MX2007014918A - Transmitting apparatus, receiving apparatus and transmission power control method. - Google Patents

Abstract

A transmitting apparatus, a receiving apparatus and a transmission power control method wherein even in a case of performing a transmission power control of multi-valued modulated symbols, the degradation of reception characteristic and that of network usage efficiency can be avoided. A power control instructing part (204) adjusts, based on an encoding rate and a modulation scheme in a case of applying a power control value, which maximizes the MIMO channel capacity, to each stream, the power control value of a stream, which is the most likely to be affected by a power estimation error, into a reference value, and then applies the adjustment value used for that adjustment to the other streams, that is, the streams that are not likely to be affected by the power estimation error. A power control part (205) performs a transmission power control in accordance with the power control value as adjusted by the power control instructing part (204).

Description

TRANSMITTER APPARATUS, RECEIVING DEVICE AND TRANSMISSION POWER CQSWRQL METHOD FIELD OF INVENTION The present invention relates to a transmitter apparatus, a receiver apparatus and a method of transmission power control used in a wireless communication system that uses a MIMO (multiple entry, multiple output) technique for receiving radio signals transmitted from a plurality of antenna elements in a plurality of antenna elements that carry out wireless communication.

BACKGROUND OF THE INVENTION The technique of supplying a plurality of antennas on both the transmitting and receiving sides prepares a plurality7 of radio wave channels in the space between the radio transmission side and the radio reception side. and the transmission of the signals multiplexed in space through the channels is known as "MIMO" and it is possible to improve the transmission efficiency according to MIMO. There is a link adaptation technique as a peripheral MIMO technique. The link adaptation refers to a technique for adaptively controlling the E or §18799 M-Aryo modulation number (transmission rate), the coding rate and the transmission power distribution, in accordance with changes in the channel environment between the transmitter side and the receiver side. When the link adaptation to MIMO is applied, it is possible to effectively use MIMO channels when distributing power to currents (antennas and transmitter beams for which data is assigned). In addition, in a good quality environment, it is possible to carry out high-frequency use with efficiency using the M-ary modulation such as 16 QAM and 64 QAM. On the other hand, in general, a common pilot is transmitted at a constant power at all times when applying link adaptation or when taking into consideration the monitoring with respect to another cell for transfer. In the patent document 1 a described wireless communication apparatus is known, which uses said technique. This communication apparatus will be briefly described. On the receiving side, the assigned transmission power for currents is calculated based on the channel calculation values and the calculated transmission power is reported to the transmitting side using feedback signals. On the transmitter side, the transmit power is assigned based on the feedback signals. Here, the channel capacity can be maximized by adjusting the transmission power (power distribution) according to the propagation condition of each current. Patent Document 1: Japanese Patent Application Open to the Public Number 2003-078461.

BRIEF DESCRIPTION OF THE INVENTION However, with the technique described in patent document 1 above, assuming a transmission of M-ary modulation symbols, the common pilot channel is transmitted at a constant transmission power, the data portion it is controlled to the transmission power according to the power distribution and in this way it is necessary to calculate a decision axis. If the precision of the transmission power calculation on the receiver side is poor, the reception characteristics deteriorate significantly and, if the transmission power is reported from the transmitter side to the receiver side using signaling or reference signals, the efficiency of channel use. An object of the present invention is to provide a transmitter apparatus, a receiver apparatus and a transmission power control method that prevents deterioration of the reception characteristics and a decrease in the channel usage efficiency when controlling the transmission power of the M-arios modulation symbols. The transmission apparatus according to the present invention uses a configuration that includes: an adjustment section that obtains feedback information that includes power control values for currents, adjusting a power control value for a current that is the most sensitive to an influence of the power calculation error, at a predetermined reference value and to adjust the power control values for other currents using an adjustment value representing a difference between the power control value before adjustment and the value of reference; and a control section that controls the transmission power of each current according to the adjusted power control values. The present invention makes it possible to avoid deterioration of the reception characteristics and a decrease in channel usage efficiency even when controlling the transmission power of the M-Aryo modulation symbols.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a block diagram showing a configuration of the receiving apparatus according to the embodiment 1 of the present invention; Figure 2 is a block diagram showing a configuration of the transmitting apparatus according to the mode 1 of the present invention; Figure 3 is a sequence diagram showing the operations of the receiver apparatus shown in Figure 1 and the transmitter apparatus shown in Figure 2; Fig. 4 is a flow diagram showing a method for determining a current that is most sensitive to the influence of the power calculation error; Figure 5 illustrates a method for determining the current that is most sensitive to the influence of the power calculation error; Fig. 6 is a block diagram showing a configuration of a transmitting apparatus according to mode 2 of the present invention; Figure 7 illustrates the substitution processing of a power control value with a specific value based on a calculation error influence level; Figure 8 is a flow chart showing the substitution processing of a power control value with a specified value based on a calculation error influence level; Fig. 9 is a block diagram showing a configuration of the receiving apparatus according to mode 3 of the present invention; and Figure 10 is a block diagram showing a configuration of the transmitting apparatus according to the mode 3 of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The embodiments of the present invention will be described in detail with reference to the appended figures. Here, configurations that have the same functions will be assigned the same reference numbers and superimposed description will be omitted.

