CN101262287A

CN101262287A - Cluster pulse signal energy synchronization detection method in pulse ultra-broadband communication system

Info

Publication number: CN101262287A
Application number: CNA200810073545XA
Authority: CN
Inventors: 王玫; 郑光永; 郑霖
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2008-04-19
Filing date: 2008-04-19
Publication date: 2008-09-10
Anticipated expiration: 2028-04-19
Also published as: CN101262287B

Abstract

The invention provides a synchronized detecting method for cluster pulse signal energy in a pulse ultra wide band (UWB) communication system. The technical proposal of the invention is mainly that: the analog phase locked loop technology is utilized to reconstructing a phase locked loop feedback branch; a loop voltage controlled oscillator (VCO) is output and transformed into a square-wave pulse, the chroneme of which is controlled, and the square-wave pulse is multiplied by the cluster pulse signals that are input; on one hand, the phase demodulation function of the loop is performed, and the chroneme of the square-wave pulse that has a certain time window width is aligned with the cluster pulse through the loop, and chroneme synchronizing is obtained through loop locking; on the other hand, the cluster pulse is integrated in the time window, so as to complete efficient energy detection. The synchronized detecting method has the advantages that the non-correlation synchronized detection method, by analog capturing and tracking of the clock and the phase of the pulse signals, realizes signal energy detection in a channel associated way, and the method also can effectively resist the impact of clock drift on the detection; besides, the method is simple, reliable, low-cost and free of cost for signal channels.

Description

Bunch pulse signal energy synchronization detection method in the pulse ultra-broadband communication system

Technical field:

The present invention relates to the energy measuring of bunch pulse signal in the pulse ultra-broad band communication control processor, particularly control, detect the method for bunch pulse signal energy by time bit synchronization to the energy integral window.

Background technology:

Pulse ultra-broad band (IR-UWB) communication/navigation system has low-complexity, low-power consumption and technical advantage cheaply.More and more be subject to people's attention and study, in radio sensing network and cognitive radio technology, will play an important role.

Because it is periodicity ns level burst pulse that the IR-UWB signal transmits the carrier of information, through the wireless channel transmission, multipath effect can make the sighting distance ripple (LOS) and the synthetic received signal waveform of various non line of sight ripples (NLOS) present a bunch pulse shape, it is a waveform that is similar to quenching frequency oscillation, rising edge (forward position) and trailing edge are arranged, and maximum occurs in middle front part.The common technology that detects this bunch of pulse signal in the receiver has two kinds, a kind of is coherent detection, receiver this locality will provide one and the identical template signal of received signal, received signal suffers effects such as multipath and noise with the emission deterministic signal a great difference to be arranged fully, and therefore the technical difficulty that realizes is big; Another kind is to adopt energy measuring, this locality provides a square-wave signal that the certain hour width is arranged, and multiplies each other with an input bunch pulse signal, and integration is obtained signal energy and detected output, technical difficulty with respect to coherent detection is little, becomes the common method of IR-UWB input.

No matter adopt coherent detection or energy measuring, the IR-UWB receiver requires all very high to synchronous accuracy.The synchronously general algorithm of integration, sampling and numeral search that adopts of IR-UWB receiver realizes that for example sliding window search, binary search and maximum likelihood searching etc. need the sampling of two-forty, and resolution also is difficult to the accuracy that reaches high; The another one problem is that pulse or bunch pulse duration are all extremely narrow among the IR-UWB, and the slight drift of send-receive clock all can bring the bigger error of synchronous detecting.Frequent insert synchronous training and also increased channel overhead, and synchronous losing lock takes place easily, catch with lock in time long, the circuit complexity.The present invention seeks the irrelevant synchronization detecting method of a kind of simple and reliable, low cost and low-power consumption, by analog capture and direct trace pulse signal clock of tracking and phase place, and, can effectively resist the negative effect that clock drift brings detection, and not have channel overhead with road realization input.

Summary of the invention:

The objective of the invention is to by to the energy integral window the time bit synchronization control and window size effective adjusting, bunch pulse signal energy synchronization detecting method and device thereof in a kind of simple and reliable pulse ultra-broadband communication system cheaply is provided.

