WO2000002359A1 - Emetteur et recepteur et procede de transmission de donnees - Google Patents
Emetteur et recepteur et procede de transmission de donnees Download PDFInfo
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- WO2000002359A1 WO2000002359A1 PCT/JP1999/003609 JP9903609W WO0002359A1 WO 2000002359 A1 WO2000002359 A1 WO 2000002359A1 JP 9903609 W JP9903609 W JP 9903609W WO 0002359 A1 WO0002359 A1 WO 0002359A1
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- signal
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- cells
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Classifications
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
-
- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0032—Without explicit signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/183—Multiresolution systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3488—Multiresolution systems
-
- 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
- H04L2001/0098—Unequal error protection
Definitions
- the present invention relates to a transmission device, a reception device, and a data transmission method that are mounted on a wireless communication device and that change a data transmission rate according to a line condition.
- FIG. 1A and 1B are block diagrams showing a configuration of a wireless communication device in a conventional TDD transmission scheme.
- FIG. 1A is a block diagram showing a configuration of a side that transmits data by adaptively controlling a data transmission rate (hereinafter referred to as a “transmission side”).
- FIG. 1B is a block diagram showing an adaptive control of a data transmission rate.
- FIG. 2 is a block diagram illustrating a configuration of a side that receives the received data (hereinafter, referred to as a “reception side”).
- the transmission side of the wireless communication device shown in Fig. 1A includes a data buffer 1 that temporarily stores the transmission signal, a modulator 2 that performs BPSK modulation on the transmission signal, and a modulation that performs QPSK modulation on the transmission signal.
- Modulator 3 a modulator 4 that performs 16 Q AM modulation on the transmitted signal, an amplifier 5 that amplifies the modulated signal, an antenna 6 that wirelessly transmits and receives the signal, and an antenna 6 that receives the signal from the antenna 6.
- an amplifier 22 that amplifies the received signal
- a demodulator 23 that performs BPSK demodulation on the received signal
- a demodulator 24 that performs QPSK demodulation on the received signal
- Demodulator 25 that performs demodulation
- a buffer 26 that stores the demodulated signal
- BPSK demodulator 27 It is mainly composed of a BPSK demodulator 27, a rate detector 28 for detecting a data transmission rate from the output of the BPSK demodulator 27, and switches 29 and 30 controlled to be switched by the rate detector 28.
- the level of the received signal can be measured on the transmitting side, and the modulation method of the transmitted signal can be selected based on the level of the received signal. it can.
- the rate selector 8 on the transmitting side determines that the line condition is good when the level of the received signal is large, selects a modulation method such as 16QAM that is prone to error but has a high data transmission rate, and controls the switches 9 and 10, If the level is low, it is determined that the line condition is bad, and the switches 9 and 10 are controlled by selecting a modulation method such as BPSK that has a low data transmission rate but is less error-prone. Further, the rate selector 8 stores the rate selection information in the data buffer 1.
- a modulation method such as 16QAM that is prone to error but has a high data transmission rate
- the transmission signal stored in the data buffer 1 is modulated by the modulation method selected by the rate selector 8.
- the rate selection information is always modulated by the BPSK method in order to reduce errors.
- the modulated signal is amplified by the amplifier 5 and then transmitted wirelessly from the antenna 6.
- the signal received by the receiving antenna 21 is amplified by the amplifier 22 and then B
- the PSK demodulator 27 extracts the rate selection information, and the rate detector 28 detects the data transmission rate. Then, based on the detected data transmission rate, switches 29 and 30 are switch-controlled, and the received signal is demodulated by the demodulation method of the same data transmission rate as the modulation method. After the demodulation result is stored in the buffer 26, It is extracted as a received signal.
- FIG. 2 is a block diagram showing a configuration of a wireless communication device in a conventional FDD transmission system.
- FIG. 2A shows the configuration on the transmitting side
- FIG. 2B shows the configuration on the receiving side.
- the same components as those in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and description thereof will be omitted.
- the level of the received signal is measured on the receiving side, and the modulation method of the transmitted signal is selected based on the level of the received signal.
- the transmitting side of the wireless communication apparatus shown in FIG. 2 is different from FIG. 1 in that an amplifier 11 for amplifying a received signal and rate selection information from the received signal are used instead of the level measuring device 7 and the rate selector 8. And a rate detector 13 for detecting the data transmission rate from the rate selection information.
