CN103379610A - Method and device for estimating signal to noise ratio by utilizing dual antennas - Google Patents
Method and device for estimating signal to noise ratio by utilizing dual antennas Download PDFInfo
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- CN103379610A CN103379610A CN2013101669210A CN201310166921A CN103379610A CN 103379610 A CN103379610 A CN 103379610A CN 2013101669210 A CN2013101669210 A CN 2013101669210A CN 201310166921 A CN201310166921 A CN 201310166921A CN 103379610 A CN103379610 A CN 103379610A
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Abstract
The embodiments of the invention generally relate to a method and a device for estimating signal to noise ratio (SNR) by utilizing dual antennas. The method comprises receiving signals through the dual antennas, determining whether a combined test is required for each signal, calculating the SNR of the signal after combined test if one signal is determined to subject a combined test, and combining the SNR of each signal to obtain a final SNR. Correspondingly, the invention further provides a device for estimating SNR by utilizing dual antennas. SNR can be accurately estimated and improved to control power and further improve a TD-SCDMA system.
Description
The cross reference of related application
The application requires the priority of the 61/640th, No. 185 U.S. Provisional Application submitting on April 30th, 2012, and its disclosure mode by reference all is incorporated into this.
Technical field
The embodiments of the present invention relate generally to communication technical field, and more specifically, relate to a kind of method and apparatus be used to utilizing double antenna estimated snr (SNR).
Background technology
Flourish along with 3G (Third Generation) Moblie (3G) technology and system, TD SDMA (TD-SCDMA) technology is widely used as one of core standard of 3G technology.Existing TD-SCDMA terminal adopts the single antenna reception technique mostly.Yet, in the mobile communication of reality, because the existence of multipath reflection a plurality of signal stacks of out of phase can occur, thereby cause the utmost point drastic change that receives signal amplitude at the receiving terminal place of terminal, have a strong impact on the demodulation performance of terminal.Especially at cell edge, terminal does not have ability antagonism deep fade or with frequently, this causes network throughput to become very poor.
Because the TD-SCDMA system is the self-interference system, therefore reducing transmitting power can improve power system capacity, directly affect simultaneously the performance of power control owing to the quality of SNR, so the traditional demodulation method in the TD-SCDMA system is by carrying out power control to the detection of SNR.And then it is particularly important for improving the TD-SCDMA system to carry out power control by accurate estimation SNR and lifting SNR.
Summary of the invention
One of purpose of each illustrative embodiments of the present invention is to provide a kind of method and apparatus be used to utilizing the double antenna estimated snr.
According to some execution mode of one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, for example can comprise: use double antenna Receiving signal; Determine whether to carry out joint-detection for each road signal; If determine that one road signal demand carries out joint-detection, then after described joint-detection, calculate the signal to noise ratio of described road signal; And the signal to noise ratio of inciting somebody to action each road signal as calculated merges as final signal to noise ratio.
Some execution mode according to one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, has wherein determined whether to carry out joint-detection for each road signal and can comprise that the restituted signal by detecting in described each road signal determines whether to carry out joint-detection.
Some execution mode according to one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine that each road signal all needs to carry out joint-detection, then calculate the signal to noise ratio of A road signal and be designated as SNR_A, and calculate the signal to noise ratio of B road signal and be designated as SNR_B.
Some execution mode according to one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine only have one road signal demand to carry out joint-detection, then calculates the signal to noise ratio of described road signal and as described final signal to noise ratio.
Some execution mode according to one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, the signal to noise ratio of wherein inciting somebody to action each road signal as calculated merges and can comprise: judge that whether described SNR_A is greater than described SNR_B, if described SNR_A, then calculates SNR_A/SNR_B greater than described SNR_B and is designated as SNR_RAB; And if described SNR_A is not more than described SNR_B, then calculates SNR_B/SNR_A and be designated as SNR_RBA; Whether judge described SNR_RAB/SNR_RBA greater than predetermined threshold M, if described SNR_RAB greater than described predetermined threshold M, then with described SNR_A as described final signal to noise ratio; If described SNR_RBA is greater than described predetermined threshold M, then with described SNR_B as described final signal to noise ratio; And if described SNR_RAB/SNR_RBA is not more than described predetermined threshold M, then with described SNR_A and described SNR_B summation as final signal to noise ratio.
According to some execution mode of one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, wherein said predetermined threshold M can be greater than 1.
According to some execution mode of one aspect of the invention, a kind of method be used to utilizing the double antenna estimated snr is provided, wherein said signal can be same down link signal.
