WO2023032159A1 - 無線通信システム、無線通信方法、および無線通信用送信装置 - Google Patents
無線通信システム、無線通信方法、および無線通信用送信装置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- This disclosure relates to a wireless communication system, a wireless communication method, and a wireless communication transmitting device, and more particularly to a wireless communication system, a wireless communication method, and a wireless communication transmitting device using a quadrature amplitude modulation scheme.
- Non-Patent Document 1 discloses a technology related to a wireless communication system using a quadrature amplitude modulation (QAM) system.
- QAM quadrature amplitude modulation
- a transmission signal amplifier generally exhibits linear input/output characteristics in a region where the input power is small, but exhibits nonlinear characteristics in a region where the power is large. Therefore, in wireless communication, the higher the transmission power, the more likely the transmission signal is distorted.
- transmission signals emitted from a transmission device form a constellation that is regularly arranged in a grid pattern if there is no distortion.
- the receiver then identifies the received signal as forming such a regular constellation.
- Non-Patent Document 1 discloses a technique for keeping the transmission power within the linear region of the amplifier in order to avoid the influence of such distortion. If the transmission signal is within the linear region of the amplifier, no distortion is superimposed on the transmission signal. Therefore, according to the technique described in Non-Patent Document 1, it is possible to cause the receiving apparatus to always correctly process the signal, and to effectively prevent misidentification of data.
- Non-Patent Document 1 solves the problem of distortion by abandoning the use of the nonlinear region of the amplifier. In other words, with this technique, the amplifier cannot fully demonstrate its inherent ability, and a situation arises that goes against the essential demand of using large power without excessive capital investment.
- the present disclosure has been made in view of the above problems, and provides a wireless communication system that can effectively prevent misidentification of data while utilizing the nonlinear region of the amplifier in wireless communication using the QAM method. is the first objective.
- a second object of the present disclosure is to provide a wireless communication method for effectively preventing misidentification of data while utilizing the nonlinear region of an amplifier in wireless communication using the QAM system.
- a third object of the present disclosure is to provide a wireless communication transmitter capable of effectively preventing misidentification of data while utilizing the nonlinear region of an amplifier in wireless communication using the QAM system.
- a first aspect is a wireless communication system including a transmitting device and a receiving device that perform wireless communication using a quadrature amplitude modulation method
- the transmitting device a transmission signal amplifier with variable transmission power; a transmission power control unit that controls transmission power used by the transmission signal amplifier; pattern information of an approximate constellation obtained by approximately arranging each of the signal points included in the normal constellation of the quadrature amplitude modulation on any of a predetermined number of concentric circles, based on the transmission power; an approximate pattern information notification unit to be generated; an information bit generator that generates information bits so that the pattern information is transmitted prior to the data signal;
- the receiving device includes a likelihood calculation unit that calculates the likelihood of reception points indicated by the data signal using an approximate constellation corresponding to the pattern information.
- a second aspect is a wireless communication method using a transmitting device and a receiving device that perform wireless communication using a quadrature amplitude modulation method
- the transmission device comprises a transmission signal amplifier with variable transmission power, controlling the transmit power used by the transmit signal amplifier; pattern information of an approximate constellation obtained by approximately arranging each of the signal points included in the normal constellation of the quadrature amplitude modulation on any of a predetermined number of concentric circles, based on the transmission power; a generated approximate pattern information notification step; transmitting the pattern information to the receiving device prior to a data signal; a likelihood calculation step in which the receiving device calculates the likelihood of reception points indicated by the data signal using an approximate constellation corresponding to the pattern information; should be included.
