CN104283628B - A kind of method of cell searching in communication system - Google Patents
A kind of method of cell searching in communication system Download PDFInfo
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- CN104283628B CN104283628B CN201310283647.5A CN201310283647A CN104283628B CN 104283628 B CN104283628 B CN 104283628B CN 201310283647 A CN201310283647 A CN 201310283647A CN 104283628 B CN104283628 B CN 104283628B
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Abstract
A kind of method of cell searching in communication system, methods described includes：The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in the first synchronizing signal and obtains the first renewal synchronizing signal, the intersymbol interference between eliminating OFDM symbol in the second synchronizing signal obtains the second renewal synchronizing signal；The original position of synchronizing signal is updated using symbol timing detection first, combining the first local synchronizing signal carries out the channel estimation value that channel estimation obtains the first renewal synchronizing signal；Synchronizing signal being updated according to first and calculating the second original position for updating synchronizing signal, the second renewal synchronous signal sequence is worth to reference to the channel estimation of the first renewal synchronizing signal；Synchronous signal sequence cycle calculations synchronizing signal correlation is updated according to second using ergodic algorithm, and small district's groups ID is determined according to the position at strongest correlation peak.After using the embodiment of the present invention, the interference between OFDM symbol can be eliminated, and then accurately determine small district's groups ID.
Description
Technical field
The application is related to communication technical field, more particularly, to a kind of method of cell searching in communication system.
Background technology
The mandate frequency of power telecom network is discrete to be distributed in the frequency range of 223.525MHz~231.65MHz, totally 40, often
Individual bandwidth 25KHz, referred to as physics subband.Wherein 3, as synchronous subband, a subsynchronous letter are sent every a radio frames
Number, for cell searching, remaining 37 frequency is used as business subband.Every 40 radio frames are a cycle, with a frame as same
Step-frame, synchronizing signal is sent on all business subbands to be used to safeguard down-going synchronous, and remaining 39 radio frames is used for doing business.
In current power communication system, synchronizing channel is by the first synchronizing signal（PSC）With the second synchronizing signal（SSC）Group
Into.In time domain, the second synchronizing signal is arranged in front, and takes 462 sampled points.First synchronizing signal is placed on the second synchronous letter
Number afterwards, 463 sampled points are taken.Two synchronizing signals join end to end, and constitute 925 sampled points（925 are each subband 13
The time-domain sampling points of individual OFDM symbol）.
In cell search process, the first synchronizing signal of detection obtains Symbol Timing, then determines the using Symbol Timing
The original position of one synchronizing signal, combining the first local synchronizing signal carries out the channel that channel estimation obtains the first synchronizing signal
Estimate.The original position of the second synchronizing signal is calculated according to the first synchronizing signal, with reference to the channel estimation of the first synchronizing signal
It is worth and then obtains the second synchronous signal sequence.Using ergodic algorithm according to the second synchronous signal sequence cycle calculations synchronizing signal phase
Pass is worth, and the position according to strongest correlation peak determines small district's groups ID.
Due in cell search process, either in the channel estimation process of the first synchronizing signal, or calculating
During the second synchronizing sequence, OFDM（OFDM）The timing error of symbol can cause intersymbol interference, and then cause most
There is deviation in the position at strong correlation peak, reduce the accuracy of small district's groups ID detections.
The content of the invention
The method that the embodiment of the present invention proposes cell searching in a kind of communication system, can eliminate dry between OFDM symbol
Disturb, and then accurately determine small district's groups ID.
The technical scheme of the embodiment of the present invention is as follows：
A kind of method of cell searching in communication system, methods described includes：
The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in the first synchronizing signal and obtains the first renewal synchronization
Signal, the intersymbol interference between elimination OFDM symbol in the second synchronizing signal obtains the second renewal synchronizing signal；
The original position of synchronizing signal is updated using symbol timing detection first, combining the first local synchronizing signal is carried out
Channel estimation obtains the channel estimation value of the first renewal synchronizing signal；
Synchronizing signal being updated according to first and calculating the second original position for updating synchronizing signal, synchronous letter is updated with reference to first
Number channel estimation be worth to the second renewal synchronous signal sequence；
Synchronous signal sequence cycle calculations synchronizing signal correlation is updated according to second using ergodic algorithm, and according to most strong
The position of relevant peaks determines small district's groups ID.
