CN1810003A - Modulation method, modulation apparatus, demodulation apparatus, and radio communication system - Google Patents
Modulation method, modulation apparatus, demodulation apparatus, and radio communication system Download PDFInfo
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Abstract
The present invention provides a first and second quadrature modulators (109,110) quadrature modulate Nyquist signals, which have been given delay differences of two and four times the symbol period, respectively, using, as a carrier, a cosine wave having a frequency that is an odd multiple of the basic frequency of Nyquist signal. A third quadrature modulator (113) quadrature modulates the modulated signals obtained by the first and second quadrature modulators (109,110), using a carrier having a predetermined frequency. In this way, a modulated signal can be obtained in which four Nyquist signals are arranged within a single symbol period (T) with no mutual interference.
Description
Technical field
The present invention relates to a kind of modulator approach that improves frequency utilization efficient, modulating device, demodulating equipment and wireless communication system.
Technical background
Recent years,, cause that people are to the requirement of information communication and the attention of expansion because the IT (Information Technology, information technology) that popularizes and be referred to as of the information processing technology changes fast development of society.Between society and society, needn't speak more certainly, even the communications facility between individual and the society also thirsts for realizing high speed and wireless penetration.Face so demand that enlarges day by day of mobile communication, also can cause the exhaustion of abundant frequency resource.
Now, in order to solve this problem, developing the spatial multi communication in place of a kind of MIMO of being referred to as (Multi Input Multi Output, multiple-input and multiple-output).But, in the Communication Development of utilizing fast changing transmission environment, be not only the base station, and in the terminal installation of holding in one's own possession, also will carry out a large amount of signal processing, this can cause the increase of consumed power, and device becomes and more increases the weight of thick growing up and the increase of cost.Therefore, as basic solution, be to press for the modulation efficiency that improves in the baseband.
The modulation system of mobile communication now is that the quadrature phase that will be referred to as digital communication is modulated as keynote, is the modulation system that can obtain the highest frequency utilization efficient now.That wherein be at the highest notch is quadrature phase Modulation and Amplitude Modulation (QAM).When adopting this modulation system under mobile environment, to communicate, if be in the multipath decline (Multi Pass Fading) that is accompanied by change at a high speed, then be 16QAM to the maximum, the summit is 4bit (bit)/sec (second)/2Hz (hertz), and promptly the summit is 2bit/sec/Hz.
By adopting a plurality of antennas to use a plurality of biographies to remove the path, so that guarantee independence to greatest extent, obtain further frequency utilization efficient, this developmental research is in progress.For example: if use vertically polarized wave and horizontal polarized wave, then can transmit various information on same frequency, if use 16QAM respectively, then can reach maximum frequency utilization efficient in theory is 4bit/sec/Hz.But, in reflected wave and mobile environment, be the orthogonality (independence) that makes vertically polarized wave and horizontal polarized wave recipient signal processing completely effectively, must the present device more than 2 times of burden.
Equally, use N root antenna, the research of pursuing N transmission speed doubly is also in process.But the independence that the biography that will guarantee N root antenna is fully removed the road is very difficult, and this needs many speeches.
Therefore, be not to utilize fast changing biography to remove environment, and prerequisite is the modulation efficiency that improves in the baseband.
Even to this day, the technical foundation that has improved frequency utilization efficient is the Nyquist theory, (promptly and the interference of adjacent signals code element (symbol) low) independent signal ripple that promptly so-called and adjacent signals ripple orthogonality are high utilize technology and be referred to as partly reply or the adjacent signals ripple of small echo between the reduction technology of intersymbol symbol interference.As an example of this technology, be record to some extent in the Japan Patent of 1988-92143 at publication number.
The most representative example of Nyquist theory is represented with sin (x)/x, and the function of representing sort signal is referred to as the sinc function.The sinc function is a solitary wave, constitutes zero simultaneously and hand on the signaling point of adjacent signals ripple, thereby do not disturb mutually.
In communication in the past, with the x of sin (x) as the time shaft variable be phase modulated (PSK) and quadrature amplitude modulation (QAM), as the frequency axis variable is OFDM communications (OFDM).The quadrature of time shaft and frequency axis physical property, thereby their side can be carried out primary modulation, and the opposing party is carried out secondary modulation, for example with them as 16QAM-OFDM.This modulator approach can keep very high frequency utilization efficient and guarantee mobile communication ability etc., obtains the communication efficiency of height.
Here, describe in the past digital modulation technique in detail.One of main purpose of digital modulation is to realize high frequency utilization efficient.This technology is referred to as the frequency band limits technology promptly can realize high as far as possible message transmission in the bandwidth that is given technology.In analogue transmission, self modulate with its amount of information, thus not only tediously long, and compress with the leeway of high efficiency modulation very little.
The frequency band limits technology of digital modulation is the most representative with the method for utilizing nyquist filter.The method of using nyquist filter is by giving nyquist characteristic to code element, so that reduce the interference between signal (code element) on the time shaft, and inserts the technology of high density code element.
In order to prevent mutual interference among signals, must realize that zero hands in each symbol section cycle.This is referred to as Nyquist the 1st benchmark.The filter that has satisfied this requirement is referred to as nyquist filter.The representative example of realizing this kind nyquist filter is the sinc function.Sinc function h (t) with code-element period during as T represents it with following arithmetic.
h(t)＝sin(πt/T)/(πt/T)……(1)
When setting up this nyquist filter with digital filter, be by 4 times over-sampling input base-band input signal (code element).
During by the nyquist filter restricted band, all to decide its degree each time herein, with (RollOff) rate of roll-offing.The span of roll-off rate is from 0 to 1.For example, roll-off rate is 0.5 o'clock, and required bandwidth then is 1.5 times of transmission speed.Therefore, in order to improve frequency utilization efficient, preferably with roll-off rate as O.
Fig. 1 is the schematic diagram of digital quadrature modulation (QPSK) in the past.The I axis signal is to carry on surplus revolving (cosine) carrier wave, thereby is that the apex configuration of Nyquist ripple is on phase zero with signaling point.The Q axis signal is to carry on dextrorotation (sine) carrier wave, thereby is that the apex configuration of Qwest's ripple is on the phase place pi/2 with signaling point.About the I axis signal, when information signal is " 1 ",, then be configured on the position of the waveform that shows as the I axis signal (+1) among Fig. 1 if adopt convex polarity.When information signal is " 0 " or " 1 ", below form convex configuration, thereby be configured in as I axis signal (1) among Fig. 1 and on the waveform position that shows.
