CN104283823B - A kind of method that Reference Signal Received Power is determined in communication system - Google Patents
A kind of method that Reference Signal Received Power is determined in communication system Download PDFInfo
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- CN104283823B CN104283823B CN201310283690.1A CN201310283690A CN104283823B CN 104283823 B CN104283823 B CN 104283823B CN 201310283690 A CN201310283690 A CN 201310283690A CN 104283823 B CN104283823 B CN 104283823B
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Abstract
A kind of method that Reference Signal Received Power is determined in communication system, methods described include：The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in synchronizing signal to obtain updating synchronizing signal；Reference Signal Received Power RSRP is determined using the renewal synchronizing signal.After the embodiment of the present invention, synchronizing signal measurement RSRP can be utilized, improves RSRP accuracy.
Description
Technical field
The application is related to communication technical field, and work(is received more particularly, to determination reference signal in a kind of communication system
The method of rate.
Background technology
The mandate frequency of power telecom network is discrete to be distributed in 223.525MHz~231.65MHz frequency range, totally 40, often
Individual bandwidth 25KHz, referred to as physics subband.The synchronous subband of wherein 3 conducts, a subsynchronous letter is sent every a radio frames
Number, for cell searching.
In current power communication system, pass through Physical Broadcast Channel（PBCH）Pilot tone calculate Reference Signal Received Power
（RSRP）.RSRP purposes has：It is resident in cell searching flow by RSRP in correspondingly cell, foundation is cut after measuring adjacent area RSRP
Change criterion and carry out cell switching.
Current PBCH channel pilot frequencies amount to 13.Due to PBCH channel pilot frequency limited amounts, under Complex Channel environment, and
RSRP can not be reflected well, so fault rate increases when cell searching persistent district judges and cell switches.
The content of the invention
The embodiment of the present invention proposes a kind of method that Reference Signal Received Power is determined in communication system, can utilize synchronous
Signal measurement RSRP, improve RSRP accuracy.
The technical scheme of the embodiment of the present invention is as follows：
A kind of method that Reference Signal Received Power is determined in communication system, methods described include：
The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in synchronizing signal to obtain updating synchronizing signal；
Reference Signal Received Power RSRP is determined using the renewal synchronizing signal.
The intersymbol interference eliminated in synchronizing signal between OFDM symbol, which obtains renewal synchronizing signal, to be included：In synchronous letter
Number each OFDM symbol in add cyclic prefix CP, obtain update synchronizing signal.
The synchronizing signal is the first synchronizing signal, and the CP that added in each OFDM symbol of synchronizing signal includes：
Increase the CP of 3 sampled point length before first OFDM symbol time domain data, increase by 2 before other OFDM symbol time domain datas
The CP of sampled point length.
The synchronizing signal is the second synchronizing signal, and the CP that added in each OFDM symbol of synchronizing signal includes：
Increase the CP of 2 sampled point length before each OFDM symbol time domain data.
The synchronizing signal is that the ratio of the first synchronizing signal and the second synchronizing signal is a/b, and a, b are first, respectively
The weighted factor of two synchronizing signals, 0 ＜ a≤1,0 ＜ b≤1 are described that CP bags are added in each OFDM symbol of synchronizing signal
Include：
In the first synchronizing signal：Increase the CP of 3 sampled point length before first OFDM symbol time domain data, other
Increase the CP of 2 sampled point length before OFDM symbol time domain data；
In the second synchronizing signal：Increase the CP of 2 sampled point length before each OFDM symbol time domain data.
It is described to determine that RSRP includes using the renewal synchronizing signal：
Utilize the sampled point of the renewal synchronizing signal in renewal synchronizing signal, Measurement bandwidth in an OFDM symbol
Number, the OFDM symbol number for updating synchronizing signal and channel response determine RSRP.
From above-mentioned technical proposal as can be seen that between OFDM symbol is eliminated in synchronizing signal in embodiments of the present invention
Intersymbol interference obtains updating synchronizing signal；Because renewal synchronizing signal has more multi-point sampling under same band, therefore, utilize
The renewal synchronizing signal determines RSRP.In such manner, it is possible to measure RSRP using the synchronizing signal possessed compared with multi-point sampling, improve
RSRP accuracy.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram that Reference Signal Received Power is determined in communication system.
Embodiment
It must be more clearly understood 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, due in power telecom network synchronizing signal bandwidth and PBCH channel widths be identical
's.And due to the number of the unnecessary PBCH channel pilot frequencies of sampled point number in synchronizing signal.Therefore, eliminated in synchronizing signal
After intersymbol interference between OFDM symbol, it is possible to calculate RSRP.The gain of sampling number purpose, which can improve, calculates the accurate of RSRP
Property.
Referring to accompanying drawing 1 be in communication system determine Reference Signal Received Power method flow schematic diagram, specifically include with
Lower step：
101st, the intersymbol interference between OFDM symbol is eliminated in synchronizing signal to obtain updating synchronizing signal.
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
After number, 463 sampled points are taken.Two synchronizing signals join end to end, and form 925 sampled points（925 be each subband 13
The time-domain sampling points of individual OFDM symbol）.
