Vandermonde frequency-division multiplexing method based on multi-carrier modulation technology

A technology of multi-carrier modulation and division multiplexing, which can be used in multi-frequency code systems and other directions, and can solve problems such as complexity and difficulty in practical application.

Inactive Publication Date: 2010-05-05
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this optimal strategy is very complex in

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  • Vandermonde frequency-division multiplexing method based on multi-carrier modulation technology
  • Vandermonde frequency-division multiplexing method based on multi-carrier modulation technology
  • Vandermonde frequency-division multiplexing method based on multi-carrier modulation technology

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Embodiment Construction

[0061] figure 1 shows the 2×2 cognitive radio model under frequency selective fading channel. Among them, s PU 、x PU Denote the input signal and output vector of the primary user transmitter respectively; s SU 、x SU Denote the input signal and output vector of the cognitive user transmitter, respectively. h (11) 、h (12) Denote the channel coefficients between the primary user transmitter and the primary user and cognitive user receiver respectively; h (21) 、h (22) represent the channel coefficients between the cognitive user transmitter and the primary user and the cognitive user receiver respectively, n k ~N c (0, I N ), k=1, 2 is additive Gaussian white noise, y PU 、y SU Denote the primary user and cognitive user receiver signals, respectively.

[0062] figure 2 A block diagram of a Vandermonde frequency division multiplexing system based on multi-carrier modulation proposed by the present invention. On the basis of the existing cognitive radio OFDM modulatio...

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Abstract

The invention discloses a vandermonde frequency-division multiplexing method based on a multi-carrier modulation technology, which is characterized by constructing a vandermonde pre-coder matrix based on a technical model of orthogonal frequency division multiplexing of cognitive wireless network; obtaining system multiplexing gain by using cyclic prefix redundancy and channel frequency selectivity of an orthogonal frequency division multiplexing symbol; eliminating interference of a cognitive user on communication of a main user to obtain an achievable transmission velocity of the cognitive user; and further obtaining full-multiplexing gain of the system by using a frequency domain water-filling power allocation method and different cyclic prefix length values based on the obtained achievable transmission velocity such that the cognitive user can obtain a maximum transmission velocity and share the frequency spectrum with the main user.

Description

technical field [0001] The present invention relates to cognitive radio (Cognitive Radio, CR) technology in wireless communication system, especially a kind of Vandermonde Frequency Division Multiplexing (Vandermonde Frequency Division Multiplexing, VFDM) method based on multi-carrier modulation technology, which belongs to information and communication engineering technology field. Background technique [0002] At present, the continuous growth of various wireless communication service demands leads to the continuous increase of the wireless communication system's demand for spectrum resources, thus making the wireless spectrum resources increasingly scarce. However, spectrum measurement studies show that the utilization rate of licensed spectrum is very low, resulting in serious waste of licensed spectrum holes. The reason is that the static spectrum allocation system does not match the dynamic spectrum utilization mode, resulting in tight wireless spectrum planning and l...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 郑宝玉许晓荣孟庆民王磊
Owner NANJING UNIV OF POSTS & TELECOMM
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