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Matrix block interveaving method and device for reducing OFDM system peak-to-average power ratio

A peak-to-average power ratio and matrix block technology, applied in the field of communication, can solve the problems of increasing OFDM system processing delay, greatly reducing PAPR performance, increasing the difficulty of system synchronization and channel estimation, etc.

Inactive Publication Date: 2007-07-25
XIDIAN UNIV
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Problems solved by technology

[0013] Although random interleaving can effectively reduce the PAPR of the OFDM system with a small redundancy, each new sequence requires N iterations, and the whole process requires N×(K-1) iterations, which greatly increases It reduces the processing delay of the OFDM system, and also greatly increases the difficulty of system synchronization and channel estimation
Although OFDM symbols can be transformed by a simpler interleaving method (such as periodic interleaving), its PAPR performance will also drop a lot, which will affect the correct reception of OFDM symbols by the receiver.

Method used

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  • Matrix block interveaving method and device for reducing OFDM system peak-to-average power ratio

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Embodiment Construction

[0064] The present invention will be described in further detail below with reference to the accompanying drawings.

[0065] With reference to Fig. 1, be used for the matrix block interleaving method of the present invention in OFDM system, carry out in the following steps at sending end and receiving end:

[0066] The first step, according to the number N of OFDM subcarriers, determine the number of rows and columns P and Q of the matrix A to be divided, where P×Q=N;

[0067] After the number of rows and columns P and Q are determined, the number of rows and columns does not need to be re-determined for the input OFDM symbol. The selection of P and Q should make P and Q as close as possible, which will be beneficial to the selection of subsequent segmentation points. For example, when N is 128, P=8 and Q=16 can be selected instead of P=4 and Q=32.

[0068] In the second step, according to P and Q, the OFDM parallel input sequence S is transformed into a matrix A whose number...

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Abstract

The method is based on the relationship between the autocorrelation of OFDM modulation signal and the PAPR, uses matrices- partitioning interlace approach to rearrange the parallel input sequence of OFDM modulation signals in many times, and selects the sequence with lowest correlation to make the modulus value of its non-cyclic autocorrelation coefficient to be minimal so as to effectively reduce PAPA and the system processing time delay. The apparatus comprises a sending end and a receiving end. The sending end mainly comprises matrices-partitioning interlace unit, PAPR calculation comparator and output sequence selector. The receiving end comprises, the matrices-partitioning de-interlace unit. Said matrices-partitioning interlace unit comprises matrix forming unit, partitioning-point selecting unit, matrix partitioning unit, matrix reading unit and combinational unit. The matrices-partitioning de-interlace unit comprises: separation unit, matrices-partitioning combinational unit and matrix reading unit.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to the reduction of the peak-to-average power ratio PAPR (Peak-to-Average Power Ratio) in an Orthogonal Frequency Division Multiplexing (OFDM) communication system, specifically an OFDM system that effectively reduces the Matrix block interleaving method and device for peak-to-average power ratio and system processing delay reduction Background technique [0002] Orthogonal frequency division multiplexing OFDM technology is considered to be one of the core technologies of the fourth generation of mobile communication 4G because of its efficient spectrum utilization and good anti-multipath fading performance. At present, OFDM technology has been used in asymmetric digital subscriber line ( ADSL), digital audio broadcasting (DAB) and digital television broadcasting (DVB), IEEE 802.11, IEEE 802.16, and power line broadband data communications have been widely used. [0003] The ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04B1/707H04L1/00
Inventor 杨刚王科研
Owner XIDIAN UNIV
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