Purpose of the present invention realizes by following technical proposals:

Technical scheme of the present invention is to have utilized the analog phase-locked look technical know-how, the phase-locked loop feedback branch is transformed, the controlled square-wave pulse in position when circulation circuit voltage-controlled oscillator (VCO) output transform is one, allow it and a bunch pulse signal of importing multiply each other, carry out the phase discrimination function of loop on the one hand, bit synchronization when obtaining by loop-locking is alignd in the position when making the square-wave pulse of certain hour window width by loop with a bunch pulse.On the other hand in this time window to a bunch pulse integration, finish effective energy measuring.This method comprises following sequential steps:

Allow the discrete bunch pulse signal of UWB receiver input improve bunch impulse level earlier through low noise ultra broadband amplifier (LNA), irrelevant testing circuit through joining with LNA again, as squaring circuit, two-way bunch of pulse become unidirectional bunch of pulse signal, above-mentioned unidirectional bunch of pulse signal sent into analog phase-locked look (APLL) the main body circuit that joins with squaring circuit, the phase-locked loop feedback branch circuit that is attached thereto is sent in the output of the voltage controlled oscillator of main body circuit (VCO), send into the simulation phase discriminator that is connected with the feedback branch end again, allow it and a bunch pulse signal of importing multiply each other, subtract the output of phase device through simulation then, through integrator and decision device circuit, can obtain data synchronization and detect output.

Realize the device of above-mentioned pulsation bunch pulse signal energy measuring method in the ultra-wideband communication system, comprise low-noise wide-band amplifier (LNA), squaring circuit, simulation phase discriminator, the integrator, the decision device circuit that are connected with the simulation phase discriminator, it is characterized in that also being provided with the simulaed phase locked loop that is linked in sequence by simulation phase discriminator, loop filter and voltage controlled oscillator and by forward and reverse phase-locked loop feedback branch that is linked in sequence and forms along circuits for triggering and square-wave pulse generation circuit, pi/2 phase shift circuit, the positive and negative circuits for triggering that hand down are connected with level control circuit.

Described simulaed phase locked loop main body is linked in sequence with analog vco (VCO) circuit by simulation phase discriminator (analogue multiplier), loop filter (LF) and forms.

Described phase-locked loop feedback branch is produced circuit and pi/2 phase shift circuit along circuits for triggering and square-wave pulse and is linked in sequence and forms by forward and reverse.

Described forward and reversely be connected with level control circuit, be used for the time window width of controlling party wave impulse along circuits for triggering.

According to the analog phase-locked look theory: when APLL entered locking, the periodic frame of VCO output sinusoidal wave forward maximum at interval had 90 ° of phase shifts with a bunch pulse, thus in the loop feedback branch road earlier with the VCO sine wave output.Trigger with the forward rising, oppositely the decline circuits for triggering are transformed to forward square-wave pulse in the frame period, import analogue multiplier through 90 ° of phase-shift circuits as the square-wave pulse that the certain hour window width is arranged again, wherein triggering level can be set according to channel status, thus the time window width of controlling party wave impulse.This improvement project has been utilized the analog phase-locked look technology, has realized that fairly simplely the energy of bunch pulse extracts synchronously, then with analogue multiplier output process integrator and decision device, can obtain data synchronization and detect output.

Advantage of the present invention is:

This irrelevant synchronization detecting method realizes that with the road signal energy detects, and can effectively resist the influence of clock drift to detecting that method itself is simple and reliable, and is with low cost, and do not have channel overhead by the clock and the phase place of analog capture and trace pulse signal.

Description of drawings:

Fig. 1 connects block diagram for each functional module of detection method of the present invention;

The frame pulse structural representation that Fig. 2 sends and receives for the present invention.

Embodiment:

The energy detection method of bunch pulse signal in the IR-UWB communication control processor of the present invention, it is controlled by the time bit synchronization to the energy integral window, and effective adjusting of window size, can obtain maximum energy output, with reference to Fig. 1 detection method is bunch pulse signal process LNA and the squaring circuit that allows the UWB receiver import earlier, and squaring circuit can be the simulation phase discriminator that unidirectional bunch pulse enhancing signal energy is sent into simulaed phase locked loop then with two-way bunch of impulse transfer.

