CN105577298A - Adaptive phase detection method and system - Google Patents

Abstract

The present invention provides an adaptive phase detection method. The method includes the following steps that: adaptive control is carried out according to wireless channel quality information, so that parameter configuration of phase detection is obtained; phase detection is carried out according to the parameter configuration, and phase detection results are outputted; and an effective phase detection result is selected and outputted. According to the adaptive phase detection provided by the invention, an adaptive phase detection scheme which is low in computational complexity and has performance that satisfies requirements is selected; according to the wireless channel quality information, phase detection calculation is further simplified, or the parameter configuration of phase detection performance is improved; and therefore, the computational complexity and performance of the phase detection can be adaptively adjusted according to the change of wireless anycast environment.

Description

A kind of self adaptation method for detecting phases and system

Technical field

The present invention relates to communication technique field, particularly a kind of self adaptation method for detecting phases and system.

Background technology

In mobile communication system, radio signal propagation environment is very complicated, and the signal Hui Fenduotiao road that antenna for base station is launched is through arriving destination with the different moment, and every paths is all different to the amplitude of signal, phase effect.Therefore can utilize these independently or highly incoherent multiple signals to promote the performance of wireless link.Diversity technique is exactly that a kind of multiple signals that utilize are to promote the technology of radio link performance, use two or more root antenna transmits to mobile receiver in a base station, receiver receives the different editions of the same signal that different transmitting antenna sends, obviously can improve the impact of wireless propagation environment on signal after merging treatment, promote receptivity.In a wcdma system, have employed a kind of diversity technique being called closed-loop diversity mode.Base station adopts two transmit antennas to carry out transmit diversity, and mobile receiver uses a kind of feedback mechanism, first channel information is measured according to reception frequency pilot sign, then sending feedback information to transmitter indicates transmitter to adjust signal transmission phase place and the power of transmitting antenna, and receiver instantaneous received power is maximized.But in actual propagation environment, feedback channel is always reliable, and the feedback information that base station receives may exist mistake, therefore used adjustment phase place may different from desired by receiver, and this mismatch can cause the reduction of wireless performance.Therefore mobile receiver must obtain the phase adjustment value that transmits that base station uses, and namely obtains the phase place weights of antenna for base station.WCDMA system closed-loop diversity mode scheme as shown in Figure 1-2.Wherein, the phase place of a closed-loop diversity mode 1 adjustment antenna, the phase place of another root antenna does not adjust, and power does not also adjust, all the time mean allocation on two antennas.Suppose that the antenna being used for not doing phase place adjustment is antenna 1, the phase place weights of antenna 1 are w ₁, be constant value all the time antenna as phase place adjustment is antenna 2, and phase place weights are w ₂, its desirable 4 kinds of value: $\{\sqrt{2}/2+\sqrt{2}/2i,-\sqrt{2}/2+\sqrt{2}/2i,-\sqrt{2}/2-\sqrt{2}/2-\sqrt{2}/2i,\sqrt{2}/2-\sqrt{2}/2i\}.$ Receiver needs to carry out phase-detection and calculates the w obtaining each time slot base station antenna 2 and use ₂value.

Method for detecting phases conventional at present has a lot, provides a kind of verification scheme based on likelihood function, the first step in third generation communication system standard physical layer protocol, first structure inspection inequality:

$2\underset{i=1}{\overset{\mathrm{Npath}}{\mathrm{\Σ}}}\frac{1}{{\mathrm{\σ}}_i^2}\left\{\sqrt{2}\mathrm{Re}\left(\mathrm{\γ}{h}_{2,i}^{\left(h\right)}{h}_{2,i}^{{\left(p\right)}^{*}}\right)\right\}>\ln \left(\frac{\stackrel{\‾}{p}({\mathrm{\φ}}_{\mathrm{Rx}}=\mathrm{\π})}{\stackrel{\‾}{p}({\mathrm{\φ}}_{\mathrm{Rx}}=0)}\right)$

Wherein, Npath representative participates in the number of path of computing, the noise of the i-th paths and the gross power of interference.Real in bracket is got in Re (.) expression, and * represents the conjugation of getting plural number. the channel estimating using the special control physical channel of DPCCH to do the i-th paths from the second transmit antennas, it is the channel estimating using CPICH common pilot physical channel to do the i-th paths from second antenna.γ ²it is DPCH DPCH and the ratio of CPICH common pilot physical channel SNIR measured value.The right of inequality is the inspection likelihood function of 0 or π to signal phase.Defined variable x ₀, the phase estimation value that the base station representing receiver even timeslots feedback receives.If inequality is above set up, then x ₀=0, otherwise x ₀=π.

