CN1126313C - Diversity receiver for merging vector weighted by coefficient being inversly proportional to deviation angle - Google Patents
Diversity receiver for merging vector weighted by coefficient being inversly proportional to deviation angle Download PDFInfo
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- CN1126313C CN1126313C CN 99119010 CN99119010A CN1126313C CN 1126313 C CN1126313 C CN 1126313C CN 99119010 CN99119010 CN 99119010 CN 99119010 A CN99119010 A CN 99119010A CN 1126313 C CN1126313 C CN 1126313C
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- China
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- angle
- signal
- diversity
- diversity branch
- branch circuit
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Abstract
To provide a diversity radio comprising a simple circuit configuration and a software configuration which suppress gradation in an error rate due to fluctuation in a received electric field and to provide the diversity radio method. A phase detection section 3 places restriction on amplitudes of plural reception signals received by two antennas or over to extract phase information. A synthesis section 5 provides a weight to phase information from at least one antenna, based on reception power information R2 and phase information &theta 4 from the antennas and applies vector synthesis to the signals. Thus, the synthesis section 5 applies three-dimensional synthesis to the signals by using the reception power information R2, the phase information &theta 4 and a phase weighting angle &phiv to correct at error caused by fluctuation in a reception electric field. A decoding section 7 decodes the received signal, based on synthesized phase information &theta sum6 from the synthesis section 5 to obtain decoded data 8. Through the configuration above, degradation in an error rate due to fluctuation in the reception electric field is suppressed.
Description
Technical field
The present invention relates generally to diversity receiver, particularly the diversity combining method of the complex vector of diversity branch from the uncorrelated signal of aerial array.
Background technology
Conventional diversity receiver has several types, and wherein one type is that the maximum ratio celebrated with its good signal-to-noise performance merges.Usually digital signal processor is used to realize such diversity receiver.For fear of adopting expensive DSP (Digital Signal Processing) circuit, the diversity receiver that the enough digital circuits cheaply of a kind of energy realize is disclosed among the Japanese patent laid-open 7-307724.
Change if field intensity takes place in transmission path, thereby the error in diversity branch is that significantly a strong out-of-phase signal may be produced by an antenna, and another antenna produces weak in-phase signal.The shortcoming of the diversity receiver of the prior art is if this strong out-of-phase signal becomes a governing factor, and then it can be put the diversity combined signal mutually from the signal of the phasor of system and draw back.This causes the sensitivity step-down of receiver to incoming call.
Summary of the invention
Therefore purpose of the present invention provides a kind of diversity receiving technology, and it can use digital circuit realization cheaply, and can stand the variation of field intensity.
According to first aspect, the invention provides a kind of diversity receiver, it comprises: be used to detect a plurality of antennas and a plurality of diversity branch circuit that is associated with this antenna respectively that the signal of being modulated by a digital signal also therefrom produces a plurality of mutual incoherent aerial signals.The amplitude normalization of the signal that provides from associated antenna is provided each diversity branch circuit, determine and a deviation angle that reference angle is relative from this normalized signal, produce the vector component of a pair of inphase quadrature and the angle weighting coefficient that is inversely proportional to and changes with this deviation angle, and the weighting of vector is provided by this angle weighting coefficient.Diversity combiner merges the weight vectors of all diversity branch circuit, and therefrom determines a merging angle.Decision circuit receives this merging angle and produces the copy of digital signal.
According to second aspect, the invention provides the method that a kind of diversity merges the mutual incoherent aerial signal of being modulated by a digital signal, wherein this aerial signal is associated with diversity branch respectively.This diversity combining method comprises the steps: the amplitude normalization to each aerial signal, from the normalized signal of each aerial signal, determine and a deviation angle that reference angle is relative, for each diversity branch produces the vector component of a pair of inphase quadrature and the angle weighting coefficient that is inversely proportional to and changes with this deviation angle, with the vector weighting of this angle weighting coefficient to each diversity branch, the weight vectors of all diversity branch circuit is merged, and therefrom determine a merging angle, and merge the copy that angle produces digital signal from this.
