CN1777130A - Hybrid front-synchronous code for MIMO wireless communications - Google Patents
Hybrid front-synchronous code for MIMO wireless communications Download PDFInfo
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Abstract
A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for a first transmit antenna of the MIMO communication, generating a legacy preamble portion for the frame in accordance with a legacy wireless communication protocol, wherein the legacy preamble portion includes at least a first training sequence and a second training sequence and generating a current protocol preamble portion for the frame in accordance with a protocol of the MIMO wireless communication. The processing continues, for at least a second antenna of the MIMO communication, by generating a cyclically shifted legacy preamble portion for the frame, wherein the cyclically shifted legacy preamble portion includes at a cyclically shifted first training sequence and a cyclically shifted second training sequence, wherein the cyclically shifted first training sequence is time-shifted with respect to the first training sequence by a fraction of duration of the legacy preamble portion, and wherein the cyclically shifted second training sequence is time-shifted with respect to the second training sequence by the fraction of duration of the legacy preamble portion and generating a second current protocol preamble portion for the frame in accordance with a protocol of the MIMO wireless communication.
Description
Technical field
The present invention relates to wireless communication system, relate in particular to a kind of wireless communication system of in WLAN (wireless local area network), supporting a plurality of wireless communication protocols.
Background technology
As everyone knows, communication system can be supported the wireless and wire communication between wireless and/or the wire communication facility.Such communication system from domestic and/or international cellular telephone communication system to the internet to point-to-point indoor wireless networks.Every kind of communication system is all constructed and is moved in view of the above according to one or more communication standards.For example, wireless communication system can be according to one or more standard operations, and these standards include but not limited to: IEEE802.11, bluetooth, advanced mobile phone service (AMPS), digital AMPS, global system for mobile communications (GSM), code division multiple access (CDMA), LMDS (LMDS), Multichannel, Multipoint Distribution System (MMDS) and/or its variation.
Type according to wireless communication system, a Wireless Telecom Equipment, for example cell phone, intercom, PDA(Personal Digital Assistant), PC (PC), kneetop computer, home entertainment device etc. can be communicated by letter with other Wireless Telecom Equipment directly or indirectly.For direct communication (being also referred to as point-to-point communication), the Wireless Telecom Equipment that participates in communication is transferred to identical channel (for example, in a plurality of radio frequencies (RF) carrier wave of wireless communication system) with their receiver and reflector, and by this channel communication.For indirect radio communication, each Wireless Telecom Equipment is directly communicated by letter with relevant base station (for example base station, cellular service) and/or relevant access point (for example indoor or wireless network that building is interior) by channel appointed.In order to finish the communication between the Wireless Telecom Equipment, relevant base station and/or relevant access point be by system controller, by public switched telephone network, by the internet, and/or other wide area network direct communications each other by some.
For each communication equipment that participates in radio communication, all comprise built-in wireless transceiver (just receiver and reflector) or continuous with relevant wireless transceiver (for example, the cordless communication network station in the indoor and/or building, RF modulator-demodulator etc.).Road as known, reflector comprises data-modulated level, one or more intermediater-frequency stage and power amplifier.The data-modulated level is converted to baseband signal according to specific wireless communication standard with initial data.These one or more intermediater-frequency stages are mixed baseband signal with one or more local oscillators, to generate the RF signal.Before by the antenna emission, power amplifier amplifies the RF signal.
Road as known also, the receiver that links to each other with antenna comprise that low noise amplifier, one or more intermediater-frequency stage, filtering stage and data recover level.Low noise amplifier is by antenna reception of inbound RF signal, then with its amplification.These one or more intermediater-frequency stages are mixed the RF signal that amplifies with one or more local oscillators, thereby the RF conversion of signals of amplifying is become baseband signal or intermediate frequency (IF) signal.Filtering stage to weaken unwanted out of band signal, generates filtered signal to baseband signal or IF signal filtering.Data are recovered level according to specific wireless communication standard, recover initial data from filtered signal.
Road as known also, the standard that Wireless Telecom Equipment is deferred in wireless communication system is transformable.For example, IEEE 802.11 standards are evolved to IEEE 802.11b from IEEE 802.11, to IEEE802.11a, to IEEE 802.11g, the Wireless Telecom Equipment of deferring to IEEE 802.11b may be present in the identical wireless lan (wlan) with the Wireless Telecom Equipment of deferring to IEEE 802.11g.As another example, the Wireless Telecom Equipment of deferring to IEEE 802.11a may be present in the identical wireless lan (wlan) with the Wireless Telecom Equipment of deferring to IEEE 802.11g.When legacy version equipment (just, defer to those equipment than the older version standard) when being present among the identical WLAN with the equipment of deferring to later release criteria, need to use a kind of mechanism to guarantee that legacy version equipment knows that the equipment of more recent version when is using wireless channel, to avoid conflict.
For example, the back compatible with legacy version equipment realizes at physics (PHY) layer (under the situation of IEEE 802.11b) or medium access control (MAC) layer (under the situation of IEEE 802.11g).At the PHY layer, realize back compatible by the PHY layer preamble of standard before utilizing again.In this case, will the decode preamble portion of all signals of legacy version equipment, this is for determining whether wireless channel provides enough information in use in certain period of time, even therefore legacy version equipment can not perfect restitution and/or the frame that is transmitted of decoding, also can avoid conflict.
At the MAC layer, use used pattern or the data transfer rate of legacy version equipment to send special frame by the equipment of forcing to defer to the redaction standard, thus the back compatible of realization and legacy version equipment.For example, the equipment of more recent version can send clear to send/request and send (CTS/RTS) switching frame and/or clear to send to self (CTS to self) frame, as adopting among the IEEE 802.11g.These special frames comprise the information of the NAV (network allocation vector) that sets legacy version equipment, make these equipment know when wireless channel is used by the equipment of more recent version.
Do not have back compatible and the equipment that uses independently of one another with respect to those, the mechanism of existing two kinds of back compatibles all has loss on performance.
Therefore, need a kind of can be in wireless communication system---comprise in the WLAN (wireless local area network), support various protocols method and apparatus.
Summary of the invention
Equipment that the present invention relates to move and method, this operates in and has done further description in following description of drawings, embodiment and the claim.From following that make with reference to accompanying drawing, detailed description of the present invention, it is obvious that other features and advantages of the present invention will become.
