JP4588547B2 - Multiplex communication system and multiple communication method - Google Patents

Description

  The present invention relates to a multiplex communication system in which a plurality of different communication channels are multiplexed onto a single transmission means.

  Conventionally, the following is known as a multiplexing communication system for multiplexing a plurality of communication channels on a single transmission source.

  A buffer for storing communication data for each communication channel is installed in the transmission side device, and the communication data is once stored in the buffer before transmission from the transmission source.

  The scheduler refers to the total amount of communication data stored in the buffer for each channel, selects a buffer for reading communication data in a predetermined order, reads the communication data from the selected buffer, and sends it to the receiving device. Send to.

  At this time, communication data is read in units of data blocks. If the communication data format is Ethernet (registered trademark) format, it is read in units of Ethernet (registered trademark) of 64 to 1518 bytes, and if it is ATM format, it is read in units of 53 bytes of ATM cells (for example, Non-Patent Documents 1 to 5). See). At this time, error correction may be performed in units of frames (see, for example, Non-Patent Document 2).

  As the scheduling rule, round-robin scheduling (for example, refer to Non-Patent Document 5 or 6) for sequentially reading from each channel, priority scheduling for assigning priority to each channel and reading communication data of a high-priority channel (for example, (See Non-Patent Document 3 or 6).

  With the above method, communication data of a plurality of communication channels can be multiplexed on a single transmission source.

IEEE Std802.3.2000 IEEE Std802.3ah-2004 IEEE Std802.1D-2004 John B. Nagle “On Packet Switches with Infinite Storage”, IEEE Transactions On Communications, Vol. COM-35, No. 4, April 1987 Manolis Katevenis and Costas Courbetis “Weighted Round-Robin Cell Multiplexing in a General-Purpose ATM Switch Inch Vs. 9, no. 8, October 1991 Toda Kei, "Detailed Network QoS Technology", published by Ohm, May 2001

  However, this multiplex communication system has the following problems.

  The priority for each channel may differ depending on the requirement required for each communication channel or the application set for the communication channel. In this case, the generally required conditions can be exemplified by the transmission rate, guaranteed bandwidth, or delay characteristic, but the required reliability may be different for each channel.

  That is, the communication channel is required to communicate with a sufficiently small error rate even in a poor communication environment. Furthermore, even if the communication environment suddenly deteriorates, it is required to be able to communicate with a sufficiently small error rate. In order to realize this, it is necessary to perform communication as follows in the multiplex communication method described above.

  For each communication channel, an encoding process according to the request is performed to ensure a necessary error rate. As the encoding method at this time, there are a method for giving an error correction code and a method using a spreading code. However, in this method, the amount of communication data to be transmitted necessarily increases due to the encoding process, so that the time required to transmit this encoded communication data from a single transmitter increases.

  Meanwhile, since communication data from other channels cannot be transmitted, the communication data of other channels remain stored in the buffer for a long time, and the delay time of this channel increases. In particular, when performing spread coding that can significantly improve the error rate, a transmission code of L bits is required for one bit of communication data, so the waiting time of other channels is simply the previous L Doubled.

  As a result, communication data of other channels is not transmitted from the transmitting apparatus for a very long time, which greatly affects applications using these communication channels. Moreover, if an unnecessarily long code is used, the communication band utilization efficiency is lowered.

  Therefore, in the present invention, the communication band is efficiently used by avoiding an increase in the delay time of the communication channel excluding the communication channel in which communication data increases due to encoding and the bit error rate of the communication channel to be encoded. It is an object of the present invention to provide a multiplex communication system and a multiplex communication method capable of maintaining the above.

  In the present invention, in order to achieve the above object, a plurality of signals to be transmitted from the transmission apparatus are encoded in advance, and are multiplexed in units of bits by multiplying by a predetermined weight. Also, the bit error rate is measured on the receiving device side connected to the transmitting device, and the code or code length for encoding by the transmitting device and the weight for the bit string for multiplexing are set on the receiving device side. It was.

Specifically, the multiplex communication system according to the present invention includes a transmitter that transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2), and the transmitter. And a receiving device that receives the multiplexed signal transmitted from the transmitting device and is oppositely connected to the receiving device, wherein the transmitting device includes p (provided that p of the N channel signals). Is a natural number equal to or less than N.) p encoders that are provided for each signal of the channel and that encode and output the signal of the channel by a direct spreading coding method using a spreading code of a predetermined code length ; Of the N channel signals, the (Np) channel signal bit strings excluding the p channel signals and the p encoded signal bit strings output from the p encoders, respectively. With a predetermined weight And a multiplexer that generates and outputs the multiplexed signal, and a transmitter that transmits the multiplexed signal output from the multiplexer by a predetermined communication method, and the receiving apparatus includes A receiver for receiving the multiplexed signal transmitted from the transmitter and outputting it as an electrical signal; a distributor for distributing and outputting the multiplexed signal output from the receiver to N; and the distributor and p number of decoder for decoding corresponding to each of the encoding method p number of said p number provided for each multiplexed signal channel signals of the N of the multiplexed signal output, the Identify the multiplexed signal provided for each (Np) multiplexed signal excluding the p multiplexed signals from the N multiplexed signals from the distributor and multiplexed by the transmitter. A regenerator for regenerating, each of the regenerators The multiplexed signal and the first reference signal from the distributor are acquired, and the multiplexed signal is synchronized with one of the clock signal and the first reference signal reproduced from the multiplexed signal. Each of the decoders is correlated with a correlator that correlates the multiplexed signal from the distributor with the spreading code, and is correlated with the correlator. A second data regenerator that obtains a correlation signal, synchronizes the correlation signal with a clock signal regenerated from the correlation signal, and discriminates and reproduces one of the N channel signals; The q second data regenerators among the p second data regenerators (where q is a natural number equal to or less than p) are connected to the clock signal reproduced from the correlation signal together with the identification reproduction. Synchronize A clock signal is output, and the first data regenerator uses the first reference signal as the clock signal output from any one of the second data regenerators .

  By multiplexing the weight by multiplying the bit string, it is possible to transmit signals of other channels without waiting for the completion of transmission of signals of channels whose communication data has increased due to encoding. Therefore, the delay time required for transmitting the signal of another channel from the communication network to the other communication network can be shortened as compared with the case where it is output for each conventional frame. Therefore, even if communication data increases due to encoding, the communication environment can be maintained without deteriorating. In addition, since a plurality of channels are encoded by a predetermined encoding method for each channel, an allowable bit error rate can be ensured for each communication channel, and a channel that can communicate even if the communication environment deteriorates can be secured. . Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.

  In the direct spreading coding method using the spreading code, the rate of increase in the amount of communication data due to the coding is larger than other coding methods. According to the present invention, the effect of suppressing an increase in delay time can be exhibited even in a spread coding system with a large increase rate of communication data.

  When the clock signal generated in advance by the clock data regenerator is used as the first reference signal, highly stable identification reproduction of the multiplexed signal is enabled, and either the correlation signal or the clock signal is selected and the data reproduction clock is selected. By using it as a signal, reproduction errors can be prevented and the communication band can be used efficiently.

Specifically, the multiplex communication system according to the present invention includes a transmitter that transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2), and the transmitter. And a receiving device that receives the multiplexed signal transmitted from the transmitting device and is oppositely connected to the receiving device, wherein the transmitting device includes p (provided that p of the N channel signals). Is a natural number equal to or less than N.) p encoders that are provided for each signal of the channel and that encode and output the signal of the channel by a direct spreading coding method using a spreading code of a predetermined code length ; Of the N channel signals, the (Np) channel signal bit strings excluding the p channel signals and the p encoded signal bit strings output from the p encoders, respectively. With a predetermined weight And a multiplexer that generates and outputs the multiplexed signal, and a transmitter that transmits the multiplexed signal output from the multiplexer by a predetermined communication method, and the receiving apparatus includes A receiver that receives the multiplexed signal transmitted from the transmitter, automatically gain-amplifies and outputs the signal as an electrical signal, and a distributor that distributes and outputs the multiplexed signal output from the receiver to N P channels of N multiplexed signals output from the distributor are provided for each of the p multiplexed signals, and each of the p channel signals is decoded corresponding to the encoding scheme. The decoder and the N multiplexed signals from the distributor are provided for every (Np) multiplexed signals excluding the p multiplexed signals and multiplexed by the transmitter A regenerator for recognizing and reproducing the multiplexed signal; This obtains a correlator that correlates the multiplexed signal from the distributor and the spreading code, a correlation signal correlated by the correlator, and a second reference signal, and from the correlation signal A second data regenerator that identifies and reproduces one of the N channel signals by synchronizing the correlation signal with either the regenerated clock signal or the second reference signal; Further, q (where q is a natural number equal to or less than p) of the p second data regenerators, the clock data reproduced from the correlation signal together with the identification replay And a clock signal synchronized with either the second reference signal or the second reference signal, and the second data regenerator uses the second reference signal as the clock signal output from another second data regenerator. The

By multiplexing the weight by multiplying the bit string, it is possible to transmit signals of other channels without waiting for the completion of transmission of signals of channels whose communication data has increased due to encoding. Therefore, the delay time required for transmitting the signal of another channel from the communication network to the other communication network can be shortened as compared with the case where it is output for each conventional frame. Therefore, even if communication data increases due to encoding, the communication environment can be maintained without deteriorating. In addition, since a plurality of channels are encoded by a predetermined encoding method for each channel, an allowable bit error rate can be ensured for each communication channel, and a channel that can communicate even if the communication environment deteriorates can be secured. . Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.
In the direct spreading coding method using the spreading code, the rate of increase in the amount of communication data due to the coding is large compared to other coding methods. According to the present invention, the effect of suppressing an increase in delay time can be exhibited even in a spread coding system with a large increase rate of communication data.
When the clock signal generated in advance by the clock data regenerator is used as the second reference signal, the correlation signal can be identified and reproduced with high stability, and either the correlation signal or the clock signal can be selected to reproduce the clock signal. Therefore, it is possible to efficiently use the communication band while preventing reproduction errors.

  Further, in the multiplex communication system, the transmission apparatus sets a magnitude of the weight for the signals of the N channels and a code length of the spreading code or the spreading code for the signals of the p channels. It is desirable to provide further.

  By setting the weight, the spread code, or the code length of the spread code with the setting device, it becomes possible to flexibly change the transmission conditions in the transmission apparatus according to the communication environment.

  Further, in the multiplex communication system, the receiving device may be configured such that the weight for the N channel signals transmitted by the transmitting device and the spreading code or the spreading code for the p channel signals are transmitted. A notification device for determining a length based on the multiplexed signal received from the transmission device and notifying the transmission device; wherein the setting device is configured such that the setting device has a magnitude of the weight notified from the notification device. It is desirable to set the size of the weight and the code length of the spreading code or the spreading code according to the spreading code or the code length of the spreading code.

  In this way, by performing transmission control of the transmission device in the reception device, it is possible to perform communication while recognizing the transmission state of the transmission device in the reception device. Therefore, even when the communication environment deteriorates, the communication environment can be quickly recovered by changing the weight, the spread code, or the code length of the spread code.

  Further, in the multiplex communication system, the receiving device measures p errors for measuring a bit error rate of the p channel signals for each channel from the p channel signals decoded by the decoder. A rate measurer, wherein the notifier is configured such that the weight magnitude, the spreading code, or the p code error rate measured by the p error rate measurers is equal to or less than an allowable bit error rate. It is desirable to determine the code length of the spreading code.

  Thus, by providing the notifier, it is possible to dynamically set the weight, spread code or code length of the spread code for the bit error rate of the encoded signal, so that the bit error rate increases rapidly. This can be prevented and maintained without deteriorating the communication environment.

  Further, in the multiplex communication system, in the transmission apparatus, the weight of one channel signal with p = 1 among the two channel signals with N = 2 is set to W1 (W1 is a natural number) And the allowable bit error rate for one channel signal where p is 1 and the weight for the other channel signal is W2 (W2 is 1). e is an arbitrary value), the notification device in the receiving apparatus measures the bit error rate for one channel signal measured by the error rate measuring device and having the p as 1. When em is less than e, the code length of the spreading code is determined to be L1 (where L1 is a natural number), and when em is greater than or equal to e, the code length of the spreading code is set to L2 (however, L2 Is a natural number It is desirable to determine the.) To be and L1 <L2.

