JP2004356940A - Communication apparatus and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication apparatus which reduces the processing load of a signal processor and easily copes with a request such as increase of carrier signals, etc. <P>SOLUTION: The communication apparatus for transmitting a plurality of target signals using n carrier signals comprises a controller 5 which detects information concerning the transmission quality about each carrier signal for a plurality of signal processors 4 provided for the carrier signals one to one, and allots the target signals to be processed to the signal processes 4 one to one based on the detected information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a communication device that transmits a transmission target signal using a plurality of carrier signals.
[0002]
[Prior art]
With the widespread use of the Internet connection environment, there is an increasing demand to access a server or the like on the Internet by wireless communication even when away from home. Against this background, various wireless communication schemes have been studied and developed.
[0003]
One of such wireless communication systems is, for example, a so-called time-division multi-carrier transmission system. In this system, a frame signal as shown in FIG. 3 is transmitted and received using each of the n plurality of carrier signals having different frequencies f1 to fn.
[0004]
As shown in FIG. 3, the frame of this system is divided into four substantially equal time regions (slots), and the first slot is further divided into three substantially equal time regions (subslots). Each of the sub-slots of the first slot includes three uplink (communication from the mobile communication body to the base station) signals R1, R2, and R3, respectively, and the remaining sub-slots of the second to fourth slots are included. Each includes three downlink (communication from the base station to the mobile communication body) signals T1, T2, and T3.
[0005]
Therefore, in this time division multi-carrier system, the signal carried by each carrier signal is a time division system signal for three channels, and the downlink data communication capacity is larger than the uplink data communication capacity. This is a so-called asymmetric communication. The number of channels that can be accommodated as a whole is obtained by multiplying the number of channels carried in a time-division manner by each carrier signal by the number of carrier signals. In this example, signals of 3n channels are transmitted and received. it can.
[0006]
Further, in the time-division multi-carrier system, a reference signal is inserted into each of the time-divided data in each time slot, and transmission / reception using a plurality of antennas can be realized as follows. FIG. 4 is a configuration block diagram illustrating an example of a time-division multi-carrier communication device when a plurality of antennas are used.
[0007]
The communication device shown in FIG. 4 includes a plurality of antennas 1, a radio unit 2 provided corresponding to antennas 1, a path control unit 3, a signal processing unit 4, and a control unit 5. The radio unit 2 includes a radio signal processing unit (RF) 21, a down converter (DDC) 22, and an up converter (DUC) 23.
[0008]
Here, the radio signal processing unit 21 receives a signal arriving at the corresponding antenna 1 and outputs the signal to the down converter 22. Further, the wireless signal processing unit 21 supplies a signal input from the up-converter 23 to the antenna 1 and causes the signal to be transmitted.
[0009]
The path control unit 3 receives the input of the weight information set including the weight information corresponding to each wireless unit 2 from the signal processing unit 4 and converts the signal output from each wireless unit 2 into the corresponding weight information. The signal is multiplied by a weight based on the combined signal, and is output to the signal processing unit 4 as a received signal. The path control unit 3 outputs a signal to be transmitted, which is input from the signal processing unit 4, to each wireless unit 2.
[0010]
The signal processing unit 4 calculates a correlation between the received signal input from the path control unit 3 and the reference signal, and outputs weight information based on a result of the correlation calculation to the path control unit 3. This process is similar to a process generally known as a process of controlling an adaptive array antenna (for example, Patent Document 1).
[0011]
The signal processing unit 4 generates a signal carried by each carrier signal, extracts a plurality of data to be transmitted from the received signal carried by each carrier signal, and sends the data to the control unit 5. Output. Specifically, in this communication device, in order to mitigate the effects of selective fading, the same transmission target data is transmitted using a plurality of channels so as to be conveyed using two or more carrier signals having different frequencies. To transmit the data.
[0012]
Further, the signal processing unit 4 detects the state of the wireless transmission path with reference to the strength of the signal carried by each carrier signal, and adaptively changes the modulation method of the signal based on the detection result. ing. The process of detecting the state of the wireless transmission path will be described later.
[0013]
The control unit 5 is, for example, a CPU and outputs data to be transmitted to the signal processing unit 4. The control unit 5 outputs data to be transmitted, which is input from the signal processing unit 4, to an external device.
