JP6742138B2 - OFDM signal transmitter and OFDM signal receiver - Google Patents

Description

The present invention relates to an OFDM signal transmission device and an OFDM signal reception device that expand the bandwidth of an OFDM signal.

Conventionally, ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) has been used as the current terrestrial digital broadcasting system in Japan (for example, see Non-Patent Document 1). In ISDB-T, the frequency bands of a plurality of orthogonal frequency division multiplexed (OFDM) subcarriers allocated to one broadcast wave (channel) are divided into 13 segments.

Twelve of the 13 segments are used for high-definition broadcasting for fixed reception and multiple standard-definition broadcasting, and the remaining 1 segment is used for broadcasting for mobile reception. In the frequency bands of these 13 segments, broadcasting data is transmitted at the same time.

Moreover, ISDB-T is adopted not only in Japan but also in South America and other countries around the world. In many countries adopting ISDB-T, a bandwidth of 6 MHz is used for one channel, and the same ISDB-T signal is used. However, the definition of the spectrum mask of the broadcast wave transmitted from the OFDM signal transmitter differs depending on each country.

On the other hand, new next-generation terrestrial digital broadcasting, which replaces the existing terrestrial digital broadcasting, is under consideration. For next-generation terrestrial digital broadcasting, it is required to provide services such as 3D high-definition broadcasting or super high-definition broadcasting having 16 times the resolution of high-definition broadcasting instead of conventional high-definition broadcasting for fixed reception at home. ing. Services such as Super Hi-Vision broadcasting have more information than conventional Hi-Vision broadcasting.

Similarly, for mobile reception, it is required to provide high-definition class services. Similar to the current ISDB-T, it is necessary to simultaneously provide these two services for fixed reception and mobile reception using one channel.

ARIB STD-B31, "Transmission system for terrestrial digital television broadcasting"

In ISDB-T, which is the current terrestrial digital broadcasting system, a segment structure using frequency division multiplexing is adopted. Specifically, the segment structure of the signal has a bandwidth of 428.57... kHz (6000/14 kHz) per segment, and a bandwidth of 5.57 MHz for 13 segments, which is fixed. It has a signal structure. That is, in a bandwidth of 6 MHz per channel, the bandwidth available for transmitting and receiving signals is 5.57 MHz, and the bandwidth is fixed.

Therefore, in ISDB-T, there is almost no space in the spectrum mask for transmitting an OFDM signal and the signal structure is fixed, so this cannot be changed, and the band is widened to increase the transmission rate. There was a problem that it could not be improved.

Further, the above-mentioned next-generation terrestrial digital broadcasting system is being studied so that it will be adopted not only in Japan but in other countries around the world. Therefore, it is desirable that the bandwidth of the next-generation terrestrial digital broadcasting system can be changed so that it can be applied to the spectrum mask of each country, and it is desirable that the transmission rate be improved even a little.

Then, this invention is made in order to solve the said subject, The objective is to provide the OFDM signal transmitter and OFDM signal receiver which can widen the band of an OFDM signal and can improve a transmission rate. To do.

In order to solve the above-mentioned problems, the OFDM signal transmitting apparatus according to claim 1 is an OFDM signal transmitting apparatus that transmits an OFDM signal in a band of a spectrum mask including a segment area of a segment structure, wherein the segment in the spectrum mask is included. Inputting first data transmitted in a band of a region, modulating the first data to generate a first data carrier, and a region other than the segment region in the spectrum mask, A carrier modulation unit for inputting second data transmitted in a band of an end region of the spectrum mask and modulating the second data to generate a second data carrier, and a carrier modulation unit generated by the carrier modulation unit. said first data a first pilot carrier carriers and is preset to be set to the segment area, and a is generated the second data carrier and pre Me set by the carrier modulation unit A framing unit that configures an OFDM frame and an OFDM frame signal configured by the framing unit are IFFTed so that two pilot carriers are added to the end region, and a frequency domain signal is converted to a time domain signal. A transmission for transmitting the OFDM signal through the transmission antenna in the band of the spectrum mask including the IFFT unit for converting and the time domain signal converted by the IFFT unit, including the segment region and the end region. And the framing unit arranges the second pilot carriers in the end region at intervals of a predetermined density narrower than that of the first pilot carriers in the segment region. ..

An OFDM signal transmitting apparatus according to claim 2 is the OFDM signal transmitting apparatus according to claim 1 , further comprising a plurality of transmitting antennas, and receiving the OFDM signals transmitted via the plurality of transmitting antennas. A feature is that a MIMO transmission system is configured with a receiving device.

Further, the OFDM signal receiving device according to claim 3 is the OFDM signal receiving device for receiving an OFDM signal in a band of a spectrum mask including a segment region of a segment structure, wherein the segment region and the segment region in the spectrum mask are included. In a band of the spectrum mask that is a region other than the region including the end region of the spectrum mask, a reception unit that receives the OFDM signal via a reception antenna and an FFT that receives the OFDM signal received by the reception unit. Then, while extracting the first pilot carrier set in the segment region from the FFT unit that converts the signal in the time domain into a signal in the frequency domain, and the signal in the frequency domain converted by the FFT unit , A second pilot carrier added to the end region, the pilot extracting unit extracting the second pilot carrier arranged at a predetermined density interval narrower than the first pilot carrier in the segment region ; A channel for estimating channel characteristics at each position of an OFDM frame corresponding to the segment area and the end area based on the first pilot carrier and the second pilot carrier extracted by the pilot extracting unit An estimation unit and a signal in the frequency domain converted by the FFT unit are demodulated by using the transmission path characteristics estimated by the channel estimation unit, and the first data carrier and the end set in the segment region are demodulated. A demodulation unit that generates a demodulation signal of an OFDM frame corresponding to the second data carrier added to the area, and a demodulation signal of the OFDM frame that is generated by the demodulation unit are deframed, and the OFDM signal is transmitted. A deframer for generating a first demodulated signal corresponding to the original first data carrier in the signal transmitter and a second demodulated signal corresponding to the original second data carrier in the OFDM signal transmitter. , Is provided.

An OFDM signal receiving apparatus according to claim 4 is the OFDM signal receiving apparatus according to claim 3 , further comprising a plurality of receiving antennas and transmitting the OFDM signal via a plurality of transmitting antennas. It is characterized in that a MIMO transmission system is configured between them.

As described above, according to the present invention, it is possible to widen the band of the OFDM signal and improve the transmission rate.

