MIMO DCO-OFDM communication method, signal receiving device and system

A communication method and technology at the receiving end, applied in the field of MIMO DCO-OFDM communication, can solve problems such as reducing power utilization rate

Active Publication Date: 2015-07-01
SOUTHEAST UNIV
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Problems solved by technology

However, the existing MIMO DCO-OFDM communication technology ignores the clipping noise at the transmitting end during the detection process at the receiving end, and improves the performance by using a larger DC bias at the transmitting end, using an amplifier with a wider linear range, and a more powerful light source. Clipping bounds up and down to reduce clipping noise to a negligible effect, but at the expense of lower power utilization and higher system cost

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  • MIMO DCO-OFDM communication method, signal receiving device and system
  • MIMO DCO-OFDM communication method, signal receiving device and system
  • MIMO DCO-OFDM communication method, signal receiving device and system

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Embodiment Construction

[0034] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0035] The idea of ​​the present invention is to eliminate the adverse effects of the clipping noise at the receiving end by using whitening filtering for the clipping noise generated by the clipping operation at the sending end.

[0036] Although clipping is essentially a nonlinear operation, in order to simplify theoretical analysis, a linear approximation model is usually used (see [S.Dimitrov, S.Sinanovic, and H.Haas, "Clipping Noise in OFDM-Based Optical Wireless Communication Systems, "Communications, IEEE Transactions on, vol.60, no.4, pp.1072-1081, Apr.2012]) characterize clipping noise. Under this model, the equivalent received noise of the MIMO DCO-OFDM system will no longer be white noise, that is, the correlation matrix of the noise vector is an off-diagonal matrix. Therefore, the receiver should whiten the noise before recovering the trans...

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Abstract

The invention discloses an MIMO DCO-OFDM (multiple-input multiple-output direct-current-biased optical orthogonal frequency division multiplexing) communication method. The method includes: aiming at clipping noise generated by clipping operation of a sending end, creating a whitening filter at a receiving end according to a linearization model of the clipping operation of the sending end and statistical characteristics of the clipping noise, and utilizing the whitening filter to filter receiving signals on each sub-carrier and an equivalent wireless light MIMO channel matrix acquired by estimation respectively; utilizing the equivalent wireless light MIMO channel matrix after being filtered to restore the receiving signals after being filtered. The invention further discloses an MIMO DCO-OFDM signal receiving device and an MIMO DCO-OFDM communication system. Compared with the prior art, the MIMO DCO-OFDM communication method has the advantages that remarkable bit error rate performance gain can be acquired, and easiness in engineering realization is realized.

Description

technical field [0001] The present invention relates to the technical field of wireless optical communication, in particular to a MIMO DCO-OFDM (Multiple-Input Multiple-Output Direct-Current-Biased Optical Orthogonal Frequency Division Multiplexing, Multiple-Input Multiple-Output DC Biased Optical Orthogonal Frequency Division Multiplexing) communication method. Background technique [0002] In recent years, wireless optical communication technology has become a major research hotspot in communication academia and industry. This technology can realize lighting and wireless communication functions at the same time. It has the advantages of high transmission data rate, strong confidentiality, no need for spectrum certification, and no electromagnetic interference. It is a key technology with great potential in future wireless communication systems. [0003] Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) are two core transmission te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 沈弘邓榆钦赵春明
Owner SOUTHEAST UNIV
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