WO2006112133A1 - Wireless transmitter and wireless communication system - Google Patents

Wireless transmitter and wireless communication system Download PDF

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Publication number
WO2006112133A1
WO2006112133A1 PCT/JP2006/303051 JP2006303051W WO2006112133A1 WO 2006112133 A1 WO2006112133 A1 WO 2006112133A1 JP 2006303051 W JP2006303051 W JP 2006303051W WO 2006112133 A1 WO2006112133 A1 WO 2006112133A1
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WO
WIPO (PCT)
Prior art keywords
value
propagation path
number
sub
subcarrier
Prior art date
Application number
PCT/JP2006/303051
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French (fr)
Japanese (ja)
Inventor
Yasuyuki Kato
Original Assignee
Sharp Kabushiki Kaisha
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Priority to JP2005111904 priority Critical
Priority to JP2005-111904 priority
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2006112133A1 publication Critical patent/WO2006112133A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference induced by transmission
    • H04B1/1027Means associated with receiver for limiting or suppressing noise or interference induced by transmission assessing signal quality or detecting noise/interference for the received signal

Abstract

[PROBLEMS] To improve transmission efficiency on a link for informing propagation path information, while suppressing generation of an error during communication. [MEANS FOR SOLVING PROBLEMS] A wireless transmitter is provided with an SIR estimating section (207) for estimating a reception SIR from a wireless signal received from the other party of communication; an SIR information creating section (210) for creating wireless propagation path information wherein a reception SIR value of a specified subcarrier is decimated in accordance with the estimation results of the SIR estimating section (207); and an upstream link transmission processing section (211) for transmitting the wireless propagation path information created by the SIR information creating section (210) to the other party of communication. The SIR information creating section (210) creates the wireless propagation path information only from the reception SIR values for every prescribed number of subcarriers, a number of the subcarrier having the largest error compared with an actual reception SIR value and the reception SIR value.

Description

Wireless transmitter and a wireless communication system

Technical field

[0001] The present invention is based on the radio channel conditions on the receiver side, Ru with this wireless transmitter and performing high-speed communication adaptively changing the modulation scheme, etc. and the coding rate for each sub-carrier wireless It relates to a communication system.

BACKGROUND

[0002] Currently, the high-speed mobile communications, the radio base station (hereinafter, referred to as "base station".) And the non-linear mobile station (hereinafter, referred to as "mobile station".) And the radio propagation path between the modulation scheme and the coding rate according to the state (MCS: modulation and code scheme) enhance the transmission efficiency by controlling, and adaptive modulation scheme to provide communication of the high-throughput, radio from the radio channel state for each user good subcarriers of the propagation path state is performed research and development of OFDMA scheme to perform high-speed communication by assigning to each user! / Ru.

[0003] and communication method adaptively modulated by such a radio channel state for each subcarrier, the communication method of assigning subcarriers to each user by the radio channel conditions, the base station, each sub-by radio propagation path state to change the modulation scheme and coding I 匕率 the carrier, or to grasp the situation, such as reception power of each subcarrier received by the mobile station to allocate a good sub-carrier of the radio propagation path state to the user There is a need. Hand, the mobile station, reception SIR (signal power to interference power ratio: Signal to Interference Po wer Ratio) measure the radio channel conditions such as, the reception SIR information of all subcarriers measured by the mobile station digitizes Ru and transmitted periodically to the base station side Te.

[0004] Specifically, the base station, as shown in FIG. 21, and transmits a signal to a predetermined transmission power for each subcarrier to the mobile station. At the point of the mobile station, signals transmitted from the way the base station, as shown in FIG. 22, the signal is attenuated for each affected by connexion Sabukiya rear such as frequency fading. The mobile station calculates a received SIR of all subcarriers from a known signal (pilot signal) contained in the frame, and transmits the calculated reception SIR information of all subcarriers to periodically base station digitized. The base station, the reception SIR information received or the mobile station, for example, to determine the modulation scheme and coding rate for each subcarrier based on the set threshold as in FIG. 23, and transmits the data to the mobile station Te! / Ru.

[0005] Furthermore, when transmitting the reception SIR information of all subcarriers measured by the mobile station to the base station side, to indicate that the amount of information reduced surgical tools 24, a subcarrier group for each N present M pieces to Bro Kkui spoon, calculates the average value of the reception SIR of subcarriers in each block, a method of notifying the average value of each block to the base station has been proposed (e.g., see non-Patent Document 1) . Non-Patent Document 1: Kazunari Yokomakura, Masakazu Sanpei, Morinaga Norihiko, "Estimation and notification technique of the interference power in one cell repetition OFDMZTDMA system using the adaptive modulation scheme", IEICE IEICE RCS2003 -. 240 p 33- 38, disclosure of the 2003 invention

Problems that the Invention is to you'll solve

While [0006] is the force, the radio propagation path information of such conventional receiving SIR, since the amount of information of several bit with respect to per sub-carrier is allocated, the reception SIR according to the number of sub-carriers there is a problem that the amount of information is increased. Currently, many communication systems adaptive modulation schemes have been considered, several hundred to have decided to use the sub-carrier, a few kilometers bit in order to send the reception SIR of the number fraction corresponding thereto and thus requiring a wireless propagation information amount. Also, for changing the periodic modulation scheme in the adaptive modulation scheme, the mobile station must inform the channel information to periodically base station in accordance with the period of the base station. For this reason, the proportion tag information transmission efficiency of the propagation path information is bad like on purpose in the uplink. Furthermore, such a heat transmission rate of the uplink of the mobile station power in a communication system also to the base station is the transmission rate in the base station power is also compared with the downlink to the mobile station is lower communication system is assumed, because, and summer and causes the transmission efficiency becomes worse, Ru.

[0007] In the method disclosed in Non-Patent Document 1, there is good subcarriers and bad subcarriers radio conditions in the interior of the sub-carrier group that has been blocked. Therefore, when these averaging to, as shown in FIG. 25, not selected high modulation scheme modulation factor is relative good subcarriers radio condition, situation and the transmission efficiency is deteriorated, conversely radio conditions causing a so error high modulation scheme modulation factor is selected for poor subkey Yaria increases, the optimal modulation scheme can not be selected for the sub-carrier, the transmission efficiency is a problem with that decrease.

[0008] The present invention has been made in view of such conventional problems, while suppressing the occurrence of errors during communication, to improve the transmission efficiency on the link to notify the channel information and an object thereof is but to provide a wireless transmitter and a wireless communication system having the same that can be. Means for Solving the Problems

[0009] (1) To achieve the above object, the present invention took measures as described below. That is, the radio transmitter according to the present invention includes a propagation path condition estimating unit that estimates a channel state from a radio signal received from the communication partner, a specific sub-carrier according to the estimated result of the propagation path condition estimating unit further comprising a channel information creation unit that creates a channel information obtained by thinning a value that indicates propagation path condition of, and a transmission processing unit for transmitting the channel information created by the channel information generation unit to the communication partner It is characterized in.

[0010] Thus, since creating a channel information obtained by subtracting between the value indicating the channel status of a particular sub-carrier in the channel information creation unit, notification of the value indicating the channel status of all subcarriers possible to improve the transmission efficiency on the link for notifying the propagation path information in comparison with the case where become.

[0011] The (2), in the radio transmitter according to the present invention, the channel information creation section includes a value indicating the channel state for subcarriers selected for each predetermined this number, contact next is the selected creating only force propagation path information of the subcarrier number and indicates to value the channel conditions having a value indicative of the most error is large propagation condition linearly interpolated value from the value indicating the channel state for subcarriers It is characterized in.

