WO2016137043A1

WO2016137043A1 - Impulse carrier signal reproduction device for ultra wideband receiver and ultra wideband receiver comprising same

Info

Publication number: WO2016137043A1
Application number: PCT/KR2015/002031
Authority: WO
Inventors: 김동순; 황태호
Original assignee: 전자부품연구원
Priority date: 2015-02-27
Filing date: 2015-03-03
Publication date: 2016-09-01
Also published as: KR20160104933A; KR101658933B1

Abstract

The present invention relates to an ultra wideband (UWB) communication system and, more particularly, to an impulse carrier signal reproduction device capable of reproducing, at a low clock speed, an impulse carrier signal transmitted from an ultra wideband (UWB) transmission terminal, and an ultra wideband receiver comprising the same, the impulse carrier signal reproduction device comprising: an impulse carrier signal detection unit comprising a plurality of impulse carrier signal detectors, each of which is enabled or disabled in accordance with the positive and negative edges of digital impulse carrier signals which are sequentially inputted from an RF processing unit, thereby sequentially generating trigger signals; and an impulse carrier signal reproduction unit for reproducing transmission impulse carrier signals synchronized with an internal standard clock of a receiving terminal by counting the internal standard clock of the receiving terminal according to an input of a series of the trigger signals.

Description

Impulse Carrier Signal Restorer for Ultra-Wideband Receivers and Ultra-Wideband Receivers Comprising the Same

The present invention relates to an ultra wideband (UWB) communication system, and more particularly, to an impulse carrier signal recoverer capable of recovering an impulse carrier signal transmitted from an ultra wideband (UWB) transmitter to a low speed clock, and an ultra wideband receiver including the same.

Ultra wideband (UWB) wireless communication In particular, UWB-impulse radio (UWB-IR) based wireless communication systems do not use carrier waves and transmit electric pulses with constant periods and waveforms of 1 nanosecond. A communication method that transmits and receives data in baseband using short pulses of less than (nanosecond). In the fields requiring precise location recognition such as low power and low speed sensor networks or location recognition, UWB-IR (abbreviated as UWB) based method that does not use a carrier wave is emerging as a next-generation short-range wireless communication technology.

The UWB system does not require a frequency shifting process in the transmitter / receiver, thereby enabling non-coherent communication. In addition, UWB systems do not require a local oscillator (LO) / Mixer, phase locked loop (PLL), etc. (this is called carrier-free). The simple structure of the UWB system not only reduces the material cost and manufacturing cost, but also makes it possible to apply to a wireless body area network (WBAN) system for portable devices by extending the battery life by miniaturization and ultra low power consumption. Do.

In the case of an impulse-based communication technology using the UWB band, an impulse carrier signal generated at a transmitter is generated as an impulse carrier signal of a signal level that can be used in a digital demodulator through a limiter at a receiver. The impulse carrier signal is decoded into signals of "0" and "1" according to a symbol period to generate received data.

According to this method, the limiter output signal is not uniformly generated due to the multipath distortion caused by obstacles and the influence of analog noise. To overcome this, the over-sampled clock is typically used to recover the received impulse carrier signal.

FIG. 1 illustrates an example of an RF received signal based on an impulse method of the IEEE802.15.6 WBAN standard, and illustrates an ADC output of an RF receiver having a data rate of 1.5Mbps and 16Mbps.

As the data rate increases, the period of the received impulse carrier signal also becomes faster, and the interval of the impulse carrier signal also occurs irregularly, so timing correction for pulse detection is necessary. That is, an oversampling technique using a faster clock is used to recover an impulse carrier signal that is faster or later than a predetermined bit rate. In general, a four times oversample clock is used.

As such, the receiving end of the IEEE802.15.6 UWB system uses a high-speed oversample clock to recover the impulse carrier signal, which consumes a lot of power, and furthermore, due to multipath distortion on a communication channel and nonlinear errors in RF and analog signals. Due to the irregular distortion of the pulse width or period, there is a problem in that a bit or symbol error occurs even when an oversample clock is used more than four times.

[Preceding technical literature]

[Patent Documents]

(Patent Document 0001) Republic of Korea Patent Publication No. 10-2012-0061398

(Patent Document 0002) Republic of Korea Patent Publication No. 10-2011-0017659

Accordingly, an object of the present invention is an invention devised to solve the above-described problem, an ultra-wideband impulse carrier signal reconstructor for minimizing the clock speed of a UWB receiver and recovering an impulse carrier signal transmitted from a transmitter, and In providing an ultra-wideband receiver,

Furthermore, another object of the present invention is to provide an impulse carrier signal reconstructor for an ultra-wideband receiver capable of improving the timing characteristics of a received signal while reducing power consumption of a UWB receiver and an ultra-wideband receiver including the same.