FIG. 3 is a block diagram showing a configuration example of the OFDM signal transmission device of the first embodiment. FIG. 9 is a block diagram showing a configuration example of an OFDM signal transmission device of a second embodiment. FIG. 9 is a block diagram showing a configuration example of an OFDM signal transmission device of a third embodiment. FIG. 9 is a block diagram showing a configuration example of an OFDM signal transmission device of a fourth embodiment. FIG. 16 is a block diagram showing a configuration example of an OFDM signal transmission device of a fifth embodiment. FIG. 3 is a block diagram showing a configuration example of an OFDM signal receiving apparatus of Examples 1 and 2. FIG. 9 is a block diagram showing a configuration example of an OFDM signal receiving apparatus according to a third embodiment. FIG. 9 is a block diagram showing a configuration example of an OFDM signal receiving device of a fourth embodiment. FIG. 11 is a block diagram showing a configuration example of an OFDM signal receiving device of a fifth embodiment. It is a figure which shows the example of the band and spectrum mask of the OFDM signal by the next-generation terrestrial digital broadcasting. FIG. 6 is a diagram illustrating end regions α1 and α2 of the spectrum mask according to the first exemplary embodiment. FIG. 9 is a diagram illustrating end regions α1 and α2 of the spectrum mask in the second embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
[Signal structure of next-generation terrestrial digital broadcasting]
First, the signal structure of next-generation terrestrial digital broadcasting will be described. FIG. 10 is a diagram showing an example of a band and a spectrum mask of an OFDM signal by the next-generation terrestrial digital broadcasting, and shows a structure currently under consideration. The horizontal axis represents frequency.

In the next-generation terrestrial digital broadcasting, a bandwidth (6000/36=166.66...kHz) obtained by dividing a 6 MHz band into 36 is used as one segment, and 33 segments out of 36 segments can be used. Being considered. The bandwidth of 33 segments, that is, the bandwidth of the OFDM signal is 6000/36×33≈5500 kHz.

On the other hand, the Japanese spectrum mask is specified with a bandwidth of 5580 kHz. In the spectrum mask, there is a vacancy of 40 kHz on one side and a vacancy of 80 kHz on both sides in total (end regions α1 and α2 in FIG. 10).

Since the bandwidth of one segment is 166.66...kHz, even if the end regions α1 and α2, which are free regions of 80 kHz, are used, one segment cannot be added.

Therefore, in the embodiment of the present invention, the band of the OFDM signal is widened and the transmission rate is improved by using the edge regions α1 and α2 of 80 kHz in total shown in FIG. The band of the OFDM signal defined as the area for transmitting the OFDM signal in the spectrum mask of one channel is defined as a segment area β. The end regions α1 and α2 are empty bands existing at the ends of the spectrum mask of one channel, and are bands where the OFDM signal is not transmitted, that is, empty regions other than the segment region β. The segment region β has a segment structure having 33 segments.

Here, the spectrum mask refers to a band defined to perform transmission/reception in the band within the spectrum mask. A blank band exists between the spectrum mask and the adjacent spectrum mask so as not to affect the transmission and reception by each channel. A spectrum mask can inherently extend its band to an allowable range that does not affect mutual transmission/reception between adjacent spectrum masks.

Hereinafter, Examples 1 to 4 will be described as embodiments of the present invention, and will be specifically described. The first embodiment is an example in which the band of the OFDM signal is widened by adding data carriers to the end regions α1 and α2 in the spectrum mask. The second embodiment is an example in which a band of an OFDM signal is widened by adding a data carrier and a pilot carrier to the end regions α1 and α2 in the spectrum mask. The third embodiment is an example of widening the band of the OFDM signal by adding pilot carriers to the end regions α1 and α2 in the spectrum mask.

The fourth embodiment is an example in which frequency interleaving or time interleaving is applied to all the data carriers set in the segment area β and the data carriers added to the end areas α1 and α2 in the first and second embodiments. Is. The fifth embodiment is an example in which the band information such as the information about the segment region β and the information about the end regions α1 and α2 is included in the TMCC signal and transmitted and received in the first to fourth embodiments.

[Example 1]
First, the first embodiment will be described. As described above, the first embodiment is an example in which the band of the OFDM signal is widened by adding the data carriers to the end regions α1 and α2 in the spectrum mask.

FIG. 11 is a diagram illustrating edge regions α1 and α2 of the spectrum mask according to the first embodiment. The horizontal axis represents frequency. As shown in FIG. 11, data carriers are added to the end regions α1 and α2. Assuming that the carrier interval of the OFDM signal is 0.5 kHz, 80 data carriers can be added to each of the end regions α1 and α2, and a total of 160 data carriers can be added to the end regions α1 and α2. Can be added.

(OFDM signal transmitter/Example 1)
FIG. 1 is a block diagram illustrating a configuration example of the OFDM signal transmission device according to the first embodiment. The OFDM signal transmission device 1-1 includes a transmission antenna 10, carrier modulation units 11 and 12, a framing unit 13-1, an IFFT unit 14, and a transmission unit 15. In FIG. 1, only components and data directly related to the present invention are shown, and components and data not directly related to the present invention are omitted. The same applies to FIG. 2 and the like described later.

The carrier modulator 11 inputs the data a transmitted in the band of the segment area β in the spectrum mask shown in FIG. 11, and modulates the data a with a preset parameter of the modulation method such as 1024QAM. , And outputs the data carrier a1 to the framing unit 13-1.

The carrier modulator 12 inputs the data b transmitted in the bands of the end regions α1 and α2 in the spectrum mask shown in FIG. 11, and uses the data b as a parameter of a preset modulation method such as 1024QAM. It modulates and outputs the data carrier b1 to the framing unit 13-1.

The framing unit 13-1 inputs the data carrier a1 from the carrier modulation unit 11, inputs the data carrier b1 from the carrier modulation unit 12, and inputs the preset pilot carrier a2. Then, the framing unit 13-1 sets the OFDM frame so that the data carrier a1 and the pilot carrier a2 are set in the band of the segment region β and the data carrier b1 is added to the band of the end regions α1 and α2. Constitute. The framing unit 13-1 outputs the OFDM frame signal to the IFFT unit 14.

The framing unit 13-1 includes a segment area framing unit 20, an end area framing unit 21-1 and a synthesizing unit 22. The segment area framing means 20 inputs the data carrier a1 from the carrier modulator 11 and the pilot carrier a2.

The segment area framing means 20 arranges these carriers at predetermined carrier positions and symbol positions so as to set the data carrier a1 and pilot carrier a2 in the band of the segment area β, and configures an OFDM frame of the segment area β. To do. Since the data carrier a1 and the pilot carrier a2 are arranged at predetermined carrier positions and symbol positions to form an OFDM frame of the segment area β, these carriers are transmitted to the band of the segment area β in the spectrum mask by the transmission unit 15. Sent. The segment area framing means 20 outputs the OFDM frame signal of the segment area β to the synthesizing means 22.

