CN101035107A - Radio communication apparatus - Google Patents

Radio communication apparatus Download PDF

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Publication number
CN101035107A
CN101035107A CN 200710087756 CN200710087756A CN101035107A CN 101035107 A CN101035107 A CN 101035107A CN 200710087756 CN200710087756 CN 200710087756 CN 200710087756 A CN200710087756 A CN 200710087756A CN 101035107 A CN101035107 A CN 101035107A
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China
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signal
unit
modulation system
orthogonal baseband
modulation
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Inventor
村上豐
高林真一郎
安倍克明
折橋雅之
松岡昭彥
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Panasonic Intellectual Property Corp of America
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Matsushita Electric Industrial Co Ltd
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Abstract

In a radio communication method whereby adaptive modulation is performed, a method is used whereby pilot symbol signal points are arranged in the in-phase-quadrature plane (IQ plane) so that the reception sensitivity of a receiving apparatus is made optimal in the respective modulation methods while maintaining the average transmission output power of the transmitting apparatus at a fixed level. By this means, it is possible to arrange pilot symbol signal points and improve the reception sensitivity characteristics of a receiving apparatus while maintaining the average transmission output power of the transmitting apparatus at a fixed level.

Description

Radio communication device
The application be that October 22 calendar year 2001, application number are 01135804.1 the applying date, denomination of invention divides an application for the patent application of " radio communication device ".
Technical field
The present invention relates to use the radio communication device of digital modulation mode.
Background technology
In the digital mobile radio communication mode, the signal transmitting and receiving between base station apparatus, communication terminal can be influenced by radio propagation environment, and radio propagation environment is influential to the quality of reception and the receiving sensitivity characteristic of receiver side.Therefore, in the past as making receiving system improve the method for receiving sensitivity characteristic by effort, put down in writing the relevant method of pilot frequency code element signal point position when carrying out quasi-synchronous detection among three bottles in document (land mobile with the decline distortion compensation mode of 16QAM), the collection of thesis B-II Vol.J-72-B-II No.1 pp.7-15 of electronic intelligence Communications Society (in January, 1989) to the pilot frequency code element signal point position.Fig. 1 illustrates the signaling point configuration of middle 16QAM (quadrature amplitude modulation) code element of homophase-orthogonal plane (IQ plane) and pilot frequency code element.As everyone knows, the signaling point of 16QAM in the label 3501 expression IQ planes among Fig. 1, and the pilot frequency code element signaling point is configured in certain in label 3502, label 3503, label 3504 and the label 3505, like this with the signaling point that has peak swing in the middle of the 16QAM signaling point as pilot signal, carry out this mode of quasi-synchronous detection.
In the but existing pilot frequency code element configuration, to obtain the signaling point of peak signal point amplitude in the middle of the signaling point in the modulation system as the pilot frequency code element signaling point, but consider the receiving sensitivity of receiving system, this is as the not necessarily best position of pilot frequency code element signaling point.And, for making the transmitted power of dispensing device, the receiving sensitivity characteristic that improves receiving system increases, and peak signal point amplitude shown in Figure 1 is increased, be nothing but that the whole code elements that send are all increased transmitted power, the dispensing device power consumption is increased.
Summary of the invention
Its purpose of the present invention is, makes the average transmitting power of dispensing device remain a certain firm power level and disposes the pilot frequency code element signaling point, and improve the receiving sensitivity characteristic of receiving system.
A kind of radio communication device of the 1st aspect according to the present invention has a plurality of signals that generate digital orthogonal baseband signal with mutually different modulation systems and generates parts, generates in the middle of the signal of parts output the switching part of select target signal only from described a plurality of signals, the selected digital orthogonal baseband signal of described switching part is stipulated the radio parts of wireless processing and the power amplification parts that the transmission signal of described radio parts output is carried out power amplification; The amplitude that described signal generation parts call the signaling point of code element to separating in the described digital orthogonal baseband signal is adjusted, and the amplitude of described signaling point is become at the minimum signaling point amplitude in the signaling point amplitude of desirable carrier power to noise power ratio that satisfies the error ratio characteristic of stipulating, the average transmission power output of the transmission signal of described each modulation system in the described power amplification parts is equated mutually, and the amplitude that makes described signaling point is no more than the signaling point amplitude of the working range of the modulation system that has wide operating range in the working range of described power amplification parts.
A kind of radio communication device of the 2nd aspect according to the present invention has a plurality of signals generation parts that generate serial signal with different mutually modulation systems, generate in the middle of the serial signal of parts output the only switching part of select target signal from described a plurality of signals, the serial signal of described switching part output is transformed to the serial parallel transformation parts of parallel signal, to the disperse discrete inverse Fourier transform parts of inverse Fourier transform of the parallel signal through the serial parallel transformation, to stipulating the radio parts of wireless processing through the signal of discrete inverse Fourier transform, and the power amplification parts that the transmission signal of described radio parts output is carried out power amplification; The amplitude that described signal generation parts call the signaling point of code element to separating in the described digital orthogonal baseband signal is adjusted, and makes the amplitude of described signaling point become minimum signaling point amplitude in the signaling point amplitude of desirable carrier power to noise power ratio of the error ratio characteristic that satisfies regulation, the average transmission power output of the transmission signal of described each modulation system in the described power amplification parts is equated mutually, and the amplitude that makes described signaling point is no more than the signaling point amplitude of the working range of the modulation system that has wide operating range in the working range of described power amplification parts.
A kind of radio communication device of the 3rd aspect according to the present invention, ratio deduction transmission path distortion with the signaling point amplitude that calls code element with the receiving-member of code element, according to separating of receiving from the described radio communication device receiving demodulation in the present invention the 1st aspect and each modulation system peak signal point amplitude, generate transmission path distortion and infer the distortion deduction parts of signal, determine corrected value according to the signaling point amplitude that calls code element of separating that receives with the ratio of each modulation system peak signal point amplitude, described transmission path distortion is inferred the correcting unit of signal times with described corrected value.
The present invention, by in the communication that carries out Adaptive Modulation, take to make the average transmitting power of dispensing device remain a certain firm power level make receiving sensitivity the best of receiving system simultaneously, like this in this mode of homophase-orthogonal plane (IQ plane) configuration pilot frequency code element signaling point, achieve the above object.
Description of drawings
Fig. 1 is IQ plane 16QAM code element and pilot frequency code element signaling point allocation plan.
A routine frame that Figure 2 shows that the invention process form 1 constitutes.
The block diagram that Fig. 3 constitutes for expression the invention process form 1 dispensing device.
The block diagram that Fig. 4 constitutes for expression the invention process form 1 receiving system.
Fig. 5 is the input/output relation figure of existing transmitted power amplifying unit.
Fig. 6 is the IQ plane QPSK code element and the pilot frequency code element signaling point allocation plan of the invention process form 1.
Fig. 7 is the IQ plane 16QAM code element and the pilot frequency code element signaling point allocation plan of the invention process form 1.
Fig. 8 is the input/output relation figure of two kinds of transmitted power amplifying units of the invention process form 1.
Fig. 9 is the input/output relation figure of the transmitted power amplifying unit of the invention process form 1.
Figure 10 is that the power ratio of the pilot frequency code element of QPSK modulation in the invention process form 1 and signaling point is with respect to bit error rate 10 -4, 10 -6The curve chart of required hope carrier power and the ratio of noise power.
Figure 11 is for representing the block diagram of its formation of dispensing device that the invention process form 1 is amplified jointly.
Figure 12 shows that the formation of the invention process form 2 one routine communication terminal signal transmitted frames.
The block diagram that Figure 13 constitutes for receiving system in the base station of expression the invention process form 2.
Figure 14 shows that the formation of the invention process form 2 one routine base station signal transmitted frames.
The block diagram that Figure 15 constitutes for dispensing device in the communication terminal of expression the invention process form 2.
The block diagram that Figure 16 constitutes for receiving system in the communication terminal of expression the invention process form 2.
Figure 17 shows that the formation of the invention process form 3 one routine CDMA mode base station signal transmitted frames.
The block diagram that Figure 18 constitutes for dispensing device in the CDMA mode base station of expression the invention process form 3.
The block diagram that Figure 19 constitutes for receiving system in the CDMA mode base station of expression the invention process form 3.
Figure 20 shows that the formation of the invention process form 3 one routine CDMA mode communication terminal signal transmitted frames.
The block diagram that Figure 21 constitutes for dispensing device in the CDMA mode communication terminal of expression the invention process form 3.
The block diagram that Figure 22 constitutes for receiving system in the CDMA mode communication terminal of expression the invention process form 3.
The block diagram that Figure 23 constitutes for receiving system in the base station of expression the invention process form 4.
Shown in Figure 24 is that the invention process form 5 one routine frames constitute.
Figure 25 is the IQ plane QPSK code element and the pilot frequency code element signaling point allocation plan of the invention process form 5.
Figure 26 is the IQ plane 16QAM code element and the pilot frequency code element signaling point allocation plan of the invention process form 5.
Figure 27 is the IQ plane 64QAM symbol signal point allocation plan of the invention process form 5.
Figure 28 is the dispensing device pie graph of the invention process form 5.
Figure 29 is the block diagram of the digital orthogonal baseband signal generation unit formation of expression the invention process form 5.
Figure 30 is the receiving system pie graph of the invention process form 5.
Shown in Figure 31 is the formation of the invention process form 6 one routine base station signal transmitted frames.
The block diagram that Figure 32 constitutes for dispensing device in the base station of expression the invention process form 6.
The block diagram that Figure 33 constitutes for receiving system in the communication terminal of expression the invention process form 6.
