WO2004049596A1 - 通信方法及び送信装置、受信装置 - Google Patents
通信方法及び送信装置、受信装置 Download PDFInfo
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- WO2004049596A1 WO2004049596A1 PCT/JP2003/015057 JP0315057W WO2004049596A1 WO 2004049596 A1 WO2004049596 A1 WO 2004049596A1 JP 0315057 W JP0315057 W JP 0315057W WO 2004049596 A1 WO2004049596 A1 WO 2004049596A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
Definitions
- the present invention relates to a communication method, a transmitting device, and a receiving device in a system for performing wireless communication using a plurality of antennas for both transmission and reception.
- MIMO Multiple-Input Multiple-Output
- MIMO is a system that uses multiple antennas for both transmission and reception, and simultaneously transmits and receives independent signals in the same band using multiple eigenvectors.
- MIM M the transmission capacity can be increased without expanding the frequency band.
- the transmitting device controls parameters such as adaptive modulation processing based on the received electric field strength of the entire system estimated by the receiving device in order to improve the throughput. For example, the transmitting device performs a process of increasing the number of modulation levels when the received electric field strength of the entire system is higher than a predetermined threshold. This is the same for the conventional MIMO.
- the received electric field strength may fluctuate greatly between channels.
- MIMO performs adaptive modulation processing based on the received electric field strength of the entire system, one channel Even when the received electric field strength is extremely large compared to other channels, the modulation multi-level number is increased. As a result, the reception quality deteriorates in a large number of channels having a small reception electric field strength. Disclosure of the invention
- An object of the present invention is to provide a communication method, a transmission device, and a reception device that can improve reception quality in a system that performs wireless communication using a plurality of antennas for both transmission and reception.
- the multiplexed signal cannot be completely separated, and a part of the received signal strength of the received signal cannot be used for the demodulation processing.
- the reception electric field strength that can be used for demodulation processing in a system that performs wireless communication using multiple antennas for both transmission and reception is referred to as effective reception electric field strength.
- the object of the present invention is achieved by controlling parameters such as a modulation method based on the received electric field strength and the effective received electric field strength of the entire system.
- FIG. 1 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 1
- FIG. 2 is a block diagram illustrating a configuration of a communication terminal apparatus according to Embodiment 1
- FIG. 3 is a block diagram according to Embodiment 1.
- FIG. 4 is a diagram illustrating an example of a frame configuration of a transmission signal of a base station device.
- FIG. 4 is a diagram showing propagation channels between the base station device and the communication terminal device according to Embodiment 1.
- FIG. 5 is a diagram showing an example of a frame configuration of a transmission signal of the communication terminal apparatus according to Embodiment 1.
- FIG. 6 is a diagram showing a table stored in an internal memory of a modulation method control unit of the base station apparatus according to Embodiment 1.
- FIG. 7 is a diagram showing an internal configuration of a modulation processing portion of the SZP section of the base station apparatus according to Embodiment 1.
- FIG. 8 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 2
- FIG. 9 is a block diagram illustrating a configuration of a communication terminal apparatus according to Embodiment 2
- FIG. 10 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 3
- FIG. 11 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 4
- FIG. 13 is a block diagram showing the configuration of the base station apparatus according to Embodiment 5
- FIG. 13 is a block diagram showing the configuration of the base station apparatus according to Embodiment 6
- FIG. 14 is the configuration of the base station apparatus according to Embodiment 7.
- FIG. 15 is a diagram showing an example of a frame configuration of a transmission signal of the base station apparatus according to Embodiment 7.
- FIG. 16 is a diagram showing a configuration example of each symbol group of the transmission signal of FIG. 15;
- FIG. 17 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 8
- FIG. 18 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 9
- FIG. 9 is a diagram illustrating an example of a space-time coding method in FIG. 9,
- FIG. 20 is a diagram illustrating an example of a frame configuration of a transmission signal when performing the encoding illustrated in FIG.
- FIG. 21 is a diagram showing an example of a space-time coding method in the case of four transmission antennas in Embodiment 9.
- FIG. 22 is a diagram illustrating an example of a frame configuration of a transmission signal when the encoding illustrated in FIG. 21 is performed.
- FIG. 23 is a diagram illustrating an example of a frame configuration of a transmission signal of a base station apparatus when a frequency-space coding method is performed in the case of four transmission antennas in Embodiment 9,
- FIG. 24 is a diagram illustrating an example of a frame configuration of a transmission signal of a base station device when a frequency-time-space coding method is performed in the case of four transmission antennas in Embodiment 9,
- FIG. 25 is a diagram illustrating an example of a frame configuration of a transmission signal of a base station apparatus when a space-time coding method is performed in the case of four transmission antennas in Embodiment 9, and FIG. An example of the frame configuration of the transmission signal of the base station apparatus when the frequency-space coding method is applied in the case of four transmission antennas in Embodiment 9 Diagram,
- FIG. 27 is a diagram illustrating an example of a frame configuration of a transmission signal of a base station apparatus when a frequency-time-space coding method is performed in the case of four transmission antennas in Embodiment 9,
- FIG. 28 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device according to Embodiment 9.
- FIG. 29 is a block diagram showing a configuration of a base station apparatus according to Embodiment 10
- FIG. 30 is a diagram showing a relationship between received electric field strength and level
- FIG. 31 is a block diagram illustrating a configuration of a base station device according to Embodiment 11;
- FIG. 32 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device according to Embodiment 11;
- FIG. 33 is a diagram illustrating an example of a frame configuration of a transmission signal of the communication terminal device according to Embodiment 11.
- FIG. 34 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device according to Embodiment 11.
- FIG. 35 is a diagram showing an example of a frame configuration of a transmission signal of the base station apparatus according to Embodiment 11.
- FIG. 36 is a block diagram showing the configuration of the base station apparatus according to Embodiment 12
- FIG. 37 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 13
- FIG. 39 is a block diagram illustrating a configuration of a transmission apparatus according to Embodiment 14
- FIG. 40 is a block diagram illustrating a configuration of a transmission apparatus according to Embodiment 14,
- FIG. 40 is a block diagram illustrating a configuration of a reception apparatus according to Embodiment 14.
- FIG. 41 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 15;
- FIG. 42 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 16; 3 is a block diagram showing the configuration of the base station apparatus according to Embodiment 17, and FIG. 44 is a block diagram showing the configuration of the base station apparatus according to Embodiment 18.
- OFDM orthogonal frequency division multiplexing
- CDMA Code Division Multiple Accesses
- Embodiment 1 describes a case where a modulation method is controlled based on the reception electric field strength and the effective reception electric field strength of the entire system in multicarrier communication using MIMO.
- FIG. 1 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1.
- base station apparatus 100 includes, on the transmitting side, frame forming sections 101-1, 101-2, S / P sections 102-1, 102-2, IDFT sections 103-1, 103-2. And radio sections 104-1, 104-2 and transmission antennas 105-1, 105-2. Further, base station apparatus 100 includes reception antenna 151, radio section 152, demodulation section 153, separation section 154, and modulation method control section 155 on the reception side.
- Each of the frame configuration units 101-1 and 101-2 receives the transmission digital data, inserts a channel estimation symbol and a guard symbol into the transmission digital data, generates a transmission digital signal, and converts the digital signal into an SZP unit 102-1. 1, 102 1 Output to 2.
- the channel estimation symbol is a symbol for estimating time synchronization, frequency synchronization, and distortion due to a transmission path.
- Signal is suitable.
- Guard Shinponore usually has Symbol is inserted.
- the S / P section 102-1 receives the transmission digital signal, performs serial-to-parallel conversion processing, performs adaptive modulation processing according to the instruction from the modulation method control section 155, and converts the parallelized modulation signal. Is output to the IDFT section 1 0 3— 1.
- the SZP section 102-2 receives the transmission digital signal, performs serial-to-parallel conversion processing, performs adaptive modulation processing according to the instruction from the modulation method control section 1505, and converts the parallelized modulation signal into an IDFT signal. Output to section 1 03-2. The details of the adaptive modulation processing in the 3 /? Sections 102-1 and 102-2 will be described later.
- the IDFT section 103_1 receives the parallelized modulated signal, performs IDFT conversion processing, generates a transmission baseband signal, and outputs this to the radio section 1044-1.
- the IDFT section 103_2 receives the parallelized modulated signal, performs IDFT conversion processing to generate a transmission baseband signal, and outputs this to the radio section 1044-2.
- IFFT Inverse Fast Fourier Transform
- the radio section 104_1 receives a transmission baseband signal, up-converts the signal, generates a transmission signal (hereinafter, referred to as “transmission signal A”), and transmits the transmission signal to the transmission antenna 105-1. Wirelessly from.
- Radio section 104_2 receives a transmission baseband signal, up-converts the signal, generates a transmission signal (hereinafter referred to as “transmission signal B”), and transmits it to transmission antenna 105-5-2. Wirelessly from.
- Radio section 152 receives the received signal received by receiving antenna 151, downconverts the received signal to generate a received baseband signal, and outputs this to demodulation section 153.
- Demodulation section 153 receives the received baseband signal, demodulates it to generate a reception digital signal, and outputs this to separation section 154.
- the separation unit 154 converts the received digital signal into a data symbol (received digital data), an information symbol (hereinafter, referred to as a “first information symbol”) indicating the received electric field strength of the entire system, and an average effective received electric field strength.
- Information symbol hereinafter, " And outputs the first and second information symbols to the modulation method control unit 155.
- Modulation method control section 155 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and reads the value of the average effective received electric field strength from the second information symbols. Then, modulation method control section 155 determines a modulation method of the transmission signal based on these values, and outputs a control signal (hereinafter, referred to as a “modulation method instruction signal”) indicating the determined modulation method by three. Output to sections 102-1 and 102-2. The details of the modulation method determination process in modulation method control section 155 will be described later.
- communication terminal apparatus 200 includes reception antennas 201-1, 201-2, radio sections 202-1, 202-2, DFT sections 203-1, 203-2 on the receiving side, and data separation. It has sections 204-1 and 204-2, channel estimation sections 205-1 to 205-4, and a signal processing section 206. Further, communication terminal apparatus 200 transmits eigenvalue calculating section 251, electric field strength estimating section 252, effective electric field strength calculating section 253, frame composing section 254, modulating section 255, radio section 256, Antenna 257.
- Radio section 202_1 receives the received signal received by receiving antenna 201-1, downconverts the received signal, generates a received baseband signal, and outputs this to DFT section 203-1.
- the radio section 202-2 receives the received signal received by the receiving antenna 201-2, down-computes it to generate a received baseband signal, and outputs this to the DFT section 203-2.
- DFT section 203-1 receives the received baseband signal, performs DFT conversion processing on the received baseband signal, and outputs the result to data separation section 204-1 and electric field strength estimation section 252.
- 0-to 203_2 receives the received baseband signal, DFT conversion processing is performed and output to the data separation unit 2044-2 and the electric field strength estimation unit 252.
- FFT Fast Fourier Transform
- the data separation unit 204_1 separates the DFT-converted received baseband signal into a channel estimation symbol of transmission signal A, a channel estimation symbol of transmission signal B, and a data symbol. Is output to the channel estimator 205-1, the channel estimation symbol of the transmission signal B is output to the channel estimator 205-2, and the data symbol is output to the signal processor 206.
- the data separation unit 2044-2 separates the DFT-converted received baseband signal into a channel estimation symbol for transmission signal A, a channel estimation symbol for transmission signal B, and a data symbol. It outputs to channel estimator 205-13, outputs the channel estimation symbol of transmission signal B to channel estimator 205-4, and outputs the data symbol to signal processor 206.
