification. That is, it is also possible to set the transmission power change timing switching range within the period of the signal portion where the reception quality is not measured, and switch the transmission power change timing within the range.

(B) Second Embodiment (a) Outline FIG. 13 is a schematic explanatory view of a second embodiment of the present invention.
_ST 'is the conventional transmission signal frame format, and _ST is the transmission signal frame format of the second embodiment. The frame of the conventional transmission signal S _T ', the pilot symbols P, TPC bits T, consists of data DT, pilot symbols P are arranged in the frame head. The data DT has been subjected to an encoding process for error correction.
Pilot symbol P and TPC bit T have not been subjected to encoding processing for error correction. In the second embodiment, the frame head of the transmission signal S _T and the signal portion where coding is performed (data portion DT) for error correction,
The pilot symbol P and the TPC bit are shifted from the head of the frame. For example, the data DT is arranged at the head of the frame, and the pilot symbol P and the TPC bit T are arranged after the data DT. Then, the transmission power control is performed on the signal portion (period of the data portion DT) on which the encoding process for error correction at the head of the frame has been performed.

In this way, phase rotation and level fluctuation do not occur in pilot symbols and TPC bits. On the other hand, errors occur due to phase rotation and level fluctuation due to transmission power control in the transmission data, but the data error can be corrected by the error correction circuit on the reception side, and the transmission power control on the transmission side reduces the data identification accuracy and reception quality on the reception side. Impact on the vehicle can be reduced. It should be noted that the head of the frame may be a part where the reception quality is not measured, and the transmission power control may be performed at the head of the frame.

(B) Transmission power control configuration The configuration of the CDMA station of the second embodiment is the same as that of the first embodiment of FIG.
is there. FIG. 14 shows the timing generation circuit 17 of the second embodiment.
It is a block diagram of FIG. 2 (36). ₁Is the received signal frame
Time t from the generation time of signal SH indicating the start timing₁
First to generate a frame start pulse FH at a delayed time
Delay circuit, 36_TwoIs when the frame head pulse FH is generated
Time t_TwoStart the transmission power control with the delayed time
A second delay circuit for outputting a control signal B to be set_Three
Is the frame head pulse FH and the number of data bits
And the number of pilot bits and the number of TPC bits.
Communication data string a₁, A_TwoA system showing the generation timing of (FIG. 2)
A third delay circuit for outputting a control signal A, 36_FourIs the delay time
t₁A first delay time setting unit for setting_FiveIs the delay time
t_TwoIs a second delay time setting unit.

(C) Time chart of transmission power control FIG. 15 is a time chart in the case of performing transmission power control using the control signals A and B generated by the timing generation circuit 17 of FIG. The frame of the received signal S _R is
It is composed of transmission data DT, pilot symbols P and TPC bits T, and data DT is arranged at the head of the frame. The data DT has been subjected to an encoding process for error correction, and the pilot symbol P and the TPC bit T
Have not been subjected to an encoding process for error correction. A frame head pulse FH is generated at a time delayed by time t ₁ from the generation time of the reception frame head timing signal SH, and the control signal A is generated based on the frame head pulse FH.
(A, a, c) are generated and the frame top pulse FH
At a time further delayed by time t _2, a control signal B for determining the transmission power control timing is generated. Frame head pulse FH of generation time (i.e., delay time t _1), the first frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time is determined to match. Also, the generation time of the control signal B, that is, the delay time t
₂ transmission signal is determined to match the frame head of S _T, transmission power control is adapted to start with the frame head of the transmission signal.