Figure 34 is the inner block diagram that constitutes of modulating unit of expression the invention process form 6.
The block diagram that Figure 35 constitutes for dispensing device in the base station of expression the invention process form 6.
Figure 36 is the input/output relation figure of the transmitted power amplifying unit of the invention process form 7.
But Figure 37 is for representing the concept map of base station communication range with regard to each modulation system.
Embodiment
Specify the invention process form with reference to the accompanying drawings.
(example 1)
A routine frame that Figure 2 shows that this example constitutes.Following modulation system is combined as the example explanation for three kinds with QPSK (Quadrature Phase Shift Keying), 16QAM and 64QAM.
Among Fig. 2, header 101, pilot frequency code element 103 and unique word 104 are control information, and header 101 comprises this information of selected modulation system, comprises expression QPSK, 16QAM and one of them this information of 64QAM.Data symbols 102 comprises data message.Pilot frequency code element 103 is used for carrying out the electric wave transmission environment and infers or synchronous detection that unique word 104 is obtained the signal of using with the dispensing device time synchronized for receiving system.In addition, these control informations need have more reliability than data symbols.
Fig. 3 represents that this example dispensing device constitutes.Among Fig. 3, QPSK signal generation unit 201, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is QPSK, frame according to Fig. 1 constitutes the generation digital orthogonal baseband signal, QPSK digital orthogonal baseband signal in-phase component is exported to in-phase component switch unit 204, and QPSK digital orthogonal baseband signal quadrature component is exported to quadrature component switch unit 205.
16QAM signal generation unit 202, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is 16QAM, frame according to Fig. 1 constitutes the generation digital orthogonal baseband signal, 16QAM digital orthogonal baseband signal in-phase component is exported to in-phase component switch unit 204, and 16QAM digital orthogonal baseband signal quadrature component is exported to quadrature component switch unit 205.
64QAM signal generation unit 203, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is 64QAM, frame according to Fig. 1 constitutes the generation digital orthogonal baseband signal, 64QAM digital orthogonal baseband signal in-phase component is exported to in-phase component switch unit 204, and 64QAM digital orthogonal baseband signal quadrature component is exported to quadrature component switch unit 205.
In-phase component switch unit 204, according to QPSK with signal generation unit 201, the 16QAM modulation system information that control signal comprised in the middle of the control signal with signal generation unit 203 one of them the digital orthogonal baseband signal in-phase component imported and the input of other paths with signal generation unit 202 and 64QAM, the importation is switched, so that import the digital orthogonal baseband signal in-phase component of specified modulation mode, and the digital orthogonal baseband signal in-phase component of being imported is exported to radio-cell 206.
Quadrature component switch unit 205, according to QPSK with signal generation unit 201, the 16QAM modulation system information that control signal comprised in the middle of the control signal with signal generation unit 203 one of them the digital orthogonal baseband signal quadrature component imported and the input of other paths with signal generation unit 202 and 64QAM, the importation is switched, so that import the transmission digital orthogonal baseband signal quadrature component of specified modulation mode, and the digital orthogonal baseband signal quadrature component of being imported is exported to radio-cell 206.
Radio-cell 206 is exported to transmitted power amplifying unit 207 after the wireless processing that the positive baseband signal quadrature component of transmission quadrature of the transmission digital orthogonal baseband signal in-phase component of in-phase component switch unit 204 output and 205 outputs of quadrature component switch unit is stipulated.Transmitted power amplifying unit 207 amplifies the signal through radio-cell 206 wireless processing, and amplified transmission signal is sent by transmitting antenna 208.
Fig. 4 illustrates this example receiving system and constitutes.Among Fig. 4,302 pairs of wireless processing of stipulating by the signals (received signal) of reception antenna 301 receptions of reception radio-cell will receive the digital orthogonal baseband signal in-phase component and receive the digital orthogonal baseband signal quadrature component and export to synchronous modulation mode judging unit 303, decline distortion deduction unit 304, frequency shift (FS) deduction unit 305, QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
Synchronous modulation mode judging unit 303, according to the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs with receive the digital orthogonal baseband signal quadrature component and detect unique word among Fig. 2, obtain time synchronized with dispensing device according to the unique word that is detected.And, also detect header, the identification modulation system information that header comprised.The control signal that will comprise these two information is exported to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
Unit 304 is inferred in the decline distortion, control signal with the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and reception digital orthogonal baseband signal quadrature component and 303 outputs of synchronous modulation mode judging unit, infer the distortion that decline causes according to pilot frequency code element among Fig. 2, the distortion that will decline deduction signal is exported to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
Unit 305 is inferred in frequency shift (FS), control signal with the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and quadrature component and 303 outputs of synchronous modulation mode judging unit, infer frequency shift (FS) according to pilot frequency code element among Fig. 2, frequency shift (FS) is inferred that signal exports to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
QPSK detection unit 306, when the modulation system information representation QPSK that control signal comprised of synchronous modulation mode judging unit 303 outputs, infer the frequency shift (FS) deduction signal of signal and 305 outputs of frequency shift (FS) deduction unit with the decline distortion of decline distortion deduction unit 304 outputs, carry out demodulation, output QPSK receiving digital signals after removing the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and receiving decline distortion in the digital orthogonal baseband signal quadrature component, frequency shift (FS).
16QAM detection unit 307, when the modulation system information representation 16QAM that control signal comprised of synchronous modulation mode judging unit 303 outputs, infer the frequency shift (FS) deduction signal of signal and 305 outputs of frequency shift (FS) deduction unit with the decline distortion of decline distortion deduction unit 304 outputs, carry out demodulation, output 16QAM receiving digital signals after removing the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and receiving decline distortion in the digital orthogonal baseband signal quadrature component, frequency shift (FS).
64QAM detection unit 307, when the modulation system information representation 64QAM that control signal comprised of synchronous modulation mode judging unit 303 outputs, infer the frequency shift (FS) deduction signal of signal and 305 outputs of frequency shift (FS) deduction unit with the decline distortion of decline distortion deduction unit 304 outputs, carry out demodulation, output 64QAM receiving digital signals after removing the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and receiving decline distortion in the digital orthogonal baseband signal quadrature component, frequency shift (FS).
The following describes the dispensing device with above-mentioned formation and the action of receiving system.At first, transmission digital signal shown in Figure 3 and control signal input to QPSK signal generation unit 201,16QAM signal generation unit 202 and 64QAM signal generation unit 203, have only the signal generation unit action consistent with control signal modulation system information, signal generation unit with corresponding modulation system, generate digital orthogonal baseband signal, the digital orthogonal baseband signal in-phase component is exported to in-phase component switch unit 204, and the digital orthogonal baseband signal quadrature component is exported to quadrature component switch unit 205.
The digital orthogonal baseband signal in-phase component of modulation system signal generation unit output switches to the corresponding input unit of modulation system that control signal is represented by in-phase component switch unit 204, exports to radio-cell 206.And the digital orthogonal baseband signal quadrature component of modulation system signal generation unit output switches to the corresponding input unit of modulation system that control signal is represented by quadrature component switch unit 205, exports to radio-cell 206.
The transmission digital orthogonal baseband signal quadrature component of the transmission digital orthogonal baseband signal in-phase component of in-phase component switch unit 204 outputs and 205 outputs of quadrature component switch unit, by the wireless processing that radio-cell 206 is stipulated, will send signal and export to transmitted power amplifying unit 207.The transmission signal of radio-cell 206 outputs through amplifying unit 207 power amplifications, sends to receiving system by transmitting antenna 208.
The signal that dispensing device sends is received by receiving system by antenna 301 shown in Figure 4.Among Fig. 4, signal (received signal) by antenna 301 receptions, by the wireless processing that reception radio-cell 302 is stipulated, will receive the digital orthogonal baseband signal in-phase component and receive the digital orthogonal baseband signal quadrature component and export to synchronous modulation mode judging unit 303, decline distortion deduction unit 304, frequency shift (FS) deduction unit 305, QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 302 outputs and receive the digital orthogonal baseband signal quadrature component, detect unique word shown in Figure 2 by synchronous modulation mode judging unit 303, according to detected unique word, obtain time synchronized with dispensing device.And, also detect header, the identification modulation system information that header comprised.Generation comprises the control signal of these two information, exports to the decline distortion respectively and infers unit 304, frequency shift (FS) deduction unit 305, QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 302 outputs and receive the digital orthogonal baseband signal quadrature component and the control signal of synchronous modulation mode judging unit 303 outputs, infer the distortion that unit 304 causes according to pilot frequency code element deduction decline shown in Figure 2 by the decline distortion, the distortion that will decline deduction signal is exported to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
And receive the reception digital orthogonal baseband signal in-phase component of radio-cell 302 outputs and receive the digital orthogonal baseband signal quadrature component and the control signal of synchronous modulation mode judging unit 303 outputs, infer that by frequency shift (FS) unit 305 infers frequency shift (FS) according to pilot frequency code element shown in Figure 2, frequency shift (FS) is inferred that signal exports to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308 respectively.
Corresponding each detection unit of its modulation system information of control signal of synchronous modulation mode judging unit 303 outputs, be in QPSK detection unit 306,16QAM detection unit 307 and the 64QAM detection unit 308, infer the frequency shift (FS) deduction signal of signal and 305 outputs of frequency shift (FS) deduction unit with the decline distortion of decline distortion deduction unit 304 outputs, carry out demodulation after removing the reception digital orthogonal baseband signal in-phase component that receives radio-cell 302 outputs and the decline distortion in the quadrature component, frequency shift (FS), export the corresponding receiving digital signals of each modulation system.