- the channel estimator 2055-1 receives the channel estimation symbol of the transmission signal A received by the reception antenna 201, and estimates the time synchronization and frequency synchronization of the transmission signal A and distortion due to a transmission path. (Hereinafter referred to as “channel estimation”), and outputs a channel estimation value indicating a processing result to the signal processing unit 206 and the eigenvalue calculation unit 251.
- the channel estimation unit 205--2 receives the channel estimation symbol of the transmission signal B received by the reception antenna 201-1-1, performs channel estimation of the transmission signal B, and converts the channel estimation value to the signal processing unit 2 0 6 and output to the eigenvalue calculator 25 1.
- the channel estimation unit 205-3 receives the channel estimation symbol of the transmission signal A received by the reception antenna 210-1-2, estimates the channel of the transmission signal A, and outputs the channel estimation value to the signal processing unit. Output to 206 and the eigenvalue calculation unit 251.
- the channel estimation unit 205_4 inputs the channel estimation symbol of the received transmission signal B to the reception antenna 201-1-2, estimates the channel of the transmission signal B, and outputs the estimated channel value to the signal processing unit. Output to 206 and the eigenvalue calculation unit 251.
- the signal processing unit 206 demodulates the data symbols using the channel estimation value and generates received digital data. Examples of the demodulation method include a method of performing an inverse matrix operation on a matrix composed of data symbols using a channel matrix composed of channel estimation values, and a method of performing MLD (Maximum Like Khood Detection).
- the eigenvalue calculator 25 1 receives the channel estimation values of the transmission signals A and B, calculates the eigenvalues corresponding to the matrix formed by the channel estimation values, and calculates the eigenvalues as the effective electric field strength calculator 25 3 Output to Known methods for calculating eigenvalues include the Jaco'bi method, Givens method, Householder method, QR method, QL method, QL method with implicit s fts, inverse iteration method, etc. . These methods are similarly employed in the following embodiments.
- the electric field strength estimator 2 52 2 receives the received baseband signals subjected to the DFT conversion processing, determines the received electric field strength that is the square of the amplitude of each received baseband signal, and determines the estimated received electric field strength. Are added and averaged to obtain the received electric field strength of the entire system. Then, the electric field strength estimator 252 outputs the received electric field strength corresponding to each received baseband signal to the effective electric field strength calculator 253, and outputs the received electric field strength of the entire system to the frame composing section 254. I do.
- the effective electric field strength calculator 253 inputs the received electric field strength and eigenvalue corresponding to each received baseband signal, multiplies each received electric field strength by the minimum power of the eigenvalue to obtain the effective received electric field strength, and obtains the effective received electric field strength.
- the average effective electric field strength is obtained by averaging the electric field strength, and the average effective received electric field strength is output to the frame composing section 254.
- the minimum power of this eigenvalue is the value that is the main factor that determines the BERR (Bit Error Rate) and PERR (Packet Error Rate) characteristics of the system.
- the frame configuration section 254 receives the transmission digital data, the received electric field strength of the entire system and the average effective received electric field strength, generates a first information symbol indicating the received electric field strength of the entire system, and calculates the average effective received electric field strength. The second information symbol shown is generated. Then, frame forming section 254 transmits the first and second information symbols. A transmission digital signal is generated by inserting it into the transmission digital data, and this is output to the modulation section 255.
- Modulation section 255 receives a transmission digital signal, modulates the signal, generates a transmission baseband signal, and outputs the signal to radio section 256.
- the transmission line band 256 receives the transmission baseband signal, up-converts the signal to generate a transmission signal, and wirelessly transmits the signal from the transmission antenna 257.
- FIG. 3 is a diagram showing an example of a frame configuration of a transmission signal of the base station apparatus according to the present embodiment.
- a frame of transmission signal A is composed of a channel estimation symbol 301, a guard symbol 302, and a data symbol 303 in this order.
- the transmission signal B has a frame composed of a guard symbol 351, a channel estimation symbol 352, and a data symbol 353.
- the beginnings of the frames of transmission signal A and transmission signal B have the same timing, and guard symbols 302/351 indicate that the channel estimation symbol 301 of transmission signal A and the channel estimation symbol 352 of transmission signal B Inserted so as not to overlap.
- the channel estimation symbols 301 and 352 are temporally independent.
- FIG. 4 is a diagram showing a propagation channel between the base station apparatus and the communication terminal apparatus according to the present embodiment.
- transmission signal A (T a (t)) is transmitted from transmission antenna 105-1 and transmission signal B (Tb (t)) is transmitted from transmission antenna 105-2.
- the receiving antenna 201-1 receives a signal (R l (t)) obtained by combining the transmission signal A having received the channel fluctuation h ll (t) and the transmission signal B having received the channel fluctuation hl 2 (t). Is done.
- the receiving antenna 201-2 receives a signal (R2 (t)), which is a combination of the transmission signal A having received the channel fluctuation h21 (t) and the transmission signal B having received the channel fluctuation h22 (t). Is done.
- R2 (h21 (t), T (t)
- the matrix composed of hll (t), hl2 (t), h21 (t), and h22 (t) in Equation (1) is called a channel matrix.
- the eigenvalue calculation unit 251 calculates an eigenvalue corresponding to the channel matrix of Expression (1).
- the channel matrix is an n ⁇ n matrix.
- FIG. 5 is a diagram showing an example of a frame configuration of a transmission signal of the communication terminal apparatus according to the present embodiment.
- a frame of a transmission signal is composed of a first information symbol 501, a second information symbol 502, and a data symbol 503 in this order.
- FIG. 6 is a diagram showing a table stored in the internal memory of modulation method control section 155.
- the modulation method control unit 155 calculates the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and determines the optimal modulation method from the table shown in FIG. 6 based on the magnitude relationship between the difference X and the threshold values TH1 and TH2. To determine. For example, when the difference X is equal to or larger than the threshold value TH1 and smaller than the threshold value TH2, the modulation method control unit 155 determines that the QPSK modulation method is optimal. Then, modulation method control section 155 outputs a modulation method instruction signal to SZP sections 102-1, 102-2.
- the effective received electric field strength indicates the received electric field strength based on the relative relationship of each element of the channel matrix. Therefore, if adaptive modulation processing is performed based on the effective received electric field strength, one channel is obtained. Even when the received electric field strength is extremely large compared to the other channels, it is possible to improve the reception quality in a large number of channels having a small received electric field strength without increasing the number of modulation levels.
- FIG. 7 is a diagram showing an internal configuration of a modulation processing portion of the SZP sections 102-1 and 102-2. .
- the 3 /? Units 102-1 and 102-2 include selection units 701 and 705, a BPSK modulation unit 702, a QPSK modulation unit 703, and a 16Q AM modulation unit 704, respectively.
- Selection section 701 outputs a transmission digital signal to one of BPSK modulation section 702, QPSK modulation section 703 or 16Q AM modulation section 704 according to a modulation method instruction signal from modulation method control section 155.
- BPSK modulation section 702 modulates the transmission digital signal with BPSK (Binary Phase Shift Keying), and outputs the modulated signal to selection section 705.
- QPSK modulating section 703 modulates the transmission digital signal by QPSK (Quadrature Phase Shift Keying) and outputs the modulated signal to selecting section 705.
- 16 QAM modulation section 704 modulates the transmission digital signal by 16 QAM (16 Quadrature Amplitude Modulation) and outputs the modulated signal to selection section 705.
- the selection unit 705 is a unit that outputs a modulation signal output from one of the 8-3 modulation unit 702, the QP SK modulation unit 703, or the 16 QAM modulation unit 704 according to the optimal modulation method instructed by the modulation method control unit 155. Is output to the IDFT sections 103-1 and 103-1.
- controlling the modulation method based on the received electric field strength and the effective received electric field strength of the entire system allows the relative relationship between the channels to be determined. Since control can be performed in consideration of the above, reception quality can be improved.
- Embodiment 2 describes a case where, in single carrier communication using MIMO, a modulation method is controlled based on the reception electric field strength and the effective reception electric field strength of the entire system.
- FIG. 8 is a block diagram showing a configuration of a base station apparatus according to Embodiment 2. Note that, in the base station device 800 shown in FIG. 8, the same components as those of the base station device 100 shown in FIG.
- Base station apparatus 800 shown in FIG. 8 differs from base station apparatus 100 shown in FIG. 1 in that SZP sections 102-1, 102-2, IDFT sections 103-1, 103-2 are deleted, and modulation section 801 — Addition of 1, 801-2 and diffusion units 802-1, 802-2
- the configuration adopted is as follows.
- Each of frame forming sections 101-1 and 101-2 receives transmission digital data, inserts a channel estimation symbol and a guard symbol into the transmission digital data to generate a transmission digital signal. Output to 801-2.
- Modulation method control section 155 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and reads the value of the average effective received electric field strength from the second information symbols. Then, modulation method control section 155 determines the modulation method of the transmission signal based on these values, and outputs a modulation method instruction signal indicating the determined modulation method to modulation sections 801-1 and 801-2.
- Modulation section 801-1 receives a transmission digital signal, performs adaptive modulation processing according to an instruction from modulation method control section 155, and outputs a modulated signal to spreading section 802-1.
- Modulation section 801-2 receives the transmission digital signal, performs adaptive modulation according to the instruction from modulation method control section 155, and outputs the modulated signal to spreading section 802-2.
- Spreading section 802-1 receives the modulated signal, performs spreading processing, and outputs the spread signal to radio section 104-1.
- Spreading section 802-2 receives the modulated signal, performs spreading processing, and outputs the spread signal to radio section 104-2.
- Radio section 104-1 receives the spread signal, up-converts the spread signal, generates transmission signal A, and transmits the transmission signal A by radio from transmission antenna 105-1.
- Radio section 104-2 receives the spread signal, upconverts the spread signal, generates transmission signal B, and transmits the transmission signal B wirelessly from transmission antenna 105-2.
- FIG. 9 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 2.
- the same components as those of the communication terminal device shown in FIG. 2 are denoted by the same reference numerals as those in FIG.
- Communication terminal apparatus 900 shown in FIG. 9 differs from communication terminal apparatus 200 shown in FIG. 2 in that DFT sections 203-1 and 203-2 are deleted and despreading sections 901-1 and 901 are provided. Use a configuration in which 1 is added.
- the radio section 202-1 receives the received signal received by the receiving antenna 201-1, downconverts the received signal to generate a received baseband signal, and despreads the received baseband signal. Output to 1.
- the radio unit 202-2 receives the received signal received by the receiving antenna 2011-2, downconverts the received signal to generate a received baseband signal, and despreads the received baseband signal 901-1-2. Output to
- Despreading section 901-1-1 receives the received baseband signal, performs despreading processing on the received baseband signal, and outputs the result to data separation section 2044-1 and field strength estimation section 2552.
- Despreading section 9 01-2 receives the received baseband signal, performs despreading processing on the received baseband signal, and outputs the result to data separation section 204-2 and electric field strength estimation section 25 2.
- the data separation unit 2044-1 separates the despread reception baseband signal into a transmission signal A channel estimation symbol and a transmission signal B channel estimation symbol and a data symbol, and then demultiplexes the transmission signal A channel estimation symbol.
- the data demultiplexing unit 2044-2 demultiplexes the despread received baseband signal into a channel estimation symbol for the transmission signal A, a channel estimation symbol for the transmission signal B, and a data symbol.
