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MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance

A technology of MIMO-OFDM and carrier frequency offset, applied in the field of joint estimation of carrier frequency offset and sampling offset of MIMO-OFDM system under the influence of IQ imbalance, to achieve the effect of high patent value, low complexity and high precision

Inactive Publication Date: 2009-08-05
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a joint estimation method of carrier frequency offset and sampling offset in MIMO-OFDM system under the influence of IQ imbalance, so as to overcome the deficiencies of existing methods

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  • MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance
  • MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance
  • MIMO-OFDM system carrier frequency bias and sampling offset combined estimation method under IQ unbalance

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Embodiment Construction

[0023] In the following description, limited matters such as detailed construction and components are merely helpful for a comprehensive understanding of the present invention. Therefore, the present invention may be practiced without those limited matters. Also, some well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0024] figure 1 is a block diagram showing the OFDM symbol structure. Such as figure 1 As shown, the OFDM symbols designed in the present invention include data symbols and pilot symbols, wherein the pilot symbols are equally spaced and symmetrically distributed around the central subcarrier 0.

[0025] figure 2 is a schematic block diagram showing joint estimation of IQ imbalance estimation and compensation, carrier frequency offset and sampling offset according to the present invention. Such as figure 2 As shown, the receiver of the present invention includes: an OFDM modulat...

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Abstract

The invention discloses a method for jointly estimating carrier wave frequency deviation and sampling deviation of an MIMO-OFDM system under the influence of imbalanced IQ, which is applied to the MIMO-OFDM system which is provided with transmitting antennas with the quantity of Q, receiving antennas with the quantity of P, subcarrier waves with the quantity of N and pilot frequency subcarrier waves with the quantity of M; the method comprises the following steps: at a transmitting terminal, pilot frequency is inserted at a position on the identical subcarrier wave aimed at each transmitting antenna; the pilot frequencies are symmetrically distributed at two sides of a central subcarrier wave; at a receiving terminal, first an IQ imbalance parameter is estimated by utilizing two pilot frequencies in an OFDM symbol and mirror pilot frequencies thereof, the influence on the system of IQ imbalance is compensated, and then the joint estimation of the carrier wave frequency deviation and the sampling deviation is accomplished according to a maximum likelihood estimation principle; and the method for jointly estimating the carrier wave frequency deviation and sampling deviation of the MIMO-OFDM system under the influence of imbalanced IQ makes the most of designed OFDM symbolic structure to accomplish the estimation of the IQ imbalance, carrier wave frequency deviation and sampling deviation, and has the advantages of flexible method, simple realization, and the like.

Description

technical field [0001] The invention relates to a method for jointly estimating carrier frequency offset and sampling offset of a MIMO-OFDM (Multi-Input Multiple-Output; Orthogonal Frequency Division Multiplexing) system under the influence of IQ imbalance. Background technique [0002] OFDM is a multi-carrier modulation technology. It modulates data onto multiple mutually orthogonal subcarriers and sends them simultaneously, turning broadband transmission into narrowband transmission. Therefore, OFDM can effectively resist frequency selective fading. They overlap each other, so its spectrum utilization rate is very high, which is especially important in the wireless environment where spectrum resources are very precious. MIMO technology can significantly increase system capacity without increasing bandwidth, so MIMO-OFDM formed by combining the two is the most promising technology in the new generation (B3G / 4G) mobile communication system. [0003] In order to develop OFDM...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 彭端刘元彭珞丽陈楚
Owner GUANGDONG UNIV OF TECH
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