CN101127583A - System and method for implementing preamble channel in wireless communication system - Google Patents
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Abstract
The invention provides a system and method for realizing preamble channel in wireless communication system. For example in UHDR-DO system, the channel structure used in the preamble channel encoder can effectively transmit more information bit and can obtain enough detection and falsealarm performance. The preamble channel encoder uses tail bit convolution code and cyclic redundancy check. The channel structure can code such as speed indicating bit and MAC mark encoder such as Reed-Solomon encoder is used to code the MAC mark bit. In OFDM coding method, the coded speed indicating bit and MAC mark bit can map to proper carrier wave. The invention can realize preamble channel in wireless communication system.
Description
Technical field
The embodiment of this place explanation relates to radio communication, more specifically, relates to the realization of preamble channel (preamble channel), and this channel provides and relates to the information that how to receive Traffic Channel (traffic channel) in wireless communication system.
Background technology
Be appreciated that in wireless communication system specific Traffic Channel is used for Data transmission between for example base station or WAP (wireless access point) and Wireless Telecom Equipment.Be further appreciated that in order to make Wireless Telecom Equipment receive Traffic Channel exactly and, to need information specific its decoding.For example, in code division multiple access (CDMA) system, the voice and data business can be carried by the information frame of multiple length.Wireless Telecom Equipment may need a plurality of information frame decodings to determine complete information payload (payload).Preamble (preamble) is attached in the information frame to transmit the information about the frame number that will carry payload.Except number of frames, preamble can also carry the information that is used to identify MAC (medium accesses control) ID and data transfer format.Transformat can comprise transfer rate, overall budget number, bag size, modulation, HARQ (mixed automatic retransmission request) delivery time code rate and MIMO (multiple-input and multiple-output) exponent number (rank) of target destination, information frame.The information that also can comprise other in the preamble, for example, the radio link protocol of information frame (RLP) sequence quantity.
Because to the accurate decoding information that needs preamble to comprise of true payload, so be very important to the accurate decoding of preamble.Therefore recently, more system has realized helping to guarantee to the accurate method of decoding of preamble information.For example, in specific system, such as cdma2000 Evolution-Data Optimized (EV-DO) system, with Traffic Channel simultaneously or before preamble information is carried out actual coding on the preamble channel that transmits.Such preamble channel can comprise following information, and the speed indication, ARQ (re-send request may automatically) channel logo, HARQ delivery time code rate, the MIMO that wrap and identify, be used for information such as medium accesses control sign, son arrange, wrap quantity, wrap size and modulation.When Wireless Telecom Equipment entered the particular communication system, the MAC sign was assigned to Wireless Telecom Equipment according to unique international travelling carriage identity code (IMSI).Additional information, time slot (slot) quantity of for example using in each data traffic channels, the preamble that also can be used in the multichannel system for example is entrained.
The term that uses in this specification and the appended claims " Wireless Telecom Equipment " refers to any equipment that can carry out radio communication with for example base station or WAP (wireless access point).Therefore, term " Wireless Telecom Equipment " is including but not limited to cell phone type equipment, also have handheld device (handset), mobile phone, cell phone, mobile communication equipment etc., have wireless communication ability PDA(Personal Digital Assistant), micro radio phone (smartphone), have the computing equipment of wireless communication ability, comprise handheld computer, luggable computer, or even desktop computer etc.
Also be appreciated that, though many examples that here provide and embodiment relate to radio wide area network (WWAN), here Shuo Ming system and method also can be applied to wireless personal domain network (WPAN), wireless lan (wlan), wireless MAN (WMAN) etc.Be appreciated that also this network comprises the access device or the infrastructure of some type, such as the base station in WWAN or WMAN, or such as the access point in WLAN.Therefore be appreciated that these access device/facilities that occur in the specification are interchangeable, and when using a speech, do not mean that and can not use another speech, only explicit state or during by this speech of use context determined.
Therefore, comprise preamble channel recited above such as the EV-DO system; Yet EV-DO family standard begins to develop from primary standard, and promptly 1 * EV-DO develops to Rev.A, Rev.B and present Rev.C, and this will provide higher data rate.Rev.C can have multiple operating mode, and one of them pattern can be backward and the EV-DO compatibility at least, is called ultrahigh speed data rate standards UHDR-DO.In order to make the UHDR-DO system can be backward and the EV-DO system compatible, must carry out preamble channel, it is not the necessary part among the Rev.C.