Description of drawings
Following mask body describes the present invention with reference to the accompanying drawings, wherein:
Fig. 1 is the block diagram according to the diversity receiver of first embodiment of the invention; And
Fig. 2 is the curve chart that concerns between expression skew phase angle and the weighting angle.
Embodiment
Referring now to Fig. 1, diversity receiver according to an embodiment of the invention shown in it.This diversity receiver comprises an aerial array 1-1 to 1-k, is used to receive RF (radio frequency) signal of digital modulation, for example the QPSK of π/4 phase shifts (four phase shift keys) signal.The diversity branch circuit 2-1 to 2-k that a plurality of circuit are identical is connected respectively to antenna 1.At a distance of certain interval, make that their output signal is uncorrelated mutually between the antenna 1.Each diversity branch circuit 2 produces the sine and the cosine component of a pair of tributary signal.Diversity combiner (or vector combiner) 3 is connected to diversity branch circuit 2, to merge the output of diversity branch circuit 2, the phase signal that is merged is offered a decision circuit 4.
More particularly, each diversity branch circuit comprises a down converter 10, and wherein the RF signal is converted into IF (intermediate frequency) signal of complex values.The amplitude of homophase of this IF signal (I) and quadrature (Q) component is limited, or by an amplitude limiter 11 normalization.Be used for detecting by phase detectors 12 and deviation angle θ between the reference signal points on the 360 degree circumference of the phasor of phase shift keyed signal by the complex values of amplitude limiter 11 normalized signals.
Consider a polar coordinate system, or the IQZ space, wherein vector is represented by amplitude R and angle θ and φ, and wherein φ is a vector and as the angle between the Z axle of the normal on IQ plane.Because this polar coordinate system must be converted into orthogonal coordinate system before the diversity branch signal is merged by diversity combiner 3, this vector projects on the IQ plane, produces following equation:
I
n＝R
nsinφ
ncosθ
n (1)
Q
n＝R
nsinφ
nsinθ
n (2)
Z
n＝R
ncosφ
n (3)
Wherein n is 1,2 ..., k.Therefore, the combined vector that gets from the merging of diversity branch vector is provided by following formula:
(∑I
n，∑Q
n，∑Z
n)
＝(∑R
nsinφ
ncosθ
n，∑R
nsinφ
nsinθ
n，∑R
ncosφ
n) (4)
Because the final decision at phase angle determines that on the IQ plane vector of gained is provided by following equation:
(∑I
n，∑Q
n)
＝(∑R
nsinφ
ncosθ
n，∑R
nsinφ
nsinθ
n) (5)
Therefore, the angle θ of gained vector
SumBe expressed from the next:
θ
sum＝tan
-1(∑R
nsinφ
ncosθ
n/∑R
nsinφ
nsinθ
n) (6)
Each diversity branch circuit 2 comprises a read-only memory 13, is used for skew phase angle θ is converted to a pair of cos θ and sin θ, and they are provided for multiplier 14 and 15 respectively.Provide a field intensity detector 16 in addition, it is from the field intensity of IF input by the signal that associated antenna received, and received signal intensity indication (RSSI) signal of this amplitude of generation expression R.
Signal R is used as the amplitude weight coefficient in multiplier 14 and 15, be used for cos-θ and the sin-θ vector output signal of weighting ROM 13.
Read-only memory 13 also produces the sin φ that is inversely proportional to and changes with skew phase angle θ.This sin-φ is used as the phase weighting coefficient in multiplier 14 and 15, be used for weighting cos-θ and sin-θ vector signal.Therefore, multiplier 14 and 15 output signal are represented by equation (1) and (2) respectively.
