WO2009145252A1 - 受信装置および適応変調方法 - Google Patents
受信装置および適応変調方法 Download PDFInfo
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- WO2009145252A1 WO2009145252A1 PCT/JP2009/059761 JP2009059761W WO2009145252A1 WO 2009145252 A1 WO2009145252 A1 WO 2009145252A1 JP 2009059761 W JP2009059761 W JP 2009059761W WO 2009145252 A1 WO2009145252 A1 WO 2009145252A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates to a receiving apparatus and an adaptive modulation method, and more particularly, to a radio communication technique using an orthogonal frequency division multiple access scheme.
- next generation PHS Next Generation Generation Personal Handy-phone System
- OFDMA Orthogonal Frequency Division Multiple Access
- SINR Signal Quality of a received communication signal
- the base station Based on Signal toInterference and Noise Ratio (signal-to-interference and noise ratio), the base station sends a modulation method request (MR: MCR Request) including the determined modulation method (MCS: Modulation and Coding Scheme) (See Non-Patent Document 1).
- MR MCR Request
- MCS Modulation and Coding Scheme
- a modulation method of a communication signal transmitted from a transmission device to a reception device is determined based on signal quality after reception power is controlled by AGC (Automatic Gain Control).
- AGC Automatic Gain Control
- next-generation PHS in a receiving apparatus of a wireless communication system that adopts an OFDMA method in addition to an adaptive modulation method, AGC cannot be performed for each subchannel.
- the reception power of the communication signal is controlled in accordance with the maximum reception power of the signal received at.
- the present invention has been made in view of the above-described conventional problems, and in a wireless communication system employing an adaptive modulation scheme and an OFDMA scheme, a communication signal caused by a signal arriving intermittently from a device different from a transmission device.
- An object of the present invention is to provide a receiving apparatus and an adaptive modulation method capable of reducing demodulation errors.
- a receiving apparatus uses the received power of a communication signal transmitted from a transmitting apparatus via at least one of subchannels according to an orthogonal frequency division multiple access scheme together with the communication signal.
- the transmission device Based on the reception power control means for controlling the maximum reception power of the signal received on any of the subchannels, and the signal quality of the communication signal whose reception power is controlled by the reception power control means, the transmission device A modulation scheme determining means for determining a modulation scheme for a new communication signal transmitted from the transmission apparatus, and transmitting the new communication signal to the transmitter using the modulation scheme determined by the modulation scheme determining means.
- the receiving device that requests, the maximum reception power of the signal transmitted from the transmission device, and the maximum reception of the signal arriving from a device different from the transmission device
- receiving power difference detecting means for detecting a received power difference between the received power difference and the modulation scheme determining means based on the received power difference detected by the received power difference detecting means.
- the modulation method is determined.
- the receiving apparatus includes not only the signal quality of a communication signal whose reception power is controlled, but also the maximum reception power of a signal transmitted from a transmission apparatus and the maximum reception power of a signal arriving from an apparatus different from the transmission apparatus. Based on the received power difference, a modulation method for a new communication signal transmitted from the transmission device is determined. Therefore, according to the present invention, it is possible to reduce a demodulation error of a communication signal caused by a signal that intermittently arrives from a device different from the transmission device.
- it further includes period detection means for detecting a period in which the maximum received power of a signal arriving from a device different from the transmitting device exceeds the maximum received power of a signal transmitted from the transmitting device.
- the modulation scheme determining means determines the modulation scheme of the new communication signal based further on the period detected by the period detecting means.
- the modulation scheme determining unit is configured to perform the new communication based on the received power difference detected by the received power difference detecting unit at a timing corresponding to the cycle detected by the cycle detecting unit. Determine the modulation method of the signal.
- the modulation method of the communication signal is changed at a timing corresponding to the arrival period of the strong input signal that periodically arrives from a device different from the transmission device, the strong signal is suppressed while suppressing a decrease in throughput. It is possible to reduce the demodulation error of the communication signal caused by the input signal.
- the period detection unit may be configured such that the reception power of the control signal transmitted from the proximity transmission apparatus close to the transmission apparatus exceeds the reception power of the control signal transmitted from the transmission apparatus.
- the received power difference detecting means detects a received power difference between the received power of the control signal transmitted from the transmitting apparatus and the received power of the control signal transmitted from the proximity transmitting apparatus.
- it further includes frequency detection means for detecting a frequency at which a maximum received power of a signal arriving from a device different from the transmitting device exceeds a maximum received power of a signal transmitted from the transmitting device.
