JP3816470B2 - Code modulation adaptive variable multiplex transmission method and code modulation adaptive variable multiplex transmission apparatus using the method - Google Patents

Description

  The present invention relates to a code modulation multiplex transmission technique, and in particular, code modulation capable of efficiently transmitting high-speed information or data corresponding to different transmission conditions such as transmission path conditions, various media, or various services. The present invention relates to an adaptive variable multiplex transmission method and apparatus.

  Transmission information data in slot units or packet units consisting of a plurality of slots is selected from a plurality of coding schemes and coding rates prepared in advance and encoded for error correction, and selected from a plurality of multilevel modulation schemes prepared in advance. For example, Japanese Laid-Open Patent Publication No. 2000-183849 and Japanese Laid-Open Patent Publication No. 10-224322 disclose conventional code modulation adaptive variable transmission apparatuses that perform primary modulation and convert the transmission signal into a wideband transmission band by secondary modulation. And JP-A-11-234241.

  Further, regarding related techniques, refer to Japanese Patent Application Laid-Open No. 10-145282, WO99 / 14878 (Japanese Patent Application Laid-Open No. 2001-517017), and Japanese Patent Application Laid-Open No. 9-135275.

  In recent multimedia communication, the demand for Internet traffic has increased dramatically, and the demand for further high-speed data packet transmission technology has increased. In order to realize high-speed data transmission, techniques such as adaptive modulation using multi-level modulation have been introduced, and the encoding method and encoding rate of an encoder such as the above-described conventional transmission apparatus and the first order are used. A code modulation adaptable transmission apparatus using a method of selectively switching the modulation method of a modulator has been devised.

JP 2000-183849 A

JP-A-10-224322 JP-A-11-234241 WO99 / 14878 (Japanese Patent Laid-Open No. 2001-517017) JP-A-9-135275

  The code modulation adaptive variable transmission apparatus examined by the present inventors in the present invention will be described below.

  FIG. 3 shows the configuration of the transmission unit of the conventional code modulation adaptive variable transmission apparatus, and FIG. 4 shows the configuration of the reception unit.

  First, the configuration of the transmission unit will be described with reference to FIG. In FIG. 3, when transmission information data 301 in units of slots or packets is input, the transmission condition identification circuit 306 specifies the data rate, the data capacity of the transmission information data 301, or the transmission condition designation information included in the information data. The transmission condition information 307 such as the data rate and the data capacity is identified and output to the transmission unit control circuit 308. The transmission unit control circuit 308 switches the error correction coding scheme and coding rate of the encoder 303 and the multi-level modulation scheme of the primary modulator 304 based on the transmission unit control signal 309 according to the transmission condition information 307. And the transmission condition identification information adding circuit 310 are controlled. Although not shown, there is also a transmission apparatus that provides a means for monitoring the propagation status and traffic status of the transmission path, and designates transmission conditions according to the transmission path status to the transmission unit control circuit 308.

  Through the control described above, the input transmission information data 301 is encoded in the transmission channel 302 with the error correction encoding method and encoding rate selected and set in the encoder 303, and further in the primary modulator 304. Transmission condition identification information 311 is added by transmission condition identification information adding circuit 310 as data that has been subjected to primary modulation using the selected multi-level modulation method and converted into a command or the like. The transmission signal 312 is output after widening the band by spreading modulation using a multiplex or spreading code. The signal 312 transmitted from the transmission channel 302 in this way is received by the receiving unit.

  In the reception unit of FIG. 4, in the reception channel 402, the reception signal 401 is input to the secondary demodulator 403, and is subjected to secondary demodulation such as OFDM or spread demodulation, and returned to a multi-level modulated signal. Next, the transmission condition identification circuit 406 identifies the added transmission condition identification information 407 and outputs the identified transmission condition information 408 to the reception unit control circuit 409. The multilevel demodulation of the primary demodulator 404 is selectively switched by the reception unit control signal 410 from the reception unit control circuit 409, and the multilevel modulation signal output from the secondary demodulator 403 is converted into encoded data, Further, the decoding method and coding rate for error correction of the decoder 405 are selectively switched, and the encoded data is converted from the decoder 405 to received information data 411 and output.

  In this transmission apparatus, the modulation method of the secondary modulator 305 is fixed without being selectively switched as in the case of primary modulation.

  However, in this code modulation adaptive variable transmission apparatus, in order to transmit higher-speed data, the processing operation of the encoder, the primary modulator, and the secondary modulator in the transmission channel, the decoder in the reception channel, and the primary It is necessary to speed up the processing operation of the demodulator and the secondary demodulator, and the processing circuit elements, especially the AD (Analog to Digital) converter of the transmitting unit and the DA (Digital to Digital) of the receiving unit, which are difficult to increase in speed. Analog) converters need to be developed at high speed.