  When the bit error rate increases in this way, the code length is lengthened to lower the bit error rate of the signal of the channel to be encoded. On the other hand, if the bit error rate is less than or equal to the allowable bit error rate, the communication condition is satisfied. Therefore, by reducing the code length and suppressing the increase in the amount of communication data due to encoding, the signal of the channel to be encoded is effectively The communication speed can be increased and the communication band can be used efficiently.

  Further, in the multiplex communication system, the transmitting apparatus may include p buffers for storing the signals of the p channels for each channel in advance in the preceding stage of the p encoders, and in advance in the preceding stage of the multiplexer. (Np) number of buffers for storing the signals of the (Np) channels for each channel, and a buffer amount measurement for measuring the amount of the channel signals stored in the N number of buffers for each buffer. And a notification signal generator that generates a notification signal for notifying the buffer amount measured by the buffer amount measuring device and outputs the notification signal as a signal of any one of the p channel signals. The notification device in the receiving device further includes the notification signal output from the notification signal generator and the bit error rate measured based on the bit error rate measured by the error rate measuring device. It is desirable to determine the code length of the spread code or the spread code.

  Thus, by setting the weight, spreading code or code length of the spreading code based on the buffer amount stored in the transmitting device and the bit error rate in the receiving device, the communication environment can be maintained even if the buffer amount increases. It can be maintained without deteriorating.

  Further, in the multiplex communication system, the transmitting apparatus may include p buffers for storing the signals of the p channels for each channel in advance in the preceding stage of the p encoders, and in advance in the preceding stage of the multiplexer. (Np) number of buffers for storing the signals of the (Np) channels for each channel, and a buffer amount measurement for measuring the amount of the channel signals stored in the N number of buffers for each buffer. It is preferable that the setting device further sets the weight to a predetermined value corresponding to the buffer amount measured by the buffer amount measuring device.

  As a change in the communication environment, an increase or decrease in the buffer amount of each channel can be considered. Therefore, by changing the weight according to the increase / decrease of the buffer amount, for example, the effective value of the transmission rate can be maintained.

  Also, in the multiplex communication system, in the transmission apparatus, when N is 2, the setting unit in the transmission apparatus is a signal of one channel measured by the buffer amount measurement device and p is set to 1. When the buffer amount is 0, the weight for the signal of one channel with p = 1 is set to 0 and the weight for the signal of the other channel 1 is set to 1, and is measured by the buffer amount measuring device. When the buffer amount of the signal of one channel with 1 being greater than 0, the weight for the signal of one channel with p being 1 is 1 and the weight for the signal of the other channel is W ( However, W is a natural number.)

  When the setting unit dynamically changes and sets the weight according to the buffer amount in this way, when the buffer amount of the channel to be encoded is 0, the signal from the buffer of the channel not to be encoded Only communication data can be read out. Therefore, the communication band can be used efficiently.

  Further, in the multiplex communication system, the transmitting apparatus may include p buffers for storing the signals of the p channels for each channel in advance in the preceding stage of the p encoders, and in advance in the preceding stage of the multiplexer. (Np) number of buffers for storing the signals of the (Np) channels for each channel, and a buffer amount measurement for measuring the amount of the channel signals stored in the N number of buffers for each buffer. And the size of the weight for the signals of the N channels and the code length of the spreading code or the spreading code for the signals of the p channels according to the buffer amount measured by the buffer amount measuring device. A setter configured to set for each channel, and each of the (Np) regenerators in the receiving apparatus includes the weighting and weighting of the multiplexed signal in advance before the first data regenerator. It may further include a delay unit for outputting delayed by a predetermined time corresponding to the code length.

  By delaying the multiplexed signal by a predetermined time in accordance with the weight and the code length, the multiplexed signal is not encoded (Np) of the multiplexed signal at the head of the clock signal from the clock data regenerator. The first bits of the signals of the channels can be matched. Therefore, the communication speed can be maintained without unnecessary delay.

  Further, in the multiplex communication system, in the transmitting apparatus, the setting unit sets a weight to 1 for a signal of one channel having p as 1 among signals of two channels having N as 2, and the other. Is set to W (where W is a natural number) and the code length for a single-channel signal where p is 1 is L (where L is a natural number). .) Is set, the delay unit in the receiver sets the multiplexed signal to the natural time of the predetermined time d (where d is L × (1 + W) / (bit rate of the signals of the two channels)). It is desirable to delay by several times.)

  The present invention is particularly the case where one of the two channel signals is encoded and the other is not encoded. This makes it possible to synchronize the leading bit of the clock signal from the clock data regenerator with the leading bit of the uncoded channel signal included in the multiplexed signal. Therefore, the multiplexed signal is not delayed more than necessary and the transmission rate is not reduced.

  Moreover, the transmission apparatus according to the present invention is any one of the transmission apparatuses described above.

  Since the transmission apparatus according to the present invention bit-multiplexes the signals of all the channels, it can suppress an increase in the delay time of other channels excluding the channels increased by the encoding. In addition, since the weight for the bit string is set according to the buffer amount in the transmission apparatus, it is possible to suppress an extreme difference in transmission waiting time, and even when there is a channel with a buffer amount of 0, when bit multiplexing is performed Since empty bits are not created in the multiplexed signal, the communication band can be used efficiently.

The receiving apparatus according to the present invention includes a transmitting apparatus that transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2) channels, and is oppositely connected to the transmitting apparatus. A receiving apparatus for receiving the multiplexed signal transmitted from the transmitting apparatus, wherein the multiplexed signal is p (wherein the N signals of the N channels are provided) p is a natural number equal to or less than N.) The signals of the channels are encoded by a direct spreading coding method using a spreading code of a predetermined code length, and the signals of the p channels among the signals of the N channels are encoded. A signal obtained by assigning a predetermined weight to each of a bit string of signals of (Np) channels excluding (Np) and a bit string of the p encoded signals, and the receiver transmits the multiplexed signal transmitted from the transmitter Receive signal A receiver that automatically amplifies and outputs the electrical signal as an electrical signal, a distributor that distributes and outputs the multiplexed signal output from the receiver to N, and the N that are output from the distributor P decoders provided for every p multiplexed signals among the multiplexed signals, each for decoding the p channel signals corresponding to the encoding scheme, and the N signals from the distributor A regenerator provided for each of the (Np) multiplexed signals excluding the p multiplexed signals among the multiplexed signals, and for identifying and reproducing the multiplexed signals multiplexed by the transmission device; Each of the regenerators obtains the multiplexed signal and the first reference signal from the distributor and regenerates the clock signal and the first reference signal reproduced from the multiplexed signal. The multiplexed signal is synchronized and the multiplexed signal is identified and reproduced. Each of the decoders includes a correlator that correlates the multiplexed signal from the distributor and the spreading code, and obtains a correlation signal correlated by the correlator. A second data regenerator for identifying and reproducing a signal of any one of the N channel signals by synchronizing the correlation signal with a clock signal regenerated from the correlation signal; Among the second data regenerators, q (where q is a natural number equal to or less than p), the second data regenerators are clock signals synchronized with the clock signal regenerated from the correlation signal together with the identification replay. And the first data regenerator uses the first reference signal as the clock signal output from any one of the second data regenerators.
In addition, a receiving apparatus according to the present invention is connected to a transmitting apparatus that transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2), and the transmitting apparatus. A receiving apparatus for receiving the multiplexed signal transmitted from the transmitting apparatus, wherein the multiplexed signal is p (wherein the N signals of the N channels are provided) p is a natural number equal to or less than N.) The signals of the channels are encoded by a direct spreading coding method using a spreading code of a predetermined code length, and the signals of the p channels among the signals of the N channels are encoded. A signal obtained by assigning a predetermined weight to each of a bit string of signals of (Np) channels excluding (Np) and a bit string of the p encoded signals, and the receiver transmits the multiplexed signal transmitted from the transmitter Receive signal A receiver that automatically amplifies and outputs the electric signal as an electrical signal, a distributor that distributes and outputs the multiplexed signal output from the receiver to N, and the N multiplexers that are output from the distributor P decoders provided for each of the p multiplexed signals among the encoded signals, respectively, for decoding the p channel signals corresponding to the encoding scheme, and the N number of signals from the distributor A regenerator provided for each of the (Np) multiplexed signals excluding the p multiplexed signals among the multiplexed signals, and for identifying and reproducing the multiplexed signals multiplexed by the transmission device. Each of the decoders obtains a correlator for correlating the multiplexed signal from the distributor with the spreading code, a correlation signal correlated with the correlator, and a second reference signal. , A clock signal reproduced from the correlation signal and the second reference signal A second data regenerator for identifying and reproducing any one of the N channel signals by synchronizing the correlation signal with any one of the second channel and the p second data reproducing units. Q (where q is a natural number less than or equal to p) of the second data regenerators is one of the clock signal and the second reference signal regenerated from the correlation signal together with the identification replay. The second data regenerator uses the second reference signal as the clock signal output from the other second data regenerator.

  The receiving device according to the present invention detects the bit error rate at the receiving device, feeds back to the transmitting device and resets the code length, thereby enabling communication below the allowable bit error rate and degrading the communication environment. It is possible to maintain without.

In the multiplex communication method according to the present invention, the transmitting apparatus transmits a multiplexed signal obtained by multiplexing the signals of N channels (where N is an integer equal to or greater than 2), and is oppositely connected to the transmitting apparatus. The receiving apparatus is a multiplex communication method for receiving the multiplexed signal transmitted from the transmitting apparatus, wherein the transmitting apparatus is p among the signals of the N channels (where p is a natural number equal to or less than N) The signal of the number of channels is encoded by a direct spreading coding method using a spreading code of a predetermined code length, and the p channels of the bit string of the coded signal and the signals of the N channels are encoded. A predetermined weight is given to each of the bit strings of the signals of (Np) channels excluding the signals of (Np), and the multiplexed signal is generated and transmitted by a predetermined communication method. Said multiplexed transmitted Partitioned into N output as received signals electrical signals, decodes each channel p number of the multiplexed signal in the distribution of N-number of the multiplexed signal in response to the coding method, One of the clock signal and the first reference signal obtained by reproducing (Np) multiplexed signals excluding the p multiplexed signals from the multiplexed signals among the distributed N multiplexed signals. In synchronization with one, the (Np) multiplexed signals are further identified and reproduced, and when the p multiplexed signals are decoded, the multiplexed signal and the spreading code are correlated to obtain a correlation. The p-channel signals are identified and reproduced in synchronization with the clock signal regenerated from the correlation signal, and q (where q is a natural number less than or equal to p) among the p multiplexed signals. For each of the q signals of the channel. When reproducing, q clock signals synchronized with the clock signal reproduced from the correlation signal are generated together with identification reproduction, and the first reference signal is identified when identifying the (Np) multiplexed signals. Is any one of the q clock signals .

  Thus, by performing the encoding process for each channel, a different allowable bit error rate can be set for each channel. Therefore, a flexible communication environment can be selected depending on the type of communication data. In addition, even if the amount of communication data is increased by encoding a signal of a certain channel by multiplexing with assigning different weights for each channel in the transmission device, it is possible to wait without ending transmission of the increased communication data. Since the signals of the other channels can also be transmitted, an increase in the delay time of other channels can be suppressed. In addition, since a plurality of channels are encoded by a predetermined encoding method for each channel, an allowable bit error rate can be ensured for each communication channel, and a channel that can communicate even if the communication environment deteriorates can be secured. . Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.

  When the decoded signal is identified and reproduced, the clock signal generated in advance can be used as the first reference signal, so that it is possible to identify and reproduce stably, and either the multiplexed signal or the clock signal is used. By selecting and using it as a clock signal for data reproduction, it is possible to prevent a reproduction error and efficiently use the communication band.

