WO2010069351A1 - Method, transmission device, receiving device and communication system for wireless data transmission - Google Patents

Method, transmission device, receiving device and communication system for wireless data transmission Download PDF

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Publication number
WO2010069351A1
WO2010069351A1 PCT/EP2008/010880 EP2008010880W WO2010069351A1 WO 2010069351 A1 WO2010069351 A1 WO 2010069351A1 EP 2008010880 W EP2008010880 W EP 2008010880W WO 2010069351 A1 WO2010069351 A1 WO 2010069351A1
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WO
WIPO (PCT)
Prior art keywords
frequency channel
frequency
characterized
communication system
center frequency
Prior art date
Application number
PCT/EP2008/010880
Other languages
German (de)
French (fr)
Inventor
Jens Grebner
Sven Kerschbaum
Thomas Talanis
Frank Volkmann
Christoph Weiler
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/EP2008/010880 priority Critical patent/WO2010069351A1/en
Publication of WO2010069351A1 publication Critical patent/WO2010069351A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7097Interference-related aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource
    • H04W72/0453Wireless resource allocation where an allocation plan is defined based on the type of the allocated resource the resource being a frequency, carrier or frequency band
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/08Wireless resource allocation where an allocation plan is defined based on quality criteria
    • H04W72/082Wireless resource allocation where an allocation plan is defined based on quality criteria using the level of interference

Abstract

The invention relates to a method for wireless data transmission in a communication system, said method being particularly insensitive to interfering influences and at the same effective, wherein a data signal to be transmitted is subjected to a band spread and the spread signal is transmitted in a frequency channel (19), the center frequency of the frequency channel (19) being cyclically displaced by a fraction of the bandwidth of the frequency channel (19). The invention also relates to a transmission device, a receiving device and a communication system for wireless data transmission.

Description

description

Method, transmitting device, receiving device and communication system for wireless data transmission

The invention relates to a method for wireless data transmission in a communication system wherein a data signal to be transmitted to a band spreading subjected and the spread signal is transmitted in a frequency channel.

Such a process is, for example, from the specification of the IEEE 802.15.4 "IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - spe- cific requirements; Part 15.4: Wireless Medium Access Control (MAC) and Physical layer (PHY) Specifications for low-rate Wireless personal Area networks (WPANs), 8 September 2006 "known.

Generally it is the idea of ​​a spread spectrum, that is to spread spectrally by spread spectrum transmission, provide a data to be transmitted or output signal by a predetermined bit sequence. This has the consequence that, due to the band spreading a greater bandwidth for transmission of the data signal is required while at the same time but also reduces the energy density in the frequency spectrum, so that other signals are less disturbed. In addition to advantages in terms of privacy, which are particularly in the field of defense technology important Bandspreizverfah- are reindeer, such as the procedure "Direct Sequence Spread Spectrum (DSSS)," advantageously particularly resistant to narrow band interference, since such interference in despreading the signal, ie, suppressed at the receiving side recovering the data signal. in the context of the IEEE 802.15.4, the increasingly is used as a basis for different communication protocols, such as WirelessHART or Zigbee, in particular in the field of automation technology, distribution, are (in the so-called ISM Industrial, Scientific, Medical) frequency band at 2.4 GHz frequency channels 16 defined, each having a band or channel width of 2 MHz and a channel spacing of 5 MHz. a data transmission between user equipment of the communication system, that is, a transmitting-ESTABLISHMENT g and a receiving device, takes place in accordance with IEEE 802.15.4 using each one of these frequency channels. Due to physical conditions, it may in the radio transmission between the user equipment to transmission disturbances, for example in the form of "radio holes" come. Appropriate transmission faults, which are usually both spatially and frequency-dependent, can arise for example due to superimposed waves or wave cancellation that may be caused for example by echo or multipath.

The object of the present invention is based is to provide a particularly insensitive to interference and at the same time efficient method of the type mentioned.

