CN1751450A - The use of pseudo-random frequency sequence to reduce pico-net interference in a multi-band UWB network - Google Patents
The use of pseudo-random frequency sequence to reduce pico-net interference in a multi-band UWB network Download PDFInfo
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- CN1751450A CN1751450A CNA2004800041186A CN200480004118A CN1751450A CN 1751450 A CN1751450 A CN 1751450A CN A2004800041186 A CNA2004800041186 A CN A2004800041186A CN 200480004118 A CN200480004118 A CN 200480004118A CN 1751450 A CN1751450 A CN 1751450A
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Abstract
A wireless communication system and method is provided that uses a pseudo-random frequency sequence to reduce pico-net interference in a multi-band ultra wideband network. Pulse are transmitted using a pseudo-random sequence of frequencies such that neighboring pico-nets using the same technique can reduce band overlap thereby reducing mutual interference.
Description
Technical field
The present invention relates to a kind of multi-band communication systems.More particularly, the present invention relates to be used for reduce the system and method for the pico-net interference of multi-band ultra-wideband (Ultra Wide Band) network.More particularly, the present invention relates to utilize pseudo-random frequency sequence to reduce pico-net interference in the multi-band UWB network.
Background technology
Ultra broadband (UWB) system utilizes pulse or transmitter techniques excited by impact, and long pulse was applied directly to output device when wherein the duration was generally tens of picoseconds to several nanoseconds ultrashort, and this output device sends its characteristic pulse response subsequently.For this reason, UWB is known as impulse radio sometimes.In addition, because driving pulse is not modulated, so the UWB system is also called zero-carrier technology.The UWB communication system is operated on the wide range of spectrum with respect to centre frequency, and this grows (being generally the 10-1000 picosecond) pulse in short-term and realize by launching usually.The scope of centre frequency is between 50MHz to 10GHz.Usually the emittance of the ultra wide bandwidth (being that unit is measured usually with GHz) of the 100+% of the feasible frequency of plying in the centre is enough little, so that it can coexist with other device, and can not cause harmful interference to them.
The advantage of UWB enforcement at present comprises low cost, low-power and the resilience force that multipath is disturbed.The UWB resistance of multipath effect come from divide in time rather than the fact of sub-divided pulses radio signal in frequency, and can separate and the time related effect, disturb such as multipath, cause lower average power and for the more high reliability of given power level.For wherein fully separating the current relative low data-rate applications of launching short pulse in time, these advantages are normally real.
Be used for UWB communication along with FCC adopts the 3.1-10.6GHz frequency band, researcher and professional begun one's study be used for high data rate (＞100Mb/s) wireless personal area network (WPAN) use and building in the UWB of application.The market prediction personnel also predict millions of systems based on UWB in several years.
The prior art that most of UWB are relevant implements and research report is applied as target with low speed data rate.This low data rate system utilizes low pulse recurrence rate to design usually.As a result, can make pulse amplitude and pulse distance from very high.This causes the well quotedbenefit of UWB, promptly for the resistance of the interference of disturbing such as multipath.The new application such as the multimedia video distribution of net requires high data rate system, for example 100Mb/s to 500Mb/s.The conventional art that is used for this system needs high pulse repetition rate, reduces the distance between the subsequent pulses.This will make the UWB system that multipath takes place easily and disturb.If the UWB system will compete other narrowband systems, then also to need be cheaply in these UWB systems.The prior art of utilizing equalizer to alleviate the multipath interference has increased the cost of UWB system.
A proposed projects that is used for the UWB system is the multiband modulation scheme that total band segmentation is become a plurality of frequency bands.Then, in each frequency band, launch corresponding pulses.Because UWB is current just to be considered in the WPAN environment, therefore simple multiband scheme causes the interference of a piconet to another piconet.
Therefore, need a kind of solution of avoiding the UWB communication system of a plurality of pico-net interference.
Summary of the invention
System and method of the present invention provides a kind of UWB communication system, and this system utilizes the pico-net interference of pseudo-random frequency sequence reducing from a piconet to the multi-band UWB network of another piconet.With the pseudo random sequence transmitted pulse, so that the probability of overlapping between the adjacent networks (conflict) is very little.
Description of drawings
Fig. 1 a has only shown the wireless network of the UWB communication station that communicates by peer-to-peer communications;
Fig. 1 b has shown the wireless network of being set up and being controlled by the control point, and wherein communication station communicates via the control point and on reciprocity basis;
Fig. 2 a is the simplified block diagram that shows the structure of UWB communication station, has wherein shown the exemplary transmitter section that will use embodiments of the invention;
Fig. 2 b is the simplified block diagram that shows the structure of UWB communication station, has wherein shown the exemplary receiver section that will use embodiments of the invention; With
Fig. 3 has shown according to multiband pseudo-random frequency sequence UWB modulation of the present invention.
