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IQ imbalance and channel joint estimation algorithm of OFDM system based on NLS

A joint estimation and balance technology, applied in the field of IQ imbalance and channel joint estimation algorithm of OFDM system based on NLS, can solve the problems of inability to guarantee the phase difference, affecting the system energy, imbalance, etc.

Active Publication Date: 2020-10-16
SOUTHEAST UNIV
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Problems solved by technology

However, due to the non-ideality of its analog devices, the direct conversion transceiver cannot guarantee the 90° phase difference between the in-phase and quadrature branches during up-conversion and down-conversion, that is, IQ (In-phase and Quadrature-phase) imbalance , which seriously affects the system performance

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  • IQ imbalance and channel joint estimation algorithm of OFDM system based on NLS
  • IQ imbalance and channel joint estimation algorithm of OFDM system based on NLS
  • IQ imbalance and channel joint estimation algorithm of OFDM system based on NLS

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Embodiment Construction

[0079] Such as figure 1 As shown, a NLS-based OFDM system IQ imbalance and channel joint estimation algorithm includes the following steps:

[0080] (1) Analyze the IQ imbalance existing in the OFDM transmission system, establish a system model in which both the transmitter and the receiver have IQ imbalance, and the received signal is represented by an extensive linear model in the complex domain;

[0081] (2) All there is the situation of IQ imbalance at the above-mentioned receiving and dispatching end, the analog signal received is sampled at the demodulator, and the discrete-time baseband IQ unbalanced signal received in the system receiver is derived after removing CP;

[0082] (3) In order to reduce the sensitivity of the OFDM transmission system to the influence of physical IQ imbalance, the channel coefficient and IQ imbalance parameters are obtained by using pilot symbols, and the non-convex problem is transformed into a standard linear optimization problem to realiz...

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Abstract

The invention discloses an IQ imbalance and channel joint estimation algorithm of an OFDM system based on NLS. The method comprises the following steps: analyzing the condition of IQ imbalance in an OFDM transmission system, establishing a system model in which IQ imbalance exists at both a sending end and a receiving end, and representing a received signal by a wide linear model in a complex field; for the condition that IQ imbalance exists at the receiving end and the transmitting end, sampling a received analog signal at a demodulator, and exporting a discrete time baseband IQ imbalance signal received in a system receiver after CP is removed; and in order to reduce the sensitivity of an OFDM transmission system to the influence of physical IQ imbalance, obtaining a channel coefficientand an IQ imbalance parameter by using a pilot symbol, converting a non-convex problem into a standard linear optimization problem, and realizing the estimation and compensation of nonlinear least square IQ imbalance. The algorithm has an important practical value for estimation and compensation of I and Q signal imbalance caused by non-ideality of a radio frequency transceiver simulation device in a wireless communication system.

Description

technical field [0001] The invention relates to the field of OFDM system radio frequency transceiver correction technology, in particular to an NLS-based OFDM system IQ imbalance and channel joint estimation algorithm. Background technique [0002] With the rapid development of wireless communication technology, people have increasingly urgent requirements for high-speed and high-quality communication. Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology has been adopted by the 5G standard. OFDM is a kind of multi-carrier modulation (MCM, Multi Carrier Modulation) technology, which can realize high-speed parallel transmission of serial data. The advantages of the OFDM system lie in its good ability to resist frequency selective fading, anti-intersymbol interference (ISI) ability and efficient spectrum utilization, and it has become one of the core technologies in the field of mobile communication. The transmission quality...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2649H04L27/2695H04L27/261
Inventor 夏亦犁李来裴文江
Owner SOUTHEAST UNIV
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