Equally, about the Q axis signal, when information signal is " 1 ",, then be configured on the waveform position among Fig. 1 as Q axis signal (+1) demonstration up as adopting convex polarity.When information signal is " O " or " 1 ", below constitute convex configuration, thereby be configured on the waveform position that shows as Q axis signal (1) among Fig. 1.
In method in the past, the Nyquist waveform is completed into 1 waveform in the scope of code-element period T, and this is because the reason of having carried out the Nyquist signalling of NRZ (non-return-to-zero, not return-to-zero) signal.In the edge of Nyquist ripple promptly as shown in Figure 1, the position of phase place π becomes NULL (blank) during I axis signal (+1), and however, not strain is blank (Null), i.e. zero potential as current potential.Therefore, can not can not will be configured on the π position as OFDM in abutting connection with code element.
This state as shown in Figure 2.Only be conceived to the I axis signal of quadrature modulation among Fig. 2.From the Nyquist theory, each phase intervals π goes up should configurable code element.But, the blank spot of Nyquist ripple and non-zero, but become " 1 ".Therefore, just taken place to disturb completely with the follow-up Nyquist ripple in abutting connection with code element, the composite value vanishing promptly can not be carried out the code element configuration to the π phase place to Nai Kuisi is being seen in theory.
Foregoing is exactly the present situation of digital modulation mode in the past, also is to hinder the reason that improves frequency utilization efficient.
As mentioned above, the modulation system that in the past proposed is commonly to be structured on the I-Q plane substantially.This plane is two-dimentional.Therefore, basically only otherwise carry out many-valuedization, the transmissible information in 1 code-element period is 2 bits.Now, under the environment of high-speed mobile, 16QAM is actually the best modulation system of frequency utilization efficient.But, under the condition of limited frequency resource,, must realize the better modulation system of frequency utilization efficient in order to transmit more information.
Summary of the invention
The object of the present invention is to provide a kind of ratio modulation system in the past more can improve modulator approach, modulating device, demodulating equipment and the wireless communication system of frequency utilization efficient.
Reach this purpose by following method.For the Nyquist signal of the 1st input symbols with this Nyquist signal is given the Nyquist signal of the 2nd input symbols of delaying difference of integral multiple in 1/4 cycle of the code-element period of above-mentioned input symbols, the cosine wave of frequency that will have the odd-multiple of above-mentioned Nyquist signal fundamental frequency uses as carrier wave, carries out quadrature modulation.
Description of drawings
Fig. 1 is the principle key diagram of digital quadrature modulation (QPSK) in the past;
Fig. 2 represents the code element configuration of quadrature modulation in the past and the rational position of the code element rethought according to the Nyquist theory;
Fig. 3 is the figure of the example of the planisphere when having added new code element according to the present invention;
Fig. 4 is the figure of the multiplexing and code-element period of expression Nyquist ripple;
Fig. 5 is the collocation method figure of expression according to QPSK ring of the present invention;
Fig. 6 is the signal configures of modulating wave on expression basis of the present invention and the figure of method;
Fig. 7 is the oscillogram of explanation that is used for being undertaken by carrier wave the modulation of Nyquist ripple;
Fig. 8 is that expression is the odd-multiple of code-element period as the frequency setting with carrier wave, does not then produce the oscillogram of interference on the T/2 point;
Fig. 9 is expression as uses the Nyquist waveform, can transmit the figure of 2 bits on I axle and Q axle in symbol section;
To be expression insert at interval figure on I axle and the Q axle with the Nyquist signal respectively by π to Figure 10;
Figure 11 is the insertion position figure that the I axle of expression in the present invention and Q axle insert various new code elements;
Figure 12 is the block diagram of the modulating device of the relevant embodiments of the present invention 1 of expression;
Figure 13 is the oscillogram of expression by the modulation signal that modulating device obtained of execution mode 1;
Figure 14 is the block diagram of the demodulating equipment of the relevant embodiments of the present invention 1 of expression;
Figure 15 (a) is the figure of the waveform of the input symbols after the expression Nyquist is shaped;
Figure 15 (b) is the oscillogram that expression is used for the carrier wave of primary modulation;
Figure 15 (c) is the oscillogram of the primary modulation waveform of the modulating device of expression by execution mode 1 when using the input symbols of Figure 15 (a) to modulate Figure 15 (b) to be used for the carrier wave of primary modulation;
Figure 16 (a) is the figure of expression by the envelope of the secondary modulation ripple that modulating device obtained of execution mode 1;
Figure 16 (b) is the figure of expression by the frequency spectrum of the secondary modulation ripple that modulating device obtained of execution mode 1;
Figure 17 represents by the modulation signal that modulating device obtained of execution mode 1 and QPSK in the past the figure of the analog result after the communication quality of 16QAM compares;
Figure 18 is the pie graph of the modulating device of expression execution mode 2;
Figure 19 is the pie graph of the demodulating equipment of expression execution mode 2;
Figure 20 is the pie graph of the modulating device of expression execution mode 3;
Figure 21 is the pie graph of the demodulating equipment of expression execution mode 3; And
Figure 22 is the pie graph of the demodulating equipment of expression execution mode 4.
Embodiment
Below, describe embodiments of the present invention in detail with reference to attached drawing.
(execution mode 1)
Invention process of the present invention once and principle of the present invention at first are described.
The present inventor thinks, if can on the plane of I-Q, make up one 4 dimension space, but then in 1 code-element period information transmitted just become 4 bits (during QPSK), frequency efficiency has just improved 2 times.
But, a plurality of QPSK rings can not be placed on the I-Q plane, therefore as shown in Figure 3, to set up the 3rd at least and make it on the I-Q plane, to carry out quadrature.This necessity is self-explantory.But, which type of physical quantity to make new axle with? in the present invention the 3rd (z axle) considered as the phase place dimension.
, 2 QPSK rings are housed in 1 code-element period herein, promptly mean 2 Nyquist ripples of configuration on the I axle, such as shown in Figure 4.The Nyquist ripple is in 2 code-element periods, constitutes its major part, can obtain its orthogonality at each code-element period T (time).Therefore, for the orthogonality of establishing 2 positions, just must shown in Fig. 4 (b) like that code-element period be shortened 1/2 at 1 code-element period.If adopt method in the past to realize, then bandwidth will be enlarged 2 times.In order to improve frequency utilization efficient, just can only find out SSB (Single Side Band: the method for Huaing monolateral band).