This object is inventively achieved by a method for wireless data transmission in a communication system, wherein an item to transfer data signal of a Bandsprei- subjected Zung and the spread signal is transmitted channel in a frequency and the center frequency of the frequency channel cyclically by a fraction of the bandwidth of the frequency channel is moved. The inventive method is advantageous because by the cyclic shift of the center frequency of the frequency channel frequency-dependent interference used for data transmission, such as a frequency-related attenuation in radio holes, can be at least partially compensated. The fundamental difference to methods for wireless transmission, in which frequency hopping is used such as in Bluetooth, the inventive method is characterized in that the center frequency of the frequency channel is cyclically shifted by only a fraction of the bandwidth of the frequency channel. This means that the frequency channel is not changed, but only takes place a relatively small change in the center frequency of the frequency channel. Advantageously, this is done while maintaining the bandwidth of the frequency channel, so that losses in terms of available bandwidth can be avoided.

The inventive method also avoids the disadvantage of known frequency hopping that a "frequency frequency hopping" Although the effects of a disturbed frequency channel for data transmission generally reduced, but the number of ever affect by this disturbance of a frequency channel Datenübertragun- gen increased. Cause for this is that a disturbed frequency channel in conventional frequency hopping continue with unchanged center frequency - is used, while in the novel process in fundamental contrast, a displacement of the center frequency of the frequency channel - and thus possibly also with unchanged frequency-dependent disorder.

By applying the method of the invention can thus be the insensitivity of data transmissions overall genüber disorders, ie the robustness of the data transmission improve. This is for example used in the field of automation communication systems to user equipment in the form of sensors and actuators of particular importance, since particularly high requirements exist noise immunity of data transmission. The inventive method also offers the advantage that the performance of the communication system is not affected, since a reduction in the sides of the communication system least total bandwidth provided is avoided.

The cyclic shift of the center frequency of the frequency channel is usually done in accordance with a predetermined algorithm known to all subscriber devices of the communication system or at least to a respective frequency channel-use user equipments or is made known. This ensures that both the transmitting and receiving side is known at all times, which center frequency of the frequency channel to be used for the transmission of a data signal or the relevant part of the data signal.

It should be noted that a cyclic shift of the center frequency of the frequency channel does not necessarily mean that the center frequency is always the effect shifted in the same order that, for example, from an output center frequency initially a shift to a positive value and then, for example, a shift is carried out to a negative value. So are fundamentally different in terms of the shift sequence of the center frequency also significantly complicated or to some extent random based algorithms conceivable, whereby, however, at all times ensure that the respective center frequency, which is used for data transfer, both the transmitting is also receiving end known or determinable, that is, that at any time there is a synchronization between the respective transmission means and the respective receiving device.

In a particularly preferred embodiment, the inventive method is designed such that a minimum distance of the frequency channel is adhered to adjacent frequency channels in the cyclic shift of the center frequency of the frequency channel. In principle, it is possible that a certain overlap is tolerated with adjacent frequency channels of the communication system on the shift of the center frequency of the frequency channel. As usual SHORT- a cyclic shift of the center frequency will be conducted also for the adjacent frequency channels associated with such deterioration overlap is limited. If, however, according to the aforementioned preferred development of the comparison according to the invention running at the cyclic shift of the center frequency of the frequency channel, a minimum distance of the frequency channel to adjacent frequency channels is maintained, corresponding impairments are advantageously completely avoided or at least significantly reduced. In addition, compliance with the minimum distance has the advantage that the method thus typically conform to existing standard specifications, such as IEEE 802.15.4, remains as one is not left in the standards commonly provided tolerance range.

Basically, the cyclic shift of the center frequency of the frequency channel in different ways can be made. Ultimately, this is merely to ensure that, for a data transmission between a transmitting device and a receiving device both subscribers or user terminals are both temporally synchronized in to be used in each cycle center frequency of the frequency channel used.

In a further preferred embodiment of the method according to the invention the transmission of the spread signal in the frequency channel in time slots, whereby the joint is shifted center frequency of the frequency channel for each of the time slots. This offers the advantage that the method for wireless data transmission in a communication system are already working frequently timeslot-based, to ensure synchronization of the subscribers of the communication system. Length and structure of the respective time slots are dependent upon the particular communication system and, optionally, on the intended type of application of the communication system. If necessary, already used time slots can be proceedings advantageously used in the procedure according to the invention to the effect of a shift in the center frequency of the frequency channel so that the center frequency of the frequency channel for each of the time slots will be moved, ie changes in each of the time slots.

