CN108040026A - A kind of sign synchronization and equalizer for bluetooth receiver - Google Patents
A kind of sign synchronization and equalizer for bluetooth receiver Download PDFInfo
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- CN108040026A CN108040026A CN201711264902.6A CN201711264902A CN108040026A CN 108040026 A CN108040026 A CN 108040026A CN 201711264902 A CN201711264902 A CN 201711264902A CN 108040026 A CN108040026 A CN 108040026A
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- equalizer
- fbe
- ffe
- backward
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The present invention provides a kind of sign synchronization and equalizer for bluetooth receiver, including：Symbol synchronizer circuit and equalizer based on Gardner algorithms, the symbol synchronizer circuit based on Gardner algorithms includes frequency discriminator, interpolation device, Timing Error Detection, loop filter and the interpolation controller being sequentially connected, and the output terminal of the interpolation controller is connected with the interpolation device；The equalizer includes forward equalizer FFE, adder, decision device and the backward balanced device FBE being sequentially connected, the output terminal of the backward balanced device FBE is connected with the adder, the forward equalizer FFE is connected with forward taps coefficient configurator, the backward balanced device FBE is connected with backward tap coefficient configurator, the present invention can overcome influence of the judgement balanced device to incoming symbol sampling phase sensitivity, decision feedback equalizer is got a desired effect.
Description
Technical field
The present invention relates to the digital baseband demodulator field of bluetooth receiver, and in particular to a kind of for bluetooth receiver
Sign synchronization and equalizer.
Background technology
At present, in the digital baseband demodulator of bluetooth receiver equalizer have to incoming symbol sampling phase it is certain
Sensitiveness, when carrier wave frequency deviation is not completely eliminated in the carrier recovery block of previous stage, it is impossible to normal work.
The content of the invention
The defects of in order to solve above-mentioned deficiency, the present invention provides a kind of sign synchronization for bluetooth receiver and equilibrium
Device circuit, by the way that before balanced device, data first pass through the completion sign synchronization based on Gardner algorithm Symbol Synchronization Circuits,
Influence of the judgement balanced device to incoming symbol sampling phase sensitivity can so be overcome, decision feedback equalizer is reached expected
Effect, and the bit error rate performance under Gaussian white noise channel can be obviously improved using the decision feedback equalizer, still
Increased circuit area is very small.
The present invention provides a kind of sign synchronization and equalizer for bluetooth receiver, including：
Symbol synchronizer circuit and equalizer based on Gardner algorithms, the symbol based on Gardner algorithms
Synchronizer circuit includes frequency discriminator, interpolation device, Timing Error Detection, loop filter and the interpolation controller being sequentially connected, institute
The output terminal for stating interpolation controller is connected with the interpolation device；The equalizer includes the forward equalizer being sequentially connected
FFE, adder, decision device and backward balanced device FBE, the output terminal of the backward balanced device FBE are connected with the adder, institute
State forward equalizer FFE and be connected with forward taps coefficient configurator, the backward balanced device FBE is connected with backward tap coefficient and matches somebody with somebody
Put device.
Above-mentioned circuit, wherein, the forward equalizer FFE be ffe_N ranks FFE balanced devices, wherein ffe_N be more than
1 integer.
Above-mentioned circuit, wherein, the backward balanced device FBE is the FBE balanced devices of fbe_N ranks, wherein fbe_N be more than
1 integer.
Above-mentioned circuit, wherein, the forward equalizer FFE and backward balanced device FBE filter for FIR finite impulse responses
Device.
Above-mentioned circuit, wherein, the forward equalizer FFE and backward balanced device FBE are transversal filter or transposition
Form wave filter.
Above-mentioned circuit, wherein, the baseband sampling signal rx (n) that bluetooth receiver receives will be with outer by low-pass filter
Disturb by frequency discriminator computing after being suppressed with noise, its output is s (n), when the symbol synchronizer circuit of receiver completes code
After first synchronization, s (n) drops to character rate from initial sampling rate, obtains x (n) and is sent into equalizer.