(D) Transmission power control At the time of transmission power control, the transmission power control unit 26 (FIG. 2) checks the TPC bit T of the received signal S _R ,
If the bit T indicates an increase in the transmission power, the control voltage a is increased by a set amount. If the bit T is an instruction to decrease the transmission power, the control voltage a is decreased by a set amount (FIG. 15). The voltage a is input to the latch circuit 18. Latch circuit 18 in synchronism with the rise of the control signal B outputted from the timing generating circuit 17, i.e., to change the control voltage b in the frame head of the transmission signal S _T, is input to the control terminal of the variable attenuator 16a. As a result, the transmission unit 16 changes the transmission power P of the transmission signal. As described above, in the second embodiment, since the pilot symbol P and the TPC symbol T are arranged in the frame at the end of the frame, the control voltage b
If the time constant of the transmission wave output and the time of the transient phenomenon of the transmission wave output are made sufficiently smaller than the data period, even if the power control of the transmission wave is changed at the beginning of the frame, the portion where the error correction is coded (reception) (A part where quality is not measured), transmission power control can be performed, and deterioration due to phase rotation and level fluctuation in a pilot part can be prevented.

(C) Third Embodiment (a) Schematic FIG. 16 is a schematic explanatory view of a third embodiment of the present invention, in which S _T
Is a transmission signal frame format of the third embodiment.
The frame consists of a pilot symbol P, a TPC bit T,
Data DT and dummy bits D, a pilot symbol P is arranged at the beginning of the frame, and then TP
C bits T, transmission data DT, and dummy bits D are arranged in this order. In the first and second embodiments, during the period of a signal portion where encoding for error correction is performed, or during the period of a signal portion where reception quality measurement is not performed,
Perform transmission power control. In the third embodiment, when there is a signal portion (dummy bit D) that does not require identification (determination) of transmission data in a frame, transmission power control is performed on a signal portion (dummy bit) that does not require identification of the transmission data. Bit D)
Perform in the period.

(B) Transmission power control configuration The configuration of the CDMA station of the third embodiment is the same as that of the first embodiment of FIG.
is there. FIG. 17 shows a timing generation circuit 17 according to the third embodiment.
It is a block diagram of FIG. 2 (37). ₁Is the first tag in the received frame.
The time t from the generation time of the imaging signal SH₁Delayed frame
A first delay circuit for generating a frame head pulse FH, 37_Two
Is from the generation time of the reception frame head timing signal SH.
Any time t_TenTransmit power control timing based on delayed time
37, a second delay circuit that outputs a control signal B_ThreeIs
The frame start pulse FH is input and the pilot bit
Data sequence a based on the number of bits and the number of TPC bits₁, A_Two
Output a control signal A indicating the generation timing of
Extension circuit, 37 _FourIs the delay time t₁First delay time to set
Setting unit, 37_FiveIs the delay time t_TenAt the time of the second delay to set
The interval setting unit.

(C) Timing chart of transmission power control FIG. 18 is a timing chart showing the transmission power control method of the third embodiment. The frame of the received signal S _R is composed of pilot symbols P, TPC bits T, data DT, and dummy bits D, and the pilot symbols are arranged at the head of the frame. A frame head pulse FH is generated at a time delayed by time t ₁ from the generation time of the reception frame head timing signal SH, and a control signal A (A, B, C) is generated based on the frame head pulse FH.
The control signal B to determine the transmission power control timing in the received frame head timing signal SH time occurrence time than the time t ₁₀ and delay occurs. Frame head pulse FH
Time of occurrence (delay time t _1), the first frame of the transmission signal S _T and the received signal S _R which is generated with a delay predetermined time from the emitting production time is determined to match. Control signal B
Time of occurrence (delay time t ₁₀₎ is determined to occur in the dummy bit D of the transmission signal S _T. The bold line in the control signal B, the control voltage b and the transmission wave power P indicates the case where the transmission power control is performed according to the present invention, and the thin line indicates the case where the transmission power control is performed according to the conventional example.

