CN1114327C - Wireless transmission method and device - Google Patents
Wireless transmission method and device Download PDFInfo
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- CN1114327C CN1114327C CN 99103849 CN99103849A CN1114327C CN 1114327 C CN1114327 C CN 1114327C CN 99103849 CN99103849 CN 99103849 CN 99103849 A CN99103849 A CN 99103849A CN 1114327 C CN1114327 C CN 1114327C
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Abstract
The present invention relates to a wireless transmission method and a wireless transmission device. Bidirectional wireless communication is carried out between a base station and a plurality of terminal platforms through spectrum spread signals of which the spectrums are spread by prescribed codes, wherein in the base station, prescribed definite time is used for generating the codes; the signals, which are spread in the spectrums by the codes and are used as a reference, are sent; in each terminal platform, the signals from the base station are received and are used for synchronously generating the codes with receiving definite time; prescribed signals of which the spectrums are spread by the generated codes are sent; in the base station, the signals transmitted by the terminal platforms are received; definite time error data between the generated codes in the base station and detected codes in the received signals are sent to the terminal platforms.
Description
The present invention relates to be applicable to (Code Division Multiple Access: code division multiple access) radio transmitting method of the system that communicates of mode and the radio transmitting device that uses this radio transmitting method with CDMA.
In radio telephone system, developing the system that uses the communication mode that is called the CDMA mode.In the wireless transmission of carrying out according to this CDMA mode is handled, at transmitting terminal, to sending signal times to be called PN sign indicating number (Pseudo Noise Code: synchronous code pseudo noise code), the transmission signal of crossing as spread spectrum, and the signal crossed of this spread spectrum of wireless transmission.Then,, use the code that is used in the code synchronisation of spread spectrum with transmitting terminal, carry out the despreading of received signal and handle at receiving terminal.
Here, under the situation of radio telephone system, need a base station and a plurality of terminal identity to carry out radio communication simultaneously, each terminal identity is different with the position of base station, if do not carry out any Synchronous Processing, then sending to signal of base station from each terminal identity will be sent out with the timing of confusion, then can not carry out synchronization acquistion to each terminal identity that communicates in the base station.Therefore, in the base station of using the CDMA mode, set timing, and, catch the synchrodata that sends from this base station, communicate as benchmark with this timing of catching at each terminal identity as benchmark.
For example, in the radio telephone system that uses the CDMA mode, the synchronous code (PN sign indicating number) of the signal that sends from the base station is to manage by the absolute time that the system clock that the base station has is set.In addition, the data that send from the base station, comprise the data of this absolute time.In each terminal identity, according to being included in the absolute time data that receive in the data, revise the phase place of the synchronous code of this terminal identity use, and the anti-base station of issuing.
Yet,, need to set the system clock of absolute time in order to manage absolute time by the base station like this, and need be between base station and terminal identity the transmission time data, make the structure complicated of base station and terminal identity, simultaneously, service time, the control and treatment of data also became complicated.
The objective of the invention is to, the synchronization acquistion that makes it possible to carry out simply so that the CDMA mode is carried out under the radio communication situation is handled.
Wireless communications method of the present invention is the radio transmitting method that carries out two-way wireless communication between base station and a plurality of terminal identity, by the spread-spectrum signal of being crossed by the code spread of regulation, wherein, in the base station, produce code with predetermined timing, send cross by this code spread, as the signal of benchmark; In each terminal identity, receive from this signal of base station, regularly produce code synchronously with this reception, send the signal of the regulation of crossing by the code spread of this generation; In the base station, receive the signal that sends from this terminal identity, the code that will in the base station, produce and from received signal the timing error data between the detected code send to terminal identity.
According to this wireless communications method, each terminal identity can be revised according to the timing error data that send from the base station and send regularly, carries out synchronization acquistion well and handle between base station and terminal identity.
In addition, the radio communication device of first invention is the radio transmitting device that carries out two-way wireless communication between the terminal identity of itself and regulation, by the spread-spectrum signal of being crossed by the code spread of regulation, comprise: modulating unit is used for carrying out spread spectrum by the code of regulation to sending signal; Transmitting element is used for the transmission signal that wireless transmission was modulated by described modulating unit; Receiving element is used to receive the signal from the terminal identity wireless transmission of regulation; Demodulating unit is used for by the code of regulation the signal that receiving element receives being carried out despreading; Control unit is used to judge that modulating unit carries out the used code of spread spectrum and demodulating unit and carries out timing error between the used code of despreading, and the data that this judgement is obtained, as being included in the data that send in the signal.
According to this radio communication device, can send the required data of synchronization acquistion to terminal identity.
In addition, the radio communication device of second invention is between the base station of itself and regulation, carries out the radio transmitting device of two-way wireless communication by the spread-spectrum signal of being crossed by the code spread of regulation, and comprising: receiving element is used to receive the signal from the base station radio transmission; Demodulating unit is used for by the code of regulation the signal that receiving element receives being carried out despreading; Setup unit is used for that described demodulating unit carried out the used code of despreading and the generation timing error that sends between the spread-spectrum code of usefulness is set at predetermined timing; Modulating unit, the timing code that is used for being set by setup unit carries out spread spectrum to sending signal; Transmitting element is used for the transmission signal that wireless transmission was modulated by modulating unit.
