CN1783860A - Transmitting and detecting method for transmitting special information needing no order - Google Patents
Transmitting and detecting method for transmitting special information needing no order Download PDFInfo
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- CN1783860A CN1783860A CN 200410098020 CN200410098020A CN1783860A CN 1783860 A CN1783860 A CN 1783860A CN 200410098020 CN200410098020 CN 200410098020 CN 200410098020 A CN200410098020 A CN 200410098020A CN 1783860 A CN1783860 A CN 1783860A
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Abstract
A method for transmitting special information without signaling includes dividing sub carrier group in channel according to the number of special information, after determining special information to be transmitted, processing data in corresponded sub carrier group and generating empty carrier in said group. Said invention realizes information transmission in time, such as modulation information transmission in AMC system, the data can be restored without loss.
Description
Technical field
The invention belongs to the field of information transmission in OFDM (hereinafter to be referred as the OFDM) system, relate to the transmission method of a small amount of specific information that companion data information is transmitted in the ofdm system.
Background technology
OFDM is a kind of sound communication technology of carrying out the effective information transmission in channel.This technology utilizes a plurality of subcarriers (sub-carrier frequency) parallel, the transmission low-rate data to realize the communication of high data rate.Its technical essential is that the Channel Transmission bandwidth is divided into the plurality of sub frequency band, uses the subcarrier transmitting data information of mutually orthogonal on each sub-band concurrently, utilizes the orthogonality of its each subcarrier at receiving terminal, isolates the data message of parallel transmission.
The OFDM technology successfully has been applied in many communication systems, for example, digital broadcasting (DAB) and Digital Television (DVB) the employing OFDM technology formulated by european telecommunications standards institute ETSI are the wireless transmission standards of air interface, and WLAN standard IEEE802.11 and wireless metropolitan area network standard IEEE802.16 have also adopted the OFDM technology in addition.
In communication system, between transmitting terminal and receiving terminal, to transmit a spot of specific information usually.The modulation system of Cai Yonging for example, the encoding rate of employing, the various forms of employing etc.
In ofdm communication system, the AMC technology is an important techniques branch.Actual wireless channel has two big characteristics: time-varying characteristics and fading characteristic.Time-varying characteristics are by the relative motion between terminal, reflector, the scattering object or only are because the slight change of transmission medium causes.Therefore, the stochastic variable that becomes when the channel capacity of wireless channel also is will maximally utilise channel capacity, and only making transmission rate also is an amount with the channel volume change, just makes code modulation mode have adaptive characteristic.Adaptive modulation and coding (AMC) is determined the capacity of current channel according to the situation of channel, determines suitable code modulation mode etc. according to capacity, so that send information to greatest extent, realizes than higher speed.
In existing system, transmitting terminal is normally notified receiving terminal relevant specific information by the transmission of signaling.In ofdm communication system, when having adopted the AMC modulation system, need to obtain the parameter of channel: under the FDD mode, the base station can obtain down channel quality by the feedback of channel; Under the TDD mode, the base station can directly obtain the quality of down channel by the measurement to up channel, thereby adjusts modulation parameter according to the quality of subchannel, and channel is fully utilized.But after having adjusted parameter at every turn, the base station all needs to notify relevant terminal to be modified to corresponding receive mode, lifting along with increase of number of subchannels purpose and change frequency, need the control information amount of transmission also just increasing, cause bigger waste of capacity, thereby offset to a great extent by promoting the capacity gain that modulation system obtains, under worst case, also may reduce original channel capacity.
Other specific informations for some, the encoding rate of Cai Yonging for example, also there are the problems referred to above in the various forms of employing etc. when transmitting.
Summary of the invention
The purpose of this invention is to provide a kind of method of transmission and detection that is used to transmit customizing messages that need not signaling.
For achieving the above object, a kind of sending method that is used to transmit customizing messages that need not signaling comprises step:
Number according to specific information in subchannel is divided sub carrier group;
Determined the specific information of required transmission when transmitting terminal after, in its corresponding sub carrier group, carry out data processing, and in this group, produce a unloaded ripple.
