CN108736996A - Frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation - Google Patents
Frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation Download PDFInfo
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- CN108736996A CN108736996A CN201710259752.3A CN201710259752A CN108736996A CN 108736996 A CN108736996 A CN 108736996A CN 201710259752 A CN201710259752 A CN 201710259752A CN 108736996 A CN108736996 A CN 108736996A
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- rssi
- cfo
- relative signal
- frequency
- opposite carrier
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
- H04H20/48—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for FM stereophonic broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
- H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
Abstract
The present invention provides a kind of frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation.The method includes：Four adjacent frequencies are searched for, are denoted as f_0, f_1, f_2 and f_3 respectively；The signal strength values for calculating separately four adjacent frequencies, are respectively labeled as RSSI_0, RSSI_1, RSSI_2, RSSI_3；Calculate separately carrier frequency bias CFO_0, CFO_1, CFO_2, CFO_3 of four adjacent frequencies；Calculate the relative signal-strength values of four adjacent frequencies and opposite carrier frequency bias；According to relative signal-strength values and opposite carrier frequency bias judgement f-m broadcast station frequency point position.The present invention can avoid the problem that causing optimal threshold to change because of reception antenna configuration variation, and leakage platform, faulting of slab ends problem.
Description
Technical field
The present invention relates to frequency modulation broadcasting technical fields, more particularly to one kind is based on relative signal intensity and opposite carrier wave frequency deviation
Frequency modulation broadcasting channel search method.
Background technology
The purpose of frequency modulation broadcasting tuning is that user is allow to be quickly found out broadcasting station present in frequency range；Channel search method is set
The matter of utmost importance that counting need to solve is to avoid leakage platform and faulting of slab ends phenomenon, followed by realize that a set of fixed threshold is applicable to inhomogeneity
The antenna configuration of type, different length.
Several different bases have been disclosed in patent CN103795484B, CN102055489B and CN101465667B
It is to be based on absolutely in a common trait of the frequency modulation broadcasting channel search method of signal strength, signal-to-noise ratio or frequency deviation, but such method
Parameter value is judged, after the low-pass filtered device of signal, filtered signal intensity, signal-to-noise ratio or frequency deviation and given threshold are compared
Relatively come tentatively to judge to search for whether frequency point is effective radio station, if otherwise search frequency point, which is effective radio station, continues search for next frequency
Point, wherein by the preset parameter of register configuration when the given threshold is frequency modulation broadcasting product export, setting when manufacture
It is optimal threshold to determine threshold value.
However, when same FM broadcast receiver is in telescopic antenna difference unfolded length or using different earplugs as day
When line, therefore the optimal threshold of FM broadcast receiver tuning can change, and given threshold is a preset parameter to change,
At this point, given threshold is not identical as optimal threshold；Therefore, it is being connect using the method that given threshold carries out tuning as absolute reference
More serious leakage platform or faulting of slab ends problem may be led to by receiving when antenna configuration changes.
Invention content
Channel search method provided by the invention based on relative signal intensity with the frequency modulation broadcasting of opposite carrier wave frequency deviation, can keep away
The problem of exempting to cause optimal threshold to change because of reception antenna configuration variation, and leakage platform, faulting of slab ends problem.
In a first aspect, the present invention provides a kind of frequency modulation broadcasting tuning side based on relative signal intensity with opposite carrier wave frequency deviation
Method, including：
Four adjacent frequencies are searched for, are denoted as f_0, f_1, f_2 and f_3 respectively；
The signal strength values for calculating separately four adjacent frequencies, be respectively labeled as RSSI_0, RSSI_1, RSSI_2,
RSSI_3；
Calculate separately carrier frequency bias CFO_0, CFO_1, CFO_2, CFO_3 of four adjacent frequencies；
Calculate the relative signal-strength values of four adjacent frequencies and opposite carrier frequency bias；
According to relative signal-strength values and opposite carrier frequency bias judgement f-m broadcast station frequency point position.
Optionally, the calculating of the relative signal-strength values for calculating four adjacent frequencies and opposite carrier frequency bias
As a result it is：
Δ RSSI_20=RSSI_2-RSSI_0
Δ RSSI_10=RSSI_1-RSSI_0
Δ RSSI_23=RSSI_2-RSSI_3
Δ RSSI_13=RSSI_1-RSSI_3
Δ CFO_10=CFO_1-CFO_0
Δ CFO_21=CFO_2-CFO_1
Δ CFO_32=CFO_3-CFO_2
Wherein, Δ RSSI indicates that relative signal-strength values, Δ CFO indicate opposite carrier frequency bias.