According to this radio communication device, can be benchmark with the signal that sends from the base station, carry out the synchronization acquistion processing between its and this base station.
Brief description of drawings
Fig. 1 is the structure chart of the communication system example of one embodiment of the invention;
Fig. 2 is the block diagram of structure example of the base station of one embodiment of the invention;
Fig. 3 is the block diagram of structure example of the terminal identity of one embodiment of the invention;
Fig. 4 is the block diagram of the structure example of the Synchronous Processing in the terminal identity of one embodiment of the invention;
Fig. 5 is the block diagram of the structure example handled of the coherent detection in the base station of one embodiment of the invention;
Fig. 6 is the oscillogram of the coherent detection treatment state of one embodiment of the invention;
Fig. 7 is the flow chart of the Synchronous Processing state of one embodiment of the invention;
Fig. 8 is the functional-block diagram of the Synchronous Processing state of one embodiment of the invention.
Below, with reference to description of drawings one embodiment of the present of invention.
This example is applicable to the radio telephone system that carries out radio communication in the CDMA mode.At first, Fig. 1 illustrates the system configuration of this radio telephone system.In the case of this example, the terminal installation that communicates with the base station is made as the fixed terminal platform of fixed-site (promptly not moving), for example with the scope of the about ten number km in distance base station as service area.
The board 1 that is connected with general telegraph circuit is connected with a plurality of (being 3 here) base station 4a, 4b, 4c by base station controller 2.Transmission between this board 1 and each base station 4a, 4b, the 4c is carried out under the control that is connected to the communication control center 3 on the base station controller 2.On each base station 4a, 4b, 4c, be connected with antenna 5a, the 5b, the 5c that send and receive dual-purpose, carry out radio communication with fixed terminal platform in the service area that is arranged on each base station 4a, 4b, 4c.
Promptly, the structure of the first base station 4a is that the fixed terminal platform 12a～12n with the regulation number carries out radio communication, the structure of the second base station 4b is that the fixed terminal platform 22a～22n with the regulation number carries out radio communication, and the structure of the 3rd base station 4c is that the fixed terminal platform 32a～32n with the regulation number carries out radio communication.Here for the simplification of system, the maximum number that is connected to the fixed terminal platform on each base station 4a～4c is limited in less number (for example being approximately hundreds of), and the number of channel of setting simultaneously in a base station also is made as the less number of channel, is about 10 channels.
On each fixed terminal platform 12a～12n, 22a～22n, 32a～32n, be connected with antenna 11a～11n, the 21a～21n, the 31a～31n that carry out radio communication with the base station respectively.In addition, on each fixed terminal platform 12a～12n, 22a～22n, 32a～32n, be connected with telephone set 13a～13n, 23a～23n, 33a～33n.Each user uses this telephone set, its with intrasystem other telephone sets or and other telephone sets of being connected of general telegraph circuit between, converse or transfer of data.
Here, in this example,, between each base station 4a, 4b, 4c and fixed terminal platform 12a～12n, 22a～22n, 32a～32n, carry out two-way wireless communication by the CDMA mode of transmission spread-spectrum signal.Here, for example in any of downgoing line and uplink, in each base station, set 11 channels, and set the control channel (channel that is used to control as paging channel etc.) of a channel and the talk channel (Traffic Channel) of 10 channels.
Below, with reference to Fig. 2, the communication structure of each base station 4a, 4b, 4c is described.The structure of transmitting system at first is described, the channel number 101a of transmission data output end, the 101b identical, that prepare that prepare with base station ... on the .101n, provide the data of the downgoing line that never illustrated transmission data generative circuit sends by each channel.The transmission data of 11 channels that obtain at each terminal 101a～101n place are provided for modulation treatment with IC 102, and the data of each channel are carried out the modulation treatment that the CDMA mode is used respectively.(Field Programmable Gate Array: integrated circuit field programmable gate array) constitutes this modulation treatment by being called FPGA with IC 102.In modulation treatment with in the IC 102, be the transmission data preparation of each channel frequency mixer 103a, 103b .... in handle, the spread spectrum that code generating unit 104 is provided carries out mixing with code, and as spread-spectrum signal.
On code generating unit 104, be connected with memory (ROM) 105, for each channel, storage in advance sends handles required code data, code generating unit 104 is read and is stored in the spread spectrum code that each channel in this memory 105 is used, and offer frequency mixer 103a, 103b that corresponding channel uses .....
In this example, as the code data that each channel is used, will be channel code W with code (Walsh-Code) for the User Recognition of each channel setting analog value
i(t), with the synchronous code a that constitutes by the PN sign indicating number
0(t) multiply each other, with the data of gained (strictly speaking, be to two code fetch logic distance (Exclusive-OR) gained data) as the spread spectrum of each channel with code storage in memory 105.Here, synchronous code a
0(t) by length be the data formation of 512 chips (chip), channel code W
i(t) be that the data of 64 chips constitute by length, the spread spectrum code of the gained that multiplies each other is that length is the data of 512 chips, is stored in the memory 105.In addition, the synchronous code of 512 chips is also stored respectively with code with spread spectrum.Be stored in spread spectrum in the memory 105 with the code also despreading code when the demodulation process, the despreading that is read out code generating unit 104 also is provided for demodulation process usefulness IC 142 described later with code.In addition, the output spread spectrum is with the timing of code and synchronous code, by timing generating circuit 137 controls in code generating unit 104.In the case, spread spectrum being used the length of code and synchronous code is that 512 chips are handled as a frame.