Some execution mode according to a further aspect of the invention provides a kind of equipment be used to utilizing the double antenna estimated snr, for example can comprise: receiving system is configured to use double antenna Receiving signal; Determine device, be configured to determine whether to carry out joint-detection for each road signal; Calculation element if be configured to determine that one road signal demand carries out joint-detection, then calculates the signal to noise ratio of described road signal after described joint-detection; And the merging device, be configured to signal to noise ratio with as calculated each road signal and merge as final signal to noise ratio.
Some execution mode according to a further aspect of the invention, a kind of equipment be used to utilizing the double antenna estimated snr is provided, has wherein determined whether to carry out joint-detection for each road signal and can comprise that the restituted signal by detecting in described each road signal determines whether to carry out joint-detection.
Some execution mode according to a further aspect of the invention, a kind of equipment be used to utilizing the double antenna estimated snr is provided, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine that each road signal all needs to carry out joint-detection, then calculate the signal to noise ratio of A road signal and be designated as SNR_A, and calculate the signal to noise ratio of B road signal and be designated as SNR_B.
Some execution mode according to a further aspect of the invention, a kind of equipment be used to utilizing the double antenna estimated snr is provided, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine only have one road signal demand to carry out joint-detection, then calculates the signal to noise ratio of described road signal and as described final signal to noise ratio.
Some execution mode according to a further aspect of the invention, a kind of equipment be used to utilizing the double antenna estimated snr is provided, the signal to noise ratio of wherein inciting somebody to action each road signal as calculated merges and comprises: judge that whether described SNR_A is greater than described SNR_B, if described SNR_A, then calculates SNR_A/SNR_B greater than described SNR_B and is designated as SNR_RAB; If described SNR_A is not more than described SNR_B, then calculates SNR_B/SNR_A and be designated as SNR_RBA; Whether judge described SNR_RAB/SNR_RBA greater than predetermined threshold M, if described SNR_RAB greater than described predetermined threshold M, then with described SNR_A as described final signal to noise ratio; If described SNR_RBA is greater than described predetermined threshold M, then with described SNR_B as described final signal to noise ratio; And if described SNR_RAB/SNR_RBA is not more than described predetermined threshold M, then with described SNR_A and described SNR_B summation as final signal to noise ratio.
Some execution mode according to a further aspect of the invention provides a kind of equipment be used to utilizing the double antenna estimated snr, and wherein said predetermined threshold M can be greater than 1.
Some execution mode according to a further aspect of the invention provides a kind of equipment be used to utilizing the double antenna estimated snr, and wherein said signal can be same down link signal.
The embodiments of the present invention are accurately estimated SNR and promote SNR by double antenna Receiving mechanism to carry out power control, it is advantageous that: (1) terminal adopts two antennas to receive, can effectively utilize the space diversity gain between different antennae to resist multipath effect, thereby improve the receptivity of terminal, the user who improves cell edge experiences; (2) can significantly improve the stability that SNR estimates, thereby improve the performance of power control, and realize simple; And (3) can significantly strengthen network performance, and need not network is carried out any transformation.
Description of drawings
Also with reference to following detailed description, the feature of each execution mode of the present invention, advantage and other aspects will become more obvious by reference to the accompanying drawings, wherein:
Fig. 1 shows conventional single-antenna and receives structured flowchart;
Fig. 2 shows according to the flow chart of exemplary embodiment of the invention for the method for utilizing the double antenna estimated snr;
Fig. 3 shows according to the block diagram of exemplary embodiment of the invention for the equipment that utilizes the double antenna estimated snr;
The double antenna that Fig. 4 shows according to exemplary embodiment of the invention receives structured flowchart;
Double antenna SNR when Fig. 5 shows and all does joint-detection according to the two paths of data of exemplary embodiment of the invention estimates and the power control flow chart;
Fig. 6 show according to exemplary embodiment of the invention only circuit-switched data needs are done joint-detection the time double antenna SNR estimate and the power control flow chart; And
Fig. 7 indicative icon will from exemplary embodiment of the invention, be benefited and can be the block diagram of the portable terminal of exemplary embodiment of the invention exemplary device.
Embodiment
Below with reference to some illustrative embodiments principle of the present invention and spirit are described.Should be appreciated that providing these execution modes only is for those skilled in the art can being understood better and then realize the present invention, and be not to limit the scope of the invention by any way.