[0014]
The communication device shown in FIG. 4 operates, for example, as a base station, extracts respective data from signals received from a plurality of mobile communicators via the antenna 1, and outputs the respective data via the control unit 5. Transmit to the destination. In addition, data received from a plurality of servers on the Internet is transmitted to a mobile communication body to which each data is distributed.
[0015]
Here, the content of the process of detecting the state of the wireless transmission path performed by the signal processing unit 4 will be described. The signal processing unit 4 is, for example, a DSP (Digital Signal Processor), and operates according to a designated program. A DSP program for implementing the signal processing unit 4 of the communication device in FIG. 4 is as shown in FIG.
[0016]
That is, as shown functionally in FIG. 5, the program includes a feedback gain control unit 41, a frequency offset estimating unit 42, a timing offset estimating unit 43, a received signal compensating unit 44, a transmission parameter setting unit 45, a transmission signal generator 46, a decoder 47, and an encoder 48, and operate as follows. The strength of the received signal is detected by feedback gain control section 41. The frequency offset estimating unit 42 estimates the amount of offset between the frequency of the original carrier signal and the frequency of the received signal (offset generated due to the influence of transmission path conditions, etc.) and outputs the estimated frequency offset. Further, the timing offset estimating unit 43 estimates the amount of the original timing offset of the received signal (the offset generated due to the influence of the transmission path condition, etc.) and outputs the estimated timing offset amount.
[0017]
The received signal compensating unit 44 compensates the received signal using the received signal strength information, the frequency offset estimation amount, and the timing offset estimation amount, and outputs the result to the decoding unit 47. The decoding unit 47 decodes each data based on the compensated received signal, and outputs the decoding result to the control unit 5.
[0018]
The transmission parameter setting unit 45 determines parameters for signal transmission using the received signal strength information, the frequency offset estimation amount, and the timing offset estimation amount. The transmission signal generation unit 46 generates and outputs a transmission signal carried by each carrier signal based on the encoded data input from the encoding unit 48. The encoding unit 48 encodes the data input from the control unit 5 and outputs the encoded data. Since the data exchanged with the control unit 5 is logical data, it may further include a program module for converting between the physical data used inside the signal processing unit 4.
[0019]
[Patent Document 1]
JP 2001-53661 A
[0020]
[Problems to be solved by the invention]
As described above, in the above-described conventional communication apparatus, the processing of data carried by each of a plurality of carrier signals is performed by starting the processing of controlling the adaptive array antenna by one signal processing unit. For this reason, there is a problem that it is difficult to respond to a request such as the addition of a carrier signal due to a high processing load of the signal processing unit.
[0021]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication device which can reduce the processing load on a signal processing unit and can easily respond to a request for adding a carrier signal. One.
[0022]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems of the conventional example is a communication device that transmits a plurality of transmission target signals using n carrier signals, and corresponds to each of the n carrier signals. N signal processing means provided; detection means for detecting information about the transmission quality of each of the n carrier signals; and n signal processing based on the information detected by the detection means. Allocating means for allocating a transmission target signal to be processed to each of the means, wherein each of the n signal processing means which has been allocated the transmission target signal is allocated by the allocating means. It is characterized in that a transmission signal using a corresponding carrier signal is output based on the obtained transmission target signal.
[0023]
As described above, the signal processing means is provided corresponding to the carrier signal, and which signal processing means processes each of the transmission target signals is adaptively assigned based on the information on the transmission quality. Since it can be reduced and is provided corresponding to the carrier signal, it is possible to easily respond to the addition of the carrier signal.
[0024]
The present invention for solving the problem of the above-mentioned conventional example is a communication apparatus for transmitting a plurality of transmission target signals using n carrier signals, wherein the n signal processing means, Detecting means for detecting information about the transmission quality of each of the plurality of carrier signals, and assigning different carrier signals to each of the n signal processing means based on the information detected by the detecting means. A first allocating means, and a second allocating means for allocating a transmission target signal to be processed to each of the n signal processing means based on the signal detected by the detecting means; Among the processing means, each of the signal processing means to which the signal to be transmitted has been allocated by the second allocating means, based on the signal to be transmitted allocated by the second allocating means, It is characterized by outputting a transmission signal using a carrier signal allocated by the first allocation means.
[0025]
Here, the detection means may detect information on transmission quality of each carrier signal based on at least one of a time compensation amount and a frequency compensation amount for a signal transmitted using each carrier signal.
