CN100446459C - Method and apparatus for wide bandwidth mixed-mode wireless communications - Google Patents
Method and apparatus for wide bandwidth mixed-mode wireless communications Download PDFInfo
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- CN100446459C CN100446459C CNB2005100856770A CN200510085677A CN100446459C CN 100446459 C CN100446459 C CN 100446459C CN B2005100856770 A CNB2005100856770 A CN B2005100856770A CN 200510085677 A CN200510085677 A CN 200510085677A CN 100446459 C CN100446459 C CN 100446459C
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Abstract
The invention discloses a network device for realizing a greenfield transmission in a hybrid frame structure. The network device is configured to transfer a hybrid frame between two adjacent channels. The hybrid frame comprises at least two backward compatible portions of a first frequency and a greenfield portion of a second frequency. The invention further discloses a network device for receiving a greenfield transmission in a hybrid frame structure. The network device comprises a wave detector for detecting either two parallel transmissions of a first frequency or a greenfield transmission of a second frequency. Additionally, the invention also discloses a method for transmitting a greenfield transmission in a hybrid frame structure.
Description
Technical field
The present invention relates generally to wireless communication system, relates more specifically to a kind of by realizing the system that mixed wireless is communicated by letter with the back compatible system forward.
Background technology
Wireless communication system can be realized various dissimilar communications.A kind of radio communication that is used between single reflector and the single receiver is called as single single input of output (SISO) communication.This reflector comprises an antenna that is used for launching the radiofrequency signal of the one or more antennas receptions that are received device.When this receiver comprised two or more antennas, receiver selected one of them antenna to receive the radiofrequency signal of input.Another radio communication is multiple-input and multiple-output (MIMO) communication.In mimo wireless communication, each reflector and receiver comprise a plurality of paths.In such communication, reflector usage space and time encoding function generate two or more data flow with the parallel processing data.This reflector comprises a plurality of emission paths, converts each data flow to the multi-channel rf signal.This receiver receives the multi-channel rf signals by a plurality of reception paths, usage space and time encoding function this data flow of reentrying.Then the data flow of reentrying is merged, handle subsequently to return to initial data.
Different radio device in a wireless communication system may be deferred to different standards or uniform different editions.For example, IEEE
TM802.12a, be IEEE
TM802.11 the expansion of standard provides nearly 54Mbps in the frequency range of 5GHz.IEEE
TM802.12c, be that another of 802.11 standards expands, the transmission (during fallback be 5.5,2 and 1Mbps) of 11Mbps is provided in the frequency range of 2.4GHz.IEEE
TM802.11g, be another expansion of 802.11 standards, in the frequency range of 2.4GHz, provide 20+Mbps.IEEE
TM802.11n, be 802.11 new expansion, just be studied with solving higher throughput and compatible problem.A communication equipment of deferring to 802.12a may be present among the same WLAN with an equipment of deferring to other 802.11 standards.When the equipment of a plurality of versions of deferring to 802.11 standards is in same WLAN, the equipment of deferring to than legacy version will be considered to retrospective installation.In order to ensure with the back compatible of retrospective installation, must adopt special mechanism to guarantee that this retrospective installation can be known when an equipment of deferring to the renewal version of standard is using a wireless channel, to avoid conflict.The new implementation of wireless communication protocol can be realized throughput more at a high speed, and the retrospective installation that may only defer to 802.12a or 802.11g is communicated by letter in the system with the more speed operation.
In order to solve this consistency problem, present communication system is supported the mixed mode frame of two or more transmitting antennas.This mixed mode frame comprises the information that can be utilized by retrospective installation, and at the customizing messages of non-retrospective installation.Especially, this mixed mode frame comprises a preamble, and this preamble comprises a back compatible part (backward compatible portion) and a greenery patches part (greenfieldportion).Retrospective installation uses this back compatible part to determine need how long leave channel because of the transmission of greenery patches part, and but the transmission of this greenery patches part is ignored by retrospective installation used by non-retrospective installation.