  Further, in higher-speed data transmission, various switching conditions of information data, propagation conditions of the transmission line are selected in the selection switching between the coding method and coding rate of the encoder and the multi-level modulation method of the primary modulator. In addition, there is a problem that fine adaptive control cannot be performed in response to fluctuations in traffic conditions and the frequency utilization efficiency is reduced.

  The object of the present invention is to support higher-speed data transmission without speeding up the encoding and primary modulation and secondary modulation of the transmitter, or the decoding and primary and secondary demodulation of the receiver. The code modulation adaptive variable multiplex transmission method and apparatus are provided.

  Another object of the present invention is to provide a code modulation adaptive variable capable of efficiently transmitting higher-speed information data corresponding to different transmission conditions such as transmission path conditions, various media or various services. It is to provide a multiplex transmission method and apparatus.

A code modulation adaptive variable multiplex transmission apparatus according to an aspect of the present invention is provided.
A data division circuit that divides data to be transmitted into transmission signals of a plurality of transmission subchannels;
A primary modulator that is provided for each of the plurality of transmission subchannels and performs multilevel modulation on the transmission signal of the transmission subchannel from the division circuit, and is transmitted to a multilevel modulation signal obtained from the primary modulator A secondary modulator for widening the bandwidth;
Transmission condition information including a multi-level modulation scheme of a primary modulator, a wideband scheme of a secondary modulator, and the number of the plurality of transmission subchannels for each of the plurality of transmission subchannels is added to a related transmission signal. An additional circuit to
It comprises a frequency multiplexing circuit that frequency-multiplexes the wideband modulated output obtained from each secondary modulator of the plurality of transmission subchannels and outputs it as a channel for the same user.

  According to a preferred aspect of the present invention, the primary modulator provided for each of the plurality of transmission subchannels is configured to select any one of a plurality of multilevel modulation schemes, The secondary modulator provided for each of a plurality of transmission subchannels is configured to select an arbitrary one from a plurality of wideband systems.

  According to still another preferred feature of the present invention, a code for performing error correction coding on the transmission signal of the associated transmission subchannel in a stage preceding the primary modulator provided for each of the plurality of transmission subchannels The primary modulator performs multi-level modulation on the output data from the encoder.

  According to still another preferred feature of the present invention, the encoder is configured to select any one from a plurality of error correction encoding schemes and a plurality of encoding rates.

Also, a code modulation adaptive variable multiplex transmission apparatus according to another aspect of the present invention is provided.
A frequency separation circuit that frequency-divides the received frequency-multiplexed signal into modulated signals for each of a plurality of reception subchannels;
Transmission condition identification circuit for identifying transmission condition information including a multi-level modulation scheme for primary modulation, a broadband modulation scheme for secondary modulation, and the number of reception subchannels in a signal for each reception subchannel added on the transmission side When,
A control circuit for generating a control signal based on the transmission condition information identified in the transmission condition identification circuit;
Provided for each of a plurality of reception subchannels, and in response to the control circuit, the modulation signal of the associated reception subchannel obtained from the frequency separation circuit is changed to a wideband system identified by the transmission condition identification circuit. In response to the secondary demodulator demodulating by the corresponding inverse wideband system and the control circuit, the modulation signal for each reception channel demodulated by the secondary demodulator is identified by the transmission condition identifying circuit. A primary demodulator that demodulates using a multi-level demodulation method corresponding to the modulation method;
And a data synthesis circuit for synthesizing data obtained from the plurality of reception subchannels.

In addition, a code modulation adaptive variable multiplex transmission method according to another aspect of the present invention provides:
Dividing data to be transmitted into transmission signals of a plurality of transmission subchannels;
Performing multi-level modulation for each of the transmission signals of the plurality of transmission subchannels;
Widening each multi-level modulation signal of the plurality of transmission subchannels;
Adding transmission condition information including the modulation scheme of the multi-level modulation, the transmission bandwidth widening scheme, and the number of transmission subchannels to the associated transmission signal;
And frequency-multiplexing the wideband modulated outputs of the plurality of transmission subchannels to output the same user channel.

  In the code modulation adaptive variable multiplex transmission apparatus according to the present invention described above, the transmission section divides transmission information data into a plurality of subchannels, and selectively switches the error correction coding scheme and coding rate for each transmission subchannel. Coding, primary switching of the multi-level modulation scheme switched selectively, and secondary modulation of the broadband switching scheme switched selectively, the processing operation of each transmission subchannel is divided into a plurality of subchannels The speed is reduced and it becomes possible to cope with higher-speed data transmission. Similarly, in the reception unit, the processing operations of secondary demodulation, primary demodulation, and error correction decoding for each reception subchannel after separating the reception signal are slowed down, and can cope with higher-speed data transmission. . That is, the low-speed elements can also be used in the AD converter and DA converter used for encoding and primary modulation and secondary modulation of the transmission unit, or decoding and primary demodulation and secondary demodulation of the reception unit.

