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A carrier frequency offset estimation method suitable for mimo-ofdm system

A MIMO-OFDM, carrier frequency offset technology, applied in the field of wireless communication, can solve the problem that the accuracy of frequency offset estimation needs to be improved, and achieve the effects of strong practicability and portability, improved performance, and improved accuracy

Active Publication Date: 2019-02-05
SOUTHEAST UNIV
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Problems solved by technology

The traditional frequency offset estimation algorithm uses the L-STF and L-LTF fields, which are mainly used in SISO systems, and the frequency offset estimation accuracy needs to be improved in MIMO systems

Method used

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  • A carrier frequency offset estimation method suitable for mimo-ofdm system
  • A carrier frequency offset estimation method suitable for mimo-ofdm system
  • A carrier frequency offset estimation method suitable for mimo-ofdm system

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[0047] specific implementation plan

[0048] The technical solution of the present invention will be analyzed and explained in detail below in conjunction with specific implementation examples. It should be understood that the implementation examples given here are not limited to the IEEE 802.11ac system targeted by the present invention. After reading the present invention, those skilled in the art can make various equivalents to the present invention within the scope of the appended claims of the present application Promotional Modifications of the Form.

[0049] The example of the present invention provides a carrier frequency offset estimation scheme of MIMO-OFDM system, which realizes estimation and compensation of coarse frequency offset and fine frequency offset respectively through L-STF and L-LTF sequences of received signals. In order to better illustrate the technical content of the present invention, specific embodiments are given in conjunction with accompanying ...

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Abstract

The invention provides a carrier frequency offset estimation method suitable for an MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system. Coarse frequency offset estimation and compensation as well as fine frequency offset estimation and compensation are finished respectively through a received short training sequence and a received long training sequence. Compared with a conventional scheme, the method has the advantages that the influence of noise is smoothened through more data relevant information. Through the provided carrier frequency offset estimation scheme, frequency selectivity of a channel is allowed; the accuracy of MIMO system carrier frequency offset estimation is increased; and the performance of a receiver is improved. Moreover, the method is suitable for various wireless local area network receiving systems, has relatively high practicability and portability.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for estimating carrier frequency offset in MIMO-OFDM receiver baseband signal processing, in particular to a scheme for estimating coarse frequency offset and fine frequency offset using a preamble sequence. Background technique [0002] In 2013, the IEEE organization officially released the new generation wireless LAN communication standard IEEE 802.11ac, which supports up to 160MHz bandwidth, 8 spatial code streams and 256-QAM high-density modulation, bringing users high-speed data transmission . However, these technologies also make IEEE 802.11ac-based products have high requirements for RF conformance test systems. At present, the RF receiver baseband signal processing technology for IEEE 802.11ac system has become the focus of research. [0003] The IEEE 802.11ac physical layer adopts MIMO-OFDM technology. The OFDM system adopts multi-carrier digital...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2656H04L27/2659H04L27/266H04L27/2662
Inventor 裴文江张田静王开夏亦犁
Owner SOUTHEAST UNIV
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