CN102255840B - Demodulation method and device - Google Patents
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- CN102255840B CN102255840B CN201010179698.XA CN201010179698A CN102255840B CN 102255840 B CN102255840 B CN 102255840B CN 201010179698 A CN201010179698 A CN 201010179698A CN 102255840 B CN102255840 B CN 102255840B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03993—Noise whitening
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03375—Passband transmission
- H04L2025/03414—Multicarrier
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Abstract
The invention discloses a demodulation method and device. The method comprises the following steps: grouping service REs in resource elements (REs) on service signs in baseband frequency domain signals by a terminal to form service groups, calculating interference-reducing factors corresponding to each service group, multiplying estimated values of baseband frequency domain signals and/or signal channels corresponding to each service group by the interference-reducing factor corresponding to the service group, and demodulating the estimated values of baseband frequency domain signals and/or signal channels. According to the invention, the REs (resource element) on the service signs are grouped according to interference sources and interference types to mark the service RE-containing groups as service groups, the estimated values of baseband frequency domain signals and/or signal channels on REs in the corresponding service groups are multiplied by interference-reducing factors respectively, and the demodulation is performed by using the estimated values of baseband frequency domain signals and/or signal channels after interference reduction. The method and device disclosed by the invention can effectively improve the demodulation performance when service data is subjected to the interference of neighborhood areas, so as to improve the throughput of a system.
Description
Technical field
The present invention relates to OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technical field, relate in particular to a kind of demodulation method and device.
Background technology
For wireless communication system, its emission mode can be single-shot SIMO (the Single InputMultiple Output that receive more, the many output of single input), SIMO is a kind of form for the intelligent antenna technology of radio communication, adopt individual antenna transmitted signal on transmitter, multiple antennas receive signal on recipient, also can be MIMO (the Multi-input Multi-output of MIMO, multiple-input and multiple-output), MIMO is a kind of abstract mathematics model that is used for describing multi-aerial radio communication system, can utilize multiple antennas independent transmitted signal separately of transmitting terminal, simultaneously at receiving terminal with multiple antenna receptions and recover prime information.Existing mimo system is mainly divided into transmit diversity and two kinds of patterns of spatial reuse.
Terminal is in demodulating process, even if there is 1 bit mistake, also can think whole frame mistake, need network side to resend, if there is repeatedly mistake in demodulating process, will repeatedly retransmit, cause the waste of Internet resources, at present, can improve demodulation performance by improving encoder matrix, but effect is limited, the business datum receiving in terminal be interfered and interference type different, the demodulation performance of terminal decline will be very fast, cause traffic data demodulation mistake, this problem is more serious at present.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of demodulation method and device, the business datum receiving is interfered, improves demodulation performance in terminal.
For solving the problems of the technologies described above, a kind of demodulation method of the present invention, comprising:
Terminal is divided into groups to the business RE in the resource element on the service symbol in base band frequency-region signal (RE), be called service groups, calculate each service groups corresponding interference coefficient falls, by base band frequency-region signal corresponding each service groups and/or channel estimation value be multiplied by this service groups corresponding interference coefficient falls, and base band frequency-region signal and channel estimation value are carried out to demodulation.
Further, calculating the method for falling interference coefficient corresponding to each service groups comprises:
The average power of computing service group, use the pilot tone of the Serving cell of terminal to calculate the average signal power at this pilot tone place, according to the ratio of the average signal power of this average signal power and business, calculate the average signal power of each service groups, according to this average signal power and corresponding average power, calculate corresponding average noise interference power;
Selection reference group, respectively divided by the average noise interference power of each service groups, obtains the corresponding interference coefficient that falls by the average noise interference power of this benchmark group.
Further, terminal is according to the grouping at the quantity of the business RE in the numerical value of the average noise interference power of each service groups, each service groups or pilot tone place, Serving cell, selection reference group.