Signaling point configuration to pilot frequency code element in the action of transmitted power amplifying unit in this example wireless communication system and each modulation system is illustrated.In addition, in this example, the signaling point amplitude of pilot frequency code element is represented transmitted power on the IQ plane, in case improve transmitted power, the signaling point amplitude of pilot frequency code element just increases.
Fig. 5 illustrates the input/output relation of existing transmitted power amplifying unit.Among Fig. 5, label 401 is illustrated in transmitted power amplifying unit working point and is the average power output that sends.Label 402, label 403 and label 404 are respectively the working ranges (but input to power amplification unit its incoming level scope of signal) of QPSK, 16QAM and 64QAM, the working range of transmitted power amplifying unit when modulation system is separately selected in expression.Working range maximum when as shown in Figure 5, modulation system is 64QAM.Determined working range according to modulation system like this, in the past.
But because the transmitted power amplifying unit transmit power amplifier that can carry out linear amplification to 64QAM modulation system signal, when therefore modulation system is QPSK, 16QAM, working range belongs to the scope that is no more than the 64QAM working range, even if thereby broaden the scope of work, also can carry out linear amplification.
Therefore, this example carries out the communication of Adaptive Modulation, takes the receiving sensitivity of transmitted power amplifying unit receiving system in the scope of its working range of modulation system that is no more than wide operating range the highest like this in this mode of IQ planar configuration pilot frequency code element signaling point.Specifically, when modulation system is QPSK, 16QAM, make the pilot frequency code element incoming level increase in working range is no more than the scope of 64QAM working range, receiving system receiving sensitivity characteristic improves.The following describes this method.
Figure 6 shows that this example QPSK code element and the configuration of pilot frequency code element signaling point in the IQ plane, label 501 is the qpsk modulation signal point, and label 502 is the pilot frequency code element signaling point.And, make that pilot frequency code element signaling point amplitude is r Pilot tone, if increase r Pilot toneThe anti-interference of pilot frequency code element just strengthens in the receiving system, decline distortion among Fig. 4 in the decline distortion of the receiving system deduction unit 304 infers that the deduction precision of precision and frequency shift (FS) deduction unit 305 improves, can carry out the high accuracy detection handles, thereby the raising of the receiving sensitivity characteristic of receiving system, for 64QAM too.
Figure 7 shows that this example 16QAM code element and the configuration of pilot frequency code element signaling point in the IQ plane, label 601 is the 16QAM signaling point, and label 602 is the pilot frequency code element signaling point.And, make that pilot frequency code element signaling point amplitude is r Pilot tone, if increase r Pilot toneThe anti-interference of pilot frequency code element just strengthens in the receiving system, decline distortion among Fig. 4 in the decline distortion of the receiving system deduction unit 304 infers that the deduction precision of precision and frequency shift (FS) deduction unit 305 improves, can carry out the high accuracy detection handles, thereby the raising of the receiving sensitivity characteristic of receiving system, for 64QAM too.
The following describes the working range of two kinds of different transmitted power amplifying units of input-output characteristic.Fig. 8 represents the input/output relation of two kinds of transmitted power amplifying units of this example.Here, in order to attempt carrying out the generality explanation, with two kinds of transmitted power amplifying units as transmitted power amplifying unit A and transmitted power amplifying unit B.Among Fig. 8, the input/output relation of label 701 expression transmitted power amplifying unit A, the input/output relation of 702 expressions of label transmitted power amplifying unit B.When incoming level is in label 703 working ranges, no matter transmitted power amplifying unit A or transmitted power amplifying unit B can both adapt to.But when incoming level was in label 704 working ranges, there was immalleable scope in transmitted power amplifying unit A.For example can consider modulation system just enough communicators to 16QAM, if can adapt to, compare just with the transmitted power amplifying unit that use has label 702 this input-output characteristics and can reduce power consumption by the transmitted power amplifying unit that use has label 701 this input-output characteristics.If but must use the transmitted power amplifying unit shown in the label 702 in order to adapt with the employed 64QAM of this example, just can guarantee than the wideer working range of working range shown in the label 703.Specifically, when adopting QPSK or 16QAM modulation system, strengthen the pilot frequency code element transmitted power if press the working range shown in the label 704, the decline distortion in the receiving system infers that precision, frequency shift (FS) deduction precision just improve, and the receiving sensitivity characteristic of receiving system just improves.
In this example, the working range of transmitted power amplifying unit is a maximum with the working range of 64QAM.Thereby, make r Pilot toneGreater than r QPSKThe result, make transmitted power amplifying unit working range strengthen, but if in 64QAM mode working range, even if select QPSK also can amplify.Also can consider equally during 16QAM.
If consider above-mentioned situation, just can be the input/output relation of transmitted power amplifying unit shown in Figure 9.Figure 9 shows that the input/output relation of this example transmitted power amplifying unit.Among Fig. 9, label 801 is the working point of transmitted power amplifying unit, label 802 is the QPSK working range when making pilot frequency code element signaling point amplitude greater than the peak signal point of QPSK modulation in the past amplitude, label 803 is the 16QAM working range when making pilot frequency code element signaling point amplitude greater than 16QAM peak signal point amplitude, and label 804 is a 64QAM mode working range.But the working range of the working range of label 802 and label 803 is less than the working range of 64QAM.At this moment, and compare with the transmitted power amplifying unit as shown in Figure 5, QPSK working range among Fig. 9,16QAM working range are big, but scalable, also the working range of each modulation system can be set at same range as.In addition, in the receiving system, the anti-interference of pilot frequency code element strengthens when QPSK, 16QAM.Reserve but the amplitude of pilot frequency code element increases to differ, have best amplitude with Figure 10 explanation below.
The pilot frequency code element and the power ratio between signaling point that Figure 10 shows that QPSK modulation in this example are 10 with respect to bit error rate -4, 10 -6The curve chart of required hope carrier power and the ratio of noise power.Label 901 expression bit error rates are 10 -4The required hope carrier power and the ratio of noise power, label 902 expression bit error rates are 10 -6The required hope carrier power and the ratio of noise power.If be conceived to label 901, bit error rate is 10 -4The transverse axis (r of hope carrier power and the ratio minimum of noise power 2 Pilot tone/ r 2 QPSK) just be 2, even if the pilot signal amplitude increases, wish that the carrier power and the ratio of noise power also not necessarily reduce.Bit error rate shown in the label 902 is 10 -6Situation also can consider equally, we can say the best amplitude that has pilot signal.
In addition, this example illustrates in the single carrier mode, but much less also can implement equally by multiple mode, CDMA (code division multiple access) mode or OFDM (Orthogonal Frequency Division Multiplexing OFDM) mode.
With Figure 11 also applicable situation in the common amplification is described below.Figure 11 shows that the formation of the dispensing device that this example amplifies jointly.1001 pairs of frequency f of f1 modulating unit, 1 usefulness digital signal is carried out digital modulation, and the transmission signal of frequency f 1 is exported to adder unit 1004.1002 pairs of frequency f of f2 modulating unit, 2 usefulness digital signals are carried out digital modulation, and the transmission signal of frequency f 2 is exported to adder unit 1004.1003 couples of frequency f n of fn modulating unit carry out digital modulation with digital signal, and the transmission signal of frequency f n is exported to adder unit 1004.
Adder unit 1004 is exported to transmitted power amplifying unit 1005 with the transmission signal of frequency f 1, the transmission signal of frequency f 2 and the transmission signal plus of frequency f n with the transmission signal of addition.The transmission signal of 1005 pairs of additions of transmitted power amplifying unit amplifies, and sends through amplified transmission signal by transmitting antenna 1006.
As mentioned above, according to this example, can be by in the communication that carries out Adaptive Modulation, make the average transmission power output of dispensing device remain a certain steady state value, the receiving sensitivity the best that makes receiving system simultaneously improves the receiving sensitivity characteristic of receiving system like this at IQ planar configuration pilot frequency code element signaling point.
In addition, modulation system is to illustrate with QPSK, 16QAM and this example that is combined as of three kinds of 64QAM, but is not limited to this modulation system, is not limited only to the switching of three kinds of modulation systems in addition.
In this example, be the example explanation with regard to pilot frequency code element with the known signal point, but be not limited thereto, for example also can be with psk modulation signal as pilot frequency code element.
And the decline distortion deduction, the frequency shift (FS) that in this example pilot frequency code element are used for receiving system are inferred, but other control informations such as the header among also available Fig. 2, unique word.
And, for the control information of the channel control information that divisor is outer according to this, also can equally with pilot frequency code element in this example implement as an example.At this moment, it is characterized in that, especially compare that control information has the anti-ability of makeing mistakes for interference with data.
(example 2)
In the example 2,, illustrate with the modulation system of radio propagation environment and this communication mode of communication information amount switching modulation system and determine method for the wireless communication system, dispensing device and the receiving system that adopt illustrated mode in the example 1.
Figure 12 shows that the frame that this example one routine communication terminal is sent constitutes.In addition, add same numeral with Fig. 2 common ground among Figure 12, and omit its detailed description.Among Figure 12, label 1101 is a header, comprises control information.Label 1102 is the radio propagation environment inferential information, is the communication terminal radio propagation environment of inferring the base station signal transmitted, the code element used as radio propagation environment information informing base station.
The receiving system that the following describes the base station constitutes.The receiving system that Figure 13 illustrates this example base station constitutes.Among Figure 13, receive the wireless processing that 1202 pairs of signals (received signal) that receive by antenna 1201 of radio-cell are stipulated, will receive the digital orthogonal baseband signal in-phase component and receive the digital orthogonal baseband signal quadrature component and export to lock unit 1203 and detection unit 1204.