- a third aspect is a radio communication transmitting device that performs radio communication with a receiving device using a quadrature amplitude modulation method, a transmission signal amplifier with variable transmission power; a transmission power control unit that controls transmission power used by the transmission signal amplifier; pattern information of an approximate constellation obtained by approximately arranging each of the signal points included in the normal constellation of the quadrature amplitude modulation on any of a predetermined number of concentric circles, based on the transmission power; an approximate pattern information notification unit to be generated; an information bit generator for generating information bits such that the pattern information is transmitted prior to the data signal; It is desirable to have
- FIG. 1 is a diagram for explaining the overall configuration of a radio communication system according to Embodiment 1 of the present disclosure
- FIG. FIG. 2 is a diagram for explaining the configuration of a transmission device to be compared with the transmission device according to Embodiment 1 of the present disclosure
- FIG. 4 is a diagram showing input/output characteristics of an amplifier built into the transmission device
- FIG. 4 is a diagram showing how distortion occurs in a constellation as transmission power increases.
- 2 is a block diagram for explaining the configuration of a transmission device according to Embodiment 1 of the present disclosure
- FIG. FIG. 4 is a diagram showing a distorted constellation and an approximate constellation in comparison
- 1 is a block diagram for explaining the configuration of a receiving device according to Embodiment 1 of the present disclosure
- FIG. 4 is a flowchart for explaining the flow of processing executed by an approximate pattern information notifying unit of the transmitting device in Embodiment 1 of the present disclosure
- FIG. 4 is a flowchart for explaining the flow of processing executed by a likelihood calculation unit of the receiving device in Embodiment 1 of the present disclosure
- FIG. 4 is a flowchart for explaining the flow of processing executed by a likelihood calculation unit of the receiving device in Embodiment 1 of the present disclosure
- FIG. 1 shows the overall configuration of a radio communication system according to Embodiment 1 of the present disclosure.
- the wireless communication system of this embodiment includes a transmitter 10 and a receiver 12 .
- the transmitting device 10 is configured by, for example, a mobile communication base station operated by a communication carrier, or a WiFi (registered trademark) access point.
- the receiving device 12 is configured by a terminal station such as a smart phone or a tablet terminal.
- FIG. 2 is a block diagram for explaining the configuration of the transmission device 14 to be compared with the transmission device 10 in this embodiment.
- the transmission device 14 of the comparative example includes an information bit generator 16 .
- the information bit generator 16 generates information bits to be transmitted to the receiver 12 .
- the information bit generator 16 may have an error correction coding function or an interleaving function.
- the information bits generated by the information bit generator 16 are provided to the data signal modulator 18 .
- the data signal modulator 18 modulates the provided information bits into a data signal.
- Quadrature amplitude modulation (QAM) is used as the modulation method.
- the data signal generated by the data signal modulating section 18 is provided to the digital-to-analog converting section 20 .
- the digital-to-analog converter 20 converts the digital-modulated data signal into an analog transmission signal.
- the transmission signal generated by the digital-to-analog converter 20 is provided to the transmission signal amplifier 22 .
- the transmission signal amplifier 22 amplifies the transmission signal and provides it to the antenna 24 . Then, the transmission signal is transmitted from the antenna 24 toward the receiving device 12 in the form of a radio signal.
- FIG. 3 shows the input/output characteristics of the transmission signal amplifier 22.
- the output power (vertical axis) of the transmission signal amplifier 22 is proportional to the input power in a region where the input power (horizontal axis) is smaller than PB . Then, in the region where the input power exceeds PB , the proportional relationship is lost.
- a region in which the two are in a proportional relationship will be referred to as a "linear region”
- a region in which the proportional relationship between the two will be lost will be referred to as a "nonlinear region”.
- 64 symbols arranged in a lattice are defined by changing and adjusting the amplitudes of two mutually independent carriers.
- a point on the constellation coordinates where each of these 64 symbols is defined is hereinafter referred to as a "signal point”.
- a point on the constellation coordinates of each data signal that is actually transmitted is called a "receiving point”.
- reception points form a distortion-free constellation as shown on the left side of FIG. 4 (transmission power P 1 ).
- distortion is superimposed on the constellation at the reception point, as shown on the right side of FIG. 4 (transmission power P N ).
- a constellation without distortion is hereinafter referred to as a “regular constellation”.
- a constellation with distortion is called a "distorted constellation”.
- the receiving device 12 calculates the likelihood of each reception point included in the transmission signal with respect to signal points existing in the vicinity, and based on the result, treats each reception point as one of 64 symbols. recognize.