Modality 1 Figure 1 is a block diagram showing a configuration of a receiving apparatus 100 according to mode 1 of the present invention. In this figure, the RF receiver sections 102 convert the radio frequency carrier signals received from the transmitting apparatus through antennas 101 into baseband signals and transmit the converted baseband signals to the channel calculation section 103, the control signal demodulation section 107 and the MIMO demodulation section 108. The channel calculation section 103 demodulates the common pilot signal of the baseband signals transmitted from the RF receiver sections 102, calculates the channel calculation values for all combinations of transmit antennas and receiver antennas using the common pilot signal demodulated, redistributes the calculated channel calculation values according to the corresponding transmit antennas and the receiving antennas and obtains a channel matrix. The resulting channel matrix is transmitted to the power control information generation section 104, the quality information generation section 105 and the MIMO demodulation section 108. The power control information generation section 104 calculate the power control value which maximizes the capacity of the MIMO channel under a predetermined condition using a determinant of the channel matrix transmitted from the channel calculation section 103 and transmits the value of power control calculated to the section 105 of generation of quality information and section 106 e generation of feedback information. The power control value calculated here will be found using the known equation 1 shown below. [1] Cprop = log2 det R + ~ ZZ HPHk > ? JPk = Pr ^ p -DiaS nal (p], p2, ... > pnr) ... Equation 1) Here, H is a channel matrix, s2N is the noise power, In? is an identity matrix that has dimensions that correspond to the receiving antenna number and P is a diagonal matrix that has power pk assigned to transmitting antennas as a component. Equation 1 above determines the power pk (power control value) assigned to each transmitting antenna (current) so that Cprop is maximized under the condition where the total transmit power becomes constant ((p? + P2 + .. . + pnr) = Pr) The quality information generation section 105 finds the received quality of each stream (SINR: signal to interference and noise ratio) using the channel matrix transmitted from a channel calculation section 103 in case that a power control value transmitted from the power control information generation section 104 is applied. After, the quality information generation section 105 determines an applicable modulation scheme and a coding rate based on the SINR and reports the determined modulation scheme and the coding rate to the feedback information generation section 106.