Yet, still have a kind of needs, when sending packet or frame to equipment with higher speed, can with the retrospective installation compatibility.
Summary of the invention
According to an aspect of the present invention, provide a kind of network equipment of realizing the transmission of high speed greenery patches with the mixed mode frame structure.The described network equipment is configured to transmit a mixed mode frame on two adjacent channels.Described mixed mode frame comprises at least two back compatible part of first frequency and a greenery patches part of second frequency.
According to another aspect of the present invention, provide a kind of network equipment that receives the transmission of high speed greenery patches with the mixed mode frame structure.The described network equipment comprises a wave detector, is used for detecting in the greenery patches transmission of the parallel transmission of two first frequencies and a second frequency at least one.
According to another aspect of the present invention, provide a kind of network equipment with the greenery patches transmission of mixed mode frame structure emission high speed.The described network equipment comprises a back compatible part generator, is used to generate the back compatible part of a plurality of first frequencies, and provides the combination of a length and speed so that retrospective installation leaves channel in during the transmission of greenery patches part.The described network equipment also comprises a greenery patches part generator, be used to generate the greenery patches part of second frequency, a virtual length and virtual speed are passed to described back compatible part generator, and indicate described back compatible part generator that the combination of described length and speed is provided, thereby guarantee the back compatible with retrospective installation.The described network equipment further comprises the device of the output multiplexing of described back compatible part generator and greenery patches part generator being given the corresponding sign map table of a plurality of transmitting antennas of a plurality of and described equipment.The described network equipment also comprises a plurality of processing modules, be used for handling described mixed mode frame, and on two adjacent channels, transmitting the described mixed mode frame that can independently be received by old-fashioned work station, wherein said mixed mode frame comprises the mixed mode back compatible part of two first frequencies and the greenery patches part of a second frequency.
According to a further aspect in the invention, provide a kind of method with the greenery patches transmission of mixed mode frame structure emission high speed.Described method comprises back compatible part that produces a plurality of first frequencies and the step that produces the greenery patches part of a second frequency.Described method also comprises a virtual length and virtual speed passes to the back compatible part generator and indicate described back compatible part generator that the step of length and speed combination is provided.Described method further comprises provides the combination of described length and speed so that retrospective installation leaves channel between the transmission period of greenery patches, and will described a plurality of back compatible part and the described greenery patches part multiplexing step of giving the corresponding sign map table of a plurality of transmitting antennas in a plurality of and the equipment.Described method also is included on two adjacent channels the step of the mixed mode frame that emission can independently receive by old-fashioned work station.Described frame comprises the back compatible part of two first frequencies and the greenery patches part of a second frequency.
According to a further aspect in the invention, provide a kind of equipment with the greenery patches transmission of mixed mode frame structure emission high speed.Described equipment comprises with first generating means of the back compatible part that generates a plurality of first frequencies with second generating means of the greenery patches part that generates a second frequency.Described equipment also comprises a virtual length and virtual speed passes to described first generating means and indicate described first generating means that the transfer device of one length and speed combination is provided.Described equipment further comprises provides the combination of described length and speed so that retrospective installation leaves the generator of channel between the transmission period of greenery patches, and will described a plurality of back compatible part and the part multiplexing of described greenery patches give the multiplexing unit of the corresponding sign map table of a plurality of transmitting antennas in a plurality of and the equipment.Described equipment also is included on two adjacent channels the emitter of the mixed mode frame that emission can independently receive by old-fashioned work station, and wherein said mixed mode frame comprises the back compatible part of two first frequencies and the greenery patches part of a second frequency.
According to an aspect of the present invention, provide a kind of and realize the network equipment that transmit in the high speed greenery patches with the mixed mode frame structure, the described network equipment is configured to:
Be sent to few mixed mode frame on two adjacent channels, wherein said mixed mode frame comprises the back compatible part of at least two first frequencies and the greenery patches part of a second frequency.
