CN109586837A - The device and method of cell searching in a kind of IOT-G system - Google Patents
The device and method of cell searching in a kind of IOT-G system Download PDFInfo
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- CN109586837A CN109586837A CN201811491484.9A CN201811491484A CN109586837A CN 109586837 A CN109586837 A CN 109586837A CN 201811491484 A CN201811491484 A CN 201811491484A CN 109586837 A CN109586837 A CN 109586837A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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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
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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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
- H04L27/2657—Carrier synchronisation
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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
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
- H04L2027/003—Correction of carrier offset at baseband only
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of device and methods of cell searching in IOT-G system, and in particular to electric system mobile communication field.The device includes sequentially connected SNR detection module, offset estimation and compensating module and PBCH decoding module；SNR detection module is configurable for processing primary synchronization signal PSS and secondary synchronization signal SSS；Offset estimation and compensating module are configurable for processing fractional part of frequency offset, the calculating of integer frequency offset and residual frequency deviation and frequency deviation compensation；PBCH decoding module is configurable for the mib information that processing PBCH channel carries, the invention passes through IOT-G air interface signals in the wireless context and analyzes base station broadcast mib information in real time, realizes terminal (UE) to the Timing Synchronization and Frequency Synchronization of IOT-G system base-station (eNodeB).
Description
Technical field
The present invention relates to electric system mobile communication fields, and in particular to the device of cell searching in a kind of IOT-G system
And method.
Background technique
IOT-G system is by the existing 230M frequency range discrete spectrum of power grid and advanced forth generation (4G) mobile communication technology
(TD-LTE) it combines, is greatly improved using depth custom strategies by using technologies such as discrete spectrum polymerization, frequency spectrum perceptions
The service efficiency of radio frequency resources (230MHz frequency range), realizes broadband data transmission in narrow band spectrum, is electric system
Industry provides wireless broadband communication access.
IOT-G system 223.025~235.000MHz of working frequency range, using TDD duplex mode, uplink/downlink uses respectively
SC-FDMA/OFDM multi-access mode, supports QPSK, 16QAM and 64QAM Different Modulations, and single cell throughout can achieve peak
It is worth rate 14.96Mbps, terminal peak rate 1.76Mbps.
For electric system mobile cellular communication system, cell searching and down-going synchronous process are one particularly significant
The step of.After user terminal (UE) is switched in IOT-G cell based on by OFDMA technology to be powered on, need as quasi- as possible
Timing Synchronization and Frequency Synchronization are really quickly obtained, cell information is obtainedWith IOT-G system base-station
(eNodeB) connection is obtained, so that subsequent data service communications process is normal.
Summary of the invention
The purpose of the present invention is to propose to a kind of device and method of cell searching in IOT-G system, this device and methods
Have very strong robustness, is allowed to work normally in cell overlapping region as far as possible, can complete in the shortest possible time
Search process realizes quick down-going synchronous.
The present invention specifically adopts the following technical scheme that
The device of cell searching in a kind of IOT-G system, including sequentially connected SNR detection module, offset estimation and benefit
Repay module and PBCH decoding module；
The SNR detection module is configurable for processing synchronization signal primary synchronization signal PSS and secondary synchronization signal SSS；
The offset estimation and compensating module are configurable for processing fractional part of frequency offset, integer frequency offset and residual frequency deviation
Calculating and frequency deviation compensation；
The PBCH decoding module is configurable for the mib information that processing PBCH channel carries.
Preferably, the SNR detection module includes sequentially connected primary synchronization signal PSS detection module, offset estimation benefit
Repay module and secondary synchronization signal SSS detection module；
The primary synchronization signal PSS detection module is configurable for handling determining 20ms frame head；
The frequency offset estimation compensation module is configurable for processing baseband signal and carries out Frequency offset estimation and compensation；
The secondary synchronization signal SSS detection module is configurable for processing and determines
Preferably, the primary synchronization signal PSS detection module includes sequentially connected local primary synchronization signal PSS sequence mould
Block, primary synchronization signal PSS tim e- domain detection module and primary synchronization signal PSS essence synchronization module.