In the transmission data that modulation treatment is used with each channel of code mixing with spread spectrum in IC 102, being synthesized in adder 106 is the signal G (t) of a system.Being synthesized in adder 106 is the signal G (t) of a system, offers quadrature modulator 108 by low pass filter 107 as I component.In addition, with the code generating unit 104 in the IC 102, will be stored in synchronous code in the memory 105 from modulation treatment as signal a
0(t) output is with this signal a
0(t) offer quadrature modulator 108 by low pass filter 109 as Q component.
In quadrature modulator 108, the modulation signal that provides according to local oscillator 110 carries out quadrature modulation with I component and Q component as the signal of 90 ° of phase differences, obtains the transmission signal that quadrature modulation is crossed.The transmission signal that the quadrature modulation of quadrature modulator 108 outputs is crossed, by buffer 111 and band pass filter 112, offer frequency translation is the frequency conversion frequency mixer 113 of transmission frequency, with the pairing frequency signal of transmission frequency of local oscillator 151 output, with send signal and carry out mixing, be transformed to transmission frequency.In frequency mixer 113, be transformed to the transmission signal of the frequency conversion of transmission frequency, be provided for antenna 119, carry out wireless transmission from antenna 119 by band pass filter 114, amplifier 115, power control amplifier 116, antenna multicoupler 118.Power control amplifier 116 is by control part 117 its outputs of control.
Below, the structure of the receiving system in the base station is described with reference to Fig. 2.The signal that antenna 119 receives is provided for low noise amplifier 120 by antenna multicoupler 118, and the received signal of amplifying in amplifier 120 is provided for frequency mixer 121.In frequency mixer 121, the frequency signal and the received signal of local oscillator 151 output are carried out mixing, be first intermediate-freuqncy signal with the received signal frequency conversion of allocated frequency band.
First intermediate-freuqncy signal of frequency conversion in frequency mixer 121 is provided for frequency mixer 124 by band pass filter 122, amplifier 123, and carries out mixing with the frequency signal of local oscillator 125 output, and frequency conversion is second intermediate-freuqncy signal.Here, frequency mixer 124 has automatic gain control amplifier (AGC amplifier), and the loop of this structure can be adjusted gain within the specific limits according to testing circuit 127 output levels that detect, frequency mixer 124.In addition, constitute a circuit, be used to detect the level of second intermediate-freuqncy signal of frequency mixer 124 outputs, detect level according to this, the control part of this base station (not shown) is judged the signal condition of each channel etc.Detect frequency mixer 124 outputs signal level structure as shown in Figure 5, its structure is with aftermentioned.
The structure of second intermediate-freuqncy signal of frequency mixer 124 output being carried out demodulation is, this second intermediate-freuqncy signal is offered quadrature demodulator 128 by amplifier 126, and the vibration output according to local oscillator 129 makes the I component of quadrature modulation separate with Q component.Isolated I component is provided for analog to digital converter 132 by low pass filter 130 and amplifier 131.Isolated Q component is provided for analog to digital converter 132 by low pass filter 133 and amplifier 134.
In analog to digital converter 132, the reference voltage that uses pedestal generator 135 to provide is transformed to numerical data with received signal.At this moment, the clock used of conversion uses the signal that timing generating circuit 137 provides.
The reception data of the reception data of the I component of conversion and Q component are provided for latch cicuit 136 in analog to digital converter 132, the timing signal that provides according to timing generating circuit 137 latchs, simultaneously, this latched data order according to the rules is taken into successively (being 11 here) preparation arranged side by side, identical with channel number memory 141a, 141b ... among the .141n.This is taken into control regularly and also sets according to the timing signal that timing generating circuit 137 provides.Provide timing signal from timing generating circuit 137 to each memory 141a～141n, undertaken by decoder 138.
Be taken into the data among memory 141a～141n that each channel uses, carry out data demodulates, and the I data of this each channel that demodulates and Q data are offered to separate call IC142 with the calculation process in the memory.Demodulation process is made of the integrated circuit that is called FPGA with IC 142,, carries out the demodulation process of the logical data of each letter with software processes here.The demodulation process of the signal that this demodulation process was for example modulated for BPSK.Demodulation process with the concrete processing of IC 142 is, to being taken into 1 data and the Q data among memory 141a～141n that each channel uses, multiply by the despreading code b that provides from code generator 104
k(n+mN).This despreading code b
k(n+mN) be with synchronous code a
0(t) and channel code W
i(t) the multiply each other code (strictly speaking, be to two code fetch logic distance (Exclusive-OR) gained data) of gained is stored in the memory 105.Despreading code b
k(n+mN) (n+mN) expression data number and the timing thereof shown in, k is a channel number.Owing to have 11 channels here, so k=0～10.For example, for demodulation first channel, the despreading code b that then uses first channel to use
1
Then, the I data and the Q data that multiply by the despreading code in demodulation process in IC 142 are carried out integral processing, signal and the undelayed signal that this integrated value is postponed gained specified time limit carried out multiplication, with this multiplication value as the detection value, from this detection value, receive the judgement of data, lead-out terminal 143a, the 143b that uses at each channel ... the reception data of each channel that the .143n place obtains judging.In addition,, also carry out same detection and handle, from this detection value, receive the judgement of data for the data that 1/2 periodic phase that is taken into I data among memory 141a～141n that each channel uses and Q data postponed.