Embodiment
In the following description, by example and nonrestrictive mode specific detail such as ad hoc structure, interface, technology etc. is proposed, so that thorough understanding of the present invention to be provided.Yet for the person of ordinary skill of the art, obviously the present invention can implement in deviating from other embodiment of these specific detail.
In order to communicate by letter, the UWB system utilizes the pulse train opposite with individual pulse.For each information bit, output pulse string (or sequence), and modulate this pulse train, so that the UWB system can transmit data.Pulse position modulation is fit to, and passes through mobile forward or backward pulse position or not mobile fully pulse position in time, changes the pulse recurrence interval.Other modulation scheme comprises digital phase modulation, wherein utilizes and represents these finite impulses of numerical data to change the phase place that changes transmitted waveform.In binary phase shift keying (BPSK), the phase modulated waveform with two phase change of two binary bits that generation can representative information.For Quadrature Phase Shift Keying (QPSK), have four phase change of four binary bits that can representative data, thereby effectively double bandwidth.Other modulation technique comprises Orthodoxy Frequency Division Multiplex (OFDM) and quadrature amplitude modulation (qam).
By signal and non-limiting way, Fig. 1 a has shown the representative wireless network that will use embodiments of the invention.As shown in Figure 1a, communication unit 100 is only communicated by letter on reciprocity basis via Radio Link 110.Fig. 1 b has shown the representative network that also will use embodiments of the invention.Shown in Fig. 1 b, communication unit 100 is not only communicated by letter on reciprocity basis via Radio Link 110, and communicates via the Radio Link 120 of extremely/certainly setting up the control point 130 of piconet at first.Key principle of the present invention provides a kind of mechanism, thereby when two types UWB piconet of communication unit 100 is located adjacent one another, makes this UWB piconet minimally of two types interfering with each other.
Fig. 2 a-b provides exemplary transmitter and receiver structure, its each employing antenna.Only by the signal but not any limited significance comprises antenna.Can be by any means, such as sending and received signal via the cable or the integrated circuit that can serve as antenna.The structure that comprises Fig. 2 a-b is discussed and description the present invention with auxiliary.
Referring now to the transmitter subsystem (235) of Fig. 2 a,, the wireless communication unit 100 of the UWB network of Fig. 1 a or Fig. 1 b can comprise transmitter subsystem (235), has the transmitter architecture shown in the block diagram of Fig. 2 a, and embodiments of the invention will be applied to it.Shown in Fig. 2 a, communication unit can comprise interface 200, buffer 210, modulator 220, UWB transmitting set 230, controller 240, data storage 250, antenna 260 and pseudo-random noise source 270.Controller 240 detects the entry of the information signal in the buffer 210, and determines adopted time, amplitude and phase modulated based on sub-band channel conditions then, and the modulation of determining is indicated to modulator 220.The example system of Fig. 2 a is used for explanation.UWB transmitting set 230 is coupled to antenna 260, wishes data with emission.
Referring now to the receiver subsystem (295) of Fig. 2 b,, the wireless communication unit 100 of the UWB network of Fig. 1 a-Fig. 1 b can comprise receiver subsystem (295), has the receiver structure shown in the block diagram of Fig. 2 b, and embodiments of the invention will be applied to it.Shown in Fig. 2 b, communication unit can comprise interface 200, buffer 210, demodulator 280, UWB wireless receiver 290, controller 240, data storage 250, antenna 260 and pseudo-random noise source 270.Antenna 260 is coupled to UWB wireless receiver 290, is used to receive the impulse radio signal of propagation.Controller 240 detects 290 pairs of receptions that transmit of receiver, and determines adopted time, amplitude and phase modulated according to sub-band channel conditions then, and the modulation of determining is indicated to demodulator 280.The example system of Fig. 2 b is used for illustration purpose.
Although this description can relate to the term that generally is used to describe the particular transceiver system, these descriptions and notion are equally applicable to other treatment system, comprise having the system that is different from the structure shown in Fig. 2 a-Fig. 2 b.
Suppose that the UWB channel is divided into N frequency band, wherein total frequency band is divided into these N frequency band.In a preferred embodiment, in each frequency band, use pseudo-random frequency sequence to come corresponding pulses in the transmit burst subsequently, that is, use pseudo-random number sequence to select the ordering of N frequency band.