The feedback information generation section 106 generates feedback information indicating the power of the control value transmitted from the power control information generation section 104 and the modulation scheme and the coding rate reported from the power generation section 105. quality information and transmits the feedback information generated to the transmitting device. The control signal demodulation section 107 demodulates modulation information, MIMO multiplexing information and encoding information from the baseband signals transmitted from the RF receiver sections 102 and transmits the demodulated modulation information and the MIMO multiplexed information to the MIMO demodulation section 108 and the encoding information to the deinterleaving / decoding processing section 109. The MIMO demodulation section 108 demodulates MIMO the baseband signals transmitted from the RF receiver sections 102 using the channel matrix transmitted from the channel calculation section 103 and the modulation information as well as the multiplexed MIMO information transmitted from the control signal demodulation sections 107 and transmits a soft (adaptive) decision value that is obtained as a demodulation result, to the deinterleaving / decoding processing section 109. The deinterleaving / decoding processing section 109 deinterleaves the soft decision value transmitted from the MIMO demodulation section 108 based on the encoding information transmitted from the control signal demodulation section 107 and decodes the deinterleaved signal corresponding to the scheme of coding. The signal obtained as a result of decoding is transmitted to a CRC verification section 110. The CRC check section 110 checks the decoding result transmitted from the deinterleaving / decoding processing section 109 and decides whether or not an error exists. When it is confirmed as the verification result that there is no error, the received data is extracted. The decision as to whether or not there is an error is reported to the transmitting device as an acknowledgment of receipt. Figure 2 is a block diagram showing a configuration of a transmitting apparatus 200 according to the embodiment 1 of the present invention. In this figure, the adaptive modulation control section 201 receives feedback information transmitted from the receiving apparatus 100, transmits the encoding information of the received feedback information to the coding / interleaving processing section 202 and transmits the modulation information and the MIMO multiplexed information to the MIMO modulation section 203 and the power control instruction section 204. The coding / interleaving processing section processing section 202 encodes and interleaves transmission data based on the encoding information transmitted from the adaptive modulation control section 201 and transmits the transmission data submitted to coding and interleaved to the section 203 MIMO modulation. The MIMO modulation section 203 modulates MIMO the transmission data transmitted from the coding / interleaving processing section 202 based on the modulation information and the MIMO multiplexed information transmitted from the adaptive modulation control section 201 and transmits modulated MIMO signals to the corresponding power control sections 205 that are provided with antennas 207. The power control instruction section 204, which is an adjustment means, receives the feedback information transmitted from the receiving apparatus 100, extracts the values of Power control for currents from feedback information received and obtains the MIMO multiplexed information and modulation information from the adaptive modulation control section 201. The power control instruction section 204 focuses on the current that is most sensitive to be altered by a power calculation error based on the obtained modulation information and the MIMO multiplexing information and adjusts the power control value for this current in 0 dB (reference value). Power control instruction section 204 applies to the other currents the difference between the power control value for this current before adjustment and the power control value for this current after adjustment as an adjustment value so that the differences between the power control values for the currents before and after the adjustment become equal. The power control instruction section 204 instructs the power control values for the currents adjusted in this way, to section 205 of power control. The power control instruction section 205 controls the power of the MIMO modulated signals transmitted from the MIMO modulation section 203 in accordance with the instructions from the power control instruction section 204. The power-controlled signals are converted to radiofrequency carrier signals in the RF transmission sections 206 and transmitted through the antennas 207. The operations of the previous receiver apparatus 100 and the transmitter apparatus 200 will be described below, with reference to figure 3. In figure 3, the stage (hereinafter abbreviated as "ST", for its acronym in English), 301, the transmitting apparatus 200 transmits the common pilot channel signal to the receiving apparatus 100. In the ST302, the channel calculation section 103 of the receiving section 100 carries out the channel calculation based on the common pilot channel signal transmitted from the transmitting apparatus 200 and finds a channel matrix. In the ST303, the power control information generating section 104 of the receiving apparatus 100 calculates the power control value that maximizes the 'MIMO channel capacity under a predetermined condition using the channel matrix found in the ST302. In the ST304 the quality information generation section 105 that the SINR finds as the received quality of each current in the case of the power control value calculated in the ST303 is applied, and determines an applicable modulation scheme and a coding rate Based on the SINR. In the ST305, the feedback information generation section 106 generates feedback information representing the power control value found in the ST303 and the modulation scheme and the coding rate determined in the ST304 and transmits the feedback information generated on the ST305 to the transmitting apparatus 200. In the ST307, the MIMO modulation section 203 of the transmitting apparatus 200 