CN102045292A - Synchronous sequence construction method for cooperative relay system - Google Patents

Synchronous sequence construction method for cooperative relay system Download PDF

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Publication number
CN102045292A
CN102045292A CN2010105891625A CN201010589162A CN102045292A CN 102045292 A CN102045292 A CN 102045292A CN 2010105891625 A CN2010105891625 A CN 2010105891625A CN 201010589162 A CN201010589162 A CN 201010589162A CN 102045292 A CN102045292 A CN 102045292A
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sequence
cycle
relay
constructed
synchronizing
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CN2010105891625A
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Chinese (zh)
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CN102045292B (en
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蒋雁翔
尤肖虎
高西奇
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东南大学
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Abstract

The invention discloses a synchronous sequence construction method for a cooperative relay system and relates to a design method for constructing a synchronous training sequence by utilizing constant amplitude zero autocorrelation base sequences and suitable for the cooperative relay system. The constructed synchronous sequence consists of two parts, wherein the first part consists of unequal period short base sequences; and the second part consists of long base sequences. Timing offset estimation can be finished according to the unequal period short base sequences in the constructed synchronous sequence; frequency offset estimation can be finished according to the long base sequences in the constructed synchronous sequence; and a related timing offset estimation algorithm only needs simple autocorrelation and crosscorrelation operation. By the synchronous sequence construction method provided by the invention, the problems of multi-timing offset and multi-frequency offset peculiar to the cooperative relay system are effectively solved; and a sequence-based synchronous algorithm is low in computational complexity and is high in estimated performance.

Description

Collaborative relay system synchronizing sequence building method

Technical field

The present invention is a kind of synchronizing sequence building method that can be applicable in the collaborative relay communications system, belongs to the simultaneous techniques field in the mobile communication.

Background technology

Traditional basic problem that cellular communication system faced is that the limited communication reliability that causes with timely change multipath fading of capacity that is caused by finite bandwidth descends.If continue to take this network configuration, can't adapt to the requirement of following wireless application.Relaying technique is by placing the relatively simply fixing or mobile-relay station of some functions and amplify or decipher the signal between repeating base station and the mobile subscriber in cellular cell, can reduce the transmitting power of signal, extend the coverage of base station, eliminate coverage hole, thereby can reduce cost effectively.Further, collaborative relaying technique can utilize space diversity further to resist the multipath fading of wireless channel, overcome shadow effect, thereby further strengthen communication quality by the cooperation between the relaying, improves spectrum efficiency.

Yet, in the cooperating relay system, not because not matching mutually between different and a plurality of crystal oscillators of relaying location distribution, have a plurality of different timing slips and a plurality of different carrier frequency shifts between a plurality of repeated links, this is the most remarkable part that the cooperating relay system is different from traditional Point-to-Point Communication System.Therefore, need the efficient synchronization sequence constructing method of research at the cooperating relay system.

Summary of the invention

Technical problem: the objective of the invention is provides a kind of synchronizing sequence building method that can effectively estimate a plurality of timing slips and a plurality of frequency shift (FS)s in collaborative relay system.The synchronizing sequence that is constructed has and generates simple, the low advantage of system load, and has lower computation complexity based on timing estimation and the frequency deviation estimating method of institute's tectonic sequence, but the while can reach gratifying systematic function requirement.

Technical scheme: the present invention is based on that the communication for coordination relay system put forward at the existing a plurality of timing slips of this system and a plurality of this problem of frequency shift (FS).The synchronizing sequence that is suitable for collaborative relay system that utilizes the permanent width of cloth zero autocorrelation sequence to construct, whole sequence is made of two parts, finish respectively thick timing estimation,

-1-

Thin timing estimation and decimal frequency bias are estimated, integer frequency bias is estimated; The first of sequence is not by waiting short basic sequence of cycle to constitute, and wherein, its cycle of the basic sequence of weak point of not waiting the cycle mainly to refer to corresponding each collaborative relaying has nothing in common with each other, and the second portion of sequence waits long basic sequence of cycle to constitute by two; Short basic sequence adopts the permanent width of cloth zero autocorrelation sequence and makes full use of its good auto-correlation with cross correlation properties to overcome owing to influence the relay well interference that is brought partially with multifrequency partially for a long time; Also adopt the permanent width of cloth zero autocorrelation sequence with the corresponding frequency domain sequence of long basic sequence and make full use of its good auto-correlation with cross correlation properties to optimize decimal frequency bias estimation and integer frequency bias estimation performance simultaneously.

