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OFDM frequency-offset estimating method based on allocycly adjacent structure

A short cycle, frequency synchronization technology, applied in the field of communication, to achieve the effect of high precision and large range of frequency offset estimation

Inactive Publication Date: 2007-08-22
SHENZHEN TINNO WIRELESS TECH
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Problems solved by technology

Since the period of the traditional cyclic prefix is ​​the data length N of the OFDM symbol, the frequency offset estimation range of this frequency offset estimation method is not greater than half the subcarrier interval

Method used

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  • OFDM frequency-offset estimating method based on allocycly adjacent structure
  • OFDM frequency-offset estimating method based on allocycly adjacent structure
  • OFDM frequency-offset estimating method based on allocycly adjacent structure

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The cyclic prefix of the OFDM symbol sent at the transmitting end of the OFDM system is an OFDM cyclic prefix (Heter-cycle abutted CP, HCA-CP) proposed by the present invention. As shown in Figure 2, the cyclic prefix is ​​determined by the CP 1 and CP 2 It consists of two parts: the first part is the replication of the front part of the effective data symbol (length N) of OFDM (referred to as the short-period cyclic prefix CP 1 / Sc-CP), length L 1 ; The second part is the replication of the tail part of the OFDM effective data symbol (referred to as the long-period cyclic prefix CP 2 / Lc-CP), the length is L 2 , therefore, the length of the entire cyclic prefix is ​​L (L=L 1 +L 2 )CP 1 The corresponding symbol period is L, and CP 2 The corresponding symbol period is N. The cyclic prefix of the adjacent structure of different periods i...

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Abstract

An OFDM frequency deviation estimating method based on allocycle adjacent structure includes designing an OFDM circulation prefix of allocycle adjacent structure, adding designed circulation prefix at front end of OFDM effective data to form an OFDM symbol being sent out through channel, carrying out time synchronization and frequency synchronization at receiving end according to OFDM symbol.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to the demodulation technology of the communication system. Background technique [0002] At present, with the rapid growth of demand for new communication services, higher requirements are placed on the transmission rate of wireless communication systems and wireless local area networks, and the increase in transmission rate brings inter-symbol interference (ISI) and The problem of deep frequency selective fading. At present, there are two ways to solve this problem. One is to use Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing), that is, to disperse high-speed data to several sub-carriers for parallel transmission at a low rate; the other is to use A single-carrier system that simply introduces a cyclic prefix. Both methods require cyclic prefix insertion and frequency domain equalization. Since both methods transmit signals in ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L12/56H04L27/38
Inventor 饶志华邝育军隆克平陈前斌李云龙灿董静黄琼聂能
Owner SHENZHEN TINNO WIRELESS TECH
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