[0012] Thus, the most error value indicating the propagation path condition, the linear interpolated value from the value indicating the channel state for subcarriers adjacent the selected for the subcarrier that is selected for each predetermined number since the channel information is created from the values ​​and only showing a propagation path condition of the sub-carrier number and its, to notify a value indicating the channel status of all Sabukiyari § and having a value indicating a large propagation condition transmission efficiency on the link for notifying the propagation path information than can be improved. Further, since the value indicating the highest subcarrier number and its channel condition error is notified, For example based on the information in the communication partner, it is possible to modify the modulation scheme 'coding rate. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress erroneous Rino occurrence during communication.

[0013] (3) In addition, our in a radio transmitter according to the present invention !, Te, the channel information creation section, the slope of the curve obtained by connecting the value indicating the propagation path condition of each subcarrier in advance Ru is characterized in that from only the sub-carrier number and a value indicating the propagation path condition when the changed more than a certain value determined to create a propagation path information.

[0014] Thus, a value indicating a subcarrier number and a channel state when the slope of the curve obtained by connecting the value indicating the propagation path condition of each subcarrier is changed a predetermined certain value or more only since the channel information is created from, it is possible to significantly reduce the radio channel information amount as compared with the case of notifying the value indicating the channel status of all sub-carriers, on the link for notifying the propagation path information it is possible to improve the transmission efficiency. Further, since the value indicating the channel state between the sub-carrier number when the slope of the curve has changed more than a predetermined value is notified, it shows the actual channel conditions that significantly deviate the value indicating the propagation path condition value There can be prevented from being notified. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress erroneous Rino occurrence during communication.

[0015] (4) In addition, our in a radio transmitter according to the present invention !, Te, the channel information creation section, the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each sub-carrier It is characterized in that to create only the force propagation path information of the subcarrier number and the value indicating the propagation path condition when made into varying, Ru.

[0016] Thus, the sub-carrier number and value and only force propagation path information indicating the propagation path condition when the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each subcarrier is changed because There is created, as compared with the case of notifying the value indicating the channel status of all sub-carriers can be greatly reduced radio channel information amount, transmission efficiency on the link for notifying the propagation path information it is possible to improve the. Moreover, the value indicating the subcarrier number and the channel conditions when the slope of the curve is reversed is notified, a value indicating the propagation path condition that deviated significantly from the value indicating an actual channel state notification it is the can be prevented. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible and this suppresses the occurrence of errors in communication.

[0017] The (5), contact the wireless transmitter according to the present invention !, Te, the channel information creation section, the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each sub-carrier a value indicating the subcarrier number and its channel conditions when is turned into strange, propagated from only the values ​​indicating the channel state for subcarriers sign of the slope of the curve is located midway between subcarrier numbers have changed It is characterized in that to create the road information.

[0018] Thus, the value indicating the subcarrier number and its channel conditions when the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each subcarrier is changed, the slope of the curve since code channel information from only the values ​​indicating the propagation path condition with respect subkey Yaria disposed midway between subcarrier numbers that change in is created, when notifying a value indicating the channel status of all subcarriers it can be significantly can reduce the radio propagation path information amount, improves the transmission efficiency on the link for notifying the propagation path information in comparison with. Further, since the value indicating the subcarrier number and the channel conditions when the slope of the curve is reversed is notified, a value indicating the propagation path condition that deviated significantly from the value indicating an actual channel state is notified that can be prevented. Thus, the modulation scheme and the like that do not conform to the radio state is selected, as it can avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication. Furthermore, since the shown to value the channel state of subcarriers positioned midway between subcarrier numbers of inclination is reversed in the curve is notified, the communication destination based on these information, for example, the modulation scheme ' it is possible to modify the coding rate. Thus, it is possible to select compatible modulation schemes such as more radio conditions, it is possible to further suppress the occurrence of errors in communication.

[0019] The (6), contact the wireless transmitter according to the present invention !, Te, the channel information creation section, the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each sub-carrier subkey Yaria number only a force transmission path having a value indicative of the value indicating the subcarrier number and channel conditions in the case where the ized variations, the intermediate channel state of the inter-subcarrier number sign of the slope of the curve changes It is characterized in that to create the information.

[0020] Thus, the value indicating the subcarrier number and its channel conditions when the sign of the slope of the curve obtained by connecting the value indicating the propagation path condition of each subcarrier is changed, the slope of the curve since subcarrier numbers only force channel information has a value indicating an intermediate propagation path condition of the inter-subcarrier number code has changed in is created, and the case of notifying a value indicating the channel status of all Sabukiya rear compared able to decrease drastically cut the radio channel information amount, Ru can improve the transmission efficiency on the link for notifying the propagation path information. Further, since the value indicating the subcarrier number and the channel-like situation where the inclination is reversed in the curve is notified, a value indicating the propagation path condition that deviated significantly from the value indicating an actual channel state notification it is the can be prevented. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication. Further, since the sub-carrier number that have a value that indicates the intermediate propagation path condition of between a value indicating the channel state of the subcarrier numbers inclination is reversed in the curve is notified, the communication based on the information a destination for example, it is possible to modify the modulation scheme 'coding rate. Thus, it is possible to choose a more compatible modulation schemes such as the radio conditions, it is possible to further suppress the occurrence of errors in communication.

[0021] The (7), contact the wireless transmitter according to the present invention !, Te, the channel information creation unit, the channel information to select the manner in which data amount of the heat transfer 搬路 information is minimized It is characterized in and create your.

[0022] Thus, channel information creation unit, so to create a selected said channel information data amount smallest towards expression of the propagation path information, Ru can be improved the most transmission efficiency it is possible to notify the channel information to select the method to the communication partner.

[0023] The (8), contact the wireless transmitter according to the present invention, Te, the propagation path condition estimating unit reception SIR as the propagation path state!: The (Signal to Interference Power Ratio signal power to interference power ratio) Ru Featuring be estimated.

[0024] The (9), contact the wireless transmitter according to the present invention, Te, the propagation path condition estimating unit receives SNR as channel state!: The (Signal to Noise Power Ratio signal power to noise power ratio) as characterized by estimating, Ru.

[0025] The (10), in the radio transmitter according to the present invention, the propagation path condition estimating unit receives SINR as the propagation path state (Signal to Interference Plus Noise Power Ratio

: It is characterized by estimating the signal power to interference noise power ratio).

[0026] As these, as the propagation path state propagation path condition estimating unit, reception SIR, since estimates the received SNR and received SINR, it can be estimated appropriately channel conditions.

[0027] The (11), the mobile station apparatus according to the present invention, as characterized in that it comprises a radio transmitter mounting serial to any one of claims 1 to 10, Ru.

[0028] Thus, the mobile station apparatus provided with the above-mentioned radio transmitters, from Rukoto, on the link for notifying the propagation path information in comparison with the case of notifying the value indicating the channel status of all Sabukiyari § it becomes possible to improve transmission efficiency, it is possible to obtain also in the mobile station apparatus obtained that effects the wireless transmitter according to the claims.

[0029] The (12), the base station apparatus according to the present invention, as characterized in that it comprises a radio transmitter mounting serial to any one of claims 1 to 10, Ru.

[0030] Thus, the base station apparatus equipped with the radio transmitter, the Rukoto, on the link for notifying the propagation path information in comparison with the case of notifying the value indicating the channel status of all Sabukiyari § it becomes possible to improve transmission efficiency, it is possible to obtain also in the base station apparatus obtained that effects the wireless transmitter according to the claims.