For example, if having 4 frequency bands, each frequency band is expressed as f1, f2, f3, f4, and then the pulse train by a network emission can be f1, f3, f4, f2.Another adjacent network can use f3, f2, f4, f1 to launch subsequently.This guarantees maximum overlapping only be limited to frequency band, i.e. a f4.However, the probability of such overlapping (conflict) is very little.Other frequency band is not overlapping fully.Utilize traditional solution, be fixed for the frequency sequence of all piconets, and make it mutually the same.As a result, the interference in all frequency bands is a kind of possibility.Such interference causes reducing the capacity of whole network.
In a preferred embodiment, come Data transmission by modulating each pulse.Pulse position, binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK), Orthodoxy Frequency Division Multiplex (OFDM) and quadrature amplitude modulation (qam) are possible various modulation techniques.
In a preferred embodiment, receiver is known the order of tranmitting frequency in advance.This sequence is determined by the UWB communication unit 100 of setting up piconet, and is transmitted to each the UWB communication unit 100 that adds this piconet.Whether having the control point is inessential really, for each communication unit 100, has and knows that how synchronous this sequence and means just passable.Receiver is known expected frequence at special time subsequently.At any given time, signal that the receiver demodulation sends via known subband and the frequency band of ignoring other.
Fig. 3 has shown that wherein the order of the centre frequency of pulse is the UWB pulse of f1, f3, f2, f4.Adjacent network utilizes different frequency sequences, to reduce the maximum collision among a plurality of piconets.The random sequence of the N quantity that adjacent network generation and any other piconet sequence are inequality is to determine the ordering of its pulsion phase for its N frequency band.
Example shown in Figure 3 is divided into the time in 80ns (nanosecond) cycle of repetition same frequency sequence.This time 80 nanosecond further is divided into 20 nanosecond period that are used for each independent frequency band.In each 20 nanosecond interval, modulating pulse is with Data transmission.Yet 80 nanosecond period are an example, and also can be 300 nanoseconds or 20 nanoseconds.Also have, utilize other modulation scheme, Orthodoxy Frequency Division Multiplex (OFDM) for example, Fig. 3 might be different.
The present invention can implement with other particular form under the condition that does not deviate from spirit of the present invention or essential characteristic.The embodiment that is provided only is for example, and without any limited significance.Therefore scope of the present invention is indicated by appending claims rather than by foregoing description, and falls into the implication of equivalent of claims and all modifications in the scope all is scheduled to be comprised among the present invention.
Claims (16)
1, a kind of equipment that is used for multi-band ultra-wideband (UWB) communication system comprises:
Transmitter subsystem comprises:
(a) controller is configured to the UWB channel distribution is become the pseudo random sequence of N subband;
(b) modulator is configured to provide the sequence of modulating pulse; With
(c) transmitter is configured to via each modulating pulse in the described sequence of one of described sequence of N subband emission; With
Receiver subsystem comprises:
(d) receiver is configured to receive the UWB signal via described N subband emission;
(e) controller is configured to the sequence of handle according to the synthetic modulating pulse of sets of signals of the pseudo random sequence reception of a described N subband; With
(f) demodulator is configured to the sequence of demodulation modulating pulse.
2, equipment according to claim 1, wherein:
Described transmitter (c) further comprises from by antenna, cable with serve as the device of selecting the group that the integrated circuit (IC) of antenna forms that is used to send; With
Described receiver (d) further comprises from by antenna, cable with serve as the device of selecting the group that the integrated circuit (IC) of antenna forms that is used to receive.
3, equipment according to claim 1, wherein modulator (b) further is configured to (b.1) and uses the modulation technique in the group of being made up of pulse position, binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK), Orthodoxy Frequency Division Multiplex (OFDM) and quadrature amplitude modulation (qam) to modulate each pulse.
4, equipment according to claim 1, wherein:
Controller (a) further is configured to:
(a.1) repetition rate sequence on the predetermined time cycle; With
(a.2) for each frequency in the sequence, predetermined period of time is divided at least one subcycle; With
Modulator (b) further is configured to:
(b.1) at least one each pulse of subcycle internal modulation, with Data transmission.
5, equipment according to claim 4, wherein:
Modulator (b) further is configured to:
(b.2) use the modulation technique in the group of forming by pulse position, binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK), Orthodoxy Frequency Division Multiplex (OFDM) and quadrature amplitude modulation (qam) to modulate each pulse.
6, equipment according to claim 4 wherein select described predetermined period of time from the group of being made up of 20ns, 80ns, 300ns, and described at least one subcycle is to be removed by N in this cycle.
7, equipment according to claim 1, wherein said controller uses transmitter to send pseudo-random frequency sequence to receiver subsystem, so that receiver subsystem is known the signal via the known subband transmission among the described N subband at any given time.