Further, calculating the method for falling interference coefficient corresponding to each service groups comprises:
The average power of computing service group;
Average power by the average power of the business RE place grouping of non-frequency pilot sign divided by each service groups, obtain each service groups corresponding interference coefficient falls.
Further, when terminal is divided into groups to the business RE in the RE on the service symbol in base band frequency-region signal, the business RE on the source being interfered and the identical service symbol of interference type is divided into one group.
Further, a kind of demodulating equipment, comprising: resource element grouping module, fall interference coefficient computing module, fall interference module and demodulation module, wherein:
Resource element grouping module, divides into groups for the business RE in the resource element to on the service symbol of base band frequency-region signal (RE), is called service groups, completes after grouping, sends a notification message to falling interference coefficient computing module;
Interference coefficient computing module falls, for receiving after notification message, calculate each service groups corresponding interference coefficient falls, and this is fallen to interference coefficient and sends to and fall interference module;
Fall interference module, for base band frequency-region signal corresponding each service groups and/or channel estimation value are multiplied by the interference coefficient that falls of this grouping correspondence, and this base band frequency-region signal and channel estimation value are sent to demodulation module;
Demodulation module, carries out demodulation for the base band frequency-region signal to receiving and channel estimation value.
Further, fall interference coefficient computing module calculate each service groups corresponding interference coefficient falls and time, the average power of computing service group, use the pilot tone of the Serving cell of terminal to calculate the average signal power at this pilot tone place, according to the ratio of the average signal power of this average signal power and business, calculate the average signal power of each service groups, according to this average signal power and corresponding average power, calculate corresponding average noise interference power, and selection reference group, by the average noise interference power of this benchmark group respectively divided by the average noise interference power of each service groups, obtain the corresponding interference coefficient that falls.
Further, interference coefficient computing module falls according to the grouping at the quantity of the business RE in the numerical value of the average noise interference power of each service groups, each service groups or pilot tone place, Serving cell, selection reference group.
Further, fall interference coefficient computing module calculate each service groups corresponding interference coefficient falls and time, calculate the average power of each grouping; Average power by the average power of the business RE place grouping of non-frequency pilot sign divided by each service groups, obtain each service groups corresponding interference coefficient falls.
Further, when resource element grouping module is divided into groups to the business RE in the RE on the service symbol in base band frequency-region signal, the business RE on the source being interfered and the identical service symbol of interference type is divided into one group.
In sum, the present invention is according to disturbing source and interference type to divide into groups to the RE on service symbol (resource element), the group that comprises business RE is designated as to service groups, respectively the base band frequency-region signal on RE in corresponding service group and/or channel estimation value are multiplied by one and fall interference coefficient, base band frequency-region signal and channel estimation value that employing is fallen after interference carry out demodulation, demodulation performance when the present invention can effectively improve business datum and is subject to adjacent area and disturbs, and then improve the throughput of system.
Brief description of the drawings
Fig. 1 is the flow chart of embodiment of the present invention demodulation method;
Fig. 2 is the structural representation of the descending middle Resource Block of LTE;
Fig. 3 is the schematic diagram of application example 1 of the present invention;
Fig. 4 is the schematic diagram of application example 2 of the present invention;
Fig. 5 is the Organization Chart of the demodulating equipment of embodiment of the present invention.