Fig. 1 shows conventional single-antenna and receives structured flowchart.Wherein, illustrate traditional demodulation method for the TD-SCDMA system.The method is calculated the data of a plurality of code channels of mixing by joint-detection, obtains the transmission symbol on each code channel, and the symbol transition that then will need to decode is that soft bit is sent to decoder module and decodes, thereby obtains information bit.After joint-detection, carry out SNR and estimate, the SNR that estimates is sent to power control (APC) module is used for power control.But at multipath reflection serious zone or cell edge, the single antenna terminal demodulation performance is relatively poor, and this has seriously limited user's data throughout.Because multipath reflection causes the big ups and downs of SNR that the performance of power control is reduced, and the single antenna terminal device-restrictive network coverage, and output power in base station proposed requirements at the higher level, thereby increased the base station construction cost.
Fig. 2 shows according to the flow chart of exemplary embodiment of the invention for the method 200 of utilizing the double antenna estimated snr.As shown in Figure 2, in frame S201, use double antenna Receiving signal.
In an illustrative embodiments, portable terminal can use the same down link signal of double antenna Receiving.One of ordinary skill in the art will readily recognize that the terminal of using dual-antenna diversity to receive can overcome the complicated transmission environment of mobile communication well, take full advantage of the multipath signal energy in the transmission, and then improve the demodulation performance of terminal.
According to an illustrative embodiment of the invention, in frame S202, determine whether to carry out joint-detection for each road signal.
In an illustrative embodiments, wherein determine whether to carry out joint-detection for each road signal and can comprise that the restituted signal by detecting in described each road signal determines whether to carry out joint-detection.Particularly, the signal that is sent by the base station can comprise data-signal and restituted signal.For each road signal, portable terminal can detect wherein restituted signal (for example, training sequence) to determine whether and need to carry out joint-detection to this road signal by channel estimating.If do not need this road signal is carried out joint-detection, then this road signal abandoned.
According to an illustrative embodiment of the invention, in frame S203, if determine that one road signal demand carries out joint-detection, then after described joint-detection, calculate the signal to noise ratio of described road signal.
In an illustrative embodiments, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine that each road signal all needs to carry out joint-detection, then calculate the signal to noise ratio of A road signal and be designated as SNR_A, and calculate the signal to noise ratio of B road signal and be designated as SNR_B.
In an illustrative embodiments, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection can comprise if determine only have one road signal demand to carry out joint-detection, then calculates signal to noise ratio and the final signal to noise ratio of conduct of this road signal.
According to an illustrative embodiment of the invention, in frame S204, the signal to noise ratio of as calculated each road signal is merged as final signal to noise ratio.
In an illustrative embodiments, the signal to noise ratio of wherein inciting somebody to action each road signal as calculated merges and can comprise: whether judge described SNR_A greater than described SNR_B, if described SNR_A, then calculates SNR_A/SNR_B greater than described SNR_B and is designated as SNR_RAB; And if described SNR_A is not more than described SNR_B, then calculates SNR_B/SNR_A and be designated as SNR_RBA; Whether judge described SNR_RAB/SNR_RBA greater than predetermined threshold M, if described SNR_RAB greater than described predetermined threshold M, then with described SNR_A as described final signal to noise ratio; If described SNR_RBA is greater than described predetermined threshold M, then with described SNR_B as described final signal to noise ratio; And if described SNR_RAB/SNR_RBA is not more than described predetermined threshold M, then with described SNR_A and described SNR_B summation as final signal to noise ratio.
In an illustrative embodiments, wherein said predetermined threshold M can be greater than 1.One of ordinary skill in the art will readily recognize that described predetermined threshold M can for example be preseted based on statistics by system, is perhaps manually set by user and/or system manager.
Fig. 3 indicative icon each execution mode is used for utilizing the block diagram of the equipment 300 of double antenna estimated snr according to the present invention.Equipment 300 for example can comprise receiving system 301, is configured to use double antenna Receiving signal; Determine device 302, be configured to determine whether to carry out joint-detection for each road signal; Calculation element 303 if be configured to determine that one road signal demand carries out joint-detection, then calculates the signal to noise ratio of described road signal after described joint-detection; And merge device 304, be configured to signal to noise ratio with as calculated each road signal and merge as final signal to noise ratio.
For the purpose of clear, also not shown each installs the sub-device that comprises in Fig. 3.Yet, should be appreciated that the device of record in the equipment 300 is with corresponding with reference to the step in the method 200 of figure 2 descriptions respectively.Thus, device and sub-device that the operation of above describing for the method 200 of Fig. 2 and feature are equally applicable to equipment 300 and wherein comprise do not repeat them here.
