Unlock instant, AI-driven research and patent intelligence for your innovation.

Joint estimation method of iq imbalance and channel for mimo-ofdm system

A MIMO-OFDM and joint estimation technology, applied in the field of wireless communication, can solve the problems of destroying the orthogonality between sub-carriers in the OFDM system, channel image interference, and overall performance degradation, and achieve strong practicability, portability, and reliable channels. Responsive, performance-enhancing effects

Active Publication Date: 2018-10-23
SOUTHEAST UNIV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In a wireless communication system, there will inevitably be a phase and amplitude mismatch between the in-phase and quadrature branches at both ends of the transmitter and receiver, that is, IQ imbalance, which will destroy the orthogonality between the subcarriers of the OFDM system Sexuality, image interference to the channel, resulting in a decrease in the overall performance of the system
[0005] At present, there are many mature algorithms for the research on channel estimation and IQ imbalance estimation, but there are relatively few algorithms for IQ imbalance and channel joint estimation, and even fewer algorithms that can be applied to MIMO-OFDM systems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Joint estimation method of iq imbalance and channel for mimo-ofdm system
  • Joint estimation method of iq imbalance and channel for mimo-ofdm system
  • Joint estimation method of iq imbalance and channel for mimo-ofdm system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] figure 1 It is the flow chart of MIMO-OFDM reception. The signal processing process at the receiver mainly includes: timing synchronization, SISO-OFDM channel estimation and equalization, signal field analysis, MIMO frequency estimation and compensation, MIMO-OFDM channel estimation and equalization, and DATA field analysis.

[0043] figure 2It is a schematic diagram of IEEE 802.11ac physical layer frame structure. It consists of a Legacy Preamble, a Very High Throughput Preamble (VHT), and a DATA field. The legacy preamble ensures backward compatibility with 802.11a / n. L-STF is a traditional short training sequence used for automatic gain control (Automatic Gain Control, AGC), timing synchronization and frequency correction. L-LTF is a traditional long training sequence, which is mainly used for more accurate frequency offset esti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention, which belongs to the technical field of wireless communication, relates to an IQ imbalance and channel combined estimation method for an MIMO-OFDM system under the interference of phase and amplitude imbalance of the in-phase and quadrature branch circuits of a receiver. The method comprises: an IQ balance and channel combined response is estimated by using a pilot signal of a DATA domain; with the estimated combined response, an IQ amplitude mismatching factor and a phase mismatching factor are solved; compensation is carried out on the IQ imbalance; and channel estimation is carried out by using a long training sequence after compensation. Therefore, the performance of the MIMO-OFDM system under the IQ imbalance interference can be improved obviously; and the channel response is recovered reliably. Besides, the method has high practicability and transportability.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an IQ imbalance and channel joint estimation method in a MIMO-OFDM system interfered by phase and amplitude imbalance of in-phase and quadrature branches of a receiver. Background technique [0002] How to improve the spectrum utilization efficiency, increase the channel capacity of the communication system, counteract the influence of multipath fading of the wireless channel, and adapt to high-speed data transmission in the broadband wireless environment are the problems that the new generation communication system must solve. OFDM technology has the potential and advantages of high frequency band utilization, strong resistance to frequency selective fading and high transmission rate. The MIMO technology can double the system capacity and greatly improve the performance under the condition of slightly increasing spectrum resources and extra power. Therefore, the co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26H04L27/36
CPCH04L25/024H04L25/0284H04L27/2602H04L27/2655H04L27/2657H04L27/364
Inventor 裴文江刘方王开夏亦犁
Owner SOUTHEAST UNIV