[0031] The (13), a wireless communication system according to the present invention, sub-utilizes the mobile station apparatus according, the channel information received from the mobile station apparatus to claim 10 claims 8 is characterized by comprising a base station apparatus determines a modulation scheme and a code I 匕率 for each carrier, a.

[0032] Thus, since the radio communication system comprises a mobile station apparatus according to any one of claims 10 claim 8, the radio communication system odor, the value indicating the propagation path like status of all sub-carrier be on the transmission efficiency on the link for notifying the propagation path information in comparison with the case of notifying direction is Ka會.

Effect of the invention

According [0033] to a wireless transmitter and a wireless communication system according to the present invention, while suppressing the occurrence of errors during communication, carrying out the invention that can improve the transmission efficiency on the link to notify the channel information bEST mODE fOR

[0034] Hereinafter, Tsu to an embodiment of the radio communication system according to the present invention will be specifically described with reference to the drawings Te.

[0035] Figure 1, the base station apparatus (hereinafter, referred to. As "base station") included in the wireless communication system according to an embodiment of the present invention is a block diagram showing a 100 configuration. Also, FIG. 2, the mobile station apparatus constituting the communication system according to the embodiment of the present onset Ming embodiment (hereinafter, referred to. As "mobile station") is a block diagram showing a 200 configuration.

[0036] In base station 100 shown in FIG. 1, the encoding unit 101, an instruction from the MCS assignment section described later Te, use an encoding scheme such as turbo coding on transmission data that is generated by an external device performing encoding of the data in the encoding rate. The data modulation unit 102 performs modulation processing in accordance with the modulation scheme instructed MCS assignment section force will be described later with respect to the encoding unit 101 or these code I spoon data. Serial Z-parallel converter (SZP conversion unit) 103, a modulation data from the data modulator 102 in series Z parallel conversion, and converts the parallel processed modulated data in accordance with the number of sub-carriers.

[0037] The multiplexing unit (Mux part) 104, a modulation data in parallel converted into the number of subcarriers, Bruno Irotto signal for the mobile station 200 estimates the received SIR, each sub from MLI generating unit 111 to be described later carrier modulation method, modulation and coding I arsenide information code I arsenide rate marked (MLI: Multile vel information) and multiplexes. Note that the pilot signal to be used in the multiplexing is passed from the pilot generating unit 105 at a predetermined timing. Inverse fast Fourier transform unit (IFFT unit) 106 performs inverse Fourier transform on the multiplexed data from Mux unit 104, and converts the OFDM signal. Radio transmitting section 107 up Compur preparative OFDM signal into a radio frequency band, and transmits to the mobile station by the transmission power of each subcarrier constant.

[0038] uplink reception processing unit 108 receives data from the mobile station 200, to separate the reception SIR information estimated by the received data and the moving station. Received data is sent to the external device, receiving SIR information is sent to the SIR information extracting section 109. The receiving mode of the demodulation unit in the base station 100, it 's Chikarama without those necessarily with the capability of adaptive modulation reception.

[0039] SIR information extracting section 109, to extract the thinning information including the uplink reception SIR information or we received from the reception processing unit 108, a subcarrier number and the SIR values ​​sent from the mobile station 200. Further, the thinning information force also by linear interpolation between specified reception SIR value, and calculates the SIR value of the sub-carriers thinned by the mobile station 200 side. Furthermore, it sends the received SIR values ​​of all subcarriers in MCS assignment section 110.

[0040] MCS assignment section 110 determines the MC S of each subcarrier from the SIR value of each subcarrier calculated, respectively numerals 匕率 to the code I radical 21 101 and data modulator 102 and to indicate the modulation scheme. Moreover, passing the current MCS information in each sub-carrier of the MLI generating unit 111. MLI generating unit 111 assembles the MCS information of each subcarrier, a modulation scheme in which the mobile station 200 can receive in any environment, no line modulation and coding with the coding rate, and passes the MLI generated in Mux 104 .

[0041] The modulation scheme and coding I 匕率 performed in MLI generating unit 111 is determined in advance between the base station 100 and moves Dokyoku 200, the method or the like is fixed. Further, MLI, since the mobile station 200 must also be received in any environment, low modulation multivalue number as possible (BPSK, QPSK, etc.), having a low code I 匕率 is desirable.

[0042] On the other hand, in mobile station 200 shown in FIG. 2, the radio receiving section 201 receives a non-linear signal from the base station 100, down-converts the radio signal of the radio frequency band to the IF frequency band. The fast Fourier transform unit (FFT unit) 202 performs Fourier transform to return the OFDM signal to the modulation data. DeMux 203 separates the modulated data multiplexed, and sends the modulated data parallel Z-serial conversion unit (PZS conversion unit) 204, MLI MLI extraction unit 206, a pilot signal to the SIR estimation section 207.

[0043] parallel Z-serial converter (PZS conversion unit) 204, a modulation data parallelism to the number of subcarriers in parallel Z-serial conversion back to one row of modulation data and sends the data demodulator 205. Data demodulator 205 demodulates the modulated data demodulation scheme which is instructed according to the instructions of the MCS controller 209 to be described later modulated data back into encoded data. Decoding unit 208 decodes I spoon at the indicated method according to the instructions of the MCS controller 209 to be described later marks Goi匕 data, back to the original data.

[0044] MLI extraction unit 206, the modulation made to MLI in the base station 100, demodulation to return the coding method, performs decoding processing, and sends the MLI data to the MCS controller 209. MCS control section 209 performs a determination of MCS of each subcarrier from the MLI data, it controls the data demodulation section 205 and decoding I radical 21 208.

[0045] SIR estimation section 207, pilot signal power also estimates the received SIR of each subcarrier. At this time, the estimated received SIR is a SIR that is smooth I匕 between subcarriers. SIR information creation section 210, a received SIR value of each subcarrier from the SIR estimation section 207, to create a SIR information to be transmitted to the base station 100 using Mayumi I-out algorithm to be described later, transmission uplink signal processing unit and passes to 211. Uplink transmission processing unit 211, the SIR information and transmission data are multiplexed, transmitted to the base station 100 in the radio signal.

[0046] The receiving side of the base station 100, and, with respect to the communication control of the uplink link of the transmitting side in the mobile station 200, in particular, may be not those using adaptive modulation control.

[0047] In the communication system according to the present embodiment, when transmitting the reception SIR information at all subcarriers measured by the mobile station 100 to the base station 100, by thinning out the received SIR value of a particular sub-carrier it is intended to avoid an increase of errors in drop or communication of transmission efficiency that may occur by not notifying the received SI R values ​​of all subcarriers while reducing the information amount. Hereinafter, the algorithm to use when decimating the received SIR value in the specific sub-carrier (hereinafter referred to as "thinning algorithm".) Will be described.

[0048] In the above decimation algorithm is used when SIR information creation section 210 in the mobile station 200 creates a SIR information to be transmitted to the base station 1 00. SIR information creation section 210, mosquitoes used alone decimation algorithm shown below ゝ, or can be used by switching in accordance with the situation such as an error in the radio channel. The following describes first to fifth thinning algorithm used by the SIR information producing portion 210.

[0049] First, a description will be given of a first decimation algorithm. First decimating algorithm, the value indicated straight line that connects the receiving SIR values ​​between the reception SIR value of the sub-carrier for each m this, the actual highest subcarrier number and the reception SIR value error between the reception SIR value it is intended to be detected. By notifying only the received SIR value of the sub-carrier of the sub-carrier and m each book of the detected subcarrier number to the base station 100, in which thin out the reception SIR value of the other sub-carriers as a result.