- the modulation scheme determining means determines the modulation scheme of the new communication signal based further on the frequency detected by the frequency detecting means.
- the modulation scheme determining unit determines the modulation scheme of the new communication signal based on whether or not the frequency detected by the frequency detecting unit is a predetermined value or more.
- the maximum received power of a signal arriving from a device different from the transmitting device exceeds the maximum received power of a signal transmitted from the transmitting device at the frequency detected by the frequency detecting unit.
- the modulation scheme determining means determines the modulation scheme of the new communication signal based on the comparison result by the estimated throughput comparison means.
- the modulation scheme it is possible to determine whether or not the modulation scheme needs to be changed so as to increase the throughput based on the arrival frequency of a strong input signal coming from a device different from the transmission device.
- the adaptive modulation method provides the received power of a communication signal transmitted from a transmission device via at least one of the subchannels based on the orthogonal frequency division multiple access scheme, along with the communication signal, in any one of the subchannels.
- Receiving in accordance with the maximum received power of the signal received in step, the maximum received power of the signal transmitted from the transmitting device, and the maximum received power of a signal arriving from a device different from the transmitting device Based on the step of detecting a power difference, the signal quality of the communication signal whose reception power is controlled, and the detected reception power difference, a modulation method of a new communication signal transmitted from the transmission device is determined. Determining, and causing the transmitting apparatus to transmit the new communication signal using the determined modulation scheme.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to an embodiment of the present invention. It is a functional block diagram of the mobile station which concerns on embodiment of this invention. It is a figure which shows an example of required SINR (required SINR table) according to a modulation system. It is a figure explaining the fluctuation
- SINR quired SINR table
- FIG. 1 is an overall configuration diagram of a mobile communication system 10 according to an embodiment of the present invention.
- the mobile communication system 10 includes a plurality of mobile stations 12 (only mobile stations 12-1 to 12-3 are shown here), a base station 14 (only one is shown here), It is comprised including.
- the base station 14 employs an OFDMA system and a TDMA / TDD (Time Division Multiple Access / Time Division Duplex: Time Division Multiple Access / Time Division Bidirectional Communication) scheme, and either a TDMA time slot or an OFDMA subchannel. Communication with each mobile station 12 is performed using at least one of the radio channels formed by a combination of any of the above.
- TDMA / TDD Time Division Multiple Access / Time Division Duplex: Time Division Multiple Access / Time Division Bidirectional Communication
- the mobile communication system 10 employs an adaptive modulation scheme that switches a radio signal modulation scheme according to the transmission path environment.
- the mobile station 12 communicating with the base station 14 not only receives the received signal quality of the communication signal transmitted from the base station 14 (for example, SINR after the reception power is controlled by the AGC), but also the base station 14 and the maximum received power of a signal arriving from a device different from the base station 14 (here, other bases close to the base station 14).
- a modulation method for a new communication signal transmitted from the base station 14 is determined. For this reason, the mobile station 12 can reduce a demodulation error of a communication signal caused by a signal that intermittently arrives from a device different from the base station 14 in communication.
- FIG. 2 is a functional block diagram of the mobile station 12.
- the mobile station 12 includes an antenna 20, a radio communication unit 22, an AGC unit 24, a demodulation unit 26, a decoding unit 28, a received power difference detection unit 30, a strong input signal characteristic detection unit 32, and a storage unit 34.
- the decoding unit 28, the received power difference detection unit 30, the strong input signal characteristic detection unit 32, the SINR calculation unit 36, the modulation scheme determination unit 38, the physical frame formation unit 40, and the modulation unit 42 are, for example, a CPU (Central Processing Unit) or DSP (Digital Signal Processor).
- CPU Central Processing Unit
- DSP Digital Signal Processor
- the antenna 20 receives a radio signal including a signal (control signal, communication signal, etc.) transmitted from the base station 14 and outputs the received radio signal to the radio communication unit 22. Further, the antenna 20 transmits a radio signal supplied from the radio communication unit 22 to the base station 14. Reception and transmission of radio signals are switched in a time division manner in accordance with instructions from the radio communication unit 22.
- a radio signal including a signal (control signal, communication signal, etc.) transmitted from the base station 14 and outputs the received radio signal to the radio communication unit 22. Further, the antenna 20 transmits a radio signal supplied from the radio communication unit 22 to the base station 14. Reception and transmission of radio signals are switched in a time division manner in accordance with instructions from the radio communication unit 22.
