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Pilot frequency sequence structure used in OFDM/OQAM system and the construction method thereof

A technology of pilot sequence and construction method, applied in the field of channel estimation, to avoid complex calculations, reduce hardware implementation difficulty and system cost

Inactive Publication Date: 2009-06-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The present invention provides a new pilot design structure and method for the problem of channel estimation in the existing OFDM / OQAM system

Method used

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  • Pilot frequency sequence structure used in OFDM/OQAM system and the construction method thereof
  • Pilot frequency sequence structure used in OFDM/OQAM system and the construction method thereof
  • Pilot frequency sequence structure used in OFDM/OQAM system and the construction method thereof

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Embodiment 1

[0034] All even-numbered symbols in the main sequence part of the pilot sequence are all 1 (or all are -1), and all odd-number symbols are all -1 (or all are 1). The method to construct this sequence is:

[0035] Step 1: Set all the symbols of odd serial numbers in the main sequence part of the pilot sequence to 1 (a 1 =a 3 =a 5 ...=a 2m+1 = 1) or -1 (a 1 =a 3=a 5 ...=a 2m+1 =-1), when the symbol of each bit in the odd serial number is 1 (a 1 =a 3 =a 5 ...=a 2m+1 = 1), then all the symbols of the even-numbered serial numbers in the main sequence part of the pilot sequence are set to -1 (a 0 =a 2 =a 4 ...=a 2m =-1); when the symbols of the odd sequence numbers in the main sequence part of the pilot sequence are -1 (a 1 =a 3 =a 5 ...=a 2m+1 =-1), then the values ​​of the symbols of the even numbered numbers in the main sequence part of the pilot sequence are all set to 1 (a 0 =a 2 =a 4 ...=a 2m = 1).

[0036] Step 2: Add protection symbols with the number ...

Embodiment 2

[0038] All symbols in the main body of the pilot sequence are all 1 or all -1. The method to construct this sequence is:

[0039] Step 1: Set all symbols in the main part of the pilot sequence to 1 (a 1 =a 2 =a 3 ...=a n = 1) or -1 (a 1 =a 2 =a 3 ...=a n =-1)

[0040] Step 2: Add all 0 protection symbols with the number of subcarriers on both sides of the main sequence part.

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Abstract

The invention provides a pilot frequency sequence structure used in OFDM / OQAM system and the construction method thereof; under the condition that two sides of pilot frequency reference channel are added by full 0 protection symbol, the odd number sequence number and even number sequence number of the sequence body part have the same symbols, so when the interference between symbols is removed, while the interference between sub-carriers in pilot frequency reference signals is removed. More important, through the pilot frequency signal design method of the invention, the receiving end channel does not need forming blurry function characteristic in estimating process, so, the receiving end avoids the complex calculation in signal processing, and greatly reduces the hardware implementing difficulty and system cost in OFDM / OQAM system. The invention is particularly suitable for the self-adapting OFDM / OQAM system and high-speed OFDM / OQAM system.

Description

technical field [0001] The invention belongs to the channel estimation technology in the OFDM / OQAM system, in particular to the structure design of the pilot signal in the channel estimation technology. Background technique [0002] As we all know, in the existing communication technology, the Orthogonal Frequency Division Multiple Access technology (OFDM / offset QAM, referred to as OFDM / OQAM) based on the interleaved quadrature amplitude modulation method is characterized by its high spectrum utilization and good time-frequency focus. It has become one of the main candidate technologies for future mobile multimedia communication. [0003] The mathematical expression of the transmitted signal s(t) of the OFDM / OQAM system is: [0004] s ( t ) = Σ n Σ m = 0 M - ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 胡苏武刚李少谦符初生
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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