Should be appreciated that equipment 300 can utilize variety of way to realize.For example, in some embodiments, equipment 300 can utilize software and/or firmware module to realize.In addition, equipment 300 also can utilize hardware module to realize.For example, equipment 300 can be implemented as integrated circuit (IC) chip or application-specific integrated circuit (ASIC) (ASIC).Equipment 300 also can be implemented as SOC (system on a chip) (SOC).In addition, equipment 300 also can utilize the combination of hardware module and software and/or firmware module to realize.Other modes known or in the future exploitation also are feasible now, and scope of the present invention is unrestricted in this regard.
The double antenna that Fig. 4 shows according to exemplary embodiment of the invention receives structured flowchart.Particularly, in dual-antenna terminal shown in Figure 4, use two-way that down link signal is carried out diversity reception.Wherein each road receives with the single channel reception of Fig. 1 similar, carry out separately channel estimating and joint-detection, select again the employed convergent-divergent of two-way (scaling) parameter (401), separate afterwards mapping and process (402,405), then carrying out the soft bit of two-way merges (403) and then can improve terminal demodulation performance, the processing (404) of decoding at last.
After two-way carries out joint-detection separately, carry out respectively first SNR and estimate (406,407), then calculate the ratio (408) of larger SNR and less SNR, judge that whether this ratio is greater than threshold value M.If greater than threshold value M, can think then that wherein one the tunnel may be subject to the impact of deep fade or serious multipath reflection and causes lower SNR, and another road SNR is relatively good.The SNR of at this moment selective reception matter measured one tunnel transmits as the final SNR of this time slot and to power control module (APC), then APC uses this SNR to carry out downlink signal power control (409), soft bit does not afterwards need to merge yet, and only chooses this circuit-switched data and decodes.If two-way SNR ratio, thinks then that two paths of data can merge processing less than threshold value M, two-way SNR addition as the final SNR of this time slot, and is sent it to power control module and is used for power control.If only have one the tunnel need to do joint-detection, then SNR directly makes the result of the passage that is used as joint-detection.The method can greatly improve stability and the accuracy that SNR estimates, has improved the performance of power control, and has realized that simply complexity is little.
SNR when Fig. 5 shows and all does joint-detection according to the two paths of data of exemplary embodiment of the invention estimates and the flow chart of Poewr control method.
As shown in Figure 5, suppose that two paths of data is called as respectively A road and B road.At first, whether two paths of data is needed to do joint-detection judge, if need to carry out joint-detection, then after detecting end, calculate respectively the SNR on A road and B road, and it is designated as respectively SNR_A and SNR_B; If do not need to carry out joint-detection, then it abandoned; Afterwards, SNR_A and SNR_B are compared.
If SNR_A, then calculates the value of SNR_A/SNR_B greater than SNR_B and it is designated as SNR_RAB; Afterwards, this SNR_RAB and threshold value M are compared; If SNR_RAB is greater than threshold value M, then with the final SNR of SNR_A as this time slot; If SNR_RAB is less than threshold value M, then with SNR_A and the SNR_B sum final SNR as this time slot; Then this SNR value is sent to power control module and be used for downlink signal power control.
Be not more than SNR_B if in the step that SNR_A and SNR_B are compared, obtain SNR_A, then calculate the value of SNR_B/SNR_A and it is designated as SNR_RBA; Afterwards, SNR_RBA and threshold value M are compared; If SNR_RBA is greater than threshold value M, then with the final SNR of SNR_B as this time slot; If SNR_RBA is less than threshold value M, then with SNR_A and SNR_B sum as the final SNR of this time slot; Then this SNR value is sent to power control module and be used for downlink signal power control.
Fig. 6 show according to exemplary embodiment of the invention only circuit-switched data needs are done joint-detection the time SNR estimate and the flow chart of Poewr control method.
As shown in Figure 6, suppose that two paths of data is called as respectively A road and B road, wherein joint-detection need to be carried out and the A road does not need to carry out joint-detection in the B road.Determine that at first the A road does not need to do joint-detection; Determine that the B road is to do joint-detection; After joint-detection is carried out on the B road, calculate the SNR on B road and it is designated as SNR_B; Then send SNR_B to power control module as the final SNR of this time slot and be used for downlink signal power control.
