JP3437513B2 - Multi-carrier communication device and multi-carrier communication method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station device such as a mobile phone and a mobile TV phone in a mobile communication system, a base station device for communicating with the mobile station device, a digital TV broadcast transmitter, or a radio. LAN (Local Are
The present invention relates to a multi-carrier communication device and a multi-carrier communication method suitable for use as a transmission / reception device of an a Network), and particularly to a multi-carrier communication device and a multi-carrier communication method capable of suppressing waveform distortion due to a transient response of a filter.

[0002]

2. Description of the Related Art Conventionally, as this type of multi-carrier communication apparatus and multi-carrier communication method, Japanese Patent Laid-Open No. 11-1
There is one described in Japanese Patent No. 03285.

FIG. 7 is a block diagram showing a configuration of a transmission system of a conventional multicarrier communication device.

In the conventional multicarrier communication apparatus 700 shown in FIG. 7, transmission line coding and multilevel QA are performed.
The transmission data modulated according to the M method or the like is IFFT.
The inverse discrete Fourier transform (hereinafter referred to as IFFT processing) is performed by the (inverse fast Fourier transform) unit 701 and is input to the guard section addition processing unit 702. The guard interval is for eliminating an adverse effect on the way of propagation to the receiver.

Of the input IFFT output data, the time waveform portion corresponding to the guard interval is input to the selector 707 in the subsequent stage. Further, after delaying all the IFFT output data by the delay unit 706 for the time Ts of the guard interval,
It is input to the selector 707.

The selector 707 forms a time waveform with a guard interval added by switching and outputting the guard interval waveform and the effective symbol that are sequentially input. This is performed by arranging the data 803 of the end section of the effective symbol section Ts as the guard section (G1GI) 802 at the beginning of the effective symbol section Ts, as shown in FIG.

In the ramp processing unit 703, the time waveform to which the guard interval GI is added is shaped by a window function or a shift register before and after the output of the selector 707 in order to reduce unnecessary radiation to the outside of the band, and D / A converter 7
04, and converted into an analog transmission signal here.

The D / A converted analog transmission waveform is L
A PF (Low Pass Filter) 705 suppresses an extra signal component outside the band, and the signal is transmitted after analog processing.

[0009] Such a multi-carrier communication device 700
Then, a certain lump (1 burst) of an information signal is transmitted by repeating the above steps continuously.

That is, as shown in FIG. 8, a preamble 801 for performing reception gain control, frequency synchronization, symbol timing synchronization and channel distortion estimation in a receiver,
One temporally continuous block composed of several guard intervals (GI) 802, 804 and effective symbol intervals 803, 805 is continuously formed by the D / A converter 704 and LP.
It is processed in F705.

[0011]

However, in the conventional apparatus, since the rising time and the falling time of the LPF 705 are finite, the signal waveforms at the beginning and the end of the one-burst multicarrier signal train are LPF7.
05, the leading waveform is affected by the rising response portion, and the trailing waveform is affected by the falling response portion, so that the leading and trailing waveforms are distorted, which deteriorates the transmission characteristics. There is.

The present invention has been made in view of the above point, and reduces the deterioration of the transmission characteristic due to the transmission waveform distortion caused by the transient response of the filter even when a filter having a large fluctuation in the transient response of rising / falling is applied. It is an object of the present invention to provide a multi-carrier communication device and a multi-carrier communication method capable of performing the same.

[0013]

A multicarrier communication apparatus of the present invention is provided with a transient response time of a filter used for filtering the multicarrier signal at the beginning and the end of one burst of the multicarrier signal subjected to inverse discrete Fourier transform. And guard section addition processing means for adding a signal having a time width corresponding to the above.

According to this structure, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having the steep cutoff characteristic is used, the transient response is hardly increased without increasing the circuit scale. It is possible to reduce the waveform distortion at the beginning / end of the one-burst multi-carrier signal due to and improve the transmission characteristics.

In the multicarrier communication device of the present invention having the above-mentioned configuration, the guard section addition processing means adds a signal having a time width corresponding to the transient response time of the filter,
At the beginning of the first effective symbol in the first effective symbol in one burst of the multi-carrier signal, a signal in the tail section corresponding to the rising transient response time of the filter or any time longer than this transient response time is added to the beginning of the first effective symbol. , The signal of the leading section corresponding to the falling transient response time of the filter or any time longer than this transient response time in the last effective symbol in the one-burst multicarrier signal is added to the end of the last effective symbol. Take the configuration to add.