- the receiving side selects a data transmission rate from the reception level and a level measuring instrument 31 that measures the received signal level, and sets the data transmission rate.
- the rate selector 32 on the receiving side determines that the line condition is good when the level of the received signal is high, selects a modulation method such as 16 QAM that is error-prone but has a high data transmission rate, and modulates the rate selection information. Output to 3 In addition, the rate selector 32 determines that the line condition is inferior when the received signal level is low, selects a modulation method such as BPSK that has a low data transmission rate but is not error-prone, and modulates the rate selection information. Output to 3 The rate selection information is modulated by the modulator 33 according to the BPSK method, which is a modulation method in which an error is unlikely to occur, amplified by the amplifier 34, and then transmitted from the antenna 21 to the transmitting side.
- BPSK method which is a modulation method in which an error is unlikely to occur
- the rate selector 32 outputs the rate selection information and simultaneously switches 29, 30 are prepared to perform demodulation corresponding to the specified data transmission rate. After the demodulation result is stored in the data buffer 26, it is extracted as a received signal.
- the signal received by the transmitting-side antenna 6 is amplified by the amplifier 11 and then demodulated by the demodulator 12 to extract rate selection information. Then, the rate detector 13 detects the data transmission rate from the rate selection information, controls the switches 9 and 10, and determines the data transmission rate of the transmission signal.
- the transmission signal is temporarily stored in the data buffer 1, modulated by the BPSK modulator 2, the QPSK modulator 3, or the 16 QAM modulator 4 under the control of the rate detector 13. After being amplified, it is transmitted from the antenna 6 to the receiving side.
- the conventional wireless communication apparatus that adaptively controls the data transmission rate improves the transmission efficiency by using a modulation scheme with a high transmission rate when the line conditions are good, and the line conditions are poor.
- the data transmission rate is low, but the data is transmitted reliably using a modulation method that is less error prone, thereby increasing the average data transmission efficiency.
- the above-described conventional wireless communication apparatus has to transfer rate selection information between the transmitting side and the receiving side, and has a problem that if the rate selecting information is incorrect, the transmission efficiency is rather lowered.
- the reception level alone is not sufficient as a material for determining the line status, and the accuracy of estimating the reception quality deteriorates.
- the transmission efficiency cannot be improved sufficiently because the line conditions at the time of rate selection and at the time of signal transmission change. Disclosure of the invention
- An object of the present invention is to check the line status without transferring the rate selection information. It is another object of the present invention to provide a transmitting apparatus, a receiving apparatus, and a data transmission method for automatically switching a data transmission rate.
- the purpose is to distribute the transmission signal to multiple layers on a cell-by-cell basis, perform encoding processing that can detect errors for each layer, and then perform hierarchical modulation on the transmission side, and then transmit the received signal to the reception side. This is achieved by demodulating, performing error detection for each layer, and requesting retransmission for each layer.
- FIGS. 1A and 1B are block diagrams showing a configuration of a wireless communication device that performs adaptive modulation in conventional TDD transmission.
- FIGS. 2A and 2B are block diagrams showing a configuration of a wireless communication device that performs adaptive modulation in conventional FDD transmission.
- 3A and 3B are block diagrams showing a configuration of a wireless communication device according to Embodiment 1 of the present invention.
- 4A and 4B are schematic diagrams showing signal point constellations of hierarchical modulation in QPSK modulation.
- 5A and 5B are block diagrams showing a configuration of a wireless communication apparatus according to Embodiment 2 of the present invention.
- 6 and 7 are flowcharts showing processing operations of the transmission controller of the wireless communication device according to Embodiment 2 of the present invention.
- FIG. 8 is a schematic diagram showing cells written to a TMP buffer of each layer of the wireless communication device according to the second embodiment of the present invention.
- 9A and 9B are block diagrams showing a partial configuration of a wireless communication device according to Embodiment 3 of the present invention.
- FIG. 1 OA and FIG. 10B are block diagrams each showing a partial configuration of a wireless communication apparatus according to Embodiment 4 of the present invention.
- FIGS. 11A and 1IB are block diagrams showing a partial configuration of a wireless communication apparatus according to Embodiment 5 of the present invention.
