KR20160104933A - Impulse carrier recovery and uwb receiver included the recovery - Google Patents

Impulse carrier recovery and uwb receiver included the recovery Download PDF

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KR20160104933A
KR20160104933A KR1020150027846A KR20150027846A KR20160104933A KR 20160104933 A KR20160104933 A KR 20160104933A KR 1020150027846 A KR1020150027846 A KR 1020150027846A KR 20150027846 A KR20150027846 A KR 20150027846A KR 20160104933 A KR20160104933 A KR 20160104933A
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carrier signal
impulse carrier
impulse
signal
accordance
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KR1020150027846A
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KR101658933B1 (en
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김동순
황태호
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전자부품연구원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H04L7/0087—Preprocessing of received signal for synchronisation, e.g. by code conversion, pulse generation or edge detection

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Abstract

The present invention relates to an ultra wideband (UWB) communication system, and more particularly, to an ultra wide band receiver including the impulse carrier signal reconstructor capable of recovering an impulse carrier signal transmitted from an ultra wideband (UWB) An impulse carrier signal detector including a plurality of impulse carrier signal detectors successively generating trigger signals while being enabled or disabled respectively in accordance with positive and negative edges of a digital impulse carrier signal sequentially input from a processing unit; And an impulse carrier signal restoring unit for counting a reference internal clock of the receiving end according to a signal input to recover a transmission impulse carrier signal synchronized with a receiving end reference clock.

Figure P1020150027846

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an impulse carrier signal reconstructor for an ultra wideband receiver, and an ultra wide band receiver including the same.

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

Ultra wideband (UWB) wireless communication In particular, a UWB-impulse radio (UWB-IR) based wireless communication system uses an electric pulse having a constant period and waveform without using a carrier for 1 nanosecond and transmits and receives data to and from the baseband using a short pulse equal to or less than (nanosecond). UWB-IR (hereinafter abbreviated as UWB), which does not use a carrier wave, is attracting attention as a next generation short-range wireless communication technology in a field requiring precise location recognition such as low-power, low-speed sensor networks and position recognition.

Since the UWB system does not require a frequency transition process in the transmitter / receiver, non-coherent communication is possible. In addition, the UWB system does not require a local oscillator (LO) / mixer, a phase locked loop (PLL), etc. (this is referred to as carrier free). The simple structure of this UWB system not only reduces the material cost and manufacturing cost but also makes it possible to apply to WBAN (wireless body area network) system by application of portable equipment by making battery life longer due to miniaturization and ultra low power consumption Do.

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

When this method is followed, a phenomenon occurs that the limiter output signal can not be generated uniformly due to multipath distortion caused by obstacles and distortion caused by the influence of analog noise. In order to overcome this, the received impulse carrier signal is recovered by using an oversampled clock.

FIG. 1 shows an example of an RF reception signal by the impulse method of the IEEE802.15.6 WBAN standard, and shows the ADC output of the RF receiver with data rates of 1.5 Mbps and 16 Mbps.

As the data rate increases, the period of the reception impulse carrier signal becomes faster, and the interval of the impulse carrier signal also irregularly occurs. Therefore, timing correction for pulse detection must be performed. That is, in order to recover an impulse carrier signal that comes earlier or later than a predetermined bit rate, a faster clock-based oversampling technique is used. In general, a 4 times oversample clock is used.

As described above, the receiving end of the IEEE 802.15.6 UWB system uses a high-speed oversample clock for restoring the impulse carrier signal, thereby consuming a large amount of power, and furthermore, multipath distortion on the communication channel and nonlinear error of RF and analog signals The pulse width or the period is irregularly distorted, so that bit or symbol error appears even if an oversample clock of 4 times or more is used.

Korean Patent Publication No. 10-2012-0061398 Korean Patent Publication No. 10-2011-0017659

An object of the present invention is to provide an UWB receiver impulse carrier signal reconstructor capable of normally restoring an impulse carrier signal transmitted from a transmitter while minimizing a clock speed of a UWB receiver, The present invention provides an ultra-wideband receiver including the above-

Still another object of the present invention is to provide an UWB receiver for an UWB receiver capable of improving the timing characteristic of a received signal while reducing power consumption of the UWB receiver, and an ultra wideband receiver including the UWB receiver.