Below, with reference to Fig. 3 illustrate such formation, carry out the communication structure of the fixed terminal platform of radio communication with the base station.The structure of the transmitting system of fixed terminal platform at first is described, never illustrated transmission data generative circuit provides the data of the uplink that sends to the base station to terminal 201.The transmission data that obtain at terminal 201 places are provided for and send with encoding section 202, send the modulation treatment of usefulness.At this moment, the clock synchronization of the assigned frequency that provides with signal generator 240 is carried out modulation treatment.
The transmission data of modulating with encoding section 202 in transmission are provided for frequency mixer 203, and multiply by the spread-spectrum code b that signal generator 240 provides
i(t), as spread-spectrum signal.This spread-spectrum code b
i(t) be the data that are stored in advance in the memory (ROM) 241 that is connected on the signal generator 240.This spread-spectrum code be with the memory 105 that is stored in the base station end in the identical data of code data, can carry out channel transmitted, prepare for each as the data that multiply by its channel code and PN sign indicating number.In addition, from memory 241, read spread-spectrum code, control by the data of set in register 242.To these register 242 set sense datas, carry out according to detected timing from receive data.This is read setting regularly and handles aftermentioned.
Then, will in frequency mixer 203, carry out the transmission data of spread processing, offer quadrature modulator 204, the synchronous code a that signal generator 240 is provided as Q component
0(t) offer quadrature modulator 204 as 1 component, the signal of crossing as quadrature modulation.The signal that quadrature modulation is crossed in quadrature modulator 204 is provided for frequency mixer 206 by variable delay circuit 205, carries out mixing with the vibration output of oscillator 207, as the transmission signal of predetermined band.Variable delay circuit 205 is under the control of the central control unit (CPU) at this terminal identity, set the circuit of retardation, and the details that the setting of retardation is handled is aftermentioned, handles by synchronization acquistion and sets retardation.
The output of frequency mixer 206 is provided for frequency mixer 211 by buffer 208, band pass filter 209, buffer 210.In this frequency mixer 211, carry out mixing with the vibration output of oscillator 212, and be converted to another frequency band, it is that the frequency conversion of transmission frequency is with frequency mixer 214 that the signal of this frequency conversion is offered frequency translation by band pass filter 213, with the frequency signal of the transmission frequency correspondence of local oscillator 236 output with send signal mixing, frequency conversion is a transmission frequency.Frequency conversion is that the transmission signal of transmission frequency is provided for antenna 220 by band pass filter 215, amplifier 216, power control amplifier 217, antenna multicoupler 219 in frequency mixer 214, carries out wireless transmission from antenna 220.Power control amplifier 217 is by control part 218 its outputs of control.
Below, the structure of the receiving system in the fixed terminal platform is described with reference to Fig. 3.The signal that antenna 220 receives is provided for low noise amplifier 221 by antenna multicoupler 219, and the received signal of amplifying in amplifier 221 is provided for frequency mixer 222.In frequency mixer 222, the frequency signal and the received signal of local oscillator 236 output are carried out mixing, be first intermediate-freuqncy signal with the received signal frequency conversion of predetermined band.
First intermediate-freuqncy signal of frequency conversion is provided for frequency mixer 225 by band pass filter 223, amplifier 224 in frequency mixer 222, and carries out mixing with the frequency signal of local oscillator 226 output, and frequency conversion is second intermediate-freuqncy signal.Here, frequency mixer 225 has automatic gain control amplifier (AGC amplifier), the output of frequency mixer 225 is offered testing circuit 228 by amplifier 227, and the loop of this structure can be according to the detection level of this testing circuit 228, modulation gain within the specific limits.
Second intermediate-freuqncy signal of frequency mixer 225 outputs is provided for the Circuits System of demodulate reception data by amplifier 229 and buffer 230 and detects the Circuits System of incoming level.The Circuits System that detects incoming level is with aftermentioned.In the Circuits System of demodulate reception data, the output of buffer 230 is offered frequency mixer 231, in frequency mixer 231 with despreading code b
i(t) and the frequency signal of regulation multiply each other, carry out that despreading is handled and it is transformed to the conversion process of baseband signal.The despreading code b that in this frequency mixer 231, is taken advantage of
i(t) being the signal of signal generator 240 output, is the spread-spectrum code b when sending processing
i(t) identical data.The despreading code b of signal generator 240 outputs
i(t) be provided for adder 243, and with the frequency signal addition of PLL circuit (phase-locked loop circuit) 257 output, this additive signal is provided for frequency mixer 231 by band pass filter 244, is mixed down second intermediate-freuqncy signal.