The end region framing means 21-1 inputs the data carrier b1 from the carrier modulator 12. Then, the end region framing means 21-1 arranges the data carrier b1 at all carrier positions and symbol positions so that the data carrier b1 is added to the bands of the end regions α1 and α2, and the end regions α1 and α2 are arranged. Construct an OFDM frame. Since the data carrier b1 is arranged at all carrier positions and symbol positions to form the OFDM frames of the end regions α1 and α2, these carriers are transmitted to the bands of the end regions α1 and α2 in the spectrum mask by the transmission unit 15. Sent. The end region framing unit 21-1 outputs the signals of the OFDM frames of the end regions α1 and α2 to the combining unit 22.

The synthesizing unit 22 inputs the OFDM frame signal of the segment region β from the segment region framing unit 20 and the OFDM frame signals of the end regions α1 and α2 from the end region framing unit 21-1. Then, the synthesizing unit 22 synthesizes the OFDM frame signal of the segment region β and the OFDM frame signal of the end regions α1 and α2 to obtain the OFDM frames corresponding to the end regions α1 and α2 and the segment region β shown in FIG. Constitute. The synthesizing unit 22 outputs the OFDM frame signal to the IFFT unit 14.

The IFFT unit 14 inputs an OFDM frame signal from the combining unit 22 of the framing unit 13-1, IFFTs the OFDM frame signal, and converts the frequency domain signal into a time domain signal. Then, the IFFT unit 14 outputs the time domain signal to the transmission unit 15.

The transmission unit 15 inputs the time domain signal from the IFFT unit 14, and performs GI (guard interval) addition, D/A conversion, filter processing by an LFP (low pass filter), frequency conversion processing, etc. on the time domain signal. Give. Then, the transmitting unit 15 transmits the broadcast wave of the OFDM signal in the bands of the end regions α1 and α2 and the segment region β shown in FIG. 11 via the transmitting antenna 10.

As described above, according to the OFDM signal transmitter 1-1 of the first embodiment, the data carrier b1 is added to the end regions α1 and α2 in the spectrum mask. As a result, the bandwidth can be expanded to the bandwidth of the spectrum mask with respect to the basic structure of the segment region β of 33 segments. Therefore, it is possible to widen the band of the OFDM signal and improve the transmission rate. Further, by matching the spectrum mask, the edge regions α1 and α2, and the segment region β with the band specified in each country, it is possible to maximize the transmission rate while supporting different spectrum masks in each country.

(OFDM signal receiver/Example 1)
FIG. 6 is a block diagram showing a configuration example of the OFDM signal receiving apparatus according to the first and second embodiments. The OFDM signal receiving apparatus 2-1 of the first embodiment includes a receiving antenna 30, a receiving unit 31, an FFT unit 32, a pilot extracting unit 33-1, a channel estimating unit 34-1, a demodulating unit 35, and a deframing unit 36-1. Equipped with. The OFDM signal receiving device 2-1 receives the broadcast wave of the OFDM signal transmitted from the OFDM signal transmitting device 1-1 shown in FIG. 1 in the bands of the end regions α1 and α2 and the segment region β shown in FIG. To receive.

The reception unit 31 corresponds to the transmission unit 15 illustrated in FIG. 1 and receives the broadcast wave of the OFDM signal from the OFDM signal transmission device 1-1 via the reception antenna 30. Then, the receiving unit 31 performs processing such as frequency conversion, A/D conversion, and GI removal on the received signal, and outputs the OFDM signal to the FFT unit 32.

The FFT unit 32 corresponds to the IFFT unit 14 shown in FIG. 1, receives the OFDM signal from the receiving unit 31, performs FFT on the OFDM signal, and converts the time domain signal into the frequency domain signal. Then, the FFT unit 32 outputs the signals in the frequency domain (the signals at the carrier position and the symbol position of the OFDM frame corresponding to the end regions α1, α2 and the segment region β) to the pilot extraction unit 33-1 and the demodulation unit 35.

The pilot extraction unit 33-1 inputs the frequency domain signal from the FFT unit 32, and extracts pilot carriers at predetermined carrier positions and symbol positions in the OFDM frame corresponding to the segment region β from the frequency domain signal. Then, pilot extraction section 33-1 outputs the pilot carrier to channel estimation section 34-1.

The channel estimation unit 34-1 inputs the pilot carrier from the pilot extraction unit 33-1 and estimates the channel characteristic (transmission path characteristic) based on the input pilot carrier and the preset transmission pilot carrier. In this case, the transmission path characteristics of the carrier position and the symbol position of the OFDM frame corresponding to the end regions α1, α2 and the segment region β can be obtained by the interpolation processing or the like.

The demodulation unit 35 inputs the frequency domain signal from the FFT unit 32, and also inputs the transmission path characteristic from the channel estimation unit 34-1. Then, the demodulation unit 35 divides the frequency domain signal by the transmission path characteristic to demodulate (equalize), and demodulates the frequency domain signal into demodulated signals (end areas α1, α2 and segment area β) of the OFDM frame. The corresponding demodulated signal) is output to the deframer 36-1.

The deframing unit 36-1 corresponds to the framing unit 13-1 shown in FIG. 1, and receives the demodulation signal of the OFDM frame from the demodulation unit 35. Then, the deframing unit 36-1 deframes the demodulated signal of the OFDM frame to generate a demodulated signal a1′ corresponding to the original data carrier a1 and a demodulated signal b1′ corresponding to the original data carrier b1. The demodulated signals a1' and b1' are output. Then, demodulated data a', b'corresponding to the original data a, b'is obtained from the demodulated signals a1', b1'.

The deframing unit 36-1 includes a separating unit 40, a segment area deframing unit 41, and an end area deframing unit 42-1. The separating means 40 corresponds to the combining means 22 shown in FIG. 1 and receives the demodulated signal of the OFDM frame from the demodulation section 35. Then, the separating means 40 separates the demodulated signal of the OFDM frame into the demodulated signal of the OFDM frame corresponding to the segment region β and the demodulated signal of the OFDM frame corresponding to the end regions α1 and α2. The separating means 40 outputs the demodulated signal of the OFDM frame corresponding to the segment area β to the segment area deframing means 41. Further, the separating means 40 outputs the demodulated signals of the OFDM frames corresponding to the end areas α1 and α2 to the end area deframe forming means 42-1.

The segment area deframing means 41 corresponds to the segment area framing means 20 shown in FIG. 1, and receives the demodulated signal of the OFDM frame corresponding to the segment area β from the separating means 40. Then, the segment area deframing unit 41 deframes the demodulated signal of the OFDM frame corresponding to the segment area β. The segment area deframing means 41 generates and outputs a demodulated signal a1' corresponding to the original data carrier a1.

The edge region deframer 42-1 corresponds to the edge region framing unit 21-1 shown in FIG. 1, and receives the demodulated signals of the OFDM frames corresponding to the edge regions α1 and α2 from the separator 40. Then, the edge region deframe conversion means 42-1 deframes the demodulated signal of the OFDM frame corresponding to the edge regions α1 and α2. The end area deframer 42-1 generates and outputs a demodulated signal b1' corresponding to the original data carrier b1.