Its sequence structure concrete grammar is as follows:

1.) K cycle of structure is respectively L 1, L 2, L L KDo not wait short basic sequence of cycle, and make it satisfy the permanent width of cloth zero automatic correlative property, wherein, K is the number of via node in the collaborative relay system;

2.) cycle repeats the basic sequence of above-mentioned weak point respectively, forms K the first corresponding to each relay synchronization sequence that length is N, and wherein, N is the data frame length of relay system, and its data are taken as 2 power, and can be decomposed into N=PQ and P, Q are arranged all be integer;

3.) structure length is the permanent width of cloth zero autocorrelation sequence of P, wherein, and P<N and P=N/Q is arranged;

4.) sequence that step 3 constructed is done even zero insertion operation, be extended to the sequence that length is N=PQ;

5.) sequence that step 4 constructed is done K ring shift right bit manipulation respectively, the displacement side-play amount is respectively 0, m, and 2m, L, (K-1) m, wherein, Be basic displacement length, For rounding operator;

6.) K the sequence that step 5 constructed done anti-discrete Fourier transform (DFT) computing respectively, and the cycle repeat once, obtain K length and be the second portion of 2N corresponding to the synchronizing sequence of each relaying;

7.) insert zero prefix, between the first of the synchronizing sequence of being constructed and second portion, insert Cyclic Prefix, then obtain final synchronizing sequence corresponding to K relaying in the front of the first of the synchronizing sequence of being constructed.

Beneficial effect:

1, in the cooperating relay communication system, sequence constructing method proposed by the invention is simple, and the low complex degree that is beneficial to transmitter is realized;

2, based on sequence constructing method proposed by the invention, timing estimation in the receiver and frequency offset estimating algorithm only need be done simple auto-correlation and computing cross-correlation just can obtain good estimated performance, and the low complex degree that is beneficial to receiver is realized;

3, sequence constructing method proposed by the invention can extend in other communication systems such as distributing antenna system, wireless sensor network, self-organization network.

-2-

Description of drawings

Fig. 1 is a cooperating relay system model block diagram.

Fig. 2 is a synchronizing sequence overall structure schematic diagram.

Fig. 3 is the structural representation of the short-and-medium basic sequence of synchronizing sequence (SBS) part.

Fig. 4 is the frequency domain sequence structural representation corresponding to long basic sequence (LBS) part in the synchronizing sequence.

Fig. 5 is the implementation structure schematic diagram of the collaborative relay system synchronizing sequence building method that proposed.

Embodiment

According to the implementation structure schematic diagram of synchronizing sequence overall structure schematic diagram shown in Figure 2 and collaborative relay system synchronizing sequence building method shown in Figure 5, the specific implementation step that provides the synchronizing sequence that proposes is as follows:

A) structure K does not wait the cycle (cycle is respectively L 1, L 2, L L K) the basic sequence of weak point, and make it satisfy the permanent width of cloth zero automatic correlative property;

B) cycle repeats the basic sequence of above-mentioned weak point respectively, forms K the first corresponding to each relay synchronization sequence that length is N;

C) structure length is the permanent width of cloth zero autocorrelation sequence of P;

D) sequence that step 3 constructed is done even zero insertion operation, be extended to the sequence that length is N=PQ;

E) to the sequence that step 4 constructed do respectively K ring shift right bit manipulation (displacement side-play amount be respectively 0, m, 2m, L, (K-1) m, wherein, For rounding operator);

F) K the sequence that step 5 constructed done anti-discrete Fourier transform (DFT) computing respectively, and the cycle repeat once, obtain K length and be the second portion of 2N corresponding to the synchronizing sequence of each relaying;

G) insert zero prefix in the front of the first of the synchronizing sequence of being constructed, between the first of the synchronizing sequence of being constructed and second portion, insert Cyclic Prefix, then obtain final synchronizing sequence corresponding to K relaying.