Preferably, described two adjacent channels are the 20MHz channels that can independently be received by the old-fashioned work station of 20MHz.
Preferably, the copy of 20MHz back compatible part transmits in each of described two adjacent channels.
Preferably, each in described two back compatible part all is the 20MHz back compatible part, and described greenery patches part is the 40MHz greenery patches part that comprises preamble information and data.
Preferably, one in described two adjacent channels is the 4n+K channel, and another in described two adjacent channels is 4 (n+1)+K channels, and wherein n represents the quantity of the transmitting antenna in the described network equipment, and K is 0 to 3 integer.
Preferably, except that 5745MHz to 5825MHz, k equals 0 in all frequencies, when a frequency more than or equal to 5745MHz, and when being less than or equal to 5805MHz, k equals 1.
Preferably, the described network equipment comprises that further a usefulness generates the signal generating circuit of the number of sub certificate on described two adjacent channels, the subcarrier that wherein is used for described two back compatible part concentrates in the range of channels of 20MHz, and the subcarrier that is used for described greenery patches part is the twice of frequency range that is used for the subcarrier of described back compatible part.
Preferably, different information is transmitted on the upper curtate of the subcarrier that described greenery patches part is used and lower curtate.
Preferably, the once conversion from described back compatible part to described greenery patches part on the channel of plane, the increment of power is less than 0.65dB.
Preferably, the greenery patches part on described two adjacent channels is separated by 9.0625MHz, and a zero subcarrier is eliminated or is skipped.
According to an aspect of the present invention, provide a kind of and receive the network equipment that transmit in the high speed greenery patches with the mixed mode frame structure, the described network equipment comprises:
Be used for detecting at least one wave detector of the greenery patches transmission of the parallel transmission of two first frequencies and a second frequency.
Preferably, a signal field in the back compatible part of the mixed mode frame that receives on two adjacent channels is used for determining how long need leave described channel so that carry out the transmission of described greenery patches part by the old-fashioned work station on described two adjacent channels.
According to an aspect of the present invention, a kind of network equipment that carries out the transmission of high speed greenery patches with the mixed mode frame structure is provided, wherein, the described network equipment adopts the OFDM encoding scheme, but the transmission of described greenery patches is meant by retrospective installation to be ignored the employed transmission of the described network equipment, and the described network equipment comprises:
The back compatible part generator generates the back compatible part of a plurality of first frequencies, and provides length and speed combination so that retrospective installation leaves channel between the transmission period of greenery patches;
Greenery patches part generator, generate the greenery patches part of a second frequency, a virtual length and virtual speed are passed to described back compatible part generator, and indicate described back compatible part generator that the combination of described length and speed is provided, thereby guarantee back compatible with retrospective installation;
Multiplexing unit, give a plurality of sign map tables with the output multiplexing of described back compatible part generator and described greenery patches part generator, wherein said a plurality of sign map table is corresponding with a plurality of transmitting antennas in the described network equipment, is used for generating symbol at each subcarrier of OFDM sequence from bits of coded;
A plurality of processing modules, be used for handling the mixed mode frame, and on two adjacent channels that can independently be received, transmitting described mixed mode frame by retrospective installation, wherein said mixed mode frame comprises the back compatible part of at least two first frequencies and the greenery patches part of a second frequency.
Preferably, described a plurality of processing module comprises:
Subcarrier is converted to a plurality of reverse fast Fourier conversion of time domain from frequency domain;
Filtering is from a plurality of digital filter of the signal of described a plurality of reverse fourier transform;
To become a plurality of digital to analog converters of analog signal from the conversion of signals of a plurality of digital filters.
Preferably, each described reverse fast Fourier conversion all is 128 reverse fast Fourier conversions.
Preferably, described two adjacent channels are the 20MHz channels that can independently be received by the retrospective installation of 20MHz.
Preferably, the copy of 20MHz back compatible part transmits in each of described two adjacent channels.