(D) Transmission power control At the time of transmission power control, the transmission power control unit 26 (FIG. 2) checks the TPC bit T of the received signal S _R from the partner station, and the TPC bit T indicates an increase in transmission power. If so, the control voltage a is increased by a set amount, and if it is an instruction to reduce the transmission power, the control voltage a is decreased by a set amount (FIG. 18), and the control voltage a is input to the latch circuit 18. I do. Latch circuit 18 in synchronism with the rise of the control signal B outputted from the timing generating circuit 17, i.e., to change the control voltage b in the dummy bit portion of the transmission signal S _T, the control terminal of the variable attenuator 16a of transmitter 16 To enter. This allows
The transmission unit 16 changes the transmission power P of the transmission signal. As described above, in the third embodiment, the power control is started from the dummy bit portion D, that is, from the portion that does not require the determination of the transmission data. Therefore, the time constant of the control voltage b and the transient phenomenon of the transmission wave output P Is sufficiently smaller than the number of symbols in the dummy bit portion, power control can be completed in a period in which transmission data determination is not required, and deterioration due to phase rotation and level fluctuation in the pilot portion can be prevented.

(E) Insertion of Dummy Bits Dummy bits D that do not require determination of transmission data exist in a frame when the prescribed number of bits in one frame does not match the actual number of transmission data bits. FIG. 19 shows an example of a dummy bit insertion method. FIG. 19 (a)
FIG. 19B shows an example in which dummy bits are inserted after coding for error correction (convolutional coding), and FIG. 19B shows an example in which dummy bits are inserted before coding. Note that the coding rate R (indicating how many bits one bit becomes by coding) is 3, the constraint length K of the flag is 9, and the frame length is 4
The data length is 5 bits and the data length is 10 bits. FIG. 19 (a)
Then, convolutional coding processing is performed on 10-bit data to generate 30-bit coded data and 8-bit tail bits, and thereafter, 3-bit pilot bits P and 1
Bit TPC bit T is inserted before the data, and a 3-bit dummy bit D is inserted after the data to define
Make a bit frame. In FIG. 19B, 1-bit dummy bit D is inserted after 10-bit data before encoding, and convolution-encoding processing is performed on the 11-bit data to encode 33-bit encoded data and 8-bit tail data. A bit is generated, and thereafter, a pilot bit P of 3 bits and a TPC bit T of 1 bit are arranged before data to form a 45-bit frame.

(D) Fourth Embodiment (a) Principal Configuration Diagram FIG. 20 is a configuration diagram of a main portion according to a fourth embodiment of the present invention.
Is replaced by a tap coefficient multiplication value determination unit 18 '. 11 is a transmission data generation unit,
Two series of transmission data strings a ₁ and a ₂ are generated from pilot bits, TPC bits, and data bits according to the format of the physical channel. The data is alternately distributed bit by bit and an in-phase component (I component: In-Phase compornent)
D1 and quadrature component (Q component: Quadrature compornent) D2
And is input to the transmission data generation unit 11.
The transmission data generation unit 11 has a pilot bit,
TPC bits are added to output two series (I channel, Q channel) of transmission data strings a ₁ and a ₂ .

Numerals 12 ₁ and 12 ₂ denote spreading units for spreading the _two transmission data strings a ₁ and a ₂ using a spreading code of a chip frequency. Numerals 13 ₁ and 13 ₂ denote waveform shaping filters constituted by FIR filters. The tap coefficient values are changed based on the tap coefficient multiplication values c ₁ and c ₂ according to the transmission power control voltage a. 14 ₁ and 14 ₂ are DA converters for DA-converting and outputting the respective filter outputs, 15 are quadrature modulators for orthogonally modulating spread signals of I and Q sequences, 16
Is a transmission unit (Tx) that up-converts a quadrature-modulated signal to a transmission frequency and transmits the signal at a predetermined transmission power. The quadrature modulator 15 is a multiplier 15 for multiplying the I-channel signal and the Q-channel signal by a carrier (sin wave, cos wave).
a and 15b, and a hybrid 15c that combines and outputs the multiplication result.