The present invention by to sending the processing of data, has realized the timely transmission of transmitting terminal information under the situation that does not have extraneous information to transmit, as the transmission of the modulation type information in the AMC system, and data message itself can be realized harmless the recovery.
Description of drawings
Fig. 1 is inventive embodiments 1 schematic diagram data;
Fig. 2 is inventive embodiments 2 schematic diagram datas.
Embodiment
Stress the transmission that how to realize specific information below.For being easy to explanation, suppose that here the specific information that will pass is a modulation system.In fact, adopt same principle, can also transmit the specific information of a lot of other kinds, as coded system etc.
Adopted n kind modulation system in the supposing the system, the planisphere of every kind of modulation system has A1 respectively, A2 ... .An constellation point.
When subchannel is divided, guarantee that the occupied sub-carrier number of each subchannel is not less than A1+A2+....+An so.
Transmitting terminal carries out following processing to the data that send in subchannel.Step is as follows:
1, in subchannel, mark off N group subcarrier.Number of sub carrier wave in each group equals (or greater than) A1, A2 ..An respectively.Difference corresponding modulating mode 1,2 ... n.
2, modulate and be placed on the subcarrier successively according to the data that selected modulation system will send.
3, according to the specific information that will pass, as the modulation system that is adopted, the correspondence group that selection will special processing.Suppose to adopt the modulation system k that Ak constellation point arranged, then select corresponding that group that is not less than Ak bar subcarrier that has, suppose its total Ax bar subcarrier.
4, the subcarrier number of establishing group selected in 3 is 0,1 ... .Ax-1 (annotate: no specific (special) requirements on the numbering, promptly be not required for ascending order or descending, so long as appoint, and have uniqueness to get final product.)。Obtain the numbering of its benchmark subcarrier by agreement, as be numbered 1.
5, obtain the modulating data on the benchmark subcarrier, promptly obtain initial data m, make z=(1+m+y) mod Ak that (can adopt " mould Ak " algorithm, " mould Ax " algorithm or other algorithms are example with " mould Ak " algorithm here! ), wherein, ' 1 ' is the numbering of benchmark subcarrier, ' y ' is the side-play amount of agreement, as the number between 0 to Ax-1, so z should be mapped as a subcarrier number, i.e. a number between 0 to Ax-1.
6, will be numbered data-moving on the subcarrier of z to benchmark subcarrier (in 4, subcarrier 1), on transmit.
7, be numbered on the subcarrier of z and will do not transmit any data.
Receiving terminal carries out following processing to the symbol that receives:
1, will carry out energy measuring through each bar carrier wave of the reception data behind the channel compensation, find out the minimum subcarrier of energy in the whole symbol, as the position of the unloaded ripple of judging.
2, judge which group the position of unloaded ripple belongs to.Because the specific information that passed as the modulation system that is adopted, is corresponding one by one with the group at unloaded ripple place, the specific information that decidable passed thus, the modulation system that adopts as transmitting terminal.
3, will contain the benchmark subcarrier in the group of unloaded ripple, as the subcarrier of supposing above 1, on the reception data-moving to unloaded ripple.
4, alternate position spike m=(z-1-y) modAk of reference position (as the subcarrier of supposing above 1) (supposes to adopt " mould Ak " algorithm in the position z of unloaded ripple and the group; ' y ' be the agreement side-play amount) be exactly the data m that originally will transmit on the benchmark subcarrier.Behind whole symbol demodulation, these data are added in the whole data symbol by the relevant position.
Embodiment
Below, be one and adopted BPSK, QPSK, the example of QAM16 modulation, the carrier number of every subchannel is designed to 2+6+16=24.
A is divided into 3 parts to 24 subcarriers:
Carrier wave 0-1 is one group, and 2-7 is one group, and 8-23 is one group.Length has exceeded the possible data number 24 16 of BPSK QPSKQAM16 respectively.