8, equipment according to claim 7 is wherein gone up at any given time, and the pulse that receiver subsystem is configured to use the pseudo-random frequency sequence of transmission to come demodulation to launch is known via the known subband among the described N subband to send this pulse.
9, equipment according to claim 7, wherein receiver subsystem is the founder of another piconet, and is configured to utilize different pseudo-random frequency sequences to avoid overlapping with the piconet of transmitter subsystem.
10, equipment according to claim 1, wherein receiver subsystem is the founder of another piconet, and is configured to utilize different pseudo-random frequency sequences to avoid overlapping with the piconet of transmitter subsystem.
11, a kind of method that is used to use super-broadband tech transmission data, described method comprises:
(a) provide the transmitter subsystem that is configured to carry out following steps:
(a.1) the UWB channel distribution is become the pseudo random sequence of N subband;
(a.2) signal is modulated to pulse train; With
(a.3) via each modulating pulse in the described sequence of one of described sequence of N subband emission; With
(b) provide the receiver subsystem that is configured to carry out following steps:
(b.1) receive the UWB signal of launching via described N subband;
(b.2) according to N subband of pseudo random sequence combined reception; With
(b.3) series of demodulating uwb pulse from N subband of combination.
12, method according to claim 11, wherein transmitter subsystem further is configured to carry out following steps:
(a.4) repeat this frequency sequence on the predetermined time cycle;
(a.5) for each frequency of this sequence, predetermined period of time is divided at least one subcycle; With
Modulation step (a.2) further may further comprise the steps:
(a.2.1) in each pulse of subcycle internal modulation, with Data transmission.
13, method according to claim 12, wherein modulation step (a.2) further comprises the step (a.2.2) of selecting modulation technique from the group of being made up of pulse position, binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK), Orthodoxy Frequency Division Multiplex (OFDM) and quadrature amplitude modulation (qam).
14, method according to claim 12 wherein select described predetermined period of time from the group of being made up of 20ns, 80ns, 300ns, and described at least one subcycle is to be removed by N in this cycle.
15, method according to claim 11 further may further comprise the steps (a.6): pseudo-random frequency sequence is sent to receiver subsystem, so that receiver subsystem is known the signal that sends via known subband at any given time.
16, method according to claim 15 further may further comprise the steps (c): go up at any given time, use the random frequency sequence that transmits to come the pulse of demodulation emission by receiver subsystem, know via known subband to send this pulse.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44718103P | 2003-02-13 | 2003-02-13 | |
| US60/447,181 | 2003-02-13 | ||
| US60/478,781 | 2003-06-16 |
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| Publication Number | Publication Date |
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| CN1751450A true CN1751450A (en) | 2006-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2004800041186A Pending CN1751450A (en) | 2003-02-13 | 2004-02-09 | The use of pseudo-random frequency sequence to reduce pico-net interference in a multi-band UWB network |
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| ZA (1) | ZA200506410B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672928B (en) * | 2009-09-29 | 2012-05-30 | 中南大学 | Automatic testing system of pseudorandom multi-frequency instrument receiver |
| CN109564247A (en) * | 2016-08-17 | 2019-04-02 | 德克萨斯仪器股份有限公司 | Electric energy meter circuit front end with centreless PCB transformer |
| CN114145067A (en) * | 2019-07-24 | 2022-03-04 | 赛普拉斯半导体公司 | Apparatus, system, and method for mitigating interference in a wireless network |
-
2004
- 2004-02-09 CN CNA2004800041186A patent/CN1751450A/en active Pending
-
2005
- 2005-08-11 ZA ZA200506410A patent/ZA200506410B/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672928B (en) * | 2009-09-29 | 2012-05-30 | 中南大学 | Automatic testing system of pseudorandom multi-frequency instrument receiver |
| CN109564247A (en) * | 2016-08-17 | 2019-04-02 | 德克萨斯仪器股份有限公司 | Electric energy meter circuit front end with centreless PCB transformer |
| CN114145067A (en) * | 2019-07-24 | 2022-03-04 | 赛普拉斯半导体公司 | Apparatus, system, and method for mitigating interference in a wireless network |
| US11503612B2 (en) | 2019-07-24 | 2022-11-15 | Cypress Semiconductor Corporation | Microwave oven coexistence with Wi-Fi/BT |
| CN114145067B (en) * | 2019-07-24 | 2023-04-28 | 赛普拉斯半导体公司 | Apparatus, system, and method for mitigating interference in a wireless network |
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| Publication number | Publication date |
|---|---|
| ZA200506410B (en) | 2006-12-27 |
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Open date: 20060322 |