According to this structure, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having the steep cutoff characteristic is used, the transient response is hardly increased and the circuit scale is hardly increased. It is possible to reduce the waveform distortion of the effective symbol at the beginning / end of the one-burst multi-carrier signal due to and improve the transmission characteristic.

In the multicarrier communication device of the present invention, in the above structure, the time corresponding to the transient response time of the filter used for filtering the multicarrier signal is added to the end of the inverse burst Fourier transformed one burst multicarrier signal. And a guard section addition processing means for adding a width signal.

According to this structure, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having a steep cutoff characteristic is used, the transient response is hardly increased without increasing the circuit scale. It is possible to reduce the waveform distortion at the end of the one-burst multi-carrier signal and improve the transmission characteristics.

In the multicarrier communication device of the present invention having the above-mentioned configuration, the guard interval adding processing means adds a signal having a time width corresponding to the transient response time of the filter,
At the last effective symbol in the one-burst multicarrier signal, the signal of the leading section corresponding to the falling transient response time of the filter or any time longer than this transient response time is added to the end of the last effective symbol. Take the composition.

According to this configuration, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, the transient response is hardly increased even when the filter means having the steep cutoff characteristic is used. It is possible to reduce the waveform distortion of the effective symbol at the end of the one-burst multicarrier signal and improve the transmission characteristics.

In the multicarrier communication device of the present invention, in the above structure, the time corresponding to the transient response time of the filter used for filtering the multicarrier signal is added to the beginning of one burst of the multicarrier signal subjected to the inverse discrete Fourier transform. And a guard section addition processing means for adding a width signal.

According to this configuration, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having a steep cutoff characteristic is used, the transient response is hardly increased and the circuit scale is hardly increased. It is possible to reduce the waveform distortion at the beginning of the one-burst multi-carrier signal due to and improve the transmission characteristics.

In the multi-carrier communication device of the present invention having the above-mentioned configuration, the guard interval addition processing means adds a signal having a time width corresponding to the transient response time of the filter,
A structure in which a signal in a trailing interval corresponding to a rising transient response time of the filter or an arbitrary time longer than or equal to the transient response time in the first effective symbol in the one-burst multicarrier signal is added to the head of the first effective symbol. Take.

According to this structure, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having a steep cutoff characteristic is used, the transient response is hardly increased with the circuit scale. It is possible to reduce the waveform distortion of the effective symbol at the beginning of the one-burst multi-carrier signal due to and improve the transmission characteristics.

A mobile station apparatus according to the present invention comprises a multicarrier communication apparatus having the same configuration as any one of the above.

According to this configuration, in the mobile station device,
It is possible to obtain the same effect as any of the above.

The base station apparatus of the present invention comprises a multicarrier communication apparatus having the same configuration as any of the above.

According to this configuration, in the base station device,
It is possible to obtain the same effect as any of the above.

The mobile communication system of the present invention has a configuration including the mobile station apparatus or base station apparatus having the above configuration.

According to this configuration, in the mobile communication system, it is possible to obtain the same effects as those of the mobile station apparatus or base station apparatus having the above configuration.

According to the multicarrier communication method of the present invention, the multicarrier signal is filtered at the beginning and the end, or at the beginning and the end of one burst of the multicarrier signal obtained by the inverse discrete Fourier transform of the transmission signal. A signal with a time width corresponding to the transient response time of the filter used is added.

According to this method, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having a steep cutoff characteristic is used, the transient response is hardly increased and the circuit scale is hardly increased. It is possible to reduce the waveform distortion due to and improve the transmission characteristics.

In the multicarrier communication method of the present invention, in the above method, when a signal is added to the beginning or the end or one of the beginning and the end of one burst of the multicarrier signal, the first valid signal in the multicarrier signal is added. In the symbol, the signal of the trailing interval corresponding to the rising transient response time of the filter or any time longer than this transient response time is added to the beginning of the first valid symbol, and in the last valid symbol in the multicarrier signal, The signal of the leading section corresponding to the falling transient response time of the filter or any time longer than this transient response time is added to the end of the last effective symbol.