As described above, according to the OFDM signal receiving apparatus 2-1 of the first embodiment, the broadcast wave of the OFDM signal including the data carrier b1 added to the end regions α1 and α2 in the spectrum mask is received and demodulated. I chose As a result, the band can be expanded to the band width of the spectrum mask with respect to the basic structure of the segment region β of 33 segments. Therefore, it is possible to widen the band of the OFDM signal and improve the transmission rate.

[Example 2]
Next, a second embodiment will be described. As described above, the second embodiment is an example in which the band of the OFDM signal is widened by adding the data carrier and the pilot carrier to the end regions α1 and α2 in the spectrum mask.

FIG. 12 is a diagram illustrating end regions α1 and α2 of the spectrum mask according to the second embodiment. The horizontal axis represents frequency. In the end regions α1 and α2, solid arrows indicate data carriers, and dotted arrows indicate pilot carriers. As shown in FIG. 12, data carriers and pilot carriers are added to the end regions α1 and α2.

For example, when the pilot carriers in the segment region β are arranged at intervals of twelve, the pilot carriers in the end regions α1 and α2 are also arranged at intervals of twelve in order to maintain the same interval in the end regions α1 and α2. Assuming that the carrier interval of the OFDM signal is 0.5 kHz, the band of each of the end region α1 and the end region α2 is 40 Hz, so that 80 data carriers and pilot carriers can be added. In this case, for each of the end regions α1 and α2, a total of 6 sets (72 sets) can be added, with 11 sets of data carriers and 1 set of pilot carriers as one set.

(OFDM signal transmitter/second embodiment)
FIG. 2 is a block diagram illustrating a configuration example of the OFDM signal transmission device according to the second embodiment. The OFDM signal transmission device 1-2 includes a transmission antenna 10, carrier modulation units 11 and 12, a framing unit 13-2, an IFFT unit 14, and a transmission unit 15.

Comparing the OFDM signal transmitting apparatus 1-1 of the first embodiment shown in FIG. 1 with the OFDM signal transmitting apparatus 1-2 of the second embodiment, both OFDM signal transmitting apparatuses 1-1 and 1-2 are carrier-modulated. It is the same in that the units 11 and 12, the IFFT unit 14, and the transmission unit 15 are provided. On the other hand, the OFDM signal transmission device 1-2 is different in that it includes a framing unit 13-2 different from the framing unit 13-1 of the OFDM signal transmission device 1-1. The carrier modulation units 11 and 12, the IFFT unit 14, and the transmission unit 15 have already been described with reference to FIG.

The framing unit 13-2 inputs the data carrier a1 from the carrier modulation unit 11, inputs the data carrier b1 from the carrier modulation unit 12, and inputs the preset pilot carriers a2 and b2. The pilot carrier a2 is a carrier set in the segment region β, and the pilot carrier b2 is a carrier added to the end regions α1 and α2.

The framing unit 13-2 sets the data carrier a1 and the pilot carrier a2 in the band of the segment region β and adds the data carrier b1 and the pilot carrier b2 to the bands of the end regions α1 and α2. Make up the frame. The framing unit 13-2 outputs the OFDM frame signal to the IFFT unit 14.

The framing unit 13-2 includes a segment area framing unit 20, an end area framing unit 21-2, and a synthesizing unit 22. Since the segment area framing means 20 and the synthesizing means 22 have already been described with reference to FIG. 1, description thereof will be omitted here.

The end region framing means 21-2 inputs the data carrier b1 from the carrier modulator 12 and the pilot carrier b2. Then, the end region framing means 21-2 arranges the data carrier b1 and the pilot carrier b2 at predetermined carrier positions and symbol positions so as to add the data carrier b1 and the pilot carrier b2 to the bands of the end regions α1 and α2. Then, the OFDM frames of the end regions α1 and α2 are constructed. The data carrier b1 and the pilot carrier b2 are arranged at predetermined carrier positions and symbol positions to form an OFDM frame of end regions α1 and α2, so that these carriers are transmitted to the end regions α1 and α1 in the spectrum mask by the transmission unit 15. It is transmitted in the α2 band. The edge region framing unit 21-2 outputs the signals of the OFDM frames of the edge regions α1 and α2 to the synthesizing unit 22.

As described above, according to the OFDM signal transmitter 1-2 of the second embodiment, the data carrier b1 and the pilot carrier b2 are added to the end regions α1 and α2 in the spectrum mask. As a result, the same effect as that of the first embodiment is achieved. That is, it becomes possible to widen the band of the OFDM signal and improve the transmission rate. Particularly, since the pilot carrier b2 is added to the end regions α1 and α2, the transmission rate is improved at the position of the data carrier b1 added to the end regions α1 and α2 without deteriorating the estimated value of the transmission path characteristic. It becomes possible.

(OFDM signal receiving device/Example 2)
With reference to FIG. 6, the OFDM signal receiving apparatus 2-2 of the second embodiment includes a receiving antenna 30, a receiving unit 31, an FFT unit 32, a pilot extracting unit 33-2, a channel estimating unit 34-2, a demodulating unit 35, and a demodulating unit 35. The deframing unit 36-2 is provided. The OFDM signal receiving device 2-2 receives the broadcast wave of the OFDM signal transmitted from the OFDM signal transmitting device 1-2 shown in FIG. 2 in the bands of the end regions α1 and α2 and the segment region β shown in FIG. To receive.

The receiving unit 31 corresponds to the transmitting unit 15 illustrated in FIG. 2 and receives the broadcast wave of the OFDM signal from the OFDM signal transmitting apparatus 1-2 via the receiving antenna 30. Then, the receiving unit 31 performs the same processing as that of the first embodiment on the received signal. The FFT unit 32 corresponds to the IFFT unit 14 shown in FIG. 2 and performs the same processing as in the first embodiment.

The pilot extraction unit 33-2 receives the frequency domain signal from the FFT unit 32, and extracts pilot carriers at predetermined carrier positions and symbol positions in the OFDM frame corresponding to the segment region β from the frequency domain signal. The pilot extracting unit 33-2 also extracts pilot carriers at predetermined carrier positions and symbol positions in the OFDM frame corresponding to the end regions α1 and α2. Then, pilot extraction section 33-2 outputs the pilot carrier to channel estimation section 34-2.

The channel estimation unit 34-2 inputs the pilot carrier from the pilot extraction unit 33-2, and estimates the channel characteristic (transmission path characteristic) based on the input pilot carrier and the preset transmission pilot carrier. In this case, the transmission path characteristics of the carrier position and the symbol position of the OFDM frame corresponding to the end regions α1, α2 and the segment region β can be obtained by the interpolation processing and the like.

The demodulation unit 35 performs the same processing as in the first embodiment, and outputs the demodulated frequency domain signal to the deframerization unit 36-2 as a demodulation signal of an OFDM frame.