In order to solve the above technical problem, an impulse carrier signal recoverer for an ultra-wideband receiver according to an embodiment of the present invention,

An impulse carrier signal detector comprising a plurality of impulse carrier signal detectors, each of which is enabled or disabled according to the positive and negative edges of the digital impulse carrier signal sequentially input from the RF processor to sequentially generate a trigger signal;

And an impulse carrier signal recovery unit for restoring a transmission impulse carrier signal synchronized with the receiver internal reference clock by counting a receiver internal reference clock according to a series of the trigger signal inputs.

Furthermore, the above-described impulse carrier signal detector includes a plurality of impulse carrier signal detectors connected in a multi-stage manner, each impulse carrier signal detector,

Reset to generate an enable signal for enabling the impulse carrier signal detector located at the rear end in accordance with the positive edge of the first impulse carrier signal input in the enable state, and to reset the impulse carrier signal detector located at the front end in accordance with the negative edge. Characterized in that the signal is generated together.

In addition, the impulse carrier signal detector is characterized in that at least four or more impulse carrier signal detector is connected in a multi-stage manner to detect the received impulse carrier signal,

Each of the impulse carrier signal detectors,

A positive edge flip-flop 1 for latching and outputting a reference signal according to the positive edge of the digital impulse carrier signal;

A negative edge flip-flop 1 for latching the reference signal according to the negative edge of the digital impulse carrier signal;

A combiner for combining the outputs of the positive edge flip-flop and the negative edge flip-flop to generate an enable signal for enabling an impulse carrier signal detector located at a rear end thereof;

A positive edge flip-flop 2 for latching the output of the combiner and outputting the trigger signal according to the positive edge of a baseband demodulation clock;

And a negative edge flip-flop 2 which latches the output of the combiner according to the negative edge of the baseband demodulation clock and outputs the reset signal for resetting the impulse carrier signal detector located at the front end.

Furthermore, the ultra-wideband receiver according to the embodiment of the present invention,

An RF processor for receiving an impulse carrier signal transmitted from an ultra wideband transmitter and converting the impulse carrier signal into a baseband impulse signal;

An analog-digital converter for converting the baseband impulse carrier signal into a digital impulse carrier signal;

An impulse carrier signal detector comprising a plurality of impulse carrier signal detectors each generating a trigger signal while being enabled or disabled in accordance with the positive and negative edges of the digital impulse carrier signal;

According to the above-mentioned problem solving means, when each impulse carrier signal detector constituting the multi-stage sequentially generates each trigger signal in accordance with the positive and negative edges of the digital impulse carrier signal inputted sequentially, the impulse carrier signal recovery unit triggers By counting the receiver internal reference clock in accordance with the signal input to sequentially restore the transmit impulse carrier signal synchronized with the receiver internal reference clock, it is faster than the normal impulse carrier signal cycle without using at least four times the high-speed clock at the receiver. A slow period impulse carrier signal can be detected and restored normally.

Therefore, the present invention can reduce the power consumption by 50% compared to the general receiver using at least four times the high-speed clock to recover the transmitted signal, and can improve the timing characteristics of the received signal when the chip is implemented by using a low clock. You can get the effect.

1 is an exemplary RF received signal by an impulse method of the IEEE802.15.6 WBAN standard.

2 is an exemplary configuration of an impulse carrier signal recoverer for an ultra wide band (UWB) receiver according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a detailed configuration of an impulse carrier detector in FIG. 2.

4 is an exemplary impulse carrier signal for explaining the operation of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, detailed descriptions such as known functions or configurations, for example, the detailed configuration and operation of an RF processor (including an antenna, a low noise amplifier, a mixer, a low pass filter, a variable gain amplifier), and a symbol recovery unit of a UWB receiver are described. Since it is already known, a detailed description thereof will be omitted. Furthermore, it is assumed that the positive edge and the negative edge of the terms used below mean the same meaning as the rising edge and the falling edge, respectively, and the trigger signal is a carrier signal recovery unit. It is assumed that the internal reference clock is used as a reference signal for starting counting.

First, FIG. 2 illustrates a configuration of an impulse carrier signal reconstructor for an ultra wideband (UWB) receiver according to an embodiment of the present invention. FIG. 3 is a detailed configuration diagram of the impulse carrier detector 310 of FIG. Respectively illustrates an impulse carrier signal for explaining the operation of the present invention. In FIG. 2, the number of impulse carrier signal detectors constituting the impulse carrier signal detector 300 is limited to four. However, when at least four impulse carrier signal detectors are used, an impulse received at a faster or delayed speed than a normal period is shown. The carrier signal can also be stably restored.

Referring to FIG. 2, the RF processor 100 of an ultra wideband (UWB) receiver receives an impulse carrier signal transmitted from an ultra wideband transmitter and converts the received impulse carrier signal into a baseband impulse signal. The baseband impulse carrier signal is converted into a digital impulse carrier signal and output. The analog-to-digital converter 200 may also be defined as being located after the RF processor 100.