EV-DO Rev.C uses the modulation technique of known OFDM (OFDM), can think this technology be modulation technique also be many access techniques, many access techniques so that a lot of user can shared channel mode cut apart communication channel.(FDM) is the same with frequency division multiplexing, and OFDM is cut apart channel frequency by the mode that the channel spectrum is divided into the equidistant subcarrier of some.Then, can be carried by the subclass of each subcarrier or subcarrier towards specific user's payload section.Yet be different from FDM, the subcarrier among the OFDM is a quadrature, and therefore can take place slightly overlapping.
Fig. 4 shows the figure of overlapping carrier wave 402 in the OFDM method.As shown in the figure, entire spectrum (B) is divided into the carrier wave 402 of specific quantity.Be appreciated that in the FDM system, need the certain protection band to make each other between the frequency channels and do not interfere.Yet, in the OFDM of Fig. 4 scheme, find out that carrier wave 402 can overlap each other.This is quadratures because of carrier wave 402, so can not interfere each other.Owing to the orthogonal property of carrier wave 402, can use the frequency spectrum (B) of bigger overall bandwidth.
Ofdm system has serial data stream usually, and it is divided into the N-parallel data stream, the data rate of each is the 1/N of serial data stream data rate, each data flow all is mapped to a carrier wave and uses contrary fast Fourier transform (FFT) to combine, with generation time domain waveform to be transmitted.
Ofdm system also can be considered to many access techniques, because single carrier wave or carrier wave group can be assigned to different user.When the user has information to send or receives, can distribute the carrier wave of fixed qty to them, perhaps also can distribute the carrier wave of varied number, such as coming distributing carrier wave based on the data volume that the user receives or sends to the user.Distribution can be controlled by the MAC layer, and it determines resource allocation based on user's request.
Fig. 5 is the X-Y scheme of channel resource in the ofdm system.As shown in the figure, channel resource can just be divided into carrier wave and time slot according to frequency partition.Therefore, channel resource can be regarded as a cover message slot.Each message slot can be assigned to different users or channel.For example, preamble channel can be assigned to the information specific sheet, and Traffic Channel 1 can be distributed to another set of message slot, and Traffic Channel 2 also is assigned to another set of message slot etc.
Summary of the invention
To provide below and be used for realizing the system and method for preamble channel in for example UHDR-DO system.Be used to realize that the channel architecture of preamble channel can effectively transmit the more information position, and use tail bit convolution coding and Cyclic Redundancy Check to reach enough detection and false-alarm performances.The preamble channel structure can be used for encoding such as the speed indicating bit, and MAC indication encoder is used for being encoded in MAC sign position such as Read-Solomon (Reed-S olomon) encoder.Coded speed designator and MAC sign position can be mapped to proper carrier wave in the OFDM encoding scheme.
On the one hand, the conveyer scheme of proposition has comprised above-mentioned coding techniques.This conveyer scheme can be incorporated in uplink or the downlink conveyer scheme as required.The conveyer of preamble channel comprises encoder, modulator block, medium accesses control (MAC) tag encoder and carrier wave mapping block.Encoder is configured on preamble channel information bit is encoded, and it comprises cyclic redundancy check (CRC) encoding block, the tail bit convolution encoder that matches with the CRC coding module and the block interleaved that matches with tail bit convolution encoder.The CRC encoding block is configured to the reception information bit, generates the CRC position, and the CRC position is added information bit formation incoming symbol.Tail bit convolution encoder is configured to and utilizes tail bit technology to generate output symbol from incoming symbol.Block interleaved is configured to staggered output symbol.Output symbol after modulator block is configured to the output symbol after modulation interlocks and generates modulation.The MAC tag encoder is configured to encodes to the MAC identification data.And the carrier wave mapping block is configured to the MAC identification data behind output symbol after the modulation and the coding is mapped to the carrier wave of distributing to preamble channel.
