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STBC-OFDM signal blind recognition algorithm based on K-S detection

A blind recognition, signal technology, applied in the field of signal processing

Active Publication Date: 2017-02-08
NAVAL AVIATION UNIV
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is, aiming at the deficiencies of the existing STBC blind recognition technology, considering the frequency selective Rayleigh channel model, a kind of STBC-OFDM signal blind recognition method based on K-S detection is proposed, which can meet the requirements of STBC-OFDM signal recognition. requirements, greatly improving the performance of the recognition algorithm, and has a lower computational complexity

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  • STBC-OFDM signal blind recognition algorithm based on K-S detection
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  • STBC-OFDM signal blind recognition algorithm based on K-S detection

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Embodiment Construction

[0073] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0074] figure 1 It is an overall flow chart of the present invention, and the implementation process of the method described in this embodiment is as follows:

[0075] (1) intercepting the STBC-OFDM signal y(k) of a single receiving antenna;

[0076] (2) Group the intercepted signal y(k) in units of OFDM blocks, define a new OFDM block matrix R, and define two new lengths N B -t block matrix R 0 and R 1 ,

[0077] (3) and calculate the autocorrelation vector X of the column vector i ;

[0078] (4) Calculate the threshold value β;

[0079] (5) Find the empirical cumulative distribution function F i (z), and calculate F i The maximum distance between (z)

[0080] (6) if Judgment H 0 established, otherwise determine H 1 established.

[0081] In the embodiment: the OFDM signal is based on the IEEE802.11e standard, the number of OF...

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Abstract

The invention discloses as STBC-OFDM signal blind recognition method based on K-S detection, and the method comprises the steps: firstly enabling a received signal to be redefined as two different signal sequences; secondly respectively solving the time delay correlation functions of the two signal sequences, and analyzing the distribution conditions of two time delay correlation functions of different STBCs; and finally employing a method based on K-S detection to recognize different STBCs. The method does not need the prior information, such as noise information, modulation information and a channel coefficient, is very suitable for non-cooperation communication occasions, and is very high in application value. Through the redefining the received signal into two different signal sequences, the method improves the sample utilization rate by one time. Moreover, the algorithm proposed by the invention is better in robustness for frequency deviation and non-Gaussian noise environments. The method can be directly used for a non-cooperation STBC-OFDM communication system, and also can be used for a corresponding software radio system.

Description

technical field [0001] The present invention belongs to non-cooperative communication signal processing technology in the field of signal processing, and specifically refers to a STBC-OFDM (Space-Time Block Codes, STBC and Orthogonal Frequency Division Multiplexing, OFDM) signal based on K-S (Kolmogrov-Smirnov, K-S) detection Blind recognition method. Background technique [0002] In recent years, the automatic identification of communication signals has been extended to the fields of military communication and civilian communication. Examples include spectrum monitoring, electronic warfare, software defined radio, and cognitive radio. The automatic identification of communication signals requires that the signal parameters of the receiving end can be better identified under the condition of low signal-to-noise ratio (Signal Noise Ratio, SNR) without any prior information and front-end processing of the transmitting end. Therefore, the automatic identification of communica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0045H04L1/0057
Inventor 凌青张立民闫文君钟兆根邱立军张磊
Owner NAVAL AVIATION UNIV
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