Embodiment
The thinking of present embodiment is, terminal converts the time-domain signal receiving to base band frequency-region signal, and by the resource element grouping in service symbol, because the source and the interference type that disturb cannot be known in advance, therefore analyze the interference being likely subject to, resource element in the service symbol identical with interference type of the source being interfered is divided into a service groups, in conjunction with falling accordingly interference coefficient, each service groups corresponding base band frequency-region signal and/or channel estimation value are processed accordingly, improve the quality of restituted signal, indirectly improve demodulation performance, present embodiment effect in the situation that only having partial service RE to be interfered is more obvious.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
Fig. 1 is the flow process of the demodulation method of present embodiment, comprising:
101: the time-domain signal receiving is converted to base band frequency-region signal by terminal, RE on the service symbol of base band frequency-region signal is divided into groups, because the source and the interference type that disturb cannot be known in advance, therefore analyze the interference being likely subject to, the RE (resource element) on the identical service symbol of be interfered source and interference type divided into groups;
Base band frequency-region signal is by RB (Resource block, Resource Block) composition, Fig. 2 shows a Resource Block, each RB is made up of RE, in figure, a lattice represents a RE, a business takies several RB, in Fig. 2, abscissa is symbol, one classifies a symbol as, and symbol is divided into service symbol and control character, the symbol that wherein comprises pilot tone can be described as again frequency pilot sign, being that frequency pilot sign can be service symbol, can be also control character, and the RE on service symbol can be divided into again business RE and pilot tone RE.In Fig. 2, symbol 1,5,8 and 12 is frequency pilot sign.Ordinate is subcarrier, i.e. subcarrier of a behavior.
Can divide into groups respectively to the business RE on service symbol and pilot tone RE, business RE is divided into one or more service groups, and pilot tone RE is divided into one or more pilot group.When interference coefficient falls in subsequent calculations, use pilot group to calculate the average signal power of pilot group, according to the ratio of the average signal power of the average signal power of business and pilot tone, derive the average signal power of service groups, according to the average power of every group and average signal power, thereby obtain the average noise interference power of every group, according to the average noise interference power of service groups or service groups average signal power, fallen accordingly interference coefficient.
RE on the service symbol of base band frequency-region signal is disturbed different, and interference type comprises: the Pilot Interference of adjacent cell and traffic interference.In the time that the RE on the non-frequency pilot sign in service symbol is interfered, the interference on these RE derives from the traffic interference that identical adjacent cell and interference type are adjacent cell, the RE in non-frequency pilot sign in service symbol can be divided into one group.When interference that all RE on frequency pilot sign are subject to, these interference derive from pilot tone or the traffic interference that different adjacent cells and interference type are adjacent cell, divide into groups, and the group that comprises business RE is called to service groups according to the actual conditions that are disturbed.
102: according to the average power of RE in service groups or average noise interference power, calculate the interference coefficient that falls of each service groups;
In present embodiment, can adopt several different methods to calculate and fall interference coefficient, as the average noise interference power (with reference to application example 1) of RE in the average power (with reference to application example 2) of RE in employing service groups or employing service groups.
While adopting the average noise interference power of service groups RE, use this district pilots to calculate average signal power and the average noise interference power at pilot tone place, according to the ratio of the average signal power of the average signal power of this district pilots and business, calculate the average signal power of each service groups, can calculate average noise interference power according to average signal power and average power, taking the business RE of non-frequency pilot sign as benchmark, and then interference coefficient is fallen accordingly.
While adopting the average power of every group of RE, interference coefficient, is fallen in average power with the average power of the grouping of the business RE of non-frequency pilot sign divided by each service groups accordingly.
If there are multiple reception antennas, the correspondence that multiple reception antennas can be calculated is fallen interference coefficient and is averaged, and as final coefficient, also can use the interference coefficient that falls calculating separately by multiple reception antennas.
103: base band frequency-region signal corresponding business RE and/or channel estimation value are multiplied by the interference coefficient that falls of business RE place grouping;
104: fall and disturb base band frequency-region signal after treatment and channel estimation value to send into MIMO demodulation module to carry out demodulation.