On the other hand, a kind of being used for of proposition comprises top and various technology described below to the method for preamble channel signal encoding.Step below on preamble channel, the information bit Methods for Coding being comprised: generate the CRC position from information bit; The CRC position is added information bit form incoming symbol; Utilize tail bit technology to generate output symbol from incoming symbol; Staggered output symbol; Output symbol after modulation is staggered; To MAC sign position coding; And the MAC sign position behind output symbol after will modulating and the coding is mapped to the OFDM carrier wave of distributing to preamble channel.
On the other hand, the access point of proposition comprises various technology top and that the following describes.Access point comprises receiver, is used for the signal behind the received code, and the OFDM conveyer, is used to generate the code signal of preamble channel.
On the other hand, be used for the encoder that information bit is encoded is comprised various technology top and that the following describes.Encoder comprises repeatable block, CRC encoding block, tail bit convolution encoder and block interleaved.Repeatable block is configured to the duplicate message position.The CRC encoding block is configured to the information bit that receives after repeating, and generates the CRC position, and the CRC position is added information bit formation incoming symbol.Tail bit convolution encoder is configured to and utilizes tail bit technology to generate output symbol from incoming symbol.And block interleaved and tail bit convolution encoder are supporting, and block interleaved is configured to staggered output symbol.
These and other features of the present invention, aspect and embodiment will be below " embodiment " part in describe.
The present invention can realize preamble channel in wireless communication system.
Description of drawings
With reference to the accompanying drawings feature of the present invention, aspect and embodiment are described, wherein:
Fig. 1 is the figure that illustrates according to the example preamble channel encoder of an embodiment, and this encoder is configured to encodes to the speed indicating bit that is used for preamble channel;
Fig. 2 is the figure that illustrates according to the example CRC generative circuit of another embodiment, and this circuit can be comprised in the encoder of Fig. 1;
Fig. 3 is the figure that illustrates according to the example conveyer of another embodiment, and this conveyer comprises the preamble encoder of Fig. 1;
Fig. 4 is the figure that is illustrated in example carrier wave in the ofdm system;
Fig. 5 is the figure that is illustrated in example channels resource in the ofdm system; And
Fig. 6 is the exemplary method that illustrates according to an embodiment, and this method is used for the data control channel is encoded.
Embodiment
The embodiment that the following describes provides the preamble channel coding method, can transmit the preamble information position effectively.Embodiment use tail bit convolution coding and with modulator approach such as BPSK (two-phase PSK), the CRC (cyclic redundancy check (CRC)) that QPSK (quarternary phase-shift keying (QPSK)) or QAM (quadrature amplitude modulation) are supporting.Usually, the embodiment that the following describes describes with reference to BPSK; Yet, be appreciated that not repel here and use other to be convenient to the modulation technique of simple realization.
In addition, after tail bit convolution coding and modulation, the symbol after the modulation can according to executory air-interface standard such as CDMA or OFDM and further conversion transmit being used for.For example, signal can be converted into such as the OFDM sub-carrier waveforms that has or do not have many antennas MIMO or beam shaping.
The realization of the embodiment that the following describes causes frame structure to have having shortened the symbol of expense (overhead), and it can make capacity increase and make scheme more effective.In addition, such frame structure needs signal to noise ratio (Eb/NO) lower in lower delivering power and the receiver to reach false-alarm and the omission performance close with conventional solution.In addition, in certain embodiments, there is no need in false-alarm and false dismissal probability, to have any trading off, because in specific implementation, the same user profile, transport format information and/or subcarrier or the channelizing codes etc. of comprising with information bit in CRC position, they can be used in the inspection mistake.In certain embodiments, the compromise factor that whether exists that influences between false alarm rate and the false dismissal probability comprises the quantity of CRC position and the false alarm rate of needs.If to such an extent as to the quantity of CRC position can't provide lower false alarm rate very little, so compromise will still the existence.
Fig. 1 shows the figure of the example preamble channel encoder 100 that the embodiment according to system and method described herein disposes.For example, the encoder of Fig. 1 can be comprised in the forward link or reverse link conveyer in the UHDR-DO system.Especially, encoder 100 can be used on the forward link, to transmit preamble information in Wireless Telecom Equipment.Be appreciated that the encoder among Fig. 1 and all embodiment that illustrate here, all can in software, hardware or other sub-assembly, carry out.