Preferably, each in described two back compatible part all is the 20MHz back compatible part, and described greenery patches part is the 40MHz greenery patches part that comprises preamble information and data.
According to an aspect of the present invention, a kind of method of being carried out the transmission of high speed greenery patches by the network equipment with the mixed mode frame structure is provided, wherein, the described network equipment adopts the OFDM encoding scheme, the transmission of described greenery patches is meant to be ignored by retrospective installation but by the employed transmission of the described network equipment, described method comprises the steps:
Generate the back compatible part of a plurality of first frequencies;
Generate the greenery patches part of a second frequency;
A virtual length and virtual speed are passed to the back compatible part generator of the back compatible part that generates described a plurality of first frequencies, and indicate described back compatible part generator that length and speed combination are provided;
Provide the combination of described length and speed so that retrospective installation leaves channel between the transmission period of greenery patches;
Give a plurality of sign map tables with described a plurality of back compatible part and the part multiplexing of described greenery patches, wherein said a plurality of sign map table is corresponding with a plurality of transmitting antennas in the equipment, is used for generating symbol at each subcarrier of OFDM sequence from bits of coded;
Transmit the mixed mode frame on two adjacent channels that can independently be received by retrospective installation, wherein said mixed mode frame comprises the back compatible part of at least two first frequencies and the greenery patches part of a second frequency.
According to an aspect of the present invention, provide a kind of and transmit the equipment of high speed greenery patches transmission with the mixed mode frame structure, described equipment comprises:
Be used to generate first generating means of the back compatible part of a plurality of first frequencies;
Be used to generate second generating means of the greenery patches part of a second frequency;
A virtual length and virtual speed are passed to described first generator and indicate described first generator that the transfer device of length and speed combination is provided;
Provide the combination of described length and speed so that retrospective installation leaves the generator of channel between the transmission period of greenery patches;
Described a plurality of back compatible part and the part multiplexing of described greenery patches are given the multiplexing unit of the corresponding sign map table of a plurality of transmitting antennas in a plurality of and the equipment;
The emitter of the mixed mode frame that emission can independently be received by old-fashioned work station on two adjacent channels, wherein said mixed mode frame comprises the back compatible part of two first frequencies and the greenery patches part of a second frequency.
Description of drawings
The following drawings provides further understanding of the present invention, constitutes the part of this specification, explains each embodiment of the present invention, and explains principle of the present invention with specification, wherein:
Fig. 1 is the schematic diagram of the communication system 10 of one embodiment of the invention;
Fig. 2 a is the schematic diagram that is used for the 20MHz mixed mode frame of two transmitting antennas;
Fig. 2 b is the schematic diagram that is used for the 20MHz mixed mode frame of three transmitting antennas;
Fig. 2 c is the schematic diagram that is used for the 20MHz mixed mode frame of four transmitting antennas;
Fig. 3 is the structural representation of the 40MHz mixed mode frame of one embodiment of the invention;
Fig. 4 is the schematic diagram of sub-carrier mapped in the system of one embodiment of the invention;
Fig. 5 is a block diagram that is used for transmitting the equipment of 40MHz mixed mode frame.
Embodiment
Hereinafter with reference to embodiment and accompanying drawing the present invention is made a detailed description.
Shown in Figure 1 is communication system 10, comprises a plurality of base stations and/or access point 12-16, a plurality of Wireless Telecom Equipment 18-32, and a network hardware equipment 34.Wireless Telecom Equipment 18-32 is kneetop computer 18 and 26, personal digital assistant main frame 20 and 30, PC 24 and 32 and/or mobile phone 22 and 28.Base station or access point 12-16 connect 36,38 and 40 by local area network (LAN) and may be operably coupled to the network hardware 34.The network hardware 34, for example router, switch, bridger, modulation adjuster or system controller connect for communication system 10 provides Wide Area Network.Each base station or access point 12-16 have attached antenna or aerial array, with its coverage in Wireless Telecom Equipment communicate.In general, this Wireless Telecom Equipment needs to a certain base station or access point 12-14 registration, to receive service from communication system 10.Each Wireless Telecom Equipment comprises that a built-in radio device or the radio device related with connect.This radio device comprises at least one radiofrequency launcher and at least one radio frequency receiver.