[0050] FIG. 3 is a diagram for explaining the outline of the first thinning algorithm. 4 is a flow chart for explaining a first decimating algorithm. Further, FIG. 5 is a diagram showing an example of a frame format used to notify use the first thinning algorithm, the receiving SIR value of the sub-carrier identified Te to the base station 100.

[0051] In the first thinning algorithm, as shown in FIG. 3, after extracting the reception SIR value of the sub-carrier for each m present (in FIG. 3 ten per) linearly interpolating between each received SIR value (indicative of linear interpolated values ​​by the dotted line). Then, it calculates a difference between the actual reception SIR value and linear interpolation value, to extract the error is the largest sub-carrier number and a reception SIR value.

[0052] The frame format used in the notification to the base station 100, and reception SIR value of the sub-carrier of each the m, and the subcarrier number and the reception SIR value to be m Honma of maximum error is describe . Using the example shown in FIG. 3, in between the first and 11 th subcarrier, as the actual highest subcarrier number and the reception SIR value and the error of the reception SIR value, 5 th subcarrier number and the reception SIR value is to be notified.

[0053] The specific algorithm, as shown in FIG. 4, first, the reference number i is initialized (i = 0) (step SI), the reception SIR value of the first sub-carrier in the frame format to add (step S 2).

[0054] Next, (m * (i + 1) + 1) is determined or not exceed the total number of subcarriers n (step S3), and if they fall short increments the reference count i (step S4) repeats steps S2~ step S4. By repeating this process, SIR values ​​of the (m + 1) th subcarrier when the reference number i indicates "1" is added to the frame format, (2m + 1) th when the reference number i indicates "2" SIR value of the sub-carriers are added to the format, Similarly, SIR value for each m present to n-th sub-carrier is added to the format.

[0055] On the other hand, Te Nio, the determination in step S3, determination result exceeds, if Ru, after the reference number i is initialized (i = 0) (step S 5), (m * i + 1) th and reception SIR value of the sub-carriers, and calculates the (m * (i + 1) + 1) th slope d with the reception SIR value of the sub-carrier (step S 6).

[0056] Then, the reference number j is initialized (j = l), initializes the maximum error h (h = 0) and after (scan Tetsupu S7), the slope d and (m * i + 1) th sub calculating an error g using received SIR value of the carrier and the reception SIR value (m * i + j + 1) th subcarrier (step S8). Here, seeking first reception SIR value of the sub-carrier and the SIR value of the second sub-carriers by interpolating the received SIR value force of the second sub-carrier, the SIR value of the second subcarrier calculated by interpolating calculating an error g of actual reception SIR value.

[0057] Error g calculated in step S8 is determined greater than the maximum error h (step S9), and substitutes the error g calculated in step S8 to the maximum error h if not the size (h = g), the target incremented by reference number j of sub-carrier number t which is a (t = m * i + j) (step S10). In this case, since it is initially calculated error g, the error g is substituted as the maximum error h.

[0058] The reference number j + 1 is determined or not exceed the m (step S 11). On the other hand, in the determination of Sutetsu flop S9, and if smaller directly by skipping the process of step S 10, ヽ a criteria number j + 1 is greater than the m, or not (step S 11). Step S 11 determines the result is higher than the? /, It! /, In case, after the reference number j is incremented (j = j + 1) (Step S1 2), repeats the processing of step S7~ step S12 .

[0059] By repeating the processing of steps S7~ step S 12, after calculating the error g of 3-th subcarrier, and compares the error g and the maximum error h. If larger heard from the error g maximum error h, while registering the error g as the maximum error h, or error g is less than the maximum error h, calculates an error g of 4-th subcarrier, as well as the maximum compared with the error h. The above processing is repeated until m-th sub-carrier, to detect the sub-carrier number and SIR value with the maximum error h between the first sub-carrier (m + 1) th subcarrier.

[0060] On the other hand, in the determination at step S11, if the determination result is above adds the reception SIR value and Sabukiya rear number t in the frame format (step S 13). After the reference number i is incremented (i = i + l) (step S14), (m * i + l) is greater than the total number of subcarriers n, Luca determines (step S15).

[0061] exceeded, Do, the case, the process returns to step S7, in turn repeats the processing of step S7~ step S12 while incrementing the reference number i. Thus, in turn detects the (m + 1) -th subcarrier (2m + 1) -th maximum error h become subcarrier number and the reception SIR values ​​between subcarriers. Then, the above processing repeatedly with n-th Sabukyariama detects the maximum error h become subcarrier number and the reception SIR value of each section is described in the frame format shown in FIG.

[0062] Thus, in the case of using the first decimation algorithm, a predetermined number (m present) received SIR value of the sub-carrier for each, as well as the error between the actual reception SIR value is highest Sabukiyari § No. and it detects the reception SIR value, notifies the base station 100 as the radio channel information. For this reason, it is possible to improve the transmission efficiency on the link to notify the channel information as compared with the case of notifying the reception SIR values ​​of all subcarriers. Further, since the actual erroneous difference highest subcarrier number of the received SIR value and the reception SIR value that is notified, to modify the modulation scheme 'code I 匕率 based on the information in the base station 1 00 can. Thus, the modulation scheme and the like that do not conform to radio state is selected, Runode can avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication.

[0063] Next, a description will be given of the second thinning algorithm. Second decimating algorithm, curve obtained by connecting the received SIR value (hereinafter, referred to as "received SIR curve".) Subcarrier number when the inclination is changed more than a certain value and detect a reception SIR value Ru der shall be. By notifying only the subcarriers and the reception SIR value of the detected subcarrier number to the base station 100, also of a is thinned out reception SIR value of the other sub-carriers as a result.

[0064] FIG. 6 is a diagram for explaining the outline of the second thinning algorithm. Further, FIG. 7 is a flow chart for explaining a second decimating algorithm. Further, FIG. 8 is a diagram showing an example of a frame format used to notify use a second bow I-out algorithm between the reception SIR value of the sub-carrier identified Te to the base station 100.

[0065] In a second decimation algorithm, as shown in FIG. 6, in the receiving SIR curve, calculates the inclination of the receiving SIR values ​​between the subcarrier, the slope between calculation target subcarriers, a reference sub extracting the subcarrier number and the reception SIR value when changing the inclination force more than a certain value between the carrier.

[0066] The frame format used in the notification to the base station 100, sub-carrier number and the reception SIR value that was extracted as described above is described. If is using the example shown in FIG. 6, first, fourth, the description 8th ... subcarrier number and the reception SIR value thereof, and to be notified to the base station 100.

[0067] The specific algorithm, as shown in FIG. 7, first, after the subcarrier numbers t initialize (t = 1) (step S21), t th subcarrier number and the reception SIR value adding to the frame format (step S22). After the reference number j is initialized (j = l) (step S23), (t + j) is the number of subcarriers to determine whether the same as the total number of subcarriers n shown (step S 24). If the same moves the process to step S33, adds the subcarrier number (t + j) th sub-carrier number and the reception SIR value in the frame format.

[0068] On the other hand, in the determination at step S24, if not identical to calculate the reception SIR value of t th subcarrier, the inclination A of the received SIR value (t + j) th sub-carrier (Sutetsu flop S25). Then, the calculated slope threshold corresponding to A (lower threshold Pmin, upper threshold Pmax) also threshold table force shown in FIG. 9, which is set in advance the search (step S 26). After the reference number j is incremented (j = j + 1) (step S27), again (t + j) is Sabukiya rear speed is determined whether the same as the total number of subcarriers n shown (step S28). If the same moves the process to step S33, adds the subcarrier number (t + j) th sub-carrier number and the reception SIR value in the frame format.