The deframing unit 36-2 corresponds to the framing unit 13-2 shown in FIG. 2, and receives the demodulation signal of the OFDM frame from the demodulation unit 35. Then, the deframing unit 36-2 deframes the demodulated signal of the OFDM frame to generate a demodulated signal a1′ corresponding to the original data carrier a1 and a demodulated signal b1′ corresponding to the original data carrier b1. The demodulated signals a1' and b1' are output. Then, demodulated data a', b'corresponding to the original data a, b'is obtained from the demodulated signals a1', b1'.

The deframing unit 36-2 includes a separating unit 40, a segment area deframing unit 41, and an end area deframing unit 42-1. The separating means 40 corresponds to the synthesizing means 22 shown in FIG. 2 and performs the same processing as in the first embodiment. The segment area deframing means 41 corresponds to the segment area framing means 20 shown in FIG. 2 and performs the same processing as in the first embodiment to generate a demodulated signal a1′ corresponding to the original data carrier a1. Output.

The edge region deframer 42-1 corresponds to the edge region framing unit 21-2 shown in FIG. 2, and receives the demodulated signal of the OFDM frame corresponding to the edge regions α1 and α2 from the separator 40. Then, the edge region deframe conversion means 42-1 deframes the demodulated signals of the OFDM frames corresponding to the edge regions α1 and α2. The end area deframer 42-1 generates and outputs a demodulated signal b1' corresponding to the original data carrier b1.

As described above, according to the OFDM signal receiving apparatus 2-2 of the second embodiment, the broadcast wave of the OFDM signal including the data carrier b1 and the pilot carrier b2 added to the end regions α1 and α2 in the spectrum mask is received. , I tried to demodulate. As a result, the same effect as that of the first embodiment is achieved. That is, it becomes possible to widen the band of the OFDM signal and improve the transmission rate. In particular, since the pilot carrier b2 is added to the end areas α1 and α2, the estimated value of the transmission path characteristic does not deteriorate at the position of the data carrier b1 added to the end areas α1 and α2, and the transmission rate does not deteriorate. It is possible to improve.

In addition, in the second embodiment, when the data carrier b1 and the pilot carrier b2 are added to the end regions α1 and α2 in the spectrum mask, the pilot carrier b2 is arranged at the same interval as the pilot carrier a2 in the segment region β. I chose On the other hand, the pilot carriers b2 in the end regions α1 and α2 may be arranged at intervals of a predetermined density narrower than the pilot carriers a2 in the segment region β.

In general, the end regions α1 and α2 in the spectrum mask are regions where signals are discontinuous and the reception characteristic deteriorates. However, by making the interval of the pilot carriers b2 narrower than the pilot carrier a2, the reception characteristics are deteriorated. Can be suppressed.

[Example 3]
Next, a third embodiment will be described. As described above, the third embodiment is an example in which the band of the OFDM signal is widened by adding the pilot carriers to the end regions α1 and α2 in the spectrum mask.

(OFDM signal transmitter/third embodiment)
FIG. 3 is a block diagram illustrating a configuration example of the OFDM signal transmission device according to the third embodiment. The OFDM signal transmission device 1-3 includes a transmission antenna 10, a carrier modulation unit 11, a framing unit 13-3, an IFFT unit 14, and a transmission unit 15.

Comparing the OFDM signal transmitting apparatus 1-2 of the second embodiment shown in FIG. 2 with the OFDM signal transmitting apparatus 1-3 of the third embodiment, both OFDM signal transmitting apparatuses 1-2 and 1-3 are carrier-modulated. It is the same in that the unit 11, the IFFT unit 14, and the transmission unit 15 are provided. On the other hand, the OFDM signal transmission device 1-3 does not include the carrier modulation unit 12 of the OFDM signal transmission device 1-2 and is different from the framing unit 13-2 of the OFDM signal transmission device 1-2 in the framing unit 13. -3 is different. The carrier modulator 11, the IFFT unit 14, and the transmitter 15 have already been described with reference to FIG. 1 or FIG.

The framing unit 13-3 inputs the data carrier a1 from the carrier modulation unit 11 and also inputs the preset pilot carriers a2, b2. The pilot carrier a2 is a carrier set in the segment region β, and the pilot carrier b2 is a carrier added to the end regions α1 and α2.

The framing unit 13-3 configures an OFDM frame so that the data carrier a1 and the pilot carrier a2 are set in the band of the segment region β and the pilot carrier b2 is added to the bands of the end regions α1 and α2. .. The framing unit 13-3 outputs the OFDM frame signal to the IFFT unit 14.

The framing unit 13-3 includes a segment area framing unit 20, an end area framing unit 21-3, and a synthesizing unit 22. Since the segment area framing means 20 and the synthesizing means 22 have already been described with reference to FIG. 1 or 2, description thereof will be omitted here.

The end region framing means 21-3 inputs the pilot carrier b2. Then, the end-region framing means 21-3 arranges the pilot carrier b2 at all carrier positions and symbol positions so that the pilot carrier b2 is added to the bands of the end regions α1 and α2, and the end regions α1 and α2 are divided. Construct an OFDM frame. Since the pilot carrier b2 is arranged at all carrier positions and symbol positions to form the OFDM frames of the end regions α1 and α2, these carriers are transmitted to the bands of the end regions α1 and α2 in the spectrum mask by the transmission unit 15. Sent. The end region framing unit 21-3 outputs the signals of the OFDM frames of the end regions α1 and α2 to the combining unit 22.

As described above, according to the OFDM signal transmitter 1-3 of the third embodiment, the pilot carrier b2 is added to the end regions α1 and α2 in the spectrum mask. As a result, the same effects as those of the first and second embodiments are achieved. That is, it becomes possible to widen the band of the OFDM signal and improve the transmission rate.

(OFDM signal receiving device/third embodiment)
FIG. 7 is a block diagram illustrating a configuration example of the OFDM signal receiving apparatus according to the third embodiment. The OFDM signal receiving device 2-3 includes a receiving antenna 30, a receiving unit 31, an FFT unit 32, a pilot extracting unit 33-3, a channel estimating unit 34-3, a demodulating unit 35, and a deframing unit 36-3. There is. The OFDM signal receiving device 2-3 receives the broadcast wave of the OFDM signal transmitted in the bands of the end regions α1 and α2 and the segment region β from the OFDM signal transmitting device 1-3 shown in FIG.

The receiving unit 31 corresponds to the transmitting unit 15 illustrated in FIG. 3 and receives the broadcast wave of the OFDM signal from the OFDM signal transmitting apparatus 1-3 via the receiving antenna 30. Then, the reception unit 31 performs the same process as in the first and second embodiments on the received signal. The FFT unit 32 corresponds to the IFFT unit 14 shown in FIG. 3 and performs the same processing as in the first and second embodiments.