- the electric field strength estimator 252 inputs the despread received baseband signals, estimates the received electric field strength that is the square of the amplitude of each received baseband signal, and adds the estimated received electric field strength. By averaging, the received electric field strength of the entire system is obtained. Then, the electric field strength estimating section 25 2 outputs the received electric field strength corresponding to each received baseband signal to the effective electric field strength calculating section 25 3, and calculates the received electric field strength of the entire system as the frame composing section 25 4 Output to
- Embodiment 3 describes a case where, in multicarrier communication using MIMO, transmission antennas are switched based on the reception electric field strength and the effective reception electric field strength of the entire system. Note that the configuration of the communication terminal apparatus of the present embodiment is the same as communication terminal apparatus 200 of FIG. 2 described in Embodiment 1, and thus description thereof is omitted.
- FIG. 10 is a block diagram showing a configuration of a base station apparatus according to Embodiment 3.
- the same components as those of the base station device 100 shown in FIG. 1 are denoted by the same reference numerals as those in FIG.
- the base station apparatus 1000 shown in FIG. 10 differs from the base station apparatus 100 shown in FIG. 1 in that the modulation method control section 150 is deleted, the antenna control section 105 A configuration in which a unit 1001 and a transmitting antenna 105-3 are added is adopted.
- Demultiplexing section 154 outputs the first and second information symbols to antenna control section 105.
- the antenna control unit 1051 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and reads the value of the average effective received electric field strength from the second information symbol. Then, antenna control section 1051 determines whether or not to switch the transmitting antenna based on these values, and determines the transmitting antenna. Specifically, the antenna control unit 1051 obtains a difference X between the received electric field strength of the entire system and the average effective received electric field strength, and switches the transmitting antenna when the difference X is smaller than a predetermined threshold. Is not performed, and when the difference X is equal to or larger than the predetermined threshold, it is determined that the transmission antenna is switched.
- antenna control section 1051 outputs a control signal indicating the determined transmission antenna (hereinafter, referred to as “transmission antenna instruction signal”) to antenna selection section 1001.
- Radio section 104-1 receives the transmission baseband signal, upconverts it, generates transmission signal A, and outputs this to antenna selection section 1001.
- Radio section 104-2 receives the transmission baseband signal, upconverts the signal, generates transmission signal B, and outputs this to antenna selection section 1001.
- the antenna selection unit 1001 selects two different transmission antennas from the transmission antennas 105-1 to 105-3 as the transmission antennas for the transmission signal A and the transmission signal B in accordance with the transmission antenna instruction signal from the antenna control unit 1051.
- the transmission signal A and the transmission signal B are transmitted by radio using the selected transmission antenna.
- the base station apparatus transmits ⁇ (105 — 1, 105—2), (105-2, 105—3), (105 For ⁇ 3, 105 — 1), calculate the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and select the pair of transmitting antennas with the smallest difference X.
- ⁇ 105 — 1, 105—2), (105-2, 105—3), (105 For ⁇ 3, 105 — 1)
- calculate the difference X between the received electric field strength of the entire system and the average effective received electric field strength and select the pair of transmitting antennas with the smallest difference X.
- a simpler method is to use the two antenna elements with the longest distance between antenna elements. This is because, in general, the more distant an antenna is, the lower the antenna correlation and channel correlation are, which is suitable for the MIMO system used in the present embodiment.
- Embodiment 4 describes a case where, in single carrier communication using MIMO, transmission antennas are switched based on the reception electric field strength and the effective reception electric field strength of the entire system.
- the configuration of the communication terminal device according to the present embodiment is the same as communication terminal device 900 in FIG. 9 described in the second embodiment, and a description thereof will not be repeated.
- FIG. 11 is a block diagram showing a configuration of a base station apparatus according to Embodiment 4.
- the same components as those of the base station apparatus 800 shown in FIG. 8 are assigned the same reference numerals as in FIG.
- the base station apparatus 110 shown in FIG. 1.1 is different from the base station apparatus 800 shown in FIG. 8 in that the modulation method control section 15 5 is deleted, the antenna control section 1 1 5 1 and the antenna A configuration in which a selection unit 1101 and a transmission antenna 105-5-3 are added is adopted.
- Demultiplexing section 154 outputs the first and second information symbols to antenna control section 1151.
- the antenna control unit 1151 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbol, and reads the value of the average effective received electric field strength from the second information symbol. Then, antenna control section 1151 determines whether or not to switch the transmission antenna based on these values, and determines the transmission antenna. Specifically, the antenna control unit 1 151 finds the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and switches the transmitting antenna if the difference X is smaller than a predetermined threshold. Is not performed, and when the difference X is equal to or larger than the predetermined threshold, it is determined that the transmission antenna is switched. Then, antenna control section 1151 outputs a transmission antenna instruction signal indicating the determined transmission antenna to antenna selection section 1101.
- Radio section 1044-1 receives a transmission baseband signal, upconverts the signal, generates transmission signal A, and outputs this to antenna selection section 1101.
- Radio section 1044-2 receives the transmission baseband signal, upconverts the signal, generates transmission signal B, and outputs this to antenna selection section 1101.
- antenna selection section 1101 selects transmission antennas 105-1 to 105-5 as transmission antennas for transmission signal A and transmission signal B.
- the transmission signal A and the transmission signal B are wirelessly transmitted using the selected transmission antenna.
- the transmission cancellation is performed based on the reception electric field strength and the effective reception electric field strength of the entire system.
- the control can be performed in consideration of the relative relationship between the channels, so that the reception quality can be improved.
- Embodiment 5 describes a case in which transmission power is changed based on the reception electric field strength and the effective reception electric field strength of the entire system in multicarrier communication using MIMO.
- the configuration of the communication terminal device of the present embodiment is the same as that of communication terminal device 200 of FIG. 2 described in the first embodiment, and a description thereof will be omitted.
- FIG. 12 is a block diagram showing a configuration of a base station apparatus according to Embodiment 5. Note that, in the base station apparatus 1200 shown in FIG. 12, the same components as those of the base station apparatus 100 shown in FIG.
- the base station apparatus 1200 shown in FIG. 12 differs from the base station apparatus 100 shown in FIG. 1 in that the modulation method control section 1505 is deleted, the transmission power control section 1251 and the transmission A configuration in which a part change unit 1 2 0 1—1 and 1 2 0 1-2 is added is adopted.
- Demultiplexing section 154 outputs the first and second information symbols to transmission power control section 1251.
- the transmission power control unit 1251 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbol, and calculates the value of the average effective received electric field strength from the second information symbol. read. Then, transmission power control section 1251 determines transmission power based on these values. Specifically, the transmission power control section 1251 obtains the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and sets the transmission power to be larger as the difference X is smaller. Then, the transmission power control section 1251 transmits a control signal indicating the determined transmission power (hereinafter, referred to as a “transmission power instruction signal”) to the transmission power changing section 1201—1, 1201- Output to 2.
- a control signal indicating the determined transmission power hereinafter, referred to as a “transmission power instruction signal”
- Radio section 1044-1 receives a transmission baseband signal, performs up-comparison on the transmission baseband signal, generates transmission signal A, and outputs this to transmission power changing section 1201-1-1.
- the radio section 1044-2 receives the transmission baseband signal and The signal is converted to a transmission signal B, which is output to the transmission power changing section 1201-1-2.
- the transmission power changing section 1 201-1 changes the transmission power of the transmission signal A according to the transmission power instruction signal from the transmission power control section 125 1, and wirelessly transmits the transmission signal A having the changed transmission power.
- the transmission power changing section 1 2 0 1-2 changes the transmission power of the transmission signal B according to the transmission power instruction signal from the transmission power control section 1 2 5 1, and wirelessly transmits the transmission signal B with the changed transmission power. . ⁇ ⁇
- Embodiment 6 describes a case in which the transmission power is changed based on the reception electric field strength and the effective reception electric field strength of the entire system in the single carrier communication using the MIMO. Note that the configuration of the communication terminal device of the present embodiment is the same as that of communication terminal device 900 of FIG. 9 described in Embodiment 2, and a description thereof will be omitted.
- FIG. 13 is a block diagram showing a configuration of a base station apparatus according to Embodiment 6. Note that, in the base station apparatus 1300 shown in FIG. 13, the same components as those of the base station apparatus 800 shown in FIG.
- the base station apparatus 130 shown in FIG. 13 differs from the base station apparatus 800 shown in FIG. 8 in that the modulation method control section 15 5 is deleted, the transmission power control section 13 A configuration in which a part change unit 1 3 0 1-1 and 1 3 0 1-2 are added is adopted.
- Demultiplexing section 154 outputs the first and second information symbols to transmission power control section 1351.
- the transmission power control unit 1351 receives the first and second information symbols, reads the reception field strength of the entire system from the first information symbols, and The value of the average effective received electric field strength is read from it. Then, transmission power control section 1351 determines transmission power based on these values. Specifically, the transmission power control section 1351 obtains the difference X between the reception electric field strength of the entire system and the average effective reception electric field strength, and sets the transmission power to be larger as the difference X is smaller. Then, transmission power control section 1351 outputs a transmission power instruction signal indicating the determined transmission power to transmission power changing sections 1301-1-1 and 1301-2.
- Radio section 1044-1 receives a transmission baseband signal, performs up-comparison on the transmission baseband signal to generate transmission signal A, and outputs this to transmission power changing section 13001-1.
- Radio section 1044-2 receives the transmission baseband signal, up-converts the signal, generates transmission signal B, and outputs the signal to transmission power changing section 1301-2.
- the transmission power changing section 1301-1 changes the transmission power of the transmission signal A according to the transmission power instruction signal from the transmission power control section 1351, and transmits the transmission signal A having the changed transmission power to the radio.
- the transmission power changing unit 13 01-2 changes the transmission power of the transmission signal B in accordance with the transmission power instruction signal from the transmission power control unit 13 51 and wirelessly transmits the transmission signal B with the changed transmission power. .
- the relative power between channels can be improved. Since control can be performed in consideration of the relationship, reception quality can be improved.
- Embodiment 7 describes a case in which the communication method is changed based on the reception electric field strength and the effective reception electric field strength of the entire system in multi-carrier communication using MIMO.
- the configuration of the communication terminal device of the present embodiment is the same as communication terminal device 200 of FIG. 2 described in the first embodiment, and a description thereof will not be repeated.
- FIG. 14 is a block diagram showing the configuration of the base station apparatus according to Embodiment 7.
- the base station device ft 1400 shown in FIG. 14 the base station device 1 shown in FIG. Components common to those of 00 are denoted by the same reference numerals as in FIG. 1 and description thereof is omitted.
- the base station apparatus 1400 shown in FIG. 14 differs from the base station apparatus 100 shown in FIG. 1 in that the modulation method control section 155 is deleted, the communication method control section 1451, the transmission power changing sections 1201-1-1, 1201-1-2.
- the antenna selection unit 1001 and the transmission antenna 105-3 are added.
- Separating section 154 outputs the first and second information symbols to communication method control section 1451.
- the communication method control unit 1451 inputs the first and second information symbols, reads the received electric field strength of the entire system from the first information symbol, and reads the value of the average effective received electric field strength from the second information symbol. Then, communication method control section 1451 determines a modulation method, a transmission power, and a transmission antenna based on these values. Then, communication method control section 1451 outputs the modulation method instruction signal to SZP sections 102-1, 102-2, outputs the transmission antenna instruction signal to antenna selection section 1001, and changes the transmission power instruction signal to the transmission power. Output to section 1201-1-1, 1201-2.
- the S / P section 102_1 receives the transmission digital signal, performs serial-to-parallel conversion processing, performs adaptive modulation processing according to the modulation method instruction signal from the communication method control section 1451, and converts the parallelized modulation signal to the IDFT section. Output to 103—1.
- the SZP section 102-2 receives the transmission digital signal, performs serial-to-parallel conversion processing, performs adaptive modulation processing according to the modulation method instruction signal from the communication method control section 1451, and converts the parallelized modulation signal to the IDFT section 103. — Output to 2.