The radio communication equipment of each participation radio communication comprises a built-in radio transceiver (just receiver and reflector) or is connected with a related radio transceiver.As well known for one of skill in the art, described reflector generally comprises a data modulating stage, one or more intermediater-frequency stage and a power amplifier.Described data-modulated level converts initial data to baseband signal according to specific wireless communication standard.Described intermediater-frequency stage mixes described baseband signal to produce radiofrequency signal with one or more local oscillations.Described power amplifier amplifies described radiofrequency signal before passing through the antenna transmission signal.
Described receiver generally is connected with antenna, comprises a low noise amplifier, one or more intermediater-frequency stage, a filtering stage and a data recovery level.Described low noise amplifier is by antenna reception of inbound radiofrequency signal and amplify this inbound radiofrequency signal.Described intermediater-frequency stage should be amplified radiofrequency signal and mixed with one or more local oscillations, converted baseband signal or intermediate-freuqncy signal to should amplify radiofrequency signal.Described filtering stage is carried out filtering to this baseband signal or intermediate-freuqncy signal, and unwanted signal is decayed this baseband signal to generate filtering signal.Described data are recovered level and are recovered initial data according to specific wireless communication standard from this filtering signal.
Communication system is supported the mixed mode frame on two or more transmitting antennas, to solve the consistency problem of old-fashioned and non-legacy system.Have in the communication system of mixed mode frame of back compatible part and greenery patches part at tenaculum, medium access (MAC) mechanism can be used to notify retrospective installation to leave this channel in the process of greenery patches part transmission.But retrospective installation can't be seen this MAC information.Therefore, in the transport process of mixed mode frame, preferably protect the transmission of this greenery patches part with the physical layer protection scheme.In this way, even retrospective installation is not seen this MAC information, hybrid front-synchronous code also can provide necessary indication for this retrospective installation.
Fig. 2 a-2c shows the schematic diagram that is used for the 20MHz mixed mode frame of a plurality of transmitting antennas in MIMO communication separately.It shown in Fig. 2 a the 20MHz mixed mode frame that is used for two transmitting antennas; It shown in Fig. 2 b the 20MHz mixed mode frame that is used for three transmitting antennas; It shown in Fig. 2 c the 20MHz mixed mode frame that is used for four transmitting antennas.According to Fig. 2 a-2c, back compatible part 102 comprises a short symbol 104/114/134/154, then is thereafter 106/116/136/157, one long training sequence 108/118/138/158 of a guard interval and a predefine signal domain 110/120/140/160.Greenery patches part 122 comprises one or more long training sequences 111/124/144/164 and 117/128/148/168, one guard interval 121/123/141/161 and a signal domain 113/126/146/166.In Fig. 2 b and 2c, back compatible part 102 comprises guard interval 115/119/139/162, and the greenery patches part 122 among Fig. 2 a comprises guard interval 115/125.