- FIG. 12A and FIG. 12B are block diagrams each showing a partial configuration of the wireless communication apparatus according to Embodiment 6 of the present invention.
- FIG. 3 is a block diagram showing a configuration of the wireless communication device according to Embodiment 1 of the present invention.
- FIG. 3A shows a side that transmits data after hierarchical modulation (hereinafter referred to as “transmitting side”)
- FIG. 3B shows a side that receives hierarchically modulated data (hereinafter “receiving side”). ).
- the transmitting side of the wireless communication apparatus shown in FIG. 3A includes an encoder 101 that performs error detection encoding on a transmission signal, and a data buffer 102 that temporarily stores the encoded transmission signal.
- a hierarchical modulator 103 that performs hierarchical modulation on the encoded signal, an amplifier 104 that amplifies the hierarchically modulated signal, an antenna 105 that transmits and receives the signal, and retransmission from the receiving side. It mainly comprises an amplifier 106 for amplifying the request signal and a demodulator 107 for demodulating the retransmission request signal.
- the receiving side shown in FIG. 3B includes an antenna 151 for transmitting and receiving signals, an amplifier 152 for amplifying the received signal, a hierarchical demodulator 1553 for performing hierarchical demodulation on the amplified received signal, Error detectors 15 4 and 15 5 that detect errors in the received signal, data buffers 15 7 that temporarily store the received signal, modulators 15 8 that modulate the retransmission request signal, and a retransmission request signal It is mainly composed of an amplifier 159 and an amplifier.
- the encoder 101 on the transmission side distributes the transmission signal into a plurality of layers in cell units, performs encoding so that error detection can be performed for each layer, and stores the data in the data buffer 102.
- the cells allocated to each layer are hierarchically modulated by the hierarchical modulator 103,
- the signal is amplified by the amplifier 104 and transmitted from the antenna 105.
- the hierarchical modulation is a method of modulating the quality of a plurality of signals transmitted on the same line with a difference in signal point arrangement.
- FIG. 4A shows a signal point constellation for normal QPSK modulation.
- the quality of the I component is the same as the quality of the Q component because the distance 201 between the signal points of the I component and the distance 202 of the signal points of the Q component are equal.
- FIG. 4B shows a signal point arrangement of QPSK modulation that has been subjected to hierarchical modulation processing.
- the signal received by the antenna 151 is amplified by the amplifier 152, hierarchically demodulated by the hierarchical demodulator 153, and the cell of each hierarchy is taken out.
- the hierarchically modulated cells are subjected to error detection processing for each layer by error detectors 154 and 155, and a retransmission request signal for the cell in which the error is detected is output.
- the retransmission request signal is transmitted to modulator 1
- the signal is modulated by 58, amplified by amplifier 159, and transmitted from antenna 151.
- the retransmission request signal transmitted from the receiving side is detected by the demodulator 107 via the antenna 105 and the amplifier 106, and output to the data buffer 102. Then, the cell requested to be retransmitted is automatically read out from the buffer 102 again and retransmitted.
- the cell is discarded.
- the transmission side distributes the transmission signal to a plurality of layers in cell units, performs encoding processing that can detect errors for each layer, performs layer modulation, and performs error detection for each layer on the reception side.
- the data transmission rate can be automatically and adaptively controlled according to the line conditions without passing the rate selection information.
- Embodiment 1 describes the case where the number of layers is two, the present invention is not limited to the number of layers and any number of layers may be used.
- FIG. 5 is a block diagram showing a configuration of the wireless communication device according to the second embodiment.
- FIG. 5A shows the transmitting side
- FIG. 5B shows the receiving side. Note that, in FIG. 5, the same components as those in FIG. 3 are denoted by the same reference numerals as those in FIG.
- the transmission side of the wireless communication apparatus shown in FIG. 5 includes a transmission controller 301 for controlling the layer of the transmission signal and a TMP buffer 302 for temporarily storing cells. 0 3 and 3 0 4 are added.
- FIG. 3 shows a case where the number of layers is two
- FIG. 5 shows a case where the number of layers is three.