- Radio section 104-1 receives the transmission baseband signal, upconverts the signal, generates transmission signal A, and outputs this to transmission power changing section 1201-1.
- Radio section 104-2 receives the transmission baseband signal, upconverts the signal, generates transmission signal B, and outputs this to transmission power changing section 1201-2.
- Transmission power changing section 1201-1 is configured to transmit transmission power from communication method control section 1451. According to one instruction signal, the transmission power of transmission signal A is changed, and transmission signal A having the changed transmission power is output to antenna selection section 1001.
- the transmission power changing section 1 2 0 1 1 2 changes the transmission power of the transmission signal B according to the transmission power instruction signal from the communication method control section 1 4 5 1, and transmits the transmission signal B with the changed transmission power to the antenna selection section. Output to 1001.
- the antenna selection unit 1 001 transmits the transmission signals A and B as the transmission antennas for the transmission signal A and the transmission signal B.
- the transmission signal A and the transmission signal B are wirelessly transmitted by selecting two different ones from among the three and using the selected transmission antenna.
- FIG. 15 is a diagram illustrating an example of a frame configuration of transmission signals A and B of the base station apparatus according to the present embodiment.
- the frames of transmission signals A and B are configured by symbol groups in time and frequency units. You. .
- FIG. 16 is a diagram showing a configuration example of each symbol group of transmission signals A and B in FIG. 15.
- Each symbol group of transmission signals A and B is composed of a channel estimation symbol 1601 and a data symbol 16. It consists of 02.
- the data symbol 1602 is switched to Guard mode in which no modulated signal exists, and to QPSK :, 16QAM, or 64QAM mode as a modulation method.
- the communication terminal apparatus 200 calculates the average effective received electric field strength and the received electric field strength of the entire system from the channel estimation symbol 1601 shown in FIG. Send to
- the communication method control section 1441 of the base station apparatus 1400 determines the communication method (modulation method, transmission power, transmission antenna) based on the average effective received electric field strength and the received electric field strength of the entire system. .
- the communication method control unit 1451 decides to increase the transmission power of the transmission signal A and the transmission signal B and leave the modulation method and the transmission antenna as they are.
- the symbols of the transmission signal A and the transmission signal B are QPSK-modulated and transmitted from the transmission antennas 105-1 and 105-2 at a higher transmission power than at time 1.
- the communication method control unit 1451 sets the transmission signal A modulation method to 16 QAM, the transmission signal B to the Guard symbol (the one that does not transmit the data symbol 1602), and increases the transmission power. However, it decides to keep the transmitting antenna as it is.
- the symbol group of the transmission signal A is subjected to 16 QAM modulation and transmitted from the transmission antenna 105-1—with a transmission power larger than that at the time 2, and the channel estimation of the transmission signal B is performed. Only the symbol is transmitted from the transmitting antenna 105--2 with a higher transmitting power than at time 2. It should be noted that, as in time 3, from a state in which signals have been transmitted from two transmitting antennas so far, a signal with a higher number of modulation levels is transmitted from one transmitting antenna, thereby securing transmission capacity. The reception quality of the reception signal can be improved.
- the communication method control unit 1441 sets the modulation method of the transmission signal A to 64 QAM, the transmission signal B to the Guard symbol, the transmission power as it is, the transmission antenna 1055-1, It is determined that transmission signal A and transmission signal B are transmitted from 105-3.
- the value of the element of the matrix of the above equation (1) changes, and the eigenvalue changes. It is possible that the number of multiplexed transmission signals can be increased, and the data transmission speed can be improved.
- the symbol group of the transmission signal A is subjected to 64 Q AM modulation, transmitted from the transmission antenna 105-1, with the same transmission power as at the time 3, and the channel estimation of the transmission signal B is performed. Only the symbols are transmitted from the transmitting antennas 105-3 with the same transmit power as at time 3.
- the communication method control section 1451 sets the modulation method of the transmission signal A and the transmission signal B to 16 QAM, increases the transmission power, and sets the transmission antennas 1055-1 and 105-5-3. It is decided to transmit transmission signal A and transmission signal B respectively.
- the symbol groups of the transmission signal A and the transmission signal B are subjected to 16 QAM modulation, and the transmission antennas 10 5 — 1 and 10 5 are transmitted at a higher transmission power than at time 4.
- Embodiment 8 describes a case in which the communication method is changed based on the reception electric field strength and the effective reception electric field strength of the entire system in single carrier communication using MIMO.
- the configuration of the communication terminal device of the present embodiment is the same as that of communication terminal device 200 of FIG. 2 described in Embodiment 1, and a description thereof will be omitted.
- FIG. 17 is a block diagram showing a configuration of a base station apparatus according to Embodiment 8. Note that, in the base station apparatus 170 shown in FIG. 17, the same components as those of the base station apparatus 800 shown in FIG. 8 are denoted by the same reference numerals as in FIG.
- the base station apparatus 1700 shown in FIG. 17 is different from the base station apparatus 800 shown in FIG. Then, the modulation method control unit .155 is deleted, and the communication method control unit 1751, the transmission power changing units 1301-1-1, 1301-2, the antenna selection unit 1101, and the transmission antenna 105-3 are added.
- Separating section 154 outputs the first and second information symbols to communication method control section 1751.
- the communication method control unit 1751 inputs the first and second information symbols, reads the received electric field strength of the entire system from the first information symbol, and reads the value of the average effective received electric field strength from the second information symbol. Then, communication method control section 1751 determines a modulation method, transmission power, and transmission antenna based on these values. Then, communication method control section 1751 outputs a modulation method instruction signal to modulation sections 801-1 and 801-2, outputs a transmission antenna instruction signal to 1101, and changes the transmission power instruction signal to transmission power. Output to section 1301—1, 1 301-2.
- Modulation section 801_1 receives the transmission digital signal, performs adaptive modulation processing according to the modulation method instruction signal from communication method control section 1751, and outputs the modulated signal to spreading section 802-1.
- Modulation section 801_2 receives the transmission digital signal, performs adaptive modulation processing according to the modulation method instruction signal from communication method control section 1751, and outputs the modulated signal to spreading section 802-2.
- Radio section 104_1 receives the transmission baseband signal, up-converts the signal, generates transmission signal ⁇ , and outputs this to transmission power changing section 13011-11.
- Radio section 104-2 receives the transmission baseband signal, upconverts the signal, generates transmission signal B, and outputs this to transmission power changing section 1301-2.
- Transmission power changing section 1301-1 changes the transmission power of transmission signal A in accordance with the transmission power instruction signal from communication method control section 1751, and outputs transmission signal A having the changed transmission power to antenna selection section 1101.
- the transmission power changing section 1301-1 2 changes the transmission power of the transmission signal B according to the transmission power instruction signal from the communication method control section 1751, and transmits the transmission signal B having the changed transmission power to the antenna selection section. Output to 1101.
- the antenna selection unit 1101 sets the transmission antennas 105 to 1 to 105 as transmission antennas for the transmission signal A and the transmission signal B in accordance with the transmission antenna instruction signal from the communication method control unit 1751.
- the transmission signal A and the transmission signal B are wirelessly transmitted by selecting two different ones from among the three and using the selected transmission antenna.
- the relative relationship between channels can be improved. Therefore, the reception quality can be improved.
- MIMO communication and communication for performing predetermined coding are switched based on the received electric field strength of the entire system and the effective received electric field strength.
- encoded communication transmission diversity gain is obtained without depending on a power propagation channel whose transmission rate is lower than in MIMO communication, so that transmission quality is improved.
- a coding method such as time-space, frequency-space, or temporal-temporal space coding, and the like.
- FIG. 18 is a block diagram showing a configuration of a base station apparatus according to Embodiment 9. Note that, in the base station apparatus 180 shown in FIG. 18, the same components as those of the base station apparatus 100 shown in FIG. The base station apparatus 180 shown in FIG. 18 differs from the base station apparatus 100 shown in FIG. 1 in that the modulation method control section 155 is deleted and the coding method control section 185 1 and A configuration in which an encoding unit 1801 is added is adopted.
- Demultiplexing section 154 outputs the first and second information symbols to encoding method control section 1851.
- the encoding method control unit 1851 inputs the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and The value of the average effective received electric field strength is read from it. Then, encoding method control section 1851 determines whether to perform MIMO communication or to perform encoded communication based on these values. Specifically, the encoding method control unit 1851 obtains the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and if the difference X is smaller than a predetermined threshold, the MIMO communication Is performed, and when the difference X is equal to or larger than a predetermined threshold, it is determined that the coded communication is performed. Then, encoding method control section 1851 outputs a control signal (hereinafter, referred to as “communication method instruction signal”) indicating the determined communication method to encoding section 1801.
- communication method instruction signal a control signal
- the frame composing sections 101-1-2 and 101--2 receive transmission digital data, insert a channel estimation symbol and a guard symbol into the transmission digital data, generate a transmission digital signal, and code the transmission digital signal. Output to the conversion section 1801.
- the coding section 1801 receives the transmission digital signal, and performs coding processing when code communication is instructed by the communication method instruction signal from the coding method control section 1851, and performs coding.
- the digitized transmission digital signal is output to the S / P section 102-1, 1024.
- coding section 1801 receives the transmission digital signal, and performs coding processing when MIMO communication is instructed by the communication method instruction signal from coding method control section 1851. It does not perform this operation, and outputs the transmission digital signal to the SZP section 102-1-1, 102--2.
- FIG. 19 is a diagram illustrating an example of the space-time encoding method according to the present embodiment.
- the space-time coding method is described in "Space-Time Block Codes from Orthogonal Designs" IEEE TRANSACTIONS ON INFORMATION THEORY, pp 1456-1467, vol.45, no.5, July 1999. It is.
- the base station apparatus 180 0 transmits the signal Si from the transmitting antenna 105 1 and the signal S 2 from the transmitting antenna 105 2 at time t, and transmits the signal S 2 at time t + T. Then, the signal -S 2 * is transmitted from the transmitting antenna 105-1, and the signal Si * (* is complex conjugate) is transmitted from the transmitting antenna 105-2.
- FIG. 20 shows a case where the base station apparatus 1800 performs the encoding shown in FIG.
- FIG. 3 is a diagram illustrating an example of a signal frame configuration. Note that in FIG. 20, portions common to FIG. 3 are denoted by the same reference numerals as in FIG. 3, and description thereof will be omitted.
- a frame of the transmission signal A is configured in the order of the channel estimation symbol 310, the guard symbol 302, the coded signal 2001, and the coded signal 2002.
- the transmission signal B, the guard symbol 3 5 1, channel estimation symbol 3 5 2, encoded signal 2 0 5 1, frame Ru consists of coded signals 2 0 5 2 order.
- Hl (t) represents the channel fluctuation received by the signal Si signal -S 2 * of the transmission signal A in FIG. 20 on the propagation path
- h2 (t) represents the channel fluctuation received by the signal S 2 of the transmission signal B and the signal Si * on the propagation path.
- the communication terminal device of the present embodiment has the same configuration as communication terminal device 200 of FIG. 2 described in Embodiment 1, and differs only in the processing content of signal processing unit 206.
- the signal processing unit 206 of the communication terminal device calculates the inverse matrix of the channel matrix of Expression (2) at the time of coded communication, and performs decoding by multiplying both sides of Expression (2) by the inverse matrix from the left side.
- the transmission signal Si demodulates the S 2.
- the base station apparatus encodes the signal and transmits the signal, so that the transmission signal vectors from the respective transmission antennas are orthogonal, and the communication terminal apparatus can demodulate the received signal without amplifying noise. it can.
- the communication terminal apparatus calculates the eigenvalue corresponding to the channel matrix of Equation (1), and calculates the received electric field strength and the average effective received electric field strength of the entire system. Then, it transmits to the base station apparatus.