In the multiplex communication method according to the present invention, the transmitting apparatus transmits a multiplexed signal obtained by multiplexing the signals of N channels (where N is an integer equal to or greater than 2), and is oppositely connected to the transmitting apparatus. The receiving apparatus is a multiplex communication method for receiving the multiplexed signal transmitted from the transmitting apparatus, wherein the transmitting apparatus is p among the signals of the N channels (where p is a natural number equal to or less than N) to.) pieces of the signals of the channel coded by the direct sequence coding scheme according to the spreading code of a predetermined code length, the p number of channels of the bit string and the signal of the N channels of encoded coded signal excluding the signal (N-p) to the bit string of the signal of the individual channels to generate the multiplexed signal by applying a predetermined weighting to transmitted at a predetermined communication scheme, the receiving apparatus from the transmitting device Said multiplexed transmitted Partitioned into N with automatic gain amplified outputs receiving the signal as an electric signal, each channel p number of the multiplexed signal in response to the encoding scheme of the distribution of N-number of the multiplexed signal The (Np) multiplexed signals excluding the p multiplexed signals among the distributed N multiplexed signals are respectively identified and reproduced, and the p multiplexed signals are decoded. In this case, the multiplexed signal and the spreading code are correlated, and the correlated correlation signal is synchronized with either the clock signal reproduced from the correlation signal or the second reference signal, and the p number of signals are synchronized. When identifying and reproducing channel signals, q signals are identified and reproduced for q of the p multiplexed signals (where q is a natural number equal to or less than p). The clock signal regenerated from the correlation signal Q clock signals synchronized with any one of the second reference signals are generated, and when the signals of the p channels are discriminated and reproduced, the second reference signal is used as another second reference signal. among the q number of the clock signal synchronized you with any of the clock signal.

Thus, by performing the encoding process for each channel, a different allowable bit error rate can be set for each channel. Therefore, a flexible communication environment can be selected depending on the type of communication data. In addition, even if the amount of communication data is increased by encoding a signal of a certain channel by multiplexing with assigning different weights for each channel in the transmission device, it is possible to wait without ending transmission of the increased communication data. Since the signals of the other channels can also be transmitted, an increase in the delay time of other channels can be suppressed. In addition, since a plurality of channels are encoded by a predetermined encoding method for each channel, an allowable bit error rate can be ensured for each communication channel, and a channel that can communicate even if the communication environment deteriorates can be secured. . Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.
When the correlation signal is identified and reproduced, the clock signal of another channel generated in advance can be used as the second reference signal, so that the identification signal can be stably reproduced and either the correlation signal or the clock signal can be used. By selecting and using as a clock signal for data reproduction, reproduction error can be prevented and the communication band can be used efficiently.

  In the multiplex communication method, the receiving apparatus measures a bit error rate for each channel from the decoded signals of the p channels, and the measured p bit error rates are each an allowable bit error rate. The weight of the N channel signals and the spreading code or the code length of the spreading code for the p channel signals are determined and notified to the transmission apparatus so that It is desirable that the apparatus sets the weight magnitude, the spreading code, or the code length of the spreading code according to the weight magnitude notified from the receiving apparatus, the spreading code or the code length of the spreading code.

  In this way, the bit error rate is monitored on the receiving device side, and the weight, spread code or code length of the spread code is determined so that the bit error rate of each channel is equal to or less than the allowable bit error rate. Even if communication data increases, the communication environment can be maintained without deteriorating.

  In the multiplex communication method, the transmission apparatus stores the p channel signals in a buffer for each channel before encoding the p channel signals and stores the N channel signals. Before multiplexing the signals, the signals of the (Np) channels are stored in a buffer for each channel in advance, the amount of the stored signals of the N channels is measured for each buffer, and the measured buffer amount Is generated and transmitted as a signal of any one of the p channel signals, and the reception device transmits the notification signal transmitted from the transmission device and the measured p number of signals. It is desirable to determine the size of the weight, the spreading code, or the code length of the spreading code based on the bit error rate.

  In this way, even if the buffer amount increases by setting the size of the weight, the spreading code, or the code length of the spreading code based on the buffer amount stored in the transmitting device and the bit error rate in the receiving device. The communication environment can be maintained without deteriorating.

  In the multiplex communication method described above, the transmission apparatus stores the p channel signals in a buffer for each channel in advance before encoding the p channel signals and transmits the N channel signals. Before multiplexing the signals, the signals of the (Np) channels are stored in a buffer in advance for each channel, the amount of the stored signals of the N channels is measured for each buffer, and the measured buffer amount The weight Wi for the N channel signals and the code length Lj of the spreading code for the p channel signals (where i is less than or equal to N and the N channel signals And j is equal to or less than p and corresponds to each channel of the signals of the p channels.), The receiving apparatus sets the (Np) multiplexed signals. When the multiplexed signal is delayed in advance for a predetermined time before the signal is reproduced and the multiplexed signal is delayed, the receiving apparatus performs the predetermined time di (where i = j and di is Lj × for each channel). It is desirable to delay by (1 + Wi).

  By setting the predetermined time to di, it is possible to match the leading bits of the non-coded (Np) channel signals of the multiplexed signal with the leading edge of the clock signal. Therefore, the communication speed can be maintained without unnecessary delay.

  In the multiplex communication system and the multiplex communication method according to the present invention, the communication band is efficiently used, the delay time of the communication channel excluding the communication channel in which communication data increases due to encoding, and the bit error rate of the communication channel to be encoded. It is possible to provide a multiplex communication system and a multiplex communication method capable of avoiding the increase and maintaining the communication environment.

  Hereinafter, a multiplex communication system and a multiplex communication method according to the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to the following description. In addition, in this specification and drawing, the component with the same number shall show the same thing mutually. Furthermore, when there are a plurality of identical components, they are distinguished by adding a hyphen after the same number.

  FIG. 1 shows a block diagram of a multiplex communication system 2 according to this embodiment. 2 to 5 show block configuration diagrams of a multiplex communication system according to another embodiment.

  A multiplex communication system 2 illustrated in FIG. 1 includes a transmission device 11 connected to a communication network 10 and a reception device 12 that is oppositely connected to the transmission device 11 via an optical transmission line 30.

  The transmission device 11 identifies a signal including communication data transmitted from the communication network 10 and outputs it to either the channel CH1 or the channel CH2, and a buffer for storing the signal output from the identifier 20 21-1, 21-2, an encoder 22 that encodes a signal output from the buffer 21-1 by a predetermined encoding method, and an encoded signal output from the encoder 22 and directly from the buffer 21-2. It has a multiplexer 23 that multiplexes the output signal in bit units and outputs a multiplexed signal, and a transmitter 27 that transmits the multiplexed signal output from the multiplexer 23 by a predetermined communication method. In the present embodiment, the amount of communication data stored in the buffers 21-1 and 21-2, that is, the buffer amount measuring device 26 that measures the buffer amount for each channel, and the encoding method in the encoder 22 are determined. Further, a setter 25 for setting a weight to be given to the bit string when the signal is multiplexed by the multiplexer 23 and a notification signal for notifying the buffer amount measured by the buffer amount measuring unit 26 are generated to generate the channel CH1. A notification signal generator 53 that outputs the signal as a signal.

  Here, the discriminator 20 discriminates communication data from the communication network 10 in accordance with a predetermined discriminating rule and outputs a signal including the communication data. For example, referring to the priority field in the data frame of communication data, the communication data is output to channels CH1 and CH2 in the order of high priority.

  The buffers 21-1 and 21-2 have, for example, a FIFO (First In First Out) configuration and output signals in the order received. Note that any storage format may be used as long as the communication data to be stored can be stored in units of data frames. At this time, the buffer amount measuring device 26 measures the amount of communication data stored in the buffers 21-1 and 21-2, that is, the buffer amount for each of the channels CH1 and CH2.

  The encoder 22 encodes a signal output from the buffer with a code C1 having a code length L1 by a predetermined encoding method. Examples of the predetermined encoding method include DES (Data Encryption Standard), RSA (Rivest-Shamir-Adllman), and PGP (Pretty Good Privacy). Encoding for audio / video signal compression such as JPEG (Joint Photographic Expert Group) and MPEG (Motion Picture Experts Group), encoding for error correction such as CRC (Cyclic Redundancy Check), Z for error correction (Z) coding) when encoding information such as code and CDMA (Cod Division Multiple Access) encoding during signal modulation and the like. In the present embodiment, a case will be described in which an SS (Spread Spectrum) encoding method using a spreading code applied in communication such as CDMA is applied. In the direct spreading coding method using the spreading code, the rate of increase in the amount of communication data due to the coding is large compared to other coding methods. In the present embodiment, the effect of suppressing an increase in delay time can be exhibited even in an encoding method with a large increase rate of communication data amount.

  The multiplexer 23 multiplexes the encoded signal output from the encoder 22 and the signal directly output from the buffer 21-2 by assigning weights W 1 and W 2 to the bit string of each signal, and multiplexing the multiplexed signal. Output as.

  Note that FIG. 1 shows a transmission apparatus in which one channel with the encoder 22 is provided and one channel without the encoder 22 is provided with a total of two channels, but the communication channel is shown in FIG. N may be provided as in other forms. In FIG. 2, encoders 22-1 to 22-N are provided for all N channels. However, p channels out of N channels are provided with encoders, and p channels are provided. The (Np) channels that are excluded may be channels without an encoder, and the code length in the encoders 22-1 to 22-N is set to 1 to provide a channel without an actual encoder. You can also Thus, an encoder can be flexibly provided according to a desired communication environment. When the number of channels is N as shown in FIG. 2, it is desirable to provide buffers 21-1 to 21-N for each channel. In this case, the identifier 20 outputs communication data from the channels CH1 to CHN according to a predetermined identification rule. Moreover, the buffer amount measuring device 26 measures the buffer amounts of the buffers 21-1 to 21-N for each buffer.

  FIG. 6 is a schematic diagram showing an example of the configuration of the multiplexed signal output from the multiplexer shown in FIG.

First, the signal output from the buffer 21-1 shown in FIG. 1 has a code length L 1 = L (where L is an arbitrary natural number) as shown in FIG. Is encoded and output. On the other hand, the signal output from the buffer 21-2 shown in FIG. 1 is input to the multiplexer 23 as it is. Here, as shown in FIG. 6, assuming that a 1-bit signal (the signal bit is indicated by Aj) is input to the encoder 22 shown in FIG. It is shorter than the bit rate of an input signal (bits of a signal not encoded in FIG. 6 are indicated by B _{j + r} (r = 1, 2,... N)). Therefore, the encoder 22 takes into account the multiplexing in the later multiplexer 23, and the encoded signal (in FIG. 6, the bits of the encoded signal are A ^s _j (s = 1, 2,... L). It is desirable to output the bit rate in accordance with the bit rate of the signal output from the buffer 21-2.

Next, in the multiplexer 23 shown in FIG. 1, the bit string of the encoded signal from the encoder 22 is multiplied by the weight W1 = 1, and the bit string of the signal from the buffer 21-2 is weighted W2 = W (W Is multiplied by an arbitrary natural number), and as shown in FIG. 6, the encoded signal A ^s _j and the signal B _{j + r} from the buffer are alternately arranged and multiplexed to output a multiplexed signal. When the number of channels is N as shown in FIG. 2, the multiplexer 23 multiplies the bit strings of the N channel signals by weights, for example, encodes from a buffer 22-1 having a smaller number. The encoded signals are arranged and output in the order in which the signals are output.

When multiplexing and outputting a multiplexed signal as shown in FIG. 6, the effective values VCH1 and VCH2 of the transmission rates of the channels CH1 and CH2 are:
VCH1 = (1 / L) × {1 / (1 + W)} × T
(T is the bit rate of the multiplexed signal.)
VCH2 = {W / (1 + W)} × T
It becomes.

  In this way, by multiplying the weights W1 and W2 by multiplying them by the bit string, it is possible to wait without completing the transmission of the signal of the channel CH1 that is L times as long as the encoding by the encoder 22 shown in FIG. The signal of channel CH2 can be transmitted. Therefore, assuming that the frame length of the signal from the buffer 21-1 shown in FIG. 1 and the frame length of the signal output from the buffer 21-2 are the same, the signal of the channel CH 2 is transmitted from the communication network 10 to the communication network 13. The delay time required for transmission can be reduced by (1 + 1 / W) / (1 + L) times as compared with the case of outputting every conventional frame. Therefore, with a short delay time, the channel CH1 can maintain communication at a low speed but with a sufficiently small error rate, and the channel CH2 can maintain communication at high speed. As shown in FIG. 2, even when the number of channels is N, it is possible to suppress an increase in the delay time of channel signals excluding the channel whose communication data has increased due to encoding, for various frame lengths. It can be verified by calculating. In addition, as shown in FIG. 2, when encoders are provided for a plurality of channels, encoding is performed with a predetermined encoding method for each channel, so that an allowable bit error rate is ensured for each communication channel, and the communication environment is deteriorated. Even in such a case, a communicable channel can be secured. Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.