- the transmission controller 301 controls the layer of each cell stored in the data buffer 102 and stores it in the buffer 302, 303, 304. In addition, the cells written to the data buffer 102 and the TMP buffers 302, 303, and 304 are erased. When a retransmission request signal is input from the demodulator 107, the corresponding cell is written to a TMP buffer different from the previous one, thereby controlling the retransmitted cell to be transmitted in a different layer from the previous one.
- the transmission cell input from the data buffer 102 is written into the empty TMP buffers 302, 303, 304 (ST402).
- the cells written in each TMP buffer are hierarchically modulated by the hierarchical modulator 103, amplified in amplitude by the amplifier 104, and transmitted wirelessly from the antenna 105.
- the cell is written one rank higher than the previously transmitted layer into the TMP buffer (ST408, ST409).
- the corresponding cell is deleted from data buffer 102 (ST410).
- the cell is written to the TMP buffer of layer 1 (ST417).
- FIG. 8 is a schematic diagram showing cells written in the TMP buffers of each layer of the wireless communication device according to the second embodiment.
- the cell Pl is written in the hierarchy 1
- the cell P2 is written in the hierarchy 2
- the cell P3 is written in the hierarchy 3.
- F505 As a result of the transmission in F505, if an error occurs in all layers 2 on the receiving side, retransmission requests for all layers are issued to the transmitting side.
- cell P10 is written to layer 1
- cell P11 is written to layer 2
- cell 8 is written to layer 3 according to the retransmission request.
- the number of layers and the control algorithm are not limited. Also, in Embodiment 2, the layer for writing cells is increased by one each time retransmission is performed, but other controls such as unconditionally increasing the layer for writing cells to be retransmitted to layer 1 may be performed. it can.
- FIG. 9 is a block diagram showing a partial configuration of a wireless communication device according to Embodiment 3 of the present invention.
- FIG. 9A shows a configuration of a hierarchical modulator of the wireless communication device
- FIG. 9B shows a configuration of a hierarchical demodulator of the wireless communication device.
- Hierarchical modulator 103 shown in FIG. 9A includes a plurality of spreaders 600, 602, and 603 that perform spreading processing, and an adder 60 that adds spread signals output from each spreader. 4 and a modulator 605 for modulating the added spread signal.
- the hierarchical demodulator 1 23 shown in FIG. 9B is composed of a plurality of despreaders 651, 652, 653 that perform despreading processing, and RAKE synthesis of the output of each despreader.
- An AKE receiver 65 54, 65 55, 65 56 is provided.
- Spreader 6001 performs spreading processing on cells allocated to layer 1 using spreading code A, and amplifies the spread signal based on level setting signal A.
- spreader 62 performs spreading processing on cells allocated to layer 2 using spreading code B, and amplifies the spread signal based on level setting signal B.
- spreader 603 performs spreading processing on cells allocated to layer 3 using spreading code C, and amplifies the spread signal based on level setting signal C.
- level setting signal A In order to provide a quality difference between the layers, different levels are designated for the level setting signal A, the level setting signal B, and the level setting signal C, respectively.
- spreading code A, spreading code B, and spreading code C have orthogonality to one another.
- the spread signals output from the respective spreaders are added by an adder 604 and then modulated by a modulator 605 to be output from the hierarchical modulator 103 as a hierarchical modulation output.
- the despreader 651 performs despreading on the input signal with the same spreading code A used in the spreading process of the spreader 601, and extracts cells allocated to layer 1.
- the RAKE combiner 654 performs RAKE combining on the cells output from the despreader 651.
- despreader 652 performs despreading on the input signal with the same spreading code B used in the spreading process of spreader 602, and extracts cells allocated to layer 2.
- the RAKE combiner 655 combines the cells output from the despreader 652 with RAKE.
- despreader 653 performs despreading on the input signal with the same spreading code C used in the spreading process of spreader 603, and extracts cells allocated to layer 3.
- the RAKE combiner 656 combines the cells output from the despreader 653 with RAKE.
- the transmission rate can be automatically switched according to the line conditions without passing rate selection information between the transmitting side and the receiving side.
- FIG. 10 is a block diagram showing a partial configuration of the wireless communication apparatus according to Embodiment 4 of the present invention.
- FIG. 10A shows the configuration of the hierarchical modulator of the wireless communication device
- FIG. 10B shows the configuration of the hierarchical demodulator of the wireless communication device.