The present invention is exactly in view of this consideration, has adopted 2 Nyquist ripples method in 1 code-element period of being housed in (followingly is referred to as two QPSK with the method: two QPSK modes).
The collocation method of the QPSK ring in the two QPSK modes among the present invention once at first is described, two QPSK modes are the modes in order to realize that phase place is multiple, if the Z axle is defined as the phase difference composition of phase modulated, (but Fig. 5 represents pi/2-two deviators (offset dual): biasing QPSK) then to become as shown in Figure 5 configuration.
The basic ideas of of the present invention pair of QPSK mode are understood this figure for the ease of watching as shown in Figure 6, and execution mode has 4 independently envelopes.Just like on the cylinder of representing with analytic signal that constitutes by carrier wave, sticking an independently model of 4 Nyquist wave envelopes.For 4 Nyquist wave envelopes are housed in 1 code-element period, each code element is pressed per 1 differential seat angle that disposes 90 degree respectively.
Return Fig. 4 and illustrate,, then as shown in Fig. 4 (a), can produce intersymbol interference, thereby be not dispose the Nyquist ripple in the past on a T/2 if in 1 code-element period, dispose 2 Nyquist ripples.The present inventor just considers if in the particular carrier wave frequency Nyquist ripple is modulated, and just can avoid intersymbol interference, so that the present invention has just been arranged.
Now use Fig. 7 to represent the basic ideas that of the present invention pair of QPSK mode specialized.Fig. 7 (a) and (b) all are to repeat to represent that Nyquist ripple to code-element period T multiply by the cosine wave of (modulation) cycle 2T, and from then on figure can find out clearly that the waveform after the modulation also is the Nyquist ripple, but the cycle becomes 1/2 of original Nyquist ripple.As representing that with mathematical formulae the Nyquist ripple can be represented with the sinc function.Therefore, the carrier wave (cosine wave) of the Nai Kuitebo of code-element period T and cycle 2T is long-pending then shown in following formula.
As can be known, long-pending (modulation output) also is the sinc function from (2) formula, and the cycle becomes T/2.Therefore, even the signal that adds after modulating can not produce mutual interference phenomenon yet.Fig. 7 (c) is the oscillogram of expression when synthetic.
As mentioned above, 2 Nyquists number be multiply by cosine wave (carrier wave), and these 2 Nyquist ripples are the Nyquist ripples of delaying difference that given 1/4 integral multiple of code-element period mutually, this is first necessary condition of the present invention.In view of the above, multiply by (promptly after the modulation) 2 Nyquist signals behind the cosine wave then becomes mutually and does not disturb.
But the carrier wave of cycle 2T contains DC (direct current) field after modulation, thereby needs to improve carrier frequency.But if merely improve carrier frequency, then the code element of Nyquist ripple point can produce and interfere with each other phenomenon.
The 2nd necessary condition of the present invention is that the frequency setting with above-mentioned cosine wave (carrier wave) is the odd-multiple of the fundamental frequency of Nyquist signal, that is, the cycle of the cosine wave (carrier wave) that will be taken advantage of is as 2T/ (2n+1).Fig. 8 is the oscillogram (n=0,1,2 example) of expression when being the carrier wave of 2T/ (2n+1) in the Nyquist waveform cycle of multiply by.As can be seen from Figure 8, just as the present invention,, then can not disturb code element point by the Nyquist ripple of every T/2 configuration if use with the odd harmonic of 2T as the basic cycle.In addition, Fig. 8 has represented cycle of carrier wave waveform state as 2T, 2T/3,2T/5.
Be that main points of the present invention are that quadrature modulator is set, the cosine of frequency of odd-multiple that will have the fundamental frequency of Nyquist signal uses as carrier wave, and the Nyquist signal of the 1st input symbols and the Nyquist signal of the 2nd input symbols of delaying difference of 1/4 integral multiple that this Nyquist signal had a code-element period of input symbols are carried out quadrature modulation.If be provided with this kind quadrature modulator, even also can be in 1 code-element period when carrying out dual quadrature modulation, and make and do not produce interference between the Nyquist signal, thereby in identical frequency band is wide, accommodate 2 times of code elements in the past 4 Nyquist signal configures.
Further specify principle of the present invention from another angle again.Use the Nyquist waveform if Fig. 9 is expression, can in 1 code-element period, transmit 2 bits at I axle and Q axle.Can have the phase difference of pi/2 at I axle and Q axle in quadrature modulation, this point is well-known.
Figure 10 be illustrated in the past the I axle and the signal correspondences (planisphere) of 2 dimensions of Q axle, increase the figure of formation 4 dimension spaces after new 2 of the present invention.Therefore, 4 axles of the I axle (bearing) among Figure 10, Q axle (bearing), S axle (bearing), T axle (bearing) all are separate, become 4 dimensions by the planisphere that they constituted.In addition, the dotted line among Figure 10 is to represent that can carry out primary modulation disposes code element one by one.As shown in the figure, insert the Nyquist signal at interval with π respectively at I axle and Q axle, at this moment, the orthogonality of no Nyquist signal promptly can not can become Null to the other side's signaling point assurance between in the past phase point and new phase place.
Therefore, such as shown in Figure 7 in the present invention, in order to dispose code element, not that the simple code element in the past adds new code element to new phase point, multiply by cosine wave (carrier wave) but adopt, make it to have orthogonality.And, as described above, by with the frequency of cosine wave (carrier wave) as the odd-multiple of fundamental frequency with Nyquist signal, but the just wide expansion of rejection band.
Figure 11 is the figure of insertion position of each new code element of the I axle of expression in the present invention and Q axle.From then on scheme as can be known, 2 signals that the phase difference that is in π is concerned carry out quadrature modulation in the present invention, in other words, have carried out dual quadrature modulation in the present invention.
Figure 12 is the pie graph of the relevant modulating device of expression embodiments of the present invention 1.Modulating device 100 is transmit legs that wireless communication system is set.Quadrature modulation and dual QPSK that the information of 100 pairs 4 systems of modulating device is carried out 2 level structures handle, and comprising: delay device group 102,103,104 to what 1/4th of data-signal (input symbols) Bit1 of 4 systems, Bit2, Bit3, the additional symbol section T of Bit4 delayed difference; To have symbol section T 1/2 delay the difference signal as the input 2 groups the 1st and the 2nd quadrature modulator 109,110; With the output of quadrature modulator 109,110 the 3rd quadrature modulator 113 as input.