  The transmitter 27 shown in FIG. 1 transmits the multiplexed signal output from the multiplexer 23 in a predetermined communication method, for example, Ethernet (registered trademark) format. In this case, FIG. 1 shows a mode in which the multiplexed signal is converted into light and transmitted via the optical transmission line 30. However, as shown in FIG. 3, the multiplexed signal is multiplexed by a radio signal 32 from a transmission antenna (not shown). The transmission signal may be transmitted. In this case, the transmitter 27 is a modulator in a radio frequency band. When light is applied as a multiplexed signal transmission method, high-speed communication is possible without being affected by electromagnetic waves, and when wireless is applied, the installation position of the transmission device is not limited, so the transmission device can communicate from any location. Can be used as a wireless device capable of

  The setting unit 25 shown in FIG. 1 sets the weight, the spreading code, or the code length of the spreading code. By setting the weight, the spread code, or the code length of the spread code with the setting unit 25, it becomes possible to flexibly change the transmission conditions in the transmission device 11 according to the communication environment.

  The setting unit 25 can also set a weight based on the buffer amount of each channel measured by the buffer amount measuring unit 26. As a change in the communication environment, an increase or decrease in the buffer amount of each channel can be considered. Therefore, by changing the weight according to the increase / decrease of the buffer amount, for example, the effective value of the transmission rate can be maintained. Here, setting the spreading code means setting, for example, an array of 0s or 1s of spreading codes.

  Further, when the buffer amount of a certain channel is 0, the communication band can be efficiently used if the weight of the buffer amount is set to 0 and no contribution is made to multiplexing. That is, in FIG. 1, when the buffer amount of the channel CH1 measured by the buffer amount measuring device 26 is defined as the buffer amount B1, when the buffer amount B1 is 0, the weights W1 and W2 for the channels CH1 and CH2 are respectively set as W1 = 0 and W2 = 1. On the other hand, when the buffer amount B1 is larger than 0, the weights W1 and W2 for the channels CH1 and CH2 are set to W1 = 1 and W2 = W, respectively. The setting unit 25 dynamically changes and sets the weight according to the buffer amount in this way, so that when the buffer amount B1 is 0, only the communication data of the signal from the buffer of the channel CH2 can be read. It is because it becomes.

  The setter 25 receives the weight determined by the receiving device 12 described later, the code length of the spread code or the spread code by the receiver 56, the weight according to the received weight, the spread code or the code length of the spread code, Although it is possible to set a spread code or a code length of the spread code, this will be described together with the description of the configuration of the reception device 12. Further, the notification signal generator 53 generates a signal for notifying the buffer amount of each channel as information for causing the receiving device 12 to determine the weight, spreading code or code length of the spreading code, and outputs the signal as a signal of the channel CH1. .

  1 includes a receiver 40 that converts a multiplexed signal transmitted from the transmitter 27 of the transmitter 11 into an electrical signal corresponding to a communication method in the transmitter 27, and outputs the electrical signal. A distributor 41 that distributes the multiplexed signal output from 40 into two, and a decoder that decodes and outputs one of the multiplexed signals output from the distributor 41 in accordance with the encoding method in the transmission apparatus 11 Instrument 42. The receiving device 12 outputs the other of the multiplexed signals output from the distributor 41 in the form of a signal output from the multiplexer 23 of the transmitting device 11 and is output from the decoder 42. An error rate measuring unit 63 for measuring the bit error rate of the signal to be transmitted, weights for the channels CH1 and CH2 and a spreading code or spreading for the channel CH1 in the transmission device 11 based on the bit error rate measured by the error rate measuring unit 63 A weight / code determiner 44 that determines the code length of the code, and a transmitter 66 that transmits the weight, spread code, or code length of the spread code determined by the weight / code determiner 44 to the transmission apparatus using a predetermined communication method. And having. The receiving device 12 further includes a data processing unit 45 that processes the communication data output from the distribution decoding unit 46. The weight / code determiner 44 and the transmitter 66 are included in a part of the notification device that notifies the weight, the spread code, or the code length of the spread code.

  In the case of the form shown in FIG. 1, the receiver 40 receives the multiplexed signal via the optical transmission path 30 when converting the multiplexed signal into an electrical signal. The multiplexed signal is received and converted into an electrical signal. This electric signal may be output as analog as it is, or may be output after being converted into a digital signal using a necessary comparator (not shown). On the other hand, in the case of wireless communication as in the multiplex communication system 4 shown in FIG. 3, a multiplexed signal received by an antenna (not shown) may be demodulated and output, or a necessary comparator (not shown). ) May be converted into a digital signal and output.

  The decoder 42 decodes the multiplexed signal distributed as a signal having the same bit string configuration by the distributor 41 in accordance with the encoding scheme for the channel CH1 in the transmission apparatus 11. Further, the regenerator 43 identifies and reproduces the multiplexed signal output from the multiplexer 23 of the transmission device 11 and outputs the multiplexed signal distributed as a signal having the same bit string configuration by the distributor 41. When a multiplexed signal is output as a digital signal from the receiver 40, the decoder 42 can perform decoding by extracting only the encoded signal and correlating it with the spreading code. The regenerator 43 may output the multiplexed signal output from the distributor 41 as it is. On the other hand, when a multiplexed signal is output as an analog signal from the receiver 40, it is desirable that the decoder 42 and the regenerator 43 have a configuration described below.

  FIG. 7 shows a block configuration diagram of a decoder and a regenerator according to one embodiment.

  The decoder 42 shown in FIG. 7 includes a correlator 421 that correlates the multiplexed signal output from the distributor 41 and the spreading code for the channel CH1 in the transmission apparatus, and a correlation signal 93 output from the correlator 421. A clock data regenerator 422 as a second data regenerator that synchronizes with the clock signal reproduced from the correlation signal 93 to identify and reproduce the signal of the channel CH1 and outputs a clock signal synchronized with the clock signal reproduced from the correlation signal 93. And having.

  The correlator 421 can be configured as described below, for example. FIG. 12 is a block diagram showing an example of a correlator. FIG. 13 is a block diagram of a surface acoustic wave matched filter in the correlator shown in FIG. Here, it is assumed that baseband transmission is performed between the transmitter 27 and the receiver 40 illustrated in FIG. 1.

  A correlator 500 shown in FIG. 12 includes an inverting circuit 111 that inverts one of the multiplexed signals, a level shift circuit 112 that shifts the level of the output signal from the inverting circuit 111, and an output from the level shift circuit 112. A modulation circuit 114 that modulates the signal at the frequency fs, a modulation circuit 113 that modulates the other of the multiplexed signals branched at the frequency fs, a branch of the output from the modulation circuit 113, and “1” in the spreading code , A surface acoustic wave matched filter 118 that correlates the other with “0” in the spreading code, and one that splits the output from the modulation circuit 114 and “1” in the spreading code. , A surface acoustic wave matched filter 117 that correlates with the other code and “0” in the diffusion code, A rectifier circuit 119 for rectifying a signal obtained by adding the output signals from the surface wave matched filter 115 and the surface acoustic wave matched filter 116, a low pass filter 120 for removing a high frequency component from the output signal from the rectifier circuit 119, and a surface acoustic wave. A rectifier circuit 121 that rectifies a signal obtained by adding the output signals from the matched filter 117 and the surface acoustic wave matched filter 118, a low-pass filter 122 that removes a high-frequency component from the output signal from the rectifier circuit 121, and a low-pass filter 122 An inverting circuit 123 that inverts the output signal, and a demodulation circuit 124 that demodulates a signal obtained by adding the outputs from the low-pass filter 120 and the inverting circuit 123 at the modulation frequency fs.

  Here, as shown in FIG. 13, the surface acoustic wave matched filter is a surface acoustic wave matched filter 115 that correlates the input signal with “1” in the spreading code or the correlation between the input signal and “0” in the spreading code. Each of the surface acoustic wave matched filters 115, 116 transmits the piezoelectric substrate 140, the transmission electrode 131 disposed on the piezoelectric substrate 140, and the piezoelectric substrate 140. And an electrode 131 and a receiving electrode 133 arranged at a predetermined distance between the electrodes.

  The distance between the electrodes is determined from the modulation frequency fs shown in FIG. 12 and the sound velocity of the material of the piezoelectric substrate 140 shown in FIG. The electrical signal input to the transmission electrode 131 excites a surface acoustic wave due to the piezoelectric effect of the piezoelectric substrate 140. The excited surface acoustic wave propagates on the piezoelectric substrate 140, reaches the reception electrode 133, and is converted into an electric signal again by the reception electrode 133. At this time, the arrangement of the reception electrode 133 is set according to the spreading code and the multiplexing weight on the transmission side. As a result, the maximum output is obtained when the receiving electrode 133 and the waveform of the excited surface acoustic wave coincide. The above is a description of the surface acoustic wave matched filter 115 that correlates with “1” in the spreading code. However, the principle of the surface acoustic wave matched filter 116 that correlates with “0” in the spreading code is also described. It is the same.

  12 and 13 show an example in which the spreading code is “1011”, and when the original signal of the channel CH1 is “1” as shown in FIG. The signal transmitted from is a multiplexed signal ("1 ... 0 ... 1 ..."). Here, “...” Indicates a signal of the channel CH2. In the correlator 500, the received multiplexed signal is inverted by the inversion circuit 111 among the multiplexed signals to the surface acoustic wave matched filter 115 "0 ... 1 ... 0 ...". Are input to the surface acoustic wave matched filter 116, respectively. As shown in FIG. 13, the surface acoustic wave matched filter 115 excites surface acoustic waves only when the signal is “1”. The excited surface acoustic wave 132 propagates on the piezoelectric substrate 140 and reaches the reception electrode 133. A part of the surface acoustic wave 132 is converted into an electric signal by the receiving electrode 133, and a part still propagates further. When the first signal “1” input to the surface acoustic wave matched filter 115 reaches the reception electrode 137, it is excited on all reception electrodes of the surface acoustic wave matched filter 115 and the surface acoustic wave matched filter 116. In addition, the surface acoustic waves 132 and 135 are present, and the output electric signal is maximized, and a correlation peak can be obtained. For the original signal “0”, a correlation peak is obtained from the combination of the surface acoustic wave matched filter 117 and the surface acoustic wave matched filter 118 shown in FIG.

  Note that the correlator 421 shown in FIG. 7 is not limited to the configuration to which the surface acoustic wave matched filter described in FIG. 12 is applied as long as it can output the correlation between the input signal and the spread code. Similarly, the transmission method between the transmitter 27 and the receiver 40 shown in FIG. 1 is not limited to baseband transmission.

  Thus, by obtaining the correlation between the multiplexed signal and the spreading code, the signal of channel CH1 can be decoded without using a separate clock signal.

  Further, for example, a PLL (Phase Locked Loop) circuit can be applied to the clock data regenerator 422 shown in FIG.

  FIG. 9 is a block diagram showing an example of the clock data regenerator.

  A clock data regenerator 503 shown in FIG. 9 includes a PLL circuit 83 that extracts a clock signal from an input signal to IN, a clock detection circuit 84 that detects a clock signal input to REF and outputs “1”, A signal switching circuit 85 that outputs a clock signal input to the REF when the signal “1” is input from the clock detection circuit 84 and a clock signal from the PLL circuit 83 when the signal “0” is input; and a signal switching circuit And a latch circuit 86 that latches and outputs an input signal to IN in synchronization with the rising edge of the clock output from 85. The output from the signal switching circuit 85 is branched from the input signal to the latch circuit 86 and output as a clock signal.