[0026]
Further, a communication method according to an aspect of the present invention is a communication method for transmitting a plurality of transmission target signals using n carrier signals, and is provided corresponding to each of the n carrier signals. a detection step of detecting information on transmission quality of each of the n carrier signals using n signal processing means, and performing the n signal processing based on the information detected in the detection step. To each of the means, a transmission target signal to be processed is assigned, and among the n signal processing means, to each of the signal processing means to which the transmission target signal is assigned, based on the assigned transmission target signal, A transmission signal using a corresponding carrier signal is output.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. A communication device according to an embodiment of the present invention performs communication by a time-division multi-carrier transmission scheme. Specifically, as shown in FIG. 1, a plurality of antennas 1 and a plurality of , 4n, and the same number of signal processing units 4a, 4b,..., 4n as the number of carriers, and connected to the plurality of signal processing units 4 via a bus BUS. And a control unit 5. Here, the antenna 1 and the radio unit 2 are the same as those of the related art, and thus detailed description is omitted.
[0028]
The path control unit 3 'receives and holds weight information sets Wa, Wb,... Wn including weight information corresponding to each wireless unit 2 from each of the signal processing units 4a, 4b,. I do. Then, weight information corresponding to each of the wireless units 2 is extracted from the i-th weight information set Wi, and a signal output from each of the wireless units 2 is multiplied by a weight based on the extracted weight information to be synthesized, The signal is output as a reception signal to the signal processing unit 4i corresponding to the i-th weight information set. The path control unit 3 ′ outputs a signal to be transmitted, which is input from each of the signal processing units 4, to each wireless unit 2.
[0029]
Each of the signal processing units 4 calculates a correlation between the received signal input from the path control unit 3 'and the reference signal, and outputs a set of weight information based on the result of the correlation calculation to the path control unit 3'. . This process is similar to a process generally known as a process of controlling an adaptive array antenna.
[0030]
In addition, these signal control units 4 receive in advance the assignment of which carrier signal among a plurality of carriers to process, generate a signal carried by the assigned carrier signal, and A plurality of data to be transmitted is extracted from the received signal carried by the transmitted carrier signal.
[0031]
Further, each of these signal processing units 4 detects the state of the wireless transmission path with reference to the strength of the signal carried by each carrier signal, and adapts the signal modulation method based on the detection result. Has been changed. The details of the processing of the signal processing unit 4, such as the processing of detecting the state of the wireless transmission path, will be described later.
[0032]
The control unit 5 is, for example, a CPU, receives a plurality of data to be transmitted from an external device, determines which carrier signal each of the data is to be transmitted, and based on the determination, Each data is output to at least one of the signal processing units 4. Here, in order to mitigate the effect of the selective fading, control may be performed so that one transmission target data is carried using two or more carrier signals having different frequencies. Therefore, each data may be output to a plurality of signal processing units 4. Here, the process (first allocation process) in which the control unit 5 determines which carrier signal each data is transmitted to will be described in detail later.
[0033]
Further, the control unit 5 receives the input of the transmission target data received from the signal processing unit 4 and outputs the data to an external device.
[0034]
The communication device shown in FIG. 1 operates, for example, as a base station, extracts respective data from signals received from a plurality of mobile communicators via an antenna 1, and outputs the respective data via a control unit 5. Transmit to the destination. In addition, a process of transmitting data received from a plurality of servers on the Internet to a mobile communication body to which each data is distributed is performed.
[0035]
Here, more detailed contents of each processing of the signal processing unit 4 will be described. The signal processing unit 4 is, for example, a DSP (Digital Signal Processor) and operates according to a designated program. The DSP program for realizing the signal processing unit 4 of the communication device of FIG. 1 is functionally similar to that shown in FIG. 5, but the conventional signal processing unit 4 includes a plurality of carriers. In contrast to the signal processing, the signal processing unit 4 of the present embodiment is different in that it processes one assigned carrier signal.
[0036]
That is, as shown in FIG. 5, the program includes a feedback gain control unit 41, a frequency offset estimating unit 42, a timing offset estimating unit 43, a received signal compensating unit 44, and a transmission parameter setting unit 45. , A transmission signal generation unit 46, a decoding unit 47, and an encoding unit 48, and operate as follows. First, the strength of the received signal is detected by the feedback gain control unit 41. The frequency offset estimating unit 42 estimates the amount of offset between the original frequency of the allocated carrier signal and the frequency of the received signal (offset generated due to the influence of transmission path conditions, etc.), and calculates the frequency offset estimation amount. Output. Further, the timing offset estimating unit 43 estimates the amount of the original timing offset of the received signal (the offset generated due to the influence of the transmission path condition, etc.) and outputs the estimated timing offset amount.