The intersymbol interference eliminated in the first synchronizing signal between OFDM symbol obtains the first renewal synchronizing signal to be included：
Increase by 3 CP of sampled point length before first OFDM symbol time domain data, in other OFDM symbol time domain datas
2 cyclic prefix CPs of sampled point length of preceding increase.
The intersymbol interference eliminated in the second synchronizing signal between OFDM symbol obtains the second renewal synchronizing signal to be included：
Increase by 2 CP of sampled point length before each OFDM symbol time domain data.
As can be seen that eliminating OFDM symbol in the first synchronizing signal in embodiments of the present invention from above-mentioned technical proposal
Between intersymbol interference obtain the first renewal synchronizing signal, the intersymbol interference eliminated in the second synchronizing signal between OFDM symbol is obtained
Second updates synchronizing signal；The original position of synchronizing signal is updated using symbol timing detection first, combines local first same
Step signal carries out the channel estimation value that channel estimation obtains the first renewal synchronizing signal；Synchronizing signal is updated according to first calculate the
Two original positions for updating synchronizing signal, the second renewal synchronizing signal is worth to reference to the channel estimation of the first renewal synchronizing signal
Sequence；Synchronous signal sequence cycle calculations synchronizing signal correlation is updated according to second using ergodic algorithm, and according to most strong phase
The position of Guan Feng determines small district's groups ID.Code between due to having eliminated OFDM symbol in the first synchronizing signal and the second synchronizing signal
Between disturb, therefore can more be accurately positioned the position at strongest correlation peak, and then more accurately determine small district's groups ID.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram of cell searching in communication system.
Specific embodiment
Must be become more apparent to express the object, technical solutions and advantages of the present invention, below in conjunction with the accompanying drawings and specifically
The present invention is further described in more detail for embodiment.
In embodiments of the present invention, the intersymbol interference between the OFDM symbol of the first synchronizing signal is eliminated first, eliminates second
Intersymbol interference between synchronizing signal.It is determined that during small district's groups ID, due in channel estimation, and calculate second and update
During synchronous signal sequence, eliminating intersymbol interference reduces error, can more be accurately positioned the position at strongest correlation peak, Jin Ergeng
Plus accurately determine small district's groups ID.
It is the method flow schematic diagram of cell searching in communication system referring to accompanying drawing 1, specifically includes following steps：
101st, the intersymbol interference eliminated in the first synchronizing signal between OFDM symbol obtains the first renewal synchronizing signal, the
The intersymbol interference eliminated in two synchronizing signals between OFDM symbol obtains the second renewal synchronizing signal.
In current power communication system, the first synchronizing signal is generated by Zadoff-Chu sequence, by 62 the first of length
Synchronizing signal is divided into 7 sections, and every section of length is respectively 6,10,10,10,10,10,6 subcarriers, is respectively mapped to 7 OFDM
On symbol, two ends are to account for 6 OFDM symbols of subcarrier.7 frequency domain datas of OFDM symbol are 64 point IFFT respectively, generation
448 time domain datas of sampled point.It is finally unified to add 15 point CP totally 463 sampled points.
Second synchronizing signal concatenation of being interlocked by the binary sequence that two length is 31 is constituted.It is the second of length same by 62
Step signal is divided into 7 sections, and every section of length is respectively 6,10,10,10,10,10,6 subcarriers, is respectively mapped to 7 OFDM symbols
On number, two ends are to account for 6 OFDM symbols of subcarrier.7 frequency domain datas of OFDM symbol are 64 point IFFT, generation 448 respectively
The time domain data of individual sampled point.It is finally unified to add 14 point CP totally 462 sampled points.
When synchronizing signal is generated, because timing error can cause intersymbol interference between each OFDM symbol, therefore small
Need to eliminate the intersymbol interference between OFDM symbol before area searching.CP is added in each OFDM symbol of synchronizing signal,
Obtain updating synchronizing signal.
For the first synchronizing signal, CP can be in the following ways added.
First synchronizing signal is generated by Zadoff-Chu sequence, and the first synchronizing signal of 62 length is divided into 7 sections, every section
Length be respectively 6,10,10,10,10,10,6 subcarriers, be respectively mapped in 7 OFDM symbols, two ends are to account for 6 sons
The OFDM symbol of carrier wave.7 frequency domain datas of OFDM symbol are 64 point IFFT respectively, Jia 3 before first OFDM symbol time domain data
Point, adds 2 point CP before remaining each OFDM symbol time domain data, obtain the first renewal synchronizing signal, totally 463 sampled points.