According to an aspect of the present invention, there is provided an impulse carrier signal reconstructor for an ultra-wideband receiver,

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

And an impulse carrier signal restoring unit for counting a reference clock in the receiving end in accordance with a series of the trigger signal inputs to recover a transmission impulse carrier signal synchronized with the receiving end reference clock,

Further, 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 comprising:

Generating 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 inputted in the enable state and resetting the impulse carrier signal detector located at the front end in accordance with the negative edge And a signal is generated together.

The impulse carrier signal detector may further include at least four impulse carrier signal detectors connected in a multi-stage manner in order to detect a stable received impulse carrier signal.

Wherein each of the impulse carrier signal detectors comprises:

A positive edge flip flop 1 latching a reference signal in accordance with a positive edge of the digital impulse carrier signal;

A negative edge flip-flop 1 latching the reference signal according to a 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 a downstream impulse carrier signal detector;

A positive edge flip flop 2 latching the output of the combiner in accordance with the positive edge of the baseband demodulation clock and outputting the result as the trigger signal;

And a negative edge flip flop 2 latching the output of the combiner in accordance with a negative edge of the baseband demodulation clock and outputting a reset signal for resetting the impulse carrier signal detector located at the front end.

Furthermore, the UWB receiver according to the embodiment of the present invention includes:

An RF processor for receiving the impulse carrier signal transmitted from the UWB transmitter and converting the received impulse carrier signal into a baseband impulse signal;

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

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

And an impulse carrier signal decompression unit for recovering a transmission impulse carrier signal synchronized with a reception internal reference clock by counting a reception internal reference clock in accordance with a series of the trigger signal inputs.

According to the above-mentioned problem solving means, when each of the impulse carrier signal detectors constituting the multi-stage sequentially generates the respective trigger signals in accordance with the positive and negative edges of the digital impulse carrier signal sequentially inputted, It is possible to recover the transmission impulse carrier signal synchronized with the receiving-end reference clock by sequentially counting the receiving-end reference clock in accordance with the signal input so that the receiving impulse carrier signal is faster than the normal impulse carrier signal period without using the high- The impulse carrier signal of the slow period can be normally detected and recovered.

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

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of an RF received signal by the impulse method of the IEEE 802.15.6 WBAN standard. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an UWB (UWB) receiver.
3 is a diagram illustrating a detailed configuration of an impulse carrier detector in FIG.
4 is an illustration of an impulse carrier signal for explaining the operation of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, detailed description and operation of the RF processor (including antenna, low noise amplifier, mixer, low-pass filter, variable gain amplifier) and symbol restoration section of a UWB receiver, And the detailed description thereof will be omitted. Further, it is assumed that the positive edge and the negative edge among the terms used in the following description have the same meaning as the rising edge and the falling edge, respectively, It is assumed that the internal reference clock is used as a reference signal for starting counting.

2 is a block diagram illustrating a configuration of an impulse carrier signal reconstructor for an ultra wideband (UWB) receiver according to an embodiment of the present invention. FIG. 3 shows a detailed configuration of the impulse carrier detector 310 in FIG. Respectively illustrate the 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 4. However, if at least four or more impulse carrier signal detectors are used, The carrier signal can be restored stably.

2, an RF processor 100 of an ultra wideband (UWB) receiver receives an impulse carrier signal transmitted from an UWB transmitter and converts the impulse carrier signal to a baseband impulse signal, and an analog-to-digital converter (ADC) Converts the baseband impulse carrier signal into a digital impulse carrier signal, and outputs the digital impulse carrier signal. The analog-to-digital converter 200 may also be defined as being located at the rear end of the RF processor 100.

The impulse carrier signal detecting 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 to generate a series of trigger signals (four trigger signals ),

The impulse carrier signal restoring unit 400 counts the receiving end reference clock in accordance with a series of the trigger signal inputs, restores the transmission impulse carrier signal synchronized with the receiving end reference clock, and transmits the transmission impulse carrier signal to the symbol recovering unit, Restore.

In the UWB receiver having the above-described configuration, the impulse carrier signal detector 300 detects a plurality of impulse carrier signals, which are connected in a multi-stage manner to sequentially generate the trigger signals TR in accordance with the positive and negative edges of the digital impulse carrier signal, Carrier signal detectors (310, 320, 330, 340), wherein each impulse carrier signal detector includes an enable signal (EN) for enabling the impulse carrier signal detector located downstream in accordance with the positive edge of the first impulse carrier signal input in the enable state, And generates a reset signal RS for resetting the impulse carrier signal detector located at the front end in accordance with the negative edge.