  In addition, the switching of the coding method and coding rate of the encoder, and the switching of the selection of the multilevel modulation system of the primary modulator, the switching of the number of subchannels, and the switching of the broadband method of the secondary modulator. By performing the combination, fine adaptive control can be performed in response to various transmission conditions, transmission path propagation conditions and traffic conditions, and frequency utilization efficiency can be further improved.

  Therefore, it is possible to efficiently transmit higher-speed information data in accordance with different transmission conditions such as transmission path conditions, various media, and various services.

  As described above, according to the present invention, the encoding and primary modulation and secondary modulation of the transmission unit, or the decoding and primary demodulation and secondary demodulation processing operations of the reception unit are slowed down and it is difficult to increase the speed. A low-speed element can be used for both the AD converter and the DA converter, and a transmission apparatus that can handle higher-speed data transmission can be realized.

  In addition, according to the present invention, finer adaptive control can be performed in response to various transmission conditions, transmission path propagation status and traffic status fluctuations, and different transmission conditions such as various media or various services can be used. Correspondingly, it is possible to realize a transmission apparatus that can efficiently transmit higher-speed information data.

  According to an embodiment of the code modulation adaptive variable multiplex transmission apparatus of the present invention, which divides information data into signals of a plurality of subchannels, frequency-multiplexes the plurality of subchannels and transmits them as a channel of the same user, according to the present invention. This will be described with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of a transmission section of an embodiment of a code modulation adaptive variable multiplex transmission apparatus according to the present invention. The transmission unit identifies transmission condition information 108 by identifying transmission condition information 108 based on the input data rate, data capacity of transmission information data 101 in units of slots or packets, or transmission condition designation information included in the information data. A transmission unit control circuit 109 to which transmission condition information 108 identified by the transmission condition identification circuit 107 is supplied, and a transmission unit control signal 110 from the transmission unit control circuit 109. Prepared in advance in each transmission subchannel (1) to (n) 103 by the data division circuit 102 that divides the channel (1) to (n) 103 and the transmission unit control signal 110 from the transmission unit control circuit 109 (code Multiple encoding methods (container circuit, convolutional encoding, Reed-Solomon, BCH, etc.) ) And a coding unit 104 that selectively switches the coding rate and performs error correction coding with a desired coding method and coding rate, and transmission unit control according to transmission condition information 108 from the transmission unit control circuit 109 A plurality of multilevel modulation schemes (modulation schemes such as QPSK including BPSK and 16QAM) prepared in advance in each transmission subchannel (1) to (n) 103 (provided as a circuit of the modulator) by the signal 110 A primary modulator 105 that performs selective switching and performs primary modulation according to a desired multi-level modulation scheme, and transmission condition identification information 112 corresponding to transmission condition information 108 set by the transmission unit control circuit 109 are transmitted to each transmission subchannel ( 1) to (n) 103, transmission condition identification information adding circuit 111 added to the transmission signal, and transmission unit control signal 110 from transmission unit control circuit 109. (1) to (n) 103, which is prepared in advance (provided as a circuit of the modulator) and selectively switches between wideband systems such as OFDM (Orthogonal Frequency Division Multiplex) and spread modulation (spread spectrum). A secondary modulator 106 that performs secondary modulation according to a method and a frequency multiplexing circuit 114 that frequency-multiplexes transmission modulation signals 113 obtained from a plurality of transmission subchannels (1) to (n) 103 are configured.

  FIG. 6 shows a configuration example of the encoder 104. The encoder 104 uses a plurality of encoding schemes (encoding schemes such as convolutional encoding, Reed-Solomon, and BCH) prepared in advance by a transmission control signal 110 from the transmission control circuit 109 and a desired code. The coding method and the coding rate are selected.

  FIG. 7 shows a configuration example of the primary modulator 105. The primary modulator 105 is configured to select a desired multilevel modulation scheme from a plurality of multilevel modulation schemes (BPSK, QPSK, 16QAM, etc.) prepared in advance by a transmission control signal 110 from the transmission control circuit 109. Yes.

  FIG. 8 shows a configuration example of the secondary modulator 106. The secondary modulator 106 is configured to select a desired wideband system from a plurality of wideband systems (OFDM, spread modulation (spread spectrum), etc.) prepared in advance by the transmission control signal 110 from the transmission control circuit 109. ing.

  The data division circuit 102 uses the transmission unit control signal 110 based on the transmission condition information 108 from the transmission unit control circuit 109 to distribute the transmission information data 101 to the plurality of transmission subchannels (1) to (n) 103 at equal or different rates. It is a circuit to divide. For example, in the case of four subchannels, the data division circuit 102 divides one transmission channel into each subchannel every time four pieces of transmission information data are input, and a different ratio (for example, 1 : 2: 3: 4 ratio), every time 10 pieces of transmission information data are input, 1 sub-channel, two sub-channels, four sub-channels, and four sub-channels are input. Will be divided. Also, the reason why the sub-channel is referred to is that a plurality of channels are frequency-multiplexed and used by one user as one channel.