Preferably, the offset estimation includes that the carrier wave connecting in closed loop adjusts module, fractional part of frequency offset with compensating module
Estimation module, integer frequency offset estimation module and residual frequency deviation estimation module composition, the output end of residual frequency deviation estimation module with
The input terminal that carrier wave adjusts module is connected.
Preferably, the PBCH decoding module includes sequentially connected going CP/FFT module, channel estimation frequency domain equalization mould
Block, solution prelist code layer mapping block, demodulation solution scrambling module, de-rate matcher block, Viterbi decoding module, CEC verification
Module, MIB bit flow module and determining cell ID module composition；The output end of the PBCH decoding module and go CP/FFT module
Input terminal be connected.
Small region search method in a kind of IOT-G system, using the device of cell searching in IOT-G system as described above,
It specifically includes:
Step 1: SNR detection module receives base band data, passes through the primary synchronization signal of primary synchronization signal PSS detection module
PSS detection, the offset estimation and compensation of offset estimation and compensating module, the secondary synchronization signal of secondary synchronization signal SSS detection module
SSS detects to determine 20ms Timing Synchronization；
Step 1.1: ifPrimary synchronization signal PSS time domain data is formed according to PSS1 and PSS2, is directly transmitted
To local primary synchronization signal PSS detection module；
Step 1.2: ifPrimary synchronization signal PSS time domain data is formed according to PSS2 and PSS1, is directly transmitted
To local primary synchronization signal PSS detection module；
Step 1.3: local primary synchronization signal PSS detection module directly and baseband signal according to time domain slide coherent detection,
Maximizing determines frame head；
Step 1.4: exchanging integral basis band signal and carry out offset estimation, carry out carrier wave adjustment；
Step 1.5: the 20ms frame head essence for carrying out primary synchronization signal PSS to baseband signal after carrier wave adjustment is synchronous, carries out same
Successive step；
Step 1.6: according toTraversal generates all secondary synchronization signal SSS time domain datas, is directly passed to
Local secondary synchronization signal SSS detection module；
Step 1.7: baseband signal after synchronous adjustment detects secondary synchronization signal SSS according to time domain correlation to determine
Step 2: frequency offset estimation compensation module being sent into baseband signal after synchronous adjustment, determines carrier wave frequency deviation, carries out carrier wave
Adjustment；
Step 2.1: to baseband signal after synchronous adjustment, cyclic prefix CP is utilized in the time domain, determines fractional part of frequency offset, into
The adjustment of row carrier wave；
Step 2.2: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines integral multiple
Frequency deviation carries out carrier wave adjustment；
Step 2.3: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines remaining frequency
Partially, carrier wave adjustment is carried out；
Step 3: is extracted by PBCH channel signal and is sent into PBCH according to PBCH carrier frequency for baseband signal after Timing Synchronization
Decoding module obtains system broadcasts MIB bit stream information；
Step 3.1: to the PBCH time-domain signal of extraction, passing to CP/FFT module, be removed CP, FFT transform, carry
Wave moves processing, obtains frequency domain data；
Step 3.2: to frequency domain data, passing to channel estimation frequency domain equalization module, carry out local reference signal generation, letter
Road estimation and frequency domain equalization processing, go back original sender data；
Step 3.3: to data after equilibrium, passing to solution and prelist code layer mapping block, according to single antenna port and double antenna
Port carries out solution precoding reconciliation layer mapping processing；
Step 3.4: to solution layer mapped data, passing to demodulation solution scrambling module, according to BPSK modulation, utilize parameterScramble sequence is generated, demodulation reconciliation scrambling processing is carried out；
Step 3.5: to data after solution scrambling, passing to de-rate matcher block, carry out solution rate-matched processing；
Step 3.6: to de-rate matched data, passing to Viterbi decoding module, carry out the processing of tail biting folding coding；
Step 3.7: to data after tail biting folding coding, passing to CRC check module, carry out CRC check processing；
Step 3.8: to data after CRC check, transmitting MIB bit flow module, according to system message composed structure, carry out
MIB bit extraction process；
Step 3.9: data after extracting to MIB bit are transmitted and determine cell ID module, according to parameterBelieve with system
Breath carries out cell ID and determines processing.