According to this method, since the waveform distortion due to the transient response of the filter means can be sufficiently reduced, even when the filter means having a steep cutoff characteristic is used, the transient response is hardly increased without increasing the circuit scale. It is possible to reduce the waveform distortion of the head and tail of the one-burst multi-carrier signal or the effective symbol at either the head or the tail and improve the transmission characteristics.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG.1 is a block diagram showing a configuration of a transmission system of a multicarrier communication apparatus according to Embodiment 1 of the present invention.

Multicarrier communication device 1 shown in FIG.
00 is a filter by adding a transient response guard interval, which is a pre-guard interval 201 and a post-guard interval 207, which will be described later, to the beginning and end of the one-burst multicarrier signal sequence 200 as shown in FIG. The waveform distortion due to the transient response is reduced, thereby improving the transmission characteristics.

Such a multi-carrier communication device 100
Is an IFFT unit 101 and a guard section addition processing unit 102.
Lamp processing unit 103, D / A conversion unit 104, L
The guard section addition processing unit 102 is configured to include a PF 105 and a control unit 106.
And a selector 109.

The IFFT section 101 performs IFFT processing (inverse discrete Fourier transform processing) on the digital transmission signal that has been subjected to channel coding and modulation processing.

The guard section addition processing unit 102 uses the IFFT
The processed signal is delayed by the delay unit 107 for Ts time which is the effective symbol section length, and then the selector 10
9 and after being delayed by the delay unit 2Ts which is twice the effective symbol section length, output to the selector 109. Further, the selector 109 responds to the control signal from the control unit 106. , The ramp processing unit 1 outputs the signal with the guard interval added by switching each input.
It outputs to 03.

The ramp processing section 103 applies a window function to the signal output from the selector 109 in order to suppress out-of-band unwanted radiation due to discontinuity between multicarrier symbols.

The D / A conversion unit 104 includes the ramp processing unit 10.
The digital signal from 3 is converted into an analog signal.

The LPF 105 removes the out-of-band signal component of the analog signal converted by the D / A converter 104 and outputs it to an analog processing system circuit (not shown).

The multi-carrier signal sequence 200 output from the LPF 105 has a pre-guard section 201 at the beginning and a reception gain control in the receiver, as shown in FIG.
A preamble 202 for performing frequency synchronization, symbol timing synchronization, and channel distortion estimation, some guard intervals (GI) 203, 205, and an effective symbol interval 20.
4, 206 and the post guard section 207 at the end.

The operation of multicarrier communication apparatus 100 having such a configuration will be described.

First, the transmission data is converted into a time waveform by the IFFT section 101, and the guard section addition processing section 10 is executed.
2 to the selector 109, the delay devices 107 and 10
8 is input. The IFFT processed signals input to the delay devices 107 and 108 are delayed by a predetermined time (Ts and 2Ts) and then input to the selector 109.

In the selector 109, the input IFFT
A processed signal, a signal obtained by delaying this signal by Ts and 2Ts, and a signal in a predetermined section of these signals are selected by switching according to the control signal, and by this selection,
Multicarrier signal sequence 200 to which a preguard section 201, a guard section 205, and a postguard section 207 are added
Is generated and output to the ramp processing unit 103.

That is, when the preamble 202 having, for example, one effective symbol section is added to the multicarrier signal as in the first embodiment, the data of the end section in the effective symbol section of the preamble 202 is the preguard section. As 201, it is arranged at the beginning of the preamble 202 (the beginning of the effective symbol section).

When the preamble 202 having a plurality of effective symbol sections is added, the data of the end section of the first effective symbol section of the preamble 202 is the preamble 20 as the preguard section 201.
It is arranged at the beginning of 2 (the beginning of the first effective symbol section).

Next, as described in the conventional example, the data of the end section of the effective symbol sections 204 and 206 is used as the guard sections (GI) 203 and 205 and the effective symbol section 20.
4, 206, and finally, the data of the head section in the last effective symbol section 206 of the multicarrier signal is arranged as the post guard section 207 at the end of the last effective symbol section 206.