- the hierarchical modulator 103 shown in Fig. 1 OA includes a plurality of modulators 701, 702, 703 that modulate using different subcarriers, and a modulation signal output from each modulator. And an adder 704 for adding.
- the hierarchical demodulator 123 shown in FIG. 10B includes a plurality of demodulators 751, 752, and 753 that perform demodulation processing.
- the modulator 701 performs a modulation process on the cells allocated to the layer 1 using the subcarrier A, and amplifies the modulated signal based on the level setting signal A.
- modulator 702 performs modulation processing on cells allocated to layer 2 using subcarrier B, and amplifies the modulated signal based on level setting signal B.
- modulator 703 performs a modulation process on the cells allocated to layer 3 using subcarrier C, and amplifies the modulated signal based on level setting signal C.
- level setting signal A the level setting signal B, and the level setting signal C, respectively.
- subcarrier A, subcarrier B, and subcarrier C specify different subcarriers so as to maintain orthogonality with each other.
- the signals output from the modulators are added by an adder 704 and output from the hierarchical modulator 103 as a hierarchical modulation output.
- the demodulator 751 performs demodulation processing on the input signal with the same subcarrier A as the modulation processing of the modulator 701, and extracts cells allocated to the layer 1.
- demodulator 752 performs demodulation processing on the input signal using subcarrier B, which is the same as the modulation processing of modulator 72, and extracts cells allocated to layer 2.
- the demodulator 735 performs demodulation processing on the input signal with the same subcarrier C as the modulation processing of the modulator 703, and extracts cells allocated to the layer 3.
- FIG. 11 is a block diagram showing a partial configuration of a wireless communication apparatus according to Embodiment 5 of the present invention.
- FIG. 11A shows the configuration of the hierarchical modulator of the wireless communication device
- FIG. 11B shows the configuration of the hierarchical demodulator of the wireless communication device.
- the hierarchical modulator 103 shown in FIG. 11A includes a plurality of mappers 801, 802, 803 that perform different mapping processes, and a connection switch 80, which adjusts the output timing of each mapper. 4, 805, 806, an adder 807 for adding the mapped signal, and a modulator 808 for modulating the added signal.
- the hierarchical demodulator 123 shown in FIG. 11B includes a plurality of demodulators 851, 852, 853 that perform demodulation processing.
- the mapper 8001 performs mapping by BPSK modulation on cells allocated to layer 1. Similarly, mapper 802 performs mapping by QPSK modulation on cells allocated to layer 2. In addition, mapping device 803 maps sub-carrier C to cells allocated to layer 3.
- each mapper is output to the adder 807 at different times by controlling the connection switches 804, 805, and 806 of the timing signal A, timing signal B, and evening signal C.
- the modulator 8 The signal is modulated at 08 and output from the hierarchical modulator 103 as a hierarchical modulation output. In this way, by outputting signals with different mappings at different times, signals with different qualities depending on time can be transmitted.
- the demodulator 851 performs demodulation processing on the input signal using the timing signal A, and extracts cells allocated to the first layer.
- demodulator 852 performs demodulation processing on the input signal using timing signal B, and extracts cells allocated to layer 2.
- the demodulator 8553 performs demodulation processing on the input signal using the timing signal C, and extracts cells allocated to the layer 3.
- the data transmission rate can be automatically switched according to the line condition without passing the rate selection information between the transmitting side and the receiving side.
- FIG. 12 is a block diagram showing a partial configuration of a wireless communication apparatus according to Embodiment 6 of the present invention.
- FIG. 12A shows the configuration of the hierarchical modulator of the wireless communication device
- FIG. 12B shows the configuration of the hierarchical demodulator of the wireless communication device.
- the hierarchical modulator 103 shown in FIG. 12A includes a plurality of spreaders 910, 902, 903 that perform spreading processing, and connection switches 904 that adjust the output timing of each spreader. 905, 906, an adder 907 for adding each spread signal, and a modulator 908 for modulating the added spread signal.
- the hierarchical demodulator 1 23 shown in FIG. 12B combines a plurality of despreaders 951, 952, and 953 that perform despreading processing with the output of each despreader in RAKE It has a RAKE receiver 954, 955, 956.
- Spreader 9101 performs spreading processing on cells allocated to layer 1 using spreading code A, and amplifies the spread signal based on level setting signal A.