- FIG. 21 shows a space-time coding scheme in the case of four transmitting antennas according to the present embodiment. It is a figure which shows an example of a method. This space-time coding method is described in "" Space-Time Block Coding for Wireless Communications: Performance Results "IEEE JOURNAL ON SELECTED AREAS IN
- the base station apparatus transmits signal group 2101 from each transmitting antenna at time t, transmits signal group 2102 from each transmitting antenna at time t + T, and transmits each signal at time t + 2T.
- Signal group 2103 is transmitted from the antenna, and signal group 2104 is transmitted from each transmitting antenna at time t + 3T.
- FIG. 22 is a diagram showing an example of a frame configuration of a transmission signal of the base station apparatus when the code method shown in FIG. 21 is performed.
- the same reference numerals as in FIG. 3 denote the same parts as in FIG. 3, and a description thereof will be omitted.
- transmission signal A is composed of a frame in the order of channel estimation symbol 2201, guard symbol 2202-1, 2202-2, 2202-3, coded signal 2203-1, 2203-2, 2203-3, 2203-4. Is configured.
- the transmission signal B is composed of guard symbol 2222-1, channel estimation symbol 2221, guard symbol 2222-2, 2222-3, and coded signals 2223-1, 2223-2, 2223-3, and 2223-4.
- the frames are configured in order.
- the transmission signal C is composed of guard symbols 2242-1, 2242-2, channel estimation estimation 2241, guard symphony 2242-3, coded signals 2243-1, 2243-2, 2243-3, and 2243-4.
- the frames are configured in order.
- the transmission signal D is composed of frames in the following order: guard symbols 2262-1, 2262-2, 2262-3, channel estimation symbol 2261, coded signals 2263-1, 2263-2, 2263-3, 2263-4. Be composed.
- FIG. 23 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station apparatus when the frequency-space coding method is applied in the case where the number of transmission antennas is 4 in the present embodiment.
- the signals are arranged in the time axis direction, whereas in FIG. 23, the signals are arranged in the frequency axis direction.
- FIG. 24 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device when the frequency-time-space-encoding method is performed in the case where the number of transmitting antennas is 4 in the present embodiment.
- FIG. 25 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station apparatus when the space-time encoding method is performed in the case where the number of transmission antennas is 4 in the present embodiment.
- FIG. 26 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device when the frequency-space coding method is performed in the case where the number of transmission antennas is 4 in the present embodiment.
- FIG. 27 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device when the frequency-time-space encoding method is performed in the case where the number of transmission antennas is 4 in the present embodiment.
- the encoding signals of the transmission signal A are al to a4
- the encoding signals of the transmission signal B are bl to b4
- the encoding signals of the transmission signal C are cl to c4
- the encoded signal of the transmission signal D is represented by dl to d4.
- the base station equipment can use any of the encoding methods shown in Figs. 25 to 27 based on the difference X between the received electric field strength of the entire system and the average effective received electric field strength.
- Figs. As shown in FIG. 7, frequency-time-space coding can be performed. As a result, orthogonality or pseudo-orthogonality between transmission signal vectors can be ensured by the receiving apparatus. In order to ensure orthogonality and quasi-orthogonality, it is better to suppress the spread of transmission signal vectors on the time axis and frequency axis as much as possible in order to increase channel correlation. For example, if arranged only on the time axis as shown in Fig. 22, the transmission signal betattle spreads on the time axis, and if arranged only on the frequency axis as shown in Fig.
- a large difference between the average effective received electric field strength and the received electric field strength of the entire system means that the difference between the eigenvalues is large and the vector correlation is high in the channel matrix.
- the correlation between channels is high, it is inefficient to separate and demodulate multiplexed signals in terms of effective use of signal power.
- the encoding section 1801 uses the same transmission signals A and B as shown in FIG. 28 instead of the frame configuration shown in FIG. Has a frame configuration in which the data symbol 280 1 is used.
- a signal is transmitted using a channel having a high correlation, a path diversity effect is obtained, signal power can be effectively used, and desired reception quality can be ensured.
- the transmission rate is reduced by half compared to the case where different data symbols are transmitted by the transmission signals A and B. Therefore, taking advantage of the high signal power, for example, by changing the modulation method of the transmission signal to increase the M-ary modulation value, or by increasing the coding rate R, without lowering the transmission rate of the transmission signal Can be sent.
- the present embodiment has been described using a space-time code as an encoding method, the present invention is not limited to this, and other codes such as a convolutional code, a turbo code, and an LDPC (Low Density Parity Check) code are used. The same can be applied to the dani method.
- codes such as a convolutional code, a turbo code, and an LDPC (Low Density Parity Check) code are used. The same can be applied to the dani method.
- the ninth embodiment can be combined with the first, third, fifth, and seventh embodiments.
- Embodiment 10 describes a case where, in single-carrier communication, switching between MIMO communication and coded communication is performed based on the received electric field strength and the effective received electric field strength of the entire system.
- FIG. 29 is a block diagram showing the configuration of the base station apparatus according to Embodiment 10.
- the same components as those of the base station apparatus 800 shown in FIG. 8 are assigned the same reference numerals as in FIG.
- the base station apparatus 2900 shown in FIG. 29 differs from the base station apparatus 800 shown in FIG. 8 in that the modulation method control section 155 is deleted and the coding method control section 295 1 and A configuration is adopted in which the encoding unit 29001 is followed by U.
- Demultiplexing section 154 outputs the first and second information symbols to coding method control section 295 1.
- the encoding method control unit 2951 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and The value of the average effective received electric field strength is read from it. Then, encoding method control section 2951 determines whether to perform MIMO communication or to perform encoded communication based on these values. Specifically, the encoding method control unit 2951 obtains the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and when the difference X is smaller than a predetermined threshold, the MIMO communication And if the difference X is equal to or greater than a predetermined threshold, it is determined that coded communication is to be performed. Then, encoding method control section 2951 outputs a communication method instruction signal instructing the determined communication method to encoding section 2901.
- the frame composing sections 101-1 and 101-2 each receive transmission digital data, insert a channel estimation symbol and a guard symbol into the transmission digital data, and generate a transmission digital signal. Output to the encoding unit 290 1.
- the encoding unit 290 1 receives the transmission digital signal and performs an encoding process when encoded communication is instructed by the communication method instruction signal from the encoding method control unit 295 1.
- the transmitted transmission digital signal is output to modulation sections 801-1-1 and 801-2.
- encoding section 290 1 receives a transmission digital signal and performs encoding processing when MIMO communication is instructed by a communication method instruction signal from encoding method control section 295 1. Instead, the transmission digital signal is output to the modulators 811-1, 8101_2.
- the communication terminal apparatus of the present embodiment has the same configuration as communication terminal apparatus 900 of FIG. 9 described in the second embodiment, and differs only in the processing performed by signal processing section 206.
- the signal processing unit 206 of the communication terminal device calculates the inverse matrix of the channel matrix of Expression (2) at the time of coded communication and multiplies both sides of Expression (2) by the inverse matrix from the left side to perform decoding. And demodulate the transmitted signal.
- the relative channel Control can be performed in consideration of such relationships, so that reception quality can be improved.
- the tenth embodiment can be combined with the second, fourth, sixth and eighth embodiments. it can.
- the base station apparatus transmits signals from a plurality of transmitting antennas and the communication terminal apparatus receives signals with the plurality of receiving antennas. And the case where the communication terminal device is reversed. Further, in each of the above embodiments, the communication terminal apparatus transmits the first and second information symbols to the base station apparatus, and the base station apparatus controls parameters such as a modulation method based on the first and second information symbols. However, according to the present invention, the communication terminal device determines the modulation method and the like of the base station device based on the first and second information symbols in the frame configuration unit, and provides information indicating the determined modulation method and the like. Is also transmitted to the base station apparatus.
- the present invention also allows the communication terminal apparatus to determine the average effective received electric field strength and the received electric field strength of the entire system in advance, and transmit the judgment result to the base station apparatus.
- the level is divided into four levels from "0" to "3"
- the communication terminal determines the level of the average effective received electric field strength and the received electric field strength of the entire system. And transmits the result of the determination to the base station apparatus as first and second information symbols.
- the base station apparatus controls parameters such as a modulation method based on the levels of the average effective received electric field strength and the received electric field strength of the entire system. As a result, the number of bits of the first and second information symbols can be reduced, so that transmission efficiency can be improved.
- the first and second information symbols can be represented by 2 bits.
- the modulation method and the like can be determined in consideration of other factors such as the state of the multipath, the Doppler frequency, the interference wave power and the like in addition to the effective received electric field strength.
- FIG. 31 is a block diagram showing a configuration of a base station apparatus according to Embodiment 11. Note that, in the base station device 3100 shown in FIG. 31, the same components as those of the base station device 1000 shown in FIG. 10 are denoted by the same reference numerals as in FIG. 10, and description thereof will be omitted.
- the base station apparatus 3100 shown in FIG. 31 differs from the base station apparatus 1000 shown in FIG. 10 in that the functions of the antenna control section 3151 and the frame forming sections 3101-1 and 3101-2 are different from those of the base station apparatus 1000 shown in FIG. It is different from 101-1 and 101-2.
- Each of the frame forming sections 3101-1 and 3101-2 generates an antenna identification information symbol indicating a transmission antenna determined by the antenna control section 3151, inputs transmission digital data, and adds channel estimation symbols and guards to the transmission digital data.
- a symbol and an antenna identification information symbol are input to generate a transmission digital signal, which is output to the SZP sections 102-1 and 102-2.
- FIG. 32 is a diagram illustrating an example of a frame configuration of a transmission signal of the base station device 3100.
- transmission signal A has a frame composed of channel estimation symbol 301, guard symbol 302, antenna identification information symbol 3201, and data symbol 303 in this order.
- transmission signal B has a frame composed of guard symbol 351, channel estimation symbol 352, antenna identification information symbol 3251, and data symbol 353.
- the communication terminal device of the present embodiment has the same configuration as communication terminal device 200 of FIG. 2 described in the first embodiment, and the processing of data separation units 204-1, 204-2 and frame configuration unit 254 is performed. Only the contents are different.
- Data separating sections 204-1 and 204-2 output antenna identification information to frame forming section 254, and frame forming section 254 inputs first and second information symbols and antenna identification information to transmission digital data. To generate a transmission digital signal.
- FIG. 33 is a diagram showing an example of a frame configuration of a transmission signal of the communication terminal apparatus according to the present embodiment.
- the transmission signal includes a first information symbol 501, a second information symbol 502, an antenna identification information symbol ⁇ / 3301, and a data symbol.
- a frame is configured in the order of the 503.
- the separation unit 154 in FIG. 31 separates the received digital signal into a data symbol (received digital data), a first information symbol, a second information symbol, and an antenna identification information symbol, and the first and second information symbols.
- the antenna identification information symbol is output to the antenna control section 3151.
- the antenna control unit 3151 receives the first and second information symbols and the antenna identification information symbol, reads the received electric field strength of the entire system from the first information symbol, and average effective received electric field strength from the second information symbol. Read the value of. Then, antenna control section 3151 determines whether or not to switch the transmitting antenna based on these values, and determines the transmitting antenna. Specifically, the antenna control unit 3151 determines the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and switches the transmitting antenna when the difference X is smaller than a predetermined threshold. If the difference X is equal to or greater than the predetermined threshold, it is determined that the transmission antenna is to be switched. Then, the antenna control section 3151 transmits the transmission antenna instruction signal indicating the determined transmission antenna to the antenna selection section 1001, the frame configuration section 3101-1-1, and 31011-12. Output to
- the antenna control unit 3 1 5 1 performs the processing in the case where the difference X is equal to or larger than the predetermined threshold until the antenna identification information symbol indicating the transmitting antenna after the switching is input. Even if there is, the switching of the transmission antenna is not performed. As a result, meaningless antenna switching can be prevented, and the communication terminal device can effectively use the received electric field strength.