Second step, constructs another inspection inequality:

$-2\underset{i=1}{\overset{\mathrm{Npath}}{\mathrm{\Σ}}}\frac{1}{{\mathrm{\σ}}_i^2}\left\{\sqrt{2}\mathrm{Im}\left(\mathrm{\γ}{h}_{2,i}^{\left(h\right)}{h}_{2,i}^{{\left(p\right)}^{*}}\right)\right\}>\ln \left(\frac{\stackrel{\‾}{p}({\mathrm{\φ}}_{\mathrm{Rx}}=\mathrm{\π}/2)}{\stackrel{\‾}{p}({\mathrm{\φ}}_{\mathrm{Rx}}=-\mathrm{\π}/2)}\right)$

Wherein, Im (.) represents the imaginary part of getting plural number in bracket.Defined variable x ₁, the phase estimation value that the base station representing receiver odd numbered slots feedback receives.If above formula is set up, then x ₁=-pi/2, otherwise x ₁=pi/2.

3rd step, presses variable x with reference to table 1 ₀, x ₁with the corresponding relation of feedback slot, the inspection inequality according to the above-mentioned first step and second step estimates x to each time slot of 15 of a frame time slots ₀or x ₁.When calculating inspection inequality, the feedback phase information x ' on each time slot checking the acquisition of likelihood function value to need receiver this locality to store on the right of inequality ₀or x ' ₁, also need the priori error probabilities information of feedback channel, in agreement, be assumed to 4%.

Table 1

4th step, after estimating the base station receiving phase value of each time slot, by formula below, obtains base station second transmit antennas phase place weight w in above-mentioned 3rd step ₂estimated value:

$w_2=\frac{\underset{i=0}{\overset{1}{\mathrm{\Σ}}}\cos \left(x_i\right)}{\sqrt{2}}+j\frac{\underset{i=0}{\overset{1}{\mathrm{\Σ}}}\sin \left(x_i\right)}{\sqrt{2}}$

As can be seen from above-mentioned explanation, this method needs the SNIR measurement result using two kinds of physical channels in computational process, also needs the Noise and Interference gross power of every paths, and the inspection inequality left side also needs division arithmetic, every time slot all needs to upgrade above-mentioned calculated value, and complexity is higher.Simultaneously, likelihood function value on the right of inspection inequality employs a fixing priori error probabilities information 4%, but actual channel is complicated and changeable, and therefore feedback error probability is not a fixed value, use fixed value to affect detection perform, the change of wireless channel cannot be adapted to.

In addition, also have and use lattice shape algorithm to carry out phase-detection, although this algorithm better performances, need to calculate each node branch tolerance of each time slot, realize computation complexity higher, and result more accurately could be obtained after delay certain hour.Further, very there is the scheme for proposing in above-mentioned agreement to simplify, not considering the calculating that SNIR is relevant, only use the channel estimation value of physical channel to carry out phase-detection.The computation complexity of this kind of scheme reduces greatly, but it does not consider the feature of wireless propagation environment, such as SNIR and feedback priori error probabilities information etc., so its estimated performance is very large by the impact of wireless propagation environment, when channel circumstance is more severe, performance has obvious deterioration.It does not utilize the local feedback information value stored yet simultaneously, and also need the phase estimation of carrying out different quadrant to result of calculation, this can increase computation complexity further.Certainly, also have and propose simple and complicated Phase Detecting Device simultaneously, simple scheme is similar to the method that lattice shape algorithm proposes to carry out phase-detection, complex scenario proposes to assess the cost function to adjudicate phase adjustment value, the method that this scheme complexity and performance are all carried with above-mentioned agreement is close, but not contact, can not change between performance and computation complexity according to the change of wireless propagation environment is adaptive between it and simple scheme.

Summary of the invention

The object of the present invention is to provide a kind of self adaptation method for detecting phases and system, to solve the problem that existing detection method cannot take into account computation complexity and performance.