The impulse carrier signal detection unit 300 located at the rear end of the ADC 200 is enabled or disabled in accordance with the positive and negative edges of the digital impulse carrier signal, respectively, and a series of trigger signals (four trigger signals in the embodiment of the present invention). ) In sequence,

The impulse carrier signal recovery unit 400 counts the receiver internal reference clock according to the trigger signal input to recover the transmission impulse carrier signal synchronized with the receiver internal reference clock, and transmits the received impulse carrier signal to the symbol recovery unit. Restore

In the ultra wideband (UWB) receiver having the above-described configuration, the impulse carrier signal detector 300 generates a plurality of impulses connected in a multistage manner to sequentially generate trigger signals TR according to the positive and negative edges of the digital impulse carrier signal.

Carrier signals detectors

310, 320, 330, 340, each impulse carrier signal detector enabling an EN signal for enabling an impulse carrier signal detector located at a rear end in accordance with the positive edge of the first impulse carrier signal input in the enabled state; And generate a reset signal RS for resetting the impulse carrier signal detector located at the leading edge along the negative edge.

Each of the impulse

carrier signal detectors

310, 320, 330, and 340 which generate the above-described signals is positive edge flip-flop 1 311 which latches and outputs the reference signal "1" in accordance with the positive edge of the digital impulse carrier signal as shown in FIG. 3. and,

A negative edge flip-flop 1 312 which latches the reference signal "1" in accordance with the negative edge of the digital impulse carrier signal;

A combiner 313 that combines the outputs of the positive edge flip-flop 1 311 and the negative edge flip-flop 1 312 to generate an enable signal EN for enabling an impulse carrier signal detector located at a rear end thereof;

A positive edge flip-flop 2 314 that latches the output of the combiner 313 as a trigger signal TR in accordance with the positive edge of a baseband demodulation clock;

A negative edge flip-flop 2 315 that latches the output of the combiner 313 according to the negative edge of the baseband demodulation clock and outputs it as a reset signal RS for resetting the impulse carrier signal detector located at the front end. .

In the impulse carrier signal detector having such a configuration, the flip-

flops

311, 312, 314 and 315 and the combiner 313 are reset by the reset signal RS ′ input from the impulse carrier signal detector located at the rear end.

Hereinafter, the operation of the impulse carrier signal recoverer for an ultra wideband (UWB) receiver having the above-described configuration will be described in detail.

First, when the impulse carrier signal transmitted from the UWB transmitter is converted into a baseband impulse signal by the RF processor 100 and passes through the ADC 200, the digitally converted impulse carrier signal is an impulse carrier signal detector according to an embodiment of the present invention. The four impulse

carrier signal detectors

310, 320, 330, and 340 constituting 300 are respectively input.

The three impulse

carrier signal detectors

320, 330, 340 located at the rear end of the four impulse carrier signal detectors remain disabled, while the positive edge flip-flop 1 311 of the first impulse carrier signal detector 310 is located. Latches the reference signal ("1") in accordance with the positive edge of the first digital impulse carrier signal, and negative edge flip-flop 1 (312) also matches the reference signal ("1") in accordance with the negative edge of the first digital impulse carrier signal. Latch output.

The combiner 313 combines the outputs of the positive edge flip-flop 1 311 and the negative edge flip-flop 1 312 to enable the impulse carrier signal detector 320 located at a rear end thereof. Create Due to this enable signal EN, the impulse carrier signal detector 2 320 located at the rear end starts monitoring the detection of the second received impulse carrier signal.

On the other hand, in the positive edge flip-flop 2 314 of the impulse carrier signal detector 1 310, the output of the combiner 313 is latched in accordance with the positive edge of the baseband demodulation clock to the impulse carrier signal recovery unit 400 as a trigger signal. By outputting, the impulse carrier signal recovery unit 400 may count and output the pulse of the first transmission impulse carrier signal synchronized with the receiver internal reference clock by counting the internal reference clock of the receiver according to the trigger signal input.

Meanwhile, the impulse carrier signal detector 2 320 enabled by the first located impulse carrier signal detector 1 310 also has the trigger signal TR and the third in the same manner as the first impulse carrier signal detector 1 310 described above. Generate and output an enable signal (EN) to enable impulse carrier signal detector 3 (330), with negative edge flip-flop 2 (315) matching the output of combiner (315) to the negative edge of the baseband demodulation clock. By latching to generate a reset signal RS for resetting the impulse carrier signal detector 1 310 located at the front end, the first located impulse carrier signal detector 1 310 is reset at the point when the second impulse carrier signal is detected. In this case, the enable signal EN generated by the last impulse carrier signal detector 4 340 is switched to the enabled state.