Therefore, the encoder 100 of Fig. 1 can be used for the speed indication information is encoded, normally 2.As shown in the figure, encoder 100 comprises repeatable block 202, and it is configured to receive repeats certain number of times such as 2 bit rate designators and with it, to generate the position (b) of specific quantity.Then, crc block 104 is configured to CRC position (c) is added in the sequence of input data bit (b).In the example of Fig. 1,2 bit rate designators are repeated once to generate 4 bit data streams.Four anti-phase CRC positions (c) are added in the input position (b) to form 8 bit signs that next will import in the tail bit convolution encoder 106.In some implementations, use anti-phase CRC position (c) can improve performance slightly; Yet, be appreciated that in other embodiments noninverting CRC position (c) can be added in the crc block 104.The CRC potential energy is enough in warning or the miss probability of determining in the receiver.To be described in more detail the example implementation of crc block 104 below.
Then, the output of crc block 104 comprises (b+c) position, and will be input to tail bit convolution encoder 106.With understand the same, convolution coder will (k) input under the situation of k=b+c be converted to the sequence of (n).N bit sequence, or symbol can be used for determining the k position at receiver.Therefore, the effective speed of encoder 102 (R) is R=k/n.
Be appreciated that in the convolution coder 106 of routine,, tailer sequence need be added the sequence end that generates in order suitably to finish cataloged procedure.Typically, tailer sequence is a string " 0 ' s ", in the expense that it is added into data control channel is associated.The tail bit means that state that encoder begins is provided by last (m) position of information sequence, and wherein m is the register capacity that comprises in the size of memory or the encoder.Therefore, encoder begins and finishes with same state, and can eliminate the loss on the coding rate that produces thus in conventional convolution coder.In other words, can eliminate the demand to the rear sequence, this has shortened expense.
Then, the output of tail bit convolution encoder 106 is input to block interleaver 108.Staggered is a kind of with the method for non-adjacent mode array data with the lifting performance.Staggered being mainly used in the numerical data tranmission techniques so that transmission avoids producing burst error.These errors will rewrite the many positions in the delegation, but this error is rare.The staggered head it off that is used for.The data of all transmission have control bit (with staggered independent), such as the error correction position of proofreading and correct after can making channel decoder to the change of specific quantity.If burst error has taken place, and the position that changes is more than these, and then code word can not be correctly decoded.So the position of a certain amount of code word or symbol is transmitted then by staggered.Like this, burst error only influences correctable bit quantity in each code word, so decoder can be correctly decoded.
The output of block interleaver 108 can be modulated, such as, using BPSK, and be mapped to and be used in certain OFDM carrier wave transmitting, this will describe in detail below.
Fig. 2 shows the figure according to the example implementation of the crc block 104 of an embodiment.As shown in the figure, the crc block of Fig. 2 comprises execution: input 201 receives input position (b) therein; With an output 203, carry-out bit (k) is positioned at wherein.The crc block of Fig. 2 also comprises 3 switch 208a, 208b and 208c, and when information bit (b) when being received, they are positioned at the top position.Therefore, output 203 will be sent into from input 201 simply in input position (b).
For addition CRC position, switch 208a, 208b and 208c are moved into lower position, and input 205 and 207 is connected with encoder section 200.In this example, input 205 and 207 is configured to " 0 ' s " is sent into encoder section 200.Encoder section 200 comprises 41 memory register 202a, 202b, 202c and 202d, they are configured to stores in each register 202 input and lasting clock cycle, then input is moved right out to 3 modular two addition device 204a, 204b, 204c.Then, the output of adder 204c is imported into inverter 206, and inverter is configured to the input inversion with adder 204c, and anti-phase result is delivered to output 203.In the example of Fig. 1, four CRC positions (c) after anti-phase are added to information bit (b).
Fig. 3 shows the figure of conveyer 300, and conveyer comprises the encoder 100 that is used for 2 bit rate designators coding.In addition, conveyer 300 also can be to encoding such as 8 bit mac id signals on preamble channel.Conveyer 300 also can comprise the encoder that is used for other channel, such as Traffic Channel and pilot channel (pilotchannel) and other control channel.For easy, the encoder of these channels is not shown.
The output of encoder 100 is transfused to BPSK piece 303, wherein output symbol modulated then in scramble piece 306 by scramble.Scramble makes the data bit randomization, and this can improve the peak to average power ratio that is used to transmit signal.For example, transmit long character string " 1 ' s " if desired, then it is caused peak to average power ratio very high.By randomization, or the scramble data position, peak to average power ratio will reduce.