[0069] On the other hand, in the determination of step S28, if not identical to calculate the reception SIR value of t th subcarrier, the inclination B of the received SIR value (t + j) th sub-carrier (Sutetsu flop S29). Further calculates (t + j- 1) -th subcarrier and the reception SIR values, the slope C of the received SIR value (t + j) th sub-carrier (step S30). Then, either the calculated slope B and slope C determines whether a value other than the value between the threshold value Pmin and the threshold value Pmax of the above (step S31).

[0070] If both the slope B and slope C is a value between the threshold value Pmin and the threshold value Pmax, it is determined that there is no significant change in the reception SIR value curve, after returning the process to step S27, step S the process is repeated 27 to step S31. On the other hand, if either the slope B and slope C is a value other than the value between the threshold value P min and the threshold value Pmax, it is determined that the major changes there ivy the reception SIR curve, the subcarrier number t (t + j - 1) was substituted for (step S32), the process returns to the scan Tetsupu S22. Then, the process is repeated step S22~ step S32.

[0071] Then, while repeating the processing of steps S22~ step S32, it is determined at step S24 or scan Tetsupu S28, if it is determined the same as the total number of subcarriers n, the subkey Yaria number (t + j) th sub to add Caro the carrier number and the reception SIR value in the frame format (step S33), and ends the second decimation algorithm.

[0072] Here, shown specific example of a case where the sub-carrier number t is "1". In this case, or not a adds 1 th subcarrier number and the reception SIR value in the frame Four Matsudo at step S22. Then, in step S25, the reception SIR value for the first sub-carrier, after calculating the inclination A between the reception SIR value of the second sub-carrier, in step S26, threshold value corresponding to the slope A (lower threshold Pmin, Search the upper threshold Pmax). Thereafter, the stearyl-up S29, the reception SIR value for the first sub-carrier, after calculating the slope B of the received SIR value of the third sub-carrier, in step S30, reception of the second sub-carrier It calculates the SIR value, the slope C of the reception SIR value of the third sub-carrier. Then, in Sutetsu flop S31, gradient B, either C is by determining the lower limit threshold value Pmin, whether Ne以 outside in value between the upper threshold Pmax, is determined the slope of the change point. That is, the slope B, either the lower threshold Pmin and C, when the value other than the value between the upper threshold Pmax, to determine the slope of the change point and the previous sub-carrier, the second sub-carrier number and its to add a received SIR value to format. Such processing by performing up to n-th sub-carrier, to detect the sub-carrier number and the reception SIR value in the case where the inclination of the received SIR curve is changed more than a certain value, described in the frame format shown in FIG. 8 .

[0073] Thus, when a second decimation algorithm detects the subcarrier number and the reception SIR value when the slope of the received SIR curve changes more than a value, a base as the radio propagation path information to inform the station 100. Therefore, it is possible to improve the transmission efficiency on the link as compared with the case to notify the reception SIR values ​​of all the sub-carriers can be greatly reduced radio channel information amount, and notifies the channel information . Further, since the reception SIR value and the subcarrier number in the case the slope of the received SIR curve is changed more than a predetermined value is notified, to prevent the actual reception SIR value and the reception SIR value greatly deviated is notified be able to. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, since errors in communication can be avoided you increase, it is possible to suppress the occurrence of errors in communication.

[0074] Next, a description will be given of a third decimation algorithm. Third thinning algorithm is for detecting the subcarrier number and the reception SIR value if the slope of the received SIR curve is reversed (decreased or reduced force up Caro-increasing Caro). The detected sub-carrier number and by notifying the reception SIR value only to the base station 100, in which thinning otherwise Sabukiyari § number and the reception SIR value as a result.

[0075] FIG. 10 is a diagram for explaining the outline of the third thinning algorithm. Further, FIG. 11 is a flowchart illustrating a third thinning algorithm. Further, FIG. 12 is a diagram showing an example of a frame format used to notify use a third decimation algorithm V, reception SIR value of the sub-carrier identified Te to the base station 1 00.

[0076] In a third thinning algorithm, as shown in FIG. 10, the reception SIR curve, receiving the subcarrier number in the case of gradient in the receiving SIR curves by comparing the received SIR value between adjacent subcarriers is reversed to extract the SIR value.

[0077] The frame format used in the notification to the base station 100, sub-carrier number and the reception SIR value that was extracted as described above is described. Lever using the example shown in FIG. 10, first, fifth, tenth ... subcarrier number and the reception SIR value thereof is described, and it is notified to the base station 100.

[0078] The specific algorithm, as shown in FIG. 11, first, after the subcarrier numbers t initialized (t = 1) (step S41), the t-th subcarrier number and the reception SIR value Add to the frame format (step S42). After the reference number j is initialized (j = l) (step S43), (t + j) is the number of subcarriers to determine whether the same as the total number of subcarriers n shown (step S44). If the same moves the process to step S52, adds the subcarrier number (t + j) th sub-carrier number and the reception SIR value in the frame Four Matsudo.

[0079] On the other hand, in the determination of step S44, if not identical to calculate the reception SIR value of t th subcarrier, the difference oc between the received SIR value (t + j) th sub-carrier (Sutetsu flop S45). After the reference number j is incremented (j = j + l) (step S46), again (t + j) is the number of subcarriers to determine whether the same as the total number of subcarriers n shown (step S47). If the same moves the process to step S52, adds the subcarrier number (t + j) th sub-carrier number and the reception SIR value in the frame format.

[0080] On the other hand, in the determination of step S47, the if not identical calculates the reception SIR value of t th subcarrier, the difference 13 between the received SIR value (t + j) th sub-carrier (Sutetsu flop S48). Then, a case where the difference a is 0 or a is | 8 or greater, or a case where the difference a is smaller than 0 a is smaller than the beta, or it is determined (step S49). , If does not correspond to the deviation, it is determined that there is no reversal of the slope in the reception SIR curve, substituting the difference j8 to the difference a (a = β) and after (step S50), the process returns to step S46. Then, the process is repeated step S46~ step S50.

[0081] On the other hand, if applicable, it determines that the reverse tilt has been made in the receiving SIR curve, the subcarrier numbers t - After substituting (t + j 1) (step S51), processing in step S42 It is returned. Then, the process is repeated step S42~ step S51. Then, while repeating the processing of steps S42~ step S51, Te determination odor in step S44 or step S47, the If it is determined the same as the total number of subcarriers n, and the sub-carrier number (t + j) th sub-carrier number Add the reception SIR value in the frame format (step S52), and finishes the third thinning algorithm.

[0082] Here, shown specific example of a case where the sub-carrier number t is "1". In this case, or not a adds 1 th subcarrier number and the reception SIR value in the frame Four Matsudo at step S42. Then, in step S45, it calculates a reception SIR value for the first sub-carrier, a difference a between the reception SIR value for the second subcarrier. Then, calculated Oite a reception SIR value for the first sub-carrier, the difference j8 between the reception SIR value of the third sub-carrier in step S48. Then, in step S49, the magnitude relation between the difference (X and difference β difference a is that put the case of 0 or more, or the difference (X determines the size relationship between the difference a and the difference ι8 in the case of less than 0 it is the change point of the slope in the receiving SIR curve is reversed (hereinafter referred to as "reverse change point".) determines. that is, the difference a is 0 or more field Gonio difference oc Te is than the difference β also large, whereas the second sub-carrier is determined that the reverse change point if the difference (X our If it is less than 0, the difference a Te is the second in the case smaller again than the difference β sub carrier is determined that the reverse change point, to add a second Sabukiyari § number and the reception SIR value format. by performing such processing until n-th subkey Yaria slope at the receiving SIR curve reversal subcarrier number and receive in the case of It detects a signal SIR value, describing the frame format shown in FIG. 12.