By mentioned above, the major advantage that it will be appreciated by those skilled in the art that each execution mode of the present invention is: (1) terminal adopts two antennas to receive, can effectively utilize the space diversity gain between different antennae to resist multipath effect, thereby improve the receptivity of terminal, the user who improves cell edge experiences; (2) can significantly improve the stability that SNR estimates, thereby improve the performance of power control, and realize simple; (3) can significantly strengthen network performance, and need not network is carried out any transformation.
Below with reference to Fig. 7, it shows the schematic block diagram of the portable terminal 700 that is suitable for putting into practice embodiment of the present invention.In the example depicted in fig. 7, portable terminal 700 is the mobile devices with wireless communication ability.Yet, be appreciated that this only is exemplary and nonrestrictive.The portable terminal of other types also can easily adopt embodiments of the present invention, such as voice and the text communication system of portable digital-assistant (PDA), beep-pager, mobile computer, mobile TV, game station, laptop computer, camera, video tape recorder, GPS equipment and other types.Fixed portable terminal can easily use embodiments of the present invention equally.
Be appreciated that processor 712 comprises the required circuit of function of realizing portable terminal 700.For example, processor 712 can comprise digital signal processor device, micro processor device, various analog to digital converter, digital to analog converter and other support circuit.The control of portable terminal 700 and signal processing function distribute betwixt according to these equipment ability separately.Processor 712 carries out convolutional encoding and the function that interweaves to message and data before can also being included in thus modulation and transmission.Processor 712 can also comprise internal voice coder in addition, and can comprise internal data modem.In addition, processor 712 can comprise the function that one or more software programs that can be stored in the memory are operated.For example, processor 712 can operate linker, such as traditional Web browser.Linker can allow portable terminal 700 such as transmitting and receiving web content (such as location-based content and/or other web page contents) according to WAP (wireless application protocol) (WAP), HTML (Hypertext Markup Language) (HTTP) etc. then.
Particularly, display screen 728 can comprise touch-screen and/or contiguous formula screen, and the user can pass through the direct control screen and operating mobile terminal 700.At this moment, display screen 728 serve as simultaneously input equipment and output equipment the two.In such execution mode, handwriting equipment 731 can dispose for receiving the user by for example common pen, special-purpose stylus and/or the input that provides at display screen 728 is provided, comprise to give directions and input and the gesture input.
In addition, portable terminal 700 can comprise such as the interface equipment of joystick or other and is used for input interface.Portable terminal 700 also comprises battery 734, such as the vibrating battery group, is used to the required various circuit supplies of operating mobile terminal 700, and provides alternatively mechanical oscillation as detecting output.
Should be appreciated that the described structured flowchart of Fig. 7 illustrates just to the purpose of example, rather than limitation of the scope of the invention.In some cases, can increase or reduce as the case may be some equipment.
Should be noted that embodiments of the present invention can realize by the combination of hardware, software or software and hardware.Hardware components can utilize special logic to realize; Software section can be stored in the memory, and by suitable instruction execution system, for example microprocessor or special designs hardware are carried out.Those having ordinary skill in the art will appreciate that above-mentioned equipment and method can and/or be included in the processor control routine with computer executable instructions realizes, for example such as the mounting medium of disk, CD or DVD-ROM, provide such code such as the programmable memory of read-only memory (firmware) or such as the data medium of optics or electronic signal carrier.Equipment of the present invention and module thereof can be by such as very lagre scale integrated circuit (VLSIC) or gate array, realize such as the semiconductor of logic chip, transistor etc. or such as the hardware circuit of the programmable hardware device of field programmable gate array, programmable logic device etc., also can use the software of being carried out by various types of processors to realize, also can by the combination of above-mentioned hardware circuit and software for example firmware realize.
Although should be noted that some devices or the sub-device of having mentioned equipment in above-detailed, this division only is not enforceable.In fact, according to the embodiment of the present invention, the feature of above-described two or more devices and function can be specialized in a device.Otherwise, the feature of an above-described device and function can Further Division for to be specialized by a plurality of devices.
In addition, although described in the accompanying drawings the operation of the inventive method with particular order,, this is not that requirement or hint must be carried out these operations according to this particular order, or the operation shown in must carrying out all could realize the result of expectation.On the contrary, the step of describing in the flow chart can change execution sequence.Additionally or alternatively, can omit some step, a plurality of steps be merged into a step carry out, and/or a step is decomposed into a plurality of steps carries out.