Then, the output of scramble piece 306 is admitted among the gain block 308a, and enters OFDM mapping block 310 subsequently, and therein, the speed indicating bit after coding and the modulation is mapped to the message slot of distributing to preamble channel.Simultaneously, Reed-Solomn (RS) Reed Solomon Coding can be carried out in MAC sign position in RS encoding block 302.Reed-Solomn error correction is that a kind of dependence is carried out the error correction code that over-sampling comes work to the multinomial that is made of the input position.Multinomial is in some point estimation, and these values are sent out or are recorded then.By Suresh Kumar being surpassed required sampling, multinomial becomes overdetermination.As long as can correctly receive " a lot " points, even containing under " some " bad situations about putting so, receiver still can recover original multinomial.Therefore, in one embodiment, 8 bit macs sign potential energy enough is coded as 32 bit codes.Then, the enough and coded speed indicating bit of the MAC behind coding sign potential energy maps to proper carrier wave together.
In certain embodiments, the message slot distribution method that provides among the 3GPP2 standard C 30-20060731-046 can be used for preamble channel.Therefore, OFDM mapping block 310 can be configured to coded speed indicating bit and MAC sign position are mapped to the message slot that distributes according to the C30-20060731-046 standard.
Fig. 6 shows the flow chart according to the exemplary method of an embodiment of the system and method that illustrates here, and this method is used for preamble channel is encoded.At first, in step 602, data bit (b) generates and repeats.CRC position (c) can generate from data bit (b) in step 604, and is added in the data bit (b).In step 606, the incoming symbol of generation can use tail bit convolution cataloged procedure to encode, to generate output symbol.In certain embodiments, output symbol interweaves in step 608.
Then, output can be modulated in step 610, such as using BPSK, QPSK, QAM etc.At last, the output after the modulation can be used further to modulate such as CDMA or OFDM in step 612 and be used to transmit.
Notice that the conveyer of Fig. 3 can be contained in base station or the access point, access point is to be used to make preamble channel to communicate by letter with Wireless Telecom Equipment.It shall yet further be noted that in order to obtain best performance, should reach maximum such as the diversity on time and/or frequency (diversity).
Though specific embodiment of the present invention illustrates in the above, is appreciated that embodiment described herein only is a kind of example.Therefore, the present invention should not only limit to illustrated embodiment.Or rather, when related with above-mentioned explanation and accompanying drawing, scope of the present invention described herein is only limited by appended claims.
Claims (10)
1. the OFDM conveyer of a preamble channel is characterized in that, comprising:
Encoder is used on preamble channel information bit being encoded, and described encoder comprises:
The cyclic redundancy check (CRC) encoding block is used to receive information bit, generates the cyclic redundancy check (CRC) position, and the cyclic redundancy check (CRC) position is added to information bit to form incoming symbol;
Tail bit convolution encoder is connected with described cyclic redundancy check (CRC) encoding block, and described tail bit convolution encoder is used to use tail bit technology to generate output symbol from incoming symbol; And
Block interleaved is connected with described tail bit convolution encoder, and described block interleaved is used for staggered output symbol;
Modulator block, the output symbol after being used to modulate the output symbol after interlocking and generating modulation;
Medium accesses control identifier encoder is used for medium accesses control identifier data are encoded; And
The carrier wave mapping block is used for the medium accesses control identifier data map behind output symbol after the modulation and the coding to the carrier wave of distributing to described preamble channel.
2. the OFDM conveyer of preamble channel according to claim 1 is characterized in that, described modulator block uses one of following modulator approach that output symbol is modulated:
Two-phase PSK;
Quarternary phase-shift keying (QPSK); And
Quadrature amplitude modulation.
3. the OFDM conveyer of preamble channel according to claim 1, it is characterized in that, also comprise scramble piece that is connected with described modulator block and the gain block that is connected with described scramble piece, described scramble piece is used to use the output symbol after scrambler comes the scramble modulation, and described gain block is used to increase the gain of the output symbol after the scramble.