However, the end section in the first effective symbol section of the preamble 202 corresponds to a time longer than the rising time of the LPF 105, and the start section in the last effective symbol section 206 of the multicarrier signal is the LPF 105. This corresponds to a time longer than the fall time of.

In the first embodiment, the example in which the preamble 202 is added to the one-burst multicarrier signal is shown. However, when the preamble 202 is not added, the first burst of the multicarrier signal is included. The data of the end section in the effective symbol section is placed at the beginning of the first effective symbol section as the pre-guard section 201.

Selector 1 for performing such an arrangement
The switching timing of 09 will be described in detail with reference to FIG.

FIG. 3 shows the effective symbol output from the IFFT section 101, the waveform input to the selector 109, the input switching timing of the selector 109, and the selector 109.
Represents an output signal.

In FIG. 3, A is an output signal of the IFFT unit 101, B is a signal selected by the selector 109 from the signals directly output from the IFFT unit 101, and C is a selector from the output signals of the delay unit 107. 109 is a signal selected by the selector 109, D is a signal selected by the selector 109 from the output signals of the delay device 108, and E is the selector 1
09 output signal.

At time t1, as shown by A, the IF
When the effective symbol 1 (effective symbol of the preamble 202) obtained by the IFFT processing of the FT unit 101 is output, the selector 109 causes the rise time of the LPF 105 at the effective symbol 1 as shown at time t2 to t3 of B. The data of the tail section corresponding to (or any time longer than the rising time) is selected (first selection).

By this first selection, the preamble 2
Data (Pr
eGI) is output from the selector 109 as indicated by E.

That is, the data of the end section of the effective symbol 1 in the preamble 202 is the pre-guard section 201.
Will be placed at the beginning of the effective symbol 1.

Next, as shown in C, the selector 109 outputs the output signal of the delay device 107 at the time corresponding to the same delay time as the effective symbol section set in the delay device 107, simultaneously with the completion of the first selection. Select only between t3 and t4 (second
Select).

By this second selection, the preamble 2
The data of the effective symbol 1 in 02 is output from the selector 109 as indicated by E. That is, the data of the effective symbol 1 in the preamble 202 is arranged next to the preguard section 201.

Next, at the same time as the second selection is completed, the selector 109, at time t4 to t5 in the effective symbol 2 (effective signal section 204 of the information signal) already output from the IFFT section 101 as shown in A. The data of the end section shown is selected (third selection).

The tail section selected by the third selection corresponds to the guard section 203 for eliminating an adverse effect on the way of propagation to the receiver, and is output from the selector 109 as indicated by E.

That is, the data of the tail section of the effective symbol 2 in the information signal is arranged as the guard section 203 next to the preamble 202.

Next, as shown in C, the selector 109 makes the second selection at the same time as the end of the third selection.
As a result, the data of the effective symbol 2 is output from the selector 109 as indicated by E. That is, the data of the effective symbol section 204 is arranged next to the guard section 203.

Thereafter, similarly, the third and second selections are performed at time t6.
Are alternately repeated until the last valid symbol n of the multicarrier signal. As a result, the guard section 205 is arranged at the beginning of the last effective symbol section 206.

Simultaneously with the end of the second selection in which the last valid symbol n of the multi-carrier signal is selected, the valid signal output from the delay device 108 is output only from time t6 to t7 corresponding to the head section of the valid symbol n. The symbol n is selected (fourth selection).

By the fourth selection, the data (PostGI) in the head section in the last effective symbol n is
It is output from the selector 109 as indicated by E.

That is, the post-guard section 207 is arranged at the end of the last effective symbol section 206 in the one-burst multicarrier signal sequence 200.

As a result, transient response guard sections 201 and 207 are added to the beginning and the end of the lump of multicarrier signal sequence 200 that is continuously transmitted.

The output signal of the guard section addition processing unit 102 to which the guard sections 201 and 207 are added is output to the ramp processing unit 103, where the start portion and the end portion of one multicarrier symbol are weighted. Is done
As a result, the waveform is shaped in order to suppress unnecessary radiation to the outside of the band due to discontinuity between symbols, and after that, the D / A conversion unit 104 converts the waveform into an analog signal, and then the LPF 105.
The signal is band-limited by and transmitted through an analog processing circuit.