Reference numeral 17 denotes a transmission unit timing generation circuit.
Based on the signal SH indicating the frame start timing of the received signal from the partner station, a control signal A indicating the generation timing of the transmission data strings a ₁ and a ₂ and a control signal B indicating the transmission power change timing are generated. Control signal B is made to rise in the frame head of the prior art as well as transmission signal S _T of FIG. 28. 18 'is a tap coefficient multiplication value determination unit,
The tap coefficient multiplication value is calculated based on the control voltage a input from the transmission power control unit 26, and the obtained tap coefficient multiplication value is alternately set as c ₁ and c ₂ for each frame to obtain the waveform shaping filters 13 ₁ and 13 ₂ . Fill in each. The waveform shaping filters (FIR filters) 13 ₁ and 13 ₂ change the tap coefficients using the input tap coefficient multiplication values c ₁ and c ₂ . That is, the tap coefficient multiplication value determination unit 18 'increases the tap coefficient multiplication value by a set amount or receives a control voltage a instructing transmission power increase or transmission power reduction from the transmission power control unit 26 (FIG. 2). Reduce and multiply the multiplied value by c
₁ is input to the waveform shaping filters 13 ₁ and 13 ₂ . In the next frame, if control voltage a instructing transmission power increase or transmission power reduction is input from transmission power control section 26 (FIG. 2), tap coefficient multiplication value determination section 18 'similarly sets tap coefficient multiplication value. Is increased or decreased, and the multiplied value is input to the waveform shaping filters 13 ₁ and 13 ₂ as c ₂ . Thereafter, the tap coefficient multiplication value is calculated, and the obtained tap coefficient multiplication value is alternately input to the waveform shaping filters 13 ₁ and 13 ₂ as c ₁ and c ₂ for each frame.

[0056] (b) a waveform shaping filter Figure 21 is a block diagram of a waveform shaping filter configured by the FIR filter n taps, 51 ₁ ~51n the flip to be sent to the next stage sequentially delaying input data sequence delay of up configuration, 52 ₁ ~52n first multiplying the tap coefficient multiplication value c ₁ on the respective tap coefficients a ₁ .about.An that is set in advance
Multiplier, 53 ₁ ~53n is a second multiplier, 54 ₁ ~54n tap coefficient selector for multiplying the tap coefficient multiplication value c ₂ on the respective tap coefficients a ₁ .about.An which is set in advance, the control First multiplier 52 ₁ at the beginning of the frame in synchronization with signal B
Tap coefficients output from the second multipliers 53 ₁ to 53 n are selected at the beginning of the next frame. 55 ₁ ~55n third multiplier for multiplying the tap coefficient a ₁ '~an' output from the selector 54 ₁ ~54n the data values D ₁ -Dn stored in each delay unit, 5
6 is an adder for summing the multiplication results of the multipliers 55 ₁ ~55n, sends the total value as the waveform shaping filter output.
When the tap coefficient multiplication values c ₁ and c ₂ increase, the tap coefficients a ₁ ′ to an ′ increase and the output increases. Conversely, when the tap coefficient multiplication values c ₁ and c ₂ decrease, the tap coefficient a ₁ '-An' becomes smaller and the output decreases.

(C) Transmission Power Control At the time of transmission power control, the transmission power control unit 26 (FIG. 2) uses the TPC that constitutes the frame of the received signal S _R from the partner station.
Check the bit T, and if the TPC bit T indicates an increase in transmission power, increase the control voltage a by a set amount;
If the transmission power is to be reduced, the control voltage a is reduced by the set amount, and the control voltage a is set to the tap coefficient multiplication value determination unit 1.
8 '. When the control voltage a for instructing the transmission power increase is input from the transmission power control unit 25 (FIG. 2), the tap coefficient multiplication value determination unit 18 'increases the tap coefficient multiplication value by a set amount and instructs the transmission power reduction. When the control voltage a to be input is inputted, the multiplication value of the tap coefficient is reduced by the set amount, and the multiplication value of the tap coefficient is input to the waveform shaping filters 13 ₁ and 13 ₂ as c ₁ .