  Here, the clock of the input signal input from IN is extracted by the PLL circuit 83. Here, if the clock signal input to REF is detected by the clock detection circuit 84, the signal switching circuit 85 outputs the clock signal input to REF. The latch circuit 86 latches the input signal to the IN in synchronization with the rising edge of the clock signal output from the signal switching circuit 85 and outputs a data signal.

  Note that the clock data regenerator 422 illustrated in FIG. 7 is not limited to the circuit configuration illustrated in FIG. 9 as long as the clock signal and the data signal can be extracted from the input signal.

  Thus, by extracting the clock signal from the correlation signal 93, the clock can be extracted efficiently. The clock signal output from the clock data regenerator 422 is used in the regenerator 43 described later.

  The regenerator 43 shown in FIG. 7 includes a delay unit 431 that delays the multiplexed signal for a predetermined time, and a first data regenerator that regenerates the multiplexed signal from the delayed signal output from the delay unit 431 and the first reference signal 95. As a data regenerator 434 and a signal selector 433 for selecting a clock signal from the clock data regenerator 422 of the decoder 42. In addition, the regenerator 43 includes a multiplier 432 that multiplies the clock signal by a predetermined multiplication number in order to match the bit rate of the clock signal with the bit rate of the multiplexed signal in accordance with the frequency of the clock signal.

As the multiplier 432, for example, a PLL circuit can be applied. In the present embodiment, as shown in FIG. 6, in the multiplexed signal, an uncoded signal of W bits of channel CH2 is inserted between each bit of the coded signal of channel CH1 of L bits. Assuming that the bit rate of the clock signal output from the clock data regenerator 422 of the decoder 42 is 1 / {L × (1 + W)} bit / s, the multiplication number m in the multiplier 432 is
m = L × (1 + W)
It becomes. In the present embodiment, the case of a multiplexed signal with two channels is shown, but in the case of a multiplexed signal with N channels, it can be the frame length of the multiplexed signal, It can be determined according to the weight / code length set in the transmission apparatus.

  For example, the delay unit 431 may shift the phase of the multiplexed signal by passing the multiplexed signal through a delay line, or may change only the phase characteristic of the multiplexed signal by an all-pass filter composed of LRC. Good. Here, a specific configuration example of the delay device will be described.

  FIG. 10 is a block diagram showing an example of the delay unit. FIG. 11 is a block diagram of a surface acoustic wave delay line in the delay device shown in FIG.

  10 includes a modulation circuit 87 that modulates an input signal at a frequency fs, a surface acoustic wave delay line 88 that delays an output signal from the modulation circuit 87 for a predetermined time, and a surface acoustic wave delay line 88. A rectifier circuit 89 that rectifies the output signal; a low-pass filter 97 that removes high-frequency components from the output signal from the rectifier circuit 89; and a demodulator circuit 98 that demodulates the output signal from the low-pass filter 97 and extracts the original signal. . Here, as shown in FIG. 11, the surface acoustic wave delay line 88 includes a piezoelectric substrate 99, a transmission electrode 101 disposed on the piezoelectric substrate 99, and the transmission electrode 101 on the piezoelectric substrate 99 and a predetermined number. And a receiving electrode 102 arranged with a distance between the electrodes.

  In the surface acoustic wave delay line 88 shown in FIG. 11, the pitch between the transmission electrode 101 and the reception electrode 102 and the distance between the transmission electrode 101 and the reception electrode 102 are the modulation frequency fs and the piezoelectric substrate 99. And the sound speed of the material. The electric signal input to the transmission electrode 101 excites the surface acoustic wave 100 due to the piezoelectric effect of the piezoelectric substrate 99. The excited surface acoustic wave 100 propagates on the piezoelectric substrate 99, reaches the reception electrode 102, is converted into an electrical signal again by the reception electrode 102, and is output. At this time, since it is delayed by the propagation time between the transmitting electrode 101 and the receiving electrode 102, the input signal to the surface acoustic wave delay line 88 is delayed for a predetermined time by setting the distance between the electrodes to an appropriate distance. Can do.

  The delay device 431 shown in FIG. 7 is not limited to the configuration to which the surface acoustic wave delay line 88 shown in FIG. 10 is applied as long as the signal can be delayed for a predetermined time.

  In the present embodiment, it is desirable that the delay time d in the delay device 431 is d = m × n. Here, m is the above multiplication number. Further, n is the number of bits of the correlation signal 93 required until the clock data regenerator 422 of the decoder 42 of the channel CH1 generates and outputs a clock signal from the correlation signal 93 from the correlator 421. As a result, the first bit of the clock signal from the clock data regenerator 422 can be synchronized with the first bit of the signal of the channel CH2 included in the multiplexed signal. Therefore, the multiplexed signal is not delayed more than necessary and the transmission rate is not reduced. In the present embodiment, the case of a multiplexed signal with two channels is shown, but in the case of a multiplexed signal with N channels, m is the frame length of the multiplexed signal for the delay time di. Then, n is the number of bits of the correlation signal 93 required until the clock data regenerator 422 of the decoder 42 of a certain channel generates and outputs a clock signal from the correlation signal 93 from the correlator 421. be able to. Here, when the weight for the encoded channel is 1, and the weight Wi for the non-encoded channel is equal to all channels, di is a natural number multiple of Lj × (1 + Wi).

  The data regenerator 434 has the same configuration as that of the clock data regenerator 422 of the decoder 42, identifies and reproduces the multiplexed signal from the delay signal 96 from the delay unit 431 and the first reference signal 95, and outputs the multiplexed signal. . Here, only the delay signal 96 from the delay device 431 can be used as the first reference signal 95, but it is desirable to use the clock signal from the multiplier 432. As described above, when the clock signal generated in advance by the clock data regenerator 422 is used as the first reference signal 95, the multiplexed signal can be identified and reproduced with high stability, and the multiplexed signal or the clock data regenerator 422 can be used. By selecting one of these clock signals and using it as a clock signal for data reproduction, it is possible to efficiently use the communication band while preventing reproduction errors.

  The signal selector 433 selects and outputs the clock signal from the multiplier 432 as the first reference signal 95. Here, when there is no input to the channel CH1 in the transmission device, no clock signal is output from the clock data regenerator 422 of the decoder 42. Therefore, when selecting a signal, the signal selector 433 moves to the channel CH1 in the transmission device. Is selected, the clock signal is selected. Note that the presence / absence of input to channel CH1 in the transmission apparatus is detected by determining whether or not the signal of channel CH1 output from the clock data regenerator 422 is detected by a weight / code determiner 44 described later. In this way, by selecting and outputting the signal by the signal selector 433, it is possible to efficiently use the communication band while preventing a reproduction error without using a non-communication signal.

  Although FIG. 1 shows the receiving device 12 in which one decoder 42 is provided in the channel in accordance with the configuration of the transmitting device 11, the communication channel is the same as in the other mode shown in FIG. N can be provided in accordance with 70 configurations. In FIG. 2, the decoders 42-1 to 42-N are provided for all of the N channels. However, the decoder 42 is changed to p channels out of the N channels in accordance with the configuration of the transmission device 70. It is also possible to provide -1 to 42-p and not provide a decoder for (Np) channels excluding p. The configuration of the decoder in this case will be described.

  FIG. 8 is a block configuration diagram of a decoder according to an embodiment when two or more decoders are provided.

  The decoder 42-1 shown in FIG. 8 is a delay unit that delays the multiplexed signal for a predetermined time before the clock data regenerator 422 in addition to the correlator 421 and the clock data regenerator 422 shown in FIG. 423, a signal selector 425 that outputs a clock signal as the second reference signal 94 upon detection of a clock signal output from the clock data regenerator of any of the other decoders, and a clock at the preceding stage of the signal selector 425 A multiplier 424 that multiplies the signal by a predetermined multiplication number. In addition, in FIG. 8, a clock signal selector 426 that selects a clock signal from any one of (N−1) decoders is further included.

  The delay unit 423 has the same configuration as that of the delay unit 431 of the regenerator 43 described in FIG. 7, and outputs the clock signal of any channel shown in FIG. 8 and the first bit of the multiplexed channel CH1 signal. Can be synchronized. Similarly, the multiplier 424 has the same configuration as the multiplier 432 described with reference to FIG. 7, and the bit rate of the clock signal is set to the clock data regenerator 422 according to the frequency of the clock signal of any channel shown in FIG. This is provided to match the bit rate of the multiplexed signal to be input.

  The clock signal selector 426 selects and outputs one of clock signal inputs. In this way, by selecting and outputting the signal by the clock signal selector 426, it is possible to efficiently use the communication band by preventing reproduction errors without using a non-communication signal. At this time, as the clock signal in the clock signal selector 426 shown in FIG. 8, the clock signal of the channel having the longest code length with the weight greater than 0 is selected as the second reference signal of the decoders of all other channels. May be. Even in a deteriorated communication environment, a stable reference signal can be obtained. Further, the signal selector 425 employs the clock signal as the second reference signal 94 when any clock signal is input. In this way, by selecting and outputting the signal by the signal selector 425, it is possible to efficiently use the communication band by preventing reproduction errors without using a non-communication signal. In the clock signal selector 426 and the signal selector 425, detection of the input of the clock signal is performed by a weight / code determiner 44 described later.

  When the clock signal generated in advance by the clock data regenerator 422 is used as the second reference signal 94, the encoded signal can be identified and reproduced with high stability, and the correlation signal or the clock signal from the clock data regenerator 422 can be obtained. By selecting one of these and using it as a clock signal for data reproduction, it is possible to prevent a reproduction error and efficiently use the communication band. Here, when each of the decoders 42-1 to 42-N shown in FIG. 2 has the configuration shown in FIG. 8, at least one of the N decoders 42-1 to 42-N shown in FIG. This decoder needs to be the decoder 42 shown in FIG. This is because any one clock signal needs to be extracted from the multiplexed signal. Further, it is naturally not possible to mutually input clock signals for any two decoders having the configuration shown in FIG. In FIG. 8, since the decoder 42-1 for decoding the signal of the channel CH1 is shown, the clock signal input to the clock signal selector 426 is changed from the channel CH2 to the channel CHN except for the channel CH1. When the decoder for another channel has the configuration shown in FIG. 8, a clock signal excluding the clock signal of the other channel is input to the clock signal selector 426.

  The weight / code determiner 44 shown in FIG. 1 determines the magnitude of the weight, the spread code, or the code length of the spread code based on the multiplexed signal received from the transmitter 11. Further, the weight / code determiner 44 sets the correlation code of the correlator 421 in the decoder 42 shown in FIG. 7, the setting of the multiplication number in the multiplier 432, the setting of the delay time in the delay unit 431, and the signal selector. The signal selection at 433, the signal selection at the clock signal selector 426 shown in FIG. 8, the setting of the correlation code of the correlator 421, the setting of the delay time at the delay unit 423, and the setting of the multiplication number at the multiplier 424 are performed. Further, the weight / code determiner 44 shown in FIG. 1 transmits the determined weight, spreading code or code length of the spreading code from the transmitter 66 to the transmitter 11 via the transmission path 31. Here, the transmission line 31 can be an optical transmission line laid in parallel with the optical transmission line 30. In addition, the encoding / weight notification signal transmitter may use a wavelength region different from the wavelength region used by the transmitter in the physical medium of the optical transmission line 30. Further, as in the form shown in FIG. 3, the wireless signal 34 may transmit a weight, a spread code, or a code length of the spread code. The setting device 25 of the transmission device 11 sets the weight, the spread code, or the code length of the spread code for the channels CH1 and CH2 according to the weight, the spread code, or the code length of the spread code transmitted from the reception device 12.

  As described above, by performing transmission control of the transmission device 11 in the reception device 12, it is possible to perform communication while recognizing the transmission state of the transmission device 11 in the reception device 12. Therefore, even when the communication environment deteriorates, the communication environment can be quickly recovered by changing the weight, the spread code, or the code length of the spread code.

  Further, the weight / code determining unit 44 sets the code length of the weight, spreading code or spreading code so that the bit error rate measured by the error rate measuring unit 63 is equal to or less than the allowable bit error rate predetermined for the channel CH1. decide. For example, the code length is set longer as the bit error rate measured by the error rate measuring unit 63 is larger. Further, since it is considered that there is a decoding error in the decoder 42 as the bit error rate increases, for example, the correlation accuracy in the correlator 421 shown in FIG. Also good. Similarly, the arrangement of spreading codes may be determined.