4 signals that modulating device 100 forms after delaying handling by each nyquist filter 105,106,107,108, and be divided into 2 groups of each 2 signal of the difference relation of delaying (being the relation of phase difference π) that is in T/2, import the 1st quadrature modulator 109 and the 2nd quadrature modulator 110.
(n: carrier wave integer) carries out primary modulation to the Nyquist signal to the 1st quadrature modulation 109 devices, and 2 signals of synthetic input by cycle 2T/ (2n+1).Equally, (n: carrier wave integer) carries out primary modulation to the Nyquist signal to the 2nd quadrature modulator 110, and 2 signals of synthetic input by cycle 2T/ (2n+1).
Modulation signal through 2 systems that obtained after the above-mentioned processing is transfused to band pass filter (BPF) 111,112, removes picture intelligence that primary modulation produces and parasitic component and filtered signal is sent to the 3rd quadrature modulator 113 by band pass filter 111,112.
The 3rd quadrature modulator 113 is by high frequency (ω
c) modulation signal of 2 systems that are transfused to is carried out quadrature modulation (secondary modulation).Remove the road from sending the signal after the secondary modulation of the 3rd quadrature modulator 113 output is removed picture signal and parasitic component by band pass filter 114 after to wireless biography.
So, just can obtain 4 input signal information as the Nyquist ripple that in 1 code-element period, respectively has 90 ° of differences and by the modulation signal of being accommodated by modulating device 100.Figure 13 is its concept map.In the I axis signal, exist the Nyquist composite wave of 2 signals of accommodating by the T/2 difference.In the Q axis signal, exist the Nyquist composite wave of comparing into the difference of T/4 with the I axle and starting.In time difference of 1/4 of pressing code-element period T and on the envelope of moment t1, t2 arranged side by side, t3, t4,4 signaling points just expression come out.
Figure 14 is the demodulating equipment 200 of demodulation is carried out in expression to the modulation signal of modulating device 100 formation a pie graph.Demodulating equipment 200 is arranged on the recipient of wireless communication system.Demodulating equipment 200 inputs to the 1st quadrature demodulator 201, the 1 quadrature demodulators 200 by high frequency (ω with modulation signal
c) modulation signal of input is carried out obtaining the 1st and the 2nd restituted signal after quadrature is reconciled.
The restituted signal of this kind 2 systems is input to the 2nd, the 3rd quadrature demodulator 204,205 by band pass filter 202,203.The the 2nd and the 3rd quadrature demodulator 204,205 each personal cycle 2T/ (2n+1), (n: carrier wave integer) carries out the quadrature demodulation of input signal.
Then, from 4 system's restituted signals of the 2nd and the 3rd quadrature demodulator 204,205 output by nyquist filter 206,207,208,209 with delay device group 210,211,212 and become demodulation bit Bit1, Bit2, Bit3, Bit4, this delay the device group be used for additional symbol section T 1/4th delay poor.Demodulation bit Bit1, Bit2, Bit3, Bit4 make it arrayization by parallel/serial translation circuit (P/S) 213, have so just obtained reception data (RXout:RX output).
As mentioned above, if use demodulating equipment 200, after carrying out good demodulation, can make the preceding bit post-equalization of original modulation by the signal after modulating device 100 modulation.
Secondly, also described modulating device shown in Figure 12 100 being arranged on the emulation that this wireless communication system that transmit leg and demodulating equipment 200 shown in Figure 14 be arranged on the recipient carried out the affirmation of modulation action and carried out BER under the AWGN environment.
Important content among the present invention be whether the Nyquist ripple to be configured in code-element period 1/2 on, this is to need the content confirmed in the primary modulation.Figure 15 is the figure as a result for the test of confirming this content.Figure 15 (a) is expression code element input (Nyquist shaping back), and Figure 15 (b) is the carrier wave that the expression primary modulation is used, and Figure 15 (c) is an expression primary modulation output signal.In addition, they all are equivalent to a side of I axle or Q axle.If have a look the Nyquist input of Figure 15 (a) and the primary modulation output of 15 (c), just know that the signaling point of Nyquist ripple has been expressed out really.
Figure 16 is the frequency spectrum that expression demonstrates secondary modulation output wave and bandwidth thereof.In secondary modulation, by quadrature modulation, I axle component and Q axle component are synthesized, and have synthesized 4 kinds of envelopes (Figure 16 (a)).In addition, from frequency spectrum (Figure 16 (b)) as can be known bandwidth be I hertz (Hz).With the code-element period of input as 1 second (sec) (Nyquist period of wave: 0.5Hz) simulate, produced two side waves, become 1Hz/-3dB, the correctness on this representation theory by modulation.
Secondly, the communication quality of modulation system of the present invention is better than 16QAM, and this is the major premise that improves frequency utilization efficient.Figure 17 is illustrated in BER under the AWGN environment to the analog result figure of S/N.From then on analog result as can be seen, the BER of modulation system of the present invention substantially equates with QPSK, compares with having equal transmission degree of sending 16QAM, even have 10
-2The advantage that also can keep the above S/N characteristic of 4dB on the point.
Like this,, as 3 following quadrature modulators are set just can be implemented under the condition that does not enlarge bandwidth, form the modulating device 100 of the modulation signal of accommodating 2 times of signals in the past according to present embodiment.1st, the 2nd quadrature modulator 109,110: the input have separately code-element period 1/2 (2/4) delay the difference the Nyquist signal, Nyquist signal to input, the cosine wave of frequency of odd-multiple that will have the fundamental frequency of Nyquist signal carries out quadrature modulation as carrier wave, and the 3rd quadrature modulator 113: the carrier wave with deciding frequency carries out quadrature modulation to modulation signal that is obtained by the 1st quadrature modulator 109 and the modulation signal that is obtained by the 2nd quadrature modulator 110.
(execution mode 2)
In above-mentioned execution mode 1, transmissible amount of information is 4 bits in 1 code-element period, and this is suitable with 16QAM in the past.On the other hand, in modulation system in the past, have for the mode of reality as many-valuedization such as 64QAM.In this execution mode, further improved efficient by modulation system, and proposed the method for corresponding many-valuedization in the past.