[0083] Thus, in the case of using the third decimation algorithm detects the subcarrier number and the reception SIR value in the case of reversed inclination outs in reception SIR curve base as the wireless channel information to inform the station 100. Therefore, it is possible to improve in comparison with the case of notifying the reception SIR values ​​of all the sub-carriers can be greatly reduced radio channel information amount, transmission efficiency on the link that notifies the channel information . Further, since the sub-carrier number and the reception SIR value when the inclination is reversed at the receiving SIR curve is notified, it is possible to prevent the actual received S IR value and the reception SIR value greatly deviated is notified it can. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication.

[0084] The following describes the fourth thinning algorithm. Fourth thinning algorithm is configured to detect a subcarrier number and the reception SIR value when the inclination is reversed (reduced from increasing SC or decrease power increase Caro) in the receiving SIR curve, between subcarrier numbers whose inclination is reversed are located in the middle detects a reception SIR value of the sub-carrier. By notifying only the test sub-carrier number and the reception SIR value issued to the base station 100, in which thinning otherwise subcarrier number and the reception SIR value as a result.

[0085] FIG. 13 is a diagram for explaining the outline of the fourth thinning algorithm. Further, FIG. 14 is a flowchart for explaining a fourth thinning algorithm. Further, FIG. 15 is a diagram showing an example of a frame format used to notify V use the fourth bow I-out algorithm between subcarrier numbers and received SI R value thereof were identified Te to the base station 100 is there. Since in the fourth thinning algorithm, having the same processing as the flow shown in FIG. 11 Te flow day, to detect the sub-carrier number and the reception SIR value when the inclination is reversed in the receiving SIR curve, the description thereof will be omitted.

[0086] In a fourth thinning algorithm, as shown in FIG. 13, the reception SIR curve, subcarrier numbers of when the slope in the receiving SIR curves by comparing the received SIR value between adjacent subcarriers is reversed and its extracting the received SIR value, further extracts the reception SIR value of the sub-carriers located intermediate the extracted subcarrier number.

[0087] The frame format used in the notification to the base station 100, the subcarrier number and the reception SIR value is extracted as described above, as well as sub-carriers are positioned intermediate the sub-carrier number reception SIR values ​​are described in. If is using the example shown in FIG. 13, first, fifth, 18th, 27th ... subcarrier number and the reception SIR value, and is disposed intermediate the fifth subcarrier and 18th subcarrier that 11 th subcarrier number and the reception SIR value is 18 th 22 th subcarrier number and the reception SIR Negaki predicate disposed intermediate the subcarrier and 27th subcarrier, the base station 100 and thus to be notified.

[0088] The specific algorithm, as shown in FIG. 14, and calculates the total number k of reversing the change point detected by the flow shown in FIG. 11 (step S61). After the reverse changing points s is initialized (s = 1) (step S62), s-th reverse change point of the (s + 1) -th number of subcarriers is determined whether or present γ between the reverse change point (step S63).

[0089] When the number of subcarriers is equal to or greater than present γ calculates the s-th reverse change point of the (s + 1) -th intermediate arranged subcarrier numbers of subcarriers between a reversal point of change (step S64). Then, after extracting the reception SIR value of the calculated intermediate subcarriers (Step-up S65), and adds the received SIR value in the frame format (step S66).

[0090] Thereafter, increments the reverse change points s (s = s + l) and after (step S67), (s + 1) is determined greater the than the total number k of the reverse change point (step S68). If large ends the fourth algorithm. On the other hand, when it is smaller, the process returns to step S63, and repeats the processing of stearyl-up S63~ step S68. Step S63~ out to repeat the process in step S68, it is determined at step S68, if it is large the Most determined than the total number k of the reverse rotation change point (s + 1), the fourth algorithm is completed.

[0091] Note that, in the determination at step S63, if the number of subcarriers is determined to be less than γ this moves the process to step S67, the reverse change point (s + 1) again for the processing of steps S63 ~ Step S68 It is carried out. That, s-th reverse change point of the (s + 1) th number of subcarriers between a reverse change point in the case of less than γ present does not perform the calculation of Sabukiyari § disposed intermediate.

[0092] Here, the first sub-carrier number of reverse change point "Α", the second reversing change point subcarrier number "Β" subcarrier number of the third reverse change point "C" · · · last subcarrier number of reverse change point indicates a specific example of the case where "N". In this case, as shown in FIG. 1 5, subcarrier number, and the reception SIR value that each reversing change point is described in the frame format. Then, in step S64, the sub-carrier number disposed intermediate the A-th sub-carrier and B-th sub-carrier is calculated. Thus, the {(A + B) Z2} is calculated as a subcarrier number. Then, in step S65, the reception SIR value of {(A + B) Z2} th subcarrier are extracted, step S66 Te odor, is added to the frame format. Such processes by carrying out up to subcarriers of the N-th reverse change point, and detects the sub-carrier number and the reception SIR value when the inclination is reversed in the receiving SIR curve, subcarrier number whose inclination is reversed It detects a reception SIR value of the sub-carriers located intermediate between, described in the frame format shown in FIG. 15.

[0093] Thus, in the case of using the fourth thinning algorithms are subcarriers and detects the sub-carrier number and the reception SIR value in the case of reversed inclination outs in reception SIR curve, its slope reversed It detects the reception SIR value of the sub-carriers are arranged in the middle between the number, and notifies the base station 100 as the radio channel information. Therefore, it is possible to improve the transmission efficiency on the link which can greatly reduce the radio channel information amount as compared with the case of notifying the reception SIR value for all the subcarriers, and notifies the channel state information. Also, it is possible to prevent the Runode be notified subcarrier number and the reception SIR value when the inclination is reversed in the receiving SI R curve, the actual reception SIR value and the reception SIR value greatly deviated notified it can. Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication. Further, since the reception SIR value of the sub-carriers slope of reception SIR curve Ru is located midway between subcarrier numbers were reversed is notified, the modulation scheme 'coding rate at the base station 100 based on the information it can be modified. Thus, it is possible to choose a more compatible modulation schemes such as the radio conditions, it is possible to further suppress the occurrence of errors in communication.

[0094] Next explained is the fifth thinning algorithm. Fifth thinning algorithm is configured to detect a subcarrier number and the reception SIR value when the inclination is reversed (reduced from increasing SC or decrease power increase Caro) in the receiving SIR curve, the subcarrier number whose inclination is reversed and it detects the sub-carrier number with intermediate reception SIR value between the received SIR value. By notify only subcarrier numbers and its received SIR value and the detected base station 100 is intended thinning rather the other subcarrier numbers and the reception SIR value as a result.

[0095] FIG. 16 is a diagram for explaining the outline of the fifth thinning algorithm. Further, FIG. 17 is a flowchart for explaining a fifth thinning algorithm. Further, FIG. 18 is a diagram showing an example of a frame format used to notify V use the fifth thinning algorithm, subcarrier number, and receive SI R value thereof were identified Te to the base station 100. Since in the fifth thinning algorithm, having the same processing as the flow shown in FIG. 11 Te flow day, to detect the sub-carrier number and the reception SIR value when the inclination is reversed in the receiving SIR curve, the description thereof will be omitted.