  Here, the encoder 104, the primary modulator 105, and the secondary modulator 106 are required for each of the transmission subchannels (1) to (n) 103. The transmission condition identification information adding circuit 111 adds the transmission condition identification information 112 to each of the transmission subchannels (1) to (n) 103 or to one or a plurality of transmission subchannels designated in a lump ( The transmission condition identification information 112 is added as data such as a command omitted as much as possible). The transmission condition identification information 112 is added by fixing the wideband method of the secondary modulator 106 to a method determined and specified in advance on the transmission side reception side.

  When transmission information data 101 in units of slots or packets is input to the transmission unit configured as described above, the transmission condition identification circuit 107 transmits the data rate, data capacity, or transmission conditions included in the information data of the transmission information data 101. Coding information of each subchannel, such as convolutional coding [convolutional code], Reed-Solomon [Reed-Solomon code], BCH [Bose-Chaudhuri-Hocquenghem code] ) And the coding rate, the primary modulation multi-level modulation scheme, the secondary modulation broadband scheme, and the number of subchannels to be divided and multiplexed are identified, and the identified transmissions are identified. The condition information 108 is output to the transmission unit control circuit 109. Note that convolutional coding (a kind of error correction code. A code is generated based on a plurality of information blocks. This code has been developed in connection with a decoding method. There is a maximum likelihood decoding method). Reed-Solomon (a kind of error correction code. One of the block code systems for burst error detection / correction. It is used for communication and data recording. The block code system is the size of information bits to be transmitted. This is a method of adding a parity bit (error detection bit) to each block, and there are fire codes for burst error detection / correction, and for random error correction. , BCH code, Hamming code, cyclic code, Golay code, etc. In addition to the block code method, there is a convolutional code, which converts information bits into blocks. A method of performing exclusive OR operation processing for each of several input bits without dividing.). Here, the transmission condition identification circuit 107 may receive the transmission condition information 210 from the transmission condition identification circuit 208 of the receiving unit, which will be described later, and output the transmission condition information 108 to the transmission unit control circuit 109. Although not shown, a means for monitoring the propagation status and traffic status of the transmission path may be provided, and transmission condition information 108 corresponding to the status of the transmission path may be output to the transmission unit control circuit 109.

  The transmission unit control circuit 109 controls the data division circuit 102 to divide the transmission information data 101 equally or at different ratios into the transmission subchannels (1) to (n) 103 according to the transmission condition information 108. For each transmission subchannel (1) to (n) 103, the coding scheme and coding rate of the encoder 104, the multilevel modulation scheme of the primary modulator 105, and the broadband scheme of the secondary modulator 106, The transmission condition identification information adding circuit 111 is controlled to add the transmission condition identification information 112 to be transmitted to the transmission signal. Through the above-described control, transmission information of each transmission subchannel 103 is input to the encoder 104 and is encoded with the encoding scheme and encoding rate that are selectively switched, and the multi-value that is selectively switched in the primary modulator 105 Transmission condition identification information 112 that is first-order modulated by a modulation method and converted into a command or the like is added by a transmission condition identification information adding circuit 111. Next, secondary modulation is performed by the wideband method selected and switched in the secondary modulator 106, and a transmission modulation signal 113 is output.

  Then, the transmission modulation signals 113 from the plurality of transmission subchannels 103 are frequency-multiplexed by the frequency multiplexing circuit 114 and transmitted as the transmission multiplexed signal 115 and received by the receiving unit.

  Next, frequency multiplexing in frequency multiplexing circuit 114 will be described using frequency multiplexing examples of subchannel modulation signals in FIGS. 9 and 10. Frequency multiplexing is a process of multiplying the modulated signal of each subchannel by a carrier signal and arranging it in the frequency direction so that the channel band of each subchannel modulated signal is not increased.

  FIG. 9 shows a case where the channel bandwidths of the subchannel modulation signals are equally spaced, and each subchannel modulation signal is multiplied by a carrier signal of equal spacing and arranged in the frequency direction so as to be multiplexed. Convert to a single signal.

  As shown in FIG. 10, in the subchannel modulation signal with different number of subcarriers in the OFDM modulation system, the channel bandwidth is different. Therefore, carrier signals having different frequency intervals are multiplied with each subchannel modulation signal to obtain the channel bandwidth. The signals are multiplexed in the frequency direction so that they do not overlap, and converted into one signal.

  In all the transmission subchannels (1) to (n) 103 to be multiplexed shown in the above embodiment, the encoder 104 uses the same coding scheme and coding rate, and the primary modulator 105. May be the same multi-level modulation method, and the secondary modulator 106 may be the same wideband method. In this case, of course, the same coding scheme and coding rate may be selected and used as the encoder 104 based on the transmission unit control signal 110 obtained from the transmission unit control circuit 109. As the modulator 105, the same multi-level modulation method may be selected and used, and as the secondary modulator 106, the same wideband method may be used.