In the example below, 0,3,10 are set as the reference position of modulation system BPSK QPSK QAM16 respectively.The subcarrier number mode is a serial number.
B according to the modulation system of decision, handles the frequency domain symbol data.
Suppose side-play amount y=0.
If the data on the BPSK reference position are found in BPSK modulation, these data should be that { 0, among the 1} one is made as A.
Data on the MOD 2 of position (A+BPSK reference position+0) are placed on the BPSK reference position, and position (A+BPSK reference position+0) the MOD2 free time does not pass.
If the data on the QPSK reference position are found in QPSK modulation, these data should be that { 0,1,2, among the 3} one is made as A.
The data of position (A+QPSK reference position+0) MOD 4 are placed on the QPSK reference position, and position (A+QPSK reference position+0) the 4 reference position free time of MOD do not pass.
If the data on the QAM16 reference position are found in QAM16 modulation, these data should be that { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14, among the 15} one is made as A.
The data of position (A+QAM16 reference position+0) MOD 16 are placed on the QAM16 reference position, and position (A+QAM16 reference position+0) 16 free time of MOD do not pass.
Here suppose that having adopted QAM16, the data on the QAM16 reference position is 7 (0111).
The initial data schematic diagram of embodiment is seen Fig. 1 (a).
And adjusted data are for seeing Fig. 1 (b).
C normally sends adjusted data.
After the D receiving terminal extracts each sub-channel data and carries out channel compensation, seek the minimum subcarrier of energy,
Position judgment modulation system according to the minimum subcarrier of energy.That is, the position is
0, during 1}, then be judged as BPSK.
{ during 2-7}, then be judged as QPSK.
{ during 8-23}, then be judged as QAM16.
In this example, we will detect the minimum sub-carrier positions of energy is 17, thereby judges and adopted the QAM16 modulation system.
E is transferred to the data on the QAM16 reference position on the minimum position of this energy.
The data that should pass on the F reference position can obtain by the positional information among the D, and method is that this numerical value deducts corresponding reference position and side-play amount.
In this example,, deduct reference position 2, obtain data 7 by unloaded ripple position 9.If obtained negative, then carry out modulo operation and obtain corresponding positive number.
G carries out normal demodulation.The data that obtain among the F are placed on the corresponding reference position.Just can obtain original transmission data.
An example that is used to transmit code check commonly used is described below again
In communication system, code rate commonly used has 1/2,2/3,3/4 3 kinds.
Suppose fixedly to have adopted the QPSK modulation in the system, in three kinds of code checks, select.
Still adopt 22 subcarriers in the subchannel, suppose that carrier wave 0-3 is one group, carrier wave 6-9 is one group, and carrier wave 15-18 is one group, and the reference position is all selected article one carrier wave in the group for use.When adopting 1/2 code rate, in first group, produce the processing of unloaded ripple, when adopting 2/3 code rate, in second group, produce the processing of unloaded ripple, when adopting 3/4 code rate, 3/4 code rate has been adopted in the processing that produces unloaded ripple in the 3rd group in this example.
Shown in Fig. 2 (a), the operation that produces unloaded ripple betides the 3rd group.
Following subcarrier number is subcarrier number in the group.
Data on benchmark subcarrier 0 are binary value ' 10 ', and value is 2.Then the data-moving on the subcarrier number 2 to subcarrier 0, be that 2 subcarrier is changed to unloaded ripple then with reference numeral, can transmit then.
The result of Fig. 2 (b) after for a change.
At receiving terminal, carry out channel compensation after, in subchannel, make energy measuring, find the minimum point of energy, discovery is the 17th subcarrier, belongs to the 3rd group, so can make judgement, the code rate of employing is 3/4.
Carry out reduction of data work then.
With the data-moving on the benchmark subcarrier to unloaded ripple.And obtain the data that will transmit on the benchmark subcarrier by unloaded ripple and reference position difference 2.
