CN101473549A - Apparatus and method for interference cancellation - Google Patents
Apparatus and method for interference cancellation Download PDFInfo
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- CN101473549A CN101473549A CNA2007800233936A CN200780023393A CN101473549A CN 101473549 A CN101473549 A CN 101473549A CN A2007800233936 A CNA2007800233936 A CN A2007800233936A CN 200780023393 A CN200780023393 A CN 200780023393A CN 101473549 A CN101473549 A CN 101473549A
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Abstract
An apparatus and method for interference cancellation using software or low speed hardware. Antenna signals are received and selected. After selection, interference cancellation processing is applied. In one embodiment, the signal is a spread spectrum signal and selection includes despreading the signal. In one example, the interference cancellation processing includes a phase rotation step and a magnitude manipulation step.
Description
The cross reference of related application
The application requires the U.S. Provisional Application No.60/815 that is entitled as " Low-cost methods for interferencecancellation in spread-spectrum systems (cost effective method that is used for the interference eliminated of spread spectrum system) " of submission on June 21st, 2006,666 preference, this application are transferred to this assignee and clearly include in this by reference.
The field
The disclosure relates generally to be used for the apparatus and method of interference eliminated.
Background
In wireless communication systems, disturbing from the signal of multiple source or multipath is common problem.Signal disturbs the signal quality that receiver is received to exert an influence.Interference eliminated is a kind ofly to be used to increase signal to noise ratio at the wireless receiver place and to improve technology to the detection and/or the decoding of this signal thus.
The various technology that are used for interference eliminated are used in wireless communication system.It is analyzed and handle to remove interference that these technology relate to the input signal sample flow.The new signal sample flow is being fed to receiver detection and/or decode logic subsequently so that it carries out additional treatments when recovering primary signal as a result.
A kind of technology that is used for interference eliminated comprises " minimum combination of antennas ".In " minimum combination of antennas " technology, will be from the inlet flow addition of a plurality of antennas with this combination from the mode of the signal in domination source with offseting.This reduces noise floor and makes the weak signal on the power level that originally is lower than under the noise floor become and can detect thus.
The method that another kind is used for interference eliminated comprises the power level that deducts with the various signal corrections connection of previous detected and/or decoding.This reduces noise floor similarly again and makes the weak signal on the power level that originally is lower than under the noise floor become and can detect thus.
These specification requirement inlet flows that are used for interference eliminated are processed before the signal despreading.For example, handle each sample carrying out interference eliminated before the signal despreading and force under the speed of---forming contrast---with kHz or Hz scope typically in the MHz scope.Hardware operation in the MHz scope is more complicated than the hardware operation in kHz or Hz scope usually, and more consumes cost.Before the signal despreading, carry out interference eliminated and also require to store the sample that this type of receives.In hardware, handle in the system of each sample therein, in hardware blocks, realize interference cancellation techniques.
Correspondingly, being provided for wherein the apparatus and method of the interference eliminated of processing speed in lower frequency ranges closes and needs.Correspondingly, be provided for wherein having minimum memory to require or do not have the apparatus and method of the interference eliminated of memory requirement to close need.In addition, being provided for wherein can be under the situation of not using hardware blocks realizing with software that the apparatus and method of the interference eliminated of interference eliminated are closed needs.
Summary
The apparatus and method that are used for interference eliminated are disclosed.According to an aspect, a kind of receiver system that is used to carry out interference eliminated comprises: preselected processing unit is used for processing signals; Be coupled to the selector of preselected processing unit, be used to select signal; And interference eliminator, be used for carrying out interference eliminated from the signal of selector output.In one embodiment, interference eliminator comprises the hardware cell that is used for signal is carried out interference eliminated.In another embodiment, hardware cell comprises phase module and amplitude module.In one embodiment, signal is a spread-spectrum signal, and selector is a despreader.In one embodiment, the coherent integration device is coupled to selector, so that the signal from selector output is carried out coherent integration.
According on the other hand, a kind of method that is used for interference eliminated comprises: preprocessed signal; Select signal; And after selecting signal, this signal is carried out interference elimination treatment.
Should be appreciated that to those skilled in the art according to following detailed description, other embodiment will become apparent, wherein show and describe each embodiment as illustration.Accompanying drawing and detailed description should be considered to illustrative rather than restrictive.
Description of drawings
Fig. 1 shows the block diagram of spread spectrum communication system.
Fig. 2 is the illustration that is used for the system that transmits and receives of spread-spectrum signal.