Diversity combiner 3 comprises: be used for the in-phase component of all diversity branch circuit is sued for peace to provide an output signal ∑ I
nAdder 17, and be used for the summation of the quadrature component of all diversity branch circuit to provide an output signal ∑ Q
nAdder 18.Division circuit 19 is the output of the output of adder 17 divided by adder 18, to produce phase angle θ
Sum
Decision circuit 4 is according to detected phase angle, the fixed phase angle θ of phasor
Sum, and the copy of recovery original digital signal.
Because the QPSK signal of π/4 phase shifts has on 360 degree phasors 45 degree, 8 signals at interval point mutually, be included in to phasing point one side+45 degree points and the scopes between-45 degree points of opposite side for the decision threshold of given signaling point.The decision threshold of this given signaling point is by setting up with these 90 ° of judgement scopes of 11.25 ° of five equilibriums.
As shown in Figure 2,0 °, ± 11.25 °, ± 22.5 °, ± 33.75 ° and ± 45.0 ° phase deviation angle θ is mapped to the weighting angle φ of 90 °, 67.5 °, 45.0 °, 22.5 ° and 0 ° respectively.
Because it is signaling point that 0 ° skew is put mutually, then is set as the maximum weighted angle that equals 90 ° in the φ of this some value.And ± 45 ° skew phase shift is positioned on the boundary line of adjacent judgement scope.In order to guarantee to distinguish this adjacent judgement scope clearly, the φ value at these some places is set as and equals 0 minimum weighting angle.The intermediate value of weighting angle φ is assigned to the complementary angle of skew phase angle theta, the variation that is inversely proportional to of the distance between φ and θ to 90 ° like this.
Owing to always have 32 weighting angle φ, each weighting angle is by 5 coded representation.Therefore, phase detectors 12 generations 5 digit numerical code are represented this skew phase angle θ.In ROM 13,0 °, ± 11.25 °, 22.5 °, ± 5 deviation angles of 33.75 ° and ± 45.0 ° are converted to 5 codes of sin90 °, sin67.5 °, sin45.0 °, sin22.5 ° and sin0 ° respectively.
Therefore, by weighting control of the present invention as can be seen, this diversity combined signal is no longer because the strong signal of out-phase arrives an antenna place, and other antenna departs from it when producing homophase weak signal and judges the angle.
Therefore diversity receiver of the present invention can be allowed variation and the error that takes place in the signal strength signal intensity of diversity branch, so the decision errors rate of this diversity receiver can remain on the acceptable level consistently.
In addition, diversity receiver can realized with the conventional diversity receiver behind simple the change aspect the hardware and software.
Improve among the embodiment at one of the present invention, diversity merges utilization skew phase information and carries out, and this realizes by in equation (6) Rn=1 being set.Therefore, equation (6) can be rewritten as:
θ
sum＝tan
-1(∑sinφ
ncosθ
n/∑sinφ
nsinθ
n) (7)
Can not produce error from the power level change of aerial signal because equation (7) means, therefore this improved diversity receiver is compared with a last embodiment and is had good reception sensitivity.But, to improve among the embodiment at this, phase information must be with quantizing than the more figure place of a last embodiment.In this improved diversity receiver, as if do not need the field intensity detector among Fig. 1.
Claims (6)
1. diversity receiver, comprising:
Be used to detect a plurality of antennas that the signal of being modulated by a digital signal also therefrom produces a plurality of mutual incoherent aerial signals;
A plurality of diversity branch circuit that are associated with described antenna respectively, the amplitude normalization of the signal that provides from associated antenna is provided each described diversity branch circuit, determine and a deviation angle that reference angle is relative from this normalized signal, produce the vector component of a pair of inphase quadrature and the angle weighting coefficient that is inversely proportional to and changes with described deviation angle, and by this angle weighting coefficient to vector weighting;
Diversity combiner is used for the weight vectors of all described diversity branch circuit is merged, and therefrom determines a merging angle; And
Be used to receive the decision circuit that this merging angle also therefrom produces the copy of described digital signal.