On first reflector 101 in Fig. 2 a-2c, preamble is launched in the mode identical with transmission on 802.12a/802.11g.On second reflector 112, Short Training symbol 114 is launched with the cyclic shift of 400ns, and long training sequence 118 is launched with the cyclic shift of 100ns, and signal domain 120 is launched with the cyclic shift of 100ns.Guard interval 116 does not have cyclic shift when being launched, the cyclic shift when guard interval 119 is launched is 2.In greenery patches part 122, long training sequence 124/128 and signal domain 126 are with the cyclic shift emission of 1600ns.Cyclic shift was 2 when guard interval 123 was launched.According to Fig. 2 a-2c, on the 3rd transmitting antenna 130, Short Training symbol 134 is launched with the cyclic shift of 400ns, and long training sequence 136 is launched with the cyclic shift of 100ns, and signal domain 140 is launched with the cyclic shift of 100ns.Cyclic shift was 1 when guard interval 138 and 139 was launched.In greenery patches part 122, long training sequence 144/148 and signal domain 146 are launched with the cyclic shift of 100ns.The cyclic shift that guard interval 141 is launched is 1.According to Fig. 2 c, on the 4th transmitting antenna 152, Short Training symbol 154 is launched with the cyclic shift of 400ns, and long training sequence 158 and signal domain 160 are launched with the cyclic shift of 200ns.The cyclic shift that guard interval 157 is launched is 2, and the cyclic shift that guard interval 162 is launched is 1.In greenery patches part 122, long training sequence 164/168 and signal domain 166 are launched with the cyclic shift of 1700ns.The cyclic shift that guard interval 161 is launched is 4.
In any explanation to Fig. 2 a to 2c, when retrospective installation receives described back compatible part, it utilizes the Short Training symbol to detect frame, utilizes long training sequence to train equalizer, utilizes signal domain how long to determine leave channel so that the transmission of greenery patches part.
The invention provides a kind of method, and can continue to be suitable for retrospective installation simultaneously with the speed transmission greenery patches information higher than the 20MHz of current use.Particularly, the invention provides a kind of 40MHz mixed mode frame structure that is used for greenery patches 40MHz transmission.
Fig. 3 is the structural representation of 40MHz mixed mode frame in the one embodiment of the invention.In this embodiment, wireless communication system of the present invention uses and can be launched the 40Mhz frame simultaneously by adjacent 20Mhz channel 306 and 308 by two that the 20Mhz retrospective installation independently receives.40Mhz frame structure shown in Fig. 3 can be used for 5Ghz or 2.4GHz.Known as those skilled in the art, as IEEE
802.12b and in the standard such as 802.11g, the wide 5MHz of channel is even signal exceeds outside the 5MHz.In this embodiment, channel 306 is represented the 4n+k channel, channel 308 is represented 4 (n+1)+k channels, wherein n is the quantity of transmitting antenna, k is from 0 to 3 arbitrary integer, but generally equal 0, equal 1 for the frequency k between 5745MHz and the 5805MHz for all the frequency k except that 5745MHz to 5825MHz.In IEEE 802.12a standard, channel is wide also to be 5MHz; But, it should be noted that in 802.12a, to have certain bound.Among this embodiment, channel 306 is represented channel n, and channel 308 is represented channel n+4.Therefore, the mixed mode frame structure shown in Fig. 3 can be used in 802.12b, 802.11g and the 802.12a communication environment.The mapping of time limit of the present invention and antenna can be with 20MHz mixed mode frame format identical.
In Fig. 3, this frame comprises two 20MHz hybrid front-synchronous code 302a/302b and a 40MHz greenery patches part 304.The copy of same 20MHz back compatible part transmits on channel 306 and 308.40MHz greenery patches part 304 comprises preamble information and data.As well known for one of skill in the art, greenery patches part 304 only needs to be received by non-retrospective installation.In greenery patches part 304, can realize having the high rate data transmission of better frequency diversity.It should be noted that greenery patches part 340 needn't with by 2 and 10MHz two greenery patches 20MHz transmission of separating identical.
When the receiver on channel 306 and 308 received the 40MHz frame, this receiver utilized the signal domain in the back compatible part 302a and 3021b in the hybrid 40MHz preamble to determine need leave because of the transmission of greenery patches part 304 time of this channel.Particularly, referring to Fig. 2 a-2c, length that signal domain 110/112/140/160 usefulness is virtual and rate domain are encoded to the frame duration of reality.Being converted to retrospective installation also can decode channel 306 or 308 interior signal domain.This greenery patches 40MHz begins after being transmitted in signal domain 110/112/140/160 and long training burst.
