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Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine

An inter-carrier interference and self-cancellation technology, applied in multi-carrier systems, modulated carrier systems, effective load distribution, etc., can solve the problems of inability to guarantee communication reliability and low spectral efficiency, and achieve the elimination of inter-carrier interference and high spectral efficiency. Effect

Inactive Publication Date: 2004-07-21
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

In such a wireless application environment, in order to ensure the correctness of communication, the fixed intercarrier interference self-cancellation modulation method with a larger group will inevitably lead to lower spectral efficiency; while the fixed modulation method with higher spectral efficiency cannot guarantee communication reliability
It is impossible for the fixed inter-carrier interference self-cancellation method to optimize the spectrum efficiency under the premise of meeting the given performance requirements

Method used

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  • Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine
  • Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine
  • Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine

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Embodiment Construction

[0029] The present invention will be described in detail below with reference to the accompanying drawings.

[0030] exist figure 2 and image 3 In the preferred embodiment of the present invention shown, the adaptive inter-carrier interference cancellation means involves a transmitter of one communication device and a receiver of another communication device. in:

[0031] A transmitter of a communication device at one end includes a differential phase shift keying (DPSK) modulator and an inter-carrier interference self-cancelling modulator connected to the DPSK modulator, and an adaptive controller associated with the transmitter in operation. The DPSK modulator can also be replaced by other digital modulators, such as a phase shift keying (PSK) modulator, a quadrature amplitude modulation (QAM) modulator, and the like. The other components of the transmitter are the same as those in the prior art, and the illustration is omitted.

[0032] In this embodiment, the working...

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Abstract

The method includes following steps: evaluating maximum frequency shift and signal to noise ratio; selecting modulation state based on selfadapting strategy, and determining demodulation state based on selected modulation state. The devices utilized in the invention includes: the transmitter containing digital modulator, modulator for self-eliminating interference between carrier waves, and adaptive controller; the receiver including digital modulator, modulator for self-eliminating interference between carrier waves, fast Fourier transformer, evaluator, signaling modulator, and demodulation controller. The invention is capable of eliminating interference between carrier waves, making operation state of digital modulator and modulator for self-eliminating interference meet highest frequency spectrum efficiency.

Description

technical field [0001] The present invention relates to an orthogonal frequency division multiplexing system, in particular to an adaptive inter-carrier interference self-cancellation method in the orthogonal frequency division multiplexing system and a transmitter and a receiver implementing the method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a commonly used digital wireless communication system. Due to the existence of inter-carrier interference (ICI), the communication reliability of the system will be reduced. For this reason, various methods have been adopted to eliminate the inter-carrier interference in the OFDM system and improve the communication reliability of the system. Existing methods for eliminating mutual interference between carriers mainly include frequency domain equalization method, time domain windowing method and fixed self-cancelling method of inter-carrier interference. Attac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/04H04L27/26
CPCH04L5/0007H04L27/2647H04L25/03821H04L1/04H04L5/0094H04L5/006H04L5/0046
Inventor 杨红卫黎光洁
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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