modulates MIMO the transmission data based on the modulation information and the MIMO multiplexed information included in the feedback information. In the ST308, the power control instruction section 204 focuses on the current that is most sensitive for the influence of the power calculation error based on the modulation information and the multiplexed MIMO information included in the feedback information. and the power control value and adjust the power control value for this current to "0". In addition, this adjustment value is applied to the other currents. Here, the method of determining the power control instruction section 204, the current that is the most sensitive to influence the power calculation error will be described with reference to FIG. 4. In the ST351 of FIG. 4, the The amount of information included in the amplitude component is compared between the modulation schemes of each stream and the stream is selected which includes the largest amount of information. In ST352, it is decided whether a plurality of streams having the largest amount of information in ST351 is selected or not. When a plurality of streams are selected ("YES"), the stream advances to ST353 and, when a plurality of streams ("NO") are not selected, the current selected in ST351 is determined as the stream that is the most sensitive to the influence of the power calculation error. In the ST353, the coding rates of the selected currents in the ST352 are compared and the highest coding rate current is selected and the selected current is determined as the current that is most sensitive to the influence of the power calculation error . The method shown in Fig. 4 will then be described in detail using a case of two streams as an example. Figure 5 is a table that tabulates the modulation schemes and the coding rates of the currents (MCS: modulation and coding scheme) and the currents that are most sensitive to the influence of the power calculation error. As shown in figure 5, the MCS is QPSK and the coding rate ("R") = 1/2 for current 1 and the MCS is 16 QAM and R = 1/2 for current 2, a The minimum distance between the QPSK symbols is greater than for 16 QAM, which provides that there is no amplitude component and therefore is less senessable to the influence of the power calculation error. Accordingly, the current 2 to which 16 QAM is applied is determined as the current that is most sensitive for the influence of the power calculation error. further, when the MCS is 64 QAM and R = 3/4 for current 1 and the MCS is 16 QAM and R = 3/4 for current 2, 16 QAM has a greater distance between the modulated symbols than 64 QAM and therefore it is less sensitive to the influence of power calculation error. Consequently, the current 1 to which 64 QAM is applied is determined as the current that is most sensitive to the influence of the power calculation error. Also, when the MCS is QPSK and R = 1/3 for current 1 and the MCS is QPSK and R = 1/2 for current 2, the influence of the deterioration factors that include the calculation error become greater when the coding speeds (closer to 1) are lower. Consequently, the current 2 to which R = 1/2 is applied is determined as the current that is most sensitive to the influence of the power calculation error. Similarly, when the MCS is 16 QAM and R = 3/4 for current 1 and the MCS is 16 QAM and R = 1/2 for current 2, current 1 at which R = 3/4 is applies is determined as the current that is most sensitive to the influence of the power calculation error. Next, the power control value adjustment method will be described in detail using a case as an example where the MCS is QPSK and R = 1/2 for current 1 and the MCS is 16 QAM and R = 1/2 for the current 2. The power control instruction section 204 redistributes the currents in order from which it has the greatest influence of the power calculation error based on the table shown in figure 5 and classifies the current 2 in order and current 1. Then, the power control value for each current is ined. Here, the power control value for current 1 is -1 dB and the power control value for current 2 is +1 dB. The current that is most sensitive to the influence of the power calculation error is current 2 and thus the power control value of +1 dB of current 2 is set to 0 dB. Here, the adjustment value is -1 dB and in this way, if this adjustment value is applied to the other current, that is, current 1, the power control value for current 1 becomes -2 dB. Referring again to Figure 3, in the ST309, in accordance with the power control value set in the ST308, the transmission processing such as the power control of the MIMO modulated signal in the ST307 and the transmission processing of RF are carried out in the power control sections 205 and the RF transmission sections 206, sequentially. In the ST310, the data subjected to transmission processing in the ST309 is transmitted to the receiving apparatus 100 and a control signal including modulation information, MIMO multiplexing information and encoding information is transmitted to the receiving apparatus 100. In ST311, the MIMO demodulation section 108 of receiver apparatus 100 demodulates MIMO data based on the control signal. In ST312, the deinterleaving / decoding processing section 109 performs error correction decoding on the demodulated MIMO data. In ST313, the data after the error correction decoding is subjected to CRC verification in the CRC verification section 110. In the ST314, the CRC verification section 110 transmits a reception acknowledgment indicating whether or not an error exists, to the transmitting apparatus 200. In this way, according to mode 1, a power control value is calculated by current that maximizes the MIMO channel capacity, the power control value for the current that is most sensitive to the influence of the calculation error of power is adjusted to a reference value based on a modulation scheme and the coding rate in case the calculated power control value is applied and an adjustment value required for this adjustment is applied to the other current, that is, a current which is less sensitive to the influence of the power calculation error, so that it is possible to carry out the demodulation by maintaining the received quality without calculating the power control value on the receiving side and carrying out the power distribution.