- the likelihood calculation can be performed, for example, by the method described in the following document.
- the receiving device 12 When the receiving device 12 performs likelihood calculation using the signal points of the normal constellation, the receiving points generated in the linear domain are correctly recognized. However, the reception points generated in the nonlinear region are deviated from their normal positions. Therefore, receiving apparatus 12 that calculates likelihood using a normal constellation cannot correctly calculate likelihood for reception points generated in a nonlinear region. As a result, misidentification of data may occur in the receiving device 12 .
- Input/output characteristics such as those shown in FIG.
- the distortion superimposed on the constellation can be estimated as a function of the transmission power. Therefore, in the transmission device 14, when the transmission power used for communication is determined, it is possible to estimate the distortion constellation corresponding to the transmission power.
- the receiver 12 uses the distortion constellation to Correct likelihood calculations can be performed. Moreover, according to such processing, it is also possible to fully utilize the amplification capability of the transmission signal amplifier 22 .
- the radio communication system of the present embodiment replaces the distorted constellation with an approximated constellation with a smaller amount of information and provides it to the receiving device 12 .
- the manner in which the system of the present invention uses approximate constellations is described in detail below.
- FIG. 5 is a block diagram of the transmission device 10 of this embodiment.
- the same elements as those of the transmitting device 14 of the comparative example are denoted by the same reference numerals, and description thereof will be omitted or simplified.
- the transmission device 10 has a transmission power control section 26 in front of the transmission signal amplifier 22 .
- the transmission power control section 26 controls transmission power used by the transmission signal amplifier 22 so as to obtain desired communication quality.
- a control command from the transmission power control section 26 is provided to the transmission signal amplifier 22 and the approximate pattern information notification section 28 .
- the approximate pattern information notification section 28 notifies the information bit generation section 30 to that effect. Also, when the transmission power belongs to the nonlinear region of the transmission signal amplifier 22, pattern information representing an approximate constellation of the distortion constellation corresponding to the transmission power is generated. This pattern information is provided to the information bit generator 30 .
- the information bit generation unit 30 has the same function as the information bit generation unit 16 provided in the transmission device 14 of the comparative example, and also has a function of converting the information provided from the approximate pattern information notification unit 28 into bits. That is, it has a function of converting information indicating that the transmission power belongs to the linear region and pattern information of the approximate constellation into bits. This information is hereinafter referred to as "constellation information".
- the constellation information is transmitted prior to the data signal. Therefore, before receiving the data signal, the receiving device 12 can receive the approximate constellation information corresponding to the transmission power of the data signal.
- FIG. 6 shows a distorted constellation of 64QAM and its approximate constellation in comparison.
- the 64 signal points tend to become more dense as they move away from the center. Those signal points can then be grouped as lying on any of several concentric circles. More specifically, when the modulation scheme is 64QAM, the signal points of the distorted constellation can be approximated as being on any of the four concentric circles, similar to the 64APSK (Amplitude Phase Shift Keying) constellation. .
- the approximate constellation shown on the right side of FIG. 6 was obtained as a result of grouping the 64 signal points as if they were on any of the four concentric circles. To transmit all of the signal points contained in the distorted constellation, it is necessary to define the radius and phase, or X, Y coordinates, for all 64 signal points. On the other hand, as for the approximate constellation, it is possible to share radius information for a plurality of signal points on the same concentric circle. Therefore, the amount of information representing the approximate constellation is small compared to the amount of information representing the distorted constellation.
- the approximate pattern information notification unit 28 when transmission power belonging to a nonlinear region is used, the approximate pattern information notification unit 28 first generates a distortion constellation as shown on the left side of FIG. 6 based on the transmission power. Next, an approximate constellation is generated by approximating the signal points included in the distorted constellation as belonging to one of four concentric circles. Then, the information of the approximate constellation is converted into bits by the information bit generator 30 and then transmitted to the receiving device 12 .
- FIG. 7 is a block diagram for explaining the configuration of the receiving device 12.
- the receiving device 12 has an antenna 32 for exchanging radio signals with the transmitting device 10 .
