CN101262287B

CN101262287B - Cluster pulse signal energy synchronization detection method in pulse ultra-broadband communication system

Info

Publication number: CN101262287B
Application number: CN200810073545XA
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: 2012-05-23
Anticipated expiration: 2028-04-19
Also published as: CN101262287A

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 through 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 receive people's attention and research, 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 reception 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, and 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 reception signal; Receive signal and suffer effects such as multipath and noise with the emission deterministic signal a great difference to be arranged fully, the technical difficulty that therefore 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, complicated circuit.The present invention seeks the irrelevant synchronization detecting method of a kind of simple and reliable, low cost and low-power consumption; Through 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 through 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.

The object of the invention is realized through 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 lets it and a bunch pulse signal of importing multiply each other, and carries out the phase discrimination function of loop on the one hand; Bit synchronization when obtaining through loop-locking is alignd in the position when making the square-wave pulse of certain hour window width through loop with a bunch pulse.On the other hand in this time window to a bunch pulse integration, accomplish effective energy measuring.This method comprises following sequential steps:

Let the discrete bunch pulse signal of UWB receiver input improve bunch impulse level earlier through low noise ultra broadband amplifier (LNA); The irrelevant testing circuit that joins of warp and LNA again; Like 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, let 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 synchronization of data 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 connects to form along circuits for triggering and square-wave pulse generation circuit, pi/2 phase shift CO circuit order, the positive and negative circuits for triggering that hand down are connected with level control circuit.

Described simulaed phase locked loop main body is formed by connecting with analog vco (VCO) CO circuit order simulation phase discriminator (analogue multiplier), loop filter (LF).

Described phase-locked loop feedback branch produces circuit and the pi/2 phase shift CO circuit order is formed by connecting forward and reverse along circuits for triggering and square-wave pulse.

Described forward and reversely be connected with level control circuit, be used to control the time window width of square-wave pulse along circuits for triggering.

Theoretical according to analog phase-locked look: when APLL got into 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; Reverse 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 control square-wave pulse.This improvement project has been utilized the analog phase-locked look technology, has realized the energy simultaneous extraction of bunch pulse fairly simplely, then with analogue multiplier output process integrator and decision device, can obtain synchronization of data 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 through 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 through the time bit synchronization to the energy integral window; And effective adjusting of window size; Can obtain maximum energy output, be bunch pulse signal process LNA and the squaring circuit that lets the UWB receiver import earlier with reference to Fig. 1 detection method, 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 to 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 through the locking of frame clock signal.For ease of synchronous and detection, IR-UWB data transmission structure and signal frame structure are as shown in Figure 2 usually, can directly extract clock information in the transfer of data; 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.

Theoretical according to analog phase-locked look, when APLL got into 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; Reverse 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 control square-wave pulse.This improvement project has been utilized the analog phase-locked look technology.Fairly simple realization the energy simultaneous extraction of bunch pulse, then with analogue multiplier output through integration and decision device, can obtain synchronization of data and detect output.

OOK modulation system with the binary data transmission is an example below, in conjunction with accompanying drawing 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 squint.After the preposition amplification of low noise, let 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 simultaneous 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 gets into locking has the synchronous maintenance function of certain hour, can let data subsequently implement aforesaid energy synchronous detecting.The frame structure of transfer of data has 1024 data, generally in 20 to 80 pulse frames intervals, can accomplish synchronously, and the lock in time that also promptly gets into 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 the pulse ultra-broadband communication system is characterized in that: comprise following sequential steps:

(1) simulaed phase locked loop that is linked in sequence by simulation phase discriminator, loop filter and voltage controlled oscillator is set and the pulse ultra-broadband communication system that constitutes by forward and reverse phase-locked loop feedback branch that connects to form along circuits for triggering and square-wave pulse generation circuit, pi/2 phase shift CO circuit order in the device of bunch pulse signal energy synchronization detection method;

(2) let the discrete bunch pulse signal of input pass through a LNA low noise ultra broadband amplifier and a squaring circuit, squaring circuit is a unidirectional bunch of pulse signal with two-way bunch of impulse transfer;

(3) above-mentioned unidirectional bunch of pulse signal sent into the analog phase-locked look main body circuit that joins with squaring circuit; Send into the analog phase-locked look feedback branch through pressure oscillator; This branch road is earlier with VCO circulation circuit voltage-controlled oscillator sine wave output; Trigger with the forward rising, the circuits for triggering that oppositely descend 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; Through the time window width of triggering level control square-wave pulse, realize the energy simultaneous extraction of bunch pulse;

(4), promptly obtain synchronization of data and detect output with analogue multiplier output process integrator and decision device.

2. detection method according to claim 1 is characterized in that: described forward and reversely be connected with level control circuit along circuits for triggering.