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An ICI Adaptive Suppression Method for Ultra-High Speed ​​Mobile OFDM System

An adaptive, ultra-high-speed technology, applied in baseband systems, transmission systems, multi-frequency code systems, etc., can solve problems such as high computational complexity, achieve low bit error rate, strong interference suppression ability, and good adaptability Effect

Inactive Publication Date: 2018-04-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The well-known algorithms of frequency domain equalization are the zero-forcing algorithm and the minimum mean square error algorithm, but these two algorithms require a matrix inversion process, and the calculation complexity is relatively large. For this reason, continuous interference cancellation technology and parallel interference cancellation technology are introduced.

Method used

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  • An ICI Adaptive Suppression Method for Ultra-High Speed ​​Mobile OFDM System
  • An ICI Adaptive Suppression Method for Ultra-High Speed ​​Mobile OFDM System
  • An ICI Adaptive Suppression Method for Ultra-High Speed ​​Mobile OFDM System

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Experimental program
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Effect test

Embodiment 1

[0030] see figure 1 , the ICI adaptive suppression method of the ultra-high-speed mobile OFDM system, which is used to suppress the ICI in the ultra-high-speed mobile OFDM system, is characterized in that the undisturbed sequence in the CP sequence is used to initially suppress the ICI, and at the same time constitute an ICI reduction The new OFDM symbol sequence, and then through the adaptive PRCC method, further suppress the residual ICI, wherein the process of using the CP to initially suppress the ICI is embedded in the adaptive PRCC process.

Embodiment 2

[0032] This embodiment is basically the same as Embodiment 1, and the special features are as follows: the modulation mapping and demodulation mapping in the step (1) and the step (9) adopt QPSK or 16QAM; the two OFDM symbol sequences in the step (4) Take the alternate splicing method of one OFDM symbol of the first path in front and one OFDM symbol of the second path in the back; the selection of the CP length in the step (5) is determined by the maximum delay extension of the channel, and the CP length is selected is 4 times of the maximum delay extension; the maximum ratio combining method in the step (7) is to implement coefficient weighting processing so that the final output SINR is maximum.

Embodiment 3

[0034] see figure 1 , the OFDM system workflow of the ICI adaptive suppression method of the ultra-high-speed mobile OFDM system is as follows: (1) The information bit stream is subjected to serial-to-parallel S / P conversion and modulation mapping to form an effective OFDM symbols with valid data , yes in the first valid data, where modulation mapping and demodulation mapping use QPSK mapping or 16QAM mapping; (2) data through The time domain signal is obtained after point IFFT processing , that is , then perform parallel-to-serial P / S conversion and insert a cyclic prefix CP before each OFDM symbol, and the CP length is sampling points , at this time the length of an OFDM symbol is given by becomes ; (3) Then for each OFDM symbol sequence It is processed in two ways; the processing process for each OFDM symbol is the same, and only the processing process for one OFDM symbol is described below, where the first way follows the original sequence transm...

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Abstract

The invention discloses a self-adaptive inter-carrier interference (ICI) suppression method of an ultra-high speed moving orthogonal frequency division multiplexing (OFDM) system. In the method, non-interfered sequences in cyclic prefix (CP) sequences are used, so that ICI is preliminarily suppressed; meanwhile, a new OFDM symbol sequence with decreased ICI is constituted, and residual ICI is further suppressed through a self-adaption phase rotation conjugate cancellation (PRCC) method, wherein the process that CPs are used for preliminarily suppressing ICI is nested in the self-adaptive PRCC process. The ICI problem in the ultra-high speed moving OFDM system is solved, and the method has the advantages that interference suppression capacity is high, adaptivity is good and the bit error rate is low.

Description

technical field [0001] The invention relates to a communication signal processing method in wireless communication, in particular to an adaptive suppression method for inter-carrier interference (ICI) of an ultra-high-speed mobile Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] Today, with the continuous evolution of broadband mobile communication systems and in order to meet people's requirements for transmission rates and ultra-high-speed mobility, wireless communication systems will provide higher and higher data rates and more reliable communication quality guarantees. OFDM technology has the advantages of high transmission rate and anti-frequency selective multipath fading, which makes OFDM technology has been recognized as one of the key technologies in the physical layer of broadband mobile communication, and the quasi-4G technology based on long-term evolution (LTE) At present, large-scale construction and commercial use have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L25/03159H04L25/03821H04L27/2647H04L27/2678
Inventor 焦戊臣王军华方勇
Owner SHANGHAI UNIV
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