Figure 18 is the pie graph of the modulating device of embodiments of the present invention 2.In Figure 18, used prosign at counterpart with Figure 12, omit the explanation of relevant this part.Modulating device 300 will send data (TXData) input mapping handling part 301, and it mainly is to change processing and error correction coding side by side to sending data (TXData) that the mapping of mapping handling part 301 is handled.The 1st bit and the 2nd bit after mapping handling part 301 will be handled are sent to adder 302, the 3rd bit and the 4th bit are sent to adder 304, the 5th bit and the 6th spy are sent to adder 303, the 7th bit and the 8th bit are sent to adder 305.
Each adder 302～305 is carried out the signal that 2 bits are put in add operation in order by the signal of 2 bits to input.The output of adder 302 is sent to nyquist filter 105, and the output of other adders 303～305 is sent to Nyquist filter 106～108 by delaying device 102～104.Handle by these, the Nyquist signal of exporting from each nyquist filter 105～108 just has the information of 2 bits at 1 ripple, and subsequent treatment is identical with Figure 12.
Figure 19 is the pie graph that the modulation signal demodulating device 400 of modulating device 300 formation is passed through in demodulation.Demodulating equipment 400 is arranged on the wireless communication system recipient.In addition, in Figure 19, used prosign, omitted the explanation of this part with the counterpart of Figure 14.Demodulating equipment 400 is equipped with simulates the analog digital converter (A/D) 401～404 of a digital translation with the Nyquist signal and separates the mapping handling part 405 except being equipped with, identical with the formation of the demodulating equipment 200 of Figure 14.
Each simulates a digital translation loop 401～404 by the threshold determination from the Nyquist signal of nyquist filter 206～209 output being obtained the information of 2 bit bases.Separate mapping handling part 405 and undertaken handling, obtain reception data (RXout) based on the mapping of separating of array processing and error correction decoding by the bit of 8 systems to input.
If like this according to present embodiment, add the formation of execution mode 1, by processing to many-valuedization of Nyquist signal self, just can with the same frequency band width of execution mode 1 in transmit 2 times data of execution mode 1, further improved frequency utilization efficient.
(execution mode 3)
In execution mode shown in Figure 12 1 and execution mode 2 shown in Figure 180, to as and after the transmission data of column signal are configured code element configuration on the phase point of 4 five equilibriums in symbol section, after promptly being configured on the position of phase zero, phase place pi/2, phase place π, phase place 3 pi/2s, carry out the quadrature modulation of the code element of phase zero and phase place π again by primary modulation, carried out the quadrature modulation of the code element of phase place pi/2 and phase place 3 pi/2s simultaneously, promptly carried out having phase difference π (be code-element period 1/2 delay poor) the primary modulation of symbol signal.
As a result, the recipient carries out the quadrature demodulation of phase difference pi/2 in the 1st stage, but the quadrature demodulation under the environment of dynamic change fierceness compares with the demodulation of phase difference π, and the error of phasetophase may strengthen, produce intersymbol interference and the distortion that transmits weak.Therefore, in this execution mode, by the 1st, the 2nd quadrature modulation handle deal with relationship for the code element of phase difference pi/2 (be code-element period 1/4 delay poor).
The Figure 20 that uses prosign to represent to the corresponding position with Figure 18 is the pie graph of the modulating device 500 of embodiments of the present invention 3.As aforementioned, have 1/4 the Nyquist signal of delaying difference of code-element period by the input of the 1st and the 2nd quadrature modulator 501,502, carry out the common quadrature modulation of phase difference pi/2, thus with used carrier frequency as ω
cOn the other hand, carry out the synthetic of phase difference π by the 3rd quadrature modulator 503, thus with used carrier frequency as (2n+1) ω
oAt this moment, in order to alleviate (2n+1) ω really
oCode element half period point on interference, should be with ω
cAs ω
oThe frequency of even-multiple.
The Figure 21 that uses same code element to represent to the corresponding position with Figure 19 is the pie graph of the demodulating equipment 600 of embodiments of the present invention 3.Demodulating equipment 600 is arranged on the recipient, and the modulation signal that is sent after modulating by the modulating device 500 that is arranged on transmit leg is carried out demodulation.
Will be in the 1st quadrature demodulator 601 used carrier frequency of demodulating equipment 600 is as (2n+1) ω
oOn the other hand, carry out the common quadrature demodulation of phase difference pi/2 by the 2nd and the 3rd quadrature demodulator 602,603, therefore, with used carrier frequency as ω
c
As mentioned above,, add the effect of execution mode 1 and form 2, just can realize further reducing the modulation system of the distortion in intersymbol interference and the transmission if adopt present embodiment.
In addition, though in this execution mode, describe, to having the predetermined carrier frequency ω of the Nyquist signal of delaying difference in 1/4 cycle of code-element period
cCarry out primary modulation, the situation when using the cosine wave of frequency of the odd-multiple of fundamental frequency to carry out secondary modulation to the signal by 2 systems that primary modulation obtained again as carrier wave with Nyquist signal.3/4 cycle was not limited only to for 1/4 cycle but delay difference, even also could.In a word, the signal of delaying difference of the odd-multiple in 1/4 cycle with code-element period being carried out primary modulation gets final product.
(execution mode 4)
In this execution mode, the cosine wave of frequency of odd-multiple that will have the fundamental frequency of Nyquist signal makes as carrier wave and is used for carrying out the quadrature modulation quadrature modulator and describes with the situation that other constitutes when realizing.Its basic principle is identical with execution mode 1～3.
To using among Figure 22 that prosign represents, has shift register 701,702 in the modulating device 700 of present embodiment as the 1st and the 2nd modulator that carries out primary modulation with the counterpart of Figure 12.Modulating device 700 side's by 703,704 pairs of Nyquist signals of inverter in the Nyquist signal of 2 systems of each shift register 701,702 of input polarity is reversed.In this execution mode, bit 3 and bit 4 are implemented polarity inversion.
Handle through these, modulating device 700 has just obtained the positive signal bit 1 of I axle and the negative signal bit 3 of I axle, has also obtained the positive signal bit 2 of Q axle and the negative signal bit 4 of Q axle simultaneously.
The positive signal bit 1 of the I axle that has so obtained and the negative signal bit 3 of I axle are input to shift register 701, and simultaneously, the positive signal bit 2 of Q axle and the negative signal bit 4 of Q axle are input to shift register 702.
In other words, shift register 701,702 is imported the Nyquist signal (in this execution mode of delaying difference of the integral multiple in 1/4 cycle with code-element period separately, code-element period 1/2), and the Nyquist signal that uses the mutual output of frequency of the odd-multiple of fundamental frequency to be imported with Nyquist signal.
