OFDM system inter-subcarrier interference self-elimination method

An inter-carrier interference and sub-carrier technology, applied in baseband systems, transmission systems, multi-frequency code systems, etc., can solve the problems of deteriorating system performance, raising interference signals, misjudging the activation state of sub-carriers, etc., to improve spectral efficiency, The effect of satisfying business QOS and improving competitiveness

Inactive Publication Date: 2015-04-29
INST OF AUTOMATION CHINESE ACAD OF SCI +1
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Problems solved by technology

[0006] In order to solve the problem that in the case of ICI in the IM-OFDM scheme, the power on the inactive subcarrier is raised by the interference signal, which may easily cause the receiving end to misjudge the activation state of the subcarrier and greatly deteriorate the system performance. The present invention proposes a An OFDM system inter-subcarrier interference self-cancellation method (IM-OFDM with ICI self-cancellation), which combines IM-OFDM and ICI interference self-cancellation schemes, and obtains better error than ICI interference self-cancellation schemes and IM-OFDM schemes. bit rate performance

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[0033] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] refer to figure 1 , which shows a structural block diagram of a transceiver adopting a sequence modulation OFDM inter-subcarrier interference self-elimination scheme of the present invention, specifically including:

[0035] In step 101, all N subcarriers in the OFDM system are divided into G groups, each group includes L pairs of subcarriers, N=2GL. The first pair of subcarriers in group g is denoted as β g，l , g=1, 2,..., N; l=1, 2,..., L, and record the first subcarrier in each pair of subcarriers as The second subcarrier is denoted as So β g , l = { β g , ...

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Abstract

The invention provides an OFDM system inter-subcarrier interference self-elimination method. The method comprises the steps that: 1. all subcarriers in an OFDM system are divided into groups, a certain number of subcarrier pairs are selected from each group and are activated, and information is modulated to the activated subcarriers; 2. ICI interference self-elimination modulation is carried out for each pair of subcarriers in the system; 3. after modulation, all subcarrier pairs are arranged at a transmitting terminal in a distributive mode; 4. the ICI interference self-elimination modulation is carried out for each pair of subcarriers at a receiving terminal; 5. all subcarrier pairs in the system are restored to the original arrangement in a centralized mode; 6. activation state inspection is carried out for each group of subcarriers by means of the maximum likelihood rule and data on the subcarriers are modulated and activated. Based on the OFDM system inter-subcarrier interference self-elimination method, compared with an ICI interference self-elimination scheme and an IM-OFDM scheme, a better ICI suppression effect can be achieved on the condition that the system complexity is not increased.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a new solution for suppressing Intercarrier Interference (ICI) in an Orthogonal Frequency-Division Multiplexing (OFDM) system. Background technique [0002] By allocating data to multiple orthogonal subcarriers, the spectral efficiency of OFDM systems is greatly improved. Compared with traditional modulation schemes, OFDM system has higher frequency offset efficiency, and greatly alleviates the influence caused by intersymbol interference and multipath frequency selective fading. However, the strict subcarrier orthogonality characteristic of OFDM system is extremely sensitive to frequency synchronization deviation and Doppler frequency shift. The inter-carrier interference (ICI) generated by them greatly deteriorates the performance of OFDM systems. [0003] In order to solve the ICI problem of OFDM systems, several representative solutions have been proposed, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L25/03821H04L27/2601
Inventor 李玉珂温淼文程翔杨柳青王飞跃
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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