  Further, a large number of transmission subchannels (1) to (n) 103 to be multiplexed shown in the above embodiment are divided into a plurality of groups corresponding to, for example, a plurality of users, and a plurality of divided sub-channels are divided into a plurality of groups. In the subchannel, the same coding scheme and coding rate may be used as the encoder 104, the same multilevel modulation scheme may be used as the primary modulator 105, and the same wideband scheme may be used as the secondary modulator 106. . Also in this case (even in a plurality of subchannels for each divided group), the encoder 104 naturally has the same encoding scheme and code based on the transmission unit control signal 110 obtained from the transmission unit control circuit 109. The primary modulation unit 105 may select and use the same multi-level modulation method, and the secondary modulator 106 may use the same wideband method. Also good.

  FIG. 2 is a block diagram showing the configuration of the receiving unit of one embodiment of the code modulation adaptive variable multiplex transmission apparatus according to the present invention. The receiving unit includes a frequency separation circuit 202 that performs frequency separation from the received reception multiplexed signal 201 into reception modulation signals 203 of the reception subchannels (1) to (n) 204, and each reception subchannel (1) added on the transmission side. ) To (n) 204 transmission condition identification for identifying the transmission condition information 210 of the coding scheme and coding rate of the error correction, the primary modulation multi-level modulation scheme, the secondary modulation broadband scheme, and the number of subchannels. A reception unit control circuit 211 that controls the secondary demodulator 205, the primary demodulator 206, and the decoder 207 for each reception subchannel and the data synthesis circuit 213 according to the circuit 208 and the identified transmission condition information 210; And a data synthesis circuit 213 that synthesizes information data from the plurality of reception subchannels (1) to (n) 204. Here, the secondary demodulator 205, the primary demodulator 206, and the decoder 207 are required for each of the reception subchannels (1) to (n) 204.

  When the reception multiplexed signal 201 is input to the reception unit configured as described above, the frequency separation circuit 202 separates the reception multiplexed signal 201 into the reception modulation signals 203 of the plurality of reception subchannels (1) to (n) 204, and receives each reception subsignal. In the secondary demodulator 205 of the channels (1) to (n) 204, the secondary demodulation is performed by the inverse wideband system that is selectively switched by the reception unit control circuit 211, and returned to the primary modulation signal. The number n of received subchannels is the number of subchannels included in the identified transmission condition information 210.

  The primary modulation signal is supplied to the transmission condition identification circuit 208, the transmission condition identification information 209 added in the transmission unit is identified, and the transmission condition information 210 is input to the reception unit control circuit 211. In the reception unit control circuit 211, according to the transmission condition information 210, the wideband modulation scheme of the secondary modulator 106, the multilevel modulation scheme of the primary modulator 105, and the encoding scheme of the encoder 104 in each transmission subchannel 103 of the transmission section. In addition, in order to match the coding rate, the inverse wideband scheme of the secondary demodulator 205, the multilevel demodulation scheme of the primary demodulator 206, and the decoding of the decoder 207 in each of the reception subchannels (1) to (n) 204 Control to selectively switch between a system and a coding rate is performed.

  As described in the description of the transmission unit, the transmission condition identification information 209 is added by fixing the wideband method of the secondary modulator 106 to a method determined and specified in advance on the transmission side reception side. The inverse wideband system of the device 205 is switched to a system determined and specified in advance for the transmission condition identification information 209 and to a system based on the transmission condition information 210 for information data. In the transmission unit, transmission condition identification information is added to each transmission subchannel or to one or a plurality of transmission subchannels specified in a lump. Therefore, in the reception unit, reception subchannels corresponding to them are added. The transmission condition identification information 209 is identified by the transmission condition identification circuit 208.

  The primary modulation signal output from the secondary demodulator 205 is primarily demodulated by the multi-level demodulation method selected and switched by the reception unit control signal 212 from the reception unit control circuit 211 in the primary demodulator 206, and further decoded. The reception information of the reception subchannels (1) to (n) 204 is reproduced by decoding with the decoding method and coding rate selected and switched in the unit 207. The reception information of the plurality of reception subchannels (1) to (n) 204 is combined by the data combining circuit 213, and reception information data 214 is output.

  Incidentally, there are the following methods for transmitting the transmission condition identification information 112 from the transmission unit to the reception unit. In the first method, when information data is transmitted in a slot or a packet of a plurality of slots, the transmission condition identification information 112 is added to the beginning of the slot or the packet (header) and transmitted. In the second method, transmission condition identification information 112 is added to a pilot channel that is code-multiplexed or frequency-multiplexed for transmission, and transmission condition information is identified from the received pilot channel. It is a method to do. As yet another method, there is a method of transmitting the transmission condition identification information 112 in the previous slot or packet.

  FIG. 5 is a diagram illustrating an example of a packet transmission timing operation between the A station and the B station each having the transmitting unit (FIG. 1) and the receiving unit (FIG. 2). Here, each station is assumed to transmit data in packet units such as a slot composed of a plurality of transmission data or a frame composed of a plurality of the above slots. The transmission condition information is added to the part and transmitted. In FIG. 5, the horizontal axis is the time axis, (a) is the transmission data of station A, (b) is the reception data of station B, (c) is the transmission data of station B, and (d) is the reception of station A. Data are shown. Here, in the initial state, it is assumed that the number of multiplexed channels, the primary modulation, and the secondary modulation used for transmission of the information from station A are set to initial setting values that are determined in advance according to the type of the data. .