The received signal of despreading in frequency mixer 231, after in integrating circuit 232, being integrated, be provided for decision circuit 233, carrying out the detection of BPSK modulation signal handles, the signal of this detection is sampled in sample circuit and becomes numerical data, and this numerical data (reception data) can obtain at lead-out terminal 235 places.
In addition, in this routine receiving system, be provided with the structure of the incoming level that detects second intermediate-freuqncy signal.Fig. 4 illustrates the details of the structure of this detection incoming level, and the second intermediate-freuqncy signal S (t) that provides from buffer 230 is provided for 3 frequency mixers 251,261,266.The synchronous code a that provides the PN sign indicating number that provides from signal generator 240 to constitute to frequency mixer 251
0(t), and with received signal S (t) multiply each other.In frequency mixer 261,266, the synchronous code that provides from signal generator 240 also is provided, but the synchronous code a that in frequency mixer 261, is taken advantage of
0(t-α) is than synchronous code a
0(t) postpone 1/2 spreading rate phase place, and the synchronous code a0 that is taken advantage of (t+ α) is than synchronous code a in frequency mixer 266
0(t) leading 1/2 spreading rate phase place.
In frequency mixer 251, multiply by synchronous code a
0(t) signal is provided for envelope detection circuit 254 by band pass filter 252 and amplifier 253, carry out envelope detection, this detection value as after the value that compares with reference voltage, is offered the control terminal of voltage controlled oscillator 270 in operational amplifier 255.The output voltage of operational amplifier 255 for example shown in the A of Fig. 6, with the reception data sync time, is the highest state of level (1V), when departing from this state, then detects level and reduces.In addition, the output of amplifier 253 is provided for PLL circuit 257, will offer adder 243 by phase-adjusting circuit 256 based on the frequency signal of the oscillatory regime of the output voltage of amplifier 253.In overall structure shown in Figure 3, in phase-adjusting circuit 256, carry out being provided for PLL circuit 257 after the phase place adjustment, and in structure shown in Figure 4, in phase-adjusting circuit 256 output of PLL circuit 257 is adjusted, these two kinds of structures can.
In frequency mixer 261, multiply by the signal of synchronous code a0 (t-α), be provided for envelope detection circuit 264, carry out envelope detection by band pass filter 262 and amplifier 263, with this detection value offer operational amplifier 265-input.In frequency mixer 266, multiply by the signal of synchronous code a0 (t+ α), be provided for envelope detection circuit 269, carry out envelope detection by band pass filter 267 and amplifier 268, with this detection value offer operational amplifier 265+input.In operational amplifier 265, it is poor that the two detection values that provide are got, and this difference signal offered the control terminal of voltage controlled oscillator 270.The output voltage of operational amplifier 265 for example shown in the B of Fig. 6, is being 0V when receiving data sync, when departing from this synchronous regime, and voltage up-down then, the S-shaped curve characteristic of its voltage characteristic.
Voltage controlled oscillator 270 is controlled frequency of oscillation according to the output of operational amplifier 255 and 265, and this output frequency signal is offered signal generator 240 and register 242 by frequency divider 271.
As shown in Figure 4, the central control unit 261 of this terminal identity is used to control the retardation of the variable delay circuit 205 of transmitting system, in the memory (not shown) of the storage of this retardation in central control unit 261.In addition, Fig. 4 even illustrate, encoding section 202 is connected on the telephone set 263 that is connected with this terminal identity by interface portion 262 with sample circuit 234.
Below, with reference to Fig. 5 the structure base station end, that detect the incoming level of receive channel is described.The structure that structure that this base station end detects and terminal you detect is basic identical.That is, circuit shown in Figure 5 is the circuit that detects incoming level from second intermediate-freuqncy signal that receives (output of the frequency mixer 124 of Fig. 1), and this second intermediate-freuqncy signal is offered 3 frequency mixers 151,161,166.The synchronous code a that reads from memory 105 is provided to frequency mixer 151
0(t), and with received signal multiply each other.In frequency mixer 161,166, also multiply by synchronous code, still, the synchronous code a that in frequency mixer 161, is taken advantage of
0(t-α) is than synchronous code a
0(t) postpone 1/2 spreading rate phase place, and the synchronous code a that in frequency mixer 166, is taken advantage of
0(t+ α) is than synchronous code a
0(t) leading 1/2 spreading rate phase place.
In frequency mixer 151, multiply by synchronous code a
0(t) signal, be provided for envelope detection circuit 154 by band pass filter 152 and amplifier 153, carry out envelope detection, with this detection value as after the value that in operational amplifier 155, compares with reference voltage, offer analog to digital converter 156, become numerical data.The output voltage of operational amplifier 155 for example shown in the A of Fig. 6, with the reception data sync time, is the highest state of level (1V), when departing from this state, then detects level and reduces.