The invention has the following beneficial effects:
Base station broadcast mib information is analyzed in real time by IOT-G air interface signals in the wireless context, realizes terminal
(UE) to the Timing Synchronization and Frequency Synchronization of IOT-G system base-station (eNodeB)；
The device and method has very strong robustness, is allowed to work normally in cell overlapping region as far as possible, Neng Gou
Search process is completed in time as short as possible, realizes quick down-going synchronous.
Detailed description of the invention
Fig. 1 is IOT-G system frame structure schematic diagram；
Fig. 2 is cell searching structure schematic diagram；
Fig. 3 is Timing Synchronization detection structure schematic diagram；
Fig. 4 is offset estimation and collocation structure schematic diagram；
Fig. 5 is PBCH decoding module structural schematic diagram.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
As shown in Figure 1, being IOT-G system TDD frame structure schematic diagram, downlink and uplink transmission is Tf=in the duration
In the frame of 600 × Ts=10ms, a frame include 5 length be 120 be Ts time slot, number from 0 to 4, under time slot 0 and 1 is
Row time slot, time slot 3 and 4 are ascending time slots, and time slot 2 is special time slot, by DwPTS, GP and UpPTS form, DwPTS, GP and
The length of UpPTS is respectively 20 × Ts, 40 × Ts and 60 × Ts.
As shown in Fig. 2, in a kind of IOT-G system cell searching device, including sequentially connected SNR detection module, frequency
Estimation and compensating module and PBCH decoding module partially；
The SNR detection module is configurable for processing primary synchronization signal PSS and secondary synchronization signal SSS；
The offset estimation and compensating module are configurable for processing fractional part of frequency offset, integer frequency offset and residual frequency deviation
Calculating and frequency deviation compensation；
The PBCH decoding module is configurable for the mib information that processing PBCH channel carries.
As shown in figure 3, the SNR detection module includes that sequentially connected primary synchronization signal PSS detection module, frequency deviation are estimated
Count compensating module and secondary synchronization signal SSS detection module；
Primary synchronization signal PSS detection module is configurable for handling determining 20ms frame head；
Frequency offset estimation compensation module is configurable for processing baseband signal and carries out Frequency offset estimation and compensation；
Secondary synchronization signal SSS detection module is configurable for processing and determines
Primary synchronization signal PSS detection module includes sequentially connected local primary synchronization signal PSS block, main synchronous letter
Number PSS tim e- domain detection module and primary synchronization signal PSS essence synchronization module.
As shown in figure 4, offset estimation includes that the carrier wave connecting in closed loop adjusts module, fractional part of frequency offset is estimated with compensating module
Count module, integer frequency offset estimation module and residual frequency deviation estimation module composition, the output end and load of residual frequency deviation estimation module
The input terminal that wave adjusts module is connected.
As shown in figure 5, PBCH decoding module includes sequentially connected going CP/FFT module, channel estimation frequency domain equalization mould
Block, solution prelist code layer mapping block, demodulation solution scrambling module, de-rate matcher block, Viterbi decoding module, CEC verification
Module, MIB bit flow module and determining cell ID module composition；The output end of the PBCH decoding module and go CP/FFT module
Input terminal be connected.