This kind processing is equivalent to use as carrier wave with the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have the Nyquist signal, and the Nyquist signal of the 1st input symbols and the Nyquist signal of the 2nd input symbols of delaying difference of integral multiple in 1/4 cycle that this Nyquist signal had a code-element period of input symbols are carried out quadrature modulation.
In addition, serial/parallel transducer (S/P) 101, shift register 701,702, quadrature modulator 113 move according to the clock signal of coming the clock generating unit 705 of self-generating independent clock respectively.
Consequently from band pass filter 114 obtain as shown in Figure 6 the I axle and the modulation output of the Q axle code element that has 2 bits respectively.
The present invention is not limited only to above-mentioned execution mode, can carry out variously implementing it after changing.
One of form of modulator approach of the present invention is the modulator approach of the 1st input symbols and the 2nd input symbols being carried out quadrature modulation, the Nyquist signal of the 1st input symbols and the Nyquist signal of the 2nd input symbols of delaying difference of integral multiple in 1/4 cycle that this Nyquist signal given the code-element period of above-mentioned input symbols is used the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal carry out quadrature modulation as carrier wave.
If make in this way, available cosine wave (carrier wave) carries out quadrature modulation to the 1st and the 2nd Nyquist signal of delaying difference of the integral multiple in 1/4 cycle with input symbols period T, thereby can make the 1st and the 2nd Nyquist signal not produce interference mutually, all be housed in the 1 code-element period T of input symbols.If but only use the method, then have DC component.Therefore, if carry out secondary modulation, its bandwidth result just enlarges 2 times.For this reason, above-mentioned cosine wave is chosen to be the odd-multiple of the fundamental frequency with Nyquist signal, the result is configured in the code element point of Nyquist ripple on per 1 T/2 point, does not disturb mutually between signal.Promptly be formed on each T/2 point and can form when a side Nyquist ripple becomes maximum, the opposing party's Nyquist ripple then becomes 2 Nyquist ripples of blank relation.Through handling like this, bandwidth does not enlarge, and can form the modulation signal that can accommodate 2 times of signals in the past.
In addition, another form of modulator approach of the present invention is as follows: each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poor, Nyquist is shaped, thereby acquisition have the step of delaying the 1st～the 4th poor Nyquist signal in 1/4 cycle of code-element period; The cosine wave of frequency of odd-multiple of fundamental frequency that will have above-mentioned Nyquist signal is as carrier wave, respectively the 1st and the 2nd Nyquist signal of delaying difference in 2/4 cycle with code-element period and the 3rd, the 4th Nyquist signal of delaying difference with 2/4 cycle of code-element period carried out the primary modulation step of quadrature modulation; And the carrier wave that uses predetermined frequency, the orthogonal demodulation signal of the orthogonal demodulation signal of the above-mentioned the 1st and the 2nd Nyquist signal that are obtained through the primary modulation step and above-mentioned the 3rd, the 4th Nyquist signal is carried out the secondary modulation step of quadrature modulation.
In addition, another form of modulator approach of the present invention is as follows: each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poor, Nyquist is shaped, thereby obtains to have the step of the 1st～4 Nyquist signal of delay difference in 1/4 cycle of code-element period; The the 1st and the 2nd Nyquist signal of delaying difference in 1/4 cycle with code-element period and the 3rd and the 4th Nyquist signal of delaying difference with 1/4 cycle of code-element period are carried out the primary modulation step of quadrature modulation with the carrier wave of preset frequency; And the cosine wave of frequency of odd-multiple that will have the fundamental frequency of above-mentioned Nyquist uses as carrier wave, respectively to the orthogonal demodulation signal of the above-mentioned the 1st and the 2nd Nyquist signal that from above-mentioned primary modulation step, are obtained and the above-mentioned the 3rd and the orthogonal demodulation signal of the 4th Nyquist signal carry out the secondary modulation step of quadrature modulation.
If compare when taking modulation signal that these methods are obtained by the secondary modulation step and merely 2 Nyquist signals being carried out quadrature modulation, bandwidth can not enlarge, and can the phase mutual interference between the 1st～the 4th Nyquist signal relevant with the 1st～the 4th input symbols and be configured.Therefore, can obtain with identical in the past bandwidth in be configured to modulation signal toward 2 times the code element of not disturbing each other.
The structure that another form of modulating device of the present invention is taked is to possess: import the 1st Nyquist signal relevant with the 1st input symbols and this Nyquist signal is had the 2nd Nyquist signal relevant with the 2nd input symbols of delaying difference of integral multiple in 1/4 cycle in input symbols cycle, use the cosine wave of frequency of the odd-multiple of the fundamental frequency with these Nyquist signals this 1st and the 2nd Nyquist signal to be carried out the quadrature modulator of quadrature modulation.
If adopt this structure, then because of using cosine wave (carrier wave) that the 1st and the 2nd Nyquist signal of delaying difference of the integral multiple in 1/4 cycle with input symbols period T is carried out quadrature modulation, so can the phase mutual interference between the 1st and the 2nd Nyquist signal, can all be housed in the 1 code-element period T of input symbols., above-mentioned cosine wave frequency is selected on the odd-multiple of the fundamental frequency with Nyquist signal, thereby with regard to the may command DC component, even carry out secondary modulation, frequency band can not enlarge yet in fact in addition.Thereby can form the modulation signal of accommodating 2 times code element in the past, and do not enlarge bandwidth.
In addition, the structure that another form of modulating device of the present invention is taked is to possess: delay the device group, each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poor; Nyquist filter forms the Nyquist signal respectively from the code element of above-mentioned 4 systems; The the 1st and the 2nd quadrature modulator, input has the Nyquist signal of delaying difference in 2/4 cycle of code-element period respectively, the Nyquist signal imported is used the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal carry out quadrature modulation as carrier wave; And the modulation signal that will be obtained by the 1st quadrature modulator and use the carrier wave of preset frequency to carry out the 3rd positive intermodulation device of quadrature modulation by the modulation signal that the 2nd quadrature modulator is obtained.
In addition, the structure that another form of modulating device of the present invention is taked is to possess: delay the device group, each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poor; Nyquist filter forms the Nyquist signal respectively from the code element of above-mentioned 4 systems; The the 1st and the 2nd quadrature modulator is imported the Nyquist signal of delaying difference of the odd-multiple in 1/4 cycle that has code-element period respectively, and uses the carrier wave of preset frequency to carry out quadrature modulation; And the modulation signal that will be obtained by the 1st quadrature modulator and use the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal to carry out the 3rd positive intermodulation device of quadrature modulation as carrier wave by the modulation signal that the 2nd quadrature modulator is obtained.
If adopt these to constitute, in 1 code-element period T, obtain 2 Nyquist signals by the 1st quadrature modulator and be configured in modulation signal under the non-interfering state.Just can in 1 code-element period T, obtain 2 Nyquist signals by the 2nd quadrature modulator simultaneously and be configured in modulation signal under the non-interfering state.Just can in 1 code-element period T, obtain 4 Nyquist signals by the 3rd quadrature modulator and be configured in mutually modulation signal under the disturbance state not, consequently form bandwidth and do not enlarge, can accommodate the modulation signal of 2 times of code elements in the past.
In addition, it is to possess that another form of modulating device of the present invention is adopted the structure of being taked: delay the device group, each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poor; Nyquist filter forms the Nyquist signal respectively from the code element of above-mentioned 4 systems; The the 1st and the 2nd quadrature modulator, import the Nyquist signal of delaying difference of the integral multiple in 1/4 cycle that has code-element period respectively, use the frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal to export alternately the Nyquist signal of being imported; And the modulation signal that will be obtained by the 1st quadrature modulator and use the carrier wave of preset frequency to carry out the 3rd positive intermodulation device of quadrature modulation by the modulation signal that the 2nd quadrature modulator is obtained.
If adopt this formation, just can realize not enlarging bandwidth, accommodate the modulation signal of 2 times signal in the past.Simultaneously, available switching component and shift register etc. constitute the 1st and the 2nd quadrature modulator.
The structure that a form of demodulating equipment of the present invention is taked is to possess: the 1st and the 2nd Nyquist signal is carried out the modulation signal that quadrature modulation forms, the quadrature demodulator that uses the cosine wave of frequency of the odd-multiple of the fundamental frequency with above-mentioned Nyquist signal to carry out quadrature demodulation.
In addition, the structure that another form of demodulating equipment of the present invention is taked is to possess:, input modulating signal uses predetermined carrier frequency that this modulation signal is carried out quadrature demodulation, thereby obtains the 1st quadrature demodulator of the 1st and the 2nd restituted signal; The cosine wave of frequency of odd-multiple that use has the fundamental frequency of above-mentioned Nyquist signal carries out quadrature demodulation to the 1st restituted signal, thereby obtains the 2nd quadrature demodulator of the 3rd and the 4th restituted signal; And the cosine wave of frequency that uses the odd-multiple of the fundamental frequency with above-mentioned Nyquist signal, the 2nd restituted signal is carried out quadrature demodulation, thereby obtain the 3rd quadrature demodulator of the 5th and the 6th restituted signal.
In addition, the structure that another demodulating equipment of the present invention is taked is to possess: input modulating signal, the cosine wave of frequency of odd-multiple that use has the fundamental frequency of above-mentioned Nyquist signal carries out quadrature demodulation to this modulation signal, thereby obtains the 1st quadrature demodulator of the 1st and the 2nd restituted signal; Use predetermined carrier frequency that above-mentioned the 1st restituted signal is carried out quadrature demodulation, thereby obtain the 2nd quadrature demodulator of the 3rd and the 4th restituted signal; And use predetermined carrier frequency that above-mentioned the 2nd restituted signal is carried out quadrature demodulation, thereby obtain the 3rd quadrature demodulator of the 5th and the 6th conciliation signal.
By above-mentioned formation, the modulation signal that demodulation well uses modulating device demodulation of the present invention to form obtains restituted signal.
Wireless communication system of the present invention adopts has the formation of above-mentioned modulating device and above-mentioned demodulating equipment.
If adopt these constitute just can be implemented in and same in the past frequency on by in the past 2 times of wireless communication systems that transmission speed communicates.
As mentioned above, if adopt the present invention, just can realize the modulation system of the frequency utilization efficient more than 2 times in the past.
It is that the application number that proposes in 2003-35750, on May 14th, 2003 is that the application number that proposes in 2003-136610 and on November 12nd, 2003 is the Japanese patent application of 2003-382985 that this specification is based on the application number that proposed on February 13rd, 2003.Its full content is contained in this.
The possibility of utilizing on the industry.
The present invention is widely used in radio communication, for example, be suitable for the mobile communication telephone set and Its base station etc.
Claims (13)
1, a kind of the 1st input symbols and the 2nd input symbols are carried out the modulator approach of quadrature modulation, comprising:
With the Nyquist signal of above-mentioned the 1st input symbols with this Nyquist signal has been given the Nyquist signal of above-mentioned the 2nd input symbols of delaying difference of integral multiple in 1/4 cycle of the code-element period of above-mentioned input symbols, the cosine wave of frequency of odd-multiple that use will have the fundamental frequency of above-mentioned Nyquist signal carries out quadrature modulation as carrier wave.
2, modulator approach as claimed in claim 1 comprises:
Each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poorly, Nyquist is shaped, thereby obtains to have the step of the 1st～the 4th Nyquist signal of delaying difference in 1/4 cycle of code-element period;
The cosine wave of frequency of odd-multiple of fundamental frequency that will have above-mentioned Nyquist signal is as carrier wave, respectively the 1st and the 2nd Nyquist signal of delaying difference in 2/4 cycle with code-element period and the 3rd, the 4th Nyquist signal of delaying difference with 2/4 cycle of code-element period carried out the primary modulation step of quadrature modulation; And
Use the carrier wave of predetermined frequency, the orthogonal demodulation signal of the orthogonal demodulation signal of the above-mentioned the 1st and the 2nd Nyquist signal that are obtained through the primary modulation step and above-mentioned the 3rd, the 4th Nyquist signal is carried out the secondary modulation step of quadrature modulation.
3, modulator approach as claimed in claim 1 comprises:
Each of the input symbols of 4 systems is given code-element period 1/4 cycle delay poorly, Nyquist is shaped, thereby obtains to have the step of the 1st～4 Nyquist signal of delay difference in 1/4 cycle of code-element period;
The the 1st and the 2nd Nyquist signal of delaying difference in 1/4 cycle with code-element period and the 3rd and the 4th Nyquist signal of delaying difference with 1/4 cycle of code-element period are carried out the primary modulation step of quadrature modulation with the carrier wave of preset frequency; And
The cosine wave of frequency of odd-multiple that will have the fundamental frequency of above-mentioned Nyquist uses as carrier wave, respectively to the orthogonal demodulation signal of the above-mentioned the 1st and the 2nd Nyquist signal that from above-mentioned primary modulation step, are obtained and the above-mentioned the 3rd and the orthogonal demodulation signal of the 4th Nyquist signal carry out the secondary modulation step of quadrature modulation.
4, a kind of modulating device comprises:
Import the 1st Nyquist signal relevant and this Nyquist signal is had the 2nd Nyquist signal relevant of delaying difference of integral multiple in 1/4 cycle in input symbols cycle, use the cosine wave of frequency of the odd-multiple of fundamental frequency this 1st and the 2nd Nyquist signal to be carried out the quadrature modulator of quadrature modulation with these Nyquist signals with the 2nd input symbols with the 1st input symbols.
5, modulating device as claimed in claim 4 comprises:
Each of the input symbols of 4 systems is given code-element period 1/4 cycle delay difference delay the device group;
Form the nyquist filter of Nyquist signal respectively from the code element of above-mentioned 4 systems;
Input has the Nyquist signal of delaying difference in 2/4 cycle of code-element period respectively, the Nyquist signal imported is used the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal carry out the 1st and the 2nd quadrature modulator of quadrature modulation as carrier wave; And
The modulation signal that will be obtained by above-mentioned the 1st quadrature modulator and use the carrier wave of preset frequency to carry out the 3rd positive intermodulation device of quadrature modulation by the modulation signal that above-mentioned the 2nd quadrature modulator is obtained.
6, modulating device as claimed in claim 4 comprises:
Each of the input symbols of 4 systems is given code-element period 1/4 cycle delay difference delay the device group;
Form the nyquist filter of Nyquist signal respectively from the code element of above-mentioned 4 systems;
Import the Nyquist signal of delaying difference of the odd-multiple in 1/4 cycle that has code-element period respectively, and the carrier wave of use preset frequency carries out the 1st and the 2nd quadrature modulator of quadrature modulation; And
The modulation signal that will be obtained by above-mentioned the 1st quadrature modulator and use the cosine wave of frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal to carry out the 3rd positive intermodulation device of quadrature modulation as carrier wave by the modulation signal that above-mentioned the 2nd quadrature modulator is obtained.
7, a kind of modulating device comprises:
Each of the input symbols of 4 systems is given code-element period 1/4 cycle delay difference delay the device group;
Form the nyquist filter of Nyquist signal respectively from the code element of above-mentioned 4 systems;
Input has the Nyquist signal of delaying difference of integral multiple in 1/4 cycle of code-element period respectively, the 1st and the 2nd quadrature modulator that uses the frequency of the odd-multiple of the fundamental frequency that will have above-mentioned Nyquist signal to export alternately to the Nyquist signal imported; And
The modulation signal that will be obtained by above-mentioned the 1st quadrature modulator and use the carrier wave of preset frequency to carry out the 3rd positive intermodulation device of quadrature modulation by the modulation signal that above-mentioned the 2nd quadrature modulator is obtained.
8, a kind of demodulating equipment comprises:
The modulation signal that the 1st and the 2nd Nyquist signal is formed by quadrature modulation, the quadrature demodulator that uses the cosine wave of frequency of the odd-multiple of fundamental frequency to carry out quadrature demodulation with above-mentioned Nyquist signal.
9, demodulating equipment as claimed in claim 8 comprises:
Input modulating signal uses predetermined carrier frequency that this modulation signal is carried out quadrature demodulation, thereby obtains the 1st quadrature demodulator of the 1st and the 2nd restituted signal;
The cosine wave of frequency of odd-multiple that use has the fundamental frequency of above-mentioned Nyquist signal carries out quadrature demodulation to above-mentioned the 1st restituted signal, thereby obtains the 2nd quadrature demodulator of the 3rd and the 4th restituted signal; And
The cosine wave of frequency of odd-multiple that use has the fundamental frequency of above-mentioned Nyquist signal carries out quadrature demodulation to above-mentioned the 2nd restituted signal, thereby obtains the 3rd quadrature demodulator of the 5th and the 6th restituted signal.
10, demodulating equipment as claimed in claim 8 comprises:
Input modulating signal uses the cosine wave of frequency of the odd-multiple of the fundamental frequency with above-mentioned Nyquist signal that this modulation signal is carried out quadrature demodulation, thereby obtains the 1st quadrature demodulator of the 1st and the 2nd restituted signal;
Use predetermined carrier frequency that above-mentioned the 1st restituted signal is carried out quadrature demodulation, thereby obtain the 2nd quadrature demodulator of the 3rd and the 4th restituted signal; And
Use predetermined carrier frequency that above-mentioned the 2nd restituted signal is carried out quadrature demodulation, thereby obtain the 3rd quadrature demodulator of the 5th and the 6th conciliation signal.
11, a kind of wireless communication system possesses modulating device as claimed in claim 4 and demodulating equipment as claimed in claim 8.
12, a kind of wireless communication system possesses modulating device as claimed in claim 5 and demodulating equipment as claimed in claim 9.
13, a kind of wireless communication system possesses modulating device as claimed in claim 6 and demodulating equipment as claimed in claim 10.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003136610 | 2003-05-14 | ||
| JP136610/2003 | 2003-05-14 | ||
| JP382985/2003 | 2003-11-12 |
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|---|---|
| CN1810003A true CN1810003A (en) | 2006-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200480017378 Pending CN1810003A (en) | 2003-05-14 | 2004-05-14 | Modulation method, modulation apparatus, demodulation apparatus, and radio communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720998A (en) * | 2014-12-18 | 2016-06-29 | 英特尔Ip公司 | Apparatus and method for generating a transmit signal |
| CN111289961A (en) * | 2018-12-06 | 2020-06-16 | 罗伯特·博世有限公司 | Multivalue resolution for MIMO radar systems |
-
2004
- 2004-05-14 CN CN 200480017378 patent/CN1810003A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720998A (en) * | 2014-12-18 | 2016-06-29 | 英特尔Ip公司 | Apparatus and method for generating a transmit signal |
| CN105720998B (en) * | 2014-12-18 | 2018-12-18 | 英特尔Ip公司 | For generating the device and method for sending signal |
| CN111289961A (en) * | 2018-12-06 | 2020-06-16 | 罗伯特·博世有限公司 | Multivalue resolution for MIMO radar systems |
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