Preferably, the inventive method can also be configured so that the cyclic shift of the center frequency of the frequency channel takes place, if a failure of the data transmission has been detected. Although it will be convenient, as a rule, that the cyclic shift of the center frequency of the frequency channel in general, that is independent of the actual transmission conditions. However, according to said preferred embodiment of the method according to the invention it is in principle also conceivable that the cyclic shift of the center frequency of the frequency quenzkanals occurred or is started after a data transfer failure has been detected. A similar disturbance of the data transmission can be detected, for example, by a coordination node of the communication system, or by any other

Participant of the communication system are detected and reported to the coordination node. In order to resolve the disturbance of the data transmission or at least reduce, it is the coordination node then possible to instruct the user of the communication system, that in the following is carried out a cyclic shift of the center frequency of the respective frequency channel or has to take place.

In principle, it may be used in which in the framework of the method according to the invention communication system is a communication system that a spread spectrum method in accordance with any standard or any specification uses. In a further particularly preferred embodiment of the inventive method is so pronounced that a communication system according to the IEEE standard 802.15.4 is used. This offers the advantage that communication systems according to the IEEE 802.15.4 are enjoying increasingly widespread, particularly in the field of industrial technology, that is increasingly found, for example in the field of automation technology, application. The inventive method provides a contribution to increase the robustness of a communication system according to the IEEE 802.15.4 standard so that a use even under critical conditions tables, such as in the field of control of industrial plants allows. it is also advantageous that bandwidth and channel spacing are specified in the IEEE 802.15.4 standard so that a shift of the center frequency of a frequency channel is possible in compliance with the specification.

Depending on the respective requirements as well as the respective bandwidth of the frequency channels used in the respective communication system, the cyclic shift of the center frequency to different values ​​can occur. It is decisive here only that the cyclic shift of the center frequency of the frequency channel does not exceed a fraction of the bandwidth of the frequency channel. In another particularly preferred embodiment of the method according to the invention, the center frequency of the frequency channel with a bandwidth of 2 MHz is cyclically shifted by 1 MHz. This is a Particularly simple algorithm to shift the center frequency, its use can be considered, for example for communication systems according to the IEEE 802.15.4 standard.

The present invention further relates to a transmitting device for wireless data transmission in a communication system, wherein the transmitting device is adapted to undergo a to be transmitted data signal of a band spreading and transmitting the spread signal in a frequency channel.

With regard to the transmitting device of the present invention has for its object to provide a transmitting device of the aforementioned type, which ren for wireless data transmission in a communication system supports a particularly insensitive to interference and at the same time powerful procedural.

This object is inventively achieved by a transmitter to undergo device for wireless data transmission in a communication system, wherein the transmitting device is adapted to an item to transfer data signal of a band spreading and transmitting the spread signal in a frequency channel, the center frequency of the is frequency channel cyclically shifted by a fraction of the bandwidth of the frequency channel.

The advantages of the transmitting device according to the invention essentially correspond to the aforementioned advantages of the method according to the invention, so that this connection to the corresponding foregoing reference is made. Analogously, the transmitting device according to the invention reference is made to the foregoing embodiments in conjunction with the corresponding preferred developments of the method according to the invention with regard to the below-mentioned preferred developments.

In a particularly preferred embodiment, the inventive transmission means for cyclically shifting the center frequency of the frequency channel in compliance with a minimum distance of the frequency channel is formed into adjacent frequency channels.

Preferably, the transmitting device according to the invention may also be configured such that the transmitting device to

Transmission of the spread signal is formed in the frequency channel in time slots and for shifting the center frequency of the frequency channel for each of the time slots.

The invention further relates to a receiving device for wireless data transmission in a communication system, wherein the receiving means is adapted to recover a data signal from a received spread signal in a frequency channel. With regard to the reception device of the present invention has for its object to provide a receiver device of the aforementioned type, which drive a particularly insensitive to interference and at the same time powerful encryption for wireless data transmission in a communication system supported.

This object is inventively achieved by a receiving device for wireless data transmission in a communication system, wherein the receiving means is adapted to recover a data signal from a received in a frequency channel spread signal, and wherein the receiving means for cyclically shifting the center frequency of is configured frequency channel by a fraction of the bandwidth of the frequency channel.