- the frame configuration of the transmission signal of the base station device is not limited to that shown in FIG.
- the signal may be transmitted using the frame configuration shown in FIG.
- the frame of the signal transmitted from the transmitting antenna 105--1 is represented by the channel estimation symbol 3401, guard symbol 3402, guard symbol 3404, and data symbol 3404.
- the frame of the signal transmitted from the transmitting antenna 105-2 is divided into a guard symbol 3 4 2 1 and a channel. It consists of the estimated symbol 3422, guard symbol 3423, and data symbol 3424.
- a frame of a signal transmitted from the transmitting antenna 105-3 is composed of a guard symbol 3441, a guard symbol 3442, a channel estimation symbol 3443, and a data symbol 3444 in this order.
- Fig. 34 there are three pairs of transmitting antennas, G1 (105-1, 105-2), G2 (105-2, 105-3), and G3 (105-3, 105-1).
- the communication terminal receives the channel estimation symbols in this order (Gl, G2, G3), calculates the average effective received electric field strength and the received electric field strength of the entire system based on these channel estimated symbols, and changes the order. Sends the signal back to the base station without doing so.
- the antenna determination unit of the base station device compares the returned effective effective received electric field strength and the received electric field strength of the entire system without changing the order in which they are sent back. In addition, it is possible to determine a set that makes the reception quality of the received signal the best.
- a signal may be transmitted using the frame configuration shown in FIG.
- a frame of a signal transmitted from the transmitting antenna 105-1 is composed of the channel estimation symbols 3501, 3502, 3503, and 3504, the guard symbolons 3505 and 3506, and the data symbol 3507 in this order.
- the frame of the signal transmitted from the transmission antenna 105-2 is composed of the channel estimation symbols 352 1 and 3522, the guard symbolism 3523 and 3524, the channel estimation symbol 3525 and 3526, and the data symbol 3527 in this order.
- a frame of a signal transmitted from the transmission antenna 105-3 is composed of guard symbols 3541 and 3542, channel estimation symbols 3543, 3544, 3545, 3546, and data symbols 3547 in this order.
- FIG. 35 shows a method of transmitting orthogonal signals on two of the three transmitting antennas. For example, two signals (1, 1) and (1,-1) satisfy an orthogonal relationship. The orthogonal signals can be separated at the communication terminal device that receives them.
- the channel estimation symbol and the guard symbol are It is only necessary to use a configuration in which a set of transmitting antennas in which the modulated signal received by the receiving device is transmitted, or a configuration in which the transmitting order is known. For example, the order may be changed.
- the transmission antenna can be switched without forming the antenna identification information and the channel number information in the transmission frame.
- Embodiment 12 describes a case in which, in single-carrier communication using MIMO, the transmitting antenna is switched based on the received electric field strength and the effective received electric field strength of the entire system.
- FIG. 36 is a block diagram showing the configuration of the base station apparatus according to Embodiment 12. Note that, in the base station device 3600 shown in FIG. 36, the same components as those of the base station device 1100 shown in FIG. 11 are denoted by the same reference numerals as in FIG. 11, and description thereof is omitted.
- the base station apparatus 3600 shown in FIG. 36 is different from the base station apparatus 1100 shown in FIG. 11 in that the functions of the antenna control section 3651 and the frame configuration sections 3601-1-1 and 3601-2 are provided by the antenna control section 1 151 However, this is different from the frame constituent parts 101-1 and 101-2.
- the frame configuration units 3601-1-1 and 3601-2 each generate an antenna identification information symbol indicating the transmission antenna determined by the antenna control unit 3651, input the transmission digital data, and add a channel estimation symbol and a guard to the transmission digital data. A symbol and an antenna identification information symbol are inserted to generate a transmission digital signal, and this is output to modulation sections 801-1 and 801-2.
- the communication terminal device of the present embodiment has the same configuration as communication terminal device 200 of FIG. 2 described in the first embodiment, and the processing of data separation units 204-1, 204-2 and frame configuration unit 254 is performed. Only the contents are different.
- Data separation sections 204-1 and 204-2 output antenna identification information to frame configuration section 254, and frame configuration section 254 transmits first and second information symbols and antenna identification information to transmission digital data. To generate a transmission digital signal.
- the separation section 154 in FIG. 36 separates the received digital signal into data symbols (received digital data), a first information symbol, a second information symbol, and an antenna identification information symbol. Then, it outputs the antenna identification information symbol to antenna control section 3651.
- the antenna control unit 3 6 5 1 inputs the first and second information symbols and the antenna identification information symbol, reads the received electric field strength of the entire system from the first information symbol, and averages the effective reception from the second information symbol. Read the value of the electric field strength. Then, antenna control section 3651 determines whether or not to switch the transmitting antenna based on these values, and determines the transmitting antenna. Specifically, the antenna control section 3651 calculates the difference X between the received electric field strength of the entire system and the average effective received electric field strength, and switches the transmitting antenna when the difference X is smaller than a predetermined threshold. If the difference X is equal to or greater than the predetermined threshold, it is determined that the transmission antenna is to be switched. Then, the antenna control unit 3651 transmits the transmission antenna instruction signal indicating the determined transmission antenna to the antenna selection unit 1001, the frame configuration unit 36001-1, and 36001-2. Output to
- the antenna control unit 36651 performs switching of the transmitting antenna, and then inputs the antenna identification information symbol indicating the transmitting antenna after the switching, when the difference X is equal to or more than the predetermined threshold. Even if there is, the switching of the transmission antenna is not performed. As a result, meaningless antenna switching can be prevented, and the communication terminal device can effectively use the received electric field strength.
- Embodiment 13 describes a case where a receiving apparatus changes antenna characteristics based on the received electric field strength and the effective received electric field strength of the entire system in multicarrier communication. .
- FIG. 37 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 13.
- the transmitting apparatus 3700 is composed of a frame composing section 3700-1—1, 3700 1 _ 2, sign ⁇ 3702, 3? 3703-1 and 3703-2, IDFT sections 3704-1 and 3704-2, radio sections 3705-1 and 3705-2, and transmission antennas 3706-1 and 3706-2.
- the frame configuration sections 3701-1 and 3701-2 each receive the transmission digital data, insert a channel estimation symbol and a guard symbol into the transmission digital data, generate a transmission digital signal, and transmit the digital signal to the encoding section 3702. Output.
- Encoding section 3702 receives the transmission digital signal, performs an encoding process, and outputs the encoded transmission digital signal to S / P sections 3703-1 and 3703-2.
- the SZP section 37 ⁇ 3-1 receives the encoded transmission digital signal, performs serial / parallel conversion processing, performs modulation processing, and outputs the parallelized modulation signal to the IDFT section 3704-1.
- the S / P section 3703-2 receives the transmission digital signal, performs serial-to-parallel conversion processing, performs modulation processing, and outputs the parallelized modulated signal to the IDFT section 3704-2.
- the IDFT section 3704-1 receives the parallelized modulated signal, performs IDFT conversion processing to generate a transmission baseband signal, and outputs this to the radio section 3705-1.
- the IDFT section 374-2 receives the parallelized modulated signal, performs IDFT conversion processing to generate a transmission baseband signal, and outputs this to the radio section 37705-2.
- Radio section 37705-1 receives the transmission baseband signal, upconverts the signal, generates transmission signal A, and transmits the signal from transmission antenna 37706-1 by radio.
- Radio section 37705-2 receives the transmission baseband signal, up-converts the signal, generates transmission signal B, and transmits the signal from transmission antenna 37706-2 by radio.
- the frame structure of the transmission signal of base station apparatus 3700 is the same as that shown in FIG. Is the same as
- receiving apparatus 3800 includes receiving antennas 3801-1 and 3801-2, antenna characteristic changing sections 3802-1 and 3802-2, radio sections 3803-1 and 3803-2, DFT section 3804-1, 3804—2, Data separation unit 3805—1, 3805—2, Channel estimation unit 3806—1 to 3806_4, Signal processing unit 3807, Eigenvalue calculation unit 3808, Electric field intensity estimation unit 3809, Effective electric field intensity calculation And an antenna characteristic determining unit 3811.
- the antenna characteristic changing unit 3802_1 changes the antenna characteristics of the receiving antenna 3801-1 when the antenna judging unit 381 1 judges that the antenna characteristics need to be changed. -Output the signal received at 1 to the wireless section 3803-1.
- the antenna characteristic changing unit 3802-2 changes the antenna characteristics of the receiving antenna 3801-2 when the antenna characteristics determining unit 3811 determines that the antenna characteristics need to be changed, and receives it to the receiving antenna 3801-2.
- the output signal is output to the radio section 3803-2.
- the antenna characteristics include directivity, polarization, and the location of the antenna.
- Radio section 383-1 receives the received signal, down-converts the signal, generates a received baseband signal, and outputs this to DFT section 384-1.
- the f / F unit 3803-2 receives the received signal, down-converts the signal, generates a receive baseband signal, and outputs this to the DFT unit 3804-2.
- DFT section 3804-1 receives the received baseband signal, performs DFT conversion processing on the signal, and outputs the result to data separation section 3805-1.
- DFT section 380 4-2 receives the received baseband signal, performs DFT conversion processing on the signal, and outputs the result to data separation section 3805-2.
- the data separation unit 3805_1 converts the reception baseband signal received by the reception antenna 3801-1 and subjected to DFT conversion processing into a channel estimation symbol of the transmission signal A, The channel estimation symbol of the transmission signal B and the data symbol are separated, the channel estimation symbol of the transmission signal A is output to the channel estimation section 3806-1, and the channel estimation symbol of the transmission signal B is output to the channel estimation section 380-06. — 2 and output the data symbol to the signal processor 380 7.
- the data demultiplexing unit 3850-5-2 converts the reception baseband signal received by the reception antenna 3801-2 and subjected to DFT conversion processing into the channel estimation symbol for the transmission signal A, the channel estimation symbol for the transmission signal B, and The channel estimation symbol of the transmission signal A is output to the channel estimation unit 380-6-3, and the channel estimation symbol of the transmission signal B is output to the channel estimation unit 380-6_4. , And outputs the data symbol to the signal processing unit 380 7.
- the channel estimator 3806-1-1 inputs the channel estimation symbol of the received transmission signal A to the reception antenna 3801-1-1, performs channel estimation of the transmission signal A, and performs signal processing on the channel estimation value. Output to the section 380 7 and the eigenvalue calculation section 380 8.
- the channel estimator 3 806 _ 2 receives the channel estimation symbol of the transmission signal B received by the reception antenna 3 8 0 1-1, performs channel estimation of the transmission signal B, and performs signal processing on the channel estimation value. Output to the section 380 7 and the eigenvalue calculation section 380 8.
- the channel estimation unit 3806-6-3 receives the channel estimation symbol of the transmission signal A received by the reception antenna 3810-1-2, estimates the channel of the transmission signal A, and outputs the channel estimation value to the signal processing unit. It is output to 380 7 and the eigenvalue calculation section 380 8.
- the channel estimation unit 3806-6-4 receives the channel estimation symbol of the transmission signal B received by the reception antenna 3810-1-2, performs channel estimation of the transmission signal B, and outputs the channel estimation value to the signal processing unit. It outputs to 3807 and the eigenvalue calculator 3808.
- the signal processing unit 3807 calculates the inverse matrix of the channel matrix of the above equation (2), decodes the matrix by multiplying both sides of the equation (2) by the inverse matrix from the left side, and decodes the transmission signal Si, It demodulates the S 2.