Application example 1:
Demodulation method taking two two mimo systems of receiving as example explanation present embodiment below, according to agreement regulation, is designated as category-B symbol by the service symbol containing pilot tone, is not designated as category-A symbol containing the service symbol of pilot tone, and as shown in Figure 3, the method comprises the steps:
301: the RE on the service symbol of base band frequency-region signal is divided into four groups by terminal;
As shown in Figure 2, on frequency pilot sign in service symbol, number 3 and the shared RE of pilot tone of numbering 0 the business RE Serving cell (being called this community) that is terminal, in the time that these RE are interfered, interference derives from pilot tone or the traffic interference that identical adjacent cell and interference type are adjacent cell, the RE of these two numberings is divided into one group, be designated as grouping 0, grouping 0 is pilot group.The transmitting antenna of supposing adjacent cell has two, and two, adjacent pilot frequencies RE interval subcarrier on same frequency pilot sign, so when numbering 1 and numbering 4 shared RE are while being interfered, disturb and derive from pilot tone or the traffic interference that identical adjacent cell and interference type are adjacent cell.In like manner number 2 and when numbering 5 shared RE suffered interference, interference derives from pilot tone or the traffic interference that identical adjacent cell and interference type are adjacent cell, therefore be divided into one group by numbering 1 on service symbol with the business RE of numbering 4, be designated as grouping 1, the business RE that numbers 2 and 5 on service symbol is divided into one group, be designated as grouping 2, and the business RE on non-frequency pilot sign on service symbol is divided into one group, be designated as grouping 3, wherein divide into groups 1, grouping 2 and grouping 3 comprise business RE, these groups are called service groups.
302: the average power PN that calculates every group of RE
i, wherein i represents group number;
The calculating of average power can adopt known method.
303: use this district pilots to calculate the average signal power PS of grouping 0
0with average noise-plus-interference power NI
0;
304: according to PN
i, PS
0and NI
0calculate the average noise interference power of grouping 1, grouping 2 and grouping 3;
Known power controlling elements ρ
aand ρ
b, its implication is shown in formula (1) and formula (2), wherein, and E
afor the average signal power of category-A symbol, numerical value and PS
3equate; E
bfor the average signal power of category-B symbol; E
rSfor the average signal power of this district pilots, numerical value and PS
0equate.Use formula (3) to calculate PS
3, be also the average signal power of category-A symbol; Use formula (4) to calculate the average noise interference power of category-A symbol; Utilize formula (5) to calculate the average noise interference power of the grouping 1 and 2 of category-B symbol.E
aand E
bbe referred to as the average signal power of business.
PS
3＝ρ
A×PS
0 (3)
NI
3＝PN
3-PS
3 (4)
NI
i＝PN
i-ρ
B×PS
3 i＝1，2 (5)
305: according to the quantity of business RE in the numerical value of the average noise interference power of each group or grouping, selection reference group, by the average noise interference power of benchmark group, respectively divided by the average noise interference power of each service groups, what correspondingly obtain service groups falls interference coefficient α;
As select the group of numerical value minimum of average noise interference power as benchmark group, maybe will in grouping, comprise the group that business RE is maximum, or the grouping at pilot tone place, Serving cell is as benchmark group.If elect groups maximum business RE as benchmark group, selecting grouping 3 is benchmark group.The computational methods of interference coefficient are fallen as formula (6).If using the grouping at pilot tone place, Serving cell as benchmark group, selecting grouping 0 is benchmark group, falls the computational methods of interference coefficient as shown in formula (7).
306: the interference coefficient that falls that base band the frequency-region signal corresponding RE of each service groups and channel estimation value is multiplied by this group;
307: fall and disturb base band frequency-region signal after treatment and channel estimation value to send into MIMO demodulation module to carry out demodulation.
Application example 2:
Two two mimo systems of receiving are that example describes another example of present embodiment below in conjunction with Fig. 4, comprising:
401: the RE on the service symbol of base band frequency-region signal is divided into seven groups by terminal;
The transmitting antenna of supposing adjacent cell is 1, five, adjacent pilot frequencies RE interval subcarrier on same frequency pilot sign, the adjacent cell Pilot Interference that pilot tone on the transmitting antenna of two of Gu Zhe communities is subject to can not derive from same adjacent cell, therefore, pilot tone on two transmitting antennas of Jiang Zhe community is divided into two groups, for pilot group, as shown in Figure 2, the RE on frequency pilot sign with identical numbering i is divided into and belongs to group i; Business RE on non-frequency pilot sign is group 6, wherein divides into groups 1, grouping 2, grouping 4, grouping 5 and grouping 6 be designated as service groups.