In frequency mixer 161, multiply by synchronous code a
0The signal of (t-α) is provided for envelope detection circuit 164 by band pass filter 162 and amplifier 163, carries out envelope detection, with this detection value offer operational amplifier 165-input.In frequency mixer 166, multiply by the signal of synchronous code a0 (t+ α), be provided for envelope detection circuit 169, carry out envelope detection by band pass filter 167 and amplifier 168, with this detection value offer operational amplifier 165+input.In operational amplifier 165, it is poor that the two detection values that provide are got, and this difference signal is offered decision circuit 170.The output voltage of operational amplifier 165 for example shown in the B of Fig. 6, is being 0V when receiving data sync, when departing from this state, and voltage up-down then, the S-shaped curve characteristic of its voltage characteristic.Then, in decision circuit 170, judge this magnitude of voltage, judge whether it is synchronous regime.
Original sigmoid curve characteristic is the characteristic shown in the B of Fig. 6, but is the processing in the operational amplifier 165 here, and magnitude of voltage is set at some in 0V and two values of 1V.Therefore, the position of zero passage and outside the sigmoid curve scope in sigmoid curve, magnitude of voltage is 0V, and beyond the position of the zero passage in sigmoid curve, magnitude of voltage is 1V.Then, in decision circuit 170, judge that magnitude of voltage is 0V or 1V, judge whether it is synchronous regime.
Below, handle with reference to the synchronization acquistion this example of flowchart text, when between base station and fixed terminal platform, carrying out radio communication of Fig. 7.In the flow chart of Fig. 7, the step S11 in left side～S16 illustrates the processing in the base station, and the step S21 on right side～S31 illustrates the processing in the terminal identity.At first, in base station and terminal identity, all carry out initialization process (step S11, S21), beginning transmit operation and reception operation (step S12, S22) in base station and terminal identity.At this moment, send synchronous code a from the base station with Q component
0(t).In terminal identity, catch this synchronous code a
0(t) (step S23) handled in synchronization acquistion.Then, use receive the synchronous code of using this moment, send processing (step S24) to the base station from terminal identity.In the base station, carry out this moment from the reception processing (step S13) of the signal of terminal identity transmission.
In the base station, also carry out synchronization acquistion processing from the signal of terminal identity, with the dateout (incoming level data) of the analog to digital converter 156 of incoming level detection circuitry shown in Figure 6 and the result of determination data of decision circuit 170, be included in the data that terminal identity sends (step S14).In terminal identity, receive the signal that sends from the base station, the incoming level data that comprise in this received signal are deciphered (step S25).Here, with the incoming level of this decoding, judge that whether synchronous error is at 1/2 (step S25) below the spreading rate.Here, the dateout of analog to digital converter 156 as shown in Figure 6, more than the magnitude of voltage of regulation when (being more than the 0.5V), is judged as synchronous error at 1/2 below the spreading rate here.By this judgement, be judged as synchronous error not when 1/2 spreading rate is following, under the control of the central control unit 261 (with reference to Fig. 4) in terminal identity, make the retardation of the variable delay circuit 205 of transmitting system change 1/2 spreading rate (step S27), repeat the operation of catching among the step S14 under the state of this variation, the base station.The phase change of 1/2 spreading rate in this terminal identity is equivalent to the coarse adjustment that synchronization acquistion is handled.
Then, the coarse adjustment of the phase change by this 1/2 spreading rate, judge that in the step S26 of terminal identity synchronous error is whether when 1/2 spreading rate is following, in the central control unit of terminal identity, the incoming level data of the analog to digital converter 156 that sends and the result of determination data of decision circuit 170 are checked (step S28) from the step S15 of base station this moment.The inspection of this moment is result of determination data (DIFF data) of checking decision circuit 170.Check the state that judges whether from the center that reaches S shape, be that decision content is the state (step S29) of 1 state variation to 0 with this.
Here, change to 0 o'clock less than decision content from 1 in detection, under the control of the central control unit 261 in terminal identity, make the retardation of the variable delay circuit 205 of transmitting system change 1/4 spreading rate (step S30), repeat the operation of catching among the step S15 under the state of this variation, the base station.The phase change of 1/4 spreading rate in this terminal identity is equivalent to the fine setting that synchronization acquistion is handled.
Then, the coarse adjustment of the phase change by this 1/4 spreading rate, when in the step S29 of terminal identity, detecting the state from 1 state variation to 0, the synchronization acquistion of finishing in the terminal identity is handled, and the retardation (being actually the data Tst1 of the number of times of revising) that set this moment in variable delay circuit 205 is stored in (step S31) in the memory in the central control unit 261.In addition, also detect same state, finish synchronization acquistion and handle, with in the memory of storage in the base station of retardation (correction number of times) at this moment (step S16) at the base station end.
Synchronization acquistion shown in the flow chart of this Fig. 7 is handled, in this routine radio telephone system, carry out when being the initial setting when the fixed terminal platform being provided with to each user, when in this fixed terminal platform, communicating later on the base station, according to the data of the retardation in the memory that is stored in the central control unit (correction number of times), set the processing of retardation of the variable delay circuit 205 of transmitting system.