According to an aspect of the present invention, providing a kind of is the method for the preamble of multiple-input, multiple-output (MIMO) radio communication delta frame, and this method comprises:
First transmitting antenna for MIMO communication:
According to the legacy version wireless communication protocol is that frame generates the legacy version preamble portion, and wherein the legacy version preamble portion comprises first training sequence and second training sequence at least; And
According to the mimo wireless communication agreement is the preamble portion that frame generates current (current) agreement;
At least one second antenna for MIMO communication:
Generate the legacy version preamble portion of cyclic shift for frame, wherein the legacy version preamble portion of cyclic shift comprises first training sequence of cyclic shift and second training sequence of cyclic shift at least, wherein first training sequence of cyclic shift is the segment with respect to the duration of the first training sequence time shift legacy version preamble portion, wherein, second training sequence of cyclic shift is the segment with respect to the duration of the second training sequence time shift legacy version preamble portion.
According to the mimo wireless communication agreement is that frame generates the second current agreement preamble portion.Preferably, this method also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generate the legacy version preamble portion of the cyclic shift that comprises the secondary signal field according to the legacy version wireless communication protocol.
Preferably, this method also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generation comprises the legacy version preamble portion of cyclic shift of the signal field of cyclic shift, and wherein the signal field of cyclic shift is the segment with respect to the duration of signal field time shift legacy version preamble portion.
Preferably, this method also comprises:
Between first and second training sequences, generate duplicate protection at interval according to the legacy version wireless communication protocol; And
Between the training sequence of first and second cyclic shifts, generate second duplicate protection at interval according to the legacy version wireless communication protocol.
Preferably, when the legacy version wireless communication protocol was IEEE 802.11a or IEEE 802.11g, the duration segment of legacy version preamble portion comprised at least one in following:
The scope of positive 50 nanoseconds to positive 400 nanoseconds; And
The scope of negative 50 nanoseconds to negative 400 nanoseconds.
Preferably, this method also comprises:
First training sequence that comprises short training sequence; And
Second training sequence that comprises long training sequence.
According to feature of the present invention, wireless frequency (RF) reflector comprises:
Baseband processing module is in order to convert outbound data to the departures symbols streams; And
Transmitter portion converts departures RF signal in order to the symbols streams that will set off, and wherein baseband processing module is used for:
First transmitting antenna for MIMO communication:
According to the legacy version wireless communication protocol is that frame generates the legacy version preamble portion, and wherein the legacy version preamble portion comprises first training sequence and second training sequence at least; And
According to the mimo wireless communication agreement is the preamble portion that frame generates current agreement; At least one second antenna for MIMO communication:
Generate the legacy version preamble portion of cyclic shift for frame, wherein the legacy version preamble portion of cyclic shift comprises first training sequence of cyclic shift and second training sequence of cyclic shift at least, wherein first training sequence of cyclic shift is with respect to the segment of the duration of the first training sequence time shift legacy version preamble portion, wherein, second training sequence of cyclic shift is the segment with respect to the duration of the second training sequence time shift legacy version preamble portion.
According to the mimo wireless communication agreement is that frame generates the second current agreement preamble portion.Preferably, this reflector also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generate the legacy version preamble portion of the cyclic shift that comprises the secondary signal field according to the legacy version wireless communication protocol.
Preferably, this reflector also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generation comprises the legacy version preamble portion of cyclic shift of the signal field of cyclic shift, and wherein the signal field of cyclic shift is in the segment with respect to duration of signal field time shift legacy version preamble portion.
Preferably, this baseband processing module can also:
Between first and second training sequences, generate duplicate protection at interval according to the legacy version wireless communication protocol; And
Between the training sequence of first and second cyclic shifts, generate second duplicate protection at interval according to the legacy version wireless communication protocol.
Preferably, when the legacy version wireless communication protocol was IEEE 802.11a or IEEE 802.11g, the duration segment of legacy version preamble portion comprised at least one in following:
The scope of positive 50 nanoseconds to positive 400 nanoseconds; And
The scope of negative 50 nanoseconds to negative 400 nanoseconds.Preferably, this reflector comprises:
First training sequence that comprises short training sequence; And
Second training sequence that comprises long training sequence.
Description of drawings
Fig. 1 is the schematic block diagram according to wireless communication system of the present invention.
Fig. 2 is the schematic block diagram according to Wireless Telecom Equipment of the present invention.
Fig. 3 is the schematic block diagram according to another Wireless Telecom Equipment of the present invention.
Fig. 4 is the schematic block diagram according to RF reflector of the present invention.
Fig. 5 is the schematic block diagram according to RF receiver of the present invention.
Fig. 6 is the schematic block diagram of the access point that communicates with Wireless Telecom Equipment according to the present invention.
Fig. 7 is the schematic diagram according to mimo wireless communication of the present invention.
Fig. 8 is the schematic diagram of the preamble of MIMO communication among Fig. 7.
Embodiment
Fig. 1 is the schematic block diagram of communication system 10, and this communication system 10 comprises a plurality of base stations and/or access point 12-16, a plurality of Wireless Telecom Equipment 18-32 and the network hardware 34.Wireless Telecom Equipment 18-32 can be kneetop computer 18 and 26, personal digital assistant 20 and 30, PC 24 and 32, and/or cell phone main frame 22 and 28.The details of Wireless Telecom Equipment will be done more detailed description with reference to Fig. 2 and/or 3.
Base station or access point 12-16 connect 36,38 and 40 by local area network (LAN) and are operably connected with the network hardware 34.The network hardware 34 can be router, switch, bridge, modulator-demodulator, system controller etc., and it connects 42 for communication system 10 provides Wide Area Network.Each base station or access point 12-16 all dispose relevant antenna or antenna array, so that communicate with Wireless Telecom Equipment in the coverage, this coverage is commonly called basic service set (BSS) 9,11,13.Usually, Wireless Telecom Equipment is to specific base stations or access point 12-14 registration, with the service of received communication system 10.For direct connection (point-to-point communication just), the channel direct communication of Wireless Telecom Equipment by distributing is to produce the ad-hoc network.
Usually, the base station is used for cell phone system and similar system, and access point is used for the wireless network in indoor or the building.The communication system of which kind of particular category no matter, each Wireless Telecom Equipment all comprises built-in wireless transmitter and/or is connected with wireless transmitter.Wireless transmitter comprises ultra-linear amplifier and/or programmable multistage amplifier as disclosed herein, strengthening the property, reduce cost, to reduce size, and/or strengthens broadband application.