- the wireless communication unit 22 includes a low noise amplifier, a power amplifier, a local oscillator, a mixer, and a filter.
- the radio communication unit 22 amplifies a radio signal input from the antenna 20 with a low noise amplifier, down-converts the radio signal to an intermediate frequency signal, and outputs the signal to the AGC unit 24.
- the radio communication unit 22 up-converts the modulation signal input from the modulation unit 42 into a radio signal, amplifies the signal to a transmission output level with a power amplifier, and then supplies the radio signal to the antenna 20.
- the AGC unit 24 is a variable gain amplifier that controls the received power of the signal according to the maximum received power of the signal input from the wireless communication unit 22. Specifically, the AGC unit 24 amplifies or attenuates the received power of the signal over the entire reception band so that the maximum received power of the signal input from the wireless communication unit 22 becomes the upper limit of the dynamic range.
- the reception power of a communication signal transmitted from the base station 14 via at least one of these sub-channels is within the reception band. It is controlled according to the maximum received power of the signal received on any of the subchannels.
- the demodulator 26 includes an A / D converter, a serial-parallel converter, an FFT (Fast Fourier Transform) arithmetic unit, and a parallel-serial converter.
- the demodulator 26 performs GI (Guard Interval) removal, A / D conversion, serial-parallel conversion, discrete Fourier transform, parallel-serial conversion, etc., on the received power-controlled signal input from the AGC unit 24. , Obtain a sequence of complex symbols.
- the complex symbol sequence acquired in this way is output to the decoding unit 28. Further, the complex symbols of each subcarrier obtained by the discrete Fourier transform are divided for each subchannel, and the divided complex symbols of each subchannel are supplied to the received power difference detection unit 30 and the SINR calculation unit 36.
- the decoding unit 28 decodes the reception data corresponding to the symbol modulation method from the complex symbol sequence input from the demodulation unit 26, and outputs the decoded reception data to an upper layer (not shown).
- the received power difference detector 30 receives the control signal received power from the base station 14 based on the complex symbols of each subchannel input from the demodulator 26 (the maximum received power of the signal transmitted from the base station 14). ) And received power of a control signal periodically transmitted at a predetermined interval from another base station (hereinafter referred to as “proximity base station”) close to the base station 14 (a signal arriving from a device different from the base station 14) The maximum received power) is detected.
- the reception power difference is positive when the reception power of the control signal transmitted from the base station 14 exceeds the reception power of the control signal transmitted from the neighboring base station.
- the detected received power difference is stored in the storage unit 34.
- the strong input signal characteristic detector 32 Based on the received power difference detected by the received power difference detector 30, the strong input signal characteristic detector 32 receives from the base station 14 the received power of the control signal periodically transmitted at a predetermined interval from the adjacent base station. A cycle that exceeds the received power of the transmitted control signal, that is, a cycle in which the received power difference detected by the received power difference detection unit 30 is negative is detected. The detected cycle is stored in the storage unit 34.
- the storage unit 34 is composed of, for example, a semiconductor memory element, and the received power difference detected by the received power difference detection unit 30, the period detected by the strong input signal characteristic detection unit 32, and the required SINR for each modulation method shown in FIG. (Required SINR table) and the like are stored. Note that the received power difference and period stored in the storage unit 34 are updated to information sequentially detected by the received power difference detection unit 30 and the strong input signal characteristic detection unit 32, respectively.
- the SINR calculation unit 36 is based on the complex symbol of each subchannel input from the demodulation unit 26, and the SINR (one of signal qualities) of the communication signal transmitted from the base station 14 via at least one of the subchannels. Is calculated.
- the modulation scheme determination unit 38 is transmitted from the base station 14 based on the SINR of the communication signal calculated by the SINR calculation unit 36, and the received power difference, period, and required SINR table stored in the storage unit 34. A new communication signal modulation method is determined.
- FIG. 4 is a diagram showing a dynamic range variation caused by a control signal (denoted as another cell CCH (Common Channel)) periodically transmitted from a neighboring base station at a predetermined interval.
- a control signal denoted as another cell CCH (Common Channel)
- FIG. 7B shows the dynamic range when the control signal of the adjacent base station arrives.
- the base station 14 Before a control signal having power higher than the received power of a control signal (denoted as own cell CCH) transmitted from the base station 14 arrives from the neighboring base station, the base station 14 The reception power control is performed by the AGC unit 24 so that the reception power of the control signal (own cell CCH) becomes the upper limit of the dynamic range.