Lock unit 1203, according to reception digital orthogonal baseband signal in-phase component that receives radio-cell 1202 outputs and reception digital orthogonal baseband signal quadrature component, detect the unique word 304 among Figure 12, obtain time synchronized with communication terminal according to detected unique word, export to detection unit 1204 as synchronizing signal.
Detection unit 1204, synchronizing signal according to the reception digital orthogonal baseband signal in-phase component that receives radio-cell 1202 outputs and reception digital orthogonal baseband signal quadrature component and lock unit 1203 outputs, the signal that communication terminal sent is carried out detection handle, receiving digital signals is exported to Data Detection unit 1205.
Data Detection unit 1205 according to the receiving digital signals of detection unit 1204 outputs, is exported to transmission data generating unit 1206 according to the frame formation of Figure 11 with radio propagation environment information, and output receives data in addition.
Send data generating unit 1206, in the middle of the radio propagation environment information of Data Detection unit 1205 outputs and the transmission data of being imported, determine modulation system according to radio propagation environment information, output has and the transmission digital signal of the corresponding information bit of determined modulation system and the control signal of the determined modulation system of informing base station.In addition, in the Data Detection unit 1205, when judgement has a plurality of arrival ripple, do not represented the influence of the parameter of other radio propagation environment, send data generating unit 1206 and select the anti-strong QPSK of ability that makes mistakes, to the communication terminal request.This is because therefore receiving system can not prevent this situation to this signal demodulation when receiving a plurality of arrival ripple.
Figure 14 illustrates the frame formation that this example one routine base station sends.In addition, to adding same numeral with the common part of Figure 12 among Figure 14, and omit its detailed description.Among Figure 14, label 1301 is a modulation system information, the code element that notifying communication terminal base station modulation system is used.
The dispensing device that the following describes communication terminal constitutes.The dispensing device that Figure 15 illustrates this example communication terminal constitutes.Among Figure 15, send data generating unit 1401 and infer signal, generate the transmission digital signal that Figure 12 frame constitutes, export to digital orthogonal baseband signal generation unit 1402 according to sending data and radio propagation environment.
Digital orthogonal baseband signal generation unit 1402 according to the transmission digital signal that sends data generating unit 1401 outputs, generates transmission digital orthogonal baseband signal in-phase component and sends the digital orthogonal baseband signal quadrature component, exports to and sends radio-cell 1403.
Send radio-cell 1403, wireless processing to the transmission digital orthogonal baseband signal in-phase component and the transmission digital orthogonal baseband signal quadrature component of 1402 generations of transmission digital orthogonal baseband signal generation unit are stipulated will send signal and export to transmitted power amplifying unit 1404.Transmitted power amplifying unit 1404 amplifies the transmission signal that sends radio-cell 1403 outputs, and amplified transmission signal is exported to the base station by transmitting antenna 1405.
The receiving system that Figure 16 illustrates this example communication terminal constitutes.Among Figure 16, receive radio-cell 1502, the wireless receiving that the signal (received signal) that receives by reception antenna 1501 is stipulated is handled, output receives the digital orthogonal baseband signal in-phase component and receives the digital orthogonal baseband signal quadrature component.
Synchronous modulation mode judging unit 1506, according to reception digital orthogonal baseband signal in-phase component that receives radio-cell 1502 outputs and reception digital orthogonal baseband signal quadrature component, detect the unique word 104 that frame that Figure 14 base station sent constitutes, obtain time synchronized with the base station, also detect modulation system information 1301, infer modulation system, synchronizing signal and modulation system information are exported to each modulation system detection unit.
QPSK detection unit 1503 according to receiving the digital orthogonal baseband signal in-phase component and receiving digital orthogonal baseband signal, synchronizing signal and modulation system information, when modulation system information representation QPSK, carries out demodulation, and output is through the receiving digital signals of QPSK detection.
16QAM detection unit 1504 according to receiving the digital orthogonal baseband signal in-phase component and receiving digital orthogonal baseband signal, synchronizing signal and modulation system information, when modulation system information representation 16QAM, carries out demodulation, and output is through the receiving digital signals of 16QAM detection.
64QAM detection unit 1505 according to receiving the digital orthogonal baseband signal in-phase component and receiving digital orthogonal baseband signal, synchronizing signal and modulation system information, when modulation system information representation 64QAM, carries out demodulation, and output is through the receiving digital signals of 64QAM detection.
Disturbing wave intensity is inferred unit 1507, according to modulation signal, unique word or pilot frequency code element in the middle of reception digital orthogonal baseband signal in-phase component that receives radio-cell 1502 outputs and the reception digital orthogonal baseband signal quadrature component, infer disturbing wave intensity, disturbing wave intensity deduction signal is exported to radio propagation environment infer unit 1511.
Electric field strength is inferred unit 1508, according to modulation signal, unique word or pilot frequency code element in the middle of reception digital orthogonal baseband signal in-phase component that receives radio-cell 1502 outputs and the reception digital orthogonal baseband signal quadrature component, infer the ratio of received electric field strength or carrier power and noise power, electric field strength is inferred that signal exports to radio propagation environment and infer unit 1511.
Multipath is inferred unit 1509, according to modulation signal, unique word or pilot frequency code element in the middle of reception digital orthogonal baseband signal in-phase component that receives radio-cell 1502 outputs and the reception digital orthogonal baseband signal quadrature component, infer the multipath situation, multipath is inferred that signal exports to radio propagation environment and infer unit 1511.
Doppler frequency is inferred unit 1510, according to modulation signal, unique word or pilot frequency code element in the middle of reception digital orthogonal baseband signal in-phase component that receives radio-cell 1502 outputs and the reception digital orthogonal baseband signal quadrature component, infer Doppler frequency, Doppler frequency is inferred that signal exports to radio propagation environment and infer unit 1511.
Radio propagation environment is inferred unit 1511, infer signal, electric field strength deduction signal, multipath deduction signal and Doppler frequency deduction signal according to disturbing wave intensity, determine the modulation system of output to base station requests, so as a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select QPSK under the situation that disturbing wave intensity is strong.In addition, multipath infers that unit 1509 judges when a plurality of arrival ripple is arranged, do not represented the influence of the parameter of other radio propagation environment, radio propagation environment is inferred the modulation system (being QPSK in this example) of unit 1511 selection strong interference immunities, to the communication terminal request.Perhaps, radio propagation environment infers that disturbing wave deduction signal also can be exported in unit 1511, electric field strength is inferred signal, multipath deduction signal, Doppler frequency deduction signal itself.This is because when receiving a plurality of arrival ripple, receiving system can not this signal of demodulation, therefore prevents this situation.
The following describes the base station with above-mentioned formation and the action of communication terminal.At first, in the dispensing device of communication terminal shown in Figure 15, send data and radio propagation environment and infer signal, be generated as the transmission digital signal that Figure 12 frame constitutes, export to digital orthogonal baseband signal generation unit 1402 by sending data generating unit 1401.
Send the transmission digital signal of data generating unit 1401 outputs,, be generated as and send digital orthogonal baseband signal in-phase component and transmission digital orthogonal baseband signal quadrature component, export to and send radio-cell 1403 by digital orthogonal baseband signal generation unit 1402.
Send the transmission digital orthogonal baseband signal in-phase component of digital orthogonal baseband signal generation unit 1402 outputs and send the digital orthogonal baseband signal quadrature component, by sending the wireless processing that radio-cell 1403 is stipulated, will send signal and export to transmitted power amplifying unit 1404.
Stipulate the transmission signal of wireless processing by sending radio-cell, carry out power amplification, and send by transmitting antenna 1405 by transmitted power amplifying unit 1404.
The signal that communication terminal sends is received by base station shown in Figure 12.Among Figure 13, by the wireless processing that the signal (received signal) of reception antenna 1201 receptions is stipulated by radio-cell 1202, will receive the digital orthogonal baseband signal in-phase component and receive the digital orthogonal baseband signal quadrature component and export to lock unit 1203 and detection unit 1204.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 1202 outputs and receive the digital orthogonal baseband signal quadrature component, detect unique word by lock unit 1203,, obtain time synchronized with communication terminal according to detected unique word, generate synchronizing signal, export to detection unit 1204.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 1202 outputs and receive the digital orthogonal baseband signal quadrature component, by the synchronizing signal of detection unit 1204 according to lock unit 1203 outputs, carry out detection and handle, receiving digital signals is exported to Data Detection unit 1205.
The receiving digital signals of detection unit 1204 outputs generates radio propagation environment information by Data Detection unit 1205, exports to and sends data generating unit 1206.And output receives data.
The radio propagation environment information of Data Detection unit 1205 outputs, determine modulation system by sending data generating unit 1206 according to radio propagation environment, so as a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select QPSK under the situation that disturbing wave intensity is strong, send data by this modulation system modulation, output sends digital signal.And also output is by determined modulation system modulated control signal.
Then, the signal that the dispensing device of base station (with reference to Fig. 2) is sent is by the receiving system reception of communication terminal shown in Figure 16.Among Figure 16, signal (received signal) by reception antenna 1501 receptions, the reception processing of stipulating in reception radio-cell 1502 will receive the digital orthogonal baseband signal in-phase component and export to disturbing wave intensity deduction unit 1507, electric field strength deduction unit 1508, multipath deduction unit 1509, Doppler frequency deduction unit 1510, QPSK detection unit 1503,16QAM detection unit 1504,64QAM detection unit 1505 and synchronous modulation mode judging unit 1506 with reception digital orthogonal baseband signal quadrature component.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 1502 outputs and receive the digital orthogonal baseband signal quadrature component, detect unique word, obtain time synchronized with the base station according to detected unique word by synchronous modulation mode judging unit 1506.Also detect modulation system information, infer modulation system, synchronizing signal and modulation system information are exported to each modulation system detection unit.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 1502 outputs and receive the digital orthogonal baseband signal quadrature component, synchronizing signal and the modulation system information in each modulation system detection unit, exported according to synchronous modulation mode judging unit 1506, this receiving digital signals of output after the demodulation.