Fig. 2 is the schematic diagram of Wireless Telecom Equipment, and this Wireless Telecom Equipment comprises main equipment 18-32, and relevant wireless transmitter 60.For the cell phone main frame, wireless transmitter 60 is built-in parts.For personal digital assistant main frame, kneetop computer and/or personal host computer, wireless transmitter 60 can be the parts of built-in or outer connection.
As shown in FIG., main equipment 18-32 comprises processing module 50, memory 52, wave point 54, input interface 58 and output interface 56.Processing module 50 and memory 52 are carried out and the corresponding instruction of the common function of finishing of main equipment.For example, for cellular phone host device, processing module 50 is carried out the corresponding communication function according to specific cellular telephony standard.
Digit receiver processing module 64 and digit emitter processing module 76, in conjunction with the operational order that is stored in the memory 75, can be according to one or more wireless communication standards and with reference to the one or more functions in other function of Fig. 3-11 description, the function of difference combine digital receiver and the function of digit emitter.This digit receiver function includes but not limited to, digital intermediate frequency to conversion, the demodulation of base band, troop that (constellation) reflection is penetrated, decoding and/or descrambling.The digit emitter function includes but not limited to, scrambling, mapping, modulation and/or the digital baseband conversion to IF of encoding, troop.Can use shared processing apparatus, independent processing apparatus or a plurality of treatment facility to realize digit receiver and reflector processing module 64 and 76.Such processing unit can be microprocessor, microcontroller, digital signal processor, microcomputer, CPU,, field programmable gate array, programmable logic device, state machine, logical circuit, analog circuit, digital circuit and/or any can be according to the device of operational order processing signals (simulation and/or numeral).Memory 75 can be single storage device or a plurality of storage device.But such storage device can be the device of read-only memory, random asccess memory, volatile memory, nonvolatile memory, static memory, dynamic memory, flash memory and/or any storing digital information.Be noted that when processing module 64 and/or 76 is carried out one or more function by state machine, analog circuit, digital circuit and/or logical circuit, the memory of storage corresponding operating instruction is embedded in the circuit, comprises state machine, analog circuit, digital circuit and/or logical circuit.
In operation, wireless transmitter 60 receives outbound data 94 by host interface 62 from main frame.Host interface 62 passes to digit emitter processing module 76 with outbound data 94, digit emitter processing module 76 is according to specific wireless communication standard (for example IEEE 802.11 and various version thereof, bluetooth and various version thereof etc.) handle outbound data 94, thus produce digital transmission formats data 96.These digital transmission formats data 96 are digital baseband signal or the low IF signal of numeral, wherein the frequency of low IF generally at 100 kilo hertzs (KHz) between several megahertzes (MHz).
Digital to analog converter 78 converts digital transmission formats data 96 to analog domain from numeric field.Before analog signal was offered IF mixer stage 82,80 filtering of filtering/gain module were also adjusted the gain of analog signal.According to the reflector local oscillator 83 that local oscillator module 74 provides, IF mixer stage 82 becomes the RF signal with Analog Baseband or low IF conversion of signals.Power amplifier 84 amplifies the RF signal, and to produce departures RF signal 98, exit signal 98 is launched 85 filtering of device filtration module.The antenna 86 RF signal 98 that will set off sends to target device, as base station, access point and/or another Wireless Telecom Equipment.
Analog to digital converter 66 converts filtered check-in signal to numeric field from analog domain, to produce digital received formatted data 90.According to the particular wireless communication standards that wireless transmitter 60 is deferred to, 64 pairs of digital received formatted datas 64 of digit receiver processing module are decoded, descrambling, separate the mapping and/or rectification, to recapture inbound data 92.Host interface 62 offers main process equipment 18-32 by wave point 54 with the inbound data of recapturing 92.
One skilled in the art will appreciate that the Wireless Telecom Equipment among Fig. 2 can use one or more integrated circuits to realize.For example, main equipment can realize on an integrated circuit that digit receiver processing module 64, digit emitter processing module 76 and memory 75 can be realized, the remainder of wireless transmitter 60 on second integrated circuit, except that antenna 86, can on the 3rd integrated circuit, realize.As replaceable example, wireless transmitter 60 can be realized on single integrated circuit.As another example, the processing module 50 of main equipment and digit receiver and reflector processing module 64 and 76 can be the common processing unit of realizing on single integrated circuit.In addition, memory 52 and memory 75 can realize on the single integrated circuit and/or with the common processing module of processing module 50 and digit receiver and reflector processing module 64 and 76 on realize.
Fig. 3 is the schematic block diagram of Wireless Telecom Equipment, and this Wireless Telecom Equipment comprises main equipment 18-32 and relevant wireless transmitter 60.For the cell phone main frame, wireless transmitter 60 is build-in components.For personal digital assistant main frame, kneetop computer and/or personal host computer, wireless transmitter 60 can be built-in or external parts.
Wireless transmitter 60 comprises host interface 62, baseband processing module 63, memory 65, a plurality of radio frequency (RF) reflector 67,69,71, emission/reception (T/R) module 73, a plurality of antenna 81,83,85, a plurality of RF receiver 75,77,79, and local oscillator module 99.Baseband processing module 63, in conjunction with the operational order that is stored in the memory 65, difference combine digital receiver function and digit emitter function.The digit receiver function includes but not limited to: digital intermediate frequency to conversion, the rectification of base band, troop separate mapping, decoding, release of an interleave, fast fourier transform, Cyclic Prefix remove (cyclic prefix removal), room and time decoding and/or descrambling.The digit emitter function includes but not limited to: the increase of scrambling, coding, interlock, troop mapping, modulation, inverse fast fourier transformed, Cyclic Prefix, room and time coding and/or digital baseband are to the IF conversion.Baseband processing module 63 can use one or more processing unit to realize.Such processing unit can be microprocessor, microcontroller, digital signal processor, microcomputer, CPU, field programmable gate array, programmable logic device, state machine, logical circuit, analog circuit, digital circuit, and/or any can be according to the device of operational order processing signals (simulation and/or numeral).Memory 66 can be single storage device or a plurality of storage device.But such storage device can be the device of read-only memory, random asccess memory, volatile memory, nonvolatile memory, static memory, dynamic memory, flash memory and/or any storing digital information.Be noted that when processing module 63 is carried out one or more function by state machine, analog circuit, digital circuit and/or logical circuit, the memory of storage corresponding operating instruction is embedded in the circuit, and this circuit comprises state machine, analog circuit, digital circuit and/or logical circuit.