Above-mentioned circuit, wherein, when equalizer works, there is a Symbol Synchronization Circuit in each symbol period
Output valve x (n) enters forward equalizer FFE；FFE_out (n) is outputs of the forward equalizer FFE in nth symbol interval
Value, FBE_out (n) are output valves of the backward balanced device FBE in nth symbol interval, and EQ_out (n) is decision device n-th
Input value in a mark space；Computing of each value in each symbol period above is calculated by the following formula, wherein,
Ffe_coeff (n) and fbe_coeff (n) represents the tap coefficient of forward equalizer FFE and backward balanced device FBE respectively；
FFE_out (n)=x (n) * ffe_coeff (n)；
FBE_out (n)=sign [EQ_out (n)] * fbe_coef (n)；
EQ_out (n)=FFE_out (n)+FBE_out (n)；
Sign () is takes symbolic operation, and EQ_out (n) is the input of decision device, and sign [EQ_out (n)] is decision device
Output, the output sign [EQ_ 〇 ut (n)] of decision device are to receive the code stream recovered, give next stage resume module.
The present invention has the following advantages：1st, the present invention provides a kind of simple, low cost symbol for bluetooth receiver
Synchronization and equalizer, by the way that before balanced device, data first pass through the completion based on Gardner algorithm Symbol Synchronization Circuits
Sign synchronization, can so overcome influence of the judgement balanced device to incoming symbol sampling phase sensitivity, make decision feedback equalizer
Get a desired effect, and the bit error rate under Gaussian white noise channel can be obviously improved using the decision feedback equalizer
Performance, but increased circuit area is very small.
Brief description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent upon.Identical mark indicates identical part in whole attached drawings.Not deliberately proportionally
Draw attached drawing, it is preferred that emphasis is the purport of the present invention is shown.
Fig. 1 illustrates to be a kind of in the present invention for the sign synchronization of bluetooth receiver and the modular structure of equalizer
Figure.
Embodiment
In the following description, a large amount of concrete details are given in order to provide more thorough understanding of the invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid with the present invention obscure, for some technical characteristics well known in the art not into
Row description.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Explain technical scheme.Presently preferred embodiments of the present invention is described in detail as follows, but in addition to these detailed descriptions, this
Invention can also have other embodiment.
With reference to shown in Fig. 1, the present invention provides a kind of sign synchronization and equalizer for bluetooth receiver, bag
Include：
Symbol synchronizer circuit and equalizer based on Gardner algorithms, the symbol based on Gardner algorithms
Synchronizer circuit includes frequency discriminator, interpolation device, Timing Error Detection, loop filter and the interpolation controller being sequentially connected, institute
The output terminal for stating interpolation controller is connected with the interpolation device；The equalizer includes the forward equalizer being sequentially connected
FFE, adder, decision device and backward balanced device FBE, the output terminal of the backward balanced device FBE are connected with the adder, institute
State forward equalizer FFE and be connected with forward taps coefficient configurator, the backward balanced device FBE is connected with backward tap coefficient and matches somebody with somebody
Put device.With reference to shown in Fig. 1, Symbol Synchronization Circuit is based on Gardner algorithms in the present invention, it can overcome judgement balanced device to defeated
Enter the influence of symbol sampler phase sensitive, and Gardner algorithms are insensitive to carrier wave frequency deviation, even if the carrier auxiliary of previous stage
Carrier wave frequency deviation is not completely eliminated in module, can also work normally.
For the present invention one preferably and in non-limiting embodiment, forward equalizer FFE is the FFE balanced devices of ffe_N ranks, its
Middle ffe_N is the integer more than 1, and backward balanced device FBE is the FBE balanced devices of fbe_N ranks, and wherein fbe_N is whole more than 1
Number.
Preferably and in non-limiting embodiment, forward equalizer FFE and backward balanced device FBE have the present invention one for FIR
Limit impact response filter.
For the present invention one preferably and in non-limiting embodiment, forward equalizer FFE and backward balanced device FBE are laterally filter
Ripple device or transposed form filter.