  As shown in FIG. 5A, station A transmits a transmission packet A1 having transmission condition information and data a1, which is received at station B as shown in FIG. 5B. In the transmission condition identification circuit 208 in the reception unit of station B, the transmission condition information included in the transmission packet A1 is extracted and supplied to the transmission unit control circuit 109. Thereby, as shown in (c), the B station transmits the transmission packet B1 of its own station using the set number of channels set by the transmission condition information, with the set primary modulation and secondary modulation. Further, a signal-to-interference noise power ratio calculation circuit (not shown) in the reception unit of the B station calculates a signal-to-interference noise power ratio from the received signal of the received transmission packet A1, and based on the calculation result and the like A return transmission channel transmission condition determination circuit (not shown) generates return transmission channel transmission condition information, stores it in a reception channel transmission condition information memory (not shown), and adds transmission condition identification information of the transmitter. Supply to the circuit 111. As a result, as shown in (c), the return transmission channel transmission condition information is added to the transmission packet B1 transmitted by the station B and transmitted.

  As shown in FIG. 5 (d), this transmission packet B1 is received by the A station, and is extracted by the transmission condition identifying circuit 208 in the same manner as the receiving section of the B station at the receiving section of the A station. Based on the transmission condition information, the channel multiplexing number, primary modulation, and secondary modulation of the next transmission packet A2 are set. Also, transmission condition information specified for the station B is generated by the loop transmission channel transmission condition determination circuit, and is added to the transmission packet A2 and transmitted. The station B that has received the transmission packet A2 takes out the transmission condition information stored in the transmission packet and sets it in the control circuit 109 of the transmission unit in the same manner as described above, and also returns the transmission channel to the station A. Generate transmission condition information. At this time, the secondary demodulator 205, the primary demodulator 205, the primary demodulator 205, the primary demodulator 205, the primary demodulator 205, the primary demodulator 205, The demodulator 206 and the data synthesis circuit 213 are set.

  In the code modulation adaptive variable multiplex transmission apparatus according to the present invention described above, the transmission unit divides transmission information data into a plurality of subchannels, encodes error correction for each transmission subchannel, and performs a primary of a multilevel modulation scheme. Since the modulation and the secondary modulation of the wideband system are performed, the processing operation of each transmission subchannel is slowed by dividing it into a plurality of subchannels. Similarly, in the receiving unit, the processing operations of the secondary demodulation, the primary demodulation, and the decoding for each reception subchannel after separating the reception signal are slowed down. Further, the AD converter and the DA converter in the encoder and the primary modulator and the secondary modulator or the secondary demodulator, the primary demodulator, and the decoder can be handled by low-speed elements.

  In addition to selecting and switching the coding system and coding rate of the encoder and the multilevel modulation system of the primary modulator, switching of the number of subchannels and switching of the broadband system of the secondary modulator are performed in combination. Thus, fine adaptive control is possible in response to various transmission conditions, transmission path propagation conditions, and traffic conditions, and the frequency utilization efficiency can be further improved.

  Therefore, it is possible to efficiently transmit higher-speed information data in accordance with different transmission conditions such as transmission path conditions, various media, and various services.

It is a block diagram which shows the structure of the transmission part of one Example of the code modulation adaptive variable multiplex transmission apparatus which concerns on this invention. It is a block diagram which shows the structure of the receiving part of one Example of the code modulation adaptive variable multiplex transmission apparatus which concerns on this invention. It is a block diagram which shows the structure of the transmission part of the code modulation adaptive variable transmission apparatus which this inventor examined in the process of this invention. It is a block diagram which shows the structure of the receiving part of the code modulation adaptive variable transmission apparatus which the inventor examined in the process of this invention. It is a figure which shows an example of the packet transmission / reception timing operation | movement in one Example of the code modulation adaptive variable multiplex transmission apparatus of this invention. FIG. 2 is a block diagram illustrating a configuration of an example of an encoder of a transmission unit of the code modulation adaptive variable multiplex transmission apparatus of FIG. 1. FIG. 2 is a block diagram illustrating a configuration of an example of a primary modulator of a transmission unit of the code modulation adaptive variable multiplex transmission apparatus of FIG. 1. FIG. 2 is a block diagram illustrating a configuration of an example of a secondary modulator of a transmission unit of the code modulation adaptive variable multiplex transmission apparatus of FIG. 1. FIG. 2 is a diagram for explaining an example of subchannel frequency multiplexing in a frequency multiplexing circuit of a transmission unit of the code modulation adaptive variable multiplexing transmission apparatus of FIG. 1. FIG. 6 is a diagram for explaining another example of subchannel frequency multiplexing in the frequency multiplexing circuit of the transmission unit of the code modulation adaptive variable multiplexing transmission apparatus of FIG. 1.