Be in operation, wireless transmitter 60 receives outbound data 87 by host interface 62.Baseband processing module 63 receives outbound data 87, and according to mode select signal 101, produces one or more departures symbols streams 89.Mode select signal 101 will be indicated specific pattern, shown in the model selection table.For example, mode select signal 101 with reference to table 1, can be indicated the frequency range, 20 and the channel width of 22MHz and the maximum bit rate of per second 54 megabits (Mbps) of 2.4GHz.In common classification, mode select signal also can be indicated the specific bit rate scope from per second 1 megabit (Mbps) to per second 54 megabits (Mbps).In addition, mode select signal will be indicated the modulation of particular type, includes but not limited to: the modulation of Bark (Barker) sign indicating number, BPSK, QPSK, CCK, 6QAM and/or 64QAM.As further showing in the table 1, provide decibels (EVM) that coding figure place (NBPSC), the coding figure place (NCBPS) of each OFDM symbol, the data bits (NDBPS) of each OFDM symbol, the error vector of encoding rate and each subcarrier measure (error vectormagnitude), sensitivity----it indicate to reach the desired maximal received power of targeted packets error rates of data (for example IEEE 802.11a requires 10%), adjacent channel suppress (ACR) and alternately adjacent channel suppress (AACR).
Mode select signal also can indicate the particular channel of associative mode and select, and the channel of information is chosen in shown in the table 2 in the correspondence table 1.As shown in Table, table 2 comprises the number of channel and corresponding centre frequency.But mode select signal is indicated horsepower spectrum density mask value (power spectral density maskvalue) also, and the power spectral density masks value in the table 1 is shown in the table 3.As selection, mode select signal also can be indicated ratio (rates) in table 4, and this ratio has the maximum bit rate of 5GHz frequency range, 20MHz channel width and per second 54 megabits.If this is specific model selection, channel is selected as shown in table 5.Select as another, mode select signal 102 can be indicated the maximum bit rate of 2.4GHz frequency range, 20MHz channel and per second 192 megabits, and is as shown in table 6.In table 6, utilize many antennas to realize higher bandwidth.In this case, model selection also indicates available antenna amount.Table 7 has shown the channel selection in the table 6.Table 8 shows another kind of model selection, and its Mid Frequency is that 2.4GHz, channel width are that 20MHz, maximum bit rate are per second 192 megabits.Corresponding table 8 comprise utilize 2-4 antenna, the various bit rates from per second 12 megabits to per second 216 megabits, and Space Time Coding rate as shown in the figure.Table 9 has shown the channel selection in the table 8.Mode select signal 102 has also been indicated certain operational modes as shown in table 10, and it has the 40MHz frequency band of 40MHz channel and the maximum bit rate of per second 486 megabits corresponding to the frequency range of 5GHz.As shown in table 10, utilize 1-4 antenna and corresponding Space Time Coding rate, the scope of bit rate can be in per second 13.5 megabits between per second 486 megabits.Table 10 also shows special modulation scheme encoding rate and NBPSC value.Table 11 provides power spectral density masks for table 10, and table 12 provides the channel selection for table 10.
According to mode select signal 101, baseband processing module 63 produces one or more departures symbols streams 89 from dateout 88.For example, used single transmitting antenna if mode select signal 101 is designated as the AD HOC of selection, baseband processing module 63 will produce single departures symbols streams 89.As selection, if 2,3 or 4 antennas of mode select signal indication, baseband processing module 63 will or produce 2,3 or 4 departures symbols streams 89, and the quantity of these departures symbols streams 89 is corresponding with the antenna amount of dateout 88.
The quantity of the departures stream 89 that produces according to baseband module 63, the RF reflector 67,69,71 of respective amount will be activated, thereby the symbols streams 89 of departures is converted to the RF signal 91 of departures.The realization of RF reflector 67,69,71 will be further described with reference to Fig. 4.Transmit/receive module 73 receives departures RF signal 91 and each departures RF signal is offered corresponding antenna 81,83,85.
When wireless transmitter 60 was in receiving mode, emission/reception (T/R) module 73 received one or more inbound RF signals by antenna 81,83,85.T/R module 73 offers one or more RF receivers 75,77,79 with inbound RF signal 93. RF receiver 75,77,79 (doing more detailed description with reference to Fig. 4) converts inbound RF signal 93 to the inbound symbols streams 96 of respective amount.The AD HOC that the quantity of inbound symbols streams 95 adopts when receiving data (this pattern can be in the pattern shown in the table 1-12 any) is corresponding.Baseband processing module 63 reception of inbound symbols streams 89 also convert them to inbound data 97, and this inbound data 97 is provided for main equipment 18-32 by host interface 62.
One skilled in the art will appreciate that the Wireless Telecom Equipment among Fig. 3 can use one or more integrated circuits to realize.For example, main equipment can realize on an integrated circuit that baseband processing module 63 and memory 65 can be realized on second integrated circuit, and the remainder of wireless transmitter 60 except the antenna 81,83,85, can realize on the 3rd integrated circuit.As replaceable example, wireless transmitter 60 can be realized on single integrated circuit.As another example, the processing module 50 of main equipment and baseband processing module 63 can be the common treatment facilities of realizing on single integrated circuit.In addition, memory 52 and memory 65 can realize on the single integrated circuit and/or with the common processing module of processing module 50 and baseband processor 63 on realize.
Fig. 4 is the schematic block diagram of the embodiment of RF reflector 67,69,71.The RF reflector comprises digital filter and make progress sampling module 475, D/A converter module 477, analog filter 479, up-conversion module 481, power amplifier 483 and RF filter 485.The digital filter and the sampling module 475 that makes progress receive departures symbols streams 89 and with its digital filtering, the ratio with symbols streams upwards is sampled to required ratio then, to produce filtered symbols streams 487.D/A converter module 477 converts filtered symbol 487 to analog signal 489.Analog signal can comprise in-phase component and quadrature component.