402: calculate the average power PN of every group
i, wherein i represents group number, i=0, and 1 ..., 6;
403: calculate the interference coefficient that falls of service groups on frequency pilot sign, as formula (8);
404: the interference coefficient that falls that base band the frequency-region signal corresponding RE of each service groups and channel estimation value is multiplied by this group;
405: fall and disturb base band frequency-region signal after treatment and channel estimation value to send into MIMO demodulation module to carry out demodulation.
Fig. 5 is the demodulating equipment of present embodiment, comprising: interconnective resource element grouping module, fall interference coefficient computing module, fall interference module and demodulation module, wherein:
Resource element grouping module, divides into groups for the business RE in the resource element on the service symbol of base band frequency-region signal (RE), is called service groups, completes after grouping, sends a notification message to falling interference coefficient computing module; When resource element grouping module is divided into groups to the business RE in the RE on the service symbol in base band frequency-region signal, the business RE on the source being interfered and the identical service symbol of interference type is divided into one group.
Interference coefficient computing module falls, for receiving after notification message, calculate each service groups corresponding interference coefficient falls, and this is fallen to interference coefficient and sends to and fall interference module;
Fall interference coefficient computing module calculate each service groups corresponding interference coefficient falls and time can adopt with the following method, 1) average power of computing service group, use the pilot tone of the Serving cell of terminal to calculate the average signal power at this pilot tone place, according to the ratio of the average signal power of this average signal power and business, calculate the average signal power of each service groups, according to this average signal power and corresponding average power, calculate corresponding average noise interference power, and selection reference group, by the average noise interference power of this benchmark group respectively divided by the average noise interference power of each service groups, obtain the corresponding interference coefficient that falls, 2) calculate the average power of each grouping, average power by the average power of the business RE place grouping of non-frequency pilot sign divided by each service groups, obtain each service groups corresponding interference coefficient falls.Interference coefficient computing module falls according to the grouping at the quantity of the business RE in the numerical value of the average noise interference power of each service groups, each service groups or pilot tone place, Serving cell, selection reference group.
Fall interference module, for base band frequency-region signal corresponding each service groups and/or channel estimation value are multiplied by the interference coefficient that falls of this grouping correspondence, and this base band frequency-region signal and channel estimation value are sent to demodulation module.
Demodulation module, carries out demodulation for the base band frequency-region signal to receiving and channel estimation value.
The present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. a demodulation method, comprising:
Terminal is divided into groups to the business RE in the resource element RE on the service symbol in base band frequency-region signal, be called service groups, calculate each service groups corresponding interference coefficient falls, by base band frequency-region signal corresponding each service groups and/or channel estimation value be multiplied by this service groups corresponding interference coefficient falls, and described base band frequency-region signal and channel estimation value are carried out to demodulation;
When described terminal is divided into groups to the business RE in the RE on the service symbol in base band frequency-region signal, the business RE on the source being interfered and the identical service symbol of interference type is divided into one group.
2. the method for claim 1, is characterized in that, the method for what the each service groups of described calculating was corresponding fall interference coefficient comprises:
Calculate the average power of described service groups, use the pilot tone of the Serving cell of described terminal to calculate the average signal power at this pilot tone place, according to the ratio of the average signal power of this average signal power and business, calculate the average signal power of each service groups, according to this average signal power and corresponding average power, calculate corresponding average noise interference power;
Selection reference group, respectively divided by the average noise interference power of each service groups, obtains the corresponding interference coefficient that falls by the average noise interference power of this benchmark group.