Receive the reception digital orthogonal baseband signal in-phase component of radio-cell 1502 outputs and receive the digital orthogonal baseband signal quadrature component, infer that at each unit infers inferring parameter that communication environments is used, will infer that signal exports to radio propagation environment deduction unit 1511.
Each infers the deduction signal of unit output, infers in the unit 1511 at radio propagation environment radio propagation environment is comprehensively judged, the radio propagation environment information of infer, output being reported to the base station.
The following describes the modulation system of the transmission signal initial selected of base station transmission.For example, when constructing the such wireless communication system of this example, the modulation system that the base station transmit signals initial stage is taked just is a problem.At this moment, because the base station does not once send signal to communication terminal yet, so communication terminal can't be inferred radio propagation environment.Thereby the modulation system that the initial stage takes must be determined at this TV station in the base station.If with for example 16QAM or 64QAM is the initial stage modulation system, just can not get quality data at communication terminal when radio propagation environment is abominable.Under the circumstances, to select QPSK to be modulated to.
As mentioned above, the modulation system of initial selected is by taking the modulation system of tool anti-interference in the changeable modulation system, so that communication terminal can improve the quality of data.The initial setting of this modulation system is not limited to this example, can be applied to it is characterized in that switching according to radio propagation environment or communication information amount etc. the communication mode of modulation system.
Equally, it is characterized in that also can considering equally for its initial error correcting system of the transmission signal that is sent in the middle of the communication mode with radio propagation environment change error correcting system.The error correcting system of initial selected is by taking in the middle of the changeable error correcting system error correcting system of tool error correcting capability, so that improve the quality of data.The initial setting of this error correcting system is not limited to this example, can be applied to it is characterized in that switching according to radio propagation environment or communication information amount etc. the communication mode of error correcting system.
Under the variable situation of modulation system, suppose that the base station sends the header except data symbols 102 1101 among Figure 14, unique word 104 and pilot frequency code element 103 at ordinary times.Communication terminal is with these signals that the base station sent, infer radio propagation environment, when beginning and base station communication, radio propagation environment information is sent to the base station, the initial modulation mode according to the radio propagation environment information specified data code element 102 of communication terminal transmission can be passed through in the base station, obtains quality data.At this moment, also can in radio propagation environment information, comprise modulation system information.Utilize this method that modulation system is carried out initial setting, be not limited to this example, can be applied to it is characterized in that switching the communication mode of modulation system according to radio propagation environment or communication information amount etc.In addition, describe with header, unique word and pilot frequency code element as the signal that sends at ordinary times, but be not limited thereto, also can insert the special symbols that radio propagation environment is inferred usefulness.
Equally, for example it is characterized in that in the middle of the communication mode with radio propagation environment change error correcting system, error correcting system for the initial stage of transmission also can be considered equally, communication terminal can be inferred radio propagation environment by the signal that sends at ordinary times according to the base station, when beginning and base station communication, radio propagation environment information is sent to the base station, the radio propagation environment information that the base station sends according to communication terminal is determined the error correcting system of numeric code, obtains quality data.At this moment, also can in radio propagation environment information, comprise error correcting system information.Utilize this method that modulation system is carried out initial setting, be not limited to this example, can be applied to it is characterized in that switching the communication mode of modulation system according to radio propagation environment or communication information amount etc.
Can improve the receiving sensitivity characteristic of receiving system thus by constituting wireless communication system, dispensing device and the receiving system that adopts illustrated mode in the example 1 as mentioned above.At this moment, modulation system is to illustrate with QPSK, 16QAM and this combination of three kinds of 64QAM, but is not limited thereto, and does not limit the switching of three kinds of modulation systems in addition.In addition, among Fig. 3, Figure 13, also can import for example this information of communication information amount, this be taken in to determine modulation system.In addition, be the example explanation as the parameter of radio propagation environment with disturbing wave intensity, electric field strength, multipath situation and Doppler frequency, but be not limited thereto.
(example 3)
In the example 3, initial setting and establishing method when each channel modulation mode makes the modulation system adaptive change according to radio propagation environment, communication information amount etc. in the CDMA mode are described.At this moment, suppose the communication mode of primary modulation (data-modulated) for can between QPSK modulation, 16QAM and 64QAM, switching of base station according to radio propagation environment, communication information amount etc.
The frame that Figure 17 illustrates this example one routine CDMA mode base station signal transmitted constitutes, and the control channel frame is made of modulation system information 1601, channel A transmission power control information 1602, channel Z modulation system information 1603 and the channel Z transmission power control information 1604 etc. of channel A.Channel A frame constitutes and is made of channel A data symbols 1605, and the primary modulation of supposing channel A data symbols 1605 is wherein a kind of modulation system of QPSK, 16QAM and 64QAM.Channel Z frame constitutes and is made of channel Z data symbols 1606, and the primary modulation of supposing channel Z data symbols 1606 is wherein a kind of modulation system of QPSK, 16QAM and 64QAM.
The dispensing device that Figure 18 illustrates this example CDMA mode base station constitutes.The band spectrum modulation unit 1701 of channel A is according to the modulation system information of channel A in the middle of channel A transmission digital signal of being imported and the channel A modulation system information, channel A is sent digital signal carry out wherein a kind of primary modulation of QPSK modulation, 16QAM and 64QAM, channel A is sent digital orthogonal baseband signal export to adder unit 1703.
The band spectrum modulation unit 1702 of channel Z, modulation system information according to channel Z in the middle of channel Z transmission digital signal of being imported and the channel Z modulation system information, channel Z is sent digital signal carry out wherein a kind of primary modulation of QPSK modulation, 16QAM and 64QAM, channel Z is sent digital orthogonal baseband signal export to adder unit 1703.
Adder unit 1703 is the transmission digital orthogonal baseband signal addition of band spectrum modulation unit 1702 outputs of the transmission digital orthogonal baseband signal of band spectrum modulation unit 1701 outputs of the transmission digital orthogonal baseband signal of the transmission digital orthogonal baseband signal of the pilot channel imported, control channel, channel A and channel Z, the transmission digital orthogonal baseband signal of addition exported to sent radio-cell 1704.
The wireless processing that transmission digital orthogonal baseband signal after the addition of 1704 pairs of adder units of transmission radio-cell, 1703 outputs is stipulated, output sends signal.
Transmitted power amplifying unit 1705 amplifies the transmission signal that sends radio-cell 1704 outputs, by antenna 1706 output process amplified transmission signal.
The receiving system that Figure 19 illustrates CDMA mode base station in this example constitutes.Receive radio-cell 1802, the wireless processing to the signal (received signal) that receives by antenna 1801 is stipulated will receive digital orthogonal baseband signal and export to channel A detection unit 1803 and channel Z detection unit 1804.
Channel A detection unit 1803 carries out detection to the reception digital orthogonal baseband signal that receives radio-cell 1802 outputs and handles, and the receiving digital signals of channel A is exported to channel A Data Detection unit 1805.And channel Z detection unit 1804 carries out detection to the reception digital orthogonal baseband signal that receives radio-cell 1802 outputs to handle, and the receiving digital signals of channel Z is exported to channel Z Data Detection unit 1806.
Channel A Data Detection unit 1805 according to the channel A receiving digital signals of channel A detection unit 1803 outputs, generates the radio propagation environment information that channel A communication terminal is inferred, exports to channel A modulation system determining unit 1807.And, the reception data of going back delivery channel A.
Channel Z Data Detection unit 1806 according to the channel Z receiving digital signals of channel Z detection unit 1804 outputs, generates the radio propagation environment information that channel Z communication terminal is inferred, exports to channel Z modulation system determining unit 1808.And, the reception data of going back delivery channel Z.
Channel A modulation system determining unit 1807, channel A radio propagation environment information according to communication information amount information of being imported and 1805 outputs of channel A Data Detection unit, select the modulation system of the giving consideration to channel A communication terminal quality of data and message transmission rate in the middle of QPSK, 16QAM and the 64QAM, export to control channel as channel A modulation system information and send signal generation unit 1809.
Channel Z modulation system determining unit 1808, passage Z radio propagation environment information according to communication information amount information of being imported and 1806 outputs of channel Z Data Detection unit, select the modulation system of the giving consideration to channel Z communication terminal quality of data and data transmission bauds in the middle of QPSK, 16QAM and the 64QAM, export to control channel as channel Z modulation system information and send signal generation unit 1809.
Control channel sends signal generation unit 1809, with the channel A modulation system information of channel A modulation system determining unit 1807 output and the channel Z modulation system information of channel Z modulation system determining unit 1808 outputs, generate, output comprises channel A modulation system information and channel Z modulation system information interior based on Figure 17 in the control channel signals that constitutes of control channel frame.
The frame that Figure 20 illustrates this example one routine CDMA mode communication terminal signal transmitted constitutes, and label 1901 is inferred the radio propagation environment of base station signal transmitted and the radio propagation environment information that informing base station is used for communication terminal.Label 1902 is a data symbols.
The dispensing device that Figure 21 illustrates CDMA mode communication terminal in this example constitutes, and sends data generating unit 2001 and infers signal according to transmission data of being imported and radio propagation environment, generates and sends digital signal, exports to band spectrum modulation unit 2002.