Analog filter 479 is with analog signal 489 filtering, to produce filtered analog signal 491.Up-conversion module 481 comprises a pair of frequency mixer and filter, with local oscillator 493 mixing of filtered analog signal 491 with 99 generations of local oscillator module, to produce high-frequency signal 495.The frequency of high-frequency signal 495 is corresponding with the frequency of RF signal 492.
Power amplifier 483 amplifies high-frequency signal 495, the high-frequency signal 497 that is exaggerated with generation.RF filter 485 can be a high freguency bandpass filter, with high-frequency signal 497 filtering that are exaggerated, to produce required output RF signal 91.
Those skilled in the art will appreciate that, each radiofrequency launcher 67,69,71 all will comprise similar structures shown in Figure 4, also comprise (shut-down) mechanism of closing, like this when not needing certain specific RF reflector, it can be closed, make it not produce interference signal and/or noise.
Fig. 5 is the schematic block diagram of each RF receiver 75,77,79.In this embodiment, each RF receiver comprises RF filter 501, low noise amplifier (LNA) 503, programmable gain amplifier (PGA) 505, down conversion module 507, analog filter 509, analog-to-digital conversion module 511 and digital filtering and downsampled module 513.RF filter 501 can be a high freguency bandpass filter, accepts inbound RF signal 93 and with they filtering, to produce filtered inbound RF signal.Low noise amplifier 503 amplifies filtered inbound RF signal 93 according to gain setting, and the signal that is exaggerated is offered programmable gain amplifier 505.Programmable gain amplifier also before inbound RF signal 93 is offered down conversion module 507, amplifies inbound RF signal 93.
Down conversion module 507 comprises a pair of frequency mixer, addition module and filter, thereby the local oscillator (LO) that inbound RF signal and local oscillator module provide is mixed, to produce analog baseband signal.Analog filter 509 is analog baseband signals, and they are offered analog to digital converter module 511, and analog to digital converter module 511 converts them to digital signal.Digital filter and downsampled module 513 are adjusted sampling rate then with digital signal filter, to produce inbound symbols streams 95.
Fig. 6 is the schematic block diagram of the access point 12-16 that communicates by letter with Wireless Telecom Equipment 25,27 and/or 29.Wireless Telecom Equipment 25,27 and/or 29 can be any one among the equipment 18-32 shown in Fig. 1-3.In this example, access point 12-16 comprises processing module 15, memory 17 and wireless transceiver 19.Wireless transceiver 19 is structurally similar with the wireless transceiver of each Wireless Telecom Equipment, can comprise a plurality of antennas, a plurality of transmit path and a plurality of RX path, is used for the multi-way radio communication in adjacent domain or the basic service set.Processing module 15 can be single processing unit or a plurality of processing unit.Such processing unit can be microprocessor, microcontroller, digital signal processor, microcomputer, CPU, field programmable gate array, programmable logic device, state machine, logical circuit, analog circuit, digital circuit, and/or any can be according to the device of operational order processing signals (simulation and/or numeral).Memory 17 can be single storage device or a plurality of storage device.But such storage device can be the device of read-only memory, random asccess memory, volatile memory, nonvolatile memory, static memory, dynamic memory, flash memory, cache memory and/or any storing digital information.Be noted that when processing module 15 is carried out one or more function by state machine, analog circuit, digital circuit and/or logical circuit, the memory of storage corresponding operating instruction is to embed circuit, and this circuit comprises state machine, analog circuit, digital circuit and/or logical circuit.At least some steps and/or function instruction corresponding among memory 17 storages, processing module 15 execution and Fig. 7-8.
In this example, each Wireless Telecom Equipment 25,27 utilizes different wireless communication protocols with 29.As shown in the figure, Wireless Telecom Equipment 25 utilizes agreement A 35, Wireless Telecom Equipment 27 to utilize agreement B37, Wireless Telecom Equipment 29 to utilize agreement C39.For example, the different editions that agreement A, B and C can corresponding IEEE 802.11 standards.As example, agreement A can be corresponding with IEEE 802.11b, agreement B can agreement C can be corresponding with IEEE 802.11n with IEEE802.11g is corresponding.
Described agreement can be according to the ordering of agreement sequencing table, and this agreement sequencing table has been listed agreement A, agreement B and agreement C in order.This order can be according to the version ordering of each agreement correspondence, and wherein first agreement in the order is the oldest standard, and last in the agreement order is up-to-date standard.For example, in this example, agreement A is corresponding with IEEE 802.11b, agreement B is corresponding and agreement C is corresponding with IEEE802.11n with IEEE 802.11g.Optionally, the agreement order also can be depending on order user-defined and/or system manager's definition.For example, when utilizing agreement A to set up radio communication, reach unacceptable degree owing to can't discern the quantity that frame makes error of transmission, the user can select agreement B form to set up radio communication.This content will be done detailed description with reference to remaining accompanying drawing.
Be in operation, access point 12-16 and/or each Wireless Telecom Equipment 25,27 and 29 are determined the agreement of being utilized by each Wireless Telecom Equipment in adjacent domain.Adjacent domain can comprise basic service set and/or contiguous basic service set and/or directly or multi-hop (ad-hoc) network, and this is directly or in multi-hop (ad-hoc) network, the Wireless Telecom Equipment direct communication.In case determined the agreement of each Wireless Telecom Equipment, which agreement access point 12-16 and/or Wireless Telecom Equipment 25-29 according to the agreement order, determine to adopt set up radio communication.For example, if agreement A is corresponding with IEEE 802.11b, communication equipment will utilize MAC layer protection mechanism to set up radio communication.Like this, each Wireless Telecom Equipment all will utilize agreement A to set up radio communication, make legacy version equipment can recognize radio communication and be established, and also can recognize the duration of radio communication, make it in that time, can not send, therefore avoided conflict.
In case utilize the agreement of selecting from the agreement order (for example, agreement A) to set up radio communication, communication equipment utilizes the remainder transmission data of the agreement of itself for radio communication then.For example, Wireless Telecom Equipment 25 utilizes agreement A to set up radio communication and is radio communication transmission data.Wireless Telecom Equipment 27 utilizes agreement A to set up radio communication, and use agreement B carries out the respective data transfer of radio communication then.Similarly, Wireless Telecom Equipment 29 utilizes agreement A to set up radio communication, utilizes agreement C to carry out the tcp data segment of radio communication then.