- a signal received by the antenna 32 is provided to the received signal amplifier 34 .
- the received signal amplifier 34 amplifies the received signal with an appropriate gain and provides it to the analog-to-digital converter 36 .
- the analog-to-digital converter 36 is a block for demodulating the received signal in analog form into a digital signal.
- the signal digitized by the analog-to-digital converter 36 is provided to the data signal equalizer 38 .
- the data signal equalization unit 38 is a block that obtains an estimated value of the received signal by back-calculating the amplitude and phase information of the channel response.
- a training signal is exchanged between the transmitting device 10 and the receiving device 12 prior to the data signal.
- the content of the training signal is shared in advance between the transmitting device 10 and the receiving device 12 . Therefore, the receiving device 12 can detect the influence caused by the communication channel based on the actually received training signal.
- the data signal equalization unit 38 reflects the result of the training on the data signal received by the receiving device 12, thereby generating a data signal that cancels out the influence caused by the communication channel.
- the data signal generated by the data signal equalization section 38 is provided to the likelihood calculation section 40 .
- the likelihood calculation unit 40 calculates the likelihood of the reception points indicated by the data signal and some of the signal points on the constellation to be compared. Then, the signal point with the highest likelihood is recognized as the symbol intended by the current reception point.
- the likelihood calculation section 40 when the transmission power belongs to the linear region, the normal constellation is used as the constellation to be compared. Also, when the transmission power belongs to the nonlinear region, an approximate constellation is used as the constellation to be compared.
- the signal symbolized by the likelihood calculator 40 is provided to the information bit detector 42 .
- the information bit detector 42 detects received bits from the symbolized signal.
- the information bit detector 42 may have an error correction decoding function and an interleaving function as required.
- FIG. 8 is a flow chart for explaining the flow of processing executed by the approximate pattern information notification unit 28 of the transmission device 10. As shown in FIG. As shown in FIG. 8, in this routine, first, the transmission power set in the transmission power control section 26 is detected (step 100).
- step 102 it is determined whether or not the transmission power belongs to the linear region of the transmission signal amplifier 22 (step 102).
- the fact that the transmission signal belongs to the linear region is notified to the information bit generator 30 as constellation information under the linear region (step 104). This information is then sent to the receiving device 12 prior to the data signal.
- an approximate constellation simulating the APSK constellation is generated (step 106). Specifically, first, based on the specifications of the transmission signal amplifier 22, a distortion constellation corresponding to transmission power is generated. Signal points in the distorted constellation are then approximated as lying on any of a predetermined number of concentric circles.
- the signal points included in the approximate constellation are grouped on the same concentric circle. Then, as information common to the signal points belonging to each group, the radius of the concentric circles of each group is set. Further, the phase is set as information for each signal point (step 108).
- the group information of signal points, the radius information of each group, and the phase information of each signal point are provided to the information bit generator 30 as constellation information under the nonlinear region (step 110). ). This information is then sent to the receiving device 12 prior to the data signal.
- FIG. 9 is a flowchart for explaining the flow of processing executed by the likelihood calculation unit 40 of the receiving device 12. As shown in FIG. As shown in FIG. 9, in this routine, constellation information is first detected from the received signal (step 120).
- step 122 it is determined whether or not the detected constellation information is information under the linear region.
- a normal constellation is set as the constellation to be compared with the reception points when calculating the likelihood (step 124).
- the set constellation is used to perform likelihood calculation for the reception points (step 126). Under the condition that no distortion is superimposed on the reception point, the likelihood can be calculated correctly by using the normal constellation. Therefore, the receiving device 12 can correctly symbolize the reception points.
- step 122 If the constellation information under the nonlinear region has been received, the determination in step 122 above is denied. In this case, an approximate constellation is generated based on the received constellation information. Then, the approximate constellation is set as the constellation used for likelihood calculation (step 128).
- step 126 likelihood calculation is performed based on the approximate constellation instead of the normal constellation.