Fig. 3 and 4 shows the block diagram of receiver system.
Fig. 5 is the flow chart that is used to carry out interference eliminated.
Fig. 6 shows the use of the conventional dual-antenna system that is used for interference eliminated.
The example of the use of the dual-antenna system that Fig. 7 is that illustration is used for interference eliminated---adopt and after signal despreading and coherent integration antenna weighting takes place---.
Another example of the dual-antenna system that Fig. 8 is the interference eliminated that is used for Fig. 7---wherein antenna weighting being resolved into phase place rotation step and amplitude maneuvering sequence---.
Fig. 9 will adopt the effect of the interference eliminated that antenna weighting takes place and the curve chart that conventional interference cancellation scheme is made comparisons after signal despreading and coherent integration.
Describe in detail
The detailed description of setting forth below in conjunction with accompanying drawing is intended to the description as each embodiment of the present invention, only can put into practice embodiments of the invention and be not intended to expression.Each embodiment that describes in the disclosure only provides as example of the present invention or illustration, and should not be construed to and be better than or be better than other embodiment.The detail of well understanding of the present invention in order to provide is provided detailed description.Yet to those skilled in the art, the present invention need not these specific detail also can realize it being conspicuous.In some instances, well-known structure and equipment illustrate to avoid fuzzy notion of the present invention with the block diagram form.Acronym and other descriptive term be purpose and being used for convenience and clearly only, and is not intended to limit the scope of the invention.
Fig. 1 shows the block diagram of spread spectrum communication system 2, and wherein subscriber unit 3 receives a plurality of spread- spectrum signal 6a, 6b, 6c.Particularly, 3 receptions of subscriber unit are from the signal 6a of base station 4a.Subscriber unit 3 also meets the signal 6b that is caused from barrier 5 reflections by signal 6a.In addition, the subscriber unit receives the spread-spectrum signal 6c from base station 4b.Subscriber unit 3 can for example comprise mobile radio telecommunications phone, satellite radio telephone, radio communication PDA(Personal Digital Assistant) etc.In one embodiment, subscriber unit 3 comprises the receiver system that is used for received signal.Barrier 5 can be any structure near subscriber unit 3, such as building, bridge, billboard, automobile etc.
The technology that is used for interference eliminated is used in wireless communication system to remove interference signal.Fig. 2 is the illustration that is used for the system that transmits and receives 10 of spread-spectrum signal.Data/voice signal 11a is transfused to expander cell 12 together with predetermined pseudo noise code (PN sign indicating number).The spread-spectrum signal of being launched 13 is receiving by transmitting antenna 14 emissions and by reception antenna 16 subsequently.Expander cell 12 becomes to exceed the bandwidth of initial data/voice signal 11a with the broadened bandwidth of the spread-spectrum signal 13 launched.Receive that spread-spectrum signal 17 has the bandwidth identical with the spread-spectrum signal launched 13.Receive that spread-spectrum signal 17 is transfused to despreader unit 18 subsequently, latter's (in theory) restore data/voice signal 11a.Predetermined pseudo noise code (PN sign indicating number) also is transfused to despreader unit 18 to help restore data/voice signal 11a.Owing to interference and the noise introduced during the transmission, the output of despreader unit 19 (data/voice signal 11b) is not identical with data/voice signal 11a strictness.In one embodiment, disturb and to be alleviated so that recover data/voice signal 11a in output place of despreader 18 with least interference.Interference elimination treatment is carried out after despreader unit 18, so that utilize than low signal speed.Typically, the bandwidth of receiving spread-spectrum signal 17 is in the MHz scope, and this bandwidth is greater than the bandwidth of the despread signal 19 in kHz or Hz scope typically.By despread signal 19 is carried out interference eliminated, the hardware that is used for interference elimination treatment is operated with the despread signal speed in kHz or the Hz scope.
Fig. 3 is the block diagram of receiver system 20.Receiver system 20 comprises at least one antenna 21 and receiver unit 22a.Receiver unit 22a comprises the pre-selection process unit 23 that is used for carrying out signal processing before selecting.The example of this type of processing can include but not limited to amplification, bandpass filtering, down-conversion, amplitude limit and automatic gain control.Receiver unit 22a also comprises the selector unit 25 that is used to select to receive signal.The detail that is used to select receive the selector unit 25 of signal depends on employed multiple access technology and wireless propagation environment.For example, adopt the system of code division multiple access (CDMA) to use the PN sign indicating number to expand the bandwidth of receiving signal, and selector unit can be never to be used for desired signal and to disturb the despreader of selecting to receive signal.The selector unit of other form can comprise device when the dehop device is conciliate jumping.The structure that it will be appreciated by those skilled in the art that selector unit is not limited to example given herein, and will depend on employed multipath technology and wireless propagation environment.Receiver unit 22a also comprises the interference eliminator 27 that is used to handle interference eliminated.In one embodiment, interference eliminator 27 also carries out low-pass filtering, coherent integration, input and/or the dc biasing removes.In another embodiment, coherent integration device 29 (not shown) will carry out coherent integration from the signal of the output of selector unit 25 before interference eliminated.