One skilled in the art will appreciate that if adjacent domain only comprises the Wireless Telecom Equipment that utilizes same protocol then foundation and transfer of data utilize this agreement to finish.Those skilled in the art will also appreciate that,, will select the agreement of legacy version as setting up agreement if two different agreements only occur in the contiguous zone.
Fig. 7 is the radio communication schematic diagram between two Wireless Telecom Equipments 100 and 102, and each Wireless Telecom Equipment is all deferred to IEEE 802.11n.Such communication can comprise the equipment of deferring to 802.11n, defer to the equipment of 802.11a and/or defer in the adjacent domain of equipment of 802.11g and take place.In this example, radio communication can be direct or indirect, and wherein frame 110 comprises the first transmitting antenna part 110-1 and the second transmitting antenna part 110-2.The first transmitting antenna part 110-1 comprises preamble and data division 108.Preamble comprises legacy version part 112 and current protocol section 114.The second transmitting antenna part 110-2 comprises second preamble and the second data division 108-1.Second preamble comprises legacy version part 112-1 and second current protocol section 114-1 of cyclic shift.
The legacy version part 112 of preamble is formative according to one or more legacy version wireless communication standards, and these standards include but not limited to: GSM, IEEE 802.11 (a) and (b), (g), (j), bluetooth or their other version.In addition, legacy version part 112 comprises first training sequence and second training sequence at least.Such training sequence is used for detection signal, characteristics of signals and frame duration.The legacy version part 112-1 of the cyclic shift of preamble comprises first training sequence of cyclic shift and second training sequence of cyclic shift.Be noted that if the legacy version part 112 of preamble comprises plural training sequence the legacy version of the cyclic shift of preamble part can comprise the training sequence of a plurality of cyclic shifts.
First training sequence of cyclic shift is duplicating of first training sequence, and it has time displacement, this time shift with respect to first training sequence is the segment of duration of the preamble of frame 110.For example, the duration segment of preamble can arrive between positive 400 nanoseconds positive 50 nanoseconds, perhaps between negative 50 nanoseconds to negative 400 nanoseconds.Second training sequence of cyclic shift is duplicating of second training sequence, and it has time displacement with respect to first training sequence, and this time shift is the segment of the duration of preamble.
The preamble portion 114 of current agreement and the preamble portion 114-1 of the second current agreement comprise the additional training sequence that is used for Wireless Telecom Equipment, and this Wireless Telecom Equipment is deferred to current wireless communication protocol (for example IEEE 802.11n).For example, the preamble portion 114 of current agreement can comprise the additional long training sequence that replenishes, and each duration is 4 microseconds; High data-signal field, each duration is 4 microseconds, so that the additional information about frame to be provided.Data division 108 comprises that the duration is the symbol of 4 microseconds.In this case, provide the legacy version protection in physical layer.
Fig. 8 is the schematic diagram of exemplary preamble of the MIMO communication of Fig. 7.In this example, current wireless communication protocol is IEEE 802.11n, and the wireless communication protocol of legacy version is IEEE 802.11 (a) and/or (g).As shown in the figure, the first transmitting antenna frame part 110-1 comprises: short training sequence (STS) symbol 120, this short training sequence are first training sequences of the legacy version part 112 of preamble; Double protection is (GI2) 122 at interval; Repeating twice long training sequence (LTS) symbol 124,126, is second training sequence of the legacy version part 112 of preamble; Guard interval (GI) 128, and signal field 129.The second transmitting antenna frame part 110-2 comprises: the cyclic shift symbol 130 of short training sequence (STS), this short training sequence are first training sequences of cyclic shift of legacy version part 112-1 of the cyclic shift of preamble; Double protection is (GI2) 132 at interval; Repeating the cyclic shift symbol 134,136 of twice long training sequence (LTS), is second training sequence of cyclic shift of legacy version part 112-1 of the cyclic shift of preamble; Guard interval (GI) 138, and signal field 139.
As further shown in FIG., the STS symbol 130 of cyclic shift comprises identical with STS symbol 120 but at the symbol of the duration of preamble segment 150 time shifts.As mentioned, this duration segment+/-five ten nanoseconds between+/-four hundred nanoseconds.Similarly, the LTS symbol 134,136 of cyclic shift comprises identical with LTS symbol 134,136 but at the symbol of identical duration segment 150 time shifts of preamble.
In this example, short training sequence (STS) symbol 120 was sent out in the duration of 8 microseconds, and the STS symbol 130 of cyclic shift equally also is sent out in the duration of 8 microseconds.Signal field 129,139, the duration is 4 microseconds, comprises the position of the duration of several display frames 110.Like this, defer to the equipment of deferring to IEEE 802.11g in the equipment of IEEE802.11a and the adjacent domain in the adjacent domain and will identify frame 110 and be transmitted, even the remainder that these equipment can not decoded frame.In this case, according to the suitable decoding to the legacy version part 112 of preamble, legacy version equipment (IEEE802.11a and IEEE 802.11g) can be avoided the conflict of communicating by letter with IEEE 802.11n.
Aforementioned discussion has provided the various embodiment of radio communication in the wireless communication system that comprises a plurality of Wireless Telecom Equipments of following different agreement.For example, can comprise plural transmitting antenna in the frame.One skilled in the art will appreciate that from demonstration of the present invention, to obtain other embodiment, and do not break away from the scope of claim.