The first multipliers 52 _{1 to} 52 n of the waveform shaping filters 13 ₁ and 13 ₂ calculate the tap coefficient multiplication value c ₁ and the preset tap coefficients a ₁ , a ₂ , a _3. Multiply the actual tap coefficients a ₁ ′, a ₂ ′, and a according to the transmission power.
₃ '... an' is calculated. Tap coefficient selector 54 _1-
54n the first at the beginning of a frame in synchronization with the control signal B 1 of the multiplier 52 ₁ tap coefficients a ₁ output from ~52n '~a
'Select, third multiplier 55 ₁ ~55n tap coefficients a ₁ to a data value D ₁ -Dn stored in the delay units' n ~
an 'and multiply each multiplied value and output.

Next, when receiving the next frame of the received signal S _R , the transmission power control unit 26 checks the TPC bit T. If the TPC bit T indicates an increase in transmission power, the control voltage a Is increased by a set amount, and if the transmission power is instructed, the control voltage a is reduced by the set amount,
The control voltage a is input to the tap coefficient multiplication value determination unit 18 '. Tap coefficient multiplication value decision unit 18 'calculates a tap coefficient multiplication value if the control voltage a is input from the transmission power control unit 26 (FIG. 2), the waveform shaping filter 13 ₁ to the tap coefficient multiplication value as c _2, 13 is input to the _2. Waveform shaping filter 1
3 _1, 13 second multiplier 53 ₁ ～53N tap coefficients are set in advance as the tap coefficient multiplier c ₂ a ₁ a _2, a _2,
a ₃ actual tap coefficients corresponding to the transmission power by multiplying the _{··· an a 1 ', a 2} ', calculates the a ₃ '··· an'. Tap coefficient selectors 54 _{1 to} 54 n select tap coefficients a ₁ 'to an' output from second multipliers 53 ₁ to 53 n at the beginning of the frame in synchronization with control signal B, and third multiplier 55 ₁ to
55n multiplies the tap coefficients a ₁ '~an' data values D ₁ -Dn stored in each delay unit, and outputs by integrating the multiplication values.

Thereafter, the multiplied values of the third multipliers 55 _{1 to} 55 n are integrated by using the tap coefficient multiplied values c ₁ and c ₂ alternately to obtain a waveform shaping filter output. As described above, if the TPC bit T indicates an increase in transmission power, the tap coefficients a ₁ ′, a ₂ ′, a ₃ ′... Increase and the output increases, and the TPC bit T indicates a transmission power phenomenon. , The tap coefficients a ₁ ′, a ₂ ′, a ₃ ′... Decrease and the output decreases.

In summary, in the fourth embodiment, the transmission power is changed not by the input bit string of the filter input but by changing the tap coefficient. That is, the transmission power control unit 26 generates a control voltage a for increasing or decreasing the transmission power based on the TPC bit of the received signal, and the tap coefficient multiplication value determination unit 18 ′ generates a tap coefficient multiplication value c based on the control voltage a. calculating _one or c _2. In the waveform shaping filter, the first or second multiplier which is not selected by the tap coefficient selection units 54 ₁ to 54 n multiplies the tap coefficients a _{1 to} an by the tap coefficient multiplication value c ₁ or c ₂ ,
It is held as an actual tap coefficient (corresponding to the operation in the conventional time chart of FIG. 28). Next, the tap coefficient selectors 54 _{1 to} 54 n select the actual tap coefficients multiplied and held by the first or second multiplier at the beginning of the frame in synchronization with the control signal B (FIG. 2).
8, the waveform shaping process is performed using the tap coefficients.