[0096] In the fifth thinning algorithm, as shown in FIG. 16, the reception SIR curve, subcarrier numbers of when the slope in the receiving SIR curves by comparing the received SIR value between adjacent subcarriers is reversed and its extracting the received SIR value, further extracts the subcarrier numbers with receiving SIR value is an intermediate value of the extracted received SIR value.

[0097] The frame format used in the notification to the base station 100, the subcarrier number and the reception SIR value is extracted as described above, as well as the reception SIR value is an intermediate value of these received SIR value It described the subcarrier number to have a. In that reference to the example shown in FIG. 16, first, fifth, 18th, 27th ... subcarrier number and the reception SIR value, and the reception of the 5-th received SIR value of the sub-carrier and 18 th subcarriers having a 14 th subcarrier number, 18-th received SIR value is an intermediate value between the reception SIR value of the received SIR value and 27 th subcarriers Sabukiya rear having an intermediate value become reception SIR value with the SIR value 21-th subcarrier number is written, and to be notified to the base station 100

[0098] The specific algorithm, as shown in FIG. 17, and calculates the total number k of reversing the change point detected by the flow shown in FIG. 11 (step S71). After the reverse changing points s is initialized (s = 1) (step S72), s-th reverse change point of the (s + 1) -th number of subcarriers is determined whether or present γ between the reverse change point (step S73).

[0099] When the number of subcarriers is equal to or greater than present γ is, s th and reception SIR value of subkey Yaria corresponding to reverse the change point, (s + 1) th corresponding subcarrier received reverse change point calculating an intermediate value (to become reception SIR value) of the SIR value (step S74). Then, after extracting the subcarrier number with the calculated intermediate value (step S75), it adds the subcarrier number in the frame format (step S76).

[0100] Thereafter, increments the reverse change points s (s = s + l) and after (step S77), (s + 1) is determined greater the than the total number k of the reverse change point (step S78). If large ends the fifth algorithm. On the other hand, when it is smaller, the process returns to step S73, and repeats the processing of stearyl-up S73~ step S78. Step S73~ out to repeat the process in step S78, it is determined at step S78, if it is large the Most determined than the total number k of the reverse rotation change point (s + 1), the fifth algorithm is completed.

[0101] Incidentally, Te Nio, the determination in step S73, if the number of subcarriers is determined to be less than γ this moves the process to step S77, the re for reversing change point (s + 1), steps S73 ~ step S78 perform processing of. That is, Do perform calculation of the intermediate value of the received SIR values ​​of the corresponding subcarriers when the number of subcarriers between the s-th reverse change point of the (s + 1) th reverse change point is less than the gamma! /,.

[0102] Here, the receiving SIR value of the sub-carrier of the first reverse change point "A", the reception SIR value of the sub-carrier of the second reverse change point "B", the third reverse change point reception SIR value of the sub-carrier is shown for example in the case "C" ... reception SIR value of the sub-carrier of the last reverse change points is "N". In this case, as shown in FIG. 18, the sub-carrier number and the reception SIR value that each reversing change point is described in the frame format. Then, in step S7 4, an intermediate value between the reception SIR value A and the reception SIR value B is calculated. Thus, as the intermediate values ​​{(A + B) Z2} is calculated. Then, in step S75, {(A + B) Z2} subcarrier numbers of subcarriers with closest reception SIR value to an intermediate value of is extracted, in step S76, is added to the frame format. Such a process by carrying out to the reception SIR value of the sub-carrier of the last reverse change point, and detects the sub-carrier number and the reception SIR value in the case of reversed inclination outs in reception SIR curve, its slope reversed by detecting an intermediate reception SIR value between the reception SIR value of the sub-carrier number and describes the frame format shown in FIG. 18. [0103] Thus, in the case of using the fifth thinning algorithms are subcarriers and detects the sub-carrier number and the reception SIR value in the case of reversed inclination outs in reception SIR curve, its slope reversed detects Sabukiyari § number with intermediate reception SIR value between the reception SIR value number, it notifies the base station 100 as the radio channel information. Therefore, it is possible to improve the transmission efficiency on the link that can you to greatly reduce the radio channel information amount as compared with the case of notifying the reception SIR values ​​of all of the subcarrier, and notifies the channel information . Further, since the sub-carrier number and the reception SIR value when the inclination is reversed at the receiving SIR curve is notified, it is possible to prevent the reception SIR value that deviate significantly from the actual reception SIR value is notified . Thus, the modulation scheme and the like that do not conform to the radio conditions are selected, it is possible to avoid a situation where errors of the communication is increased, it is possible to suppress the occurrence of errors in communication. Further, since the sub-carrier number with intermediate reception SIR value between the received S IR value of subcarrier numbers inclination is reversed at the receiving SIR curve is notified, the modulation scheme of these information in the base station 100 based on ' it is possible to modify the sign I 匕率. Thus, it is possible to choose a more compatible modulation schemes such as the radio conditions, it is possible to further suppress the occurrence of errors in communication.

[0104] The above first to fifth thinning algorithm described as, as described above, for example, can be used by switching depending on the situation of the error in the non-linear channel. When used in switched thinning algorithm, and thus require a common recognize the selected decimation algorithm between the base station 100 and the mobile station 200. Hereinafter, the case of notifying the reception SIR information by switching the thinning algorithm.

[0105] arrangements in this case, advance between the base station 100 and the mobile station 200, holds the common table each decimation algorithm is registered, the timing for notifying-out selected Mayumi I algorithm achieved by advance is possible. The timing for notifying the selected decimation algorithm, for example, the timing of such before starting the data communication is assumed.

[0106] FIG. 19 is a diagram showing an example of a common table in advance is held by the base station 100 and mobile station 200. In the table shown in FIG. 19, the notification numbers corresponding to the first to fifth thinning algorithms are registered. Such table may be held by the base station 100 and the mobile station 200, Mayumi selected by sending describing the thinning algorithm selected in the frame format shown in FIG. 20 to the base station 100 common understanding of the I-out algorithm is possible.

[0107] the frame format shown in FIG. 20, a frame that describes the number of thinning algorithm (algorithm number), 5, 8, 12, to describe the reception SIR information shown in FIG. 15 and FIG. 18 and the frame is provided. In base station 100, in the this reading the reception SIR information reads the algorithm number described in such frames follower one mat, mobile station 200 can recognize the thinning algorithm selected.

[0108] In the communication system according to this embodiment, selecting the thinning algorithm according to the error status of the radio channel. Error determination method in the radio propagation path is not limited to Japanese. For example, a receiving SI R value for each actual m lines measured by the mobile station 200, most small error reception SIR value by comparison of the sub-carrier for each the m calculated in the thinning algorithm, the thinning algorithm it may be selected, and the reception SIR value of the sub-carriers randomly selected by the mobile station 2 00, appropriate thinning error by comparing the received SIR value of the sub-carrier having the smallest calculated in the thinning algorithm Arugo rhythm may be selected. Note that differ in the thinning algorithm, preferably as the same is the embodiment selecting a thinning algorithm has low radio propagation information amount notified to the base station 100 when the error is detected.

[0109] Thus, when used in switching the first to fifth thinning algorithm, the base radio propagation path information to select the most appropriate Mayumi I-out algorithm according to the state of the radio propagation path it becomes possible to notify the station 100. Particularly, in the case of notifying the radio channel information and select the thinning algorithm according to the error status of the radio propagation path, while reducing radio Den 搬路 information amount, a modulation scheme and coding rate of the selected conventional can be carried out in the manner the same level, it is possible to realize an improvement of the transmission efficiency.

