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A Transmitter IQ Imbalance Compensation Method Based on Joint Channel Estimation

A technology for joint channel estimation and balance compensation, applied in the direction of shaping network, digital transmission system, baseband system components in transmitter/receiver, etc., can solve the problem of ineffective compensation, dependence, and applicability of frequency-dependent IQ imbalance. Limits and other issues to avoid high-complexity calculations and reduce overhead

Inactive Publication Date: 2019-03-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used non-blind estimation algorithms face problems such as dependence on ideal channel estimation, specific requirements for training sequences, limited applicability, inability to separate IQ imbalance parameters from channels, or inability to effectively compensate for frequency-dependent IQ imbalance.

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  • A Transmitter IQ Imbalance Compensation Method Based on Joint Channel Estimation
  • A Transmitter IQ Imbalance Compensation Method Based on Joint Channel Estimation
  • A Transmitter IQ Imbalance Compensation Method Based on Joint Channel Estimation

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Embodiment Construction

[0026] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0027] Assume that the original data stream is u[n] (n=1,2,...) After serial-to-parallel conversion, a symbol block of length N is obtained u=[u[nN],u[nN+1],...,u [(n+1)N-1]] T . insert length N before u cp The cyclic prefix (CP,CyclicPrefix) forms a length N s A new sequence of: Among them, N s ×N matrix To add CP matrix, N s =N+N cp ;0 m×n Represents an m×n matrix of zeros. After parallel-to-serial conversion, becomes a scalar sequence x[n], Among them, n=kN s +l-1. The introduction of the cyclic prefix transforms the linear convolution into a circular convolution.

[0028] figure 2 is the IQ unbalanced structural diagram of the transmitting end of the present invention, assuming that the ideal complex baseband signal that the transmitting end needs to transmit is x(t)=x I (t)+jx Q (t), where

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Abstract

The invention belongs to the technical field of wireless communication, and in particular relates to a method for compensating IQ imbalance at a transmitting end of a single carrier frequency domain equalization (single carrier-frequency-domain equalization, SC-FDE) system in a wireless communication system. The present invention simultaneously obtains the separated IQ imbalance parameters and estimated channel, uses the estimated IQ imbalance parameters as fixed parameters to perform unified compensation, and does not need to perform repeated parameter estimation on the IQ imbalance parameters, compared with the previous IQ imbalance parameters Most of the balance compensation methods consider the IQ imbalance and the channel as a whole, which reduces the overhead of system calculation. At the same time, the overall algorithm of the present invention mainly involves linear operations, avoiding high-complexity calculations.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a compensation method for IQ imbalance at a transmitting end of a single carrier-frequency-domain equalization (SC-FDE) system in a wireless communication system. Background technique [0002] Wireless communication usually requires carrier modulation. In practice, the non-ideality of analog devices makes the in-phase and quadrature (In-phase Quadrature, IQ) signals of the analog front-end (FE) in the process of modulation and demodulation. The amplitude of the vibration signal is no longer the same, and the phase difference is not equal to the exact (IQ unbalanced), so image interference occurs and the system performance decreases, which is more serious in systems with higher carrier frequencies (such as millimeter wave communication systems). Especially when the high-frequency communication system adopts high-order modulation or the RF front-end adopt...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/36
CPCH04L25/03878H04L27/361
Inventor 娄念念成先涛罗曾强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA