CN100574164C - Radio communications system, transmitter, receiver and communication, method of sending and receiving - Google Patents

Abstract

Transmitter side uses the encoding digital signals of sign indicating number to sending that does not contain any DC component, and does not use any carrier wave to send digital signal.Receiver side carries out with the corresponding decoding of coding so that recover raw digital signal the signal that receives.

Description

Radio communications system, transmitter, receiver and communication, method of sending and receiving

Technical field

The present invention relates to radio communications system, radio transmitter, radio receiver, radio communication method, radio transmission method and radio receiving method, relate more specifically to the weak radio communication of short distance by electromagnetic wave transmission/receiving digital signals.

Background technology

In radio communication, it is difficult directly sending direct current (DC) signal or low frequency signal.Generally, sort signal sends by information being modulated to high frequency carrier.More particularly, transmitter side with to send the signal wave modulated carrier, send modulated wave.Receiver side carries out demodulation to the modulated wave that receives, and extracts signal wave and the data that obtain to be sent out (are seen for example reference book: Hideo ohba﹠amp from carrier wave; Hideki Sagesaka, " Radio CommunicationDevice ", Nihon Riko Shuppankai, pp.141-265, ISBN 4-89019-136-4).

Figure 32 illustrates the ios dhcp sample configuration IOS DHCP of general radio communication system.In Figure 32, VCO (voltage-controlled oscillator) 1001 produces carrier wave at transmitter side.Carrier wave is modulated, promptly carrier wave be multiply by the baseband signal IN that will send with multiplier 1002.Modulated wave is amplified by PA (power amplifier) 1005, sends from transmitting antenna 1006.At receiver side, the modulated wave that is received by reception antenna 1011 is amplified by LNA (low noise amplifier) 1012, and iconic element is suppressed by image carrier rejects trap 1013.The therefrom repressed modulated wave quilt of iconic element promptly multiply by modulated wave the carrier wave that is produced by VCD1016 with multiplier 1017 to down-conversion.Modulated wave passes through from channel selection filter 1018, is converted to the baseband signal of transmission again by detector 1019.Figure 32 illustrates the example of the radio communication of adopting PSK (phase-shift keying) method.In another kind of radio communication method, radio communication is generally with producing carrier wave and the method for carrier modulation/demodulation being realized.

As the system that does not use any carrier wave to communicate, a kind of radio communications system (for example PCT (WO) 2003-529273 (WO01/073965) and PCT (WO) 2003-535552 (WO 01/093441)) of employing UWB (ultra broadband) technology has been proposed.The UWB transmitter sends the utmost point pulse of base in short-term, per second 1,000,000,000 time or more in the very broadband of several GHz.It is data that receiver receives from the pulse train of transmitter and with pulses switch.

As mentioned above, the general radio communication system shown in Figure 32 produces carrier wave when sending, and reception, modulating/demodulating carrier wave communicate with radio.Therefore, radio communications system requires to produce the circuit and the carrier modulation/demodulator circuit of carrier wave.It is complicated that radio communications system becomes, and constitutes the transmitter of radio communications system and the scale of receiver and the size of hardware and increase, and the cost of radio communications system and power consumption rise.

Use the radio communications system of UWB also to require to produce the wide in short-term monocycle ripple or the circuit of Gauss's pulse.It is difficult that design becomes, and needs the high frequency analog circuits technology because form sort circuit.Constitute the transmitter of radio communications system and the scale of receiver and the size of hardware and increase, the cost of radio communications system and power consumption rise.

Summary of the invention

The present invention who has made has overcome common shortcoming, its purpose provides a kind of radio communications system, radio transmitter, radio receiver, radio communication method, radio transmission method and radio receiving method, it can exempt the needs to the circuit that produces carrier wave and carrier modulation/demodulation, and realize simple system, low cost and low power consumption.

Radio communications system according to the present invention comprises radio transmitter and radio receiver, radio transmitter comprises code device, it is used for the encoding digital signals to sending, and transmitting antenna, it sends by the code device encoded signals, radio receiver comprises reception antenna, it receives the signal that has sent, and code translator, it is used for the signal that reception antenna receives is carried out and the corresponding decoding of coding, and the recovery digital signal, wherein, communication does not use any carrier wave to carry out.

In ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, the code device digital signal encoding of sign indicating number that does not contain any DC component to sending.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and to transmitting antenna output spread signal, code translator comprises expanding unit, and it is used for the signal that reception antenna receives is carried out going expansion with spread processing is corresponding, and recovers digital signal.

In the ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, extended code does not contain any DC component.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and signal generation device, its response is by the rising and the decline of the signal of expanding unit expansion, produce pulse signal, and to the transmitting antenna output pulse signal, code translator comprises expanding unit, and it is used for the signal that reception antenna receives is carried out and corresponding expansion and the peak detector of going of spread processing, it is used to detect by the described peak value that goes expanding unit to remove the signal expanded, and recovers digital signal.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and signal generation device, its response is by the rising and the decline of the signal of expanding unit expansion, produce pulse signal, and to the transmitting antenna output pulse signal, code translator comprises signal reproducing apparatus, and it is used for from regenerate spread signal and remove expanding unit of the signal that reception antenna receives, it is used for the spread signal of signal reproducing apparatus output is carried out going expansion with spread processing is corresponding, and recovers digital signal.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and signal generation device, its response is by the rising and the decline of the signal of expanding unit expansion, produce pulse signal, and to the transmitting antenna output pulse signal, code translator comprises signal reproducing apparatus, it is used for from the signal that reception antenna the receives spread signal of regenerating, with remove expanding unit, it is used for the spread signal of signal reproducing apparatus output is carried out and corresponding expansion and the peak detector of going of spread processing, it is used to detect by the described peak value that goes expanding unit to remove the signal expanded, and recovers digital signal.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and signal generation device, its response is by the rising and the decline of the signal of expanding unit expansion, produce pulse signal, and to the transmitting antenna output pulse signal, code translator comprises expanding unit, it is used for the signal that reception antenna receives is carried out expanding with corresponding the going of spread processing, integrating gear, it is gone expanding unit to remove the signal integration of expanding to quilt, and peak detector, it is used to detect the peak value from the signal of integrating gear output, and recovers digital signal.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, code device comprises expanding unit, it multiply by extended code by the digital signal that will send, carry out spread processing, and signal generation device, its response is by the rising and the decline of the signal of expanding unit expansion, produce pulse signal, and to the transmitting antenna output pulse signal, code translator comprises expanding unit, its use with by the corresponding extended code of the spread signal of differential, the signal that reception antenna is received goes expansion, and peak detector, it is used to detect by the described peak value that goes expanding unit to remove the signal expanded, and recovers digital signal.

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, make Δ S for by the spread signal of differential, C be and the corresponding extended code of spread signal Δ S, and P is the correlation between spread signal Δ S and the extended code C, and M is the code length of extended code C, foundation

$P\≈\underset{k=1}{\overset{M}{\mathrm{\Σ}}}({\mathrm{\ΔS}}_k\·\underset{r=k}{\overset{M}{\mathrm{\Σ}}}{C}_r)$

In another ios dhcp sample configuration IOS DHCP according to radio communications system of the present invention, signal generation device is only exported the pulse signal in n (n is not less than 2 integer) the subharmonic frequency band of expanding spreading rate.

Radio transmitter according to the present invention comprises code device, and it is used for the encoding digital signals that will send, and transmitting antenna, and it sends by the code device encoded signals, wherein, sends digital signal and does not use any carrier wave.

Radio receiver reception according to the present invention is from the signal of radio transmitter, the encoding digital signals of described transmitter to sending, do not use any carrier wave to send digital signal, described receiver comprises reception antenna, it receives and has sent signal, and code translator, it is used for the signal that reception antenna receives is carried out and the corresponding decoding of coding, and recovers digital signal.

Radio communication method according to the present invention comprises the coding step to the encoding digital signals that will send, send the transmitting step of coded signal in the coding step, receive the receiving step that has sent signal, with the data that receive in the receiving step are carried out with the corresponding decoding of coding and recover the decoding step of digital signal, wherein, any carrier wave is not used in communication.

Radio transmission method according to the present invention comprises the coding step to the encoding digital signals that will send, and sends the transmitting step of coded signal, wherein, sends digital signal and does not use any carrier wave.

According to the present invention, from the digital signal encoding that will send not being used any carrier wave send the radio receiving method of the transmitter side received signal of digital signal, comprise that reception has sent the receiving step of signal, with the data that receive in the receiving step are carried out with the corresponding decoding of coding and recover the decoding step of digital signal, and recover the decoding step of digital signal.

Description of drawings

Fig. 1 is the configuration block diagram according to the radio communications system of first embodiment of the invention;

Fig. 2 is the figure of various sign indicating numbers used in the encoder according to first embodiment of the invention;

Fig. 3 is the power spectrum chart of various sign indicating numbers used in the encoder according to first embodiment of the invention;

Fig. 4 is the configuration block diagram of the radio communications system of the second and the 3rd embodiment according to the present invention;

Fig. 5 is the ios dhcp sample configuration IOS DHCP block diagram that removes expanding unit according to second embodiment of the invention;

Fig. 6 A is the signal waveforms according to baseband signal in the radio transmitter of second embodiment of the invention;

Fig. 6 B is the signal waveforms of the spread signal in the radio transmitter;

Fig. 6 C is the signal waveforms of the radio signal in the radio transmitter;

Fig. 7 A is the amplifying signal oscillogram of Fig. 6 A;

Fig. 7 B is the amplifying signal oscillogram of Fig. 6 B;

Fig. 7 C is the amplifying signal oscillogram of Fig. 6 C;

Fig. 8 A is the signal waveforms that removes spread signal in the radio receiver according to second embodiment of the invention;

Fig. 8 B is the signal waveforms of the baseband signal in the radio receiver;

Fig. 9 A is the amplifying signal oscillogram of Fig. 8 A;

Fig. 9 B is the amplifying signal oscillogram of Fig. 8 B;

Figure 10 is the transmission signal spectrum figure according to second embodiment of the invention;

Figure 11 is the configuration block diagram according to the radio communications system of fourth embodiment of the invention;

Figure 12 A is the signal waveforms that inputs to according to the spread signal of the signal generation device of fourth embodiment of the invention;

Figure 12 B and 12C are the signal waveforms from the rectangular signal of signal generation device output;

Figure 12 D is the spectrogram of spread signal;

Figure 12 E is the spectrogram of rectangular signal;

Figure 13 A is the signal waveforms of baseband signal in the 4th the radio transmitter according to the present invention;

Figure 13 B is the signal waveforms of the spread signal in the radio transmitter;

Figure 13 C is the signal waveforms of the pulse signal in the radio transmitter;

Figure 14 A is the amplifying signal oscillogram of Figure 13 A;

Figure 14 B is the amplifying signal oscillogram of Figure 13 B;

Figure 14 C is the amplifying signal oscillogram of Figure 13 C;

Figure 15 A is the signal waveforms that removes spread signal in the radio receiver according to fourth embodiment of the invention;

Figure 15 B is the signal waveforms of the baseband signal in the radio receiver;

Figure 16 A is the amplifying signal oscillogram of Figure 15 A;

Figure 16 B is the amplifying signal oscillogram of Figure 15 B;

Figure 17 is the configuration block diagram according to radio receiver in the radio communications system of fifth embodiment of the invention;

Figure 18 A is the signal waveforms according to regeneration spread signal in the radio receiver of fifth embodiment of the invention;

Figure 18 B is the signal waveforms of the baseband signal in the radio receiver;

Figure 19 A is the amplifying signal oscillogram of Figure 18 A;

Figure 19 B is the amplifying signal oscillogram of Figure 18 B;

Figure 20 A, 20B, 20C, 20D and 20E are the ios dhcp sample configuration IOS DHCP block diagrams according to the signal reproducing apparatus of fifth embodiment of the invention;

Figure 21 is the configuration block diagram according to radio receiver in the radio communications system of sixth embodiment of the invention;

Figure 22 A is the signal waveforms according to regeneration spread signal in the radio receiver of sixth embodiment of the invention;

Figure 22 B is the signal waveforms that removes spread signal in the radio receiver;

Figure 22 C is the signal waveforms of baseband signal;

Figure 23 A is the amplifying signal oscillogram of Figure 22 A;

Figure 23 B is the amplifying signal oscillogram of Figure 22 B;

Figure 23 C is the amplifying signal oscillogram of Figure 22 C;

Figure 24 is the configuration block diagram according to radio receiver in the radio communications system of seventh embodiment of the invention;

Figure 25 A is the signal waveforms that removes spread signal according to seventh embodiment of the invention;

Figure 25 B is the signal waveforms of the pulse signal in the radio receiver;

Figure 25 C is the signal waveforms of baseband signal in the radio receiver;

Figure 26 A is the amplifying signal oscillogram of Figure 25 A;

Figure 26 B is the amplifying signal oscillogram of Figure 25 B;

Figure 26 C is the amplifying signal oscillogram of Figure 25 C;

Figure 27 is the configuration block diagram according to radio receiver in the radio communications system of eighth embodiment of the invention;

Figure 28 is the ios dhcp sample configuration IOS DHCP block diagram that removes expanding unit according to eighth embodiment of the invention;

Figure 29 A is the signal waveforms of the spread signal that will send;

Figure 29 B is the signal waveforms according to received signal in the radio receiver of eighth embodiment of the invention;

Figure 29 C is the signal waveforms that removes spread signal in the radio receiver;

Figure 30 A is the signal waveforms of the digital signal that will send;

Figure 30 B is the signal waveforms that removes spread signal in the radio receiver according to eighth embodiment of the invention;

Figure 31 is the transmission signal step spectrogram according to ninth embodiment of the invention;

Figure 32 is the ios dhcp sample configuration IOS DHCP block diagram of general radio communication system.

Embodiment

Preferred embodiment according to radio communications system of the present invention, radio transmitter, radio receiver, radio communication method, radio transmission method and radio receiving method is described below with reference to the accompanying drawings, as first to the 9th embodiment respectively.

[first embodiment]

According to the radio communications system of first embodiment without carrier wave, but by not containing the digital signal encoding of sign indicating number to sending of any DC component, and at transmitter side transmission code signal, two carry out and the corresponding decoding of coding to received signal, and recover the method for digital signal, transmission/receiving digital signals at receiver side.First embodiment is described below with reference to the accompanying drawings.

Fig. 1 provides the configuration block diagram of the radio communications system of first embodiment.In Fig. 1, radio communications system is made of radio transmitter 1 and radio receiver 2.Radio transmitter 1 comprises encoder 11, power amplifier 12 and transmitting antenna 13.Radio receiver 2 comprises reception antenna 21, LNA22 and decoder 23.

Below the operation of radio communications system will be described with signal flow.In Fig. 1, the digital signal IN that send inputs to encoder 11.The digital signal IN that sends can take any form, as long as digital signal IN represents bifurcation information.Digital signal IN is unipolarity NRZ baseband signal normally, as shown in Figure 2.First embodiment also adopts unipolarity NRZ signal.

Encoder 11 uses the sign indicating number that does not contain any DC component that supplied with digital signal is encoded.By coding, will have around the unipolarity NRZ baseband signal of the spectrum peak of DC component and be converted to the signal that mainly comprises quite high-frequency AC signal.The example that does not contain the sign indicating number of any DC component is bipolarity NRZ sign indicating number (AMI sign indicating number (alternative-mark negate sign indicating number)) and a Manchester code (dicode or SP sign indicating number) as shown in Figure 2, in addition, BnZS sign indicating number (bipolar code that replaces n zero point, n is an integer), HDBn sign indicating number (high-density bipolar code; N is an integer), mBnT sign indicating number (m binary code on n ternary code; M and n are integers), CMI sign indicating number (coding mark negate sign indicating number) and DMI sign indicating number (differential mode negate sign indicating number).But sign indicating number is not limited to these.Unipolarity NRZ shown in Figure 2 (non-return-to-zero), unipolarity RZ (making zero) and bipolarity NRZ (non-return-to-zero) have around the living lobe of the power spectrum of DC, are not suitable at first embodiment as sign indicating number.Fig. 3 represents the characteristic of the multiple sign indicating number of power spectrum.

Offer power amplifier 12 by encoder 11 encoded signals.The signal that is provided by encoder 11 is provided power amplifier 12, then it is exported to transmitting antenna 13.In many cases, the power that sends signal strict regulations in the radio communication a little less than short distance, at this moment power amplifier 12 is always unessential.Surpass particular value even signal when encoder 11 outputs directly offer antenna 13 when sending signal power, signal power can replace power amplifier 12 regulate by inserting an attenuator.The signal amplitude of digital signal that is used in 12 pairs of encoders of power amplifier 11 output of first embodiment is amplified, and conversion digital signal not.This just need not use analog circuit at transmitter side, therefore can realize simple transmitter design and low cost.

The signal that transmitting antenna 13 provides by radio transmitting power amplifier 12 (when required power amplifier 12 not, signal is provided by encoder 11).Transmitting antenna 13 receives the rectangle digital signals and no matter have/inactivity amplifier 12.With regard to the spectrum of digital signal, the signal in transmitting antenna 13 frequency bands is used as radio signal and sends.Antenna can not be propagated any DC component, can only propagate the AC signal component.Therefore, the digital signal that will send, from transmitting antenna 13 send mainly be rectangular signal rising/decline the time the AC component.

As mentioned above, radio transmitter 1 sends coded baseband signal IN and does not use any carrier wave, particularly the high frequency carrier of any simulation.Therefore, radio transmitter 1 is not equipped with and uses the desired circuit of carrier wave, for example produces the VCO of carrier wave and takes advantage of the multiplier of carrier wave with baseband signal.

Below receiver side will be described, reception antenna 21 receives the signal that is sent by transmitting antenna 13, and exports this signal to LNA22.The received signal that LNA22 amplification reception antenna 21 provides also suppresses noise, exports this signal to decoder 23 again.23 pairs of signals from the LNA22 input of decoder carry out and the corresponding decoding of the coding of encoder 11, recover digital signal.From the signal of LNA22 output is analog signal, and when digital signal awaited the simulated operation recovery, the signal of exporting from LNA22 was directly used in operation.When digital signal awaits digit manipulation and recovers, then in decoder, arrange comparator or amplitude limiter, with signal limiter to predetermined amplitude and approximate rectangular ripple.After this, the corresponding decoding of coding of limitation signal experience and encoder 11 recovers digital signal.

In first embodiment, decoder 23 adds comparator and amplitude limiter.But, the invention is not restricted to this configuration, can take any configuration until amplitude limiter, so that after amplifying received signal and inhibition noise, can obtain square wave.For example, LNA22 can be equipped with the function that is equivalent to comparator and amplitude limiter.In addition, can be from the output of LNA22 by the A/D converter digitlization to carry out digit manipulation.

As mentioned above, radio receiver 2 receives the signal that does not use the particularly any simulation high frequency carrier of any carrier wave to send.Therefore, radio receiver 2 does not comprise the necessary circuit of use carrier wave, for example produces the VCO of carrier wave and the multiplier that rectangular signal is taken advantage of carrier wave.

The reason of why not using any carrier wave also can finish radio communication will be described below.Radio communication can only send the AC component, can not send any DC component.Therefore, be difficult to send the baseband signal that has around the spectrum peak of DC component.On the contrary, the signal with the power spectrum main lobe in the AC component can communicate, as long as be sent out/receive as the AC signal component of main lobe, even suppress to be sent out/to receive around the signal component of DC.Thus, the radio transmitter 1 of first embodiment uses the sign indicating number that does not contain any DC component, the digital signal IN that send is encoded, so that the main lobe of power spectrum becomes the AC component.First embodiment can realize not using the radio communication of carrier wave.In more detail, when using Manchester code to 150MHz unipolarity NRZ signal encoding, the main lobe of power spectrum drops within DC to the 300MHz scope.The signal of spectrum peak is arranged in quite high frequency band (about tens MHz to 200MHz), and the available bandwidth antenna sends/receives.

Because long antenna becomes more necessary for the lower frequency of AC component, so the digital signal that will send preferably has high frequency.For example, frequency can be taken as 1MHz or higher, is preferably 100MHz or higher.

As mentioned above, according to first embodiment, the digital signal IN that send uses the sign indicating number coding that does not contain any DC component, is converted to the high-frequency AC component so that will send the main lobe of the power spectrum of signal.Possibility is finished in burst transmissions communication, does not use any carrier wave can finish radio communication.Producing the needed VCO of carrier wave, up-conversion and the needed multiplier of down-conversion or the like all can exempt.The radio transmitter 1 of construction system and the hardware size of radio receiver 2 greatly reduce, and can realize simple system, low cost and low power consumption.

Specifically, radio transmitter 1 directly sends rectangular signal, and the main processing of radio transmitter 1 is a Digital Signal Processing.Therefore many analog circuits can greatly reduce, and cost and power consumption also can greatly reduce.

First embodiment does not adopt and produces the pulse generator that the monocycle ripple forms Gaussian pulse, but drives transmitting antenna with rectangular signal.The frequency band that this method can select signal post to use in the antenna frequency band that uses.If use the antenna of centre frequency, then finish communication by the radio wave in this frequency band of transmission/reception as hundreds of MHz.If using centre frequency is the antenna of several GHz, then finish communication by the wireless wave in this frequency band of transmission/reception.In both cases, adjust the antenna that uses so that the baseband signal that will send is dropped in the frequency band range that uses antenna.More particularly, the deration of signal T of rectangular signal shown in Figure 2 is reduced.Adopt little deration of signal T, the frequency component that is included in the signal upwards is distributed to the upper frequency side.Deration of signal T is by the clock frequency control of supplying with digital circuit, and clock frequency can be by frequency synthesizer controls.According to this method, the frequency synthesizer of antenna and transmitter is controlled according to the frequency band that uses.Because frequency synthesizer can be by software control, so the hardware construction element that changes with frequency of utilization has only antenna.As mentioned above, this method needs only by switched antenna just can change employed frequency, and does not need to change other hardware construction elements of transmitter.In contrast, the general radio communication system of use UWB need produce the pulse generator of monocycle waveform or Gauss's pulse.The adjustment of pulse generator and installation will make the frequency component of monocycle waveform or Gauss's pulse drop in the predetermined frequency band range.It is difficult designing such pulse generator, because be that analog circuit by high frequency constitutes.The design pulse generator is so that the frequency component of monocycle waveform or Gauss's pulse is variable, and is then more difficult.That is to say, use the general radio communication system of UWB that the pulse generator that is tuned to the employed frequency band of communication must be installed.Even switch the antenna that uses, but the pulse generator that changes as transmitter hardware composed component is difficult.The frequency band that signal post uses also just can not change.

[second embodiment]

According to the radio communications system of second embodiment with according to the radio communications system of first embodiment much at one.Radio communications system according to second embodiment is characterised in that: the digital signal that its transmitter side will send multiply by extended code, carries out the processing of spread-spectrum, goes extension process to received signal at receiver side.Second embodiment is described below with reference to the accompanying drawings, and the description of the omission and the first embodiment common ground.

Fig. 4 is the configuration block diagram according to the radio communications system of second embodiment.In Fig. 4, radio communications system is made of radio transmitter and radio receiver 4.Radio transmitter 3 comprises extended code generator 31, multiplier 32, power amplifier 33 and transmitting antenna 34.Radio receiver 4 comprises reception antenna 41, LNA42, removes expanding unit 43 and peak detector 44.In a second embodiment, extended code generator 31 and multiplier 32 form encoder, go expanding unit 43 and peak detector 44 to form decoder.

Below the operation of radio communications system will be described with signal flow.In Fig. 4, the digital signal IN that send inputs to multiplier 32.Multiplier 32 multiply by the extended code that is produced by extended code generator 31 with the digital signal IN of input, carries out Direct-Spread and handles.In other words, extended code generator 31 and multiplier 32 play expanding unit, and its digital signal that will send multiply by extended code and carries out spread processing.Direct-Spread is handled and in the frequency band of broadness unipolarity NRZ signal is expanded.Spread signal is amplified by power amplifier 33, and sends from transmitting antenna 34.

Be similar to first embodiment, second embodiment is required power amplifier 33 always not.If desired during power amplifier 33, the signal amplitude of digital signal is amplified and the power amplifier of conversion digital signal not, be similar to first embodiment with regard to adopting.Transmitter can be realized simple transmitter design and low cost without any need for analog circuit.Under any circumstance, be similar to second embodiment, the rectangle digital signal that send offers the transmitting antenna 34 among second embodiment.

At receiver side, the signal that sends from transmitting antenna 34 is received by reception antenna 41, and LNA42 amplifies, and offers expanding unit 43.Go expanding unit 43 to carry out the expansion of going corresponding to the spread processing of radio transmitter 3.Peak detector 44 detects from the signal peak that goes expanding unit 43 to export, and according to the peak value demodulation digital signal that detects.

Fig. 5 illustrates the ios dhcp sample configuration IOS DHCP that removes expanding unit 43 that uses in a second embodiment.Go expanding unit 43 to comprise: sampling/maintenance (S/H) circuit 431a to 431g, it is to taking a sample/keep from the spread signal of LNA42 input; Sampling/retentive control circuit 432, it receives the first clock f1 and sampling that sampling/holding circuit 431a to 431g is carried out in succession/maintenance operation is controlled; Circuits for triggering 433a to 433f, it constitutes shift register, and the signal and the clock f1 of sampling/retentive control circuit 432 outputs are shifted synchronously; Extended code produces circuit 434, and it produces and uses the synchronous relevant extended code of spread signal of second clock f2; Multiplier 435a to 435g, it will take a sample/and extended code that the spread signal and the extended code of holding circuit 431a to 431g output produces the corresponding signal that circuit 434 exports multiplies each other; Adder 436 with the signal plus that multiplier 435a to 435g is exported.The first clock f1 has with transmitter side signal is expanded the identical frequency of used clock, and second clock f2 has the identical frequency of clock that is used to produce extended code with transmitter side.

Sampling/retentive control circuit 432 receives the first clock f1, and only with a clock in each clock that quantitatively equals multiplier 435a to 435g, produces the sampling/retentive control signal that is used to take a sample and keeps spread signal.When the sampling/retentive control signal that goes expanding unit 433a to 433g that sampling/retentive control circuit 432 is exported that forms shift register, carry out and clock f1 synchronously as shown in Figure 5 during right shift, go expanding unit 433a to 433g to sampling/holding circuit 431b to 431g output sampling/retentive control signal.Sampling/holding circuit 431a to 431g carries out the sampling synchronous with clock f1/maintenance operation in succession.Extended code produces circuit 434 and produces and the synchronous extended code of clock f2.

Carry out multiplying each other of corresponding signal from LNA 42 inputs and by the spread signal of sampling/holding circuit 431a to 431g maintenance with from the extended code of extended code generation circuit 434 outputs by multiplier 435a to 435g.Product from multiplier 435a to 435g is exported summation by adder 436 additions.Carry out the correlation operation between spread signal and the local extended code thus, peak detector 44 recovers baseband signal based on the result of correlation operation.The example that second embodiment adopts the configuration conduct among Fig. 5 to remove expanding unit 43, but configuration is not limited to this, as long as can obtain identical functions.

Fig. 6 and 7 illustrates radio transmitter 3 mid point A (input of multiplier 32), the some B (output of multiplier 32) of Fig. 4 and the type signal waveform of some C (output of transmitting antenna 34).Fig. 7 amplifies and illustrates the part P1 of signal waveform among Fig. 6.Ordinate among Fig. 6 and Fig. 7 is represented signal strength signal intensity, the abscissa express time.Signal shown in Fig. 6 A and the 7A is the digital signal IN that will send.Signal shown in Fig. 6 B and the 7B is the spread signal after digital signal IN expands with extended code.Transmitting antenna 34 send as radio signal, be included in the AC signal in the spread signal rising/decline, shown in Fig. 6 C and 7C.

Fig. 8 and 9 illustrates the radio receiver 4 mid point D (going the output of expanding unit 43) of Fig. 4 and the type signal waveform of some E (output of peak detector 44).Fig. 9 amplifies and illustrates the part P2 of signal waveform among Fig. 8.When spread signal that sends and local extended code meet each other, export peak signal, shown in Fig. 8 A and 9A.The phasing back of peak signal and the phasing back of baseband signal are synchronous.By the phasing back of peak detector 44 detection peak signals, the baseband signal of transmission just can be recovered, as shown in Fig. 8 B and 9B.

As mentioned above, be similar to first embodiment, radio transmitter 3 and radio receiver 4 send and receive and do not use the particularly high-frequency carrier signal of any simulation of any carrier wave.Radio transmitter 3 and radio receiver 4 are not equipped with and use the desired circuit of carrier wave.

In a second embodiment, the digital signal IN that send handles the paramount frequency of expansion by Direct-Spread, does not use any carrier wave can finish radio communication, and its reason is identical with first embodiment.More particularly, when using extended code expansion 1MHz unipolarity NRZ signal at the 300MHz spreading rate, the main lobe of spread signal frequency spectrum extends to 300MHz from DC.Note, if after going to expand the ratio (SI is than (signal-to-jamming ratio)) of the received power of desirable ripple and disturbing wave power be higher than obtain the needed SI of the desired reception error rate than the time, Direct-Spread is handled communication can be carried out.SI ratio if necessary can be guaranteed, though tradable frequency band depends on the frequency band of used antenna, also needn't send/receive the whole of main lobe.Even when the frequency spectrum of the spread signal of the quite high frequency side of transmissions/reception only, it also is possible communicating by letter.

Figure 10 illustrates the signal spectrum that sends among second embodiment.Main lobe in the baseband signal of 300MHz spreading rate expansion extends to 300MHz from DC.For example, when the frequency of used antenna when 100MHz is changed to 300MHz, the signal spectrum that send is partly represented with the hatching among Figure 10.

Radio communications system according to second embodiment also has following effect except the effect identical with first embodiment.

More particularly, multiply each other, can obtain the multiple channel in the radio communications system with extended code.By transmission/reception spread signal on broad frequency band, can increase distance and bit rate.Handle owing to carry out Direct-Spread, so can obtain the effect identical (for example, anti-multipath disturbs) with the spread spectrum communication effect.

[the 3rd embodiment]

According to the radio communications system of the 3rd embodiment with according to the radio communications system of second embodiment much at one, be to use the extended code that does not contain any DC component to carry out spread processing according to the radio communications system feature of the 3rd embodiment.Below the 3rd embodiment will be described, and the description of the omission and the second embodiment common ground.

In the 3rd embodiment, extended code generator 31 produces the extended code that does not contain any DC component, and extended code is offered multiplier 32.For example, extended code generator 31 at first produces the extended code of unipolarity NRZ signal, use the sign indicating number that does not contain any DC component that extended code is encoded, and the extended code that will encode offers multiplier 32.But, the invention is not restricted to these processes, as long as produce the extended code that does not contain any DC component.

The power spectrum of the extended code of unipolarity NRZ signal centers on the DC peaking, and uses for example extended code peaking in the AC component of Manchester code coding.For example when the extended code with 150MHz spreading rate adopted Manchester code to encode, the main lobe of power spectrum almost dropped in DC to the 300MHz scope, and power spectrum mainly is quite high-frequency AC signal component.Use the extended code of encoding as new extended code, can obtain having the transmission signal of AC signal component spectrum peak by Manchester code.Therefore, except the effect identical, also has following effect according to the radio communications system of the 3rd embodiment with the radio communications system of second embodiment.That is to say that it mainly is the AC component that radio communications system is handled, can realize the system of high efficiency, low-power consumption than using unipolarity NRZ extended code more effectively to send/receive.

Be similar to first embodiment, the 3rd embodiment is required power amplifier 33 always not.Even required power amplifier 33 amplifies and the power amplifier of conversion digital signal not the signal amplitude of digital signal with regard to adopting, be similar to first embodiment.Transmitter can be realized simple transmitter design and low cost without any need for analog circuit.Under any circumstance, be similar to first embodiment, the rectangle digital signal that send offers the transmitting antenna 34 among the 3rd embodiment.

[the 4th embodiment]

In the radio communications system according to the 4th embodiment, transmitter side takes advantage of the digital signal that will send to carry out spread processing with extended code, and the rising/decline of the spread signal of spread processing has been experienced in response, produces and send the pulse type rectangular signal.Receiver side carries out expanding with corresponding the going of spread processing to the signal that receives, and detects the peak value that removes spread signal and recovers digital signal.In this way, the digital signal of any carrier wave is not used in the 4th embodiment transmission/reception.The 4th embodiment is described below with reference to the accompanying drawings.

Figure 11 is the configuration block diagram according to the radio communications system of fourth embodiment of the invention.In Figure 11, radio communications system is made of radio transmitter 5 and radio receiver 6.Radio transmitter 5 comprises extended code generator 111, multiplier 112, signal generation device 113, power amplifier 114 and transmitting antenna 115.Radio receiver 6 comprises reception antenna 121, low noise amplifier (LNA) 122, removes expanding unit 123 and peak detector 124.In the 4th embodiment, extended code generator 111, multiplier 112 and signal generation device 113 form encoder, go expanding unit 123 and peak detector 124 to form decoder.

Below the operation of radio communications system will be described with signal flow.In Figure 11, the digital signal that send (baseband signal) IN inputs to multiplier 112.Extended code generator 111 produces extended code.Multiplier 112 multiply by extended code with the digital signal IN that imports and carries out the Direct-Spread processing.That is to say that extended code generator 111 and multiplier 112 multiply by extended code by the digital signal that will send, and work to carry out the expanding unit of spread processing.Direct-Spread is handled expansion of digital signal IN on broadband.

The spread signal of multiplier 112 outputs offers signal generation device 113.Rising/the decline of signal generation device 113 response spread signals produces the pulse type rectangular signal.As signal generation device 113, can utilize differentiator, high pass filter, band pass filter or the like.When using high pass filter or band pass filter, available passive component, perhaps exportable with the result of digital filter as the derivation operation of signal processing.Under any circumstance, signal generation device 113 is not confined to these especially, produces the function of pulse type rectangular signal as long as signal generation device 113 has the rising of response spread signal and descends.

Figure 12 illustrates the signal waveform example of signal generation device 113 outputs.Signal waveform shown in Figure 12 A is the spread signal waveform that is input to signal generation device 113.Signal waveform shown in Figure 12 B and the 12C is the signal waveform of signal generation device 113 outputs.Signal generation device 113 outputs are corresponding to the rectangular signal of spread signal rising/decline.Figure 12 D illustrates the frequency spectrum of the spread signal that is input to signal generation device 113, and Figure 12 E illustrates from the frequency spectrum of the rectangular signal of signal generation device 113 outputs.Because the deration of signal rectangular signal narrower than spread signal exported from signal generation device 113, so compare with the frequency spectrum shown in Figure 12 D, the distribution of the frequency spectrum main lobe of rectangular signal extends to the high frequency side shown in Fig. 2 E widely.Thus, when the spreading rate of the spread signal that will send is so not high, the rectangular signal that just uses signal generation device 113 to produce corresponding to spread signal rising/decline, as shown in Figure 12.Signal power can extend to high frequency side, more effectively sends.

Power amplifier 114 amplifies from the rectangular signal of signal generation device 113 outputs, transmitting antenna 115 by radio transmitting through power amplifier 114 amplifying signals.

Be similar to first embodiment, the 4th embodiment is required power amplifier 114 always not.If desired during power amplifier 114, the signal amplitude of digital signal is amplified and the power amplifier of conversion digital signal not, be similar to first embodiment with regard to adopting.Transmitter can be realized simple transmitter design and low cost without any need for analog circuit, under any circumstance, is similar to first embodiment, and the rectangle digital signal that send offers the transmitting antenna 115 among the 4th embodiment.

Figure 13 and 14 illustrates some A (input of multiplier 112), the some B (output of multiplier 112) in the radio transmitter 5 of Figure 11 and puts the type signal waveform of C (output of signal generation device 113).Figure 14 amplifies and illustrates the part P3 of the signal waveform among Figure 13.The ordinate of Figure 13 and 14 is represented signal strength signal intensity, the abscissa express time.Figure 13 and 14 illustrates signal waveform, and at that time, the spreading rate when digital signal IN is expanded is higher than 100 times of spreading rate when using PN31 extended code expansion of digital signal IN, and differentiator is as signal generation device 113.

Signal shown in Figure 13 A and the 14A is the digital signal IN that will send.Signal shown in Figure 13 B and the 14B is the spread signal after digital signal IN expands with extended code.Signal shown in Figure 13 C and the 14C is the pulse signal after the spread signal differential.Figure 14 C shows the rising/decline of spread signal of response point B and the pulse type rectangular signal that obtains at a C.

In this way, can obtain the pulse signal corresponding to the similar pulse of the spread signal rising/decline of a B, differentiator plays signal generation device 113 effects.

As mentioned above, the rectangular signal that the radio transmitter 5 of the 4th embodiment sends corresponding to the spread signal rising/decline that will send, and do not use the particularly any simulation high frequency carrier of any carrier wave.Radio transmitter 5 does not need to produce the circuit and the carrier modulation/demodulator circuit of carrier wave, for example voltage controlled oscillator (VCO) and multiplier.

The following describes radio receiver 6.The signal that sends from transmitting antenna 115 by reception antenna 121 receive, LNA122 amplifies and offer expanding unit 123.

The pulse signal that goes 123 pairs of LNA122 outputs of expanding unit is carried out going expansion with the spread processing of radio transmitter 5 is corresponding, and will go spread signal to offer peak detector 124.Go to expand and comprise that method for synchronous promptly carries out promptly carrying out expanding with nonsynchronous the going of code phase with phase locked expansion and the asynchronous method of going of the signal code that inputs to expanding unit 123.The 4th embodiment adopts and removes expanding unit 123 synchronously.Go synchronously expanding unit to adopt various delay lock loops (DLLS) usually, but go expanding unit 123 not to be confined to them especially.

Peak detector 124 detects from the signal peak that goes expanding unit 123 to export, and recovers digital signal (baseband signal).

Figure 15 and 16 illustrates the some D (going expanding unit 123 outputs) in Figure 11 radio receiver 6 and puts the type signal waveform of E (peak detector 124 outputs).Figure 16 amplifies and illustrates the part P4 of the signal waveform among Figure 15.Signal by the some D that goes expanding unit 123 to go to expand is and the corresponding peak signal of high/low level that sends digital signal.In case the signal of acceptance point D, the digital signal that peak detector 124 detection peak and recovery have sent is shown in Figure 15 B and 16B.

As mentioned above, radio receiver 6 receives the digital signal of not using the particularly any simulation high frequency carrier of any carrier wave to send.Radio receiver 6 does not need to produce the circuit and the carrier wave demodulation circuit of carrier wave, for example VCO and multiplier.

The reason that why can finish radio communication without carrier wave will be described below.Radio communication can only send the AC component, and can not send any DC component.Because it is difficult that transmission has around the baseband signal of the spectrum peak of DC component, so high frequency carrier is usually by high modulation.

On the contrary, according to the radio communications system of the 4th embodiment, handle the digital signal IN that will send by Direct-Spread and extend to high frequency, and, can send high-frequency signal effectively by spread signal production burst shape rectangular signal.The ratio of the received power of desirable ripple and disturbing wave power after going to expand (SI than) be higher than obtain the needed SI of the desired reception error rate than the time, Direct-Spread is handled communication can be carried out.SI specific energy is if necessary guaranteed, though tradable frequency band depends on the frequency band of used antenna, also needn't send/whole main lobes of received power spectrum.Even when the frequency spectrum of the spread signal of the suitable high frequency band side of transmissions/reception only, it also is possible communicating by letter, and is similar to the 4th embodiment.

More particularly, when using it to produce the rectangular signal width and be 1/100 signal generation device of the 3MHz spread signal deration of signal, the power spectrum of signal extends to 300MHz from DC.For example, the antenna with 100MHz to 300MHz broadband can be used to send/receive the frequency spectrum of spread signal.When with spreading rate being the extended code expansion 1MHz baseband signal of 300MHz, the main lobe of spread signal power spectrum extends to 300MHz from DC.When using passband as 100MHz or higher digital high-pass filter during as signal generation device 113, the main lobe of the spread signal power spectrum that passes through from signal generation device 113 almost drops in 100MHz to the 300MHz scope.Utilize broad-band antenna, can send/receive the frequency spectrum of spread signal.As a result, the 4th embodiment realizes the radio communication without carrier wave.

As mentioned above, according to the 4th embodiment, the digital signal IN experience that send directly expansion produces rectangular signal.Burst transmissions communication becomes possibility, does not use any carrier wave wireless telecommunication to finish.The simulation high-frequency circuit be can remove from and the needed VCO of carrier wave and up-conversion and the needed multiplier of down-conversion for example produced.The radio transmitter 5 of formation system and the hardware size of radio receiver 6 can greatly reduce, and can realize simple system, low cost and low power consumption.

In addition, the 4th embodiment realize with extended code multiply each other and radio communications system in multiple channel.By at broad frequency band transmission/reception spread signal, can increase distance and bit rate, can obtain for example anti-multipath effects of jamming, be similar to spread spectrum communication.Because main processing of radio transmitter 5 is Digital Signal Processing, so many analog circuits greatly reduce, cost and power consumption also can greatly reduce.

Except the effect identical with the radio communications system of second embodiment arranged, also has following effect according to the radio communications system of the 4th embodiment.That is to say, use signal generation device can send high frequency component signal effectively.

[the 5th embodiment]

To describe according to a fifth embodiment of the invention below.According to the radio communications system of the 5th embodiment in configuration with identical according to the radio communications system of the 4th embodiment, difference is the configuration of radio receiver.Below with reference to description of drawings the 5th embodiment, and the description of omission and the 4th embodiment common ground.

Figure 17 is according to the configuration of the radio receiver in the radio communications system of the 5th embodiment block diagram.As mentioned above, radio transmitter 5 have with the 4th embodiment in the identical configuration of transmitter, in Figure 17, do not illustrate.

Radio receiver 7 according to the 5th embodiment comprises reception antenna 131, low noise amplifier (LNA) 132, signal reproducing apparatus 133 and removes expanding unit 134.In the 5th embodiment, signal reproducing apparatus 133 and go expanding unit 134 to form decoders.

The signal that sends from radio transmitter 5 by reception antenna 131 receive, LNA132 amplifies and offer signal reproducing apparatus 133.Signal reproducing apparatus 133 detects the pulse signal of LNA132 output, the rectangle spread signal that regeneration is handled by the signal generation device of radio transmitter 5 before this, and spread signal offered expanding unit 134.As signal reproducing apparatus 133, can utilize matched filter, the integrator that uses operational amplifier, comparator or the like.With regard to matched filter, can use passive component, perhaps the result of the operation of exportable CCD, analog or Digital Signal Processing.Under any circumstance, signal reproducing apparatus 133 is not particularly limited, as long as regenerate spread signal when the received pulse signal.

Go the spread signal of 134 pairs of signal reproducing apparatus of expanding unit, 133 outputs to carry out expanding, recover digital signal (baseband signal) thus with corresponding the going of the spread processing of radio transmitter 5.Go to expand and comprise that method for synchronous promptly carries out expanding with synchronous the going of the code phase that inputs to expanding unit 134 and asynchronous method promptly carries out not setting up the synchronous expansion of going with code phase.The 5th embodiment uses and removes expanding unit synchronously.Go synchronously expanding unit to utilize various delay lock loops (DDLs) usually, but go expanding unit 134 not to be confined to them especially.

Figure 18 and 19 illustrates the some F (output of signal reproducing apparatus 133) in Figure 17 and the radio receiver 7 and puts the signal waveform of G (going the output of expanding unit 134).Figure 19 amplifies and illustrates the part P5 of signal waveform among Figure 18.When signal reproducing apparatus 133 detects the pulse type radio signal and carries out Regeneration Treatment, obtain the spread signal shown in Figure 18 A and the 19A.When going expanding unit 134 to receive spread signal and going to expand, recover the digital signal shown in Figure 18 B and the 19B.The signal that is received by reception antenna 131 can be thought of as the phase place of modulated pulse signal and the signal that makes, and C represents as Figure 11 point.Signal reproducing apparatus 133 has the function of enough detection pulse signal peak value polarity and exports high or low level signal.

Figure 20 A, 20B, 20C, 20D and 20E illustrate the example of signal reproducing apparatus 133 configurations.Signal reproducing apparatus 133 constitutes (Figure 20 A) by for example matched filter 1331 and peak detector 1332.If the use matched filter can use the corresponding matched filter of pulse signal shape that sends with radio transmitter 5, can from the signal that reception antenna 131 receives, detect pulse signal selectively.The signal peak of matched filter 1331 outputs is detected by peak detector 1332, and the rectangle spread signal is renewable.

Shown in Figure 20 B, signal reproducing apparatus 133 can be made of matched filter 1331 and integrator 1333, by the signal integration of 1333 pairs of matched filters of the integrator 1331 output spread signal of regenerating.

Shown in Figure 20 C, signal reproducing apparatus 133 can be made of matched filter 1331 and comparator 1334, makes the signal bifurcationization of the matched filter 1331 output spread signal of regenerating by comparator 1334.

Shown in Figure 20 D, signal reproducing apparatus 133 can be made of multiplier 1335 and 1 digit counter 1336, with the envelope detection of 1335 pairs of LNA132 output signals of multiplier, counts the spread signal of regenerating with 1336 pairs of envelope detection signals of 1 digit counter.In detection by multiplier 1335 and square-law envelope detection, rising/declines of response LNA132 output signal and generation pulse.Because rising and decline always alternately appear in the signal of LNA132 output, so can be by the fixed interval between the envelope detection pulse to high level or low level recovered spread signal.When pulse of multiplier 1335 outputs, 1 digit counter 1336 becomes high or low level signal of output.

Shown in Figure 20 E, signal reproducing apparatus 133 can be made of diode 1337 and 1 digit counter 1336, with the envelope detection of 1337 pairs of LNA132 output signals of diode, counts the spread signal of regenerating with 1 digit counter, 1336 counting envelope detection signals.Under any circumstance, as long as being not limited to these configurations, signal reproducing apparatus 133 has identical function.

As mentioned above, the digital signal according to radio receiver 7 receptions of the 5th embodiment do not use the particularly any simulation high frequency carrier of any carrier wave to send is similar to the 4th embodiment.Radio receiver 7 does not need to produce the circuit and the carrier wave demodulation circuit of carrier wave, for example VCO and multiplier.

The 5th embodiment has the effect identical with the 4th embodiment.In addition, with pulse signal directly go the expansion comparatively speaking, the 5th embodiment is easy to make and spends spread demodulation, because the rectangle spread signal is to be reproduced and to go to expand from the pulse signal that has sent.

Because go the processing gain of spread demodulation, the spread signal of exporting from signal reproducing apparatus 133 can comprise error slightly, and perhaps spread signal needs not to be accurate rectangular signal, and these can not restrain communication.

[the 6th embodiment]

Various details the 6th embodiment.According to the radio communications system of the 6th embodiment in configuration with identical according to the radio communications system of the 4th embodiment, difference is the configuration of radio receiver.The 6th embodiment is described with reference to the accompanying drawings, and the description of omission and the 4th embodiment common ground.

Figure 21 is the configuration block diagram according to radio receiver in the radio communications system of the 6th embodiment.As mentioned above, radio transmitter 5 have with the 4th embodiment in the identical configuration of transmitter, in Figure 21, do not illustrate.

Radio receiver 8 according to the 6th embodiment comprises reception antenna 141, low noise amplifier (LNA) 142, signal reproducing apparatus 143, removes expanding unit 144 and peak detector 145.In the 6th embodiment, signal reproducing apparatus 143, go expanding unit 144 and peak detector 145 to constitute decoders.

The signal that sends from radio transmitter 5 by reception antenna 141 receive, LNA142 amplifies and offer signal reproducing apparatus 143.

Be similar to the signal reproducing apparatus 133 of the 5th embodiment, signal reproducing apparatus 143 is from the signal regeneration of the LNA142 output rectangle spread signal handled of the signal generation device of radio transmitter 5 before this, and spread signal is offered expanding unit 144.

Go the spread signal of 144 pairs of signal reproducing apparatus of expanding unit, 143 outputs to carry out going expansion, and will go spread signal that peak detector 145 is provided with the spread processing of radio transmitter 5 is corresponding.Go to expand and comprise that method for synchronous promptly carries out expanding with synchronous the going of the code phase of the spread signal that is input to expanding unit 144 and asynchronous method carries out well not setting up the synchronous expansion of going with code phase.The 6th embodiment uses the asynchronous expanding unit that goes.As the asynchronous expanding unit that goes, can use for example matched filter of SAW device of passive component, adopt the matched filter of CCD, analog or Digital Signal Processing also can use, perhaps can use configuration shown in Figure 5.But, go expanding unit 144 not to be limited to these especially, as long as can carry out the asynchronous expansion decoding of going.

Peak detector 145 detects the signal peak that goes expanding unit 144 outputs, and recovers digital signal (baseband signal).

Figure 22 and 23 illustrates some H (output of signal reproducing apparatus 143), the some I (going the output of expanding unit 144) in Figure 21 radio receiver 8 and puts the typical waveform of J (output of peak detector 145).Figure 23 amplifies and illustrates the part P6 of signal waveform among Figure 22.When signal reproducing apparatus 143 detects the pulse type radio signal and carries out Regeneration Treatment, just obtain the spread signal shown in Figure 22 A and the 23A.As shown in Figure 22 B and 23B, when going expanding unit 144 to receive spread signal and going to expand, the part of the digital signal of then regenerating.Peak detector 145 receives and goes spread signal, detection peak and recover the digital signal shown in Figure 22 C and the 23C.

As mentioned above, the digital signal according to radio receiver 8 receptions of the 6th embodiment do not use the particularly any simulation high frequency carrier of any carrier wave to send is similar to the 4th embodiment.Therefore, radio receiver 8 does not need to produce the circuit and the carrier wave demodulation circuit of carrier wave, for example VCO and multiplier.

The 6th embodiment has the effect identical with the 5th embodiment.In addition, compare with removing synchronously expanding unit, the 6th embodiment can reduce hardware size and can reduce power consumption, because go to expand asynchronous carrying out.

[the 7th embodiment]

Various details the 7th embodiment.Identical in the configuration of radio transmitter 5 with radio communications system according to the 4th embodiment according to the radio communications system of the 7th embodiment, difference is the configuration of radio receiver.Below with reference to description of drawings the 7th embodiment, and the explanation of omission and the 4th embodiment common ground.

Figure 24 is the configuration block diagram according to the radio receiver in the radio communications system of the 7th embodiment.As mentioned above, radio transmitter 5 have with the 4th embodiment in the identical configuration of transmitter, show at Figure 24 diagrammatic sketch.

Radio receiver 9 according to the 7th embodiment comprises reception antenna 151, low noise amplifier (LNA) 152, removes expanding unit 153, integrating gear 154 and peak detector 155.In the 7th embodiment, go expanding unit 153, integrating gear 154 and peak detector 155 to constitute decoder.

The signal that sends from radio transmitter 5 by reception antenna 151 receive, LNA152 amplifies and offer expanding unit 153.

Go the signal of 153 pairs of LNA152 outputs of expanding unit to carry out going expansion, and spread signal is offered integrating gear 154 with the spread processing of radio transmitter 5 is corresponding.Go to expand comprise method for synchronous promptly carry out with the code phase of spread signal that inputs to expanding unit 153 synchronous go expansion and asynchronous method promptly to carry out code phase not set up the synchronous expansion of going.The 7th embodiment uses the asynchronous expanding unit that goes.Put as asynchronous, can use for example matched filter of SAN device of passive component, adopt the matched filter of CCD, analog or Digital Signal Processing also can use, perhaps can use configuration shown in Figure 5.But go expanding unit 153 not to be confined to these especially, as long as it can carry out the asynchronous expansion decoding of going.

154 pairs of integrating gears carry out integration by the signal that goes expanding unit 153 to go to expand, and the signal of integration offers peak detector 155.As integrating gear 154, can use matched filter, also can use the operational amplifier of integration operation, perhaps can use comparator circuit.About matched filter, can use passive component, perhaps or output by the integration operation result of CCD, analog or Digital Signal Processing.But integrating gear 154 is not confined to these especially.

Peak detector 155 detects the signal peak of integrating gear 154 outputs, and recovers digital signal (baseband signal).

Figure 25 and 26 illustrates some K (going the output of expanding unit 153), the some L (output of integrating gear 154) in Figure 24 radio receiver 9 and puts the typical waveform of M (output of peak detector 155).Figure 26 amplifies and illustrates the part P7 of signal waveform among Figure 25.The asynchronous expanding unit 153 paired pulses shape radio signals of going are gone expansion.Go expanding unit 153 phase place of the pulse signal shown in Figure 25 A and the 26A to be modulated according to the high/low level of the digital signal that has sent, and output phase-modulation signal.Integrating gear 154 detects the phase place of pulse signal, and output and the corresponding peak signal of institute's detected phase, as shown in Figure 25 B and 26B.Peak detector 155 detection peak signals, and based on the digital signal shown in peak value recovery Figure 25 C that is detected and the 26C.

As mentioned above, the digital signal according to radio receiver 9 receptions of the 7th embodiment do not use the particularly any simulation high frequency carrier of any carrier wave to send is similar to the 4th embodiment.Radio receiver 9 does not need to produce the circuit and the carrier wave demodulation circuit of carrier wave, for example VCO and multiplier.

The 7th embodiment has the effect identical with the 6th embodiment.

[the 8th embodiment]

Various details the 8th embodiment.Identical in the configuration of radio transmitter 5 with radio communications system according to the 4th embodiment according to the radio communications system of the 8th embodiment, difference is the configuration of radio receiver.Below with reference to description of drawings the 8th embodiment, and the description of omission and the 4th embodiment common ground.

Figure 27 is according to the configuration block diagram of radio receiver in the radio communications system of the 8th embodiment.As mentioned above, radio transmitter 5 have with the 4th embodiment in the identical configuration of transmitter, in Figure 27, do not illustrate.

Radio receiver 10 according to the 8th embodiment comprises reception antenna 161, low noise amplifier (LNA) 162, removes expanding unit 163 and peak detector 164.In the 8th embodiment, go expanding unit 163 and peak detector 164 to constitute decoder.

When spread signal directly sends from transmitting antenna, when perhaps producing the corresponding signal of rising/decline with spread signal, from the high fdrequency component of antenna transmission spread signal then from antenna transmission.At this moment, the signal of transmission is received by the radio receiver 9 according to the 7th embodiment, and stands to expand the signal that obtains shown in Figure 25 A and 26A.Use set-point as the center and no matter send the high/low level of signal, positive and negative peak value shows as no DC component and propagates the influence that causes, because reverse according to the high/low level that transmits data from the signal phase that goes expanding unit 153 outputs, so as described in the 7th embodiment, communication can be finished by the phase place of determining output signal.

The 7th embodiment needs integrating gear 154, is used to determine the phase place of spread signal.Narrow down from the increase of the width of the peak signal of going expanding unit 153 output with the spreading rate of spread signal.Therefore, be difficult to determine the phase place of the signal shown in Figure 25 A and the 26A along with the increase of spreading rate.

The 8th embodiment by in going extension process to going the extended code sequence to carry out the problem that given conversion has solved the 7th embodiment.The following describes the conversion of extended code sequence.

If S is spread signal, C is that extended code and P are the correlation between spread signal S and the extended code C, and then correlation P is provided by following formula

$P={\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_1\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_2+\&CenterDot;\&CenterDot;\&CenterDot;+{\mathrm{<figure-callout\; id="31"\; label="C"\; filenames="C2004800001320036H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_{31}\&CenterDot;{\mathrm{<figure-callout\; id="31"\; label="S"\; filenames="C2004800001320036H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_{31}$

$={\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_1\&CenterDot;\underset{i=-\&infin;}{\overset{1}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;S}}_i+{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_1\&CenterDot;\underset{i=-\&infin;}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;S}}_i+\&CenterDot;\&CenterDot;\&CenterDot;+{\mathrm{<figure-callout\; id="31"\; label="C"\; filenames="C2004800001320036H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_{31}\&CenterDot;\underset{i=-\&infin;}{\overset{31}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;S}}_i$

$=({\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+\&CenterDot;\&CenterDot;\&CenterDot;+C_{31})\&CenterDot;\underset{i=-\&infin;}{\overset{0}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;S}}_i$

$+({\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+\&CenterDot;\&CenterDot;\&CenterDot;C_{31})\&CenterDot;{\mathrm{\&Delta;<figure-callout\; id="1"\; label="S"\; filenames="C2004800001320034H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_1$

$+({\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">C</figure-callout>}}_2+\&CenterDot;\&CenterDot;\&CenterDot;+C_{31})\&CenterDot;{\mathrm{\&Delta;<figure-callout\; id="2"\; label="S"\; filenames="C2004800001320033H1.png,C2004800001320035H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_2\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right)$

$+\&CenterDot;\&CenterDot;\&CenterDot;$

$+\left(C_{31}\right)\&CenterDot;{\mathrm{\&Delta;<figure-callout\; id="31"\; label="S"\; filenames="C2004800001320036H1.png"\; state="\{\{state\}\}">S</figure-callout>}}_{31}$

$=\underset{k}{\mathrm{\&Sigma;}}{C}_k\&CenterDot;S_0+\underset{k=1}{\overset{31}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{31}{\mathrm{\&Sigma;}}}{C}_r)$

The operation of the high fdrequency component by radio propagation spread signal S is equal to for spread signal S differentiate (differential modulated).In equation (1), the length of extended code C is 31, and Δ S carries out derivation operation (differential modulated) and the signal that makes to spread signal S.

Because according to the character of extended code C, Be almost 0, so correlation P is essentially

$P\&ap;\underset{k=1}{\overset{31}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{31}{\mathrm{\&Sigma;}}}{C}_r)\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right)$

Usually, the length M of extended code C is provided by following formula:

$P\&ap;\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{M}{\mathrm{\&Sigma;}}}{C}_r)\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right)$

That is to say that the correlation peaks signal can get by with the extended code C that satisfies equation (3) the high fdrequency component Δ S of spread signal being carried out the correlation computing.

Figure 28 is the ios dhcp sample configuration IOS DHCP block diagram that removes expanding unit 163 according to the 8th embodiment.In the example of Figure 28, the length M of extended code C is 7.The expanding unit 163 that goes of Figure 28 comprises: comparator circuit 631, and it will be converted to the synchronous digital signal with the first clock f1 from the high fdrequency component Δ S of the spread signal of LNA162 input, and clock f1 has with spread signal and expands the identical frequency of used clock; (N-1) delay circuit 632a to 632g, its output be that the one-period of the delayed first clock f1 of signal of comparator circuit 631 output is to (N-1) individual signal of (N-1) individual cycle (N be 2 or bigger integer) gained; The extended code that produces extended code C produces circuit 633; N multiplier 634a to 634g, they multiply each other the signal of delay circuit 632a to 632g output respectively with the extended code C that produces circuit 633 outputs from extended code; Adder 635 with the signal plus that multiplier 634a to 634g is exported.

Comparator circuit 631 is determined spread signal to be converted to the level of each periodic input signal of the first clock f1 1 bit digital data of high or low level, and to export this data based on predetermined threshold value.Delay circuit 632a is the one-period of the signal delay clock f1 of comparator circuit 631 output, and it is also same as described above to export the signal that postpones the operation of delay circuit 632b and multiplier 634a delay circuit 632b to 632f to.Delay circuit 632g is the one-period of the signal delay clock f1 of delay circuit 632f output, and exports the signal that postpones to multiplier 634g.

Extended code produces circuit 633 and produces extended code C.When the extended code sequence that is used for transmitter side expansion be 1,0,0,1,1,1, during 0}, then be used to the extended code sequence expanded for calculate by equation (3) 1,0,1,2,1,0,1}.The signal that the signal of delay circuit 632a to 632g output and extended code produce circuit 633 outputs is multiplied each other by corresponding signal by multiplier 634a to 634g.The multiplication of multiplier 634a to 634g is by adder 635 additions, and adder 635 is exported summations.

Peak detector 164 detects the peak value of adder 635 output signals, and the output baseband signal.

Figure 29 illustrates some Q (signal of reception) in the radio receiver 10 of the spread signal S that will send and Figure 27 and the typical waveform of some K (going the output of expanding unit 163).Figure 29 B illustrates from spread signal S shown in Figure 29 A of antenna transmission, the signal that is received by the antenna 161 of radio receiver 10.When going expanding unit 163 to remove the signal of expander graphs 29B, obtain the signal shown in Figure 29 C.In Figure 29 C, just win positive peak signal from the central value upside, different with Figure 25 A and 26A.

Figure 30 illustrates the example that time interval was wherein prolonged by the time interval among Figure 29.Figure 30 A is the signal waveforms of data-signal (baseband signal) IN that will send, and Figure 30 B is the signal waveforms of the K (going the output of expanding unit 163) in the radio receiver 10.

As mentioned above, according to the 8th embodiment, utilize the extended code C that satisfies equation (3) can obtain and send the corresponding polarity peak signal of high/low level of signal.The 8th embodiment does not need to use any integrating gear of determining the phase place of spread signal, baseband signal even can carry out demodulation with the high spreading rate of spread signal.

Note,, can replace comparator circuit 631 and the delay circuit 632a to 632g in the expanding unit 163 of going of the 8th embodiment with sampling/holding circuit that synchronous the taking a sample in succession of the first clock f1/keeps operated.

[the 9th embodiment]

Below the ninth embodiment of the present invention will be described.In second to the 8th embodiment, transmission be the frequency band that extends to 100MHz to 300MHz the spread signal frequency spectrum main lobe of 300MHz from DC.The transmission diagrams of signal spectrum of second to the 8th embodiment is in Figure 10.

On the contrary, in the 9th embodiment, the pulse signal of only the n time beyond the output expansion spreading rate frequency band (n be 2 or bigger integer) harmonic band, and from signal generation device 113 transmissions.The transmission diagrams of signal spectrum of the 9th embodiment is in Figure 31.In the example of Figure 31, only send the second harmonic frequency band (300 to 600MHz) of spreading rate.The frequency band of the spread signal frequency spectrum bottom for example frequency band BA among Figure 31 is sent out, and when increasing transmission output in the scope of exporting according to for example radio principle rule, efficient reduces.In the 9th embodiment, only just can finish by the signal that sends the 9th subharmonic frequency band.Effective transmission according to transmission output.

The present invention can be applied to the radio communication by radio wave transmission/receiving digital signals.

Claims (8)

1. a radio communications system comprises radio transmitter and radio receiver, and described radio transmitter comprises: code device, and it is used for the encoding digital signals to sending; And transmitting antenna, it sends by described code device encoded signals, and described radio receiver comprises: reception antenna, it receives the signal that has sent; And code translator, its signal that is used for that described reception antenna is received carries out and the corresponding decoding of coding, and recovers digital signal,

Wherein, communication does not use any carrier wave to carry out;

Described code device comprises: expanding unit, its digital signal that will send multiply by extended code and carry out spread processing; And signal generation device, the rising and the decline of the signal that its response is expanded by described expanding unit produce pulse signal, and to described transmitting antenna output pulse signal and

Described code translator comprises: remove expanding unit, it uses and by the corresponding extended code of the spread signal of differential, the signal that described reception antenna is received goes expansion; And peak detector, it is used to detect by the described peak value that goes expanding unit to remove the signal expanded, and recovers digital signal.

2. according to the radio communications system of claim 1, it is characterized in that: make Δ S for by the spread signal of differential, C be and the corresponding extended code of spread signal Δ S, and P is the correlation between spread signal Δ S and the extended code C, and M is the code length of extended code C, foundation

$P\&ap;\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{M}{\mathrm{\&Sigma;}}}{C}_r).$

3. according to the radio communications system of claim 1, it is characterized in that: described signal generation device is only exported pulse signal in the nth harmonic frequency band with the expansion spreading rate, and wherein n is not less than 2 integer.

4. radio receiver, it receives the signal from radio transmitter, and the encoding digital signals of described radio transmitter to sending do not use any carrier wave to send digital signal, and described radio receiver comprises:

Reception antenna, its receive the signal sent and

Code translator, it is used for the signal that described reception antenna receives is carried out and the corresponding decoding of coding, and recovers digital signal;

Wherein, described radio receiver receives the signal from radio transmitter, and described radio transmitter response produces pulse signal by the rising and the decline of the spread signal that the digital signal that will send carried out spread processing and obtain, and do not use any carrier wave send pulse signal and

Described code translator comprises: remove expanding unit, it uses and by the corresponding extended code of the spread signal of differential, the signal that described reception antenna is received goes expansion; And peak detector, it is used to detect by the described peak value that goes expanding unit to remove the signal expanded, and recovers digital signal.

5. according to the radio receiver of claim 4, it is characterized in that: make Δ S for by the spread signal of differential, C be and the corresponding extended code of spread signal Δ S, and P is the correlation between spread signal Δ S and the extended code C, and M is the code length of extended code C, foundation

$P\&ap;\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{M}{\mathrm{\&Sigma;}}}{C}_r).$

6. radio communication method, comprise: to the coding step of the encoding digital signals that will send, send the forwarding step of coded signal in the coding step, receive the receiving step that has sent signal, with the signal that receives in the receiving step is carried out with the corresponding decoding of coding and recovers the decoding step of digital signal

Wherein, do not use any carrier wave to communicate,

Coding step comprises: to the digital signal that will send multiply by that extended code is carried out the rising of the spread step of spread processing and the signal of response in the spread step and the signal that produces pulse signal of descending produce step and

The decoding step comprises: use and gone spread step and detect peak value that removes to be gone in the spread step signal expanded and the peak detection step of recovering digital signal what the signal that receives in the receiving step went to expand by the corresponding extended code of the spread signal of differential.

7. according to the radio communication method of claim 6, it is characterized in that: make Δ S for by the spread signal of differential, C be and the corresponding extended code of spread signal Δ S, and P is the correlation between spread signal Δ S and the extended code C, and M is the code length of extended code C, foundation

$P\&ap;\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}({\mathrm{\&Delta;S}}_k\&CenterDot;\underset{r=k}{\overset{M}{\mathrm{\&Sigma;}}}{C}_r).$

8. according to the radio communication method of claim 6, it is characterized in that: produce in the step at signal, only export the pulse signal in the nth harmonic frequency band under the expansion spreading rate, wherein n is not less than 2 integer.

Images