Small region search method in a kind of IOT-G system, using the device of cell searching in IOT-G system as described above,
It specifically includes:
Step 1: SNR detection module receives base band data, passes through the primary synchronization signal of primary synchronization signal PSS detection module
PSS detection, the offset estimation and compensation of offset estimation and compensating module, the secondary synchronization signal of secondary synchronization signal SSS detection module
SSS detects to determine 20ms Timing Synchronization；
Step 1.1: ifPrimary synchronization signal PSS time domain data is formed according to PSS1 and PSS2, is directly transmitted
To local primary synchronization signal PSS detection module；
Step 1.2: ifPrimary synchronization signal PSS time domain data is formed according to PSS2 and PSS1, is directly transmitted
To local primary synchronization signal PSS detection module；
Step 1.3: local primary synchronization signal PSS detection module directly and baseband signal according to time domain slide coherent detection,
Maximizing determines frame head；
Step 1.4: exchanging integral basis band signal and carry out offset estimation, carry out carrier wave adjustment；
Step 1.5: the 20ms frame head essence for carrying out primary synchronization signal PSS to baseband signal after carrier wave adjustment is synchronous, carries out same
Successive step；
Step 1.6: according toTraversal generates all secondary synchronization signal SSS time domain datas, is directly passed to
Local secondary synchronization signal SSS detection module；
Step 1.7: baseband signal after synchronous adjustment detects secondary synchronization signal SSS according to time domain correlation to determine
Step 2: frequency offset estimation compensation module being sent into baseband signal after synchronous adjustment, determines carrier wave frequency deviation, carries out carrier wave
Adjustment；
Step 2.1: to baseband signal after synchronous adjustment, cyclic prefix CP is utilized in the time domain, determines fractional part of frequency offset, into
The adjustment of row carrier wave；
Step 2.2: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines integral multiple
Frequency deviation carries out carrier wave adjustment；
Step 2.3: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines remaining frequency
Partially, carrier wave adjustment is carried out；
Step 3: is extracted by PBCH channel signal and is sent into PBCH according to PBCH carrier frequency for baseband signal after Timing Synchronization
Decoding module obtains system broadcasts MIB bit stream information；
Step 3.1: to the PBCH time-domain signal of extraction, passing to CP/FFT module, be removed CP, FFT transform, carry
Wave moves processing, obtains frequency domain data；
Step 3.2: to frequency domain data, passing to channel estimation frequency domain equalization module, carry out local reference signal generation, letter
Road estimation and frequency domain equalization processing, go back original sender data；
Step 3.3: to data after equilibrium, passing to solution and prelist code layer mapping block, according to single antenna port and double antenna
Port carries out solution precoding reconciliation layer mapping processing；
Step 3.4: to solution layer mapped data, passing to demodulation solution scrambling module, according to BPSK modulation, utilize parameterScramble sequence is generated, demodulation reconciliation scrambling processing is carried out；
Step 3.5: to data after solution scrambling, passing to de-rate matcher block, carry out solution rate-matched processing；
Step 3.6: to de-rate matched data, passing to Viterbi decoding module, carry out the processing of tail biting folding coding；
Step 3.7: to data after tail biting folding coding, passing to CRC check module, carry out CRC check processing；
Step 3.8: to data after CRC check, transmitting MIB bit flow module, according to system message composed structure, carry out
MIB bit extraction process；
Step 3.9: data after extracting to MIB bit are transmitted and determine cell ID module, according to parameterBelieve with system
Breath carries out cell ID and determines processing.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (6)
1. the device of cell searching in a kind of IOT-G system, which is characterized in that including sequentially connected SNR detection module, frequency
Estimation and compensating module and PBCH decoding module partially；
The SNR detection module is configurable for processing primary synchronization signal PSS and secondary synchronization signal SSS；
The offset estimation and compensating module are configurable for processing fractional part of frequency offset, the meter of integer frequency offset and residual frequency deviation
It calculates and frequency deviation compensates；
The PBCH decoding module is configurable for the mib information that processing PBCH channel carries.
2. the device of cell searching in a kind of IOT-G system as described in claim 1, which is characterized in that the Timing Synchronization mould
Block includes sequentially connected primary synchronization signal PSS detection module, frequency offset estimation compensation module and secondary synchronization signal SSS detection mould
Block；
The primary synchronization signal PSS detection module is configurable for handling determining 20ms frame head；
The frequency offset estimation compensation module is configurable for processing baseband signal and carries out Frequency offset estimation and compensation；
The secondary synchronization signal SSS detection module is configurable for processing and determines
3. the device of cell searching in a kind of IOT-G system as claimed in claim 2, which is characterized in that the main synchronous letter
Number PSS detection module includes sequentially connected local primary synchronization signal PSS block, primary synchronization signal PSS tim e- domain detection mould
Block and primary synchronization signal PSS essence synchronization module.
4. the device of cell searching in a kind of IOT-G system as described in claim 1, which is characterized in that the offset estimation
It include that the carrier wave connecting in closed loop adjusts module, fractional part of frequency offset estimation module, integer frequency offset estimation module with compensating module
It is formed with residual frequency deviation estimation module, the output end of residual frequency deviation estimation module is connected with the input terminal of carrier wave adjustment module.