For solving the problems of the technologies described above, the invention provides a kind of self adaptation method for detecting phases, comprising:

The parameter configuration that adaptive control obtains phase-detection is carried out according to quality of wireless channel information;

Carry out phase-detection according to described parameter configuration and export phase detection result;

Effective phase detection result is selected to export.

Further, in described self adaptation method for detecting phases, described step of carrying out the parameter configuration of adaptive control acquisition phase-detection according to quality of wireless channel information comprises:

Quality of wireless channel information and n the first thresholding are compared, confirm the Phase Detecting Device that will select, n is positive integer.

Further, in described self adaptation method for detecting phases, after confirming the Phase Detecting Device that will select, also comprise step:

Quality of wireless channel information and n the second thresholding are compared, confirms desired parameter configuration in described Phase Detecting Device.

Further, in described self adaptation method for detecting phases, described quality of wireless channel information comprises Received signal strength and noise and noise power ratio, reception bit error rate and/or Block Error Rate.

Further, in described self adaptation method for detecting phases, described parameter configuration comprises multi-path information, physical channel receive data with and/or local store phase information.

Accordingly, the present invention also provides a kind of self adaptation phase detection, comprising:

Self-adaptive controller, obtains the parameter configuration of phase-detection for carrying out adaptive control according to quality of wireless channel information;

Phase detection unit, for carrying out phase-detection according to described parameter configuration and exporting phase detection result;

Testing result unit, exports for selecting effective phase detection result.

Further, in described self adaptation phase detection, described phase detection unit comprises several phase detecting module, all for carrying out phase-detection according to described parameter configuration and exporting phase detection result.

Further, in described self adaptation phase detection, described self-adaptive controller comprises:

First comparison module, for quality of wireless channel information and n the first thresholding being compared, confirm the Phase Detecting Device that will select, n is positive integer;

Further, in described self adaptation phase detection, described self-adaptive controller also comprises:

Second comparison module, for quality of wireless channel information and n the second thresholding being compared, confirms desired parameter configuration in described Phase Detecting Device.

Further, in described self adaptation phase detection, described quality of wireless channel information comprises Received signal strength and noise and noise power ratio, reception bit error rate and/or Block Error Rate.

Further, in described self adaptation phase detection, described parameter configuration comprises multi-path information, physical channel receive data with and/or local store phase information.

Self adaptation method for detecting phases provided by the invention and system, there is following beneficial effect: the present invention is according to quality of wireless channel information, selectivity satisfies the demands but the lower Phase Detecting Device of computation complexity, simultaneously also according to quality of wireless channel information, selection can simplify the parameter configuration that phase-detection calculates or improves phase-detection performance further, enables the computation complexity of phase-detection and performance carry out adaptive adjustment along with broadcasting the change of environment without line selection.

Accompanying drawing explanation

Fig. 1-2 is prior art WCDMA system closed-loop diversity mode schematic diagram;

Fig. 3 is the schematic flow sheet of self adaptation method for detecting phases of the present invention;

Fig. 4 is the schematic diagram of the embodiment of the present invention 1 self adaptation method for detecting phases.

Embodiment

The self adaptation method for detecting phases proposed the present invention below in conjunction with the drawings and specific embodiments and system are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.

As shown in Figure 3, the invention provides a kind of self adaptation phase detection and method, described self adaptation phase detection comprises self-adaptive controller, phase detection unit and testing result unit.

Self-adaptive controller is selected to meet current channel circumstance performance need according to quality of wireless channel information and the less Phase Detecting Device of computation complexity in existing Phase Detecting Device, then control the parameter configuration of selected Phase Detecting Device according to quality of wireless channel information, reduce computation complexity or improving performance further with this.Phase detection unit comprises several phase detecting module, each module can be thought and uses one independently Phase Detecting Device, according to the enable information that self-adaptive controller provides, they are determined whether oneself starts and carry out phase-detection, if started, then obtain the scheme that provides of self-adaptive controller and carry out phase-detection calculating, just not do any process if do not started.Finally, testing result unit selects instruction to read the testing result of corresponding phase detecting unit according to the Phase Detecting Device that self-adaptive controller provides, and exports as final phase detection result.