In an embodiment shown in Fig. 4, receive that signal is a spread-spectrum signal.In this embodiment, receiver unit 22b comprises: be used to carry out the first despreading device processing unit 24 that first despreading is handled; Be used for despreading and receive the despreader unit 26 of spread-spectrum signal; And the back despreader processing unit 28 that is used to carry out back despreading processing.The example that first despreading is handled can include but not limited to amplification, bandpass filtering, down-conversion, amplitude limit and automatic gain control.In one embodiment, back despreader processing unit 28 comprises the interference eliminator 27 that is used to carry out interference elimination treatment.In one embodiment, back despreader processing unit 28 also carries out low-pass filtering, coherent integration, input and/or the dc biasing removes.
Each illustrative logical blocks described herein, module and circuit can be realized or execution with one or more processors.Processor can be such as microprocessor general processor, such as the application specific processor of digital signal processor (DSP) or any other hardware platform that can support software.Software should broadly be construed to any combination of presentation directives, data structure or program code, and it all is like this no matter quoting software, hardware, middleware, microcode or any other term.Alternatively, processor can be combination or its combination of application-specific integrated circuit (ASIC) (ASIC), programmable logic device (PLD), field programmable gate array (FPGA), controller, microcontroller, state machine, discrete hardware components.Each illustrative logical blocks described herein, module and circuit also can comprise the machine readable media that is used for storing software.Machine readable media also can comprise the carrier wave of one or more memory devices, transmission line or encoded data signal.
The linearity of interference eliminated and despreading process makes the processing of interference eliminated to carry out after despreading process, thereby reduces processing and the bandwidth requirement that is associated.By the part handled as the back despreading, under the bandwidth requirement that reduces, carry out interference eliminated, can use realization based on software, include but not limited to be called the pure software solution of " software radio ".In addition, can realize the back despread signal is carried out the hardware than low rate (it is more uncomplicated usually and cost is lower) of interference eliminated.
Fig. 5 is the flow chart that is used to carry out interference eliminated.In step 70, receive signal by at least one antenna.Subsequently, receive that signal is pretreated in step 72.In one example, in step 72, carry out antenna weighting as the part of pre-treatment step.In step 74, select signal.In one example, signal is a spread-spectrum signal, and wherein signal is selected to comprise this signal is carried out despreading.In step 76, signal is carried out interference elimination treatment to realize the recovery from the primary signal in source.
Fig. 6 shows the use of the conventional dual-antenna system 30 that is used for interference eliminated.Dual-antenna system 30 comprises first antenna 36 and second antenna 38, and two antenna skews each other spatially.In one example, suppose transmission sources 32 emission desired signal, and transmission sources 34 emission interference signals.Processing to the signal (desired signal and interference signal) that received by two antennas 36,38 is used to suppress interference signal and strengthens desired signal.By convention, use antenna weighting with spreading rate faster before handling carrying out despreading.Referring to Fig. 6, be used for the routine techniques of interference cancellation, it is heavy before will and being combined into a single stream 39 from two inlet flow despreadings of each antenna 36,38 inlet flow to be used restore one's right.In an illustration, subsequently single stream 39 is concerned with or non-coherent integration to recover primary signal.
The example of the use of the dual-antenna system 40 that Fig. 7 is that illustration is used for interference eliminated---adopt and after signal despreading and coherent integration antenna weighting takes place---.In one example, suppose transmission sources 42 emission desired signal, and transmission sources 44 emission interference signals.Processing to the signal (desired signal and interference signal) that received by two antennas 46,48 is used to suppress interference signal and strengthens desired signal.At this, after carrying out the despreading processing, use antenna weighting with the speed lower (typically in kHz or Hz scope) than spreading rate (typically in the MHz scope).Referring to Fig. 7, after despreading process, each stream is used for the antenna weighting of interference eliminated.In one embodiment, also before the antenna weighting process, use relevant or non-coherent integration.Subsequently, two streams are combined into a single stream 49.