- the approximate constellation reflects the distortion superimposed on the reception points. Therefore, even if distortion is superimposed on the receiving point, the receiving device 12 can perform correct likelihood calculation and appropriately symbolize the receiving point.
- the receiving device 12 when the transmission power belongs to the linear region of the transmission signal amplifier 22, the receiving device 12 is caused to perform likelihood calculation using a normal constellation. As a result, correct transmission of data signals is achieved.
- the transmission power belongs to the nonlinear region of the transmission signal amplifier 22
- information on the approximate constellation can be provided to the receiving device 12.
- the approximate constellation reflects the influence of distortion superimposed on the reception points. Therefore, correct transmission of the data signal is realized even though the distortion is superimposed on the receiving point.
- the amount of information required to share the approximate constellation is less than the amount of information required to share the distorted constellation. Therefore, the amount of information that needs to be provided to the receiver 12 can be reduced compared to the case where the distorted constellation itself is provided to the receiver 12 . As a result, according to the present embodiment, it is possible to achieve appropriate data transmission while maintaining a high data rate while utilizing the amplification capability of the transmission signal amplifier 22 without waste.
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Abstract
Description
前記送信装置は、
送信電力が可変の送信信号増幅器と、
前記送信信号増幅器が用いる送信電力を制御する送信電力制御部と、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知部と、
前記パターン情報がデータ信号に先立って送信されるように情報ビットを生成する情報ビット生成部と、を備え、
前記受信装置は、前記パターン情報に対応する近似コンスタレーションを用いて、前記データ信号が示す受信点について尤度計算を行う尤度算出部を備えることが望ましい。
前記送信装置は、送信電力が可変の送信信号増幅器を備え、
前記送信信号増幅器が用いる送信電力を制御するステップと、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知ステップと、
前記パターン情報をデータ信号に先立って前記受信装置に向けて送信するステップと、
前記受信装置が、前記パターン情報に対応する近似コンスタレーションを用いて、前記データ信号が示す受信点について尤度計算を行う尤度算出ステップと、
を含むことが望ましい。
送信電力が可変の送信信号増幅器と、
前記送信信号増幅器が用いる送信電力を制御する送信電力制御部と、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知部と、
前記パターン情報がデータ信号に先立って送信されるように情報ビットを生成する情報ビット生成部と、
を備えることが望ましい。
[実施の形態1の全体構成]
図1は、本開示の実施の形態1の無線通信システムの全体構成を示す。図1に示すように、本実施形態の無線通信システムは、送信装置10と受信装置12を備えている。送信装置10は、例えば、通信事業者が運営する移動体通信の基地局、或いはWiFi(登録商標)のアクセスポイント等で構成される。また、受信装置12は、スマートフォンやタブレット端末等の端末局で構成される。