Modality 2 Figure 6 is a block diagram showing a configuration of a transmitting apparatus 400 according to mode 2 of the present invention. In this figure, the value storage section 401 specifying the transmission power stores the same power control value relative to the common pilot channel or the value obtained by multiplying the power control value by immersing the number of currents, as values that specify the transmission power. The power control instruction section 402 adjusts the power control value for the current that is most sensitive to the influence of the power calculation error, to 0 dB and applies this adjustment value to other currents. Furthermore, when a plurality of the MCS are divided into levels, for example level 1, level 2 ... (referred to as "calculation error influence levels") in order for the MCS to be less sensitive to the influence of the error of power calculation and there is a current greater than a given level, having a set power control value different from 0 dB, the power control instruction section 402 replaces the power control value set for the current with a specification value closest to the power control value set for the current, outside of the specification values stored in the transmission power specification value storage section 401. Next, the substitution processing of the power control value with a specific value based on a calculation error influence level will be described in detail, with reference to FIG. 7 and FIG. 8 using a case of four streams as An example. Here, the calculation error influence level (hereinafter referred to as the "specification value application level") at which the transmission power specification value is applicable, is level 3. Figure 7 shows a table of correspondence where the influence levels of calculation error according to the modulation schemes are 2 for 16 QAM and 1 for QPSK, and the influence level of calculation error according to the coding rates is set to twice the speed of coding. In figure 8, in ST451, the influence level of calculation error is calculated for each current according to the modulation scheme and, in ST452, the influence level of calculation error according to each current is calculated according to with the speed of coding. In addition, in ST453, adding the calculation error level according to the modulation scheme calculated in ST451 and the calculation error influence level according to the coding rate calculated in ST452, a value is found total of the calculation error influence levels and the table shown in figure 7 is generated. In the ST454, the current that maximizes the calculation error influence level is selected based on the total value of the calculation levels. influence of calculation error found in ST453 and current 2 of the table shown in figure 7 is selected. In the ST455 the power control value for current 2 in ST454 is selected and adjusted in "0" In ST456, the current different from the current having the maximum calculation error influence level of currents having a total value of calculation error influence levels equal to or greater than the specified value application level is selected ( here, level 3) and stream 1 is selected from the table in figure 7. In ST457, the power control value for stream 1 is selected in ST456 and replaced with a specification value stored in the section 401 storage of transmission power specification value. In addition, current 3 and current 4 have calculation error influence levels lower than the threshold value and in this way it is decided to carry out a transmission power control at an arbitrary value and a power control is carried out of transmission by applying the adjustment value. In this way, according to mode 2, when there is a current sensitive to the influence of the power calculation error, in addition to the current that is most sensitive to the influence of the power calculation error, it is possible to reduce the amount of secondary information to report power control values from the transmitting apparatus to the receiving apparatus by using a transmission power specification value determined in advance as the power control value.

Modality 3 Figure 9 is a block diagram showing a configuration of the receiving apparatus 500 according to the mode 3 of the present invention. In this figure, when the power control value transmitted from the power control information generation section 104 is applied, a quality information generation section 501 finds the SINR of each current using the channel matrix transmitted from the section 103 of channel calculation and determines an applicable modulation scheme and a coding rate based on the SINR. In addition, the quality information generation section 501 transmits the excess value of the power control value (hereinafter simply referred to as the "excess value") transmitted from the power control information generating section 104 with respect to the transmission power which satisfies the received quality required by the modulation scheme and the determined coding rate, to the section 503 of generation of feedback information. The transmission power deviation storage section 502 stores the transmission power deviation values associated with the excess value.

