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Self-adaptive modulating and coding method and device based on channel information second order statistics

A technology of adaptive modulation and channel information, applied in the direction of adjusting channel coding, transmission modification based on link quality, selection of devices, etc., to achieve good BER performance

Inactive Publication Date: 2005-01-19
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

The adjustment of the adaptation period T can improve the effectiveness and accuracy of the transformation from SNR to MCS in a given time window, but may require the cooperation of the link adaptation (LA) protocol to signal the update of the adaptation period T

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  • Self-adaptive modulating and coding method and device based on channel information second order statistics
  • Self-adaptive modulating and coding method and device based on channel information second order statistics
  • Self-adaptive modulating and coding method and device based on channel information second order statistics

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and embodiment, the present invention is described in detail:

[0043] see Figure 5 , is a diagram of the judgment criterion of the SNR second-order moment of the adaptive modulation and coding method of the present invention, which not only determines the modulation and coding method (MCS) according to the SNR average value γ, but also according to the SNR variance β. For example, when γ is between γ1 and γ2, the corresponding modulation and coding method M2 is obtained; and then determined according to β, when 0<β<=βk, the corresponding modulation and coding method M2 is used, and when βk<β When <β0, the modulation and coding method M1 lower than the corresponding modulation and coding method M2 is adopted.

[0044] Figure 6 It is a schematic configuration diagram of a base station and a mobile station implementing the adaptive modulation and coding method of the present invention in an OFDM system, wherein the base s...

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Abstract

The invention provides a self-adapting modulating and encoding method and device based on channel second-order statistics in OFDM (orthogonal frequency division multiplex) system, and its characteristic: by character signal-to-noise ratio (SNR) variance, dynamically selecting suitable adapting time window; and using a two-grade moment criterion, i.e. according to SNR average value and variance, selecting suitable modulating and coding style (MCS) to accurately convert SNR to MCS, thus enhancing the applicability of self-adapting modulation and coding and reducing the possibility of system interruption, and therefore, bringing about better error bit rate property.

Description

technical field [0001] The invention relates to a method and device for adaptive modulation and coding in a wireless OFDM (orthogonal frequency division multiplexing) system, in particular to a method and device for adaptive modulation and coding based on second-order statistics of channel signals. Background technique [0002] In an OFDM system, usually the link adaptation technology uses the received symbol signal-to-noise ratio (SNR) as channel quality information (CQI). Therefore, adaptive modulation and coding can be implemented based on different SNR ranges. Within the adaptation time window T of each Adaptive Modulation and Coding Scheme (AMC), the received SNR can lie within a predefined SNR grid (eg figure 1 shown in any of the boxes. γ represents the average value of the SNR of the receiver, and M represents the relevant modulation and coding methods. For example, if the average value of the received SNR γ lies between γ1 and γ2,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/20H04L27/26
CPCH04L1/0019H04L1/0009H04L1/0003H04L1/20H04L27/2608H04L5/0044
Inventor 宋鹏鹏蔡立羽万燕
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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