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OFDM demodulation method

A demodulation method and demodulation technology, applied in the field of OFDM demodulation, can solve problems such as signal enhancement and increase noise intensity, and achieve the effect of reducing complexity

Inactive Publication Date: 2009-12-16
TIMI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, this process introduces additional noise to the demodulation window
If the guard interval sampling signal is not properly processed, the gain from signal enhancement can be offset by the increased noise intensity

Method used

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention is described in detail:

[0022] The signal state information in the conventional OFDM demodulation window includes: the signal state in the conventional OFDM demodulation window includes signal-to-interference and noise ratio (SINR), bit error rate (BER) of decoded signal, time of wireless or wired channel spread. Pilot signal status includes signal-to-interference-noise ratio (SINR), bit-error rate (BER) of the decoded signal, and delay spread of the wireless or wired channel. This method is based on the signal status information or pilot signal status information in the conventional OFDM demodulation window to determine whether to add the signal that falls within the guard interval of the direct path in the demodulation window in the delayed multipath back to the demodulation window for further processing. demodulation.

[0023] figure 1 The OFDM symbol codestream is described. Each symbol cont...

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Abstract

The invention provides an OFDM demodulation method. According to the signal state information or pilot signal state information in the conventional OFDM demodulation window, this method decides whether to add the signal that falls within the guard interval of the direct path in the demodulation window in the delayed multipath back to the demodulation window for decoding. Tune. That is, if the post-processing SINR of the signal in the conventional OFDM demodulation window is higher than a preset threshold or the post-processing BER is lower than a preset threshold, OFDM demodulation will not select the signal sampling in the guard interval: if the conventional OFDM demodulation window If the preprocessing SINR of the signal is less than a preset threshold or the preprocessing BER is greater than a preset threshold, OFDM demodulation will add the signal falling within the guard interval of the direct path in the demodulation window of the delayed multipath back to the demodulation window for demodulation demodulation.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to an OFDM demodulation method. Background technique [0002] The advantages of Orthogonal Frequency Division Multiplexing (OFDM) being suitable for high code rate multi-carrier transmission have been widely demonstrated. In particular, the two major constraints in transmission, ie frequency selective fading channel and intersymbol interference (ISI), are usually solved by using parallel data and guard interval respectively. When OFDM transmits high code rate data in an interference-free parallel narrowband channel, it uses Fourier transform processing to avoid the equalization with very complicated calculations. A guard interval that exceeds the channel delay spread is inserted between OFDM symbols to eliminate ISI. For different applications, the OFDM guard interval appears in the form of "cyclic prefix / suffix" or silent period (zero padding). Most of the current OFDM ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 刘辉邢观斌沈漫源杨庆华宋挥师夏治平胡军李群申红兵
Owner TIMI TECH