As described above, according to the multicarrier communication device 100 of the first embodiment, the transient response guard interval 2 is added at the beginning and end of the one burst multicarrier signal sequence 200.
Since 01 and 207 are added, LPF10
The transmission waveform distortion due to the transient response of the rising and falling edges of 5 can be absorbed in the transient response guard section, whereby the transmission characteristic can be improved.

(Embodiment 2) FIG. 4 is a timing chart for explaining the operation of the guard interval addition processing section in the multicarrier communication apparatus according to Embodiment 2 of the present invention.

The configuration of the multicarrier communication apparatus according to the second embodiment is the same as that of the multicarrier communication apparatus 1 according to the first embodiment.
However, the difference is that the transient response guard section is added only to the end of the one-burst multicarrier signal sequence 200 by the control signal output from the control unit 106.

The operation of guard interval addition processing section 102, which is a characteristic element in the multicarrier communication apparatus according to the second embodiment, will be described below with reference to FIG.

FIG. 4 shows the effective symbol output from the IFFT section 101, the waveform input to the selector 109, the input switching timing of the selector 109, and the selector 109.
Represents an output signal.

In FIG. 4, A is an output signal of the IFFT unit 101, B is a signal selected by the selector 109 from the signals directly output from the IFFT unit 101, and C is a selector from the output signals of the delay unit 107. 109 is a signal selected by the selector 109, D is a signal selected by the selector 109 from the output signals of the delay device 108, and E is the selector 1
09 output signal.

At time t1, as shown by A, IF
When the effective symbol 1 (effective symbol of the preamble 202) obtained by the IFFT processing of the FT unit 101 is output, the selector 109 selects the data of the end section indicated by the time t2 to t3 in the effective symbol 1 (first
Select).

The tail section selected by this first selection corresponds to the guard section (GI) 203 for eliminating the adverse effect on the way of propagation to the receiver, and is output from the selector 109 as indicated by E. To be done.

That is, the data of the tail section of the effective symbol 1 in the preamble 202 is arranged as the guard section (GI) at the position of the pre-guard section 201 shown in FIG.

Next, as shown in C, the selector 109 outputs the output signal of the delay device 107 at the time corresponding to the same delay time as the effective symbol section set in the delay device 107, simultaneously with the completion of the first selection. Select only between t3 and t4 (second
Select).

By this second selection, the preamble 2
The data of the effective symbol 1 in 02 is output from the selector 109 as indicated by E. That is, the data of the effective symbol 1 in the preamble 202 is arranged next to the guard interval (GI).

Thereafter, similarly, the first and second selections are performed at time t6.
Are alternately repeated until the last valid symbol n of the multicarrier signal. As a result, the guard sections 203 and 205 are arranged at the beginning of the last effective symbol sections 204 and 206.

Then, at the same time as the end of the second selection in which the last effective symbol n of the multicarrier signal is selected, the effective signal output from the delay device 108 is output only from time t6 to t7 corresponding to the head section of the effective symbol n. The symbol n is selected (third selection).

By this third selection, the data (PostGI) of the head section in the last effective symbol n is
It is output from the selector 109 as indicated by E.

That is, the post-guard section 207 is arranged at the end of the last effective symbol section 206 in the one-burst multicarrier signal sequence 200.

As a result, the transient response guard section 207 is added to the end of the lump of multicarrier signal sequence 200 transmitted continuously.

As described above, according to the multicarrier communication apparatus of the second embodiment, the transient response guard section 207 is added to the end of the lump of multicarrier signal sequence 200 that is continuously transmitted. , The transmission waveform distortion due to the transient response of the fall of the LPF 105 can be absorbed in the transient response guard section 207.
The transmission characteristics can be improved.

(Embodiment 3) FIG. 5 is a block diagram showing a configuration of a transmission system of a multicarrier communication apparatus according to Embodiment 3 of the present invention. However, in the third embodiment shown in FIG. 5, parts corresponding to the respective parts of the first embodiment in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted.

