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Method and device for reconstructing CP-OFDM signal in time-domain synchronous orthogonal frequency-division multiplexing system

A CP-OFDM and orthogonal frequency division technology, applied in the field of CP-OFDM signal reconstruction method and its device, can solve the problems of high implementation complexity, high power consumption, and great impact on receiving performance at the receiving end

Inactive Publication Date: 2010-02-17
TSINGHUA UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to propose a CP-OFDM signal reconstruction method and device in a TDS-OFDM system to solve the problem of high complexity, large amount of calculation, high power consumption, and poor reception performance at the receiving end in the existing TDS-OFDM system. Defects that are strongly affected by channel estimation

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  • Method and device for reconstructing CP-OFDM signal in time-domain synchronous orthogonal frequency-division multiplexing system
  • Method and device for reconstructing CP-OFDM signal in time-domain synchronous orthogonal frequency-division multiplexing system
  • Method and device for reconstructing CP-OFDM signal in time-domain synchronous orthogonal frequency-division multiplexing system

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Embodiment Construction

[0113] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0114] For the frame structure in the above-mentioned TDS-OFDM system, especially the frame header protection sequence in the frame structure, its specific implementation method can be:

[0115] The first implementation mode:

[0116] (i) Using a Fibonacci-type linear feedback shift register (LFSR) to generate a characteristic polynomial is x 8 +x 6 +x 5 The 8th-order PN sequence of +x+1, choose one of length N p =255 PN sequence (PN255) as "reference PN sequence";

[0117] (ii) PN sequence phase in frame i The L and PN sequences in the cyclic extension of the number of bits L and N p A non-prime positive integer L=165, resulting in length N G =420 frame header protection sequence;

[0118] The phases of the PN sequence in the frame structure of each signal frame obtained in this implementation manner are shown in the column c...

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Abstract

The invention provides a method for reconstructing a CP-OFDM signal in a time-domain synchronous orthogonal frequency-division multiplexing (TDS-OFDM) system. A novel frame structure is designed on asending end of the TDS-OFDM system; and a receiving terminal of the TDS-OFDM system utilizes the newly designed frame structure to reconstruct the CP-OFDM signal of frame body OFDM data through simpleadd-subtract operation. The method combines the characteristics of the TDS-OFDM system and a CP-OFDM system skillfully, replaces the prior method that the interference of PN on a data part is eliminated through multiple iterations to reconstruct a ZP-OFDM signal to further obtain the CP-OFDM signal in the TDS-OFDM system, reduces the complexity of the hardware implementation of the receiving endgreatly, and is particularly suitable for the mobile receiving of high-speed broadband.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to a CP-OFDM (Cyclic-Prefix OFDM, cyclic prefix OFDM) using TDS-OFDM (Time Domain Synchronous-Orthogonal Frequency Division Multiplexing, Time Domain Synchronous Orthogonal Frequency Division Multiplexing) technology ) Signal reconstruction method and device thereof. Background technique [0002] As a multi-carrier technology, OFDM is very effective in anti-ISI (Inter-Symbol Interference, Inter-Symbol Interference), which generally implements the elimination of ISI by inserting guard intervals between OFDM data blocks. But when the channel's maximum multipath delay exceeds the guard interval length, the performance of OFDM system will deteriorate sharply. In order to deal with the maximum multipath delay in the mobile environment, it is necessary to extend the guard interval at the cost of sacrificing spectral efficiency, or to increase the length o...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 符剑戴凌龙宋健王军王劲涛杨知行
Owner TSINGHUA UNIV
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