As shown in FIG. 3, each of the impulse carrier signal detectors 310, 320, 330 and 340 for generating the above-described signals includes a positive edge flip-flop 311 for latching the reference signal ("1 ") in accordance with the positive edge of the digital impulse carrier signal, and,

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

A combiner 313 which combines the outputs of the positive edge flip-flop 311 and the negative edge flip-flop 312 to generate an enable signal EN for enabling the impulse carrier signal detector located at the subsequent stage,

A positive edge flip flop 314 for latching the output of the combiner 313 in accordance with the positive edge of the baseband demodulation clock and outputting it as a trigger signal TR,

And a negative edge flip flop 315 for latching the output of the combiner 313 in accordance with the negative edge of the baseband demodulation clock and outputting 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, each of the flip-flops 311, 312, 314, and 315 and the combiner 313 are reset by a reset signal RS 'input from the impulse carrier signal detector located at the rear end.

Hereinafter, the operation of the UWB receiver impulse carrier signal restorer having the above-described configuration will be further described.

The impulse carrier signal transmitted from the UWB transmitter is converted into a baseband impulse signal in the RF processor 100 and then passed through the ADC 200 to convert the impulse carrier signal into an impulse carrier signal in accordance with an embodiment of the present invention 300, 330, and 340 constituting the first to third impulse carrier signal detectors 310, 320, 330, and 340, respectively.

The three impulse carrier signal detectors 320, 330, and 340 located at the rear end of the four impulse carrier signal detectors maintain the disabled state, while the positive edge flip flop 311 of the impulse carrier signal detector 310 located at the first front end maintains a state of ' Quot; 1 "in synchronism with the positive edge of the first digital impulse carrier signal and the negative edge flip-flop 312 also latches the reference signal" 1 " .

The combiner 313 combines the outputs of the positive edge flip-flop 311 and the negative edge flip-flop 312 to generate an enable signal EN for enabling the impulse carrier signal detector 320 located at the subsequent stage, . By this enable signal EN, the impulse carrier signal detector 2 320 located at the downstream 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 be supplied to the impulse carrier signal restoring unit 400 The impulse carrier signal restoring unit 400 can recover the pulse of the first transmission impulse carrier signal synchronized with the receiving-end reference clock by counting the receiving-end reference clock in accordance with the input of the trigger signal.

Meanwhile, the impulse carrier signal detector 2 320, which is enabled by the first impulse carrier signal detector 1 310, also receives the trigger signal TR in the same manner as the first impulse carrier signal detector 310, (EN) for enabling the impulse carrier signal detector 3 330. At this time, the negative edge flip flop 315 outputs the output of the combiner 315 in accordance with the negative edge of the baseband demodulation clock The first impulse carrier signal detector 310 is reset at the time when the second impulse carrier signal is detected by generating the reset signal RS for resetting the impulse carrier signal detector 310 located at the front end , And the enable signal EN generated by the impulse carrier signal detector 4 (340) positioned at the end.

Of course, the impulse carrier signal restoring unit 400 counts the receiving end reference clock in accordance with the input of the trigger signal input from the second impulse carrier signal detector 2 (320), and outputs the second transmission impulse carrier signal synchronized with the receiving end reference clock Pulse is restored and output.

When the respective impulse carrier signal detectors 1, 2, 3, 4 (310, 320, 330, 340) constituting the multi-stage in the above-described manner sequentially generate the respective trigger signals in accordance with the positive and negative edges of the digital impulse carrier signal sequentially inputted , The impulse carrier signal restoring unit 400 counts the reference internal clock in accordance with the input of the trigger signal and restores the transmission impulse carrier signal synchronized with the internal reference clock of the receiving end, It is possible to normally detect and restore the impulse carrier signal having a period that is earlier or shorter than the period of the normal impulse carrier signal as shown in FIG.

Therefore, the present invention can reduce the power consumption by about 50% as compared with a general receiver using a high-speed clock at least four times in order to recover a transmission signal, and can improve a timing characteristic of a received signal by using a low clock .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined only by the appended claims.