2. diversity receiver according to claim 1 is characterized in that,
Each described diversity branch circuit field intensity detector is used to detect the signal strength signal intensity from associated antenna, and therefrom produces the amplitude weight coefficient, and by this amplitude weight coefficient to the weight vectors weighting.
3. diversity receiver according to claim 1 and 2 is characterized in that, described diversity combiner comprises:
Be used for first adder to the in-phase component summation of all described diversity branch circuit;
Be used for second adder to the quadrature component summation of all described diversity branch circuit; And
Be used for the output of first adder divided by the output of second adder to produce the division circuit at described merging angle.
4. a diversity merges the method for the mutual incoherent aerial signal of being modulated by a digital signal, and described aerial signal is associated with diversity branch respectively, and this method comprises the steps:
A) to the amplitude normalization of each aerial signal;
B) from the normalized signal of each aerial signal, determine and a deviation angle that reference angle is relative;
C) produce the vector component of a pair of inphase quadrature and the angle weighting coefficient that is inversely proportional to and changes with this deviation angle for each described diversity branch;
D) with the vector weighting of this angle weighting coefficient to each described diversity branch;
E) weight vectors of all described diversity branch circuit is merged, and therefrom determine a merging angle; And
F) produce the copy of described digital signal from this merging angle.
5. method according to claim 4 is characterized in that also comprising the steps:
Determine the intensity of the aerial signal of each described diversity branch, and therefrom produce the amplitude weight coefficient; And
By this amplitude weight coefficient to the weight vectors weighting.
6. according to claim 4 or 5 described methods, it is characterized in that step (e) comprises the steps:
To the in-phase component summation of all described diversity branch circuit, to produce a homophase combined vector;
To the quadrature component summation of all described diversity branch circuit, to produce a quadrature combined vector; And
This homophase combined vector divided by this quadrature combined vector, to produce described merging angle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP255346/1998 | 1998-09-09 | ||
| JP25534698A JP3543632B2 (en) | 1998-09-09 | 1998-09-09 | Diversity radio apparatus and diversity radio method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1248112A CN1248112A (en) | 2000-03-22 |
| CN1126313C true CN1126313C (en) | 2003-10-29 |
Family
ID=17277522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99119010 Expired - Fee Related CN1126313C (en) | 1998-09-09 | 1999-09-06 | Diversity receiver for merging vector weighted by coefficient being inversly proportional to deviation angle |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3543632B2 (en) |
| CN (1) | CN1126313C (en) |
| AU (1) | AU769743B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004054132A1 (en) * | 2002-12-09 | 2004-06-24 | Koninklijke Philips Electronics N.V. | Diversity receiver having cross coupled channel parameter estimation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0923178A (en) * | 1995-07-05 | 1997-01-21 | Matsushita Electric Ind Co Ltd | Diversity receiver |
| US5930305A (en) * | 1996-02-23 | 1999-07-27 | Northern Telecom Limited | Signal demodulation and diversity combining in a communications system using orthogonal modulation |
| JPH1028108A (en) * | 1996-07-11 | 1998-01-27 | Nec Corp | Synthetic diversity receiving system |
-
1998
- 1998-09-09 JP JP25534698A patent/JP3543632B2/en not_active Expired - Fee Related
-
1999
- 1999-09-06 CN CN 99119010 patent/CN1126313C/en not_active Expired - Fee Related
- 1999-09-08 AU AU47429/99A patent/AU769743B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JP3543632B2 (en) | 2004-07-14 |
| CN1248112A (en) | 2000-03-22 |
| JP2000091971A (en) | 2000-03-31 |
| AU769743B2 (en) | 2004-02-05 |
| AU4742999A (en) | 2000-03-16 |
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| C06 | Publication | ||
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Granted publication date: 20031029 Termination date: 20120906 |