Preferably and in non-limiting embodiment, the course of work is the present invention one：The baseband sampling that bluetooth receiver receives
For signal rx (n) by frequency discriminator computing after low-pass filter is suppressed out-of-band interference and noise, its output is s (n), when
After the symbol synchronizer circuit of receiver completes symbol synchronization, s (n) drops to character rate from initial sampling rate, obtains x (n)
And equalizer is sent into, when equalizer works, there is a Symbol Synchronization Circuit output valve x in each symbol period
(n) forward equalizer FFE is entered；FFE_out (n) is output valves of the forward equalizer FFE in nth symbol interval, FBE_
Out (n) is output valves of the backward balanced device FBE in nth symbol interval, and EQ_out (n) is decision device between nth symbol
Every interior input value；Computing of each value in each symbol period above is calculated by the following formula, wherein, ffe_
Coeff (n) and fbe_coeff (n) represents the tap coefficient of forward equalizer FFE and backward balanced device FBE respectively；
FFE_out (n)=x (n) * ffe_coeff (n)；
FBE_out (n)=sign [EQ_out (n)] * fbe_coef (n)；
EQ_out (n)=FFE_out (n)+FBE_out (n)；
Sign () is takes symbolic operation, and EQ_out (n) is the input of decision device, and sign [EQ_out (n)] is decision device
Output, the output sign [EQ_ 〇 ut (n)] of decision device are to receive the code stream recovered, give next stage resume module.
The present invention one rushes preferably and in non-limiting embodiment according to Gauss formed filter in GFSK modulated process
Hit response g (n)={ 0.0315,1,0.0315 }, it is known that it is there are intersymbol interference, and it is a non-minimum phase system.
In the Structure of Decision-feedback Equalization that the present invention uses, forward equalizer plays the role of all-pass filter, it can be g (n)
Switch to for minimum phase system；Backward balanced device plays the role of eliminating the intersymbol interference of hangover.Finally utilize all-pass filter
With the classical theory of balanced device, the forward taps of decision feedback filter device and the coefficient of backward tap can be calculated.They
Result of calculation initializes ffe_coeff (n) and fbe_coeff (n) in circuit power on configuration.The present invention preferably solves
The problem of requiring to complete sign synchronization before into balanced device, while reduce the implementation complexity of equalizer.
In the present invention, because balanced device is operated on character rate, when input data be not reaching to symbol phases synchronization,
It can influence the performance of balanced device.So before balanced device, data are first passed through based on the complete of Gardner algorithm Symbol Synchronization Circuits
Into sign synchronization, it can so overcome influence of the judgement balanced device to incoming symbol sampling phase sensitivity, make decision feedback equalization
Device gets a desired effect.In addition consider that the current application scenarios of bluetooth are substantially not present multipath effect, so in the present invention
Decision feedback equalizer do not operate at adaptive model.The coefficient of balanced device is default and fixed, it is mainly used to
The intersymbol interference that Bluetooth modulation end Gauss shaping filter introduces.The coefficient of balanced device is all quantized into 2 power in fixed-point implementation,
So multiplier is not required in hardware realization in the balanced device, with simple adder it is achieved that reducing balanced device
Implementation complexity.Program application has reached good effect, institute to the equalizer of this multiplier-less in practical applications
Digital circuit less than 2000 or so, the mould are only needed on the basis of existing chip, to increase the decision feedback equalizer
Block only accounts for 2% or so of whole bluetooth modem circuit area.It can be obviously improved using the decision feedback equalizer
Bit error rate performance under Gaussian white noise channel.When target error rate is 0.001, the SNR demodulation thresholds of classical Bluetooth signal
1dB or so can be reduced.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this area
Apply；Any those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this has no effect on the substantive content of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit of the present invention still falls within the present invention to any simple modifications, equivalents, and modifications made for any of the above embodiments
In the range of technical solution protection.
Claims (7)
- A kind of 1. sign synchronization and equalizer for bluetooth receiver, it is characterised in that including：Symbol synchronizer circuit and equalizer based on Gardner algorithms, the sign synchronization based on Gardner algorithms Device circuit includes frequency discriminator, interpolation device, Timing Error Detection, loop filter and the interpolation controller being sequentially connected, described interior The output terminal for plugging in controller is connected with the interpolation device；The equalizer include be sequentially connected forward equalizer FFE, plus Musical instruments used in a Buddhist or Taoist mass, decision device and backward balanced device FBE, the output terminal of the backward balanced device FBE are connected with the adder, the forward direction Balanced device FFE is connected with forward taps coefficient configurator, and the backward balanced device FBE is connected with backward tap coefficient configurator.
- A kind of 2. sign synchronization and equalizer for bluetooth receiver as claimed in claim 1, it is characterised in that institute The FFE balanced devices that forward equalizer FFE is ffe_N ranks are stated, wherein ffe_N is the integer more than 1.
- A kind of 3. sign synchronization and equalizer for bluetooth receiver as claimed in claim 2, it is characterised in that institute The FBE balanced devices that backward balanced device FBE is fbe_N ranks are stated, wherein fbe_N is the integer more than 1.