- the SINR of a communication signal (expressed as EXCH (Extra Channel)) transmitted from the base station 14 is higher than the required SINR of 64QAM (assuming that it is lower than the required SINR of 256QAM)
- the modulation scheme determining unit 38 determines 64QAM as a modulation method (MCS) of a new communication signal requested to the base station 14.
- MCS modulation method
- the neighboring base station Reception power control is performed by the AGC unit 24 so that the reception power of the incoming control signal (other cell CCH) becomes the upper limit of the dynamic range.
- the lower limit of the dynamic range is increased by the received power difference ⁇ between both control signals (received power of the other cell CCH ⁇ received power of the own cell CCH) as compared to the lower limit shown in FIG.
- the SINR of the communication signal (EXCH) transmitted from the base station 14 is less than the required SINR of 64QAM, an error occurs when demodulating the communication signal (EXCH) modulated by 64QAM. End up.
- the received power difference is added to the lower limit of the dynamic range.
- a new communication signal modulation method (MCS) required for the base station 14 is determined to be 16QAM.
- the modulation scheme determining unit 38 transmits the received power of the control signal periodically transmitted from the neighboring base station from the base station 14 when the received power difference stored in the storage unit 34 is periodically negative.
- the best possible modulation scheme applicable with this predicted SINR is selected from the required SINR table. For example, in the case shown in FIG.
- the modulation scheme determination unit 38 requests the base station 14 to A new communication signal modulation scheme (MCS) is determined to be 16QAM. Thereby, the demodulation error of the communication signal resulting from the control signal periodically transmitted from the neighboring base station can be reduced.
- MCS communication signal modulation scheme
- the modulation scheme determining unit 38 determines the timing at which the received power of the control signal transmitted from the neighboring base station exceeds the received power of the control signal transmitted from the base station 14 based on the period stored in the storage unit 34.
- the modulation method may be determined by the method described above with reference to FIG. 5 according to the estimated timing. That is, the modulation scheme determination unit 38 estimates the timing at which the control signal of the neighboring base station arrives, and is applied together with the timing estimated by the modulation scheme based on the predicted SINR that anticipates an increase in the lower limit of the dynamic range.
- the modulation method may be determined.
- the demodulation error of the communication signal due to the control signal to be performed can be reduced.
- the physical frame forming unit 40 stores transmission data input from an upper layer (not shown) in a physical frame corresponding to a communication signal (for example, EXCH), and outputs the physical frame to the modulation unit 42.
- the physical frame forming unit 40 transmits a modulation scheme request (MR) including the modulation scheme (MCS) determined by the modulation scheme determination unit 38 to a physical frame corresponding to a predetermined uplink communication signal (for example, ANCH (Anchor Channel)).
- MR modulation scheme request
- MCS modulation scheme
- ANCH Anchor Channel
- the modulation unit 42 includes a serial-parallel converter, an IFFT (Inverse Fourier Transform) operation unit, a parallel-serial converter, and a D / A converter.
- the modulation unit 42 performs symbol mapping (assignment of amplitude and phase) on the physical frame input from the physical frame formation unit 40 according to the modulation scheme determined by the modulation scheme determination unit 38, and converts the complex symbol sequence into obtain. Then, the modulation unit 42 performs serial-parallel conversion, inverse discrete Fourier transform, parallel-serial conversion, D / A conversion, and the like on each carrier component of the obtained complex symbol sequence to obtain a baseband OFDM signal.
- the baseband OFDM signal acquired in this way is output to the wireless communication unit 22 after the GI is added.
- the mobile station 12 when the base station 14 transmits a control signal and a communication signal to the mobile station 12 (S100), the mobile station 12 receives a reception signal of a radio signal received together with the control signal and the communication signal. Is controlled so that the maximum received power of the signal (the received power of the control signal coming from the neighboring base station) becomes the upper limit of the dynamic range (S102).
- the mobile station 12 detects the received power difference between the received power of the control signal of the base station 14 and the received power of the control signal of the neighboring base station based on the received signal after the received power control (S104). Also, the mobile station 12 calculates the SINR of the communication signal based on the received signal after the received power control, and adds the received power difference (negative value) detected in S104 to the SINR as the predicted SINR. Calculate (S106). Then, the mobile station 12 selects the best modulation scheme applicable with this predicted SINR from the required SINR table and determines it as the modulation scheme (MCS) to be notified to the base station 14 (S108). The modulation scheme thus determined is stored in the modulation scheme request (MR) and transmitted to the base station 14 (S110).