What carry information at IR-UWB signal He is the frame pulse of OOK (amplitude switch keying) or PPM (pulse position modulation) modulation, the channel transmission, and the receiver input then is a frame bunch impulse form.Main body A PLL implements the energy synchronous detecting of bunch pulse by the locking of frame clock signal.For ease of synchronous and detection, IR-UWB data transmission structure and signal frame structure can directly be extracted clock information in the transfer of data as shown in Figure 2 usually; Change at random is disturbed because of suffering multipath in the time position of bunch pulse in the signal frame structure, and it is the synchronized control object of local zone time window square wave.

According to the analog phase-locked look theory, when APLL enters when locking, the periodic frame of VCO output sinusoidal wave forward maximum at interval has 90 ° of phase shifts with a bunch pulse, thus in the loop feedback branch road earlier with the VCO sine wave output.Trigger with the forward rising, oppositely the decline circuits for triggering are transformed to forward square-wave pulse in the frame period, the square-wave pulse input analogue multiplier that the certain hour window width is arranged through 90 ° of phase-shift circuit effects again, wherein triggering level can be set according to channel status, thus the time window width of controlling party wave impulse.This improvement project has been utilized the analog phase-locked look technology.Fairly simple realization the energy of bunch pulse extract synchronously, then with analogue multiplier output through integration and decision device, can obtain data synchronization and detect output.

OOK modulation system with the binary data transmission is an example below, in conjunction with the accompanying drawings the inventive method is further described:

Adopting foregoing circuit is that 100MHz, employing envelope are 4ns to frame frequency, the RF pulse signal of centre frequency 3.5GHz, and modulator approach is OOK (amplitude switch keying) mode, promptly symbol " 1 " is the radio-frequency pulse of ns level to ns level burst pulse or envelope should be arranged; Symbol " 0 " no pulse exists.Implement the energy synchronous detecting in the receiver.Receiver input for the time position bunch pulse that has uncertainty to be offset.After the preposition amplification of low noise, allow a bunch impulse level reach more than the 10mV, the effect of square law device can promote frame frequency component in bunch pulse, helps the synchronous extraction of APLL to frame clock signal.Utilize the weak signal of analog phase-locked look to extract and detectability, application drawing 1 improved APLL structure can make the VCO fast frequency locking on the frame frequency of discrete bunch pulse.The APLL that enters locking has the synchronous maintenance function of certain hour, can allow data subsequently implement aforesaid energy synchronous detecting.The frame structure of transfer of data has 1024 data, generally can finish synchronously in 20 to 80 pulse frames intervals, and also the lock in time that promptly enters locking, time to lose lock can be more than 10us between 0.02us to 0.08us.Therefore, realize more effectively discrete bunch pulse the energy synchronous detecting, demodulate data.

Claims

1, bunch pulse signal energy synchronization detection method in a kind of pulse ultra-broadband communication system comprises the step of following order:

(1) discrete bunch of a pulse signal process low noise ultra broadband amplifier (LNA) and an irrelevant testing circuit that is connected with low noise ultra broadband amplifier (LNA) that allows the IR-UWB receiver import earlier obtains unidirectional bunch of pulse signal;

(2) above-mentioned unidirectional bunch of pulse signal sent into the simulaed phase locked loop that joins with irrelevant testing circuit,, send into the analog phase-locked look feedback branch of the simulaed phase locked loop that is attached thereto by the output of the voltage controlled oscillator in the main body circuit of this simulaed phase locked loop;

(3) send into the simulation phase discriminator that is connected with the end, road of phase-locked loop feedback, allow it and a bunch pulse signal of importing multiply each other;

(4) and then through the simulation phase discriminator export, promptly obtain data synchronization detection output through integrator and decision device.

2, detection method according to claim 1 is characterized in that: described irrelevant testing circuit is a squaring circuit.

3, detection method according to claim 1 is characterized in that: the described simulaed phase locked loop main body of step 2 circuit is linked in sequence by simulation phase discriminator, loop filter and voltage controlled oscillator and forms.

4, detection method according to claim 1 is characterized in that: the described phase-locked loop feedback branch of step 2 is produced circuit and pi/2 phase shift circuit along circuits for triggering and square-wave pulse and is linked in sequence and forms by forward and reverse.

5, according to claim 1 or 3 described detection methods, it is characterized in that: described forward and reversely be connected with level control circuit along circuits for triggering.