The pilot extraction unit 33-3 inputs the frequency domain signal from the FFT unit 32, and extracts pilot carriers at predetermined carrier positions and symbol positions in the OFDM frame corresponding to the segment region β from the frequency domain signal. The pilot extracting unit 33-3 also extracts pilot carriers at all carrier positions and symbol positions in the OFDM frame corresponding to the end regions α1 and α2. Then, the pilot extraction unit 33-3 outputs the pilot carrier to the channel estimation unit 34-3.

The channel estimation unit 34-3 inputs the pilot carrier from the pilot extraction unit 33-3, and estimates the channel characteristic (transmission path characteristic) based on the input pilot carrier and the preset transmission pilot carrier. In this case, the transmission path characteristics of the carrier position and the symbol position of the OFDM frame corresponding to the end regions α1, α2 and the segment region β can be obtained by the interpolation processing and the like.

The demodulation unit 35 performs the same processing as in the first and second embodiments and outputs the demodulated frequency domain signal to the deframerization unit 36-3 as a demodulation signal of an OFDM frame.

The deframing unit 36-3 corresponds to the framing unit 13-3 illustrated in FIG. 3, and receives the demodulation signal of the OFDM frame from the demodulation unit 35. Then, the deframing unit 36-3 deframes the demodulated signal of the OFDM frame, generates the demodulated signal a1' corresponding to the original data carrier a1, and outputs the demodulated signal a1'. Then, the demodulation data a'corresponding to the original data a is obtained from the demodulation signal a1'.

As described above, according to the OFDM signal receiving apparatus 2-3 of the third embodiment, the broadcast wave of the OFDM signal including the pilot carrier b2 added to the end regions α1 and α2 in the spectrum mask is received and demodulated. I chose As a result, the same effects as those of the first and second embodiments are achieved. That is, it becomes possible to widen the band of the OFDM signal and improve the transmission rate.

In the third embodiment, the pilot carrier b2 is added to the end regions α1 and α2 in the spectrum mask. On the other hand, control signal carriers such as TMCC signals and CP signals may be added to the end regions α1 and α2 instead of the pilot carriers b2. Further, in addition to the pilot carrier b2, control signal carriers such as TMCC signals and CP signals may be added to the end regions α1 and α2.

[Example 4]
Next, a fourth embodiment will be described. As described above, in the fourth embodiment, with respect to the data carriers set in the segment area β and the data carriers added to the end areas α1 and α2 in the first and second embodiments, frequency interleaving or time is applied to all these data carriers. This is an example of applying interleaving.

(OFDM signal transmitter/Example 4)
FIG. 4 is a block diagram illustrating a configuration example of the OFDM signal transmission device according to the fourth embodiment. The OFDM signal transmission device 1-4 includes a transmission antenna 10, carrier modulation units 11 and 12, an interleave unit 16, a framing unit 13-1, an IFFT unit 14, and a transmission unit 15. The OFDM signal transmitting apparatus 1-4 is an example based on the OFDM signal transmitting apparatus 1-1 of the first embodiment shown in FIG. 1, and frequency interleaves or all the data carriers (data carriers a1 and b1). Apply time interleaving.

Comparing the OFDM signal transmitting apparatus 1-1 of the first embodiment shown in FIG. 1 with the OFDM signal transmitting apparatus 1-4 of the fourth embodiment, both OFDM signal transmitting apparatuses 1-1 and 1-4 are carrier-modulated. It is the same in that the units 11 and 12, the framing unit 13-1, the IFFT unit 14 and the transmission unit 15 are provided. On the other hand, the OFDM signal transmission device 1-4 is provided with an interleave unit 16 between the carrier modulation units 11 and 12 and the framing unit 13-1 in addition to the configuration of the OFDM signal transmission device 1-1. It makes a difference. The carrier modulation units 11 and 12, the framing unit 13-1, the IFFT unit 14, and the transmission unit 15 have already been described with reference to FIG.

The interleaver 16 inputs the data carrier a1 from the carrier modulator 11 and the data carrier b1 from the carrier modulator 12. Then, interleaving section 16 performs time interleaving or frequency interleaving on data carriers a1 and b1 in units of all data carriers a1 and b1.

The interleaving unit 16 outputs the interleaved data carrier a1^ corresponding to the input data carrier a1 and the interleaved data carrier b1^ corresponding to the input data carrier b1 to the framing unit 13-1.

The OFDM signal transmitting apparatus 1-4 according to the fourth embodiment has been described above based on the OFDM signal transmitting apparatus 1-1 according to the first embodiment. However, the OFDM signal transmitting apparatus 1-2 according to the second embodiment is assumed as a prerequisite. May be.

As described above, according to the OFDM signal transmitter 1-4 of the fourth embodiment, the data carrier set in the segment area β in the spectrum mask and the data carriers added to the end areas α1, α2 in the first and second embodiments. Therefore, frequency interleaving or time interleaving is applied to all these data carriers. As a result, the reception characteristic can be improved in addition to the effect of widening the band of the OFDM signal and improving the transmission rate, as in the first and second embodiments.

(OFDM signal receiving device/Example 4)
FIG. 8 is a block diagram illustrating a configuration example of the OFDM signal receiving apparatus according to the fourth embodiment. The OFDM signal receiving apparatus 2-4 includes a receiving antenna 30, a receiving unit 31, an FFT unit 32, a pilot extracting unit 33-1, a channel estimating unit 34-1, a demodulating unit 35, a deframing unit 36-1 and a deinterleaver. The unit 37 is provided. The OFDM signal receiving apparatus 2-4 is based on the OFDM signal receiving apparatus 2-1 of the first embodiment shown in FIG. 6, and all demodulated signals (the demodulated signal of the segment area β and the demodulated signals of the end areas α1 and α2). ) Is subjected to frequency deinterleaving or time deinterleaving. The OFDM signal receiving device 2-4 receives the broadcast wave of the OFDM signal transmitted in the bands of the end regions α1 and α2 and the segment region β from the OFDM signal transmitting device 1-4 shown in FIG.

Comparing the OFDM signal receiving apparatus 2-1 of the first embodiment shown in FIG. 6 with the OFDM signal receiving apparatus 2-4 of the fourth embodiment, both OFDM signal receiving apparatuses 2-1 and 1-4 have receiving units. 31, the FFT unit 32, the pilot extraction unit 33-1, the channel estimation unit 34-1, the demodulation unit 35, and the deframing unit 36-1 are the same. On the other hand, the OFDM signal receiving apparatus 2-4 is different in that, in addition to the configuration of the OFDM signal receiving apparatus 2-1, it further includes a deinterleaving unit 37 at a stage subsequent to the deframerization unit 36-1. The receiving unit 31, the FFT unit 32, the pilot extracting unit 33-1, the channel estimating unit 34-1, the demodulating unit 35, and the deframing unit 36-1 have already been described with reference to FIG. To do.