Synchronization acquistion shown in this flow chart processing is represented with functional-block diagram, then is state shown in Figure 8.In Fig. 8,300 is the base station, and 400 is the fixed terminal platform.In base station 300, the synchronous code a that constitutes by the PN sign indicating number
0(t) in PN code generator 301, produce, and send as Q component.Here, receive this synchronous code a at terminal identity
0(t) time, as producing τ
DownThe synchronous code a that shown downgoing line transmission line postpones
0(t-τ
Down) receive.In terminal identity 400, receive this synchronous code a with synchronous circuit 401
0(t-τ
Down), in synchronous code generator 402, produce the synchronous code a consistent with the timing of this detected synchronous code
0(t-τ
Down).
The synchronous code a that in the fixed terminal platform, produces
0(t-τ
Down) be provided for the variable delay circuit 403 of transmitting system, by this delay circuit 403 additional τ
StThe synchronous code a that shown retardation obtains
0(t-τ
Down-τ
St), be sent to the base station as the Q component that sends signal.
The signal that sends from fixed terminal platform 400 is received by base station 300.Here, receive this synchronous code a in the base station
0(t-τ
Down-τ
St) time, receive and produce τ
UpThe synchronous code a of shown uplink transmission wire delay
0(t-τ
Down-τ
St-τ
Up).In the synchronous circuit 302 of base station 300, at this synchronous code a that receives
0(t-τ
Down-τ
St-τ
Up) and the synchronous code a that produces of PN code generator 301
0(t) under the dephased situation, detect synchronous error between.
That is, the repetition period of establishing the PN sign indicating number is T, n when being integer value, the retardation τ in the setting terminal platform
St, make and to satisfy the condition shown in the following formula (specifically, be make synchronous) with the integral multiple of repetition period of PN sign indicating number.
a
0(t-n×T)＝a
0(t-τ
down-τ
st-τ
up)
Here, only illustrated that the synchronization acquistion in the terminal identity is handled, in intrasystem each terminal identity of this example, carried out same synchronization acquistion respectively and handle.
Handle by between base station and fixed terminal platform, carrying out synchronization acquistion like this, in each fixed terminal platform, with the relevant data of synchronous regime that send with the base station, adjust the phase place that sends signal, until being judged as the synchronization acquistion state that reaches, even without benchmark timing informations such as system clock data, also can carry out synchronization acquistion to signal and handle with CDMA mode spread spectrum and transmission.In addition, in above-mentioned synchronization acquistion is handled, after the coarse adjustment of carrying out 1/2 spreading rate of phase deviation, carry out the fine setting of 1/4 spreading rate of phase deviation, therefore, can carry out synchronization acquistion rapidly and handle.
In addition, because the terminal identity of preparing in this routine system is the fixed terminal platform, so the transmission of status of itself and base station often keeps certain possibility very big, in the initial setting when the fixed terminal platform is set, carry out this synchronization acquistion and handle, storage retardation at this moment, set this retardation when communicating by letter afterwards, can when itself and base station communication, directly carry out synchronization acquistion and handle, the Synchronous Processing in the time of can promptly communicating beginning.
In the above description, this routine synchronization acquistion is handled and is used in base station that radio telephone system uses and the wireless communication process between the terminal identity, and still, the synchronization acquistion that it also can be used in other various wireless communication systems that adopt the CDMA mode is handled.In addition, in the above description, terminal identity is the fixed terminal platform of fixed-site, still, also can be the portable terminal platform.
The wireless communications method of the 1st aspect according to the present invention, each terminal identity can be according to sending from the base station The timing error data are revised and are sent timing, carry out synchronization acquistions place well between base station and terminal identity Reason.
The wireless communications method of the 2nd aspect according to the present invention, in the invention aspect the present invention the 1st, root According to from the base station to the timing error data of terminal identity transmission, in terminal identity, set and make generation spread spectrum code The amount that is offset of timing, thereby the signal that sends to the base station becomes the synchronous timing of all terminal identities, Communication when can carry out well between base station and a plurality of terminal identity.
The wireless communications method of the 3rd aspect according to the present invention, in the invention aspect the present invention the 2nd, Carry out coarse adjustment in the terminal identity, until detected timing error amount reaches the phase mass of regulation, by S shape Curve characteristic is carried out trim process, until reach the phase mass of regulation, thus can promptly carry out terminal Synchronization acquistion in the platform is processed.
The wireless communications method of the 4th aspect according to the present invention is in the invention aspect the present invention the 2nd, eventually The amount that the storage of end platform is offset the timing of generation code since next time, is advanced at terminal identity and base station Row is during radio communication, makes the timing offset that produces code equal the side-play amount of this storage, thereby to base Carried out after the synchronization acquistion at the station, and the data of storing during according to this synchronization acquistion can in terminal identity Process promptly to carry out synchronization acquistion.
The wireless communications method of the 5th aspect according to the present invention, the wireless transmission side aspect the present invention the 2nd In the method, each terminal identity is the fixing fixed terminal platform of setting position, thus this fixed terminal platform can be often with Identical state communicates, so only need later the setting of this side-play amount, can carry out synchronously the base station Catch processing.