Regarding the benefits of receiving device of the invention and the preferred developments listed below of the receiving device according to the invention is again made their advantages mentioned above in connection with the process of the invention or the corresponding preferred embodiments of the inventive method.

Preferably, the receiving device according to the invention is designed such that the receiving means for cyclically shifting the center frequency of the frequency channel in compliance with a minimum distance of the frequency channel is formed into adjacent frequency channels.

In a further particularly preferred embodiment, the inventive receiver device for receiving the spread signal in the frequency channel in time slots and for shifting the center frequency of the frequency channel for each of the time slots is formed.

Preferably, the receiving device according to the invention may additionally be embodied as a transmitting device in accordance with the transmitting device according to the invention or one of the aforementioned preferred embodiments of the transmitting device according to the invention. This offers the advantage that an appropriate device for bidirectional data transmission, that is, both as transmitting and as a receiving device, can be used.

The invention further comprises a communication system for wireless data transmission with at least one inventive transmission device or at least one transmitting device according to one of the preferred developments described above, the transmitting device according to the invention as well as with at least one receiving device according to the invention or at least one receiving means according to one of the preferred embodiments of the receiving device described above according to the invention.

In a particularly preferred development of the inventive communication system for data transmission in accordance with the IEEE 802.15.4 standard is formed.

The invention is further illustrated with reference to embodiments. This is shown in the

Figure in a diagram a schematic representation of a taking place in the context of an exemplary embodiment of the method according to the invention shift of the center frequency of a frequency channel as a function of time. In the figure, frequency position and bandwidth of frequency channels 11 are illustrated to 26 f as a function of frequency, and the ordinate shows the time t, so that a temporal development can be seen. In the illustrated frequency quenzkanälen 11 to 26 may be, for example, around 16 under the IEEE 802.15.4 frequency channels defined in the region of the ISM band at 2.4 GHz.

The frequency channels 11 to 26 kön- shown in FIG nen in the context of a method of wireless, that is radio-based, data transmission can be used in a communication system each for itself for this to make a data transfer between a transmitting device and a receiving device. In this case, that a data signal to be transmitted is subjected prior to its transmission band spreading and the spread signal, that is, the data signal produced by the spread spectrum, is then transmitted in one of the frequency channels 11 to 26 is assumed. In the present embodiment, it is exemplarily assumed that the considered data transmission within the frequency channel 19 takes place. It should be noted, however, that the method described hereinafter, which will be explained on the recordable the frequency channel 19, will be applied generally also in the other frequency channels 11 to 18 and 20 to 26 of the communication system for wireless data transmission in an analogous manner.

As shown in the figure that the spread signal is transmitted in the frequency channel 19, the data transmission in frequency channel 19 takes place in such a way, the

is shifted by a fraction of the bandwidth of the frequency channel cyclically center frequency of the frequency channel 19th This is indicated by the hatched areas indicating respectively the center frequency and bandwidth used for one cycle of the frequency channel nineteenth To the extent that the considered communication system is a communication system according to the standard IEEE 802.15.4 would act, the frequency channels 11 would each have a bandwidth of 2 MHz and a channel spacing of 5 MHz to 26th This means that the center frequency of adjacent frequency channels in the frequency channels on the basis of 11 to 18 and 20 to 26 illustrated case that no shift of the center frequency takes place, have a spacing of 5 MHz. According to the illustration in connection with frequency channel 19, however, will now be given according to the invention cyclically shifting the center frequency of the frequency channel, wherein the shift does not exceed a fraction of the bandwidth of the frequency channel nineteenth In the described embodiment, this means that the amount of displacement with respect to a specified "normal value" of the center frequency at any time greater than 2 MHz, so that the center frequency by a maximum of ± 2 MHz fluctuates around its nominal value.