On mathematics, the telegram in reply baric flow on the antenna A (36) can be expressed as i0+jq0, and the telegram in reply baric flow on the antenna B (38) can be expressed as i1+jq1.The sign indicating number that is used for signal that will be searched can be expressed as i2+jq2 (supposing that wherein each signal is by the CDMA class environment of a representation).In addition, suppose that the weight that will be applied to from the stream of each antenna is respectively a0+jb0 and a1+jb1.Attention: i0, q0, i1, q1, i2, q2 are the vectors of a certain length L, and for stationary channel, a0, b0, a1, b1 are constant on length L.For fading channel, parameter is usually with the rate variation of kHz or Hz.
Interference cancellation algorithm is called the operation of the exclusive weighting of antenna after certain N chip is carried out despreading and coherent integration, this can be expressed as follows on mathematics:
By utilizing algorithm of interference to have the linearity attribute, interference cancellation algorithm is carried out after the despreading processing has taken place.Because multiplication is combination, therefore the main body of summation can be rewritten into as follows:
In this example, N is selected to coherent integration across being not more than in 1 second magnitude.Therefore, a0, b0, a1 and b1 are constant on N.This simplification makes it possible to move to outside the summation with (a0+jb0) with (a1+jb1):
As shown in following formula, summation only is N the coherent integration on the chip, and need not any manipulation from interference cancellation process.Therefore, antenna is exclusive takes place after being weighted in signal despreading and correlation intergal.In one embodiment, interference eliminated can use software algorithm to realize.In another embodiment, can under low bandwidth of the interference cancellation scheme that takes place before signal despreading and the coherent integration and processing requirements, in hardware, realize interference eliminated than antenna weighting wherein.
In one embodiment, the interference cancellation algorithm is broken down into two components---phase place and amplitude.These two components can be used with the different phase of independent mode in signal processing as shown in Figure 8 by phase module and amplitude module.In one embodiment, the order of complex weighting shown in Fig. 8 is reversed and is led over the phase place rotation so that amplitude is handled.In the exemplary embodiment, utilize the phase place and the amplitude module that when carrying out the normal signal processing, have provided to influence interference eliminated.In one example, automatic gain control (AGC) unit amplitude that can be used to is handled, and circulator can be used to the phase place manipulation.
On mathematics, weight formula a0+jb0 can be equal to
A0[cos(tau0)+j*sin(tau0)]
Wherein
A0=a0/cos (arctan (b0/a0)) and tau0=arctan (b0/a0),
Similarly, weight formula a1+jb1 can be equal to
A1[cos(tau1)+j*sin(tau1)]
Wherein
A1=a1/cos (arctan (b1/a1)) and tau1=arctan (b1/a1)
Therefore, weight can be resolved into range parameter A0 and A1 respectively, and rotation parameter is resolved into tau0 and tau1 respectively.In one embodiment, realize multiplication and summation in conjunction with attribute.Difference in computational process is used rotation and amplitude operation, thereby makes it possible to utilize the existing design with independent AGC and circulator piece to carry out interference eliminated.
In an experiment, write the Matlab script and will adopt the effect of the interference eliminated that antenna weighting takes place and the curve chart that conventional interference cancellation scheme is made comparisons after signal despreading and coherent integration.Under situation about being without loss of generality, suppose additive white Gaussian noise (AWGN) environment.Under each channel disturbance situation, draw the sensitivity gain that comes from interference eliminated at two kinds of schemes.The result has been shown among Fig. 9, and as expected, the result of two kinds of interference cancellation schemes is identical.At this moment because: 1) as proving on mathematics, the signal energy that records is identical; What and 2) record always receives that power is directly from the smallest eigen that calculates in the same manner at two kinds of schemes.
It is in order to make any technical staff in this area all can make or use the present invention that above description to the disclosed embodiments is provided.Various modifications to these embodiment are obvious by those skilled in the art easily, and can be applied to other embodiment and can not break away from the spirit or scope of the present invention in this defined generic principles.
Claims (33)
1. receiver system that is used to carry out interference eliminated comprises:
Selector is used to select signal; And
Interference eliminator is used for carrying out interference eliminated from the described signal of described selector output.
2. receiver system as claimed in claim 1 is characterized in that, also comprises the preselected unit that is used to handle described signal.
3. receiver system as claimed in claim 1 is characterized in that described signal is a spread-spectrum signal.
4. receiver system as claimed in claim 3 is characterized in that described selector is a despreader.