Optionally, described according to relative signal-strength values and opposite carrier frequency bias judgement f-m broadcast station frequency point position
Including：
When Δ RSSI_20, Δ RSSI_10 are all higher than Δ RSSI_TH and Δ CFO_32, Δ CFO_21 are all higher than Δ CFO_TH
When, there are f-m broadcast stations to be located at f_2 frequency points for judgement；
When Δ RSSI_23, Δ RSSI_13 are all higher than Δ RSSI_TH and Δ CFO_10, Δ CFO_21 are all higher than Δ CFO_TH
When, there are f-m broadcast stations to be located at f_1 frequency points for judgement.
Frequency modulation broadcasting channel search method provided in an embodiment of the present invention based on relative signal intensity with opposite carrier wave frequency deviation, leads to
It crosses and judgement is compared using relative signal intensity parameter, avoid because reception antenna configuration variation causes optimal threshold to change
Problem；Meanwhile not influenced by antenna configuration variation using opposite carrier wave frequency deviation parameter, and can still estimate in Low SNR
Accurate feature is counted, relative signal intensity is combined frequency-modulation broadcasting radio station with opposite carrier wave frequency deviation parameter to be judged, can
Effectively reduce leakage platform and faulting of slab ends phenomenon.
Description of the drawings
Fig. 1 is frequency modulation broadcasting channel search method of the one embodiment of the invention based on relative signal intensity with opposite carrier wave frequency deviation
Flow chart；
Fig. 2 is the calculating of relative signal-strength values and opposite carrier frequency bias that the present invention calculates four adjacent frequencies
Schematic diagram；
Fig. 3 is the state transition diagram during one embodiment of the invention frequency modulation broadcasting search radio station tuning.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation, such as Fig. 1
It is shown, the method includes：
Four S11, search adjacent frequencies, are denoted as f_0, f_1, f_2 and f_3 respectively；
S12, the signal strength values for calculating separately four adjacent frequencies, be respectively labeled as RSSI_0, RSSI_1,
RSSI_2,RSSI_3；
S13, carrier frequency bias CFO_0, CFO_1, CFO_2, the CFO_3 for calculating separately four adjacent frequencies；
S14, the relative signal-strength values for calculating four adjacent frequencies and opposite carrier frequency bias；
S15, judge f-m broadcast station frequency point position according to relative signal-strength values and opposite carrier frequency bias.
Frequency modulation broadcasting channel search method provided in an embodiment of the present invention based on relative signal intensity with opposite carrier wave frequency deviation, leads to
It crosses and judgement is compared using relative signal intensity parameter, avoid because reception antenna configuration variation causes optimal threshold to change
Problem；Meanwhile not influenced by antenna configuration variation using opposite carrier wave frequency deviation parameter, and can still estimate in Low SNR
Accurate feature is counted, relative signal intensity is combined frequency-modulation broadcasting radio station with opposite carrier wave frequency deviation parameter to be judged, can
Effectively reduce leakage platform and faulting of slab ends phenomenon.
Optionally, as shown in Fig. 2, for the relative signal-strength values for calculating four adjacent frequencies and opposite carrier wave
The schematic diagram of frequency deviation value calculates the result of calculation of the relative signal-strength values and opposite carrier frequency bias of four adjacent frequencies
For：
Δ RSSI_20=RSSI_2-RSSI_0
Δ RSSI_10=RSSI_1-RSSI_0
Δ RSSI_23=RSSI_2-RSSI_3
Δ RSSI_13=RSSI_1-RSSI_3
Δ CFO_10=CFO_1-CFO_0
Δ CFO_21=CFO_2-CFO_1
Δ CFO_32=CFO_3-CFO_2
Wherein, Δ RSSI indicates that relative signal-strength values, Δ CFO indicate opposite carrier frequency bias.
Optionally, described according to relative signal-strength values and opposite carrier frequency bias judgement f-m broadcast station frequency point position
Including：
When Δ RSSI_20, Δ RSSI_10 are all higher than Δ RSSI_TH and Δ CFO_32, Δ CFO_21 are all higher than Δ CFO_TH
When, there are f-m broadcast stations to be located at f_2 frequency points for judgement；
When Δ RSSI_23, Δ RSSI_13 are all higher than Δ RSSI_TH and Δ CFO_10, Δ CFO_21 are all higher than Δ CFO_TH
When, there are f-m broadcast stations to be located at f_1 frequency points for judgement；
Optionally, Δ RSSI_TH may be configured as 9dB, and Δ CFO_TH may be configured as 1/2 frequency point interval.