The model selection table:
Table 1:2.4GHz, 20/22MHz channel BW, 54Mbps maximum bit rate
| Ratio | Modulation | Encoding rate | NBPSC | NCBPS | NDBPS | EVM | Sensitivity | ACR | AACR |
| 1 2 5.5 6 9 11 12 18 24 36 48 54 | Bark BPSK Bark QPSK CCK BPSK BPSK CCK QPSK QPSK 16-QAM 16-QAM 64-QAM 64-QAM | 0.5 0.75 0.5 0.75 0.5 0.75 0.666 0.75 | 1 1 2 2 4 4 6 6 | 48 48 96 96 192 192 288 288 | 24 36 48 72 96 144 192 216 | -5 -8 -10 -13 -16 -19 -22 -25 | -82 -81 -79 -77 -74 -70 -66 -65 | 16 15 13 11 8 4 0 -1 | 32 31 29 27 24 20 16 15 |
Table 2: the channel of table 1 is selected
| Channel | Frequency (MHz) |
| 1 2 3 4 5 6 7 | 2412 2417 2422 2427 2432 2437 2442 |
| 8 9 10 11 12 | 2447 2452 2457 2462 2467 |
Table 3: the power spectral density masks value of table 1
| The frequency shift (FS) of PSD mask value | 1 dBr |
| -9MHz to 9MHz+/-11MHz+/-20MHz+/-30MHz and bigger | 0 -20 -28 -50 |
Table 4:5GHz, 20MHz channel BW, 54Mbps maximum bit rate
| Ratio | Modulation | Encoding rate | NBPSC | NCBPS | NDBPS | EVM | Sensitivity | ACR | AACR |
| 6 9 12 18 24 36 48 54 | BPSK BPSK QPSK QPSK 16-QAM 16-QAM 64-QAM 64-QAM | 0.5 0.75 0.5 0.75 0.5 0.75 0.666 0.75 | 1 1 2 2 4 4 6 6 | 48 48 96 96 192 192 288 288 | 24 36 48 72 96 144 192 216 | -5 -8 -10 -13 -16 -19 -22 -25 | -82 -81 -79 -77 -74 -70 -66 -65 | 16 15 13 11 8 4 0 -1 | 32 31 29 27 24 20 16 15 |
Table 5: the channel of table 4 is selected
| Channel | Frequency (MHz) | Country | Channel | Frequency (MHz) | Country |
| 240 244 248 252 8 12 16 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 | 4920 4940 4960 4980 5040 5060 5080 5180 5200 5220 5240 5260 5280 5300 5320 5500 5520 5540 5560 5580 5600 5620 5640 5660 5680 | The Japanese U.S./European the U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European the U.S./Europe | 34 38 42 46 | 5170 5190 5210 5230 | Japan Japan Japan Japan |
| 140 149 153 157 161 165 | 5700 5745 5765 5785 5805 5825 | The U.S./European the U.S. U.S. U.S. U.S. U.S. |
Table 6:2.4GHz, 20MHz channel BW, 192Mbps maximum bit rate
| Ratio | The TX antenna | The ST encoding rate | Modulation | Encoding rate | NBPSC | NCBPS | NDBPS |
| 12 24 48 96 108 18 36 72 144 162 24 48 96 192 216 | 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 | BPSK QPSK 16-QAM 64-QAM 64-QAM BPSK QPSK 16-QAM 64-QAM 64-QAM BPSK QPSK 16-QAM 64-QAM 64-QAM | 0.5 0.5 0.5 0.666 0.75 0.5 0.5 0.5 0.666 0.75 0.5 0.5 0.5 0.666 0.75 | 1 2 4 6 6 1 2 4 6 6 1 2 4 6 6 | 48 96 192 288 288 48 96 192 288 288 48 96 192 288 288 | 24 48 96 192 216 24 48 96 192 216 24 48 96 192 216 |
Table 7: the channel in the table 6 is selected
| Channel | Frequency (MHz) |
| 1 2 3 4 5 6 7 8 9 10 11 12 | 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 |
Table 8:5GHz, 20MHz channel BW, 192Mbps maximum bit rate
| Ratio | The TX antenna | The ST encoding rate | Modulation | Encoding rate | NBPSC | NCBPS | NDBPS |
| 12 24 48 96 108 18 36 72 144 | 2 2 2 2 2 3 3 3 3 | 1 1 1 1 1 1 1 1 1 | BPSK QPSK 16-QAM 64-QAM 64-QAM BPSK QPSK 16-QAM 64-QAM | 0.5 0.5 0.5 0.666 0.75 0.5 0.5 0.5 0.666 | 1 2 4 6 6 1 2 4 6 | 48 96 192 288 288 48 96 192 288 | 24 48 96 192 216 24 48 96 192 |
| 162 24 48 96 192 216 | 3 4 4 4 4 4 | 1 1 1 1 1 1 | 64-QAM BPSK QPSK 16-QAM 64-QAM 64-QAM | 0.75 0.5 0.5 0.5 0.666 0.75 | 6 1 2 4 6 6 | 288 48 96 192 288 288 | 216 24 48 96 192 216 |
Table 9: the channel of table 8 is selected
| Frequency channels | (MHz) | Country | Frequency channels | (MHz) | Country |
| 240 244 248 252 8 12 16 36 40 44 48 52 56 60 64 100 104 108 | 4920 4940 4960 4980 5040 5060 5080 5180 5200 5220 5240 5260 5280 5300 5320 5500 5520 5540 | The Japanese U.S./European the U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European U.S./European the U.S./Europe | 34 38 42 46 | 5170 5190 5210 5230 | Japan Japan Japan Japan |
| 112 116 120 124 128 132 136 140 149 153 157 161 165 | 5560 5580 5600 5620 5640 5660 5680 5700 5745 5765 5785 5805 5825 | The U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S. U.S. U.S. U.S. U.S. |
Table 10:5GHz, 40MHz channel, 486Mbps maximum bit rate
| Speed | The TX antenna | The ST encoding rate | Modulation | Encoding rate | NBPSC |
| 13.5Mbps 27Mbps 54Mbps 108Mbps 121.5Mbps 27Mbps 54Mbps 108Mbps 216Mbps 243Mbps 40.5Mbps | 1 1 1 1 1 2 2 2 2 2 3 | 1 1 1 1 1 1 1 1 1 1 1 | BPSK QPSK 16-QAM 64-QAM 64-QAM BPSK QPSK 16-QAM 64-QAM 64-QAM BPSK | 0.5 0.5 0.5 0.666 0.75 0.5 0.5 0.5 0.666 0.75 0.5 | 1 2 4 6 6 1 2 4 6 6 1 |
| 81Mbps 162Mbps 324Mbps 365.5Mbps 54Mbps 108Mbps 216Mbps 432Mbps 486Mbps | 3 3 3 3 4 4 4 4 4 | 1 1 1 1 1 1 1 1 1 | QPSK 16-QAM 64-QAM 64-QAM BPSK QPSK 16-QAM 64-QAM 64-QAM | 0.5 0.5 0.666 0.75 0.5 0.5 0.5 0.666 0.75 | 2 4 6 6 1 2 4 6 6 |
Table 11: the power spectral density of table 10 (PSD) mask value
| The frequency shift (FS) of PSD mask value | 2 dBr |
| -19MHz to 19MHz+/-21MHz+/-30MHz+/-40MHz and bigger | 0 -20 -28 -50 |
Table 12: the channel in the table 10 is selected
| Channel | Frequency (MHz) | Country | Channel | Frequency (MHz) | Country |
| 242 250 12 38 46 54 | 4930 4970 5060 5190 5230 5270 | The Japanese U.S./European the U.S./European the U.S./Europe | 36 44 | 5180 5520 | Japan Japan |
| 62 102 110 118 126 134 151 159 | 5310 5510 5550 5590 5630 5670 5755 5795 | The U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S./European the U.S. U.S. |
Claims (10)
1, a kind of is the method for the preamble of multiple-input, multiple-output (MIMO) radio communication delta frame, and this method comprises:
First transmitting antenna for MIMO communication:
According to the legacy version wireless communication protocol is that frame generates the legacy version preamble portion, and wherein the legacy version preamble portion comprises first training sequence and second training sequence at least; And
According to the mimo wireless communication agreement is the preamble portion that frame generates current agreement;
At least one second antenna for MIMO communication:
Generate the legacy version preamble portion of cyclic shift for frame, wherein the legacy version preamble portion of cyclic shift comprises first training sequence of cyclic shift and second training sequence of cyclic shift at least, wherein first training sequence of cyclic shift is the segment with respect to the duration of the first training sequence time shift legacy version preamble portion, wherein, second training sequence of cyclic shift is the segment with respect to the duration of the second training sequence time shift legacy version preamble portion.