Band spectrum modulation unit 2002 carries out spread spectrum to the transmission digital signal that sends data generating unit 2001 outputs, will export to according to the transmission digital orthogonal baseband signal that Figure 24 frame constitutes and send radio-cell 2003.
Send radio-cell 2003, the wireless processing to the transmission digital orthogonal baseband signal of band spectrum modulation unit 2002 outputs is stipulated will send signal and export to transmitted power amplifying unit 2004.
Transmitted power amplifying unit 2004 amplifies the transmission signal that sends radio-cell 2003 outputs, sends through amplified transmission signal by antenna 2005.
The receiving system that Figure 22 illustrates CDMA mode communication terminal in this example constitutes.Among Figure 22, signal (received signal) by reception antenna 2101 receptions, the wireless processing of stipulating in receiving radio-cell 2102 will receive the digital orthogonal baseband signal in-phase component and receive the digital orthogonal baseband signal quadrature component and export to detection unit 2103, disturbing wave intensity and infer that unit 2104, electric field strength infers that unit 2105, multipath push away unit 2106 and Doppler frequency deduction unit 2107.
Detection unit 2103 carries out detection processing back output to the reception digital orthogonal baseband signal in-phase component and the reception digital orthogonal baseband signal quadrature component that receive radio-cell 2102 outputs.
Disturbing wave intensity infers that unit 2104 is according to receiving the reception digital orthogonal baseband signal in-phase component that radio-cell 2102 exported and receiving pilot channel components and control channel component in the middle of the digital orthogonal baseband signal quadrature component, infer disturbing wave intensity, disturbing wave intensity deduction signal is exported to radio propagation environment infer unit 2108.
Electric field strength is inferred unit 2105, according to receiving the reception digital orthogonal baseband signal in-phase component that radio-cell 2102 exported and receiving pilot channel components and control channel component in the middle of the digital orthogonal baseband signal quadrature component, infer received electric field strength, electric field strength is inferred that signal exports to radio propagation environment and infer unit 2108.
Multipath is inferred unit 2106, according to receiving the reception digital orthogonal baseband signal in-phase component that radio-cell 2102 exported and receiving pilot channel components and control channel component in the middle of the digital orthogonal baseband signal quadrature component, infer the multipath situation, multipath is inferred that signal exports to radio propagation environment and infer unit 2108.
Doppler frequency is inferred unit 2106, according to receiving the reception digital orthogonal baseband signal in-phase component that radio-cell 2102 exported and receiving pilot channel components and control channel component in the middle of the digital orthogonal baseband signal quadrature component, infer Doppler frequency, Doppler frequency is inferred that signal exports to radio propagation environment and infer unit 2108.
In sum, the modulation system of the transmission signal that sends to communication terminal can be transmitted by the modulation system information that the base station sent is inserted control channel in the base station.In addition, especially making communication terminal is the mode of inferring radio propagation environment with the pilot channel and the control channel of base station transmission, even if the base station does not send communication terminal under the situation of data symbols, communication terminal also can be inferred radio propagation environment.
By adopting means as mentioned above, can in the CDMA mode, constitute each channel modulation mode and adapt to the wireless communication system that radio propagation environment, communication information amount etc. are switched modulation system.Equally, also can constitute each channel error correcting system can be corresponding to the wireless communication system of variations such as radio propagation environment, communication information amount.
The following describes the method for initializing rotational of the modulation system that each channel modulation mode in the CDMA mode can change with radio propagation environment, communication information amount etc.When for example constructing the such wireless communication system of this example, the modulation system that the transmission signal initial stage that the base station sent adopts just is a problem.In this case, for example making 16QAM or 64QAM is the initial modulation mode, and when radio propagation environment was abominable, communication terminal just can not get quality data.If under the circumstances, be modulated to select QPSK.
In sum, the modulation system of initial selected is by taking in changeable modulation system the modulation system of tool anti-interference, so that communication terminal improves the quality of data.
Equally, in the middle of each channel error correcting system for example can the communication mode with radio propagation environment, communication information quantitative changeization, error correcting system for the initial stage of transmission also can be considered equally, the error correcting system of initial selected improves the quality of data by taking the error correcting system of tool error correcting capability in the changeable error correcting system.
The following describes the method for initializing rotational when each channel modulation mode adaptation radio propagation environment, communication information amount etc. are switched modulation system in the CDMA mode.In this method, communication terminal is not when carrying out data communication with the base station, and all the signal that sends at ordinary times according to the base station (for example signal of pilot channel, control channel) is inferred radio propagation environment.And, when communication terminal begins to carry out data communication with the base station, communication terminal at first will be given the base station according to the radio propagation environment message transmission that the signal of pilot channel, control channel is inferred, after this radio propagation environment information is received in the base station, the modulation system of determining base station transmit signals a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select QPSK when disturbing wave intensity is strong.By means as mentioned above, communication terminal just makes the primary data quality that the base station sent improve.
Equally, for example the modulation system of each channel also can be implemented with the communication mode of radio propagation environment, communication information quantitative changeization by its error correcting system.The pilot channel that communication terminal sends at ordinary times according to the base station, control channel are inferred radio propagation environment, when beginning to communicate by letter with the base station, radio propagation environment information is sent to the base station, the base station is according to radio propagation environment information that communication terminal sent, the error correcting system of specified data character code unit, for example a little less than electric field strength, Doppler frequency is big, a plurality of arrival ripples are arranged, select the strong mode of error correcting capability when disturbing wave intensity is strong, thereby can obtain quality data.Here in the explanation of CDMA mode, be the example explanation as the signal that sends at ordinary times with pilot channel and control channel, but be not limited thereto, so long as the signal of Fa Songing gets final product at ordinary times.In addition, be by the variable explanation of modulation system of base station signal transmitted, but be not limited thereto, also can be undertaken by the modulation system of communication terminal signal transmitted is variable.
By means as mentioned above, can constitute the wireless communication system, dispensing device and the receiving system that adopt illustrated mode in the example 1, the receiving sensitivity characteristic of receiving system is improved.At this moment, modulation system is that QPSK, 16QAM and this combination of three kinds of 64QAM are illustrated, but is not limited thereto, and is not limited to the switching of three kinds of modulation systems.And, among Fig. 3, Figure 13, also can import for example communication information amount information, this is taken in determine modulation system.And, as the parameter of radio propagation environment, be the example explanation with disturbing wave intensity, electric field strength, multipath situation and Doppler frequency, but be not limited thereto.
(example 4)
In the example 4, the wireless communication system, dispensing device and the receiving system that adopt illustrated mode in the example 1 are described.
The dispensing device of this example base station constitutes, and omits its detailed description with reference to Fig. 2.The receiving system that Figure 23 illustrates this example base station constitutes.Receive radio-cell 2202, to the wireless processing that the signal that receives by antenna 2201 is stipulated, output receives the digital orthogonal baseband signal in-phase component and receives the digital orthogonal baseband signal quadrature component.
Lock unit 2203 according to the reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs with receive the digital orthogonal baseband signal quadrature component, is obtained the time synchronized with communication terminal, exports to detection unit 2204 as synchronizing signal.
Detection unit 2204 according to the synchronizing signal of the reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs and reception digital orthogonal baseband signal quadrature component and lock unit 2203 outputs, carries out detection and handles, the output receiving digital signals.
Disturbing wave intensity is inferred unit 2205, according to reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs and reception digital orthogonal baseband signal quadrature component, infer disturbing wave intensity, disturbing wave intensity deduction signal is exported to modulation system determining unit 2209.
Electric field strength is inferred unit 2206, according to the reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs with receive the digital orthogonal baseband signal quadrature component, infers electric field strength, and electric field strength is inferred that signal exports to modulation system determining unit 2209.
Multipath is inferred unit 2207, according to the reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs with receive quadrature tape base signal in orthogonal component, infers the multipath situation, and multipath is inferred that signal exports to modulation system determining unit 2209.
Doppler frequency is inferred unit 2208, according to reception digital orthogonal baseband signal in-phase component that receives radio-cell 2202 outputs and reception digital orthogonal baseband signal quadrature component, infer Doppler frequency, and Doppler frequency is inferred that signal exports to modulation system determining unit 2209.
Modulation system determining unit 2209, infer signal, electric field strength deduction signal, multipath deduction signal and Doppler frequency deduction signal according to the disturbing wave intensity that obtains by the communication terminal signal transmitted, determine the modulation system of base station transmit signals, so as a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select QPSK when disturbing wave intensity is strong, the output control signal.
The following describes the modulation system that the base station sends the initial stage.When constructing the such wireless communication system of this example for example, at first communication terminal will send the signal transmission, the signal that base station received communication terminal is sent, infer radio propagation environment, determine modulation system, a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select QPSK when disturbing wave intensity is strong.Like this, by determining the modulation system at transmission initial stage, communication terminal just makes the quality of data improve.The initial setting of this modulation system is not limited to this example, goes for it is characterized in that switching according to radio propagation environment, communication information amount etc. the communication mode of modulation system.
Equally, for example it is characterized in that and to make in the communication mode of error correcting system variation with radio propagation environment, also can consider equally for sending initial error correcting system, the error correcting system that initial stage is selected, at first communication terminal will send the signal transmission, the signal that base station received communication terminal sends is inferred radio propagation environment, determine error correcting system, so as a little less than electric field strength for example, Doppler frequency is big, a plurality of arrival ripples are arranged, select the strong mode of error correcting capability when disturbing wave intensity is strong, and the base station signal transmitted is determined that its error correcting system gets final product.
In sum, by determining the error correcting system at transmission initial stage, so that improve the quality of data in the communication terminal.The initial setting of this error correcting system is not limited to this example, also goes for it is characterized in that switching according to radio propagation environment, communication information amount etc. the communication mode of error correcting system.