Optionally, the process in frequency modulation broadcasting search radio station is as follows：When user switches next radio station then, then from currently playing frequency
Point starts allowing to search for next radio station by frequency point in band limits；When user switches a upper radio station then, then from currently playing frequency
Point starts allowing to search for a upper radio station by frequency point in band limits；The frequency modulation broadcasting radio reception if searching out f-m broadcast station frequency point
Machine returns to play mode and plays the radio station that new search arrives, and FM broadcast receiver returns if not searching out radio station in entire frequency range
It is played to the frequency point played before.
Optionally, as shown in figure 3, for frequency modulation broadcasting search for radio station tuning during state transition diagram, be divided into S0~
Tetra- kinds of states of S3：
S0 states are to normally receive state.The f-m broadcast station of normal play Fc frequency points under the state；Setting one
Flag is for marking the frequency point number swept, Flag=0 under S0 states；One Fc_last_station register of setting is for protecting
A broadcast station frequency point Fc is deposited, the purpose for recording a upper broadcast station is to sweep after platform one encloses to receive if not searching out effective radio station
Continue back at origin-location.When user key-press handoff radio, state machine is converted to S1 states.One Round_flag of setting is used
Round_flag is 0 when whether label sweeps platform in the circle of entire frequency range search one, S0 states.
S1 is configuration RF buffer status.When handoff radio, Fc is updated to Fc+Step, when switching a upper radio station, Step
Acquiescence takes 100KHz, and Step acquiescences take -100KHz when switching next radio station.Default ranging from 87500~108000KHz,
There is Fc<When 87500, Fc=108000；There is Fc>When 108000, Fc=87500.It is suitable that frequency point generates after the completion of calculating
Code word is controlled, control frequency modulation broadcasting chip RF registers make reception frequency point be adjusted to Fc.Fc is equal to Fc_last_ for the first time
Round_flag sets 1 when station+Step*2, as Round_flag==1 and Fc==Fc_last_station+Step*2
When indicate that entire frequency search is completed, state jumps to S0 by S1, and frequency modulation broadcasting continues to Fc_last_station frequency points pair
The radio station (indicating that one circle of search does not search out effective radio station) answered, otherwise, S1 states jump to S2 states after the completion of executing.
S2 is wait state.Due to RF modules, automatic growth control and signal strength and carrier wave in frequency modulation broadcasting chip
The estimation of frequency deviation is required for the regular hour, thus S1 states configure RF registers after need to wait for signal strength and carrier wave frequency deviation
Numerical convergence is to stationary value.The stand-by period is calculated by timer, is jumped to after waiting for 64ms under default situations
S3 states.
S3 is judgement state.Read the corresponding received signal strength value of current frequency point and carrier frequency bias.With f_0, f_1,
F_2 and f_3 indicates the adjacent frequency of four frequencies from low to high, the signal strength read and carrier wave frequency deviation value parameter,
It is denoted as RSSI_0, RSSI_1, RSSI_2, RSSI_3 and CFO_0, CFO_1, CFO_2, CFO_3 respectively；Calculate different frequent points it
Between relative signal intensity (Δ RSSI) and opposite carrier wave frequency deviation (Δ CFO), wherein：
Δ RSSI_20=RSSI_2-RSSI_0
Δ RSSI_10=RSSI_1-RSSI_0
Δ RSSI_23=RSSI_2-RSSI_3
Δ RSSI_13=RSSI_1-RSSI_3
Δ CFO_10=CFO_1-CFO_0
Δ CFO_21=CFO_2-CFO_1
Δ CFO_32=CFO_3-CFO_2
By comparing relative signal intensity, opposite carrier wave frequency deviation and relative signal intensity threshold value (Δ RSSI_TH), opposite load
The size of the inclined threshold value (Δ CFO_TH) of wave frequency judges f-m broadcast station frequency point position, if Δ RSSI_20, Δ RSSI_10 are equal
It is all higher than Δ CFO_TH more than Δ RSSI_TH and Δ CFO_32, Δ CFO_21 and then judges that there are f-m broadcast stations to be located at f_2 frequencies
Point is sentenced if Δ RSSI_23, Δ RSSI_13 are all higher than Δ RSSI_TH and Δ CFO_10, Δ CFO_21 are all higher than Δ CFO_TH
Surely there is f-m broadcast station and be located at f_1 frequency points.
