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Method for enhancing antijamming capability of multi-carrier communication system of cosine modulated filter bank

A multi-carrier communication and filter bank technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as reducing the performance of FBMC systems, and achieve simple and effective reliable reception , to achieve the effect of recovery

Active Publication Date: 2014-05-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, it also has its own disadvantages. Due to its multi-carrier characteristics, time-domain interference will greatly reduce the performance of FBMC systems

Method used

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  • Method for enhancing antijamming capability of multi-carrier communication system of cosine modulated filter bank
  • Method for enhancing antijamming capability of multi-carrier communication system of cosine modulated filter bank
  • Method for enhancing antijamming capability of multi-carrier communication system of cosine modulated filter bank

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Embodiment Construction

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] The specific implementation steps of the method for the anti-jamming ability of the communication system provided by the present invention are as follows:

[0021] 1) Baseband modulation and serial-to-parallel conversion are first performed on the original signal x signal.

[0022] 2) Perform serial-to-parallel conversion on the baseband modulated signal.

[0023] 3) Randomly insert L zero values ​​into the parallel signal, but the number of zero values ​​is fixed.

[0024] 4) Modulate the type 4 cosine synthesis filter bank on the zero-inserted signal and transmit it through a Gaussian channel.

[0025] 5) Perform fast Fourier transform (FFT) on the received time domain signal y to become a frequency domain signal, the purpose is to perform frequency domain equalization on this signal, eliminate the influence of Gaussian white noi...

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Abstract

The invention discloses a convex optimization technology-based method for enhancing the antijamming capability of a multi-carrier communication system of a cosine modulated filter bank, and belongs to the technical field of wireless communication. The method includes the following steps of: performing base band modulation and R bit string on an original signal at the transmitting end, and transforming to obtain a parallel signal; inserting a zero value into the parallel signal randomly; performing the modulation of the comprehensive cosine modulated filter bank on the signal into which the zero value is inserted, and transmitting the signal through a Gaussian channel; processing the received signal passing through the Gaussian channel by the receiving end, namely performing fast Fourier transform, performing frequency domain equilibrium on the signal, and performing fast Fourier transform on the signal to obtain a time domain signal; making the time domain signal pass through a convex optimization technology-based interference estimation module to obtain a jamming signal contained in the time domain signal, and performing subtraction operation on the time domain signal and the jamming signal to obtain a new signal; and performing operation of demodulation, base band demodulation and the like of a cosine modulated analysis filter bank on the new signal to obtain the originally-transmitted signal. By the convex optimization technology-based method, the reliability of signal transmission can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a method for enhancing the anti-interference ability of a cosine modulation filter bank multi-carrier communication system based on a convex optimization technology. Background technique [0002] The cosine modulated filter bank multi-carrier technology is a multi-carrier multiplexing technology, which belongs to one of the filter bank multi-carrier (FBMC) technologies. Multi-carrier modulation technology is widely used in various communication standards because it can effectively counter the multipath effect in wireless channels. The idea is to use several sub-carriers, and each sub-carrier corresponds to a specific sub-channel, and transmit each sub-data stream in parallel. The existing multi-carrier modulation methods mainly include multi-tone implementation, orthogonal multi-carrier modulation (OFDM) and multi-carrier modulation based on wavelet transform. Tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 王永余梦佳
Owner CHONGQING UNIV OF POSTS & TELECOMM
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