[0037]
The received signal compensator 44 compensates the received signal using the received signal strength information, the frequency offset estimation amount, and the timing offset estimation amount, and outputs the result to the decoding unit 47. The decoding unit 47 decodes each data based on the compensated received signal, and outputs the decoding result to the control unit 5 via the bus.
[0038]
The transmission parameter setting unit 45 determines parameters for signal transmission using the received signal strength information, the frequency offset estimation amount, and the timing offset estimation amount. The transmission signal generator 46 generates and outputs a transmission signal carried by the assigned carrier signal based on the encoded data input from the encoder 48. The encoding unit 48 encodes data input from the control unit 5 via the bus and outputs the encoded data.
[0039]
Since data transmitted to and received from the control unit 5 via the bus is logical data, the data unit may further include a program module for converting data with physical data used in the signal processing unit 4.
[0040]
[First assignment process]
Next, a first assignment process of the control unit 5 will be described. In the present embodiment, the control unit 5 obtains a frequency offset estimation amount (ie, frequency compensation amount) or a timing offset estimation amount (at least one of the frequency offset estimation unit 42 and the timing offset estimation unit 43 of the signal processing unit 4). That is, at least one input of the amount of time compensation) is received as transmission quality information, and data to be processed by each signal processing unit 4 is assigned based on the transmission quality information.
[0041]
Specifically, the control unit 5 initially assigns each of the signals to be transmitted to a certain signal processing unit 4 by a predetermined method (for example, randomly), and the signal processing unit 4 The signal processing related to the data is performed using the allocated carrier signal. In the present embodiment, the time-division multi-carrier system is adopted, so that, for example, as shown in FIG. 3, up to three data can be transmitted via each carrier signal. Therefore, a maximum of three data are assigned to each signal processing unit 4.
[0042]
The signal processing unit 4 extracts each data carried by the carrier signal from a received signal received via the assigned carrier signal, and estimates a frequency offset or a timing offset related to the carrier signal. At least one of the quantities is output as transmission quality information. The control unit 5 causes each of the signal processing units 4 to output the assigned data and perform processing for transmission, determine the transmission quality of each carrier signal based on the transmission quality information, and In each frame, allocation of each data to each signal processing unit 4 is determined.
[0043]
For example, when the transmission quality information related to the i-th carrier signal fi has a value indicating that the transmission quality has degraded below a predetermined threshold, the signal processing unit 4 corresponding to the carrier signal fi is currently The allocated data is set as a target of the first allocation process. Then, whether or not there is an empty channel is checked in the order of the carrier signals having good transmission quality information to be output, and when an empty channel is found, the first allocation is performed using the found empty channel. Control to transmit the data that has been processed. That is, the data that has been subjected to the first allocation processing is allocated to the signal processing unit 4 allocated to the carrier signal associated with the found free channel.
[0044]
Here, even though the transmission quality information is obtained from the received signal, which is the first part of the frame, even if the transmission quality of the carrier signal carrying that frame is degraded, data is allocated to the next frame. The reason why is not changed is that, since the allocation is determined on a frame basis, if the channel allocation is changed in the frame, the data transmission destination terminal cannot receive the data.
[0045]
[Second allocation process]
Further, when the transmission quality of a certain carrier signal is degraded and all three channels related to the carrier signal having relatively good transmission quality are vacant, the carrier signal is exchanged to thereby exchange each data. If the carrier signal assigned to the signal processing unit 4 is changed without changing the assignment to the signal processing unit 4, the processing load is easy. Therefore, in the present embodiment, the control unit 5 may further execute a process of allocating a carrier signal to the signal processing unit 4 (second allocation process) based on the transmission quality information.
[0046]
According to this, for example, the information on the transmission quality related to the i-th carrier signal fi assigned to the signal processing unit 4i has a value indicating that the transmission quality has deteriorated below a predetermined threshold, and This is a case where the transmission quality information related to the j-th carrier signal fj assigned to the signal processing unit 4j indicates that the transmission quality is relatively good, and the data assigned to the signal processing unit 4j is If there is no channel, that is, if each channel of the carrier signal fj is an empty channel, the control unit 5 assigns the j-th carrier signal fj to the signal processing unit 4i and assigns another carrier to the signal processing unit 4j. A signal (for example, the i-th carrier signal fi) is allocated. As a result, each data can be transmitted using the carrier signal fj having relatively good transmission quality without changing the data allocation.