The present embodiment Δ RSSI_TH is set as 9dB, and Δ CFO_TH is set as 50KHz, i.e. Step/2.If judgement exists wide
It broadcasts radio station and is located at f_2 frequency points or f_1 frequency points, then state jumps to S0 by S3 and plays the radio station newly searched out, the shape if without radio station
State jumps to S1 by S3 and continues to search for by frequency point.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (3)
1. a kind of frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation, which is characterized in that including：
Four adjacent frequencies are searched for, are denoted as f_0, f_1, f_2 and f_3 respectively；
The signal strength values for calculating separately four adjacent frequencies, are respectively labeled as RSSI_0, RSSI_1, RSSI_2, RSSI_
3；
Calculate separately carrier frequency bias CFO_0, CFO_1, CFO_2, CFO_3 of four adjacent frequencies；
Calculate the relative signal-strength values of four adjacent frequencies and opposite carrier frequency bias；
According to relative signal-strength values and opposite carrier frequency bias judgement f-m broadcast station frequency point position.
2. according to the method described in claim 1, it is characterized in that, the relative signal for calculating four adjacent frequencies is strong
The result of calculation of angle value and opposite carrier frequency bias is：
Δ RSSI_20=RSSI_2-RSSI_0
Δ RSSI_10=RSSI_1-RSSI_0
Δ RSSI_23=RSSI_2-RSSI_3
Δ RSSI_13=RSSI_1-RSSI_3
Δ CFO_10=CFO_1-CFO_0
Δ CFO_21=CFO_2-CFO_1
Δ CFO_32=CFO_3-CFO_2
Wherein, Δ RSSI indicates that relative signal-strength values, Δ CFO indicate opposite carrier frequency bias.
3. according to the method described in claim 1, it is characterized in that, described according to relative signal-strength values and opposite carrier wave frequency deviation
Value judgement f-m broadcast station frequency point position includes：
When Δ RSSI_20, Δ RSSI_10 are all higher than Δ RSSI_TH and Δ CFO_32, Δ CFO_21 are all higher than Δ CFO_TH,
There are f-m broadcast stations to be located at f_2 frequency points for judgement；
When Δ RSSI_23, Δ RSSI_13 are all higher than Δ RSSI_TH and Δ CFO_10, Δ CFO_21 are all higher than Δ CFO_TH,
There are f-m broadcast stations to be located at f_1 frequency points for judgement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710259752.3A CN108736996A (en) | 2017-04-19 | 2017-04-19 | Frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation |
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|---|---|---|---|
| CN201710259752.3A CN108736996A (en) | 2017-04-19 | 2017-04-19 | Frequency modulation broadcasting channel search method based on relative signal intensity with opposite carrier wave frequency deviation |
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| CN105812080A (en) * | 2014-12-31 | 2016-07-27 | 展讯通信（上海）有限公司 | Radio signal automatic searching device and method and frequency modulation radio |
| CN105827339A (en) * | 2014-06-26 | 2016-08-03 | 青岛海信移动通信技术股份有限公司 | Method and device for searching radio station |
| US20160277177A1 (en) * | 2013-07-24 | 2016-09-22 | Silicon Laboratories Inc. | Apparatus for Receiver With Digital Signal Arrival Detector and Associated Methods |
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2017
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465667A (en) * | 2007-12-18 | 2009-06-24 | 上海晨兴电子科技有限公司 | Method for obtaining corresponding optimum channel of mobile phone FM receiving station |
| CN101953078A (en) * | 2008-02-04 | 2011-01-19 | 天工方案公司 | Be used for system and method in detection of radio receiver radio station and search |
| CN102055489A (en) * | 2009-10-28 | 2011-05-11 | 博通集成电路（上海）有限公司 | Channel searching device and method for broadcasting receiver |
| EP2326130A1 (en) * | 2009-11-19 | 2011-05-25 | Research In Motion Limited | Method, device and system for detecting the mobility of a mobile device |
| US20160277177A1 (en) * | 2013-07-24 | 2016-09-22 | Silicon Laboratories Inc. | Apparatus for Receiver With Digital Signal Arrival Detector and Associated Methods |
| CN103795484A (en) * | 2014-02-27 | 2014-05-14 | 江苏卓胜微电子有限公司 | Frequency-offset-following channel search method |
| CN105827339A (en) * | 2014-06-26 | 2016-08-03 | 青岛海信移动通信技术股份有限公司 | Method and device for searching radio station |
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