Claims (7)

An impulse carrier signal detector including a plurality of impulse carrier signal detectors sequentially generating trigger signals while being enabled or disabled in accordance with positive and negative edges of a digital impulse carrier signal sequentially input from an RF processor;
And an impulse carrier signal recovery unit for recovering a transmission impulse carrier signal synchronized with a reception internal reference clock by counting a reception internal reference clock in accordance with a series of the trigger signal inputs. group.
The apparatus of claim 1, wherein the impulse carrier signal detector includes a plurality of impulse carrier signal detectors connected in a multi-stage manner,
Generating 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 inputted in the enable state and resetting the impulse carrier signal detector located at the front end in accordance with the negative edge And a signal generator for generating an impulse carrier signal for the UWB receiver.
The impulse carrier signal detector of claim 2, wherein the impulse carrier signal detector is connected to at least four impulse carrier signal detectors in a multi-stage manner.
The method of claim 2 or 3, wherein each of the impulse carrier signal detectors comprises:
A positive edge flip flop 1 latching a reference signal in accordance with a positive edge of the digital impulse carrier signal;
A negative edge flip-flop 1 latching the reference signal according to a 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 a downstream impulse carrier signal detector;
A positive edge flip flop 2 latching the output of the combiner in accordance with the positive edge of the baseband demodulation clock and outputting the result as the trigger signal;
And a negative edge flip flop 2 latching an output of the combiner in accordance with a negative edge of the baseband demodulation clock and outputting a reset signal for resetting the impulse carrier signal detector located at the front end. Impulse carrier signal restorer.
An RF processor for receiving the impulse carrier signal transmitted from the UWB transmitter and converting the received impulse carrier signal into a baseband impulse signal;
An analog-to-digital converter for converting the baseband impulse carrier signal into a digital impulse carrier signal;
An impulse carrier signal detector including a plurality of impulse carrier signal detectors for sequentially generating trigger signals while being enabled or disabled in accordance with positive and negative edges of the digital impulse carrier signal;
And an impulse carrier signal decompression unit for recovering a transmission impulse carrier signal synchronized with a reception internal reference clock by counting a reception internal reference clock in accordance with a series of the trigger signal inputs.
6. The apparatus of claim 5, wherein the impulse carrier signal detector comprises four or more impulse carrier signal detectors connected in a multistage manner,
Generating 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 inputted in the enable state and resetting the impulse carrier signal detector located at the front end in accordance with the negative edge Signal is generated at the same time.
7. The apparatus of claim 6, wherein each of the impulse carrier signal detectors comprises:
A positive edge flip flop 1 latching a reference signal in accordance with a positive edge of the digital impulse carrier signal;
A negative edge flip-flop 1 latching the reference signal according to a 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 a downstream impulse carrier signal detector;
A positive edge flip flop 2 latching the output of the combiner in accordance with the positive edge of the baseband demodulation clock and outputting the result as the trigger signal;
And a negative edge flip flop (2) latching an output of the combiner in accordance with a negative edge of the baseband demodulation clock and outputting a reset signal for resetting the impulse carrier signal detector located at the front end.
KR1020150027846A 2015-02-27 2015-02-27 Impulse carrier recovery and uwb receiver included the recovery KR101658933B1 (en)

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PCT/KR2015/002031 WO2016137043A1 (en) 2015-02-27 2015-03-03 Impulse carrier signal reproduction device for ultra wideband receiver and ultra wideband receiver comprising same

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345471A (en) * 1993-04-12 1994-09-06 The Regents Of The University Of California Ultra-wideband receiver
US20030086511A1 (en) * 2001-09-27 2003-05-08 Stmicroelectronics S.A. Method and device for detecting pulses of an incident pulse signal of the ultra wideband type
KR20110017659A (en) 2009-08-14 2011-02-22 인하대학교 산학협력단 Ultra-wideband transreceiver for wireless body area network
KR20120061398A (en) 2010-12-03 2012-06-13 한국전자통신연구원 Method and apparatus for generating pulse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298812B1 (en) * 2001-09-27 2015-03-11 STMicroelectronics S.A. Method and apparatus for decoding an incoming ultra wideband impulse signal, in particular for a wireless communication system
US7397870B2 (en) * 2002-06-07 2008-07-08 Texas Instruments Incorporated Ultra-wideband (UWB) receiver
US8098707B2 (en) * 2006-01-31 2012-01-17 Regents Of The University Of Minnesota Ultra wideband receiver

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345471A (en) * 1993-04-12 1994-09-06 The Regents Of The University Of California Ultra-wideband receiver
US20030086511A1 (en) * 2001-09-27 2003-05-08 Stmicroelectronics S.A. Method and device for detecting pulses of an incident pulse signal of the ultra wideband type
KR20110017659A (en) 2009-08-14 2011-02-22 인하대학교 산학협력단 Ultra-wideband transreceiver for wireless body area network
KR20120061398A (en) 2010-12-03 2012-06-13 한국전자통신연구원 Method and apparatus for generating pulse

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