[embodiment 1]

As shown in Figure 4, the present embodiment adopts two kinds of alternative Phase Detecting Device: phase detecting module 1 adopts computation complexity lower, but performance is general, affects its computation complexity and the major parameter of performance is multipath number; Phase detecting module 2 adopts the scheme given by said physical layer protocol, better performances, but computation complexity is higher, affect its computation complexity and the major parameter of performance is also multipath number, its performance is also by the impact of priori feedback error probabilistic information simultaneously.

Self-adaptive controller obtains quality of wireless channel information Q, quality of wireless channel information mentioned here includes but not limited to Received signal strength and noise and noise power ratio (SNIR), receives bit error rate (BER) or Block Error Rate (BLER), and it also obtains the feedback phase information etc. that the general required multi-path information of phase-detection calculating, the related data receiving physical channel and this locality store simultaneously.That is, described quality of wireless channel information Q might not represent an information, may be the conbined usage of multiple channel quality information, when making comparisons with thresholding, may comprise multiple channel quality information side by side relatively or comprise and compare.Obtain real-time reception SNIR value and the BER value quality information as wireless channel in this embodiment.Work as SNIR>Q _th1time, use Phase Detecting Device 1, otherwise just use Phase Detecting Device 2.If use Phase Detecting Device 1, so judge SNIR>q _thwhether set up, set up and then choose 1 ~ 3 larger multipath of power and carry out phase estimation and calculate, otherwise choose all effective multipaths and carry out estimation calculating; If use Phase Detecting Device 2, judge BER>q ' _thwhether set up, set up and then can choose 1 ~ 3 larger multipath of power and carry out phase estimation and calculate, otherwise choose all effective multipaths and carry out estimations calculating, while, can also be improved priori feedback error probabilistic information and improved estimated performance further.Last testing result Unit selection part obtains effective phase detection result according to the instruction of used Phase Detecting Device and exports.

Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection range of claims.

Claims (11)

1. a self adaptation method for detecting phases, is characterized in that, comprising:

The parameter configuration that adaptive control obtains phase-detection is carried out according to quality of wireless channel information;

Carry out phase-detection according to described parameter configuration and export phase detection result;

Effective phase detection result is selected to export.

2. self adaptation method for detecting phases as claimed in claim 1, is characterized in that, described step of carrying out the parameter configuration of adaptive control acquisition phase-detection according to quality of wireless channel information comprises:

Quality of wireless channel information and n the first thresholding are compared, confirm the Phase Detecting Device that will select, n is positive integer.

3. self adaptation method for detecting phases as claimed in claim 2, is characterized in that, after confirming the Phase Detecting Device that will select, also comprise step:

Quality of wireless channel information and n the second thresholding are compared, confirms desired parameter configuration in described Phase Detecting Device.

4. self adaptation method for detecting phases as claimed in claim 1, is characterized in that, described quality of wireless channel information comprises Received signal strength and noise and noise power ratio, reception bit error rate and/or Block Error Rate.

5. self adaptation method for detecting phases as claimed in claim 1, is characterized in that, described parameter configuration comprises multi-path information, physical channel receive data with and/or locally store phase information.

6. a self adaptation phase detection, is characterized in that, comprising:

Self-adaptive controller, obtains the parameter configuration of phase-detection for carrying out adaptive control according to quality of wireless channel information;

Phase detection unit, for carrying out phase-detection according to described parameter configuration and exporting phase detection result;

Testing result unit, exports for selecting effective phase detection result.

7. self adaptation phase detection as claimed in claim 6, it is characterized in that, described phase detection unit comprises several phase detecting module, all for carrying out phase-detection according to described parameter configuration and exporting phase detection result.

8. self adaptation phase detection as claimed in claim 6, it is characterized in that, described self-adaptive controller comprises:

First comparison module, for quality of wireless channel information and n the first thresholding being compared, confirm the Phase Detecting Device that will select, n is positive integer.

9. self adaptation phase detection as claimed in claim 8, it is characterized in that, described self-adaptive controller also comprises: the second comparison module, for quality of wireless channel information and n the second thresholding being compared, confirms desired parameter configuration in described Phase Detecting Device.

10. self adaptation phase detection as claimed in claim 6, is characterized in that, described quality of wireless channel information comprises Received signal strength and noise and noise power ratio, reception bit error rate and/or Block Error Rate.

11. self adaptation phase detection as claimed in claim 6, is characterized in that, described parameter configuration comprises multi-path information, physical channel receive data with and/or local store phase information.