[0110] As described above, according to the wireless communication system according to this embodiment, Runode create a radio channel information obtained by thinning the received SIR value specific subcarrier SIR210 mobile station 200, all it is possible to improve transmission efficiency on the link to notify the transfer 搬路 information as compared with the case of notifying the reception SIR value of the sub-carrier to the base station 100.

[0111] In the above description, the force present invention that describes When generating a radio propagation path information based on the received SIR, the received SNR (signal power to noise Nag being limited thereto power ratio: signal to noise power ratio) or reception SINR (signal power to interference noise power ratio: signal to interference Plus noise power ratio) in based, also possible to generate a radio propagation path information Te good.

[0112] Further, in the above description, embodiments for the force present invention are described in Nag limited to this mobile electrode 200 forces also base stations on the downlink from the base station 100 to mobile station 200 100 it is possible to adapt the uplink to. In this case, it is possible to obtain the same effect as in the present embodiment.

[0113] Further, in the above description, based on the radio channel conditions on the receiver side, a modulation scheme and coding rate for each subkey Yaria and adaptively varied radio communications system which performs high-speed communication the described forces present invention can also be applied to subcarriers of good radio propagation path conditions in a radio communication system assign to a user performing high-speed communication based on radio propagation path conditions Nag being limited thereto it is.

BRIEF DESCRIPTION OF THE DRAWINGS

[0114] [FIG. 1] Ru block diagram illustrating a configuration of a base station constituting the radio communication system according to the present invention.

[Figure 2] Ru block diagram showing a configuration of a mobile station constituting the radio communication system according to the present invention.

3 is a diagram for explaining the outline of the first thinning algorithm.

4 is a flow chart for explaining a first decimating algorithm.

5 is a diagram showing an example of a frame format used to notify the reception SIR value of the sub-carrier identified using a first thinning algorithm to the base station.

6 is a diagram for explaining the outline of the second thinning algorithm.

7 is a flow chart for explaining a second decimating algorithm.

8 is a diagram showing an example of a frame format used to notify the reception SIR value of the sub-carrier identified using a second thinning algorithm to the base station.

In [9] a second decimation algorithm is a diagram showing a table example of a threshold for the inclination of the received SIR curve. FIG. 10 is a diagram for explaining the outline of the third thinning algorithm.

11 is a flow chart for explaining a third thinning algorithm.

12 is a diagram showing an example of a frame format used to notify the reception SIR value of the sub-carrier identified using a third thinning algorithm to the base station.

13 is a diagram for explaining the outline of the fourth bow I-out algorithm between.

14 is a flowchart for explaining a fourth thinning algorithm.

15 is a diagram showing an example of a frame format used to notify the reception SIR value of the sub-carrier identified using a fourth thinning algorithm in the base station.

16 is a diagram for explaining the outline of the fifth thinning algorithm.

17 is a flow chart for explaining a fifth thinning algorithm.

18 is a diagram showing an example of a frame format used to notify the reception SIR value of the sub-carrier identified using a fifth thinning algorithm in the base station.

Ru Figure showing one example of a common table in advance is held in FIG. 19 base station and the mobile station.

FIG. 20 is a diagram showing an example of a frame follower one mat to notify the base station of the decimation algorithm selected by the mobile station.

Is a diagram illustrating an example of the transmission power at the time [21] The base station power also of the transmission.

Shows the received signal of a mobile station when the affected [22] frequency off Jingu.

23 is a diagram showing a communication system example of determining the modulation scheme 'code I 匕率 based on the received SIR of the mobile station.

FIG. 24 is a diagram for explaining a method of reporting channel information in a conventional manner.

[FIG 25 is a diagram of order to explain the modulation scheme example selected from the notification method of propagation path information of the conventional method.

DESCRIPTION OF SYMBOLS

100 base station apparatus (base station)

108 uplink reception processing unit

109 SIR information extracting section 200 mobile station apparatus (mobile station) 207 SIR estimator

210 SIR information creation unit

Claims

The scope of the claims
[1] and the propagation path condition estimating unit that estimates a channel state from a radio signal received from the communication partner,
And channel information creation unit that creates a channel state information a value indicating the channel status of a particular sub-carrier was Mayumi I ヽ according to the estimated result of the propagation path condition estimating unit,
Radio transmitter, characterized in that it comprises a transmission processing unit for transmitting the channel information created by the channel information generation unit to the communication partner.
[2] The channel information generator includes a value indicating the channel state for subcarriers selected for each predetermined number is Nekakara linear interpolation indicating the channel state for subcarriers adjacent the selected value most error is large propagation Sabukiya rear number having a value indicative of a channel status and a radio transmitter according to claim 1, feature to create a propagation path information from the values ​​and only indicating the propagation path condition.
[3] The channel information creation unit, the sub-carrier number and a channel state when the slope of the resulting curve is changed preset predetermined value or more in the this connecting a value that indicates propagation path condition of each sub-carrier creating a channel information from the values ​​and only showing a radio transmitter according to claim 1 or claim 2 wherein.
[4] The channel information creation section includes a value indicating the subcarrier number and its channel conditions when the sign of the slope of the curve obtained with the this connecting a value that indicates propagation path condition of each subcarrier is changed radio transmitter according to claims 1 請 Motomeko 3, on whether the deviation, characterized in that to create the channel information from only.
[5] The channel information creation section includes a value indicating the subcarrier number and its channel conditions when the sign of the slope of the curve obtained with the this connecting a value that indicates propagation path condition changes for each sub-carrier , claims 1 to 4, characterized in that you create a channel information from only the values ​​indicating the channel state for subcarriers sign of the slope of the curve is located midway between subcarrier numbers have changed radio transmitter according to any one of.
[6] The channel information creation section includes a value indicating the subcarrier number and its channel conditions when the sign of the slope of the curve obtained with the this connecting a value that indicates propagation path condition changes for each sub-carrier any of claims 1 to 5, characterized in that to create a propagation path information only subcarrier numbers having a value indicative of the intermediate propagation path condition of the inter-subcarrier number sign of the slope changes of the curve radio transmitter crab described.
[7] The channel information creation unit, a radio transmitter according to claim 6, wherein the creating the channel information data amount smallest system by selecting the channel information.
[8] The propagation path condition estimating unit radio transmitter according to any one of claims 1 to 7, characterized in that estimating the signal power to interference power ratio as the channel state.
[9] The propagation path condition estimating unit radio transmitter according to any one of claims 1 to 7, characterized in that estimating the signal power to noise power ratio as the channel state.
[10] The propagation path condition estimating unit radio transmitter according to estimating a signal power to interference noise power ratio as the channel state from claim 1, wherein in any one of claims 7.
[11] The mobile station apparatus comprising: a radio transmitter according to any one of claims 1 to 10.
[12] of claims 1 to 10, the base station apparatus comprising: a radio transmitter according to any misalignment.
[13] that determine the mobile station apparatus according to any one of claims 10 claim 8, the modulation scheme and coding I 匕率 using the channel information received on each subcarrier from the mobile station device wireless communication system comprising: the base station apparatus.
PCT/JP2006/303051 2005-04-08 2006-02-21 Wireless transmitter and wireless communication system WO2006112133A1 (en)

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JP2005-111904 2005-04-08

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JP2011142436A (en) * 2010-01-06 2011-07-21 Kyocera Corp Radio transmitter and radio receiver
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WO2008084623A1 (en) * 2007-01-12 2008-07-17 Ntt Docomo, Inc. Base station device and communication control method
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JP2011142436A (en) * 2010-01-06 2011-07-21 Kyocera Corp Radio transmitter and radio receiver
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JPWO2006112133A1 (en) 2008-12-04

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