Waveform shaping filter (FIR filter) 13
_1, 13 ₂ output is obtained by combining response (see FIG. 22) for each impulse in the input impulse train. If the magnitude of the impulse input to this filter is made larger or smaller than the head of the frame by the transmission power control amount, it is possible to prevent the phase rotation and level fluctuation from occurring in the filter output signal as shown in FIG. As described above, according to the transmission power control of the fourth embodiment, it is possible to prevent the phase rotation and the level fluctuation from occurring in the pilot symbols, and to prevent the data identification accuracy and the reception quality from deteriorating. In the fourth embodiment,
Waveform shaping filter 1 based on transmission power control voltage a
Although the tap coefficient values of 3 ₁ and 13 ₂ were changed, a multiplier was provided before the waveform shaping filter, the multiplied value of the multiplier was controlled based on the transmission power control voltage a, and the multiplied value was converted to digital data. The multiplication is performed, and the result of the multiplication is input to the waveform shaping filter to change the filter input level based on the transmission power. As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the claims, and the present invention does not exclude these.

[0063]

As described above, according to the present invention, (1) a period of a transmission signal portion where encoding for error correction is performed, or (2) a period of a transmission signal portion where reception quality is not measured. Or (3) Transmission power control (including transient phenomena) is performed during the period of the transmission signal portion that does not require identification determination of transmission data. If transmission power control is performed during the period of a transmission signal portion (for example, transmission data portion) where error correction encoding is performed as in (1), phase rotation and level fluctuation of pilots and TPC bits can be prevented. . On the other hand, although errors occur due to phase rotation and level fluctuation due to transmission power control in transmission data, data errors can be corrected by an error correction circuit on the receiving side, and the influence of transmission power control on data identification accuracy and reception quality can be reduced. .

If the transmission power control is performed during the period of the transmission signal portion where the reception quality is not measured as in (2), the reception quality measurement is not defined because the portion is not defined to perform the reception quality measurement. No degradation occurs. Also, if the transmission power control is performed during the period of the transmission signal portion (dummy bit portion) that does not require identification of transmission data as in (3),
It is possible to prevent the phase rotation and the level fluctuation from occurring in the pilot bits and the TPC bits. On the other hand, although errors occur due to phase rotation and level fluctuation due to transmission power control in the dummy bits, identification determination is not required and data may be erroneous, so that the influence of transmission power control can be eliminated.

In the above cases (1) and (2), the change timing of the transmission power is switched (a) randomly or (b) regularly within the period of the transmission signal portion. Or (c) Designate a switching range and switch randomly or regularly within the range. According to the above (a) to (c), positions where errors easily occur in demodulated data in transmission power control can be randomly or regularly distributed. In addition, according to (c), since the power change time falls within the set range, the receiving side measures the reception quality using the signal portion outside the range, thereby improving the measurement accuracy. Can be expected.

According to the present invention, (1) the beginning of a frame is a portion where error correction coding is performed, or (2) the beginning of a frame is a portion where reception quality is not measured. Since the power is changed at the head of the frame, it is possible to prevent the phase rotation and level fluctuation from occurring in the pilot bits and the TPC bits. In this case, transmission data has an error due to phase rotation or level fluctuation due to transmission power control. However, since an error correction circuit can correct a data error, the influence of transmission power control can be reduced. Further, according to the present invention, since the transmission power is changed before the waveform shaping filter or in the waveform shaping filter, it is possible to prevent the phase rotation and the level fluctuation from occurring in the filter output signal. Deterioration of data identification accuracy and reception quality can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a CDMA station of the present invention focusing on transmission power control.

FIG. 3 is a timing generation circuit according to the first embodiment;

FIG. 4 is a time chart of transmission power control according to the first embodiment.

FIG. 5 is another timing generation circuit of the first embodiment.

FIG. 6 is another time chart of the transmission power control of the first embodiment.

FIG. 7 is a timing generation circuit according to a second modification;

FIG. 8 is a time chart of transmission power control according to a second modification.

FIG. 9 is a timing generation circuit according to a third modification;

FIG. 10 is a time chart of transmission power control of a third modification.

FIG. 11 is a timing generation circuit according to a fourth modification;

FIG. 12 is a time chart of transmission power control according to a fourth modification.

FIG. 13 is a schematic explanatory view of a second embodiment.