As shown in the figure, a minimum distance of the frequency channel 19 to the adjacent frequency channels 18 and 20 is preferably maintained in the cyclic shift of the center frequency of the frequency channel nineteenth However, this applies in particular to the case, which will be useful in the rule that the adjacent frequency channels perform a corresponding cyclic frequency shift of the center frequency, not mandatory. While it is conceivable that each of the algorithms used are synchronized such that in each time slot despite shift of the center frequencies of an overlap of the bandwidth of the frequency channels is 19, and 18 or 19 and 20 avoided; However, it is also conceivable that a corresponding overlap is tolerated as they will affect only certain time slots in the rule and the robustness of the data transmission is also increased by the already taking place band spreading of the transmitted data signal.

Characterized in that in addition to the band spreading of the transmitted data signals a shift of the center frequency of the frequency channel 19 is inserted, the Unerapfindlichkeit of data transmission against interferences is further increased. In this case, in principle, be similar or analogous to frequency hopping or channel hopping a corresponding cyclic shift of the center frequency of the frequency channel with respect to their realization and the algorithms used, as are known for example from the Bluetooth standard. In contrast, basic but not the frequency channels are changed, only the center frequency of the frequency channels 11 to 26 are each shifted, for example, steps of a width of 1 MHz or adjusted. Due to this relatively minor shifts ensured is assumed that the tolerance of the relevant specification, ie in the present case of the IEEE 802.15.4, is not left. On the other hand from the shift of the center frequency of the frequency channel is sufficient but advantageously usually for sufficiently compensate for a frequency-induced attenuation dead zones, ie to reduce interference in data transmission or their effects. Advantageously, therefore according to the invention a deterioration of the other frequency channels 11 to 18 and 20 to 26, whether for this also a corresponding center frequency shift is performed or not, is avoided, at the same time the above-mentioned fading effects is counteracted. In accordance with the foregoing, the method can in principle be used for communication systems any standards, and for any application. is particularly advantageous in an application in the field of industrial automation, ie in particular for communications systems, whose participants include sensors and actuators.

In principle, the inventive method is customarily as permanently and independently of the actual transmission conditions are used. However, it is also conceivable that the cyclic shift of the center frequency of the frequency channel only takes place when a failure of the data transmission has been detected. This includes, on the one hand, the case that in such a case only for the relevant frequency channel takes place a cyclic shift of the center frequency. In addition, however, it is also conceivable that in the event of, for example, frequency channel 19 is switched particular failure of the data transmission either for this one frequency channel 19 or for all frequency channels 11 to 26 of the communication system to a method of in which a cyclic shift of the center frequency of the frequency channel 19 and the center frequencies of all the frequency channels is 11 to 26.

The process described above can of subscriber devices of the communication system, that is advantageously realized by transmitting and / or receiving devices in a comparatively simple manner. The resources required in the form of hardware and / or software can be realized. Thus, it is conceivable, for example, that a radio transceiver of a user equipment is configured and controlled by a computing unit such that the radio transceiver is also communicated to the establishment, shift of the center frequency of the frequency channel adjacent to the frequency to be used channel or approximately passed as a parameter.

According to the foregoing method as well as the inventive method according to the invention realized transmission devices, receiving devices, and communication systems are particularly advantageous in that, while maintaining the bandwidth of the respective frequency channels, and while largely avoiding an interference with adjacent frequency channels, the robustness of the data transmission in communication systems, the apply a spread spectrum, is improved.