3. method as claimed in claim 2, is characterized in that:
Described terminal, according to the grouping at the quantity of the business RE in the numerical value of the average noise interference power of each service groups, each service groups or pilot tone place, Serving cell, is selected described benchmark group.
4. the method for claim 1, is characterized in that, the method for what the each service groups of described calculating was corresponding fall interference coefficient comprises:
Calculate the average power of described service groups;
Average power by the average power of the business RE place grouping of non-frequency pilot sign divided by each service groups, obtain each service groups corresponding interference coefficient falls.
5. a demodulating equipment, comprising: resource element grouping module, falls interference coefficient computing module, falls interference module and demodulation module, wherein:
Described resource element grouping module, divides into groups for the business RE in the resource element RE on the service symbol of base band frequency-region signal, is called service groups, completes after grouping, sends a notification message to the described interference coefficient computing module that falls;
The described interference coefficient computing module that falls, for receiving after described notification message, calculate each service groups corresponding interference coefficient falls, and this is fallen to interference coefficient and falls interference module described in sending to;
The described interference module of falling, for base band frequency-region signal corresponding each service groups and/or channel estimation value are multiplied by the interference coefficient that falls of this grouping correspondence, and sends to described demodulation module by this base band frequency-region signal and channel estimation value;
Described demodulation module, carries out demodulation for the base band frequency-region signal to receiving and channel estimation value;
When described resource element grouping module is divided into groups to the business RE in the RE on the service symbol in base band frequency-region signal, the business RE on the source being interfered and the identical service symbol of interference type is divided into one group.
6. device as claimed in claim 5, is characterized in that:
Described fall interference coefficient computing module calculate each service groups corresponding interference coefficient falls and time, calculate the average power of described service groups, use the pilot tone of the Serving cell of terminal to calculate the average signal power at this pilot tone place, according to the ratio of the average signal power of this average signal power and business, calculate the average signal power of each service groups, according to this average signal power and corresponding average power, calculate corresponding average noise interference power, and selection reference group, by the average noise interference power of this benchmark group respectively divided by the average noise interference power of each service groups, obtain the corresponding interference coefficient that falls.
7. device as claimed in claim 6, is characterized in that:
The described interference coefficient computing module that falls, according to the grouping at the quantity of the business RE in the numerical value of the average noise interference power of each service groups, each service groups or pilot tone place, Serving cell, is selected described benchmark group.
8. device as claimed in claim 5, is characterized in that:
Described fall interference coefficient computing module calculate each service groups corresponding interference coefficient falls and time, calculate the average power of described each grouping; Average power by the average power of the business RE place grouping of non-frequency pilot sign divided by each service groups, obtain each service groups corresponding interference coefficient falls.
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| CN103107962B (en) * | 2012-03-07 | 2014-08-20 | 展讯通信（上海）有限公司 | Method, device and system on chip (SOC) of obtaining and handling estimated value of sending signal |
| US9054837B2 (en) | 2012-12-31 | 2015-06-09 | Spreadtrum Communications (Shanghai) Co., Ltd. | Demodulation method and apparatus, decoding method and apparatus and baseband chip in communication system |
| US9077416B2 (en) | 2012-12-31 | 2015-07-07 | Spreadtrum Communications (Shanghai) Co., Ltd. | Method and apparatus for demodulating downlink channel in communication system and baseband chip |
| CN111770039B (en) * | 2020-07-29 | 2023-05-09 | Oppo广东移动通信有限公司 | Receiving device, terminal, demodulation processing method, device and storage medium |
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| CN101626255A (en) * | 2008-07-11 | 2010-01-13 | 大唐移动通信设备有限公司 | Method, system, device and terminal for eliminating interference |
| CN101540751A (en) * | 2009-04-30 | 2009-09-23 | 北京邮电大学 | Demodulating method for multi-stream data and system thereof |
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| CN102255840A (en) | 2011-11-23 |
| WO2011143859A1 (en) | 2011-11-24 |
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