By means as mentioned above, can constitute the wireless communication system, dispensing device and the receiving system that adopt illustrated mode in the example 1, the receiving sensitivity characteristic of receiving system is improved.In addition, also can be in Fig. 3, Figure 23 the information of inputting communication information amount, this is taken in to determine modulation system.In addition, as the radio propagation environment parameter, be the example explanation with disturbing wave intensity, electric field strength, multipath situation and Doppler frequency, but be not limited thereto.
In this example, also can multipleization mode, and implement equally by CDMA mode, OFDM mode.
(example 5)
In the example 5, the dispensing device and the receiving system of communication of the present invention is described.
Figure 24 illustrates this example one routine frame and constitutes, and with respect to the transverse axis time, label 2301 is a header, is that receiving system is obtained the code element of using with the dispensing device time synchronized.Label 2302 is a data symbols, and modulation system is variable.Label 2303 is a pilot frequency code element, is the code element of inferring that transmission road distortion, frequency shift (FS) are used.Label 2304 is used code element for control, is the code element of system information, unit information etc. being carried out system's control usefulness.
Figure 25 illustrates the signaling point configuration of QPSK code element and pilot frequency code element in this example IQ plane, the signaling point of data symbols 2302 among label 2401 expression Figure 24, label 2402 expression headers 2301, the control signaling point of code element 2304, the signaling point of label 2403 expression pilot frequency code elements 2303.The signaling point amplitude that makes label 2402, label 2403 is the signaling point amplitude of the distance of initial point apart greater than label 2401.Thus, the receiving system facility improves the deduction precision of transmission road distortion, the deduction precision of frequency shift (FS) with pilot frequency code element.And, the control strong interference immunity of code element.Here, carry out the signaling point configuration so that can use by the usage of transmitted power amplifying unit illustrated in the example 1.
Figure 26 illustrates the signaling point configuration of 16QAM code element and pilot frequency code element in the IQ plane, the signaling point of data symbols 2302 among label 2501 expression Figure 24, label 2502 expression headers 2301, the control signaling point of code element 2304, the signaling point of label 2503 expression pilot frequency code elements 2303.The signaling point amplitude that makes label 2502, label 2503 is the peak signal point amplitude of the distance of initial point apart greater than label 2501.Thus, receiving system utilizes pilot frequency code element that the deduction precision of transmission road distortion, the deduction precision of frequency shift (FS) are improved.Control strong interference immunity in addition with code element.Here, carry out the signaling point configuration so that can use by the usage of transmitted power amplifying unit illustrated in the example 1.
Figure 27 illustrates the signaling point configuration of 64QAM code element in this example IQ plane, the signaling point of data symbols 2302 among label 2601 expression Figure 23, header 2301, pilot frequency code element 2303 and control are got a certain signaling point with peak swing shown in the label 2602 among Figure 27 with code element 2304.
The dispensing device that Figure 28 illustrates this example constitutes.Among Figure 28, add that with Fig. 3 common ground the label identical with Fig. 3 omits its detailed description.Radio-cell 2701, the selected modulation system information that control signal comprised according to input, the transmission digital orthogonal baseband signal in-phase component of in-phase component switch unit 204 outputs and the transmission digital orthogonal baseband signal quadrature component of quadrature component switch unit 205 outputs are carried out gain controlling, will send signal and export to transmitted power amplifying unit 207.
The inside that Figure 29 illustrates the signal generation unit constitutes, and QPSK signal generation unit 201,16QAM signal generation unit 202 and the 64QAM concrete formation of signal generation unit 203 among Fig. 3 or Figure 28 is shown.
Among Figure 29, frame timing control unit 2801 will be exported to modulation signal generation unit 2802, control signal generation unit 2803, header signal generation unit 2804, pilot signal generation unit 2805 and signal selected cell 2806 respectively to the frame clock signal that the frame sequential is controlled.
Modulation signal generation unit 2802, frame according to frame clock signal in the middle of the frame clock signal of transmission digital signal of being imported and 2801 outputs of frame timing control unit constitutes, generate modulation signal, the transmission digital orthogonal baseband signal of data symbols is exported to signal selected cell 2806.
Control signal generation unit 2803, constitute according to the frame of the control of being imported with frame clock signal in the middle of the frame clock signal of digital signal and 2801 outputs of frame sequencing control portion, generate control signal, the transmission digital orthogonal baseband signal of control signal is exported to signal selected cell 2806.
Header signal generation unit 2804 constitutes according to the frame of the frame clock signal of frame timing control unit 2801 output, generates header, and the transmission digital orthogonal baseband signal of header is exported to signal selected cell 2806.
Pilot signal generation unit 2805 constitutes according to the frame of the frame clock signal of frame timing control unit 2801 output, generates pilot signal, and the transmission digital orthogonal baseband signal of pilot signal is exported to signal selected cell 2806.
Signal selected cell 2806, frame according to frame clock signal in the middle of the frame clock signal of the transmission digital orthogonal baseband signal of the pilot signal of the transmission digital orthogonal baseband signal of the header of the transmission digital orthogonal baseband signal of the control signal of the transmission digital orthogonal baseband signal of the data symbols of modulation signal generation unit 2802 output, 2803 outputs of control signal generation unit, 2804 outputs of header signal generation unit, 2805 outputs of pilot signal generation unit and 2801 outputs of frame timing control unit constitutes, the transmission digital orthogonal baseband signal that selection is exported, the transmission digital orthogonal baseband signal that output is selected.
The following describes decline distortion shown in Figure 4 and infer unit 304, according to the signaling point amplitude of pilot frequency code element and the ratio of the peak signal point amplitude of each modulation system, output and the modulation system distortion deduction signal that declines accordingly.With Figure 30 its concrete formation is described.The receiving system that Figure 30 illustrates this example constitutes.Among Figure 30, for adding that with Fig. 4 common ground the label identical with Fig. 4 omits its detailed description.
Correcting unit 2901 is according to the modulation system information of control signal in the middle of decline distortion deduction unit 304 decline distortion deduction signal of exporting and the control signals of being imported, calculated correction value, the decline distortion is inferred signal times with corrected value, the decline distortion deduction signal after proofreading and correct is exported to QPSK detection unit 306,16QAM detection unit 307 and 64QAM detection unit 308.At this moment, corrected value is the value definite with the ratio of the peak signal point amplitude of each modulation system according to the signaling point amplitude of pilot frequency code element.Improve the decline distortion thus and infer the deduction precision of signal, improve the receiving sensitivity characteristic of receiving system.
In sum, according to this example, available mutual power amplifier amplifies the modulation signal of multiple modulation system, can carry out high sensitivity in receiving system one side and receive.
(example 6)
The frame that Figure 31 illustrates this example 6 one routine base station signal transmitteds constitutes.Among Figure 31, with respect to time and frequency axis, label 3001 is a data symbols, as modulation system, can select that for example QPSK, 16QAM and 64QAM are wherein a certain.Label 3002 is a pilot frequency code element, as described in enforcement form 1, makes the pilot frequency code element signaling point variable amplitude on IQ plane according to the modulation system of data symbols 3001.
The dispensing device that Figure 32 illustrates this example base station constitutes.Among Figure 32, modulating unit 3101 modulation systems according to the control signal of being imported, frame configuration information are modulated by selected modulation system the transmission digital signal of being imported, and serial signal is exported to serial parallel transformation unit 3102.
Serial parallel transformation unit 3102, the serial signal that modulating unit 3101 is exported carries out parallel transformation, and parallel signal is exported to discrete inverse Fourier transform unit 3103.Radio-cell 3104 to the inverse Fourier transform of disperse of the parallel signal of serial parallel transformation unit 3102 outputs, will be exported to through the signal after the inverse Fourier transform of dispersing in discrete inverse Fourier transform unit 3103.
The wireless processing that the signal of 3104 pairs of discrete inverse Fourier transforms of radio-cell unit, 3103 outputs is stipulated will send signal and export to transmitted power amplifying unit 3105.The transmission signal of 3105 pairs of radio-cells of transmitted power amplifying unit, 3104 outputs amplifies, and will send to communication terminal by antenna 3106 through amplified transmission signal.
The receiving system that Figure 33 illustrates this example communication terminal constitutes.Among Figure 33, Fourier transform unit 3203 is exported in the wireless processing that 3202 pairs of signals (received signal) that receive by antenna 3201 of radio-cell are stipulated.The signal of 3203 pairs of radio-cells of Fourier transform unit, 3202 outputs carries out Fourier transform, and parallel signal is exported to parallel serial conversion unit 3204.
Parallel serial conversion unit 3204, the parallel signal that Fourier transform unit 3203 is exported carries out parallel serial conversion, the output serial signal.Disturbing wave intensity is inferred unit 3205, according to the serial signal (for example according to pilot frequency code element) of parallel serial conversion unit 3204 outputs, infers disturbing wave intensity, disturbing wave intensity deduction signal is exported to radio propagation environment infer unit 3209.
Electric field strength is inferred unit 3206, according to the serial signal (for example according to pilot frequency code element) of parallel serial conversion unit 3204 outputs, infers electric field strength, and electric field strength is inferred that signal exports to radio propagation environment and infer unit 3209.Multipath is inferred the serial signal (for example according to pilot frequency code element) of unit 3207 according to 3204 outputs of parallel serial conversion unit, infers to arrive the ripple number, and multipath is inferred that signal exports to radio propagation environment and infer unit 3209.
Doppler frequency is inferred unit 3208, according to 3204 outputs of parallel serial conversion unit serial signal (for example according to pilot frequency code element), infer Doppler frequency, Doppler frequency is inferred that signal exports to radio propagation environment and infer unit 3209.