- the signal processing unit 3807 does not necessarily need to use data from both the antennas 3801-1 and 3801-12-2, and demodulates the SS 2 using only data from one of them. be able to.
- the die The reception quality can be improved by obtaining the diversity gain.
- the eigenvalue calculator 38008 receives the channel estimation values of the transmission signals A and B, calculates the eigenvalue corresponding to the matrix formed by the channel estimation values, and calculates the eigenvalue as an effective electric field strength calculator 380 1 Output to 0.
- the electric field strength estimating unit 38009 receives the received baseband signal subjected to the DFT conversion processing, estimates the received electric field strength which is the square of the amplitude of each received baseband signal, and adds the estimated received electric field strength. By averaging, the received electric field strength of the entire system is obtained. Then, the electric field strength estimating section 380 9 outputs the received electric field strength corresponding to each received baseband signal to the effective electric field strength calculating section 380 10, and calculates the received electric field strength of the entire system as an antenna characteristic determining section 1 Output to 1.
- the effective electric field strength calculator 3810 inputs the received electric field strength and the eigenvalue corresponding to each received baseband signal, multiplies each received electric field strength by the minimum power of the eigenvalue to obtain the effective received electric field strength, and The average of the received electric field strength is obtained to obtain the average effective received electric field strength, and the average effective received electric field strength is output to the antenna characteristic determining section 3 8 11.
- Antenna characteristic determining section 3811 determines that it is necessary to change the characteristics of the receiving antenna when difference X between the average effective received electric field strength and the received electric field strength of the entire system is larger than a predetermined threshold. Then, antenna characteristic determining section 3811 outputs the result of the determination to antenna characteristic changing sections 38202-1 and 3802-2.
- the antenna characteristic determination unit 3811 may determine whether to change the antenna characteristic based on the eigenvalue. In this case, for example, the antenna characteristic determination unit 3811 calculates the eigenvalue of each subcarrier, adds the maximum value of each eigenvalue and the minimum value, and finds the difference between the added maximum value and minimum value. However, if the difference is larger than a predetermined threshold value, the correlation of the channel is high, and it is difficult to separate and demodulate the multiplexed signal and the reception characteristics deteriorate, so it is necessary to change the characteristics of the reception antenna. It is determined that there is.
- each configuration of the receiving apparatus 3800 according to the present embodiment is used.
- desired reception quality can be ensured by changing the characteristics of the reception antenna as necessary based on the reception electric field strength of the entire system and the effective reception electric field strength.
- Embodiment 14 describes a case in which a receiving apparatus changes antenna characteristics based on the received electric field strength and the effective received electric field strength of the entire system in multicarrier communication using MIMO.
- FIG. 39 is a block diagram showing the configuration of the transmitting apparatus according to Embodiment 14.
- transmitting apparatus 3900 includes frame forming sections 3901-1, 3901-2, SZP sections 3902-1, 3902-2, IDFT sections 3903-1, 3903-2, and radio section 3904-1, 3904-2, and transmission antennas 3905-1 and 3905-2.
- the frame configuration sections 3901-1 and 3901-2 receive the transmission digital data, insert a channel estimation symbol and a guard symbol into the transmission digital data, and generate a transmission digital signal.
- the SZP section 392-1 receives the encoded transmission digital signal, performs serial / parallel conversion processing, performs modulation processing, and outputs the parallelized modulated signal to the IDFT section 3903-1.
- the S / P section 3902-2 receives the transmission digital signal, performs serial-parallel conversion processing, performs modulation processing, and outputs the parallelized modulated signal to the IDFT section 3903-2.
- the IDFT unit 3903—1 receives the parallelized modulated signal and performs IDFT conversion. Processing is performed to generate a transmission baseband signal, which is output to the radio section 3904-1.
- the IDFT section 3903-2 receives the parallelized modulated signal, performs IDFT conversion processing to generate a transmission baseband signal, and outputs this to the radio section 3904-2.
- Radio section 394-1 receives a transmission baseband signal, up-converts the signal, generates transmission signal A, and transmits the signal from transmission antenna 3905-1 by radio.
- Radio section 3904-2 receives the transmission baseband signal, up-converts the signal, generates transmission signal B, and transmits this signal from transmission antenna 39905-2 without spring.
- the frame structure of the transmission signal of base station apparatus 3900 is the same as that shown in FIG.
- receiving apparatus 4000 includes receiving antennas 4001-1 and 4001-2, antenna characteristic changing sections 4002-1 and 4002-2, radio sections 4003-1 and 4003--2, and DFT section 4004-1. , 4004-2, data separation unit 4005-1, 4005-2, channel estimation unit 4006-1 to 4006-4, signal processing unit 4007, eigenvalue calculation unit 4008, electric field strength estimation unit 4009, effective It has an electric field strength calculation unit 4010 and an antenna characteristic determination unit 4011.
- the antenna characteristic changing section 4002-1 changes the antenna characteristic of the receiving antenna 4001-1 when the antenna characteristic determining section 401 1 determines that the antenna characteristic needs to be changed, and changes the receiving antenna 4001-1 to the receiving antenna 4001-1.
- the received signal is output to the line section 4003-1.
- the antenna characteristic changing unit 4002-2 changes the antenna characteristics of the receiving antenna 4001-2 when the antenna characteristic determining unit 401 1 determines that the antenna characteristics need to be changed, and
- the received signal is output to radio section 4003-2.
- Radio section 4003-1 receives the received signal, down-converts it to generate a received baseband signal, and outputs this to DFT section 4004-1.
- Radio section 4003- 2 receives the received signal, down-converts the signal, generates a receive base span signal, and outputs this to DFT section 4004-2.
- DFT section 4004-1 receives the received baseband signal, performs DFT conversion processing on the signal, and outputs the result to data separation section 4005-1.
- DFT section 4004-2 receives the received baseband signal, performs DFT conversion processing on the input baseband signal, and outputs the result to data separation section 4005-2.
- the data separation section 4005-1 separates the reception baseband signal received by the reception antenna 4001-1 and subjected to DFT conversion processing into a channel estimation symbol of the transmission signal A, a channel estimation symbol of the transmission signal B, and a data symbol, and
- the channel estimation symbol of A is output to channel estimation section 4006-1
- the channel estimation symbol of transmission signal B is output to channel estimation section 4006-2
- the data symbol is output to signal processing section 4007.
- the data separation section 4005--2 separates the reception baseband signal received by the reception antenna 4001-2 and subjected to DFT conversion processing into a channel estimation symbol of the transmission signal A, a channel estimation symbol of the transmission signal B, and a data symbol
- the channel estimation symbol of transmission signal A is output to channel estimation section 4006-3
- the channel estimation symbol of transmission signal B is output to channel estimation section 400.6-4
- the data symbols are output to signal processing section 4007.
- Channel estimation section 4006-1 receives the channel estimation symbol of transmission signal A received by reception antenna 4001-1, performs channel estimation of transmission signal A, and calculates the channel estimation value to signal processing section 4007 and eigenvalue calculation. Output to part 4008.
- Channel estimation section 4006- 2 receives the channel estimation symbol of transmission signal B received by reception antenna 4001-1, performs channel estimation of transmission signal B, and outputs the channel estimation value to signal processing section 4007 and eigenvalue calculation section 4008.
- Output to The channel estimation section 4006-3 inputs the channel estimation symbol of the transmission signal A received by the reception antenna 4001-2, performs channel estimation of the transmission signal A, The channel estimation value is output to signal processing section 4007 and eigenvalue calculation section 4008.
- the channel estimation unit 4006_4 receives the channel estimation symbol of the transmission signal B received by the reception antenna 4001-1-2, performs channel estimation of the transmission signal B, and outputs the channel estimation value to the signal processing unit. It is output to 4007 and the eigenvalue calculation section 4008.
- the signal processing unit 4007 demodulates the data symbol using the channel estimation value and generates received digital data.
- Eigenvalue calculation section 4008 receives channel estimation values of transmission signals ⁇ and ⁇ , calculates eigenvalues corresponding to a matrix formed by the channel estimation values, and calculates the eigenvalues as effective electric field strength calculation sections 410 Output to 0.
- the electric field strength estimator 409 receives the DF ⁇ converted reception baseband signals, estimates the reception electric field strength that is the square of the amplitude of each reception baseband signal, and adds the estimated reception electric field strength. Then, the received electric field strength of the entire system is obtained by averaging. Then, the electric field strength estimating section 409 outputs the received electric field strength corresponding to each received baseband signal to the effective electric field strength calculating section 410, and outputs the received electric field strength of the entire system to the antenna characteristic determining section 400. 1 Output to 1.
- the effective electric field strength calculator 4 0 10 inputs the received electric field strength and the eigenvalue corresponding to each received baseband signal, and multiplies each received electric field strength by the minimum power of the eigenvalue to obtain the effective received electric field strength.
- the average received electric field strength is obtained by averaging the received electric field strength, and the average effective received electric field strength is output to the antenna characteristic determination section 4101.
- the antenna characteristic determining unit 4101 determines that the characteristics of the receiving antenna need to be changed. Then, antenna characteristic determining section 4101 outputs the result of the determination to antenna characteristic changing sections 4002-1-2 and 4002-2.
- the antenna characteristic determination unit 4101 may determine whether or not to change the antenna characteristic 1 ”based on the unique characteristic. In this case, for example, the antenna characteristic determination unit 4101 Calculates the eigenvalue of each subcarrier, adds the maximum of each eigenvalue, and the minimum value, calculates the difference between the maximum value and the minimum value, and the difference is larger than a predetermined threshold. If it is high, the correlation of the channel is high, and it is difficult to separate and demodulate the multiplexed signal, and the receiving characteristics are degraded. Therefore, it is determined that the characteristics of the receiving antenna need to be changed.
- FIG. 41 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 15.
- the same components as those of the receiving apparatus 3800 shown in FIG. 38 are denoted by the same reference numerals as in FIG. 38, and description thereof will be omitted.
- the receiving apparatus 4100 shown in FIG. 41 the same components as those of the receiving apparatus 3800 shown in FIG. 38 are denoted by the same reference numerals as in FIG. 38, and description thereof will be omitted.
- receiving apparatus 4100 shown in FIG. 41 has a plurality of receiving antennas 3801-1 to 3801-1.
- the antenna controller 4102 determines the average effective received electric field strength and the received power of the entire system. If the difference X in the field strength is larger than a predetermined threshold value, it is determined that the receiving antenna needs to be switched. Then, antenna control section 4102 outputs the determination result to antenna selection sections 4101-1 and 4101-2.
- antenna control section 4102 may select a receiving antenna based on the eigenvalue.
- the antenna control unit 4102 calculates the eigenvalue of each subcarrier, adds the maximum values of the eigenvalues, and adds the minimum values of the eigenvalues, obtains the difference between the added maximum value and the minimum value, and If the difference is larger than a predetermined threshold, the correlation of the channel is high, and it is difficult to separate and demodulate the multiplexed signal and the receiving characteristics are degraded. Therefore, it is determined that it is necessary to switch the receiving antenna.
- the antenna selection section 4 1 0 1—1 selects a reception antenna from among the reception antennas 3 8 0 1—1 to 3 8 0 1—3, and transmits a signal received by the selected antenna to the radio section 3 8 0 3 -Output to 1.
- the antenna selection unit 4 1 0 1—2 selects a reception antenna from among the reception antennas 3 8 0 1—4 to 3 8 0 1—6, and transmits the signal received by the selected antenna to the radio unit 3 8 0 3 Output to _2.