Explanation of symbols

101: Transmission information data, 102: Data division circuit, 103: Transmission subchannel, 104: Encoder, 105: Primary modulator, 106: Secondary modulator, 107: Transmission condition identification circuit of transmission unit, 108: Transmission condition information of transmission section 109: Transmission section control circuit 110: Transmission section control signal 111: Transmission condition identification information addition circuit 112: Transmission condition identification information of transmission section 113: Transmission modulation signal 114: Frequency multiplexing 115: Transmission multiplexed signal, 201: Reception multiplexed signal, 202: Frequency separation circuit, 203: Reception modulation signal, 204: Reception subchannel, 205: Secondary demodulator, 206: Primary demodulator, 207: Decoding 208: Transmission condition identification circuit of reception unit, 209: Transmission condition identification information of reception unit, 210: Transmission condition information of reception unit, 211: Control unit of reception unit Path, 212: reception unit control signal, 213: data synthesis circuit, 214: reception information data.

Claims (6)

A multiplex transmission apparatus that divides transmission information data into transmission signals of a plurality of transmission subchannels and performs transmission,
A transmission condition identification circuit for identifying transmission condition information;
A transmitter control circuit that performs control based on the transmission condition information identified by the transmission condition identification circuit;
A data dividing circuit for dividing the transmission information data into a transmission signal for each of said plurality of transmission sub-channel under the control of the transmission unit control circuit,
It provided for each of the plurality of transmission subchannel, a plurality of coding for encoding error correction by each coding scheme and a coding rate in parallel for the transmission signal of the divided by the division circuit a plurality of transmission sub-channel vessel, a plurality of primary modulators performs multilevel modulation in parallel for transmission signals of each transmission sub-channel obtained from each of the plurality of encoders, and each transmission obtained from each of said plurality of primary modulators a plurality of secondary modulator for performing broadband transmission band in parallel for the multilevel modulation signal of sub-channels,
For each of the plurality of transmission subchannels , the coding scheme and coding rate of each encoder, the multilevel modulation scheme of each primary modulator, the wideband scheme of each secondary modulator, and the plurality of transmissions An additional circuit for adding transmission condition information including the number of subchannels to the related transmission signal;
Characterized in that it has a transmission unit and a frequency multiplexing circuit for outputting as the channel of the same user by frequency-multiplexing the modulated output which is widened obtained from each secondary modulator of said plurality of transmission sub-channel Code modulation adaptive variable multiplex transmission apparatus. The code modulation adaptive variable multiplex transmission apparatus according to claim 1 , wherein each of the encoders provided for each of the plurality of transmission subchannels includes a plurality of types of encoding schemes (convolutional encoding, (Including Reed-Solomon and BCH) and a plurality of types of coding rates, and any one coding scheme and any one coding rate are selected, and each of the plurality of transmission subchannels is provided with the coding rate Each primary modulator is configured to select any one of a plurality of types of multilevel modulation schemes (including QPSK and 16QAM including BPSK) under the control of the transmitter control circuit, and select the respective secondary modulator provided for each channel one of any of a plurality of types of broad-band scheme (including OFDM and spreading modulation) by the control of the transmission unit control circuit Code modulation adaptive variable multiplex transmission apparatus characterized by being configured to. A multiplex transmission apparatus that divides transmission information data into transmission signals of a plurality of transmission subchannels and performs transmission,
A transmission condition identification circuit for identifying transmission condition information;
A transmitter control circuit that performs control based on the transmission condition information identified by the transmission condition identification circuit;
A data dividing circuit for dividing the transmission information data into a transmission signal for each of said plurality of transmission sub-channel under the control of the transmission unit control circuit,
Wherein the plurality of provided for each transmission sub-channel coding scheme of a plurality of types in response to the control of the transmission unit control circuit (convolutional coding, Reed including Solomon and BCH) and any of a plurality of types of coding rates A plurality of encoders for performing error correction coding in parallel for each of transmission signals of a plurality of transmission subchannels divided by the dividing circuit by selecting one coding method and any one coding rate; In response to the control of the transmission unit control circuit , one multilevel modulation scheme is selected from a plurality of types of multilevel modulation schemes (including QPSK and 16QAM including BPSK) and obtained from each of the plurality of encoders. a plurality of primary modulators for modulating the transmission signals in parallel for each transmission subchannels, and the or a plurality of types of broad-band scheme in response to the control of the transmission unit control circuit (including OFDM and spreading modulation) A plurality of secondary modulators for broadband in parallel M-ary modulation signal of each transmission sub-channel obtained from each of the plurality of primary modulators select one wideband scheme,
For each of the plurality of transmission subchannels , the coding scheme and coding rate of each encoder, the multilevel modulation scheme of each primary modulator, the wideband scheme of each secondary modulator, and the plurality of transmissions An additional circuit for adding transmission condition information including the number of subchannels to the associated transmission signal;
Characterized in that it has a transmission unit and a frequency multiplexing circuit for outputting as the channel of the same user by frequency multiplexing the modulated output which is widened obtained from each secondary modulator of said plurality of transmission sub-channel Code modulation adaptive variable multiplex transmission apparatus. The code modulation adaptive variable multiplex transmission apparatus according to claim 1,