The radio transmitting device of the 6th aspect according to the present invention can send terminal identity is carried out synchronization acquistion Required data so the complex control that need not use system clock etc. to carry out is processed, can be advanced simply The Synchronization Control of row terminal identity.
The radio transmitting device of the 7th aspect according to the present invention, the signal that will send from the base station be as benchmark, The synchronization acquistion that can carry out between itself and this base station is processed, and carries out well synchronization acquistion and processes.
The radio transmitting device of the 8th aspect according to the present invention, in the invention aspect the present invention the 7th,, set the timing error in the setup unit according to the data that are included in the received signal that modulating unit modulated, thereby can use data, carry out synchronization acquistion well from base station transmits.
The radio transmitting device of the 9th aspect according to the present invention, in the invention aspect the present invention the 8th, comprise memory cell, be used for storing according to being included in the data of the received signal of demodulating unit demodulation, the timing error of in setup unit, setting, when in memory cell, storing the timing error data, set timing difference in the setup unit according to these storage data, thereby only need read the storage data of memory cell and be set in the setup unit, the synchronization acquistion that can promptly carry out between itself and the base station is handled.
Claims (7)
1, a kind of radio transmitting method between base station and a plurality of terminal identity, carries out two-way wireless communication by the spread-spectrum signal of being crossed by the code spread of regulation, wherein,
In the base station, produce described code with predetermined timing, send cross by this code spread, as the signal of benchmark;
In each terminal identity, receive from this signal of base station, regularly produce described code synchronously with this reception, send the signal of the regulation of crossing by the code spread of this generation;
In the base station, receive the signal that sends from this terminal identity, the described code that will in the base station, produce and from received signal the timing error data between the detected code send to terminal identity;
According to the timing error data from the base station transmits to the terminal identity, in terminal identity, the amount that setting is offset the timing of the described code of generation;
The amount that the terminal identity storage is offset the timing of the described code of generation;
Since next time, when radio communication is carried out in terminal identity and base station, make the side-play amount of the timing that produces described code equal the side-play amount of this storage.
2, radio transmitting method as claimed in claim 1, wherein,
In terminal identity, carry out coarse adjustment and handle, until the phase change of detected timing error amount for regulation;
Carry out trim process according to voltage response, until the phase change that reaches described regulation.
3, radio transmitting method as claimed in claim 1, wherein,
Each terminal identity is the fixed terminal platform that fixed-site is set.
4, a kind of radio transmitting device between the terminal identity of itself and regulation, carries out two-way wireless communication by the spread-spectrum signal of being crossed by the code spread of regulation, and this radio transmitting device comprises:
Modulating unit is used for carrying out spread spectrum by described code to sending signal;
Transmitting element is used for the transmission signal that wireless transmission was modulated by described modulating unit;
Receiving element is used to receive the signal from the terminal identity wireless transmission of described regulation;
Demodulating unit is used for by described code the signal that described receiving element receives being carried out despreading;
Control unit is used to judge that described modulating unit carries out the used code of spread spectrum and described demodulating unit and carries out timing error between the used code of despreading, and the data that this judgement is obtained are as the data that are included in the described transmission signal.
5, a kind of radio transmitting device between the base station of itself and regulation, carries out two-way wireless communication by the spread-spectrum signal of being crossed by the code spread of regulation, and this radio transmitting device comprises:
Receiving element is used to receive the signal from described base station radio transmission;
Demodulating unit is used for by described code the signal that described receiving element receives being carried out despreading;
Setup unit is used to set the timing that described demodulating unit carries out the used code of despreading and sends the generation timing error between the spread-spectrum code of usefulness;
Modulating unit, the timing code that is used for being set by described setup unit carries out spread spectrum to sending signal;
Transmitting element is used for the transmission signal that wireless transmission was modulated by described modulating unit.
6, radio transmitting device as claimed in claim 5, wherein,
According to the received signal of described demodulating unit demodulation, set the timing error in the described setup unit.
7, radio transmitting device as claimed in claim 6, wherein,
Comprise memory cell, be used for storing the timing error of setting at described setup unit according to the received signal of described demodulating unit demodulation;
When in described memory cell, storing the timing error data,, set the timing error in the described setup unit according to these storage data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99103849 CN1114327C (en) | 1999-03-15 | 1999-03-15 | Wireless transmission method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99103849 CN1114327C (en) | 1999-03-15 | 1999-03-15 | Wireless transmission method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1267175A CN1267175A (en) | 2000-09-20 |
| CN1114327C true CN1114327C (en) | 2003-07-09 |
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ID=5271480
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99103849 Expired - Fee Related CN1114327C (en) | 1999-03-15 | 1999-03-15 | Wireless transmission method and device |
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|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2481579B (en) * | 2010-06-25 | 2014-11-26 | Enmodus Ltd | Monitoring of power-consumption |
| US9276810B2 (en) * | 2011-12-16 | 2016-03-01 | Futurewei Technologies, Inc. | System and method of radio bearer management for multiple point transmission |
| CN109088545B (en) * | 2018-06-19 | 2019-09-13 | 华中科技大学 | A kind of phase synchronization method of bidirectional radio energy Transmission system |
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1999
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|---|---|
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