- the antenna selection units 4101-1 and 4101-2 switch the reception antennas when the antenna control unit 4102 determines that the reception antennas need to be switched. As a method of switching the receiving antenna, a method of selecting the receiving antenna with the highest received electric field strength can be considered.
- desired reception quality can be obtained by switching the reception antennas as necessary based on the reception electric field strength and the effective reception electric field strength of the entire system. Can be secured.
- a signal received by a selected receiving antenna is down-converted to generate a receiving baseband signal.
- the present invention is not limited to this.
- Each of the signals may be down-converted to generate a reception baseband signal, and a selection may be made from among them.
- the transmission shown in FIG. In the transmitting apparatus 3700, the 3 ⁇ sections 3703-1 and 3703_2 are respectively replaced by modulation sections, and the IDFT sections 3704-1 and 3704-2 are replaced by spreading sections. Also, in receiving apparatus 4100 shown in FIG. 41, DFT sections 3804-1 and 3804-2 are each replaced with a despreading section.
- Embodiment 16 describes a case in which a receiving device switches a receiving antenna based on a received electric field strength and an effective received electric field strength of the entire system in multicarrier communication using MIMO.
- the configuration of the transmitting apparatus according to the present embodiment is the same as that of transmitting apparatus 3900 in FIG. 39 described in Embodiment 14, and a description thereof will not be repeated.
- FIG. 42 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 16.
- the receiving apparatus 4200 shown in FIG. 42 is different from the receiving apparatus 4000 shown in FIG. 40 in that the antenna characteristic changing sections 4002-1 and 4002-1 and the antenna characteristic determining section 401 1 are removed from the receiving apparatus 4000 and the antenna selecting section 4201— 1, 4201-2 and antenna control unit 4202 are added.
- the receiving apparatus 4200 illustrated in FIG. 42 includes a plurality of receiving antennas 4001-1 to 4001-6.
- the antenna control unit 4202 determines that it is necessary to switch the receiving antenna when the difference X between the average effective received electric field strength and the received electric field strength of the entire system is larger than a predetermined threshold. Then, antenna control section 4202 outputs the result of the determination to antenna selection sections 4201-1 and 4201-2.
- antenna control section 4202 may select a receiving antenna based on the eigenvalue.
- the antenna control unit 4202 calculates the eigenvalue of each subcarrier, adds the maximum value and the minimum value of each eigenvalue, obtains the difference between the added maximum value and minimum value, and determines the difference as a predetermined value. If the threshold value is larger than the threshold value, the channel correlation is high, and it is difficult to separate and demodulate the multiplexed signal, and the reception characteristics are poor. It is determined that the receiving antenna needs to be switched due to deterioration.
- Antenna selection section 4201-1 selects a reception antenna from among reception antennas 4001-1-4001-3, and outputs a signal received by the selected antenna to radio section 4003-1.
- Antenna selection section 4201-2 selects a reception antenna from among reception antennas 401-01-4 to 4001-6, and outputs a signal received by the selected antenna to radio sections 4003-12. Also, the antenna selection units 42 01-1 and 4201-2 switch the reception antenna when the antenna control unit 4202 determines that the reception antenna needs to be switched.
- desired reception quality can be obtained by switching the reception antennas as necessary based on the reception electric field strength and the effective reception electric field strength of the entire system. Can be secured.
- a signal received by a selected receiving antenna is down-converted to generate a receiving baseband signal.
- the present invention is not limited to this.
- Each of the signals may be down-converted to generate a reception baseband signal, and a selection may be made from among them.
- transmitting apparatus 3900 shown in FIG. The sections 3902_1 and 3902-2 are replaced with modulation sections, respectively, and the IDFT sections 3903-1 and 3903-2 are replaced with spreading sections. Also, in receiving apparatus 4200 shown in FIG. 42, DFT sections 4004-1 and 4004-2 are each replaced with a despreading section.
- Embodiment 17 describes a case in which antenna characteristics are changed based on the received electric field strength and the effective received electric field strength of the entire system in multicarrier communication using MIMO.
- the configuration of the communication terminal device according to the present embodiment is the same as communication terminal device 200 of FIG. 2 described in the first embodiment, and a description thereof will not be repeated.
- FIG. 43 is a block diagram showing the configuration of the base station apparatus according to Embodiment 17.
- the same components as those of the base station device 100 shown in FIG. 1 are denoted by the same reference numerals as those in FIG.
- the base station apparatus 4300 shown in FIG. 43 is different from the base station apparatus 100 shown in FIG. 1 in that the modulation method control section 1505 is deleted, and the antenna characteristic determining section 4351 and the antenna It adopts a configuration in which the characteristic change section 4 3 0 1-1 and 4 3 0 1-2 are added.
- Demultiplexing section 154 outputs the first and second information symbols to antenna characteristic determining section 435 1.
- the antenna characteristic determining unit 4351 receives the first and second information symbols, reads the received electric field strength of the entire system from the first information symbols, and reads the value of the average effective received electric field strength from the second information symbols. Then, the antenna characteristic determination unit 4351 determines that it is necessary to change the characteristics of the receiving antenna when the difference X between the average effective received electric field strength and the received electric field strength of the entire system is larger than a predetermined threshold. Then, antenna characteristic determining section 4351 outputs a control signal indicating the determination result (hereinafter, referred to as “antenna characteristic determining signal”) to antenna characteristic changing sections 4301-1 and 4301-12. I do.
- Muizumi section 104 L inputs the transmission baseband signal, upconverts it to generate transmission signal A, and outputs this to antenna characteristic changing section 4301-1.
- Radio section 1044-2 receives a transmission baseband signal, up-converts the signal, generates transmission signal B, and outputs the signal to antenna characteristic changing section 4301_2.
- the antenna characteristics changing unit 4 3 0 1-1 changes the antenna characteristics of the transmitting antenna 1 05 _ 1 when the antenna characteristics determining unit 4 3 5 1 determines that it is necessary to change the antenna characteristics.
- the transmission signal A is transmitted wirelessly.
- the antenna characteristic changing section 4301--2 changes the antenna characteristic of the receiving antenna 1055-2 when it is determined that the antenna characteristic needs to be changed by the antenna characteristic determining section 4351 Then, the transmission signal B is transmitted wirelessly.
- Embodiment 18 describes a case where the transmission power is changed based on the reception electric field strength and the effective reception electric field strength of the entire system in single carrier communication using MIMO.
- the configuration of the communication terminal device of the present embodiment is the same as communication terminal device 900 of FIG. 9 described in the second embodiment, and a description thereof will not be repeated.
- FIG. 44 is a block diagram showing the configuration of the base station apparatus according to Embodiment 18. Note that, in the base station apparatus 4400 shown in FIG. 44, the same components as those of the base station apparatus 800 shown in FIG. 8 are assigned the same reference numerals as in FIG.
- the base station apparatus 4400 shown in FIG. 44 differs from the base station apparatus 800 shown in FIG. 8 in that the modulation method control section 1555 is deleted, the antenna characteristic determination section 4451 and the antenna are removed. It adopts a configuration in which the characteristic change section 4 4 0 1-1 and 4 4 0 1-2 are added.
- Separating section 154 outputs the first and second information symbols to antenna characteristic determining section 4451.
- the antenna characteristic determining unit 4 4 5 1 inputs the first and second information symbols, reads the received electric field strength of the entire system from the first information symbol, and reads the value of the average effective received electric field strength from the second information symbol. . Then, the antenna characteristic determining unit 4451 determines that it is necessary to change the characteristics of the receiving antenna when the difference X between the average effective received electric field strength and the received electric field strength of the entire system is larger than a predetermined threshold. Then, antenna characteristic determining section 4451 outputs an antenna characteristic determining signal indicating the determination result to antenna characteristic changing sections 4401-1 and 4401-2.
- the radio section 1044-1 receives the transmission baseband signal, upconverts it to generate a transmission signal A, and outputs this to the antenna characteristic changing section 4401-1. I do.
- Radio section 1044-2 receives the transmission baseband signal, up-converts the signal, generates transmission signal B, and outputs this to antenna characteristic changing section 444-1-2.
- the antenna characteristic changing section 4401-1 changes the antenna characteristic of the transmitting antenna 1055-1 when the antenna characteristic determining section 4451 determines that the antenna characteristic needs to be changed. Transmit the transmission signal A wirelessly.
- the antenna characteristic changing unit 4401_1 changes the antenna characteristics of the receiving antenna 1055-2 when it is determined that the antenna characteristics need to be changed by the antenna characteristic determining unit 4451, Transmits transmission signal B wirelessly.
- the relative distance between the channels can be improved. Since control can be performed in consideration of such a relationship, reception quality can be improved.
- the number of transmitting antennas and the number of receiving antennas are not limited.
- the OFDM scheme has been described as an example of the multicarrier scheme
- the CDMA scheme has been described as an example of the single carrier.
- the present invention is not limited to this.
- the reception field strength is estimated from the signal after DFT or the signal power after despreading, but the present invention is not limited to the method for estimating the reception field strength.
- the parameter is controlled based on the difference between the average effective received electric field strength and the received electric field strength of the entire system.
- the parameters can be controlled by a method using the average effective received electric field strength, such as the ratio of the received electric field strength of the entire system.
- parameter control may be performed based on a difference between an eigenvalue corresponding to a difference between the average effective reception electric field strength and the reception electric field strength of the entire system.
- the modulation method and the like are determined based on the reception electric field strength of the entire system and the effective reception electric field strength.
- the parameters such as the modulation method can be controlled in consideration of the relative relationship between the channels, and the reception quality can be improved.
- the present invention is suitable for use in a communication device of a system that performs wireless communication using a plurality of antennas for both transmission and reception.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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AU2003284444A AU2003284444A1 (en) | 2002-11-26 | 2003-11-26 | Communication method, transmitter apparatus and receiver apparatus |
CN200380100621.7A CN1692574B (zh) | 2002-11-26 | 2003-11-26 | 通信方法、发送设备以及接收设备 |
US10/516,936 US7206606B2 (en) | 2002-11-26 | 2003-11-26 | Wireless communication including diversity transmission and reception |
EP03775880.2A EP1511189B1 (en) | 2002-11-26 | 2003-11-26 | Communication method, transmitter apparatus and receiver apparatus |
US11/613,245 US8285332B2 (en) | 2002-11-26 | 2006-12-20 | Communication method, transmission apparatus and reception apparatus |
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JP2002342019 | 2002-11-26 | ||
JP2002-354102 | 2002-12-05 | ||
JP2002354102 | 2002-12-05 | ||
JP2003008002 | 2003-01-16 | ||
JP2003-8002 | 2003-01-16 | ||
JP2003041133 | 2003-02-19 | ||
JP2003-41133 | 2003-02-19 | ||
JP2003-78037 | 2003-03-20 | ||
JP2003078037 | 2003-03-20 |
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US10516936 A-371-Of-International | 2003-11-26 | ||
US11/613,245 Division US8285332B2 (en) | 2002-11-26 | 2006-12-20 | Communication method, transmission apparatus and reception apparatus |
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PCT/JP2003/015057 WO2004049596A1 (ja) | 2002-11-26 | 2003-11-26 | 通信方法及び送信装置、受信装置 |
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US (2) | US7206606B2 (ja) |
EP (1) | EP1511189B1 (ja) |
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Also Published As
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US20070087701A1 (en) | 2007-04-19 |
US8285332B2 (en) | 2012-10-09 |
EP1511189A4 (en) | 2011-06-29 |
EP1511189A1 (en) | 2005-03-02 |
EP1511189B1 (en) | 2017-09-06 |
US7206606B2 (en) | 2007-04-17 |
US20050181737A1 (en) | 2005-08-18 |
AU2003284444A1 (en) | 2004-06-18 |
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