When the excess value is transmitted from the quality information generation section 501, the feedback information generation section 503 searches for the deviation value associated with the excess value of the transmission power deviation storage section 502. and generates feedback information by subtracting the deviation value from the transmission power of the corresponding current. Figure 10 is a block diagram showing a configuration of a transmitter apparatus 600 according to the mode 3 of the present invention. In this figure, the transmission power deviation instruction section 601 receives the feedback information transmitted from the receiving apparatus 500, extracts the transmission power deviation value included in the received feedback information and transmits the deviation value extracted. to section 602 of power control instruction. The power control instruction section 602 adjusts the power control value for the current that is most sensitive to the influence of the power calculation error, to 0 dB. Then, the power control instruction section 602 obtains the maximum deviation value transmitted from the transmission power deviation instruction section 601 and replaces the adjustment value with the value obtained by subtracting the maximum deviation value from the value of adjustment. In addition, power control instruction section 602 applies the adjustment value substituted to all currents. In this way, according to mode 3, when there is a current that satisfies the required received quality, for which excessive power is established, an adjustment value substituted with a value obtained by subtracting a value is applied to all the currents. deviation value associated with the excess value of the adjustment value and the adjustment value substituted, so that it is possible to reduce the total transmission power and reduce the interference component for other cells. Although cases with the previous embodiment have been described as examples where the present invention is configured by physical elements (hardware). However, the present invention can also be embodied as programs (software). Each function block used in the description of each of the modalities mentioned above can typically be implemented as an LSI constituted by an integrated circuit. These can be individual chips that are partially or totally contained on a single chip. It is adopted here "LSI" but this can also be determined as "IC", an "LSI system", a "super LSI" or "ultra LSI" based on the different degrees of integration. further, the circuit integration method is not limited to the LSI and implementation is also possible using dedicated circuits of general purpose processors. After the manufacture of LSI, it is also possible to use an FPGA (field programmable gate array) or a reconfigurable processor where the connections and settings of the circuit cells can be reconfigured within an LSI. In addition, if the integrated circuit technology replaces the LSI as a result of the advancement of semiconductor technology or other derived technology, it is naturally also possible to carry out the function block integration using this technology. The application of biotechnology is also possible. The present application is based on Japanese Patent Application Number 2005-161089, filed on June 1, 2005, the entire contents of which are expressly incorporated by reference herein.

Industrial Applicability The transmitting apparatus, the receiving apparatus and the transmission power control method according to the present invention make it possible to avoid the deterioration of the reception characteristics and a decrease in the channel use efficiency even when the power is controlled of transmission of the M-ary modulation symbols and are useful for a MIMO transmission apparatus and a MIMO receiving apparatus.

RELATION OF THE REFERENCES THAT APPEAR IN THE FIGURES FIG. 1 100 RECEIVER DEVICE 102 RF RECEPTOR SECTION 107 CONTROL SIGNAL DEMODULATION SECTION 108 MIMO DEMODULATION SECTION 103 CHANNEL CALCULATION SECTION 109 UNCONTROLLED / DECODING PROCESSING SECTION 110 CRC VERIFICATION SECTION RECEIVED DATA 105 GENERATION SECTION QUALITY INFORMATION 104 POWER CONTROL INFORMATION GENERATION SECTION 106 FEEDBACK INFORMATION GENERATION SECTION BACK FEED INFORMATION 200 TRANSMITTER DATA TRANSMITTER APPARATUS 202 CODING / INTERCALING PROCESSING SECTION 201 ADAPTABLE MODULATION CONTROL SECTION BACKUP INFORMATION 203 MIMO MODULATION SECTION 205 POWER CONTROL SECTION 204 POWER CONTROL INSTRUCTION SECTION 206 RF TRANSMISSION SECTION 200 TRANSMITTER APPARATUS 100 RECEIVER DEVICE ST301 TRANSMIT COMMON PILOT CHANNEL SIGNAL ST302 CHANNEL CALCULATION ST303 GENERATE POWER CONTROL INFORMATION ST304 MEASURE QUALITY ST305 GENERATE FEEDBACK INFORMATION ST306 TRANSMIT IMITATION RETROACTION INFORMATION ST307 STANDARD M30 STMOD ST308 DISTRIBUTE ST309 POWER PROCESS ST310 TRANSMISSION DATA SIGNAL / CONTROL ST311 ST312 MIMO DEMODULAR DECODE ERROR CORRECTION ST313 DETECT ERROR ST314 TRANSMIT RECEPTION RECOGNITION START ST351 SELECT