The deinterleaving unit 37 corresponds to the interleaving unit 16 illustrated in FIG. 4, and receives the demodulated signal of the segment region β from the deframing unit 36-1 and the demodulated signals of the end regions α1 and α2. Then, the deinterleaving unit 37 performs reverse processing of time interleaving, that is, time deinterleaving, or reverse processing of frequency interleaving, that is, frequency deinterleaving, on these demodulated signals. The deinterleave unit 37 outputs the demodulated signal after deinterleaving as the demodulated signal a1' corresponding to the data carrier a1 and the demodulated signal b1' corresponding to the data carrier b1.

Although the OFDM signal receiving apparatus 2-4 of the fourth embodiment has been described above based on the OFDM signal receiving apparatus 2-1 of the first embodiment, the OFDM signal receiving apparatus 2-2 of the second embodiment is assumed to be used. May be.

As described above, according to the OFDM signal receiving apparatus 2-4 of the fourth embodiment, the data carrier set in the segment area β in the spectrum mask and the end areas α1 and α2 in the first and second embodiments are added. A broadcast wave of an OFDM signal including a data carrier is received, demodulated, and all these demodulated signals are subjected to time deinterleaving or frequency deinterleaving. As a result, the reception characteristic can be improved in addition to the effect of widening the band of the OFDM signal and improving the transmission rate, as in the first and second embodiments.

In the fourth embodiment, time interleaving or frequency interleaving is performed on all data carriers, but both time interleaving and frequency interleaving may be performed. In this case, interleaving section 16 of OFDM signal transmitting apparatus 1-4 may perform frequency interleaving after performing time interleaving, or may perform time interleaving after performing frequency interleaving. .. In the former case, the deinterleaving unit 37 of the OFDM signal receiving device 2-4 performs frequency deinterleaving and then time deinterleaving, and in the latter case, it performs time deinterleaving and then frequency deinterleaving.

[Example 5]
Next, a fifth embodiment will be described. As described above, the fifth embodiment is an example in which band information such as information about the segment region β and information about the end regions α1 and α2 is included in the TMCC signal and transmitted and received in the first to fourth embodiments.

(OFDM signal transmitter/fifth embodiment)
FIG. 5 is a block diagram illustrating a configuration example of the OFDM signal transmission device of the fifth embodiment. The OFDM signal transmission device 1-5 further includes a TMCC generation unit 17 in addition to the configuration of any one of the first to fourth embodiments. The solid line and the dotted line showing the flow of the components and the data in FIG. 5 are distinguished from each other for convenience in order to represent Examples 1 to 4 in one figure. Dotted line components and data flow indicate that some embodiments do not exist. The framing units 13-1 to 13-3 are collectively referred to as the framing unit 13, and the framing unit 13 performs framing including the TMCC signal according to the band information included in the TMCC signal.

The carrier modulation units 11 and 12, the framing unit 13, the IFFT unit 14, the transmission unit 15, and the interleaving unit 16 have already been described, so description thereof will be omitted here.

The TMCC generator 17 generates a TMCC signal by modulating the band information such as the information about the segment region β and the information about the end regions α1 and α2 shown in FIGS. 10 to 12. Then, the TMCC generator 17 outputs the TMCC signal including the band information to the framing unit 13.

The information on the segment area β includes, for example, the bandwidth of the segment area β, the data carrier set in the segment area β, the carrier position and symbol position of the pilot carrier and the control signal carrier, and the carrier type. The information on the end regions α1 and α2 includes carrier positions and symbol positions of data carriers, pilot carriers, control signal carriers, and the like added to the end regions α1 and α2, and carrier types.

By using such a TMCC signal, the OFDM signal receiving apparatus 2-5 described later determines the type and position of the carrier added to the end regions α1 and α2 from the band information included in the TMCC signal. be able to. Therefore, the forms of Examples 1 to 4 can be distinguished. This makes it possible to flexibly change the bandwidth of the OFDM signal according to the spectrum mask of each country and add a desired carrier.

The framing unit 13 inputs the data carrier a1 (for example, the interleaved data carrier a1^ in the case of the fourth embodiment) and the like, and inputs the TMCC signal including the band information from the TMCC generation unit 17. Then, the framing unit 13 sets the TMCC signal to the band of the segment area β in addition to the data carrier a1 and the like according to the band information included in the TMCC signal, and the data carrier b1 and the like (for example, in the case of the third embodiment). Configures an OFDM frame so that the pilot carrier b2) is added to the bands of the end regions α1 and α2. The framing unit 13 outputs the OFDM frame signal to the IFFT unit 14.

When the framing unit 13 is premised on the configuration of the OFDM signal transmitting apparatus 1-3 shown in FIG. 3, the end region framing unit 21-3 provided in the framing unit 13 is provided with the pilot carrier b2. Alternatively, the TMCC signal including the band information may be input from the TMCC generator 17. In this case, the segment area framing unit 20 of the framing unit 13 configures the OFDM frame of the segment area β so that the data carrier a1 and the like are set in the band of the segment area β, and the end area framing unit 21-3. Configures an OFDM frame of the end regions α1 and α2 so as to add this TMCC signal to the bands of the end regions α1 and α2.

As described above, according to the OFDM signal transmitting apparatus 1-5 of the fifth embodiment, in the first to fourth embodiments, the band information such as the information about the segment region β and the information about the end regions α1 and α2 is included in the TMCC signal. I tried to send it. As a result, similarly to the first to fourth embodiments, it is possible to widen the band of the OFDM signal and improve the transmission rate. In addition, the bandwidth of the OFDM signal can be flexibly changed according to the spectrum mask of each country, or a desired carrier can be added, and the spectrum mask can be applied to different spectrum masks in each country.

(OFDM signal receiving device/fifth embodiment)
FIG. 9 is a block diagram showing a configuration example of the OFDM signal receiving apparatus of the fifth embodiment. This OFDM signal receiving device 2-5 further includes a TMCC extraction section 38 and a TMCC demodulation section 39 in addition to the configuration of any of the first to fourth embodiments. The solid line and the dotted line showing the flow of the components and the data in FIG. 9 are distinguished from each other for convenience in order to represent Examples 1 to 4 in one figure. Dotted line components and data flow indicate that some embodiments do not exist.

The pilot extraction units 33-1 to 33-3 are collectively referred to as the pilot extraction unit 33, the channel estimation units 34-1 to 34-3 are collectively referred to as the channel estimation unit 34, and the deframe conversion units 36-1 to 36-. 3 is generically referred to as a deframer 36. The deframing unit 36 deframes corresponding to the framing unit 13 illustrated in FIG. 5 according to the band information extracted from the TMCC signal.

The receiving unit 31, the FFT unit 32, the pilot extracting unit 33, the channel estimating unit 34, the demodulating unit 35, and the deinterleaving unit 37 have already been described, so description thereof will be omitted here. The pilot extraction unit 33 inputs the pilot position from the TMCC demodulation unit 39, which will be described later, and extracts the pilot carrier at the pilot position from the signal in the frequency domain.

