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mimo DCO‑OFDM communication method, signal receiving device and system

A communication method and technology at the receiving end, applied in the field of MIMODCO-OFDM communication, can solve problems such as reducing power utilization, and achieve the effects of reducing hardware requirements, reducing adverse effects, and significantly increasing bit error rate performance

Active Publication Date: 2018-01-02
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 reduced power utilization and higher system cost

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  • mimo DCO‑OFDM communication method, signal receiving device and system
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  • mimo DCO‑OFDM communication method, signal receiving device and system

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Embodiment Construction

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

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

[0036] Although clipping is inherently a nonlinear operation, in order to simplify the 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]) to 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 recoveri...

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Abstract

The invention discloses 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. In this method, for the clipping noise generated by the clipping operation at the transmitting end, at the receiving end, firstly, a whitening filter is established according to the linearization model of the clipping operation at the transmitting end and the statistical characteristics of the clipping noise, and the whitening filter is used to The received signals on each subcarrier and the estimated equivalent wireless optical MIMO channel matrix are filtered separately; and then the filtered received signal is restored by using the filtered equivalent wireless optical MIMO channel matrix. The invention also discloses a MIMO DCO-OFDM signal receiving device and a MIMO DCO-OFDM communication system. Compared with the prior art, the present invention can obtain significant bit error rate performance gain and is easy to implement in engineering.

Description

technical field [0001] The invention relates to the technical field of wireless optical communication, and in particular to a MIMO DCO-OFDM (Multiple-InputMultiple-Output Direct-Current-Biased Optical Orthogonal Frequency Division Multiplexing) communication method . Background technique [0002] In recent years, wireless optical communication technology has become a major research focus in the communication academia and industry. This technology can realize lighting and wireless communication functions at the same time, and has the advantages of high transmission data rate, strong confidentiality, no need for spectrum certification, no electromagnetic interference, etc. 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) technology are two core transmission technologies in modern wireless radio communication systems. Among them, the MIMO t...

Claims

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Application Information

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