- MCS modulation scheme request
- the base station 14 that has received the modulation scheme request from the mobile station 12 transmits a physical frame storing transmission data addressed to the mobile station 12 to a modulation scheme specified in the modulation scheme request or a lower required SINR than the modulation scheme. Modulation is performed by the modulation method, and a communication signal including the modulated physical frame and a modulation method identifier (MI: MCR Indicator) indicating the modulation method used for modulation of the physical frame is transmitted to the mobile station 12 (S112).
- MI MCR Indicator
- the mobile station 12 receives not only the SINR of the communication signal transmitted from the base station 14 but also the received power of the control signal transmitted from the base station 14 and the adjacent base station of the base station 14. Based on the received power difference from the received power of the control signal transmitted periodically, a modulation method for a new communication signal transmitted from the base station 14 is determined. For this reason, the demodulation error of the communication signal resulting from the control signal periodically transmitted from the adjacent base station can be reduced.
- the maximum received power of the signal transmitted from the base station 14 is the received power of the control signal, but the maximum received power of the signal transmitted from the base station 14 is other than the control signal.
- the received power of the signal (for example, communication signal) may be used.
- control signal transmitted periodically from an adjacent base station was illustrated as a strong input signal which has strong power exceeding the maximum received power of the signal transmitted from the base station 14, strong input
- the signal may be another signal that arrives periodically or aperiodically from a device other than the neighboring base station.
- the strong input signal characteristic detection unit 32 detects the frequency at which the maximum received power of a signal arriving from a device different from the base station 14 exceeds the maximum received power of a signal transmitted from the base station 14, and determines the modulation method.
- the unit 38 may determine a new communication signal modulation method based further on the frequency detected by the strong input signal characteristic detection unit 32.
- the modulation scheme determination unit 38 may determine a modulation scheme for a new communication signal based on whether or not the frequency detected by the strong input signal characteristic detection unit 32 is equal to or higher than a predetermined value. By so doing, it is possible to suitably reduce communication signal demodulation errors caused by strong input signals coming from a device different from the base station 14 at a certain frequency.
- the modulation scheme determining unit 38 is based on the received power difference detected by the received power difference detecting unit 30 under the condition that the strong input signal continuously arrives at the frequency detected by the strong input signal characteristic detecting unit 32.
- the estimated throughput when the modulation scheme determined without being applied is compared with the estimated throughput when the modulation scheme determined based on the received power difference is applied, and based on the comparison result, It may be determined whether the modulation scheme needs to be changed so that the throughput is increased.
- the present invention can be widely applied not only to mobile stations but also to receivers for wireless communication systems that employ adaptive modulation and OFDMA.