Multicarrier communication apparatus 500 of the third embodiment is the same as multicarrier communication apparatus 1 of the first embodiment.
The difference from 00 is the guard section addition processing section 501 including the delay unit 107 and the selector 109, and the control performed by the control section 502 with respect to the guard section addition processing section 501. Is a control signal
The transient response guard interval is added only to the beginning of the one-burst multicarrier signal sequence 200.

The operation of guard interval addition processing section 501, which is a characteristic element in multicarrier communication apparatus 500 of the third embodiment, will be described below with reference to FIG.

FIG. 6 shows the effective symbol output from the IFFT section 101, the waveform input to the selector 109, the input switching timing of the selector 109, and the selector 109.
Represents an output signal.

In FIG. 3, A is an output signal of the IFFT unit 101, B is a signal selected by the selector 109 from the signals directly output from the IFFT unit 101, and C is a selector from the output signals of the delay unit 107. A signal selected by 109, and D represents an output signal of the selector 109.

At time t1, as shown by A, IF
When the effective symbol 1 (effective symbol of the preamble 202) obtained by the IFFT processing of the FT unit 101 is output, the selector 109 causes the rise time of the LPF 105 at the effective symbol 1 as shown at time t2 to t3 of B. The data of the tail section corresponding to (or any time longer than the rising time) is selected (first selection).

By this first selection, the preamble 2
Data (Pr
eGI) is output from the selector 109 as indicated by D. That is, the data of the end section of the effective symbol 1 in the preamble 202 is arranged at the beginning of the effective symbol 1 as the pre-guard section 201.

Next, as shown in C, the selector 109 outputs the output signal of the delay device 107 at the time corresponding to the same delay time as the effective symbol section set in the delay device 107 at the same time when the first selection is completed. Select only between t3 and t4 (second
Select).

By this second selection, the preamble 2
The data of the effective symbol 1 in 02 is output from the selector 109 as shown in D. That is, the data of the effective symbol 1 in the preamble 202 is arranged next to the preguard section 201.

Next, at the same time when the second selection is completed, the selector 109, at the time t4 to t5 in the effective symbol 2 (the effective symbol section 204 of the information signal) already output from the IFFT section 101 as shown in A. The data of the end section shown is selected (third selection).

The tail section selected by the third selection corresponds to the guard section 203 for eliminating an adverse effect on the way of propagation to the receiver, and is output from the selector 109 as shown by D.

That is, the data of the tail section of the effective symbol 2 in the information signal is arranged as the guard section 203 after the preamble 202.

Next, as shown in C, the selector 109 makes the second selection at the same time as the end of the third selection.
As a result, the data of the effective symbol 2 is output from the selector 109 as shown by D. That is, the data of the effective symbol section 204 is arranged next to the guard section 203.

Thereafter, similarly, the third and second selections are performed at time t6.
Are alternately repeated until the last valid symbol n of the multicarrier signal. As a result, the guard section 205 is arranged at the beginning of the last effective symbol section 206.

As a result, the transient response guard section 201 is added to the beginning and end of the lump of multicarrier signal sequences 200 that are continuously transmitted. In the process of the third embodiment, the post guard section 207 is not added.

As described above, according to the multicarrier communication device 500 of the third embodiment, the transient response guard interval 201 is added to the beginning of the lump of multicarrier signal sequence 200 that is continuously transmitted. So LPF105
The transmission waveform distortion due to the transient response at the rising edge can be absorbed in the transient response guard section 201, whereby the transmission characteristic can be improved.

[0104]

As described above, according to the present invention,
Even when a filter having large fluctuations in the transient response of rising / falling is applied, it is possible to reduce the transmission characteristic deterioration due to the transmission waveform distortion caused by the transient response of the filter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a transmission system of a multicarrier communication apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a 1-burst multicarrier signal sequence generated by the multicarrier communication apparatus according to the first embodiment.

FIG. 3 is a timing chart for explaining the operation of a guard interval addition processing unit in the multicarrier communication device according to the first embodiment.

FIG. 4 is a timing chart for explaining the operation of a guard interval addition processing unit in the multicarrier communication device according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a transmission system of a multicarrier communication apparatus according to Embodiment 3 of the present invention.

FIG. 6 is a timing chart for explaining the operation of a guard interval addition processing unit in the multicarrier communication device according to the third embodiment.

FIG. 7 is a block diagram showing a configuration of a transmission system of a conventional multicarrier communication device.