[0047]
As described above, the signal processing unit 4 such as a DSP is provided corresponding to the carrier signal, and the carrier signal and the transmission target data are allocated to each signal processing unit 4 by the first and second allocation processes. The processing load on the processing unit can be reduced, and a request for the addition of a carrier signal or the like can be easily met by adding the signal processing unit 4 or the like.
[0048]
[Loopback inspection]
Further, in the present embodiment, the phase variation and the amplitude variation are different for each antenna 1 due to variations in delay characteristics and amplitude characteristics of circuit elements such as amplifiers and filters included in each radio unit 2, In some cases, transmission and reception may be affected by phase variations unique to each transmission. For this reason, the antenna phase necessary for transmitting the downlink signal (the transmission signal here) is determined from the uplink information (the reception signal here). Is significantly different, there may be cases where the expected improvement in characteristics is not obtained in the downlink.
[0049]
Therefore, as in the prior art, in the present embodiment as well, the signals transmitted from each antenna 1 are combined by a combiner, and the downstream phase difference of each antenna 1 is calculated by a DSP or the like. It is conceivable to use a terminal device that transmits the signal of (i) and receives it by each antenna 1 and calculates the uplink phase difference of each antenna 1 in the signal processing unit 4.
[0050]
The information of the downlink phase difference obtained using this terminal device is fed back to the signal processing unit 4, and the signal processing unit 4 corrects the phase based on the uplink phase difference and the downlink phase difference, thereby obtaining the reception signal. It is also possible to achieve an improvement in characteristics by using the weight information obtained from the above as it is for transmission. Note that this correction is performed using a signal including a predetermined sine wave or a known reference signal. When a sine wave is used, an up phase difference due to the sine wave can be calculated by performing a discrete Fourier transform (DFT) at the frequency of the sine wave.
[0051]
However, in the present embodiment, since a plurality of signal processing units 4 are provided, the signal processing units 4 are used to provide a signal between the antenna 1 shown in FIG. 1 and the radio unit 2 provided corresponding thereto. A changeover switch may be provided so that the pair of wireless units 2 can be connected to perform a loopback test. As shown in FIG. 2, the communication device in this case includes a plurality of antennas 1, a radio unit 2 provided corresponding to the antenna 1, a path control unit 3 ', and a signal processing unit of the same number as the number of carriers. , 4n, a control unit 5 connected to the plurality of signal processing units 4 via a bus BUS, and a changeover switch 6 provided corresponding to each wireless unit 2. Be composed.
[0052]
The changeover switch 6 switches between a first mode for connecting the radio unit 2 and the antenna 1 and a second mode for connecting the pair of radio units 2. Specifically, the contact points Q of the changeover switches 6 shown in FIG. 2 may be connected to a common signal line.
[0053]
The control unit 5 sets any one of the signal processing units 4 as an inspection standard as an inspection standard, and allocates any one of the wireless units 2 to the signal processing unit 4 serving as the inspection standard. The assigned wireless unit 2 is hereinafter referred to as an inspection reference wireless unit. In addition, the control unit 5 selects a signal processing unit 4 different from the signal processing unit 4 serving as the inspection reference, and uses the selected signal processing unit 4 as an inspection target signal processing unit 4. Is assigned to the radio unit 2 to be used. The wireless unit 2 to be inspected is hereinafter referred to as a wireless unit to be inspected.
[0054]
Next, the control unit 5 switches the changeover switch 6 provided corresponding to the inspection target wireless unit and the changeover switch 6 provided corresponding to the inspection reference wireless unit to the second mode, and The wireless unit 2 is connected to the wireless unit 2 serving as the inspection reference wireless unit. Then, the control unit 5 causes a loopback inspection to be performed between them. That is, a signal is transmitted from the inspection reference radio section to the inspection target radio section, and the uplink phase difference of the inspection target radio section is calculated by the signal processing section 4 for the inspection target. Also, a signal is transmitted from the test target radio unit to the test reference radio unit, and the signal processor 4 serving as the test reference calculates the downlink phase difference of the test target radio unit.