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Claims (8)
- 直交周波数分割多元接続方式によるサブチャネルの少なくとも1つを介して送信装置から送信される通信信号の受信電力を、該通信信号とともに前記サブチャネルのいずれかで受信される信号の最大受信電力に応じて制御する受信電力制御手段と、
前記受信電力制御手段により受信電力が制御された前記通信信号の信号品質に基づいて、前記送信装置から送信される新たな通信信号の変調方式を決定する変調方式決定手段と、
を含み、前記変調方式決定手段により決定された変調方式を用いて前記新たな通信信号を送信するよう前記送信装置に要求する受信装置であって、
前記送信装置から送信される信号の最大受信電力と、前記送信装置とは異なる装置から到来する信号の最大受信電力と、の受信電力差を検出する受信電力差検出手段をさらに含み、
前記変調方式決定手段は、前記受信電力差検出手段により検出された受信電力差にさらに基づいて、前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 請求項1に記載の受信装置において、
前記送信装置とは異なる装置から到来する信号の最大受信電力が、前記送信装置から送信される信号の最大受信電力を超える周期を検出する周期検出手段をさらに含み、
前記変調方式決定手段は、前記周期検出手段により検出された周期にさらに基づいて、前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 請求項2に記載の受信装置において、
前記変調方式決定手段は、前記周期検出手段により検出された周期に対応するタイミングで、前記受信電力差検出手段により検出された受信電力差に基づく前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 請求項2に記載の受信装置において、
前記周期検出手段は、前記送信装置に近接する近接送信装置から送信される制御信号の受信電力が、前記送信装置から送信される制御信号の受信電力を超える周期を検出し、
前記受信電力差検出手段は、前記送信装置から送信される制御信号の受信電力と、前記近接送信装置から送信される制御信号の受信電力と、の受信電力差を検出する、
ことを特徴とする受信装置。 - 請求項1に記載の受信装置において、
前記送信装置とは異なる装置から到来する信号の最大受信電力が、前記送信装置から送信される信号の最大受信電力を超える頻度を検出する頻度検出手段をさらに含み、
前記変調方式決定手段は、前記頻度検出手段により検出された頻度にさらに基づいて、前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 請求項5に記載の受信装置において、
前記変調方式決定手段は、前記頻度検出手段により検出された頻度が所定値以上であるか否かに基づいて、前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 請求項5に記載の受信装置において、
前記頻度検出手段により検出された頻度で、前記送信装置とは異なる装置から到来する信号の最大受信電力が前記送信装置から送信される信号の最大受信電力を超えるという条件のもと、前記受信電力差に基づくことなく決定される変調方式が適用された場合の推定スループットと、前記受信電力差に基づいて決定される変調方式が適用された場合の推定スループットと、を比較する推定スループット比較手段をさらに含み、
前記変調方式決定手段は、前記推定スループット比較手段による比較結果に基づいて、前記新たな通信信号の変調方式を決定する、
ことを特徴とする受信装置。 - 直交周波数分割多元接続方式によるサブチャネルの少なくとも1つを介して送信装置から送信される通信信号の受信電力を、該通信信号とともに前記サブチャネルのいずれかで受信される信号の最大受信電力に応じて制御するステップと、
前記送信装置から送信される信号の最大受信電力と、前記送信装置とは異なる装置から到来する信号の最大受信電力と、の受信電力差を検出するステップと、
受信電力が制御された前記通信信号の信号品質と、前記検出された受信電力差と、に基づいて、前記送信装置から送信される新たな通信信号の変調方式を決定するステップと、
前記送信装置に前記決定された変調方式を用いて前記新たな通信信号を送信させるステップと、
を含むことを特徴とする適応変調方法。
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CN2009801192453A CN102047625A (zh) | 2008-05-28 | 2009-05-28 | 接收装置以及自适应调制方法 |
US12/993,808 US8599942B2 (en) | 2008-05-28 | 2009-05-28 | Receiving device and adaptive modulation method |
KR1020107029273A KR101148974B1 (ko) | 2008-05-28 | 2009-05-28 | 수신장치 및 적응 변조방법 |
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JP2008139691A JP4920010B2 (ja) | 2008-05-28 | 2008-05-28 | 受信装置および適応変調方法 |
JP2008-139691 | 2008-05-28 |
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JP (1) | JP4920010B2 (ja) |
KR (1) | KR101148974B1 (ja) |
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KR20100138838A (ko) * | 2009-06-24 | 2010-12-31 | 엘지전자 주식회사 | 광대역 무선 접속 시스템에서 변조 및 부호화 기법 결정 방법 |
CN102271354A (zh) * | 2010-06-02 | 2011-12-07 | 中兴通讯股份有限公司 | Lte系统中的链路自适应方法、基站和终端 |
GB2492123B (en) * | 2011-06-22 | 2013-06-12 | Renesas Mobile Corp | Method, apparatus and computer program for setting a radio frequency gain |
US9191905B2 (en) * | 2011-06-22 | 2015-11-17 | Broadcom Corporation | Method, apparatus and computer readable medium for setting a radio frequency gain |
JP5840436B2 (ja) * | 2011-09-28 | 2016-01-06 | 京セラ株式会社 | 通信装置および通信制御方法 |
US10420038B2 (en) * | 2015-11-05 | 2019-09-17 | Intel IP Corporation | Transmit power control for uplink transmissions |
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JP2005318533A (ja) * | 2004-03-29 | 2005-11-10 | Matsushita Electric Ind Co Ltd | 通信装置及び通信方法 |
JP2007281780A (ja) * | 2006-04-05 | 2007-10-25 | Sharp Corp | 適応変調制御装置、通信装置、及び、適応変調制御方法 |
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CN102047625A (zh) | 2011-05-04 |
KR20110028301A (ko) | 2011-03-17 |
US20110069786A1 (en) | 2011-03-24 |
KR101148974B1 (ko) | 2012-05-23 |
US8599942B2 (en) | 2013-12-03 |
JP4920010B2 (ja) | 2012-04-18 |
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