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Method for eliminating interference among carriers based on low-complexity frequency domain linear equalization

A technology of inter-carrier interference and frequency domain linearity, which is applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., and can solve problems such as large time complexity

Inactive Publication Date: 2010-06-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the expression that even if a certain system performance is sacrificed, the required time complexity is still very large

Method used

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  • Method for eliminating interference among carriers based on low-complexity frequency domain linear equalization
  • Method for eliminating interference among carriers based on low-complexity frequency domain linear equalization
  • Method for eliminating interference among carriers based on low-complexity frequency domain linear equalization

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Embodiment

[0049] In this embodiment: the subcarrier number N of the OFDM system is 256; the length M of the cyclic prefix is ​​1 / 16 of the subcarrier number, that is, M=16; the multipath number of the linear time-varying channel is 8 for L; the channel noise is Additive white Gaussian noise (AWGN); the input signal-to-noise ratio (SNR) of the transmitted signal is 0dB-30dB; the test result is the output signal-to-interference-noise ratio (SINR) of the received signal.

[0050] This embodiment includes the following steps:

[0051] Step 1: Extract the time-varying factor from the channel response in the OFDM symbol, and convert the linear time-varying channel h(n,:) into a delay-free time-varying factor β n with another time-varying channel h 1 The product of (n,:) to get the delay-free time-varying factor β n and time-varying channel h 1 The channel response of (n,:).

[0052] The specific steps of the process of extracting time-varying factors are as follows:

[0053] 1) Construct...

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Abstract

The invention discloses a method for eliminating interference among carriers based on low-complexity frequency domain linear equalization and belongs to the technical field of wireless communication. The method comprises the following steps: a linear time-variant channel is equivalent to product of a time-variant factor without delay and another time-variant channel; a cyclic prefix of a time domain receiving signal is removed to obtain a signal sequence; one-dimensional time domain filtering pre-process is carried out on the signal sequence to obtain a time domain initial recovery signal sequence; fast Fourier transform is carried out on the time domain initial recovery signal sequence to obtain a frequency domain initial recovery signal sequence; low-complexity frequency domain linear equalization is carried out on the frequency domain initial recovery signal sequence to obtain a final frequency domain sending signal recovery sequence. Most interference among carriers are eliminated by the one-dimensional time domain filtering pre-process, a banding approximate structure is used to control complex multiplication times required in the inversion process of a channel frequency domain response matrix, thus reducing system complexity greatly in the condition of obtaining high performance, and the method is more suitable for a high-frequency wireless communication system, the hardware of which has low complexity demand.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to a method for eliminating Inter-Carrier Interference (ICI) based on low-complexity frequency-domain linear equalization (Frequency-domain Linear Equalization). Background technique [0002] Radio frequency spectrum is a precious natural resource. In the existing low-frequency wireless communication systems, especially in the hundreds of MHz to 3GHz wireless frequency bands where the frequency requirements are very tight, the competition for the use of spectrum resources is quite fierce. This will become a bottleneck for the popularization and application of broadband wireless communication technology to various fields of national economic development. A feasible solution currently under consideration is to modulate the signal to a higher frequency band with abundant spectrum resources, such as 6GHz-15GHz. However, as the frequency increases, the...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 徐行辉何晨蒋铃鸽
Owner SHANGHAI JIAO TONG UNIV
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