So far, finished the transmission of transfer of data and code rate information.
Claims (11)
1. sending method that is used to transmit customizing messages that need not signaling comprises step:
Number according to specific information in subchannel is divided sub carrier group;
Determined the specific information of required transmission when transmitting terminal after, in its corresponding sub carrier group, carry out data processing, and in this group, produce a unloaded ripple.
2. in accordance with the method for claim 1, it is characterized in that described specific information is a modulation system.
3. by the described method of claim 2, it is characterized in that the number in described each sub carrier group is not less than the possible changing value number of the current modulation system that adopts.
4. in accordance with the method for claim 2, it is characterized in that, the constellation point of the planisphere of the modulation system that is adopted is mapped on the subcarrier in the sub carrier group of being divided one by one, therefore, require the interior number of sub carrier wave of subchannel to be not less than the number sum of the constellation point of the modulation system that is adopted.
5. in accordance with the method for claim 1, it is characterized in that producing unloaded ripple comprises:
Initial data m in obtaining organizing on the benchmark subcarrier;
By computing, the data-moving on the corresponding subcarrier number z is transmitted to the benchmark subcarrier, and the subcarrier number z free time.
6. in accordance with the method for claim 5, it is characterized in that the method that subcarrier number z produced adopts following algorithm, z=(b+m+y) MOD Ax, b is the numbering of benchmark subcarrier in the group, y is a pre-set deviant, MOD is a modulo operation, and Ax is the number of subcarrier in the group.
7. in accordance with the method for claim 1, it is characterized in that described specific information is a code check commonly used.
8. method that receives the described method of claim 1 comprises step:
After receiving terminal receives data, judge the position of unloaded ripple;
After obtaining specific information that transmitting terminal sends, and the data that send are reduced according to the position of unloaded ripple.
9. according to the method for claim 8, it is characterized in that the position of described unloaded ripple is the minimum subcarrier of energy.
10. in accordance with the method for claim 8, it is characterized in that the value of the specific information that the group correspondence at unloaded ripple place is transmitted.
11. in accordance with the method for claim 8, it is characterized in that described reduction of data comprises:
With the reception data-moving on the benchmark subcarrier of unloaded ripple place group to this zero load ripple;
The Position Number difference of unloaded ripple and benchmark subcarrier is exactly the data that original symbol will be transmitted on the benchmark subcarrier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410098020 CN1783860A (en) | 2004-12-03 | 2004-12-03 | Transmitting and detecting method for transmitting special information needing no order |
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| CN 200410098020 CN1783860A (en) | 2004-12-03 | 2004-12-03 | Transmitting and detecting method for transmitting special information needing no order |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801675A (en) * | 2011-05-25 | 2012-11-28 | 华为技术有限公司 | Method and system for transmitting indication information as well as method for receiving indication information and equipment |
| CN107395322A (en) * | 2014-11-14 | 2017-11-24 | 上海数字电视国家工程研究中心有限公司 | Coded modulation signaling generation method and analytic method |
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2004
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801675A (en) * | 2011-05-25 | 2012-11-28 | 华为技术有限公司 | Method and system for transmitting indication information as well as method for receiving indication information and equipment |
| WO2012159498A1 (en) * | 2011-05-25 | 2012-11-29 | 华为技术有限公司 | Method for transmitting instruction information, method for receiving instruction information, and apparatuses and systems thereof |
| CN102801675B (en) * | 2011-05-25 | 2014-10-08 | 华为技术有限公司 | Method and system for transmitting indication information as well as method for receiving indication information and equipment |
| CN107395322A (en) * | 2014-11-14 | 2017-11-24 | 上海数字电视国家工程研究中心有限公司 | Coded modulation signaling generation method and analytic method |
| CN107395322B (en) * | 2014-11-14 | 2020-06-09 | 上海数字电视国家工程研究中心有限公司 | Code modulation signaling generation method and analysis method |
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Open date: 20060607 |