LARGEST QUANTITY OF INFORMATION INCLUDED IN THE AMPLITUDE COMPONENT ST352 IS THERE A PLURALITY OF CURRENTS OF LARGEST AMOUNT OF INFORMATION? ST353 SELECT CODING SPEED CURRENT HIGH END MCS FOR CURRENT 1 MCS FOR CURRENT 2 CURRENT THAT IS MORE SUSCEPTIBLE OF INFLUENCE OF CURRENT POWER CALCULATION ERROR 2, 1 400 TRANSMITTER DATA TRANSMITTER APPARATUS 202 ENCODING / INTERCHANGE PROCESSING SECTION 201 ADAPTABLE MODULATION CONTROL SECTION IMMEDIATE 203 RETROACTION INFORMATION MIMO MODULATION SECTION 205 POWER CONTROL SECTION 402 POWER CONTROL INSTRUCTION SECTION 206 RF TRANSMISSION SECTION 401 POWER TRANSMISSION SECTION SPECIFYING STORAGE VALUE CURRENT #, 1, 2, 3, 4 CALCULATION OF INFLUENCE LEVEL OF ERROR ACCORDING TO THE MODULATION SCHEME INFLUENCE OF ERROR LEVEL CALCULATION ACCORDING TO THE CODING SPEED OF TOTAL SUM OF THE LEVEL OF INFLUENCE OF CALCULATION ERROR START ST451 CALCULATE CALCULATION ERROR INFLUENCE LEVEL ACCORDING TO MODULATION SCHEME ST452 CALCULATE CALCULATION ERROR INFLUENCE LEVEL ACCORDING TO CODING SPEED ST453 CALCULATE TOTAL VALUE OF CALCULATION ERROR INFLUENCE ST454 SELECT LEVEL CURRENT INFLUENCE OF MAXIMUM CALCULATION ERROR ST455 ADJUST POWER CONTROL VALUE FOR CURRENT MAXIMUM IN "0" ST456 SELECT CURRENT EQUAL OR GREATER THAN A LEVEL OF APPLICATION OF SPECIFIED VALUE, DIFFERENT FROM THE MAXIMUM CURRENT ST457 REPLACE POWER CONTROL VALUE WITH VALUE SPECIFIED END FIG. 9 500 RECEIVER DEVICE 102 RF RECEIVER SECTION 107 CONTROL SIGNAL DEMODULATION SECTION 108 MIMO DEMODULATION SECTION 103 CHANNEL CALCULATION SECTION 109 UNCONTROLLED / DECODING PROCESSING SECTION 110 CRC VERIFICATION SECTION RECEIVED DATA 501 SECTION OF INFORMATION GENERATION SECTION QUALITY 104 CONTROL INFORMATION GENERATION SECTION POWER 503 REVERSE INFORMATION IMAGE FEEDING SECTION OF FEEDBACK INFORMATION 502 TRANSMISSION POWER DEVIATION STORAGE SECTION FIG. 10 600 TRANSMISSION DATA APPARATUS 202 CODING / INTERCALING PROCESSING SECTION 201 ADAPTABLE MODULATION CONTROL SECTION REIMBURSEMENT INFORMATION 203 MIMO MODULATION SECTION 205 POWER CONTROL SECTION 602 POWER CONTROL INSTRUCTION SECTION 601 DEFLECTION INSTRUCTION SECTION OF TRANSMISSION POWER 206 RF TRANSMISSION SECTION It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (8)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. A transmitting apparatus, characterized in that it comprises: an adjustment section that obtains feedback information including power control values for currents, adjusting a power control value for a current that is most sensitive to the influence of calculation error of power, at a predetermined reference value and adjusting the power control values for the other currents using an adjustment value representing a difference between the power control value before adjustment and the reference value; and a control section that controls the transmission power of each current according to the adjusted power control values. 2. The transmitting apparatus according to claim 1, characterized in that the adjustment section determines the current that is most sensitive to the influence of power calculation error based on modulation schemes and coding rates applied to the currents. 3. The transmitting apparatus according to claim 1, characterized in that it further comprises a storage section that stores the same power control value with respect to a common pilot channel signal or a value obtained by multiplying a power control value by the reciprocal of a number of currents, such as a transmission power specification value, where, when there is a current sensitive to the influence of the power calculation error, in addition to the current which is most sensitive to the influence of the calculation error of power, the adjustment section replaces a feedback power control value with the transmission power specification value. The transmitting apparatus according to claim 1, characterized in that when there is a current satisfying the required received quality, for which an excessive power control value is established, the adjustment section replaces the set value with a value which is obtained by subtracting a deviation value associated with the excess value from the adjustment value and adjusting all currents using the substituted adjustment value. 5. A wireless communication base station apparatus, characterized in that it comprises the transmission apparatus according to claim 1. 6. A receiver apparatus, characterized in that it comprises: a channel calculation section that obtains a channel matrix by carrying out a channel calculation using a common pilot channel signal; a power control information generating section that calculates the power control values for streams that maximize the channel capacity under a predetermined condition using the channel matrix; a quality information generation section that finds the received quality of each current in case the power control values are applied to the currents using the channel matrix, and determines modulation schemes and coding rates applicable to each current based on the received quality calculated; and a feedback information generating section that transmits feedback information including the power control values, the modulation schemes and the coding rates to the transmitting apparatus, according to claim 1. 