図2は、本実施形態における送信装置10と対比される比較対象の送信装置14の構成を説明するためのブロック図である。比較例の送信装置14は、情報ビット生成部16を備えている。情報ビット生成部16は、受信装置12に伝送したい情報ビットを生成する。情報ビット生成部16は、誤り訂正符号化機能、或いはインターリーブ機能を備えていてもよい。
図8は、送信装置10の近似パターン情報通知部28が実行する処理の流れを説明するためのフローチャートである。図8に示すように、このルーチンでは、先ず、送信電力制御部26において設定された送信電力が検知される(ステップ100)。
図9は、受信装置12の尤度算出部40が実行する処理の流れを説明するためのフローチャートである。図9に示すように、このルーチンでは、先ず、受信信号からコンスタレーション情報が検知される(ステップ120)。
ところで、上述した実施の形態1では、変調方式が64QAMである場合を説明したが、本開示はこれに限定されるものではない。即ち、本開示に適用可能な変調方式は64QAMに限定されるものではなく、256QAM等の他の変調方式を適用することも可能である。
12 受信装置
22 送信信号増幅器
26 送信電力制御部
28 近似パターン情報通知部
30 情報ビット生成部
40 尤度算出部
Claims (8)
- 直交振幅変調方式を用いて無線通信を行う送信装置と受信装置を含む無線通信システムであって、
前記送信装置は、
送信電力が可変の送信信号増幅器と、
前記送信信号増幅器が用いる送信電力を制御する送信電力制御部と、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知部と、
前記パターン情報がデータ信号に先立って送信されるように情報ビットを生成する情報ビット生成部と、を備え、
前記受信装置は、前記パターン情報に対応する近似コンスタレーションを用いて、前記データ信号が示す受信点について尤度計算を行う尤度算出部を備える無線通信システム。 - 前記近似パターン情報通知部は、
前記送信電力が、前記送信信号増幅器の非線形領域に属する場合に、前記近似コンスタレーションのパターン情報を生成し、
前記送信電力が、前記送信信号増幅器の線形領域に属する場合に、その状態を表す線形情報を生成するように構成されており、
前記情報ビット生成部は、前記パターン情報に代えて前記線形情報が生成された場合は、前記データ信号に先立って前記線形情報が送信されるように情報ビットを生成するように構成されており、
前記尤度算出部は、前記受信装置に向けて前記線形情報が送信されてきた場合は、前記正規コンスタレーションを用いて前記尤度計算を実行するように構成されている請求項1に記載の無線通信システム。 - 前記近似コンスタレーションのパターン情報は、
前記同心円の夫々の半径を表す情報と、
前記信号点の夫々が、前記同心円の何れに配置されているかを表す情報と、
前記信号点の夫々の前記近似コンスタレーション上での位相を表す情報と、
を含む請求項1または2に記載の無線通信システム。 - 前記直交振幅変調は、コンスタレーション上にn点の信号点が定義されるnQAMであり、前記近似コンスタレーションに含まれる同心円の数は、n点の信号点に対応するnAPSKのコンスタレーションが有する同心円の数と同じである請求項1乃至3の何れか1項に記載の無線通信システム。
- 直交振幅変調方式を用いて無線通信を行う送信装置と受信装置を用いる無線通信方法であって、
前記送信装置は、送信電力が可変の送信信号増幅器を備え、
前記送信信号増幅器が用いる送信電力を制御するステップと、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知ステップと、
前記パターン情報をデータ信号に先立って前記受信装置に向けて送信するステップと、
前記受信装置が、前記パターン情報に対応する近似コンスタレーションを用いて、前記データ信号が示す受信点について尤度計算を行う尤度算出ステップと、
を含む無線通信方法。 - 前記近似パターン情報通知ステップは、
前記送信電力が、前記送信信号増幅器の非線形領域に属する場合に、前記近似コンスタレーションのパターン情報を生成するステップと、
前記送信電力が、前記送信信号増幅器の線形領域に属する場合に、その状態を表す線形情報を生成するステップと、を含み、
前記尤度算出ステップは、前記受信装置に向けて、前記線形情報が送信されてきた場合は、前記正規コンスタレーションを用いて前記尤度計算を実行するステップを更に含む請求項5に記載の無線通信方法。 - 直交振幅変調方式を用いて受信装置と無線通信を行う無線通信用送信装置であって、
送信電力が可変の送信信号増幅器と、
前記送信信号増幅器が用いる送信電力を制御する送信電力制御部と、
前記直交振幅変調の正規コンスタレーションに含まれる信号点の夫々を、既定数の同心円の何れかの上に近似的に配置することで得られる近似コンスタレーションのパターン情報を、前記送信電力に基づいて生成する近似パターン情報通知部と、
前記パターン情報がデータ信号に先立って送信されるように情報ビットを生成する情報ビット生成部と、
を備える無線通信用送信装置。 - 前記近似パターン情報通知部は、
前記送信電力が、前記送信信号増幅器の非線形領域に属する場合に、前記近似コンスタレーションのパターン情報を生成し、
前記送信電力が、前記送信信号増幅器の線形領域に属する場合に、その状態を表す線形情報を生成するように構成されており、
前記情報ビット生成部は、前記パターン情報に代えて前記線形情報が生成された場合は、前記データ信号に先立って前記線形情報が送信されるように情報ビットを生成するように構成されている請求項7に記載の無線通信用送信装置。
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