Of course, the impulse carrier signal recovery unit 400 counts the internal reference clock of the receiver according to the input of the trigger signal input from the second impulse carrier signal detector 2 320 to determine the second transmission impulse carrier signal synchronized with the internal reference clock of the receiver. The pulse is restored.

When the impulse

carrier signal detectors

1,2,3,4 (310, 320, 330, 340) constituting the multi-stage are sequentially generated in accordance with the positive and negative edges of the digital impulse carrier signals sequentially input in the manner described above, The impulse carrier signal recovery unit 400 counts the internal reference clock of the receiver according to the trigger signal input and restores the transmission impulse carrier signal synchronized with the internal reference clock of the receiver, without using a high-speed clock of at least four times at the receiver. As shown in FIG. 4, the impulse carrier signal having a faster (1) or slower (2) period than the normal impulse carrier signal can be detected and restored normally.

Therefore, the present invention can reduce the power consumption by 50% compared to the general receiver using at least four times the high-speed clock to recover the transmission signal, and the effect of improving the timing characteristics of the received signal can be obtained by using the low clock. Can be.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims

An impulse carrier signal detector comprising a plurality of impulse carrier signal detectors each generating a trigger signal while being enabled or disabled in accordance with the positive and negative edges of the digital impulse carrier signal sequentially input from the RF processor;

An impulse carrier signal recovery unit for an ultra-wideband receiver, comprising: an impulse carrier signal recovery unit recovering a transmission impulse carrier signal synchronized with a receiver internal reference clock according to a series of trigger signal inputs group.
The method of claim 1, wherein the impulse carrier signal detector comprises a plurality of impulse carrier signal detector connected in a multi-stage method, each impulse carrier signal detector,

Reset to generate an enable signal for enabling the impulse carrier signal detector located at the rear end in accordance with the positive edge of the first impulse carrier signal input in the enable state, and to reset the impulse carrier signal detector located at the front end in accordance with the negative edge. An impulse carrier signal recoverer for an ultra-wideband receiver characterized in that it generates the signals together.
The impulse carrier signal recoverer of claim 2, wherein the impulse carrier signal detector comprises at least four impulse carrier signal detectors connected in a multistage manner.
The method of claim 2 or 3, wherein each of the impulse carrier signal detector,

A positive edge flip-flop 1 for latching and outputting a reference signal according to the positive edge of the digital impulse carrier signal;

A negative edge flip-flop 1 for latching the reference signal according to the negative edge of the digital impulse carrier signal;

A combiner for combining the outputs of the positive edge flip-flop and the negative edge flip-flop to generate an enable signal for enabling an impulse carrier signal detector located at a rear end thereof;

A positive edge flip-flop 2 for latching the output of the combiner and outputting the trigger signal according to the positive edge of a baseband demodulation clock;

And a negative edge flip-flop 2 which latches the output of the combiner according to the negative edge of the baseband demodulation clock and outputs the reset signal for resetting the impulse carrier signal detector located at the front end. Impulse Carrier Signal Restorer.
An RF processor for receiving an impulse carrier signal transmitted from an ultra wideband transmitter and converting the impulse carrier signal into a baseband impulse signal;

An analog-digital converter for converting the baseband impulse carrier signal into a digital impulse carrier signal;

An impulse carrier signal detector comprising a plurality of impulse carrier signal detectors each generating a trigger signal while being enabled or disabled in accordance with the positive and negative edges of the digital impulse carrier signal;

And an impulse carrier signal restoring unit for restoring a transmission impulse carrier signal synchronized with a receiver internal reference clock by counting a receiver internal reference clock according to a series of the trigger signal inputs.
The method of claim 5, wherein the impulse carrier signal detector comprises at least four impulse carrier signal detector connected in a multi-stage method, each impulse carrier signal detector,

Reset to generate an enable signal for enabling the impulse carrier signal detector located at the rear end in accordance with the positive edge of the first impulse carrier signal input in the enable state, and to reset the impulse carrier signal detector located at the front end in accordance with the negative edge. An ultra-wideband receiver, characterized in that it generates signals together.
The method of claim 6, wherein each impulse carrier signal detector,

A positive edge flip-flop 1 for latching and outputting a reference signal according to the positive edge of the digital impulse carrier signal;

A negative edge flip-flop 1 for latching the reference signal according to the negative edge of the digital impulse carrier signal;

A combiner for combining the outputs of the positive edge flip-flop and the negative edge flip-flop to generate an enable signal for enabling an impulse carrier signal detector located at a rear end thereof;

A positive edge flip-flop 2 for latching the output of the combiner and outputting the trigger signal according to the positive edge of a baseband demodulation clock;

And a negative edge flip-flop 2 that latches an output of the combiner in accordance with a negative edge of the baseband demodulation clock and outputs a reset signal for resetting an impulse carrier signal detector located at a leading edge thereof.