Radio propagation environment infers that unit 3209 is according to disturbing wave intensity deduction signal, electric field strength deduction signal, multipath deduction signal and Doppler frequency deduction signal, determine the request that the base station sends, infer signal output as radio propagation environment to the signal modulation system.And, disturbing wave intensity is inferred that signal, electric field strength deduction signal, multipath deduction signal and Doppler frequency deduction signal itself are as the output of radio propagation environment deduction signal.In addition, radio propagation environment is inferred this information of signal, is sent to the base station from the dispensing device of communication terminal, thereby changes the modulation system of base station signal transmitted.But when disturbing wave intensity is inferred that signal, electric field strength infer that signal, multipath infer that signal and Doppler frequency infer that signal itself infers that as radio propagation environment signal is exported, to modulation system really rule undertaken by the base station.
The serial signal (for example according to pilot frequency code element) of unit 3210 according to 3204 outputs of serial parallel transformation unit inferred in distortion, infers the distortion that causes because of the transmission road, and distortion is inferred that signal exports to correcting unit 3211.Correcting unit 3211, distortion is inferred that the value that the distortion of unit 3210 output infers that signal and modulation system by Figure 30 data symbols 3001 change the amplitude of pilot frequency code element 3002 in the IQ plane multiplies each other as corrected value, will infer that signal export to demodulating unit 3212 through the distortion of overcorrect.Signal is inferred in the distortion of demodulating unit 3212 after according to the correction of correcting unit 3211 output, and the serial signal of serial parallel transformation unit 3204 outputs is carried out demodulation, the output receiving digital signals.
The inside that Figure 34 illustrates modulating unit 3101 among Figure 32 constitutes.Among Figure 34, QPSK serial signal generation unit 3301, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is QPSK, constitute the generation serial signal according to the frame among Figure 31, the QPSK serial signal is exported to serial signal selected cell 3304.
16QAM serial signal generation unit 3302, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is 16QAM, constitute the generation serial signal according to the frame among Figure 31, the 16QAM serial signal is exported to serial signal selected cell 3304.
64QAM serial signal generation unit 3303, when the modulation system information that control signal comprised in the middle of transmission digital signal of being imported and control signal is 64QAM, constitute the generation serial signal according to the frame among Figure 31, the 64QAM serial signal is exported to serial signal selected cell 3304.
Serial signal selected cell 3302 with QPSK serial signal, 16QAM serial signal, 64QAM serial signal and control signal as input, according to the modulation system information that control signal comprised, select the serial signal of specified modulation mode, as selected serial signal output.At this moment Xuan Ding serial signal is equivalent to the serial signal that modulating unit 3101 is exported among Figure 32.
Wherein, QPSK serial signal generation unit 3301,16QAM serial signal generation unit 3302 and 64QAM serial signal generation unit 3303, identical with example 1, make that transmission average power signal separately is constant, and in homophase-orthogonal plane the signaling point amplitude of configuration pilot frequency code element, even if make that switching modulation system in the transmitted power amplifying unit 3106 does not change working range yet.In addition, can also in the IQ plane, dispose the signaling point amplitude of pilot frequency code element, make that the receiving sensitivity of transmitted power amplifying unit 3106 communication object in the scope that does not produce distortion is best.
The dispensing device that Figure 35 illustrates this example base station constitutes.Among Figure 35, be that with Figure 32 difference control signal inputs to radio-cell 3401.Radio-cell 3401 has the function of adjusting according to the modulation system information that comprises in the control signal of being imported, and makes the average transmitting power that sends signal all equate for any modulation system.
By means as mentioned above, the mode of example 1, example 2 and example 5 explanations also can be implemented in the OFDM mode.
(example 7)
Explanation is with regard to the different viewpoint of example 1 illustrated mode in the example 7, be conceived to improve the receiving sensitivity characteristic of receiving system, the communication that carries out Adaptive Modulation makes the maximum of each modulation system send the situation that power output equates to carry out transfer of data.
The dispensing device of this example has Fig. 3 and constitutes, but the amplification method of transmitted power is different with example 1.In addition, therefore receiving system omits each and constitutes explanation owing to have Figure 13 formation.Shown in Figure 36 is the input/output relation of this example transmitted power amplifying unit.Among Figure 36, the working point of label 3601 expression 64QAM, the working point of label 3602 expression 16QAM, label 3603 is represented the working point of QPSK, and the average transmission power output difference of each modulation system is described.In addition, the working range of label 3604 expression QPSK, the working range of label 3605 expression 16QAM, the working range of label 3606 expression 64QAM, each modulation system has identical working range.
By the transmit power amplifier that above-mentioned power amplification is carried out in employing, the receiving sensitivity characteristic of receiving system is improved.And the dispensing device with formation shown in Figure 10 and uses transmit power amplifier to compare respectively according to each modulation system, can realize the miniaturization of dispensing device.
The following describes the different this methods of service of interior its service range of each modulation system of its service area of base station of implementing to it is characterized in that having the illustrated power amplifier of this example.
But Figure 37 is the concept map that the base station communication range is shown with regard to each modulation system.Among Figure 37, in the middle of the signal that base station 3701 sends, can communicate by letter in the frame shown in the label 3702 by the signal of 64QAM modulation, the service area 3702 of this zone as 64QAM.Equally, in the middle of the signal that base station 3701 sends, can communicate by letter in the frame shown in the label 3703 by the signal of 16QAM modulation, the service area 3703 of this zone as 16QAM.In addition, in the middle of the signal that base station 3701 sends, can communicate by letter in the frame shown in the label 3704 by the signal of QPSK modulation, the service area 3704 of this zone as QPSK.
Can be that the average transmission power output of 64QAM is low than other modulation system because as shown in Figure 36 like this with regard to different modulating mode segmentation service district why, if communication among a small circle, makeing mistakes of transmission road be also few, therefore suitable high-speed communication.And the average transmission power output of QPSK is than other modulation system height, even if communication on a large scale, makeing mistakes of transmission path is also less, therefore is suitable for low speed data communication, audio communication.
By means as mentioned above, to carry out in the communication of Adaptive Modulation, the maximum that can implement to it is characterized in that each modulation system sends power output and equates, can carry out transfer of data, and the different this methods of service of its service range of each modulation system.
(example 8)
Explanation is to make in the example 7 that the maximum power output that sends equates the situation of the average transmission power output that the regulation wireless communication system is allowed when carrying out transfer of data in each modulation system of explanation in the example 8.
When making the maximum of each modulation system send power output to equate, for example make that the average transmission power output of QPSK is 2W, the average transmission power output of 16QAM is 1W, and the average transmission power output of 64QAM is 0.5W.
Relative therewith, when the average transmission power output of stipulating in the wireless communication system is 0.25W to 3.00W scope, equate that the average transmission power output of each modulation system is also in the average transmission output power range of defined even if make the maximum of each modulation system send power output.
But when the average transmission power output of stipulating in the wireless communication system is 0.25W to 1.50W scope, equate that the average transmission power output of QPSK just is 2W if make the maximum of each modulation system send power output, just not in prescribed limit.
In this case, the average transmission power output of QPSK is limited in the prescribed limit, and is 1.5W as condition enactment with scalable each the modulation system signal of transmitted power amplifying unit.
Like this, when stipulating on average to send power output in the wireless communication system, need to consider this point, the power output of the maximum of each modulation system transmission at this moment is not necessarily equal.
In sum, according to the present invention, carry out in the communication of Adaptive Modulation, the average transmitting power of dispensing device is remained a certain firm power level, by adopting mode at IQ planar configuration pilot frequency code element signaling point, make receiving sensitivity characteristic the best of receiving system, can improve the receiving sensitivity characteristic of receiving system.
The invention is not restricted to above-mentioned example, can under the situation that does not deviate from protection range of the present invention, can carry out many variations and modification.
The Japanese patent application 2001-245052 that Japanese patent application 2001-51829 that the Japanese patent application 2000-337114 that the Japanese patent application 2000-320624 that this specification proposed based on October 20th, 2000, on November 6th, 2000 propose, February 27 calendar year 2001 propose and August 10 calendar year 2001 propose.This specification comprises these contents.

Claims (3)

1. radio communication device, it is characterized in that, having a plurality of signals that generate digital orthogonal baseband signal with mutually different modulation systems generates parts, generates in the middle of the signal of parts output the switching part of select target signal only from described a plurality of signals, the selected digital orthogonal baseband signal of described switching part is stipulated the radio parts of wireless processing and the power amplification parts that the transmission signal of described radio parts output is carried out power amplification
Described signal generates parts equates the peak swing value of the digital orthogonal baseband signal in described each modulation system.
2. radio communication device as claimed in claim 1 is characterized in that, when stipulating that each modulation system on average sends power output, set average send power output make it in prescribed limit with each modulation system in maximum to send power output the most approaching.
3. radio communication device as claimed in claim 1 is characterized in that, sends in the radio communication device of a plurality of carrier waves, carries out transmitted power with the common power amplifier of described a plurality of carrier waves and amplifies.
CN 200710087756 2000-10-20 2001-10-22 Radio communication apparatus Pending CN101035107A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2000320624 2000-10-20
JP320624/00 2000-10-20
JP337114/00 2000-11-06
JP051829/01 2001-02-27
JP245052/01 2001-08-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101188595B (en) * 2007-12-25 2010-10-13 北京创毅视讯科技有限公司 A transmitter and time sequence control method for this transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101188595B (en) * 2007-12-25 2010-10-13 北京创毅视讯科技有限公司 A transmitter and time sequence control method for this transmitter

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