  In this way, by providing the weight / code determiner 44, it is possible to dynamically set the weight, spreading code or code length of the spreading code with respect to the bit error rate of the encoded signal. It is possible to prevent the rate from increasing rapidly and maintain the communication environment without deteriorating.

  Here, in the transmission apparatus 11 shown in FIG. 1, when the weight for the channel CH1 signal is W1, the weight for the channel CH2 signal is W2, and the allowable bit error rate for the channel CH1 signal is e, the weight / code The determiner 44 determines that the bit error rate measured by the error rate measuring unit 63 is em, and determines the code length of the spread code as L1 when em is less than e, and the code of the spread code when em is greater than or equal to e. The length is determined as L2.

  When the bit error rate increases in this way, the code length is increased to lower the bit error rate of the channel CH1. On the other hand, if the bit error rate is equal to or less than the allowable bit error rate, the communication condition is satisfied. Therefore, the effective communication speed of the signal of the channel CH1 is reduced by shortening the code length and suppressing the increase in the amount of communication data due to encoding. And the communication band can be used efficiently.

  Further, the weight / code determiner 44 illustrated in FIG. 1 acquires the buffer amounts stored in the buffers 21-1 and 21-2 of the transmission device 11 from the notification signal output from the notification signal generator 53. Then, based on the acquired buffer amount and the bit error rate measured by the error rate measuring unit 63, the size of the weight, the spreading code or the code length of the spreading code is determined. Here, for example, the bit error rate may increase when the code length is set short or the weight is set large in order to reduce the communication data of the buffer having a large buffer amount acquired by the notification signal. The weight / code determiner 44 sets the weight, spreading code, or code length of the spreading code in consideration of the trade-off between the bit error rate and the buffer amount.

  Thus, even if the buffer amount increases, communication is performed by setting the weight, the spreading code, or the code length of the spreading code based on the buffer amount stored in the transmitting device 11 and the bit error rate in the receiving device 12. It can be maintained without deteriorating the environment.

  Although FIG. 1 shows the receiving device 12 in which one decoder 42 is provided for the channel CH1 in accordance with the configuration of the transmitting device 11, the communication channel is the transmitting device as shown in FIG. N can be provided in accordance with 11 configurations. In FIG. 2, the decoders 42-1 to 42-N are provided for all of the N channels, but the decoders are provided for the p channels among the N channels in accordance with the configuration of the transmission apparatus 11. It can also be provided. In this case, one error rate measuring device is provided for each channel provided with a decoder, and the weight / code determining unit 44 uses weight, spreading code based on the error rate measured for each channel by each error rate measuring device. Alternatively, the code length of the spread code is determined.

  Further, the data processing unit 45 of the receiving device 12 illustrated in FIG. 1 processes communication data as necessary and transmits the communication data to the communication network 13. For example, processing of communication data performed by the data processing unit 45 includes insertion / deletion of a VLAN (Virtual Local Area Network) tag.

  The configuration of the multiplex communication system according to the present embodiment has been described above. However, as illustrated in FIGS. 4 and 5, M transmission apparatuses may be provided as the transmission apparatuses 70-1 to 70 -M. 4 shows a mode in which optical communication is performed between the transmission devices 70-1 to 70-M and the reception device 80. The multiplex communication system 6 shown in FIG. -1 to 70-M and a receiving apparatus 80 perform wireless communication. When performing optical communication as shown in FIG. 4, an optical splitter 33 is provided in the optical transmission line 30, and the signal lights output from the transmission devices 70-1 to 70 -M are combined and transmitted to the reception device 80. .

  4 and FIG. 5 includes M distribution decoding units described above as distribution decoding units 82-1 to 82-M. In the receiver 80 shown in FIG. 4, the receiver 40 receives M multiplexed signals received from the M transmitters 70-1 to 70 -M for each of the multiplexed signals. Output from -1 to 82-M. The receiver 40 applies, for example, TDMA (Time Division Multiple Access) using a different time slot for each transmission apparatus, WDMA (Wave Division Multiple Access) using a different wavelength, or CDMA (Code Division Multiple Access) using a different code. Can be demultiplexed.

  In the receiving apparatus 80 shown in FIG. 5, the receiver 40 receives M multiplexed signals received from the M transmitting apparatuses 70-1 to 70 -M for each of the multiplexed signals. Output from -1 to 82-M. In this case, the receiver 40 is a radio duplexer, and for example, a demodulator in a radio frequency band can be applied.

  As shown in FIGS. 4 and 5, in the one-to-many multiplex communication systems 5 and 6, since the signals of all channels are bit-multiplexed in the transmission apparatuses 70-1 to 70-M, the number of channels increased by encoding. It is possible to suppress an increase in delay time of other channels except for. In addition, since the weight for the bit string is set according to the buffer amount in the transmission devices 70-1 to 70-M, it is possible to suppress an extreme difference in transmission waiting time, and there is a channel with a buffer amount of 0. However, since no vacant bits are created in the multiplexed signal when bit multiplexing is performed, the communication band can be used efficiently. Further, by detecting the bit error rate in the receiving device 80 and feeding back to the transmitting devices 70-1 to 70-M to reset the code length, communication below the allowable bit error rate becomes possible and the communication environment is degraded. Can be maintained.

  Next, the multiplex communication method according to the present embodiment will be described with reference to FIGS. 2, 7, and 8, for the sake of convenience, encoding is performed with p encoders and decoding is performed with p decoders. Any p of the encoders and decoders can be used. 2, 7 and 8, the encoder and the decoder are provided for encoding and decoding. However, by setting the code length to 1, the encoder and the decoder are not subjected to encoding and decoding. A signal can also be passed. Therefore, encoding and decoding are not performed on (Np) channel signals excluding p channel signals to be encoded and decoded out of N channel signals.

  When transmitting apparatus 70 shown in FIG. 2 transmits a multiplexed signal obtained by multiplexing N channel signals, transmitting apparatus 70 encodes p channel signals out of N channel signals into encoder 22. -1 to 22-p are encoded by a predetermined encoding method. As described above, the encoding can be exemplified by encoding applied when encryption, audio / video signal compression, information compression, error correction, or modulation by spreading code is performed. Further, (Np) channel signals excluding p channel signals out of N channel signals are output as they are without being encoded by the encoder.

  Then, in the multiplexer 23, predetermined weights are respectively applied to the bit strings of the p encoded signals from the encoders 22-1 to 22-p and the (Np) non-encoded channel signals. To generate a multiplexed signal. Then, it transmits from the transmitter 27 by a predetermined communication method. The communication method from the transmitter 27 may be wireless or wired as described above.

  Thus, by performing the encoding process for each channel, a different allowable bit error rate can be set for each channel. Therefore, a flexible communication environment can be selected depending on the type of communication data. Further, in the transmission device 70, by assigning different weights to the bit strings of the encoded signals for each channel and multiplexing the signals, even if the communication data amount increases due to encoding for a signal of a certain channel, the increased communication data Since signals of other channels can be transmitted without waiting for the end of transmission, an increase in delay time of other channels can be suppressed. In addition, since a plurality of channels are encoded by a predetermined encoding method for each channel, an allowable bit error rate can be ensured for each communication channel, and a channel that can communicate even if the communication environment deteriorates can be secured. . Furthermore, if the weight, code, or code length is changed, the communication band can be efficiently used even if the communication data increases or decreases for each channel.

  Next, when the receiving device 80 oppositely connected to the transmitting device 70 receives the multiplexed signal transmitted from the transmitting device 70, the receiving device 80 receives the multiplexed signal transmitted from the transmitting device 70 as the receiver 40. Is received and output as an electrical signal. Here, as described above, the receiver 40 receives the multiplexed signal in accordance with the communication method from the transmitter 27 of the transmission device 70. That is, when the transmitter 27 performs optical communication, the receiver 40 is an optical receiver, and when the transmitter 27 performs wireless communication, the receiver 40 is a wireless receiver. Then, the receiving device 80 distributes the multiplexed signal received by the receiver 40 into N by the distributor 41, and among the multiplexed signals of p, the transmitting device 70 uses the decoders 42-1 to 42-p. Decoding is performed for each channel corresponding to the encoding method.

  Here, a description will be given of a multiplex communication method when a direct spreading method using a spreading code is adopted as an encoding method.

  The receiver 80 shown in FIG. 2 performs automatic gain amplification when outputting the multiplexed signal received by the receiver 40 as an electrical signal. And it distributes to N pieces with the divider | distributor 41. FIG. Thereafter, the receiving apparatus 80 uses the data regenerator 434 shown in FIG. 7 to obtain (Np) multiplexed signals excluding p multiplexed signals from the distributed N multiplexed signals, respectively, from the delayed signal 96. The multiplexed signal is identified and reproduced in synchronization with the reproduced clock signal or first reference signal 95. 2 has the regenerators 43 shown in FIG. 7 for the signals of (Np) channels, and performs the above-described identification reproduction for each regenerator.

  On the other hand, when the receiving apparatus 80 shown in FIG. 2 decodes p channel signals from p multiplexed signals, the correlator 421 shown in FIG. The correlated correlation signal 93 having the correlation is synchronized with the clock signal regenerated from the correlation signal 93 in the clock data regenerator 422, and one of the signals of the N channels is identified and reproduced. The clock data regenerator 422 identifies and reproduces the signal and outputs a clock signal synchronized with the clock signal regenerated from the correlation signal 93. Note that the receiving apparatus 80 shown in FIG. 2 has the decoder 42 shown in FIG. 7 for each of the N channel signals, and performs the above-described identification reproduction for each decoder.

  Here, as the clock signal used for data recovery in the clock data recovery unit 422, the clock signal from the correlation signal 93 output from the correlator 421 shown in FIG. 7 can be used. As shown in FIG. Any one of the clock signals output from the clock data regenerator can be selected and used by the clock signal selector 426 and the signal selector 425. In this case, the signal selection by the clock signal selector 426 and the signal selector 425 is performed by detecting the encoded channel signal output from the clock data regenerator of each channel by the weight / code determiner 44. And The clock data regenerator 422 discriminates and regenerates the signal and outputs a clock signal regenerated from the correlation signal 93 or a clock signal synchronized with the second reference signal 94. In addition, the multiplexed signal is delayed in advance by the delay unit 423 in order to align the heads of the bits. Note that the delay by the delay unit 423 may be performed after the correlator 421.

  In this way, by correlating the multiplexed signal and the spread code by the correlator 421 shown in FIG. 7, it is possible to decode the encoded channel signal without using a separate clock signal. Further, as shown in FIG. 8, when the clock data regenerator 422 performs identification and reproduction, the second reference signal 94 can be stably used by using a clock signal generated in advance by a clock data regenerator of another channel. In addition to being able to identify and regenerate, by selecting either the correlation signal or the clock signal from another clock data regenerator and using it as the data regenerative clock signal, it is possible to prevent a reproduction error and to efficiently reduce the communication band. Can be used.

  Further, as a clock signal used for data recovery in the data regenerator 434, a clock signal from a multiplexed signal output from the distributor 41 as shown in FIG. 7 can be used, and clock data recovery of p decoders is also possible. Any one of the clock signals output from the device can be selected and used. In this case, the signal selection is performed by detecting the signal of the encoded channel output from the clock data regenerator of each channel by the weight / code determining unit 44. In addition, the multiplexed signal is delayed in advance by the delay unit 431 in order to align the heads of the bits.

  As described above, when the data regenerator 434 performs identification and reproduction, by using the clock signal generated in advance by the clock data regenerator 422 as the first reference signal 95, it is possible to perform stable identification and reproduction. By selecting either the multiplexed signal or the clock signal from the clock data regenerator 422 and using it as a data regenerative clock signal, it is possible to prevent a reproduction error and efficiently use the communication band.

  2 receives the bit error rate for each channel from the error rate measuring units 63-1 to 63-p from the signals of p channels decoded by the decoders 42-1 to 42-p. taking measurement. Then, the measured p bit error rates are obtained by the weight / code determiner 44, and the weights of the N channel signals and p are set so that the bit error rate of each channel is equal to or lower than the allowable bit error rate. The code length of the spreading code or spreading code for the signals of the channels is determined. The determined weight, spreading code, or code length of the spreading code is notified to the transmitter 70 by the transmitter 66 by a predetermined communication method.