4. the OFDM conveyer of preamble channel according to claim 1 is characterized in that, described cyclic redundancy check (CRC) encoding block also was used for before described cyclic redundancy check (CRC) position is added to described information bit it is anti-phase.
5. the OFDM conveyer of preamble channel according to claim 1 is characterized in that, described information bit comprises the speed indicating bit, and described OFDM conveyer also comprises repeatable block, is used to repeat described information bit.
6. a coding method is used on preamble channel information bit being encoded, and it is characterized in that, comprising:
Generate the cyclic redundancy check (CRC) position from information bit;
The cyclic redundancy check (CRC) position is added to information bit to form incoming symbol;
Use tail bit convolution technology to generate output symbol from incoming symbol;
Staggered output symbol;
Output symbol after modulation is staggered;
Encoded in medium accesses control sign position; And
Medium accesses control sign position behind output symbol after the modulation and the coding is mapped to the OFDM carrier wave of distributing to preamble channel.
7. coding method according to claim 6 is characterized in that, being encoded in described medium accesses control sign position comprises that using Reed Solomon Coding that described medium accesses is controlled the sign position encodes.
8. an access point is characterized in that, comprising:
Receiver is used for received encoded signal; And
The OFDM conveyer is used to generate the code signal that transmits with preamble channel, and described conveyer comprises:
Channel encoder is used for information bit is encoded, and described channel encoder comprises:
The cyclic redundancy check (CRC) encoding block is used to receive information bit, generates the cyclic redundancy check (CRC) position, and the cyclic redundancy check (CRC) position is added to information bit to form incoming symbol;
Tail bit convolution encoder is connected with described cyclic redundancy check (CRC) encoding block, and described tail bit convolution encoder is used to use tail bit technology to generate output symbol from incoming symbol; And
Block interleaved is connected with described tail bit convolution encoder, and described block interleaved is used for staggered output symbol;
Modulator block, the output symbol after being used to modulate the output symbol after interlocking and generating modulation;
Medium accesses control identifier encoder is used for medium accesses control identifier data are encoded; And
The carrier wave mapping block is used for the medium accesses control identifier data map behind output symbol after the modulation and the coding to the carrier wave of distributing to preamble channel.
9. an encoder is used for information bit is encoded, and it is characterized in that described encoder comprises:
Repeatable block is used for the duplicate message position;
The cyclic redundancy check (CRC) encoding block is used to receive the information bit after the repetition, generates the cyclic redundancy check (CRC) position, and the cyclic redundancy check (CRC) position is added to described information bit to form incoming symbol;
Tail bit convolution encoder is connected with described cyclic redundancy check (CRC) encoding block, and described tail bit convolution encoder is used to use tail bit technology to generate output symbol from incoming symbol; And
Block interleaved is connected with described tail bit convolution encoder, and described block interleaved is used for staggered described output symbol.
10. encoder according to claim 9 is characterized in that, described cyclic redundancy check (CRC) encoding block comprises:
Input is used to receive the information bit after the repetition;
Output is used to export incoming symbol;
Encoding block, described encoding block is used to generate the cyclic redundancy check (CRC) position, and described encoding block comprises at least one 1 memory register and at least one modular two addition device; And
Switching network is connected between described input and the described output and between described encoder and the described output, described switching network is used for switchably described input being connected with described output with described encoder.
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| WO2010069249A1 (en) * | 2008-12-16 | 2010-06-24 | 华为技术有限公司 | Method, device and user equipment for false alarm verification |
| CN101789820B (en) * | 2008-11-28 | 2013-05-29 | 美商威睿电通公司 | Device, method and system for multicarrier wireless communication |
| CN103957083A (en) * | 2014-05-16 | 2014-07-30 | 江苏中兴微通信息科技有限公司 | Method and device for improving robustness of signaling frame transmission |
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| CN103957083A (en) * | 2014-05-16 | 2014-07-30 | 江苏中兴微通信息科技有限公司 | Method and device for improving robustness of signaling frame transmission |
| CN103957083B (en) * | 2014-05-16 | 2018-05-15 | 江苏中兴微通信息科技有限公司 | A kind of method and device for improving signaling frame transmission robustness |
| CN111599300A (en) * | 2020-06-19 | 2020-08-28 | 京东方科技集团股份有限公司 | Signal processing method, signal transmitting and receiving device, and display device |
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