- A kind of 4. sign synchronization and equalizer for bluetooth receiver as claimed in claim 1, it is characterised in that institute It is FIR finite impulse response filters to state forward equalizer FFE and backward balanced device FBE.
- A kind of 5. sign synchronization and equalizer for bluetooth receiver as claimed in claim 1, it is characterised in that institute It is transversal filter or transposed form filter to state forward equalizer FFE and backward balanced device FBE.
- 6. such as a kind of sign synchronization and equalizer for bluetooth receiver of claim 1-5 any one of them, it is special Sign is that the baseband sampling signal rx (n) that bluetooth receiver receives is pressed down out-of-band interference and noise by low-pass filter By frequency discriminator computing after system, its output is s (n), and after the symbol synchronizer circuit of receiver completes symbol synchronization, s (n) is from first Beginning sampling rate drops to character rate, obtains x (n) and is sent into equalizer.
- A kind of 7. sign synchronization and equalizer for bluetooth receiver as claimed in claim 6, it is characterised in that when When equalizer works, there is a Symbol Synchronization Circuit output valve x (n) to enter forward equalizer in each symbol period FFE；FFE_out (n) is output valves of the forward equalizer FFE in nth symbol interval, and FBE_out (n) is backward balanced device Output valves of the FBE in nth symbol interval, EQ_out (n) are input value of the decision device in nth symbol interval；More than Computing of each value in each symbol period is calculated by the following formula, wherein, ffe_coeff (n) and fbe_coeff (n) tap coefficient of forward equalizer FFE and backward balanced device FBE is represented respectively；FFE_out (n)=x (n) * ffe_coeff (n)；FBE_out (n)=sign [EQ_out (n)] * fbe_coef (n)；EQ_out (n)=FFE_out (n)+FBE_out (n)；Sign () is takes symbolic operation, and EQ_out (n) is the input of decision device, and sign [EQ_out (n)] is the output of decision device, The output sign [EQ_ 〇 ut (n)] of decision device is to receive the code stream recovered, gives next stage resume module.
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| CN201711264902.6A CN108040026A (en) | 2017-12-05 | 2017-12-05 | A kind of sign synchronization and equalizer for bluetooth receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111107025A (en) * | 2018-10-26 | 2020-05-05 | 上海晟矽微电子股份有限公司 | Adaptive equalizer in GFSK receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401821A (en) * | 2013-07-22 | 2013-11-20 | 苏州英菲泰尔电子科技有限公司 | Adaptive equalizer of Bluetooth 4.0 low-power receiver and implementation method of adaptive equalizer |
| US20140082040A1 (en) * | 2009-02-05 | 2014-03-20 | Qualcomm Incorporated | Passive switched-capacitor filters conforming to power constraint |
| CN106603217A (en) * | 2017-01-18 | 2017-04-26 | 深圳市极致汇仪科技有限公司 | Sampling frequency offset suppression method for Bluetooth signal of wireless integrated measuring instrument |
-
2017
- 2017-12-05 CN CN201711264902.6A patent/CN108040026A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140082040A1 (en) * | 2009-02-05 | 2014-03-20 | Qualcomm Incorporated | Passive switched-capacitor filters conforming to power constraint |
| CN103401821A (en) * | 2013-07-22 | 2013-11-20 | 苏州英菲泰尔电子科技有限公司 | Adaptive equalizer of Bluetooth 4.0 low-power receiver and implementation method of adaptive equalizer |
| CN106603217A (en) * | 2017-01-18 | 2017-04-26 | 深圳市极致汇仪科技有限公司 | Sampling frequency offset suppression method for Bluetooth signal of wireless integrated measuring instrument |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111107025A (en) * | 2018-10-26 | 2020-05-05 | 上海晟矽微电子股份有限公司 | Adaptive equalizer in GFSK receiver |
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Effective date of registration: 20190903 Address after: 266101 Room 402, Block B, Qingdao International Innovation Park, No. 1, Keyuan Wei Road, Laoshan District, Qingdao City, Shandong Province Applicant after: Qingdao Furuikun Microelectronics Technology Co., Ltd. Address before: Room 401 and 402, Lane No. 3, 289, Bisheng Road, Pudong New Area Free Trade Pilot Area, Shanghai, 2013 Applicant before: Shanghai rich Micro Electronics Co., Ltd. |
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Application publication date: 20180515 |