- spreader 902 expands cells assigned to layer 2 using spreading code B. The spread processing is performed, and the spread signal is amplified based on the level setting signal B.
- spreader 903 performs spreading processing on cells allocated to layer 3 using spreading code C, and amplifies the spread signal based on level setting signal C.
- the spreading code A, the spreading code B, and the spreading code C have different spreading factors, respectively, in order to give a quality difference to each layer.
- the level setting signal A, the level setting signal B, and the level setting signal C may be used in combination to specify different levels. Assuming that all transmission levels are constant, the higher the spreading factor, the better the signal quality.
- the spread signals output from each spreader are output to the adder at different times by controlling the connection switches 904, 905, and 906 of the timing signals A, B, and C.
- the signal After being added by the adder 907, the signal is modulated by the modulator 908, and output from the hierarchical modulator 103 as a hierarchical modulation output.
- the despreader 951 performs despreading on the input signal with the same spreading code A used in the spreading process of the spreader 901, and extracts cells allocated to layer 1.
- RAKE combiner 954 combines the cells output from despreader 951 with RAKE.
- despreader 952 performs despreading on the input signal with the same spreading code B used in the spreading process of spreader 902, and extracts cells allocated to layer 2.
- RAKE combiner 955 combines the cells output from despreader 952 with RAKE.
- despreader 953 despreads the input signal with the same spreading code C used in the spreading process of spreader 903, and extracts cells allocated to layer 3.
- RAKE combiner 956 combines the cells output from despreader 9553 with RAKE.
- the transmitting side distributes a transmission signal to a plurality of layers on a cell-by-cell basis, and performs encoding that can detect an error for each layer.
- the data transmission rate can be automatically changed according to the line status. This makes it possible to avoid malfunction due to an error in the control signal, to cope with high-speed fading, and to eliminate the need to consider the estimation accuracy of the reception quality.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU43972/99A AU4397299A (en) | 1998-07-07 | 1999-07-05 | Transmitter and receiver and data transmission method |
KR1020007002366A KR20010023712A (ko) | 1998-07-07 | 1999-07-05 | 송신 장치, 수신 장치 및 데이터 전송 방법 |
CA002301226A CA2301226A1 (en) | 1998-07-07 | 1999-07-05 | Transmitting apparatus and receiving apparatus and data transmitting method |
EP99926926A EP1011245A1 (en) | 1998-07-07 | 1999-07-05 | Transmitter and receiver and data transmission method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP10/192078 | 1998-07-07 | ||
JP10192078A JP2000031944A (ja) | 1998-07-07 | 1998-07-07 | 送信装置並びに受信装置及びデータ伝送方法 |
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WO2000002359A1 true WO2000002359A1 (fr) | 2000-01-13 |
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PCT/JP1999/003609 WO2000002359A1 (fr) | 1998-07-07 | 1999-07-05 | Emetteur et recepteur et procede de transmission de donnees |
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EP (1) | EP1011245A1 (ja) |
JP (1) | JP2000031944A (ja) |
KR (1) | KR20010023712A (ja) |
CN (1) | CN1273732A (ja) |
AU (1) | AU4397299A (ja) |
CA (1) | CA2301226A1 (ja) |
WO (1) | WO2000002359A1 (ja) |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001268049A (ja) | 2000-03-15 | 2001-09-28 | Matsushita Electric Ind Co Ltd | データ伝送装置及びデータ伝送方法 |
KR100434459B1 (ko) * | 2000-06-27 | 2004-06-05 | 삼성전자주식회사 | 이동통신 시스템에서 패킷의 전송 제어방법 및 장치 |
US6847828B2 (en) | 2000-07-03 | 2005-01-25 | Matsushita Electric Industrial Co., Ltd. | Base station apparatus and radio communication method |
JP3699910B2 (ja) | 2000-10-31 | 2005-09-28 | 株式会社東芝 | データ伝送装置、データ伝送方法及びプログラム |
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Also Published As
Publication number | Publication date |
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KR20010023712A (ko) | 2001-03-26 |
JP2000031944A (ja) | 2000-01-28 |
CN1273732A (zh) | 2000-11-15 |
AU4397299A (en) | 2000-01-24 |
CA2301226A1 (en) | 2000-01-13 |
EP1011245A1 (en) | 2000-06-21 |
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