FIG. 14 is a timing generation circuit according to a second embodiment.

FIG. 15 is a time chart of transmission power control of the second embodiment.

FIG. 16 is a schematic explanatory view of a third embodiment.

FIG. 17 is a timing generation circuit according to a third embodiment.

FIG. 18 is a time chart of the transmission power control of the third embodiment.

FIG. 19 is an explanatory diagram of a method of inserting a dummy bit.

FIG. 20 is a configuration diagram of a main part of a transmission unit according to a fourth embodiment.

FIG. 21 is a configuration diagram of a waveform shaping filter.

FIG. 22 is an impulse response waveform diagram of the FIR filter.

FIG. 23 is an explanatory diagram of a filter input / output waveform.

FIG. 24 is a configuration diagram of a receiving device of a mobile station.

FIG. 25 is an explanatory diagram of phase rotation of pilot symbols.

FIG. 26 is a configuration diagram of a main part of a transmission unit.

FIG. 27 is a configuration diagram of a conventional timing generation circuit.

FIG. 28 is a time chart showing conventional transmission power control.

[Explanation of symbols]

 11. Transmission data generation unit 12. Spreading unit 13. Waveform shaping filter 14. DA converter 15. Quadrature modulation unit 16. Transmission unit (Tx) 16a Variable attenuator 17. Transmission unit timing generation Circuit 18 Latch circuit 21 Antenna 22 Reception unit (Rx) 23 Quadrature demodulation unit 24 Despreading unit 25 Detection unit 26 Transmission power control unit 27 TPC bit generation unit 28 ..Reception timing detector 29.Reference timing generator

Claims (10)

[Claims] 1. A transmission power control method for a radio apparatus for transmitting a continuous signal having a signal part subjected to error correction coding and a signal part not subjected to error correction coding, comprising: A transmission power control method comprising: extracting power control data; and performing transmission power control based on the transmission power control data in a signal portion on which the error correction coding is performed. 2. A transmission power control method for a radio apparatus for transmitting a continuous signal having a signal part for measuring reception quality and a signal part for which reception quality is not measured, extracting transmission power control data included in the reception signal. A transmission power control method comprising: performing transmission power control based on the transmission power control data in a signal portion where the reception quality is not measured. 3. The transmission power control method according to claim 1, wherein the timing for changing the transmission power is switched at random within the period of the signal portion. 4. The transmission power control method according to claim 3, wherein a range for switching the transmission power change timing is specified, and the transmission power change timing is switched within the range. 5. The transmission power control method according to claim 1, wherein a plurality of transmission power change timings are provided, and the change timing is switched regularly. 6. The transmission power control method according to claim 5, wherein a range in which the transmission power change timing is switched is specified, and the transmission power change timing is switched within the range. 7. A transmission power control method for a wireless device for transmitting a continuous signal having a signal portion that has been encoded for error correction and a signal portion that has not been encoded for error correction, comprising: Transmitting power control data included in the received signal, extracting transmission power control data included in the received signal, and performing transmission power control based on the transmission power control data at the beginning of the frame. Control method. 8. A transmission power control method for a radio apparatus for transmitting a continuous signal having a signal part for measuring reception quality and a signal part for which reception quality is not measured, wherein the reception quality is not measured at the head of a frame. A transmission power control method comprising: extracting transmission power control data included in a received signal; and performing transmission power control based on the transmission power control data at the beginning of a frame. 9. A transmission power control method for a wireless device for transmitting a continuous signal having a signal portion that does not require identification of transmission data, comprising: extracting transmission power control data included in a received signal; A transmission power control method based on transmission power control based on a signal portion that does not require identification of the transmission data. 10. A transmission power control method for a wireless device having a waveform shaping filter, comprising: extracting transmission power control data included in a received signal; and inputting data to a waveform shaping filter based on the transmission power control data. A transmission power control method characterized by performing transmission power control by controlling a value or a filter coefficient.