For the second synchronizing signal, CP can be in the following ways added.
Second synchronizing signal concatenation of being interlocked by the binary sequence that two length is 31 is constituted, the second of length same by 62
Step signal is divided into 7 sections, and every section of length is respectively 6,10,10,10,10,10,6 subcarriers, is respectively mapped to 7 OFDM symbols
On number, two ends are to account for 6 OFDM symbols of subcarrier.7 frequency domain datas of OFDM symbol are 64 point IFFT, each OFDM respectively
Add 2 point CP before symbol time domain data, obtain the second renewal synchronizing signal, totally 462 sampled points.
102nd, small district's groups ID is determined by the first renewal synchronizing signal and the second renewal synchronizing signal.
The original position of synchronizing signal is updated using symbol timing detection first, combining the first local synchronizing signal is carried out
Channel estimation obtains the channel estimation value of the first renewal synchronizing signal.
Synchronizing signal being updated according to first and calculating the second original position for updating synchronizing signal, synchronous letter is updated with reference to first
Number channel estimation be worth to the second renewal synchronous signal sequence.
Synchronous signal sequence cycle calculations synchronizing signal correlation is updated according to second using ergodic algorithm, and according to most strong
The position of relevant peaks determines small district's groups ID.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in protection of the invention
Within the scope of.
Claims (1)
1. in a kind of communication system cell searching method, it is characterised in that methods described includes：
The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in the first synchronizing signal and obtains the first renewal synchronizing signal,
Intersymbol interference between eliminating OFDM symbol in the second synchronizing signal obtains the second renewal synchronizing signal；
The original position of synchronizing signal is updated using symbol timing detection first, combining the first local synchronizing signal carries out channel
Estimation obtains the channel estimation value of the first renewal synchronizing signal；
Synchronizing signal being updated according to first and calculating the second original position for updating synchronizing signal, synchronizing signal is updated with reference to first
Channel estimation is worth to the second renewal synchronous signal sequence；
Synchronous signal sequence cycle calculations synchronizing signal correlation is updated according to second using ergodic algorithm, and according to strongest correlation
The position at peak determines small district's groups ID；
Wherein, the intersymbol interference eliminated in the first synchronizing signal between OFDM symbol obtains the first renewal synchronizing signal bag
Include：
Increase by 3 CP of sampled point length before first OFDM symbol time domain data, increase before other OFDM symbol time domain datas
Plus 2 cyclic prefix CPs of sampled point length；
The intersymbol interference eliminated in the second synchronizing signal between OFDM symbol obtains the second renewal synchronizing signal to be included：
Increase by 2 CP of sampled point length before each OFDM symbol time domain data.
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| CN108631843B (en) * | 2017-03-23 | 2021-06-18 | 展讯通信（上海）有限公司 | Method and device for sending and receiving scanning beam |
| CN111212008A (en) * | 2018-11-21 | 2020-05-29 | 普天信息技术有限公司 | Synchronization signal sending method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656700A (en) * | 2008-08-19 | 2010-02-24 | 中兴通讯股份有限公司 | Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system |
| CN101682498A (en) * | 2007-05-17 | 2010-03-24 | Lg电子株式会社 | Method of transmitting synchronization signal in wireless communication system |
| CN101772914A (en) * | 2007-08-03 | 2010-07-07 | 高通股份有限公司 | Method and apparatus for determining cell timing in a wireless communication system |
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| US8170592B2 (en) * | 2008-09-12 | 2012-05-01 | Broadcom Corporation | Method and system for frame timing acquisition in evolved universal terrestrial radio access (EUTRA) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682498A (en) * | 2007-05-17 | 2010-03-24 | Lg电子株式会社 | Method of transmitting synchronization signal in wireless communication system |
| CN101772914A (en) * | 2007-08-03 | 2010-07-07 | 高通股份有限公司 | Method and apparatus for determining cell timing in a wireless communication system |
| CN101656700A (en) * | 2008-08-19 | 2010-02-24 | 中兴通讯股份有限公司 | Method and device for detecting cyclic prefix type during initial cell search in long-term evolution system |
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