Shown in Figure 4 is sub-carrier mapped 402 in the wireless communication system of the present invention and 404 schematic diagram.The equipment that can realize 802.12a and 802.11g standard has used OFDM (OFDM) encoding scheme.OFDM is a kind of frequency division multiplexing modulation technique by a large amount of numerical datas of radio wave transmission.OFDM comes work by transmit individual traffic on one section subcarrier of parallel emission.In the equipment of deferring to 802.12a and 802.11g, have only 52 to be used in 64 effective subcarriers.There are four to be pilot subcarrier in this effective subcarrier, are used as the reference of ignoring the frequency or the phase-shifts of signal in the transmission course by system.48 remaining subcarriers provide independent radio path, send information with parallel mode.These 52 subcarriers can utilize binary or Quadrature Phase Shift Keying (BPSK/QPSK), 16 quadrature amplitude modulation (QAM) or 64QAM to modulate.Therefore, the equipment of deferring to 802.12a and 802.11g uses label to be-26 to+26 subcarrier, and label is that 0 subcarrier is set to 0, and label is that 0 subcarrier is a carrier frequency.
Because the present invention uses biobelt wide, Fig. 4 shows-64 to+63 subcarrier.The carrier wave of-58 to-6 and 6 to 58 in the mapping 402 all is described 52 subcarriers that are used in the 802.12a/802.11g equipment.This subcarrier accurately concentrates in the 20MHz channel boundary, so just all can be received by old-fashioned 802.12a/802.11g work station.As above mentioned, the copy of same 20MHz back compatible part is sent out on channel 306 and 308.Greenery patches part sub-carrier mapped 404 shows the information of subcarrier-58 on-3 and 3 to 58.But, extra pilot signal also can be set at subcarrier-2 ,-1 ,+1 and+2 on.In the present invention, increasing from back compatible part power to the process of greenery patches part conversion on the channel of plane, its increment is less than 0.65dB.In order to reduce the increase of power, the subcarrier-6 of mixed partial and+can fill nearly 4 virtual subcarriers that do not carry any information between 6.Because these extra subcarriers use 128 identical inverse fast fourier transforms conversions to encode, the subcarrier quadrature of they and other and the subcarrier that does not influence other are decoded by old-fashioned receiver.It should be noted that greenery patches part on the channel 306 and 308 304 is separated by 9.0625MHz, and zero (DC) subcarrier is removed/skipped.Different information is transmitted on the upper curtate of the output of a subcarrier and a digital multiplexer and lower curtate.Nearly 4 extra pilot signals are inserted near the zero subcarrier, follow the tracks of so that carry out phase at the receiver place.
40MHz receiver in the non-old-fashioned work station needs a wave detector, to detect two old-fashioned transmission of parallel 20MHz or a greenery patches 40MHz transmission.This wave detector is compared with the function such as the higher level code function of other expection, and complexity is less.
Shown in Figure 5 is the block diagram that is used to transmit the equipment of 40MHz frame.System 500 comprises a greenery patches part generator 502, a back compatible part generator 504, a plurality of sign map tables 506, a plurality of 128 inverse fast fourier transformed (IFFT) module 508, a plurality of digital filters 510, and digital to analog converter (D/A) 512.Data bit input greenery patches part generator 502, greenery patches part generator 502 passes to back compatible part generator 504 with a virtual length and virtual speed, and indicate back compatible part generator 504 that length and speed combination are provided, so that retrospective installation leaves channel between this greenery patches part transmission period.The signal code that back compatible part generator 504 uses in this back compatible part is utilized this virtual length and speed that the actual frame duration is encoded, and is made other 802.11 equipment of back compatible of the present invention.Generator 502 and each output of 504 all by multiplexing give with equipment 500 in the corresponding sign map of number of transmission antennas table 506.Each sign map table 506 generates symbol at each subcarrier of OFDM sequence from bits of coded.Each inverse Fourier transform 508 converts subcarrier to time-domain from frequency domain.This signal is by 510 filtering of digital filter module subsequently, and converts analog signal to through digital to analog converter 512.This analog signal can send transmitting antenna 1 to N by module 514.