A frequency separation circuit for frequency dividing the modulation signal for each of the plurality of received sub-channel from the frequency-multiplexed signal received,
It is added on the transmission side receiving the respective encoders in the sub-channel for each of the signal encoding method and the encoding rate and the primary modulator multilevel modulation and wideband scheme and the plurality of the second-order modulator A transmission condition identification circuit for identifying transmission condition information including the number of transmission subchannels;
A receiver control circuit that performs control based on the transmission condition information identified in the transmission condition identification circuit;
Provided for each of the plurality of reception subchannels, and in parallel with each of the transmission bands of the modulation signals of the plurality of reception subchannels obtained by frequency division from the frequency separation circuit in response to the control of the reception unit control circuit a plurality of secondary demodulators for demodulating the reverse wideband mode corresponding to the wideband scheme identified by the transmission condition identification circuit, in each of the secondary demodulators of said plurality in response to the control of the receiver control circuit a plurality of primary demodulators for demodulating multi-level demodulation method corresponding to the multi-level modulation scheme identified by the transmission condition identification circuit a modulation signal of each received sub-channel which is demodulated in parallel, and the receiver control circuit In response to the control, the reception signals of the reception subchannels demodulated by each of the plurality of primary demodulators are decoded in parallel with the decoding scheme and the coding rate corresponding to the coding scheme identified by the transmission condition identification circuit. Decrypt And decoder,
Code modulation adaptive variable multiplexing transmission characterized by having a receiving section and a data combining circuit for combining the received information data obtained from the decoder of the plurality of received sub-channel under the control of the receiver control circuit apparatus. A multiplex transmission method in which transmission information data is divided into transmission signals of a plurality of transmission subchannels and transmitted,
A transmission condition identification step for identifying transmission condition information by a transmission condition identification circuit;
A control step of performing control in the transmission unit control circuit based on the transmission condition information identified in the transmission condition identification step;
A division step of dividing the transmission information data into transmission signals of the plurality of transmission subchannels by a data division circuit under the control of the transmission unit control circuit ;
In each of the plurality of transmission subchannels, the transmission signals of the transmission subchannels divided in the division step are encoded for error correction by the encoding method and coding rate using the respective encoders. each primary modulators have line M-ary modulation using a multi-level modulation signal to each of the secondary modulation for each transmit sub-channel obtained from the multi-value modulation for transmission signal of each transmission sub-channel obtained from the reduction Step of widening the transmission band using a device ;
For each of the plurality of transmission subchannels, the coding scheme and coding rate of each encoder, the multilevel modulation scheme of each primary modulator, the wideband scheme of each secondary modulator, and the plurality of transmissions An additional step of adding transmission condition information including the number of subchannels to an associated transmission signal in an additional circuit ;
Have a frequency multiplexing step of outputting as the channel of the same user and frequency multiplexed using frequency multiplexing circuit a modulated output which is broadband obtained from each secondary modulator of said plurality of transmission sub-channel, code modulation adaptive variable multiplex transmission method and transmitting. The code modulation adaptive variable multiplex transmission method according to claim 5,
Using a frequency separation circuit to frequency-divide the received frequency multiplexed signal into a modulated signal for each of a plurality of reception subchannels;
The coding method and coding rate of each encoder in the signal for each reception subchannel added on the transmission side, the multilevel modulation method of each primary modulator, the wideband method of each secondary modulator, and the plurality of a transmission condition identification step of identifying the heat transmission conditions identification circuit transmission condition information including the number of transmission sub-channel,
A control step of performing control in the receiver control circuit based on the transmission condition information identified in the transmission condition identification step;
In each of the plurality of reception subchannels, the modulation signal of each reception subchannel obtained by frequency division from the frequency separation step in response to the control of the reception unit control circuit is obtained using each secondary demodulator. Demodulated by an inverse wideband system corresponding to the wideband system identified in the transmission condition identification step, and each of the modulated signals of each received subchannel demodulated in response to the control of the receiver control circuit Receiving subchannels demodulated by a multilevel demodulation scheme corresponding to the multilevel modulation scheme identified in the transmission condition identification step using a demodulator, and subjected to the primary demodulation in response to control of the receiver control circuit Decoding the received signal with a decoding scheme and a coding rate corresponding to the coding scheme identified in the transmission condition identifying step using each decoder ;
Code, characterized in that have a data synthesizing step of synthesizing the control of the receiver control circuit using the data combining circuit receiving information data obtained from the decoder of the plurality of received sub channels, receives Modulation adaptive variable multiplex transmission method.

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