5. receiver system as claimed in claim 2 is characterized in that, operates under the speed of described preselected processing unit in the MHz scope.
6. receiver system as claimed in claim 5 is characterized in that, operates under the speed of described interference eliminator in kHz or Hz scope.
7. receiver system as claimed in claim 1 is characterized in that, described interference eliminator comprises the software algorithm that is used for described signal is carried out interference eliminated.
8. receiver system as claimed in claim 1 is characterized in that, described interference eliminator comprises the software radio that is used for described signal is carried out interference eliminated.
9. receiver system as claimed in claim 1 is characterized in that, described interference eliminator comprises the hardware cell that is used for described signal is carried out interference eliminated.
10. receiver system as claimed in claim 9 is characterized in that described hardware cell comprises phase module and amplitude module.
11. receiver system as claimed in claim 10 is characterized in that, described phase module is a circulator.
12. receiver system as claimed in claim 10 is characterized in that, described amplitude module is automatic gain control (AGC) unit.
13. a receiver system that is used to carry out interference eliminated comprises:
Choice device is used to select signal; And
Interference blanking unit is used for carrying out interference eliminated from the described signal of described choice device output.
14. receiver system as claimed in claim 13 is characterized in that, also comprises the preselected processing unit that is used to handle described signal.
15. receiver system as claimed in claim 13 is characterized in that, described interference blanking unit comprises the software algorithm that is used for described signal is carried out interference eliminated.
16. receiver system as claimed in claim 13 is characterized in that, described interference blanking unit comprises the hardware cell that is used for described signal is carried out interference eliminated.
17. a receiver system that is used to carry out interference eliminated comprises:
Selector is used to select signal,
Be coupled to the coherent integration device of selector, be used for the described signal from described selector output is carried out coherent integration, and
Interference eliminator is used for carrying out interference eliminated from the described signal of described coherent integration device output.
18. receiver system as claimed in claim 17 is characterized in that, described selector is a despreader.
19. a method that is used for interference eliminated comprises:
Select signal, and
After selecting described signal, described signal is carried out interference elimination treatment.
20. method as claimed in claim 19 is characterized in that, also comprises with at least one antenna receiving described signal.
21. method as claimed in claim 19 is characterized in that, described signal is a spread-spectrum signal.
22. method as claimed in claim 21 is characterized in that, despreader is used to select described signal.
23. method as claimed in claim 19 is characterized in that, also is included in to select after the described signal and before described signal is carried out interference elimination treatment described signal to be carried out coherent integration.
24. method as claimed in claim 23 is characterized in that, interference elimination treatment is operated in kHz or Hz scope.
25. method as claimed in claim 19 is characterized in that, software algorithm is used to carry out interference eliminated.
26. method as claimed in claim 19 is characterized in that, software radio is used to carry out interference eliminated.
27. method as claimed in claim 19 is characterized in that, hardware cell is used to carry out interference eliminated.
28. method as claimed in claim 27 is characterized in that, described hardware cell comprises phase module and amplitude module.
29. method as claimed in claim 28 is characterized in that, described phase module is a circulator.
30. method as claimed in claim 28 is characterized in that, described amplitude module is automatic gain control (AGC) unit.
31. an embodiment can be comprised by computer-implemented machine readable media with the instruction repertorie of carrying out interference eliminated:
Be used to select the instruction of signal; And
Be used for after selecting described signal, described signal being carried out the instruction of interference elimination treatment.
32. machine readable media as claimed in claim 31 is characterized in that, described signal is a spread-spectrum signal.
33. machine readable media as claimed in claim 31 is characterized in that, also comprises being used for after selecting described signal and before described signal is carried out interference elimination treatment described signal being carried out the instruction of coherent integration.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81566606P | 2006-06-21 | 2006-06-21 | |
| US60/815,666 | 2006-06-21 | ||
| US11/766,035 | 2007-06-20 |
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| CN101473549A true CN101473549A (en) | 2009-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516485A (en) * | 2012-06-15 | 2014-01-15 | 华为技术有限公司 | Signal receiving anti-interference processing method and device based on multiple antennas |
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2007
- 2007-06-21 CN CNA2007800233936A patent/CN101473549A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516485A (en) * | 2012-06-15 | 2014-01-15 | 华为技术有限公司 | Signal receiving anti-interference processing method and device based on multiple antennas |
| CN103516485B (en) * | 2012-06-15 | 2017-04-26 | 华为技术有限公司 | Signal receiving anti-interference processing method and device based on multiple antennas |
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