Although described the present invention with reference to some embodiments, should be appreciated that the present invention is not limited to disclosed embodiment.The present invention is intended to contain interior included various modifications and the equivalent arrangements of spirit and scope of claims.The scope of claims meets the most wide in range explanation, thereby comprises all such modifications and equivalent structure and function.
Claims (14)
1. method that is used for utilizing double antenna estimated snr (SNR) comprises:
Use double antenna Receiving signal;
Determine whether to carry out joint-detection for each road signal;
If determine that one road signal demand carries out joint-detection, then after described joint-detection, calculate the signal to noise ratio of described road signal; And
The signal to noise ratio of as calculated each road signal is merged as final signal to noise ratio.
2. method according to claim 1 wherein determines whether to carry out joint-detection for each road signal and comprises that the restituted signal by detecting in described each road signal determines whether to carry out joint-detection.
3. method according to claim 1, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection comprises if determine that each road signal all needs to carry out joint-detection, then calculate the signal to noise ratio of A road signal and be designated as SNR_A, and calculate the signal to noise ratio of B road signal and be designated as SNR_B.
4. method according to claim 1, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection comprises if determine only have one road signal demand to carry out joint-detection, then calculates the signal to noise ratio of described road signal and as described final signal to noise ratio.
5. method according to claim 3, the signal to noise ratio of each road signal that wherein will be as calculated merges and comprises:
Whether judge described SNR_A greater than described SNR_B,
If described SNR_A, then calculates SNR_A/SNR_B greater than described SNR_B and is designated as SNR_RAB; And
If described SNR_A is not more than described SNR_B, then calculates SNR_B/SNR_A and be designated as SNR_RBA;
Whether judge described SNR_RAB/SNR_RBA greater than predetermined threshold M,
If described SNR_RAB is greater than described predetermined threshold M, then with described SNR_A as described final signal to noise ratio;
If described SNR_RBA is greater than described predetermined threshold M, then with described SNR_B as described final signal to noise ratio; And
If described SNR_RAB/SNR_RBA is not more than described predetermined threshold M, then described SNR_A and described SNR_B are sued for peace as final signal to noise ratio.
6. method according to claim 5, wherein said predetermined threshold M is greater than 1.
7. the described method of any one in 6 according to claim 1, wherein said signal is same down link signal.
8. equipment that is used for utilizing double antenna estimated snr (SNR) comprises:
Receiving system is configured to use double antenna Receiving signal;
Determine device, be configured to determine whether to carry out joint-detection for each road signal;
Calculation element if be configured to determine that one road signal demand carries out joint-detection, then calculates the signal to noise ratio of described road signal after described joint-detection; And
Merge device, be configured to signal to noise ratio with as calculated each road signal and merge as final signal to noise ratio.
9. equipment according to claim 8 wherein determines whether to carry out joint-detection for each road signal and comprises that the restituted signal by detecting in described each road signal determines whether to carry out joint-detection.
10. equipment according to claim 8, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection comprises if determine that each road signal all needs to carry out joint-detection, then calculate the signal to noise ratio of A road signal and be designated as SNR_A, and calculate the signal to noise ratio of B road signal and be designated as SNR_B.
11. equipment according to claim 8, if determine that wherein one road signal demand carries out joint-detection, the signal to noise ratio of then calculating described road signal after described joint-detection comprises if determine only have one road signal demand to carry out joint-detection, then calculates the signal to noise ratio of described road signal and as described final signal to noise ratio.
12. equipment according to claim 10, the signal to noise ratio of wherein inciting somebody to action each road signal as calculated merges and comprises:
Whether judge described SNR_A greater than described SNR_B,
If described SNR_A, then calculates SNR_A/SNR_B greater than described SNR_B and is designated as SNR_RAB;
If described SNR_A is not more than described SNR_B, then calculates SNR_B/SNR_A and be designated as SNR_RBA;
Whether judge described SNR_RAB/SNR_RBA greater than predetermined threshold M,
If described SNR_RAB is greater than described predetermined threshold M, then with described SNR_A as described final signal to noise ratio;
If described SNR_RBA is greater than described predetermined threshold M, then with described SNR_B as described final signal to noise ratio; And
If described SNR_RAB/SNR_RBA is not more than described predetermined threshold M, then described SNR_A and described SNR_B are sued for peace as final signal to noise ratio.
13. equipment according to claim 12, wherein said predetermined threshold M is greater than 1.
14. the described equipment of any one in 13 according to claim 8, wherein said signal is same down link signal.
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| US201261640185P | 2012-04-30 | 2012-04-30 | |
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