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Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method

A technology of joint channel estimation and balance compensation, applied in the direction of shaping network and baseband system components in transmitter/receiver, which can solve the problem of not obtaining channel state information.

Inactive Publication Date: 2013-09-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This scheme analyzes and estimates IQ imbalance and channel as a whole, and only considers the influence and compensation of IQ imbalance, and does not obtain ideal channel state information

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  • Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method
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  • Channel estimation and IQ (In-phase Quadrature) imbalance united compensation method

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specific Embodiment approach

[0039] The sending and receiving system models of SC-FDE and OFDM systems are as follows: figure 1 shown.

[0040] Γ is N s ×N s The precoding matrix, N s is the length of the symbol block. When the modulation system of the communication system is SC-CP, let Γ=F, F is N s ×N s The FFT transformation matrix, 0≤k,n≤N s -1. When the modulation system of the communication system is OFDM, let ( is N s ×N s the identity matrix). First, the binary bit stream to be sent is channel coded and digitally modulated (which can be BPSK, QPSK, QAM, etc.) to form a continuous symbol stream. Then carry out length N s The symbol of is divided into blocks, and N is added between blocks g guard symbols as guard gaps (N g To be greater than the length of the channel impulse response, it can be N g zeros, or N g cyclic prefix (CP, cyclic prefix)), forming a length of N b (N b =N s +N cp ) frames. The continuous frame stream formed in this way is sent out, passes through the...

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Abstract

The invention belongs to the technical field of wireless communication and particularly relates to a channel estimation and IQ (In-phase Quadrature) imbalance united compensation method in a wireless communication system which is influenced by in-phase orthogonal two-way imbalanced interferences. The channel estimation and IQ imbalance united compensation method comprises the following steps of performing constraint on ranges of IQ imbalanced parameters; constructing objective functions; obtaining coordinate values of an optimal solution; working out an optimal parameter for IQ imbalance; recovering ideal CFR (Channel Frequency Response); and performing compensation on the IQ imbalance and achieving the channel estimation and correction of the IQ imbalance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for joint channel estimation and IQ imbalance compensation in a wireless communication system subject to unbalanced interference of in-phase quadrature (IQ, In-phase Quadrature) two paths. Background technique [0002] At present, many wireless communication standards such as the global standard long-term evolution (LTE, long term evolution), IEEE802.15, IEEE802.16, etc. generally adopt single carrier frequency domain equalization (SC-FDE, single carrier modulation with frequency domain equalization) technology and orthogonal frequency division multiplexing (OFDM, orthogonal frequency division multiplexing) technology. [0003] Wireless communication requires carrier modulation. The two in-phase and quadrature signals of the analog front-end (FE, front-end) will have signal imbalance after modulation or before demodulation (or both), causing sy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 刘静蕾王田成先涛岳光荣李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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