[0055]
In addition, the control unit 5 compares the signal processing unit 4 used as the inspection target and the signal processing unit 4 used as the inspection reference during the loopback inspection with respect to the case where the loopback inspection is not performed. It may be instructed to increase the processing accuracy (to make the signal resolution finer). In this way, by making the signal processing accuracy different between when the loopback test is performed and when the loopback test is not performed, the accuracy of the loopback test can be reduced while suppressing the processing load in normal transmission and reception. Can be enhanced.
[0056]
Further, using the information on the transfer characteristics such as the phase difference obtained in this way, the inverse function is calculated to obtain an inverse characteristic parameter. Based on the inverse characteristic parameter, a compensation parameter for data transmission or the like is calculated. decide. Thereby, communication quality can be improved.
[0057]
Further, in the description so far, the case where the inspection of the corresponding radio unit 2 is performed for each antenna 1 has been described. However, the control unit 5 further performs a test between the inspection target radio unit and the inspection reference radio unit. Signals related to a plurality of carrier signals may be transmitted and received, and transmission characteristics such as an uplink phase difference and a downlink phase difference may be calculated for each antenna 1 and each carrier signal.
[0058]
According to the loopback test shown here, unlike the conventional case where the output signals from the antennas 1 are combined, the transfer characteristic can be detected for each antenna 1 (and further for each carrier signal). Also, when a problem occurs, information contributing to the identification of the radio unit 2 or the like in which the problem has occurred can be provided.
[0059]
Note that the communication apparatus of the present embodiment is not limited to the time-division multi-carrier communication as described here, but may be applied to any communication system using a plurality of antennas and carrier signals. You can do it.
[0060]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the processing load of a signal processing part can be reduced and the request of expansion of a carrier signal etc. can be easily responded.
[Brief description of the drawings]
FIG. 1 is a configuration block diagram illustrating an example of a communication device according to an embodiment of the present invention.
FIG. 2 is a configuration block diagram illustrating another example of the communication device according to the embodiment of the present invention.
FIG. 3 is an explanatory diagram illustrating an example of a frame configuration in communication using a time-division multi-carrier scheme.
FIG. 4 is a configuration block diagram illustrating an example of a conventional communication device.
FIG. 5 is a functional block diagram illustrating an example of a program of a signal processing unit 4.
[Explanation of symbols]
1 antenna, 2 radio section, 3, 3 'path control section, 4 signal processing section, 5 control section, 6 changeover switch, 21 radio signal processing section, 22 down converter, 23 up converter, 41 feedback gain control section, 42 frequency offset estimating section, 43 timing offset estimating section, 44 received signal compensating section, 45 transmission parameter setting section, 46 transmission signal generating section, 47 decoding section, 48 encoding section.

Claims (4)

A communication device for transmitting a plurality of transmission target signals using n carrier signals,
N signal processing means provided corresponding to each of the n carrier signals;
Detecting means for detecting information on the transmission quality of each of the n carrier signals;
Allocating means for allocating a transmission target signal to be processed to each of the n signal processing means based on the information detected by the detecting means,
Each of the n signal processing units, to which the transmission target signal has been allocated, outputs a transmission signal using a corresponding carrier signal based on the transmission target signal allocated by the allocation unit. A communication device. A communication device for transmitting a plurality of transmission target signals using n carrier signals,
n signal processing means;
Detecting means for detecting information on the transmission quality of each of the n carrier signals;
First assigning means for assigning mutually different carrier signals to each of the n signal processing means based on the information detected by the detecting means;
A second assigning unit that assigns a transmission target signal to be processed to each of the n signal processing units based on the information detected by the detecting unit,
Each of the n signal processing means, to which the signal to be transmitted has been allocated by the second allocating means, is assigned to the first allocation based on the signal to be transmitted allocated by the second allocating means. A communication device for outputting a transmission signal using the carrier signal allocated by the means. The communication device according to claim 1 or 2,
A communication apparatus according to claim 1, wherein said detection means detects information on transmission quality of each carrier signal based on at least one of a time compensation amount and a frequency compensation amount for a signal transmitted using each carrier signal. A communication method for transmitting a plurality of transmission target signals using n carrier signals,
Using n signal processing means provided corresponding to each of the n carrier signals,
For each of the n carrier signals, a detecting step of detecting information on the transmission quality thereof;
A transmission target signal to be processed is allocated to each of the n signal processing units based on the information detected in the detection step, and the transmission target signal is allocated among the n signal processing units. Causing each of the signal processing means to output a transmission signal using a corresponding carrier signal based on the assigned transmission target signal.

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