  On the other hand, the transmitter 70 receives the magnitude of the weight, the code length of the spread code or the spread code notified from the receiver 80 by the receiver 56, and sets the setter according to the received weight, the code length of the spread code or the spread code. In 25, the size of the weight, the spread code, or the code length of the spread code is set. In the receiving device 80, for example, the code length of the spread code is increased as the bit error rate increases beyond the allowable bit error rate, and the code length of the spread code is decreased as the bit error rate decreases below the allowable bit error rate. Set to short. Also, for example, the weight is increased as the bit error rate increases beyond the allowable bit error rate, and the weight is set smaller as the bit error rate decreases below the allowable bit error rate. It is considered that the bit error rate can be lowered because the amount of encoded signal included per unit length increases by increasing the weight.

  In this way, the bit error rate is monitored on the receiving device 80 side, and the weight, spread code or code length of the spread code is determined so that the bit error rate of each channel is equal to or less than the allowable bit error rate. Thus, even if communication data increases, the communication environment can be maintained without deteriorating.

  2 stores in advance in the buffers 21-1 to 21-N for each channel before multiplexing the signals of N channels, and stores the amount of the stored signals of N channels. Measurement is performed for each buffer by the buffer amount measuring device 26. Then, a notification signal for notifying the measured buffer amount is generated by the notification signal generator 53, stored in the buffer 21-p, encoded by the encoder 22-p, and transmitted. The notification signal may be stored in any of the p buffers 21-1 to 21-p.

  On the other hand, the receiving device 80 uses the weight / code determining unit 44 to increase the weight based on the notification signal transmitted from the transmitting device 70 and the p bit error rates measured by the error rate measuring units 63-1 to 63-p. Then, the spread code or the code length of the spread code is determined. Here, for example, in order to reduce the communication data of the buffer having a large buffer amount acquired by the notification signal, it is considered that the bit error rate increases when the code length is set short or the weight is set large. The weight / code determiner 44 sets the weight, spreading code, or code length of the spreading code in consideration of the trade-off between the bit error rate and the buffer amount.

  As described above, even if the buffer amount increases, communication is performed by setting the weight, the spread code, or the code length of the spread code based on the buffer amount stored in the transmission device 70 and the bit error rate in the reception device 80. It can be maintained without deteriorating the environment.

  Further, when the weight Wi and the code length Lj of the spreading code are set to predetermined values corresponding to the buffer amount measured by the buffer amount measuring unit 26 in the transmission device 70 shown in FIG. When reproducing, the receiving device 80 delays the delay time by the delay device 431 shown in FIG. 7 by a predetermined time di.

  By setting the predetermined time to di, it is possible to match the leading bits of the non-coded (Np) channel signals of the multiplexed signal with the leading edge of the clock signal. Therefore, the communication speed can be maintained without unnecessary delay.

  The multiplex communication system and multiplex communication method of the present invention can be applied not only as a trunk network such as a relay network but also as a multiplex communication system and a multiplex communication method when constructing a local area network and an access network.

1 is a block configuration diagram of a multiplex communication system according to an embodiment. 1 is a block configuration diagram of a multiplex communication system according to an embodiment. 1 is a block configuration diagram of a multiplex communication system according to an embodiment. 1 is a block configuration diagram of a multiplex communication system according to an embodiment. 1 is a block configuration diagram of a multiplex communication system according to an embodiment. It is the schematic which showed one example of the structure of the multiplexed signal output from a multiplexer. It is a block block diagram of the decoder and regenerator which concern on one Embodiment. It is a block block diagram of the decoder which concerns on 1 embodiment. It is a block diagram showing an example of a clock data regenerator. It is the block block diagram which showed one example of the delay device. It is a block block diagram of the surface acoustic wave delay line in the delay device shown in FIG. It is the block block diagram which showed an example of the correlator. It is a block block diagram of the surface acoustic wave matched filter in the correlator shown in FIG.

Explanation of symbols

2: Multiplex communication system 3: Multiplex communication system 4: Multiplex communication system 5: Multiplex communication system 6: Multiplex communication system 10: Communication network 11: Transmitter 12: Receiver 13: Communication network 20: Discriminators 21-1 to 21 -N: Buffer 22: Encoder 22-1 to 22-N: Encoder 23: Multiplexer 25: Setting device 26: Buffer amount measuring device 27: Transmitter 27-1 to 27-M: Transmitter 28: Code Multiplexer 30: optical transmission line 31: transmission line 32: wireless signal 32-1 to 32-N: wireless signal 33: optical splitter 34: wireless signal 40: receiver 41: distributor 42: from decoder 42-1. 42-N: decoder 43: regenerator 44: weight / code determiner 45: data processing unit 46: distribution decoding unit 53: notification signal generator 56: receivers 56-1 to 56-M: receiver 63: error Measuring devices 63-1 to 63-N: Error rate measuring device 66: Transmitter 70: Transmitting devices 70-1 to 70-M: Transmitting device 80: Receiving device 82: Distribution decoding units 82-1 to 82-M: Distribution decoding unit 83: PLL circuit 84: clock detection circuit 85: signal switching circuit 86: latch circuit 87: modulation circuit 88: surface acoustic wave delay line 89: rectification circuit 90: encoding multiplexing unit 93: correlation signal 94: first 2 reference signal 95: first reference signal 96: delay signal 97: low-pass filter 98: demodulation circuit 99: piezoelectric substrate 100: surface acoustic wave 101: transmission electrode 102: reception electrode 111: inverting circuit 112: level shift circuit 113: Modulation circuit 114: Modulation circuit 115: Surface acoustic wave matched filter 116: Surface acoustic wave matched filter 117: Surface acoustic wave matched filter 118: Surface acoustic wave map Filter 119: rectifier circuit 120: low-pass filter 121: rectifier circuit 122: low-pass filter 123: inverting circuit 124: demodulator circuit 131: transmission electrode 132: surface acoustic wave 133: reception electrode 134: transmission electrode 135: surface acoustic wave 136: Reception electrode 137: Reception electrode 140: Piezoelectric substrate 421: Correlator 422: Clock data regenerator 423: Delay device 424: Multiplier 425: Signal selector 426: Clock signal selector 431: Delay device 432: Multiplier 433: Signal selector 434: data regenerator 500: correlator 502: delay unit 503: clock data regenerator

Claims (18)