According to the mimo wireless communication agreement is that frame generates the second current agreement preamble portion.
2, method according to claim 1 is characterized in that: this method also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generate the legacy version preamble portion of the cyclic shift that comprises the secondary signal field according to the legacy version wireless communication protocol.
3, method according to claim 1 is characterized in that: this method also comprises:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generation comprises the legacy version preamble portion of cyclic shift of the signal field of cyclic shift, and wherein the signal field of cyclic shift is the segment with respect to the duration of signal field time shift legacy version preamble portion.
4, method according to claim 1 is characterized in that: this method also comprises:
Between first and second training sequences, generate duplicate protection at interval according to the legacy version wireless communication protocol; And
Between the training sequence of first and second cyclic shifts, generate second duplicate protection at interval according to the legacy version wireless communication protocol.
5, method according to claim 1 is characterized in that: when the legacy version wireless communication protocol was IEEE 802.11a or IEEE 802.11g, the duration segment of legacy version preamble portion comprised at least one in following:
The scope of positive 50 nanoseconds to positive 400 nanoseconds; And
The scope of negative 50 nanoseconds to negative 400 nanoseconds.
6, method according to claim 5 is characterized in that: this method also comprises:
First training sequence that comprises short training sequence; And
Second training sequence that comprises long training sequence.
7, a kind of wireless frequency (RF) reflector comprises:
Baseband processing module is in order to convert outbound data to the departures symbols streams; And
Transmitter portion converts departures RF signal in order to the symbols streams that will set off, and wherein baseband processing module is used for:
First transmitting antenna for MIMO communication:
According to the legacy version wireless communication protocol is that frame generates the legacy version preamble portion, and wherein the legacy version preamble portion comprises first training sequence and second training sequence at least; And
According to the mimo wireless communication agreement is the preamble portion that frame generates current agreement;
At least one second antenna for MIMO communication:
Generate the legacy version preamble portion of cyclic shift for frame, wherein the legacy version preamble portion of cyclic shift comprises first training sequence of cyclic shift and second training sequence of cyclic shift at least, wherein first training sequence of cyclic shift is the segment with respect to the duration of the first training sequence time shift legacy version preamble portion, wherein, second training sequence of cyclic shift is the segment with respect to the duration of the second training sequence time shift legacy version preamble portion.
According to the mimo wireless communication agreement is that frame generates the second current agreement preamble portion.
8, RF reflector according to claim 7 is characterized in that: also comprise:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generate the legacy version preamble portion of the cyclic shift that comprises the secondary signal field according to the legacy version wireless communication protocol.
9, RF reflector according to claim 7 is characterized in that: also comprise:
Generate the legacy version preamble portion that comprises signal field according to the legacy version wireless communication protocol; And
Generation comprises the legacy version preamble portion of cyclic shift of the signal field of cyclic shift, and wherein the signal field of cyclic shift is the segment with respect to the duration of signal field time shift legacy version preamble portion.
10, RF reflector according to claim 7 is characterized in that: this baseband processing module can also:
Between first and second training sequences, generate duplicate protection at interval according to the legacy version wireless communication protocol; And
Between the training sequence of first and second cyclic shifts, generate second duplicate protection at interval according to the legacy version wireless communication protocol.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/973,595 US7423989B2 (en) | 2004-02-13 | 2004-10-26 | Preamble formats for MIMO wireless communications |
| US10/973,595 | 2004-10-26 | ||
| US60/651,100 | 2005-02-08 | ||
| US11/079,962 | 2005-03-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118345A (en) * | 2009-12-29 | 2011-07-06 | 财团法人工业技术研究院 | System and method for providing preamble codes and generating preamble signals in communication system |
| CN106464327A (en) * | 2014-05-28 | 2017-02-22 | 索尼公司 | Method of controlling signal transmission in cellular mimo system, base station, and cellular mimo system |
| CN108540160A (en) * | 2017-03-02 | 2018-09-14 | 恩智浦有限公司 | Processing module and associated method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7269127B2 (en) * | 2001-10-04 | 2007-09-11 | Bae Systems Information And Electronic Systems Integration Inc. | Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems |
| US7233773B2 (en) * | 2004-02-13 | 2007-06-19 | Broadcom Corporation | Configuring a MIMO communication |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118345A (en) * | 2009-12-29 | 2011-07-06 | 财团法人工业技术研究院 | System and method for providing preamble codes and generating preamble signals in communication system |
| CN106464327A (en) * | 2014-05-28 | 2017-02-22 | 索尼公司 | Method of controlling signal transmission in cellular mimo system, base station, and cellular mimo system |
| CN106464327B (en) * | 2014-05-28 | 2020-01-07 | 索尼公司 | Method for controlling signal transmission in cellular MIMO system, base station and cellular MIMO system |
| CN108540160A (en) * | 2017-03-02 | 2018-09-14 | 恩智浦有限公司 | Processing module and associated method |
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