FIG. 8: 1 generated by a conventional multicarrier communication device
Configuration diagram of burst multi-carrier signal sequence

[Explanation of symbols] 100,500 multi-carrier communication device 101 IFFT section 102,501 Guard section addition processing unit 103 Lamp processing unit 104 D / A converter 105 LPF 106,502 control unit 200 multi-carrier signal train 201 Pre-guard section 202 preamble 203,205 Guard interval (GI) 204,206 Effective symbol section 207 Post guard section

Continuation of the front page (56) Reference JP-A-2002-237804 (JP, A) JP-A-2000-68975 (JP, A) JP-A-2000-32565 (JP, A) JP-A-8-321820 (JP, A) JP 10-135924 (JP, A) JP 2001-168834 (JP, A) JP 2001-1003032 (JP, A) JP 2000-165341 (JP, A) JP 2000-68972 (JP, A) ) Japanese Patent Laid-Open No. 2000-244445 (JP, A) Japanese Patent Publication No. 9-512156 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04J 11/00

Claims (11)

(57) [Claims] 1. A guard interval addition for adding a signal having a time width corresponding to a transient response time of a filter used for filtering the multicarrier signal to the beginning and the end of one burst of the multicarrier signal subjected to the inverse discrete Fourier transform. A multi-carrier communication device comprising: a processing unit. 2. The guard section addition processing means adds a signal having a time width corresponding to the transient response time of the filter,
At the beginning of the first effective symbol in the first effective symbol in one burst of the multi-carrier signal, a signal in the tail section corresponding to the rising transient response time of the filter or any time longer than this transient response time is added to the beginning of the first effective symbol. , The signal of the leading section corresponding to the falling transient response time of the filter or any time longer than this transient response time in the last effective symbol in the one-burst multicarrier signal is added to the end of the last effective symbol. The multicarrier communication device according to claim 1, wherein the multicarrier communication device is added. 3. Guard section addition processing means for adding a signal having a time width corresponding to the transient response time of a filter used for filtering the multicarrier signal to the end of the one-burst multicarrier signal subjected to the inverse discrete Fourier transform. A multicarrier communication device comprising: 4. The guard section addition processing means adds a signal having a time width corresponding to the transient response time of the filter,
At the last effective symbol in the one-burst multicarrier signal, the signal of the leading section corresponding to the falling transient response time of the filter or any time longer than this transient response time is added to the end of the last effective symbol. The multicarrier communication device according to claim 3, wherein 5. Guard section addition processing means for adding a signal having a time width corresponding to a transient response time of a filter used for filtering the multicarrier signal to the head of the multicarrier signal of one burst subjected to the inverse discrete Fourier transform. A multicarrier communication device comprising: 6. The guard section addition processing means adds a signal having a time width corresponding to a transient response time of the filter,
Adding a signal in a tail section corresponding to a rising transient response time of the filter or an arbitrary time equal to or longer than the transient response time in the first effective symbol in the multi-carrier signal of one burst to the head of the first effective symbol. The multicarrier communication device according to claim 5, wherein 7. A mobile station apparatus comprising the multicarrier communication apparatus according to any one of claims 1 to 6. 8. A base station apparatus comprising the multicarrier communication apparatus according to claim 1. Description: 9. The mobile station device according to claim 7 or claim 8.
A mobile communication system comprising the described base station device. 10. A transient response time of a filter used for filtering the multicarrier signal at the beginning and the end, or at the beginning and the end of one burst of the multicarrier signal obtained by the inverse discrete Fourier transform of the transmission signal. A multi-carrier communication method characterized by adding a signal having a time width corresponding to. 11. A rising transient response time of a filter or a rising transient response time of a filter in a first effective symbol in the multi-carrier signal when the signal is added to the head and the tail or one of the head and the tail of one burst multi-carrier signal. A signal in the tail section corresponding to an arbitrary time equal to or longer than the transient response time is added to the head of the first effective symbol, and the falling transient response time of the filter or this transient at the last effective symbol in the multicarrier signal. 11. The multicarrier communication method according to claim 10, wherein a signal in the head section corresponding to an arbitrary time longer than the response time is added to the end of the last valid symbol.