5. the device of cell searching in a kind of IOT-G system as described in claim 1, which is characterized in that the PBCH decoding
Module include it is sequentially connected go CP/FFT module, channel estimation frequency domain equalization module, solution prelist code layer mapping block, demodulation
It solves scrambling module, de-rate matcher block, Viterbi decoding module, CEC correction verification module, MIB bit flow module and determines cell
ID module composition.
6. small region search method in a kind of IOT-G system, using cell in IOT-G system a method as claimed in any one of claims 1 to 5
The device of search, which is characterized in that specifically include:
Step 1: SNR detection module is by receiving base band data, using primary synchronization signal PSS detection module, offset estimation and benefit
Repay module, secondary synchronization signal SSS detection module determines 20ms Timing Synchronization；
Step 1.1: ifPrimary synchronization signal PSS time domain data is formed according to PSS1 and PSS2, is directly passed to this
Ground primary synchronization signal PSS detection module；
Step 1.2: ifPrimary synchronization signal PSS time domain data is formed according to PSS2 and PSS1, is directly passed to this
Ground primary synchronization signal PSS detection module；
Step 1.3: local primary synchronization signal PSS detection module is directly and baseband signal is according to time domain sliding coherent detection, finds
Maximum value determines frame head；
Step 1.4: exchanging integral basis band signal and carry out offset estimation, carry out carrier wave adjustment；
Step 1.5: the 20ms frame head essence for carrying out primary synchronization signal PSS to baseband signal after carrier wave adjustment is synchronous, synchronizes tune
It is whole；
Step 1.6: according toTraversal generates all secondary synchronization signal SSS time domain datas, is directly passed to local auxiliary
Synchronization signal SSS detection module；
Step 1.7: baseband signal after synchronous adjustment detects secondary synchronization signal SSS according to time domain correlation to determine
Step 2: frequency offset estimation compensation module being sent into baseband signal after synchronous adjustment, determines carrier wave frequency deviation, carries out carrier wave adjustment；
Step 2.1: to baseband signal after synchronous adjustment, utilizing cyclic prefix CP in the time domain, determine fractional part of frequency offset, carried
Wave adjustment；
Step 2.2: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines integer frequency
Partially, carrier wave adjustment is carried out；
Step 2.3: to baseband signal after synchronous adjustment, primary synchronization signal PSS signal is utilized on frequency domain, determines residual frequency deviation,
Carry out carrier wave adjustment；
Step 3: is extracted by PBCH channel signal and is sent into PBCH decoding according to PBCH carrier frequency for baseband signal after Timing Synchronization
Module obtains system broadcasts MIB bit stream information；
Step 3.1: to the PBCH time-domain signal of extraction, passing to CP/FFT module, be removed CP, FFT transform, carrier wave is removed
Shifting processing, obtains frequency domain data；
Step 3.2: to frequency domain data, passing to channel estimation frequency domain equalization module, carry out local reference signal generation, channel is estimated
Meter and frequency domain equalization processing, go back original sender data；
Step 3.3: to data after equilibrium, passes to solution and prelist code layer mapping block, according to single antenna port and double antenna port,
Carry out solution precoding reconciliation layer mapping processing；
Step 3.4: to solution layer mapped data, passing to demodulation solution scrambling module, according to BPSK modulation, utilize parameter
Scramble sequence is generated, demodulation reconciliation scrambling processing is carried out；
Step 3.5: to data after solution scrambling, passing to de-rate matcher block, carry out solution rate-matched processing；
Step 3.6: to de-rate matched data, passing to Viterbi decoding module, carry out the processing of tail biting folding coding；
Step 3.7: to data after tail biting folding coding, passing to CRC check module, carry out CRC check processing；
Step 3.8: to data after CRC check, transmitting MIB bit flow module, according to system message composed structure, carry out MIB
Bit extraction process；
Step 3.9: data after extracting to MIB bit are transmitted and determine cell ID module, according to parameterAnd system information, it carries out
Cell ID determines processing.
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Application publication date: 20190405 |