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, both ends is account for 6 sons
The OFDM symbol of carrier wave.The frequency domain data of 7 OFDM symbols is 64 point IFFT respectively, generates the time domain data of 448 sampled points.
Finally unify to add 15 point CP totally 463 sampled points.
Second synchronizing signal is made up of the binary sequence concatenation of interlocking that two length are 31.It is same by the second of 62 length
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, both ends are the OFDM symbol for accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbols does 64 point IFFT, generation 448 respectively
The time domain data of individual sampled point.Finally unify to add 14 point CP totally 462 sampled points.
When current synchronizing signal generates, because timing error can cause intersymbol interference between each OFDM symbol, therefore
Needing to eliminate the intersymbol interference between OFDM symbol before determining RSRP using synchronizing signal.I.e. in each of synchronizing signal
CP is added in OFDM symbol, obtains updating synchronizing signal.
When the synchronizing signal used for calculating RSRP is the first synchronizing signal, CP can be added in the following ways.
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, both ends is account for 6 sons
The OFDM symbol of carrier wave.The frequency domain data of 7 OFDM symbols is 64 point IFFT respectively, adds 3 before first OFDM symbol time domain data
Point, before remaining each OFDM symbol time domain data plus 2 point CP, totally 463 sampled points.
When the synchronizing signal used for calculating RSRP is the second synchronizing signal, CP can be added in the following ways.
Second synchronizing signal is made up of the binary sequence concatenation of interlocking that two length are 31, same by the second of 62 length
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, both ends are the OFDM symbol for accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbols is 64 point IFFT, each OFDM respectively
Add 2 point CP before symbol time domain data, totally 462 sampled points.
When the synchronizing signal used for calculating RSRP is the first synchronizing signal and the second synchronizing signal, it can utilize synchronous
The weighted average of signal and the second synchronizing signal determines RSRP, i.e. the ratio of the first synchronizing signal and the second synchronizing signal is a/b,
A, b are the weighted factor of first, second synchronizing signal respectively, 0 ＜ a≤1,0 ＜ b≤1.
For the first synchronizing signal, the CP of 3 sampled point length of increase before first OFDM symbol time domain data, other
Increase the CP of 2 sampled point length before OFDM symbol time domain data.
For in the second synchronizing signal：Increase the CP of 2 sampled point length before each OFDM symbol time domain data.
102nd, RSRP is determined using updating synchronizing signal in cell search process.The renewal synchronizing signal of transmission is：
XK, l, K is the sampled point number of the renewal synchronizing signal in an OFDM symbol in Measurement bandwidth, and L is renewal synchronizing signal
OFDM symbol number, HK,LIt is channel response.Because X is constant modulus signals, then have：
The foregoing is only a preferred embodiment 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., the protection of the present invention should be included in
Within the scope of.
Claims (2)
1. the method for Reference Signal Received Power is determined in a kind of communication system, it is characterised in that methods described includes：
The intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM is eliminated in synchronizing signal to obtain updating synchronizing signal；
Reference Signal Received Power RSRP is determined using the renewal synchronizing signal；
The intersymbol interference eliminated in synchronizing signal between OFDM symbol, which obtains renewal synchronizing signal, to be included：In synchronizing signal
Cyclic prefix CP is added in each OFDM symbol, obtains updating synchronizing signal；
The synchronizing signal is the first synchronizing signal, and the CP that added in each OFDM symbol of synchronizing signal includes：In head
Increase the CP of 3 sampled point length before individual OFDM symbol time domain data, increase by 2 samplings before other OFDM symbol time domain datas
The CP of point length；
Or the synchronizing signal is the second synchronizing signal, the CP that added in each OFDM symbol of synchronizing signal includes：
Increase the CP of 2 sampled point length before each OFDM symbol time domain data；
Or the synchronizing signal is that the ratio of the first synchronizing signal and the second synchronizing signal is a/b, a, b are first, respectively
The weighted factor of two synchronizing signals, 0 ＜ a≤1,0 ＜ b≤1 are described that CP bags are added in each OFDM symbol of synchronizing signal
Include：
In the first synchronizing signal：Increase the CP of 3 sampled point length before first OFDM symbol time domain data, in other OFDM
Increase the CP of 2 sampled point length before symbol time domain data；
In the second synchronizing signal：Increase the CP of 2 sampled point length before each OFDM symbol time domain data.
2. the method for Reference Signal Received Power is determined in communication system according to claim 1, it is characterised in that the profit
Determine that RSRP includes with the renewal synchronizing signal：
Using update synchronizing signal, the sampled point number of the renewal synchronizing signal in Measurement bandwidth in an OFDM symbol,
The OFDM symbol number and channel response for updating synchronizing signal determine RSRP.
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| CN102804840A (en) * | 2009-06-22 | 2012-11-28 | 高通股份有限公司 | Method and apparatus for network optimization using SON solutions |
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| Title |
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| TD-LTE终端一致性测试容限与参考信号测量的研究;夏璐;《中国优秀硕士学位论文全文数据库》;20111015;第1-75页 * |
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