The TMCC extraction unit 38 inputs the frequency domain signal from the FFT unit 32, extracts a TMCC signal including band information from the frequency domain signal, and outputs the TMCC signal to the TMCC demodulation unit 39.

The TMCC demodulation unit 39 inputs the TMCC signal from the TMCC extraction unit 38 and demodulates the TMCC signal to generate band information. As described above, the band information includes information about the segment area β, information about the end areas α1 and α2, and the like.

The TMCC demodulator 39 outputs the band information to the deframer 36 and outputs the pilot carrier position to the pilot extractor 33 as the pilot position.

The deframing unit 36 inputs the demodulation signal of the OFDM frame from the demodulation unit 35 and the band information from the TMCC demodulation unit 39. Then, the deframing unit 36 deframes the demodulated signal of the OFDM frame according to the band information to generate a demodulated signal a1′ corresponding to the original data carrier a1 and a demodulated signal b1′ corresponding to the original data carrier b1. Then, demodulated signals a1' and b1' are output.

Note that, assuming the configuration of the OFDM signal receiving apparatus 2-3 shown in FIG. 7, the deframing unit 36 generates only the demodulated signal a1′ corresponding to the original data carrier a1 and the demodulated signal a1′. Is output.

By using such a TMCC signal, it is possible to determine the type and position of the carrier added to the end regions α1 and α2 from the band information included in the TMCC signal. Can be distinguished. By this means, it is possible to receive an OFDM signal whose bandwidth is flexibly changed according to the spectrum mask of each country and to receive an OFDM signal to which a desired carrier has been added.

As described above, according to the OFDM signal receiving apparatus 2-5 of the fifth embodiment, in the first to fourth embodiments, the TMCC signal including the band information such as the information about the segment region β and the information about the end regions α1 and α2 is received. I decided to do it. As a result, similarly to the first to fourth embodiments, it is possible to widen the band of the OFDM signal and improve the transmission rate, and in addition, it is possible to apply it to different spectrum masks in each country.

Although the present invention has been described above with reference to the first to fifth embodiments, the present invention is not limited to the first to fifth embodiments, and various modifications can be made without departing from the technical idea thereof. For example, the present invention is applicable not only when the bandwidth per channel is 6 MHz, but also when it is 7 MHz, 8 MHz, or the like.

Further, in the first to fifth embodiments, the transmitting side is provided with one transmitting antenna 10 and the receiving side is also provided with one receiving antenna 30. On the other hand, the present invention is also applicable to a MIMO (Multiple Input Multiple Output) transmission system in which a transmitting side has a plurality of transmitting antennas and a receiving side also has a plurality of receiving antennas. In this case, the OFDM signal transmission device on the transmission side is provided with a plurality of transmission systems shown in FIGS. 1 to 5 corresponding to the plurality of transmission antennas. The OFDM signal receiving apparatus on the receiving side performs MIMO demodulation on the respective received signals received via the plurality of receiving antennas.

DESCRIPTION OF SYMBOLS 1 OFDM signal transmitter 2 OFDM signal receiver 10 Transmission antennas 11 and 12 Carrier modulator 13 Framer 14 IFFT unit 15 Transmitter 16 Interleaver 17 TMCC generator 20 Segment area framing means 21 End area framing means 22 Composite Means 30 receiving antenna 31 receiving section 32 FFT section 33 pilot extracting section 34 channel estimating section 35 demodulating section 36 deframing section 37 deinterleaving section 38 TMCC extracting section 39 TMCC demodulating section 40 separating means 41 segment area deframing means 42 end Area deframer

Claims (4)

In an OFDM signal transmission device that transmits an OFDM signal in a band of a spectrum mask including a segment area of a segment structure,
Inputting first data transmitted in the band of the segment area in the spectrum mask, modulating the first data to generate a first data carrier, and
The second data carrier is a region other than the segment region in the spectrum mask, the second data transmitted in the band of the end region of the spectrum mask is input, and the second data is modulated to generate a second data carrier. A carrier modulation unit for generating
The second data carrier generated by the carrier modulation unit so that the first data carrier generated by the carrier modulation unit and the preset first pilot carrier are set in the segment area. and a second pilot carriers pre Me set to append to the end region, and a framing unit for forming an OFDM frame,
An IFFT unit that IFFTs the OFDM frame signal configured by the framing unit and converts the frequency domain signal into a time domain signal;
The time domain signal converted by the IFFT unit, in a band of the spectrum mask including the segment region and the end region, via a transmission antenna, a transmission unit for transmitting the OFDM signal ,
The framing unit is
An OFDM signal transmitting apparatus , wherein the second pilot carriers in the end area are arranged at intervals of a predetermined density narrower than that of the first pilot carriers in the segment area . The OFDM signal transmitting apparatus according to claim 1 ,
Equipped with multiple transmit antennas,
An OFDM signal transmitting apparatus that constitutes a MIMO transmission system with an OFDM signal receiving apparatus that receives the OFDM signal transmitted via the plurality of transmitting antennas. In an OFDM signal receiving device for receiving an OFDM signal in a band of a spectrum mask including a segment area of a segment structure,
A receiving unit that receives the OFDM signal via a receiving antenna in the band of the spectrum mask including the segment region and a region other than the segment region in the spectrum mask and including an end region of the spectrum mask, and ,
An FFT unit for performing FFT on the OFDM signal received by the receiving unit and converting the time domain signal into a frequency domain signal;
From said signal converting said frequency regions by the FFT unit, extracts the first pilot carriers is set to the segment region, a second pilot carrier is added to the end region, the segment region A pilot extracting unit for extracting the second pilot carriers arranged at intervals of a predetermined density narrower than the first pilot carrier ,
A channel for estimating channel characteristics at each position of an OFDM frame corresponding to the segment area and the end area based on the first pilot carrier and the second pilot carrier extracted by the pilot extracting unit An estimation section,
The frequency domain signal converted by the FFT unit is demodulated using the transmission path characteristic estimated by the channel estimation unit, and added to the first data carrier and the end region set in the segment region. A demodulation unit for generating a demodulation signal of an OFDM frame corresponding to the second data carrier;
A first demodulation signal corresponding to the original first data carrier in the OFDM signal transmission apparatus that de-framed the demodulation signal of the OFDM frame generated by the demodulation unit and transmitted the OFDM signal, and the OFDM signal transmission A deframer for generating a second demodulated signal corresponding to the original second data carrier in the device;
An OFDM signal receiving apparatus comprising: The OFDM signal receiving apparatus according to claim 3 ,
Equipped with multiple receiving antennas,
An OFDM signal reception device that constitutes a MIMO transmission system with an OFDM signal transmission device that transmits the OFDM signal via a plurality of transmission antennas.

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