Those skilled in the art as can be known, though the present invention has only introduced the embodiment about IEEETM802.11a and 802.11g, method of the present invention can be applicable in the equipment of any execution OFDM encoding scheme.More than be description, but clearly, can make other variation and modification, still can obtain the some or all of advantage of this embodiment described embodiment to the specific embodiment of the invention.Therefore, the purpose of dependent claims is variation and the modification that covers in all these true spirits of the present invention and the scope.
Claims (5)
1, a kind of network equipment that carries out the transmission of high speed greenery patches with the mixed mode frame structure, wherein, the described network equipment adopts the OFDM encoding scheme, the transmission of described greenery patches is meant by retrospective installation to be ignored still by the employed transmission of the described network equipment, it is characterized in that the described network equipment comprises:
The back compatible part generator generates the back compatible part of a plurality of first frequencies, and provides length and speed combination so that retrospective installation leaves channel between the transmission period of greenery patches;
Greenery patches part generator, generate the greenery patches part of a second frequency, a virtual length and virtual speed are passed to described back compatible part generator, and indicate described back compatible part generator that the combination of described length and speed is provided, thereby guarantee back compatible with retrospective installation;
Multiplexing unit, give a plurality of sign map tables with the output multiplexing of described back compatible part generator and described greenery patches part generator, wherein said a plurality of sign map table is corresponding with a plurality of transmitting antennas in the described network equipment, is used for generating symbol at each subcarrier of OFDM sequence from bits of coded;
A plurality of processing modules, be used for handling the mixed mode frame, and on two adjacent channels that can independently be received, transmitting described mixed mode frame by retrospective installation, wherein said mixed mode frame comprises the back compatible part of at least two first frequencies and the greenery patches part of a second frequency.
2, the network equipment according to claim 1 is characterized in that, described two adjacent channels are the 20MHz channels that can independently be received by the retrospective installation of 20MHz.
3, the network equipment according to claim 1 is characterized in that, the copy of 20MHz back compatible part transmits in each of described two adjacent channels.
4, the network equipment according to claim 1 is characterized in that, each in described two back compatible part all is the 20MHz back compatible part, and described greenery patches part is the 40MHz greenery patches part that comprises preamble information and data.
5, a kind of method of carrying out the transmission of high speed greenery patches by the network equipment with the mixed mode frame structure, wherein, the described network equipment adopts the OFDM encoding scheme, the transmission of described greenery patches is meant by retrospective installation to be ignored still by the employed transmission of the described network equipment, it is characterized in that described method comprises the steps:
Generate the back compatible part of a plurality of first frequencies;
Generate the greenery patches part of a second frequency;
A virtual length and virtual speed are passed to the back compatible part generator of the back compatible part that generates described a plurality of first frequencies, and indicate described back compatible part generator that length and speed combination are provided;
Provide the combination of described length and speed so that retrospective installation leaves channel between the transmission period of greenery patches;
Give a plurality of sign map tables with described a plurality of back compatible part and the part multiplexing of described greenery patches, wherein said a plurality of sign map table is corresponding with a plurality of transmitting antennas in the described network equipment, is used for generating symbol at each subcarrier of OFDM sequence from bits of coded;
Transmit the mixed mode frame on two adjacent channels that can independently be received by retrospective installation, wherein said mixed mode frame comprises the back compatible part of at least two first frequencies and the greenery patches part of a second frequency.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59109704P | 2004-07-27 | 2004-07-27 | |
| US60/591,097 | 2004-07-27 | ||
| US60/624,197 | 2004-11-03 |
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| CN1738250A CN1738250A (en) | 2006-02-22 |
| CN100446459C true CN100446459C (en) | 2008-12-24 |
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| CN1738250A (en) | 2006-02-22 |
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