N (where N is an integer equal to or greater than 2), a transmitter that transmits a multiplexed signal obtained by multiplexing signals of channels, and the multiplexing transmitted from the transmitter that is oppositely connected to the transmitter A multiplex communication system having a receiving device for receiving a signal,
The transmitter is
Wherein p (Here, p is following the natural number N.) Of the N-channel signal pieces of direct sequence encoding system signals of the channel is provided for each signal of the channel by the spreading code of a predetermined code length P number of encoders for encoding and outputting,
A bit string of (Np) channel signals excluding the p channel signals of the N channel signals and a bit string of p encoded signals output from the p encoders. A multiplexer for generating and outputting the multiplexed signal, each given a predetermined weight;
A transmitter for transmitting the multiplexed signal output from the multiplexer by a predetermined communication method,
The receiving device is:
A receiver that receives the multiplexed signal transmitted from the transmitter, and automatically gain-amplifies and outputs as an electrical signal;
A distributor for distributing and outputting the multiplexed signal output from the receiver in N;
P decoding units provided for each of the p multiplexed signals out of the N multiplexed signals output from the distributor and decoding the p channel signals corresponding to the encoding schemes, respectively. And
The multiplexed signal provided for each (Np) multiplexed signals excluding the p multiplexed signals out of the N multiplexed signals from the distributor is multiplexed by the transmitter. A regenerator for identifying and reproducing,
Each of the regenerators acquires the multiplexed signal and the first reference signal from the distributor, and multiplexes the multiplexed signal to one of the clock signal and the first reference signal reproduced from the multiplexed signal. A first data regenerator for synchronizing and regenerating the multiplexed signal by synchronizing signals;
Each of the decoders acquires a correlation signal that correlates the multiplexed signal from the distributor and the spreading code, and a correlation signal that is correlated by the correlator, and reproduces it from the correlation signal. A second data regenerator that identifies and reproduces one of the N channel signals by synchronizing the correlation signal with a clock signal;
Of the p second data regenerators, q (where q is a natural number equal to or less than p), the second data regenerators are synchronized with the clock signal regenerated from the correlation signal together with the identification replay. Output clock signal,
Multiplex communication system that is characterized in that said clock signal output of the first reference signal from one of the second data regenerator in said first data reproduction device. N (where N is an integer equal to or greater than 2), a transmitter that transmits a multiplexed signal obtained by multiplexing signals of channels, and the multiplexing transmitted from the transmitter that is oppositely connected to the transmitter A multiplex communication system having a receiving device for receiving a signal,
The transmitter is
A direct spreading coding method using a spreading code of a predetermined code length provided for each of p (where p is a natural number equal to or less than N) channels of the N channels of signals. P number of encoders for encoding and outputting,
A bit string of (Np) channel signals excluding the p channel signals of the N channel signals and a bit string of p encoded signals output from the p encoders. A multiplexer for generating and outputting the multiplexed signal, each given a predetermined weight;
A transmitter for transmitting the multiplexed signal output from the multiplexer by a predetermined communication method,
The receiving device is:
A receiver that receives the multiplexed signal transmitted from the transmitter, and automatically gain-amplifies and outputs as an electrical signal;
A distributor for distributing and outputting the multiplexed signal output from the receiver in N;
P decoding units provided for each of the p multiplexed signals out of the N multiplexed signals output from the distributor and decoding the p channel signals corresponding to the encoding schemes, respectively. And
The multiplexed signal provided for each (Np) multiplexed signals excluding the p multiplexed signals out of the N multiplexed signals from the distributor is multiplexed by the transmitter. A regenerator for identifying and reproducing,
Each of the decoders obtains a correlator for correlating the multiplexed signal from the distributor with the spreading code, a correlation signal correlated with the correlator, and a second reference signal, Secondly, the correlation signal is synchronized with any one of the clock signal reproduced from the correlation signal and the second reference signal to identify and reproduce the signal of any one of the N channel signals. A data regenerator,
Of the p second data regenerators, q (where q is a natural number equal to or less than p), the second data regenerators, and the clock signal regenerated from the correlation signal together with the identification replay and the first 2 Output a clock signal synchronized with either one of the reference signals,
Multiplex communication system that is characterized in that said clock signal output of the second reference signal from the other of said second data regenerator in the second data regenerator. The transmission apparatus further includes a setting unit configured to set the magnitude of the weight for the N channel signals and the spreading code or the code length of the spreading code for the p channel signals. The multiplex communication system according to claim 1 or 2 . The receiving apparatus receives from the transmitting apparatus the magnitude of the weight for the N channel signals transmitted by the transmitting apparatus and the spreading code or the code length of the spreading code for the p channel signals. Further comprising a notifier for determining based on the multiplexed signal and notifying the transmitter
In the transmission device, the setting device includes:
The size of the weight, the spreading code, or the code length of the spreading code is set according to the size of the weight notified from the notifier, the code length of the spreading code or the spreading code. 4. The multiplex communication system according to 3 . The receiving apparatus further includes p error rate measuring units for measuring a bit error rate of the p channel signals for each channel from the p channel signals decoded by the decoder,
The notifier sets the weight size, the spreading code, or the code length of the spreading code so that the p bit error rate measured by the p error rate measuring devices is equal to or less than an allowable bit error rate. The multiplex communication system according to claim 4 , wherein the multiplex communication system is determined. In the transmission apparatus, the weight of one channel signal with p = 1 among the two channel signals with N = 2 is W1 (W1 is a natural number), and the other one. The weight for the signal of the number of channels is W2 (W2 is 1), and the allowable bit error rate for the signal of the one channel where p is 1 is e (e is an arbitrary value) ))
In the receiving device, the notifier is
The bit error rate for one channel signal measured by the error rate measuring device and having the p of 1 is represented by em, and when em is less than e, the code length of the spreading code is L1 (where L1 is a natural number) to. decided in), em is the code length of the spreading code when the above e L2 (although, L2 to claim 5, characterized in that determining to.) with and L1 <L2 is a natural number The multiplex communication system described. The transmitter is
In front of the p encoders, the p buffers for storing the signals of the p channels for each channel in advance, and in the previous stage of the multiplexer, the signals of the (Np) channels are channeled in advance. (Np) buffers to be stored every time, a buffer amount measuring device for measuring the amount of channel signals stored in the N buffers for each buffer, and a buffer measured by the buffer amount measuring device A notification signal generator that generates a notification signal to notify the amount and outputs the notification signal as a signal of any one of the p channel signals;
In the receiving device, the notifier is
The size of the weight, the spreading code, or the code length of the spreading code is determined based on the notification signal output from the notification signal generator and the bit error rate measured by the error rate measuring device. The multiplex communication system according to claim 5 . The transmitter is
In front of the p encoders, the p buffers for storing the signals of the p channels for each channel in advance, and in the previous stage of the multiplexer, the signals of the (Np) channels are channeled in advance. (Np) buffers to be stored every time, and a buffer amount measuring device for measuring the amount of channel signals stored in the N buffers for each buffer,
The multiplex communication system of claim 3 wherein the setter, characterized in that for setting the weight to a predetermined value corresponding to the buffer amount measured by the buffer amount measuring device. In the transmission apparatus, when the N is 2,
In the transmission device, the setting device includes:
When the buffer amount of the signal of one channel with p set to 1 measured by the buffer amount measuring device is 0, the weight for the signal of one channel with p set to 1 is set to 0 and the other one If the buffer amount of the signal of one channel with a weight of 1 for the channel of 1 channel and the p of 1 measured by the buffer amount measuring device is greater than 0, the channel of 1 channel with the p of 1 is measured. 9. The multiplex communication system according to claim 8 , wherein the weight for the signal is 1 and the weight for the signal of the other one channel is W (W is a natural number). The transmitter is
In front of the p encoders, the p buffers for storing the signals of the p channels for each channel in advance, and in the previous stage of the multiplexer, the signals of the (Np) channels are channeled in advance. (Np) buffers to be stored every time, and a buffer amount measuring device for measuring the amount of channel signals stored in the N buffers for each buffer;
The size of the weight for the N channel signals and the code length of the spreading code or the spreading code for the p channel signals are set for each channel according to the buffer amount measured by the buffer amount measuring device. It further includes a setting device for setting,
In the receiver, each of the (Np) regenerators delays the multiplexed signal in advance by a predetermined time according to the weight and the code length before the first data regenerator and outputs the delayed signal. The multiplex communication system according to claim 1 , further comprising a delay unit. In the transmission apparatus, the setting unit sets a weight for a signal of one channel with p = 1 as one of the signals of two channels with N = 2, and with respect to a signal of another channel When the weight is set to W (where W is a natural number) and the code length for the signal of one channel with p being 1 is set to L (where L is a natural number),
In the receiving apparatus, the delay unit sets the multiplexed signal for the predetermined time d (where d is a natural number multiple of L × (1 + W) / (bit rate of the signals of the two channels)). The multiplex communication system according to claim 10 , wherein the multiplex communication system is delayed.   N (where N is an integer equal to or greater than 2), a transmitter that transmits a multiplexed signal obtained by multiplexing signals of channels, and the multiplexing transmitted from the transmitter that is oppositely connected to the transmitter A receiving device for receiving a signal, the receiving device of a multiplex communication system comprising:
  The multiplexed signal is a signal of p channels (where p is a natural number equal to or less than N) of the N channel signals by a direct spreading coding method using a spreading code of a predetermined code length. And assigning predetermined weights to the bit strings of the (Np) channel signals and the bit strings of the p encoded signals excluding the p channel signals out of the N channel signals. Signal,
  The receiving device is:
  A receiver that receives the multiplexed signal transmitted from the transmitter, and automatically gain-amplifies and outputs as an electrical signal;
  A distributor for distributing and outputting the multiplexed signal output from the receiver in N;
  P decoding units provided for each of the p multiplexed signals out of the N multiplexed signals output from the distributor and decoding the p channel signals corresponding to the encoding schemes, respectively. And
  The multiplexed signal provided for each (Np) multiplexed signals excluding the p multiplexed signals out of the N multiplexed signals from the distributor is multiplexed by the transmitter. A regenerator for identifying and reproducing,
  Each of the regenerators acquires the multiplexed signal and the first reference signal from the distributor, and multiplexes the multiplexed signal to one of the clock signal and the first reference signal reproduced from the multiplexed signal. A first data regenerator for synchronizing and regenerating the multiplexed signal by synchronizing signals;
  Each of the decoders obtains a correlator that correlates the multiplexed signal from the distributor and the spreading code, and a correlation signal correlated by the correlator, and reproduces the correlation signal. A second data regenerator that identifies and reproduces one of the N channel signals by synchronizing the correlation signal with a clock signal;
  Of the p second data regenerators, q (where q is a natural number equal to or less than p), the second data regenerators are synchronized with the clock signal regenerated from the correlation signal together with the identification replay. Output clock signal,
  In the first data regenerator, the first reference signal is the clock signal output from any one of the second data regenerators.   N (where N is an integer equal to or greater than 2), a transmitter that transmits a multiplexed signal obtained by multiplexing signals of channels, and the multiplexing transmitted from the transmitter that is oppositely connected to the transmitter A receiving device for receiving a signal, the receiving device of a multiplex communication system comprising:
  The multiplexed signal is a signal of p channels (where p is a natural number equal to or less than N) of the N channel signals by a direct spreading coding method using a spreading code of a predetermined code length. And assigning predetermined weights to the bit strings of the (Np) channel signals and the bit strings of the p encoded signals excluding the p channel signals out of the N channel signals. Signal,
  The receiving device is:
  A receiver that receives the multiplexed signal transmitted from the transmitter, and automatically gain-amplifies and outputs as an electrical signal;
  A distributor for distributing and outputting the multiplexed signal output from the receiver in N;
  P decoding units provided for each of the p multiplexed signals out of the N multiplexed signals output from the distributor and decoding the p channel signals corresponding to the encoding schemes, respectively. And
  The multiplexed signal provided for each (Np) multiplexed signals excluding the p multiplexed signals among the N multiplexed signals from the distributor is multiplexed by the transmitter. A regenerator for identifying and reproducing,
  Each of the decoders obtains a correlator for correlating the multiplexed signal from the distributor with the spreading code, a correlation signal correlated with the correlator, and a second reference signal, Secondly, the correlation signal is synchronized with any one of the clock signal reproduced from the correlation signal and the second reference signal to identify and reproduce the signal of any one of the N channel signals. A data regenerator,
  Of the p second data regenerators, q (where q is a natural number equal to or less than p), the second data regenerators, and the clock signal regenerated from the correlation signal together with the identification replay and the first 2 Output a clock signal that is synchronized with one of the reference signals,
  In the second data regenerator, the second reference signal is the clock signal output from the other second data regenerator. The transmitting apparatus transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2), and a receiving apparatus that is oppositely connected to the transmitting apparatus is transmitted from the transmitting apparatus. A multiplex communication method for receiving the multiplexed signal comprising:
The transmitter is
Of the N channel signals, p (where p is a natural number equal to or less than N) channel signals are encoded by a direct spreading coding method using a spreading code of a predetermined code length , and the coded code The multiplexed signal is generated by assigning predetermined weights to the bit strings of the (Np) channel signals excluding the p channel signals among the N signal and the N channel signals. And send it with a predetermined communication method,
The receiving device is:
The multiplexed signal transmitted from the transmitting device is received and output as an electric signal, automatically gain amplified and distributed to N signals, and p multiplexed signals among the distributed N multiplexed signals are obtained. The (Np) multiplexed signals excluding the p multiplexed signals out of the N multiplexed signals that have been decoded and distributed for each channel corresponding to the coding scheme are respectively the multiplexed signals. The (Np) multiplexed signals are further identified and reproduced in synchronization with either the clock signal reproduced from the first reference signal or the first reference signal,
When the p multiplexed signals are decoded, the multiplexed signal and the spreading code are correlated, and the correlated correlation signal is synchronized with the clock signal reproduced from the correlated signal. Identify and replay the channel signal,
The clock reproduced from the correlation signal together with identification reproduction when identifying and reproducing q signals of the channel for q (where q is a natural number equal to or less than p) out of the p multiplexed signals. Generate q clock signals synchronized with the signal,
The multiplex communication method, wherein when identifying the (Np) multiplexed signals, the first reference signal is any one of the q clock signals. The transmitting apparatus transmits a multiplexed signal obtained by multiplexing signals of N channels (where N is an integer equal to or greater than 2), and a receiving apparatus that is oppositely connected to the transmitting apparatus is transmitted from the transmitting apparatus. A multiplex communication method for receiving the multiplexed signal comprising:
The transmitter is
Of the N channel signals, p (where p is a natural number equal to or less than N) channel signals are encoded by a direct spreading coding method using a spreading code of a predetermined code length , and the coded code The multiplexed signal is generated by assigning predetermined weights to the bit strings of the (Np) channel signals excluding the p channel signals among the N signal and the N channel signals. And send it with a predetermined communication method,
The receiving device is:
The multiplexed signal transmitted from the transmitting device is received and output as an electric signal, automatically gain amplified and distributed to N signals, and p multiplexed signals among the distributed N multiplexed signals are obtained. (Np) multiplexed signals excluding the p multiplexed signals out of the N multiplexed signals that have been decoded and distributed for each channel corresponding to the encoding scheme, and are respectively reproduced.
When decoding the p multiplexed signals, a correlation between the multiplexed signal and the spreading code is obtained, and a correlation signal obtained by taking the correlation is reproduced from the correlation signal, and any of the second reference signal and the clock signal The signal of the p number of channels is identified and reproduced in synchronization with either one of the above,
The clock reproduced from the correlation signal together with identification reproduction when identifying and reproducing q signals of the channel for q (where q is a natural number equal to or less than p) out of the p multiplexed signals. Generating q clock signals synchronized with one of the signal and the second reference signal;
The second reference signal is used as one of the q clock signals synchronized with the other second reference signals when identifying and reproducing the signals of the p channels. Multiple communication method. The receiving apparatus measures a bit error rate for each channel from the decoded signals of the p channels, and the N number of bits so that the measured p number of bit error rates is less than or equal to an allowable bit error rate. Determining the magnitude of the weight for the channel signal and the code length of the spreading code or the spreading code for the p channel signals, and notifying the transmitting apparatus;
The transmitting device sets the weight size, the spreading code, or the code length of the spreading code according to the weight size, the spreading code or the code length of the spreading code notified from the receiving device. The multiplex communication method according to claim 14 or 15 , characterized in that The transmitter stores the p channel signals in a buffer in advance for each channel before encoding the p channel signals and before multiplexing the N channel signals ( N-p) channel signals are stored in a buffer for each channel in advance, the stored N-channel signal amounts are measured for each buffer, and a notification signal for notifying the measured buffer amount is generated. Transmitting as a signal of any one of the signals of the p channels,
The receiving apparatus determines the magnitude of the weight, the spreading code, or the code length of the spreading code based on the notification signal transmitted from the transmitting apparatus and the measured p bit error rates. The multiplex communication method according to claim 16 . The transmitter stores the p channel signals in a buffer in advance for each channel before encoding the p channel signals and before multiplexing the N channel signals ( N-p) channel signals are stored in a buffer for each channel in advance, the stored amount of the N-channel signals is measured for each buffer, and a predetermined value corresponding to the measured buffer amount is obtained. The weight Wi for the N channel signals and the code length Lj of the spreading code for the p channel signals (where i is N or less and corresponds to each channel of the N channel signals, j Is equal to or less than p and corresponds to each channel of the p-channel signals).
The receiving apparatus delays the multiplexed signal for a predetermined time in advance before reproducing the (Np) multiplexed signals,
When delaying the multiplexed signal, the receiving apparatus delays by the predetermined time di (where i = j and di is a natural number multiple of Lj × (1 + Wi) for each channel). The multiplex communication method according to claim 14 .

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