Claims (2)

1. collaborative relay system synchronizing sequence building method, the synchronizing sequence that is suitable for collaborative relay system that it is characterized in that utilizing the permanent width of cloth zero autocorrelation sequence to construct, whole sequence is made of two parts, finishes thick timing estimation, thin timing estimation and decimal frequency bias estimation, integer frequency bias respectively and estimates; The first of sequence is not by waiting short basic sequence of cycle to constitute, and wherein, its cycle of the basic sequence of weak point of not waiting the cycle mainly to refer to corresponding each collaborative relaying has nothing in common with each other, and the second portion of sequence waits long basic sequence of cycle to constitute by two; Short basic sequence adopts the permanent width of cloth zero autocorrelation sequence and makes full use of its good auto-correlation with cross correlation properties to overcome owing to influence the relay well interference that is brought partially with multifrequency partially for a long time; Also adopt the permanent width of cloth zero autocorrelation sequence with the corresponding frequency domain sequence of long basic sequence and make full use of its good auto-correlation with cross correlation properties to optimize decimal frequency bias estimation and integer frequency bias estimation performance simultaneously.
2. collaborative relay system synchronizing sequence building method according to claim 1 is characterized in that the method for this structure is specially:
1.) K cycle of structure is respectively L 1, L 2, L L KDo not wait short basic sequence of cycle, and make it satisfy the permanent width of cloth zero automatic correlative property, wherein, K is the number of via node in the collaborative relay system;
2.) cycle repeats the basic sequence of above-mentioned weak point respectively, forms K the first corresponding to each relay synchronization sequence that length is N, and wherein, N is the data frame length of relay system, and its data are taken as 2 power, and can be decomposed into N=PQ and P, Q are arranged all be integer;
3.) structure length is the permanent width of cloth zero autocorrelation sequence of P, wherein, and P<N and P=N/Q is arranged;
4.) sequence that step 3 constructed is done even zero insertion operation, be extended to the sequence that length is N=PQ;
5.) sequence that step 4 constructed is done K ring shift right bit manipulation respectively, the displacement side-play amount is respectively 0, m, and 2m, L, (K-1) m, wherein, Be basic displacement length, For rounding operator;
6.) K the sequence that step 5 constructed done anti-discrete Fourier transform (DFT) computing respectively, and the cycle repeat once, obtain K length and be the second portion of 2N corresponding to the synchronizing sequence of each relaying;
7.) insert zero prefix, between the first of the synchronizing sequence of being constructed and second portion, insert Cyclic Prefix, then obtain final synchronizing sequence corresponding to K relaying in the front of the first of the synchronizing sequence of being constructed.
CN 201010589162 2010-12-15 2010-12-15 Synchronous sequence construction method for cooperative relay system CN102045292B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103701733A (en) * 2013-09-28 2014-04-02 河北工业大学 TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system
CN104066147A (en) * 2013-03-19 2014-09-24 中兴通讯股份有限公司 Network node searching method, device and equipment based on downlink detection reference signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1805422A (en) * 2005-01-13 2006-07-19 三星电子株式会社 Method for transmitting and receiving preamble sequences in an orthogonal frequency division multiplexing communication system using a multiple input multiple output scheme
WO2006137023A2 (en) * 2005-06-24 2006-12-28 Koninklijke Philips Electronics N.V. Method and apparatus for synchronization in wireless communication system
CN101079688A (en) * 2006-05-23 2007-11-28 中兴通讯股份有限公司 A synchronization method in orthogonal frequency division multiplexing system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1805422A (en) * 2005-01-13 2006-07-19 三星电子株式会社 Method for transmitting and receiving preamble sequences in an orthogonal frequency division multiplexing communication system using a multiple input multiple output scheme
WO2006137023A2 (en) * 2005-06-24 2006-12-28 Koninklijke Philips Electronics N.V. Method and apparatus for synchronization in wireless communication system
CN101079688A (en) * 2006-05-23 2007-11-28 中兴通讯股份有限公司 A synchronization method in orthogonal frequency division multiplexing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104066147A (en) * 2013-03-19 2014-09-24 中兴通讯股份有限公司 Network node searching method, device and equipment based on downlink detection reference signal
CN103701733A (en) * 2013-09-28 2014-04-02 河北工业大学 TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system
CN103701733B (en) * 2013-09-28 2017-03-01 河北工业大学 A kind of method of TD LTE relay system offset estimation

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