Claims

claims
1. A method for wireless data transmission in a communication nikationssystem, wherein an item to transfer data signal of a band spreading subjected and the spread signal is transmitted in a frequency channel (19), characterized in that the center frequency of the frequency channel (19) cyclically of a fraction of the bandwidth frequency channel (19) is moved.
2. The method of claim 1, characterized in that when the cyclic shift of the center frequency of the frequency channel (19) a minimum distance of the frequency channel (19) to adjacent frequency channels (11-18, 20-26) is maintained.
3. The method of claim 1 or 2, characterized in that the transmission of the spread signal in the frequency channel (19) is effected in time slots, wherein the center frequency of the frequency channel (19) for each of the time slots is displaced.
4. The method according to any one of the preceding claims, characterized in that the cyclic shift of the center frequency of the frequency channel (19) takes place, if a failure of the data transmission has been detected.
5. The method according to any one of the preceding claims, characterized in that a communication system according to the standard IEEE 802.15.4 is used.
6. The method according to any one of the preceding claims, characterized in that the center frequency of the frequency channel (19) is shifted by 1 MHz cyclically at a bandwidth of 2 MHz.
subjecting 7. transmitting device for wireless data transmission in a communication system, wherein the transmitting device is adapted to an item to transfer data signal of a Bandsprei- wetting and transmitting the spread signal in a frequency channel (19), characterized in that the transmitting means for cyclically shifting the center frequency of the frequency channel (19) is formed by a fraction of the bandwidth of the frequency channel (19).
8. transmitting device according to claim 7, characterized in that the transmission means for cyclically shifting the center frequency of the frequency channel (19) while maintaining a minimum distance of the frequency channel (19) to adjacent frequency channels (11-18, 20-26) formed is.
9. transmitting device according to claim 7 or 8, characterized in that the transmission means for transmitting the spread signal in the frequency channel (19) ben in time slots and the displacement of the center frequency of the frequency channel (19) is formed for each of the time slots.
NEN 10. reception device for wireless data transmission in a communication system, wherein the receiving device is designed to received from an in one frequency channel (19) spread signal zurückzugewin- a data signal, characterized in that the receiving means for cyclically shifting the center frequency the frequency channel (19) is formed by a fraction of the bandwidth of the frequency channel (19).
11. Reception device according to claim 10, characterized in that the receiving means for cyclically shifting the center frequency of the co-frequency channel (19) while maintaining a minimum distance of the frequency channel (19) to adjacent frequency channels (11-18, 20-26) formed is.
12. Reception device according to claim 10 or 11, characterized in that the receiving means for receiving the spread signal in the frequency channel (19) is constructed in time slots and for shifting the center frequency of the frequency channel (19) for each of the time slots.
13. Reception device according to one of claims 10 to 12, characterized in that the receiving device is additionally constructed as a transmitting device according to one of claims 7 to 9.
14. A communication system for wireless data transmission with at least one transmitting device according to any one of claims 7 to 9 and at least one receiving device according to any one of claims 10 to. 13
15. Communication system according to claim 14, characterized in that the communication system is designed for data transmission according to the IEEE 802.15.4 standard.
PCT/EP2008/010880 2008-12-15 2008-12-15 Method, transmission device, receiving device and communication system for wireless data transmission WO2010069351A1 (en)

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PCT/EP2008/010880 WO2010069351A1 (en) 2008-12-15 2008-12-15 Method, transmission device, receiving device and communication system for wireless data transmission

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09294092A (en) * 1996-04-24 1997-11-11 Brother Ind Ltd Spread spectrum multiplex communication system and communication equipment using the communication system
US5751703A (en) * 1995-05-11 1998-05-12 Kokusai Denshin Denwa Co., Ltd. Energy dispersal method for TDMA carrier
WO2007104008A2 (en) * 2006-03-09 2007-09-13 Spinwave Systems, Inc. Reducing interference in a hierarchical wireless sensor network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5751703A (en) * 1995-05-11 1998-05-12 Kokusai Denshin Denwa Co., Ltd. Energy dispersal method for TDMA carrier
JPH09294092A (en) * 1996-04-24 1997-11-11 Brother Ind Ltd Spread spectrum multiplex communication system and communication equipment using the communication system
WO2007104008A2 (en) * 2006-03-09 2007-09-13 Spinwave Systems, Inc. Reducing interference in a hierarchical wireless sensor network

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BAO ZHIYUN ET AL: "A New Auto-adapt Centre Frequency of SSC Signals RF Method for Power line Communication under Strong Noise Background", TRANSMISSION AND DISTRIBUTION CONFERENCE AND EXHIBITION: ASIA AND PACI FIC, 2005 IEEE/PES DALIAN, CHINA 15-18 AUG. 2005, PISCATAWAY, NJ, USA,IEEE, 1 January 2005 (2005-01-01), pages 1 - 4, XP031034757, ISBN: 978-0-7803-9114-7 *
KALYAN PATHAPATI SUBBU ET AL: "Empirical study of IEEE 802.15.4 mutual interference issues", SOUTHEASTCON, 2007. IEEE, IEEE, PI, 1 March 2007 (2007-03-01), pages 191 - 195, XP031072761, ISBN: 978-1-4244-1028-6 *

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