7. A receiver apparatus, characterized because it comprises: a channel calculation section that obtains a channel matrix when carrying out a channel calculation using a common pilot channel signal; a power control information generating section that calculates the power control values for streams that maximize the channel capacity under a predetermined condition using the channel matrix; a quality information generation section that finds the received quality of each current in case power values are applied to the currents using the channel matrix and determines modulation schemes and coding rates applicable to each current based on in the quality received; a deviation storage section that stores an excess value associated with the deviation values; and a feedback information generating section that transmits feedback information including the power control values, modulation schemes, coding rates and deviation values to the transmitter apparatus, in accordance with claim 4. 8. An apparatus of a wireless communication mobile station characterized in that it comprises the receiving apparatus according to claim 6. A transmission power control method, characterized in that it comprises: in a receiving apparatus: calculating the power control values for currents that maximize the channel capacity under a predetermined condition using a channel matrix; find the received quality of each current in case the power control values are applied to the currents using the channel matrix and determine modulation schemes and coding rates applicable to each current based on the received quality; and transmitting feedback information including the power control values, the modulation schemes and the coding rates to the transmitting apparatus, and in the transmitting apparatus: obtaining feedback information including the power control values for the device currents receiver, adjust the power control value for a current that is the most sensitive, to an influence of the power calculation error and adjust the power control values for other currents using an adjustment value representing a difference between the value of power control before adjustment and a reference value; and controlling the transmission power of the currents according to adjusted power control values. A wireless communication system, characterized in that it comprises: a receiving apparatus comprising: a channel calculation section that obtains a channel matrix by carrying out a channel calculation using a common pilot channel signal; a power control information generating section that calculates the power control values for streams that maximize the channel capacity under a predetermined condition using the channel matrix; a quality information generation section that finds the received quality of each current in case power values are applied to the currents using the channel matrix and determines modulation schemes and coding rates applicable to each current based on in the received quality; and a feedback information generating section that transmits feedback information including the power control values, the modulation schemes and the coding rates to a transmitting apparatus; and the transmitting apparatus comprises: an adjustment section that obtains information from - - feedback that includes the power control values for the currents from the receiving apparatus, adjust the power control value for a current that is most sensitive to the influence of a power calculation error, to a reference value and adjusts the power control values for other currents using an adjustment value representing a difference between the power control value before adjustment and a reference value; and a control section that controls the transmission power of the currents according to the adjusted power control values. SUMMARIES? OF THE INVENTION There is provided a transmitting apparatus, a receiving apparatus and a transmission power control method wherein even in the case of performing power control of multiple-valued modulated symbols, the degradation of the characteristics of the transmitter can be avoided. reception and efficiency of network use. A power control instruction part (204) adjusts, based on the coding rate and a modulation scheme in a case of application of a power control value, which maximizes the MIMO channel capacity, to each current, to the power control value of a current, which is the most likely to be affected by a power calculation error, at a reference value and then applies the adjustment value used for said adjustment to the other currents, ie , the currents that are probably not affected by the power calculation error. A power control part (205) performs a transmission power control in accordance with the power control value as adjusted by the power control instruction part (204).