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ofdm receiver and its realization method

An implementation method and receiver technology, applied in the field of electronic communication, can solve problems such as bit error and difficulty in effectively suppressing interference, and achieve good transmission performance and good suppression effect

Inactive Publication Date: 2011-12-14
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing OFDM system has a better effect in combating multipath fading, when some sub-channels experience deep fading, it will still cause intolerable bit error results. At this time, some measures need to be taken to reduce the bit error rate and improve the signal quality. In addition, when the interference spectrum overlaps with the useful signal spectrum, it is difficult for the existing processing technology to effectively suppress the interference
Although frequency shift filtering has significantly improved system performance in signal processing, it has not been applied in OFDM at present. Therefore, in order to better utilize the cyclostationarity of OFDM, frequency shift filtering can be considered in OFDM receivers In order to further improve the performance of the receiver

Method used

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Embodiment 1

[0038]The present invention utilizes the cyclostationarity of OFDM signals to propose a method for implementing OFDM receivers combined with frequency shift filtering. This method uses the cyclostationary features introduced by CP in OFDM signals to perform frequency shift filtering preprocessing, and can effectively restore the frequency shift filter. signal, improving receiver performance.

[0039] OFDM receiver implementation method of the present invention comprises the following steps:

[0040] [Step 1] Perform frequency shift filtering on the received signal to suppress additive noise, or suppress additive noise and interference at the same time.

[0041] [Step 2] Process the output of the frequency shift filter; the processing steps include a CP removal step, a DFT transformation step, an equalization step, a demodulation step, a deinterleaving step, and a channel decoding step.

[0042] The present invention discloses an OFDM receiver while disclosing the implementati...

Embodiment 2

[0045] When the frequency shift filter uses the cycle frequency of the useful signal for filtering, it can not only reduce the influence of noise, but also effectively suppress the interference with different cycle frequencies. The effect of this interference suppression occurs simultaneously, and the frequency shift filter The core idea of ​​is the same principle, so the noise model is taken as an example below to illustrate the specific implementation scheme of the present invention. For other applications of the present invention, reference may be made to this embodiment, and those skilled in the art should be able to easily think of other related applications based on this embodiment.

[0046] 【System model】

[0047] see figure 1 , the baseband form of the OFDM transmitted signal s(n) can be expressed as follows:

[0048] s ( n ) = 1 N Σ ...

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Abstract

The present invention discloses an OFDM receiver and its implementation method. The method includes the following steps: performing frequency shift filtering on the received signal, suppressing additive noise, or suppressing additive noise and interference at the same time; performing frequency shift filtering on the output of frequency shift filtering Processing; the processing steps include a CP removal step, a DFT transformation step, an equalization step, a demodulation step, a deinterleaving step, and a channel decoding step. The OFDM receiver proposed by the present invention and its implementation method can be used in systems using OFDM signals, especially have good transmission performance under low signal-to-noise ratio, and have good performance on interference signals with overlapping spectrums but different cycle frequencies. inhibition.

Description

technical field [0001] The invention belongs to the technical field of electronic communication, and relates to an OFDM receiver, in particular to an OFDM receiver combined with frequency filtering; at the same time, the invention also relates to a method for realizing the above-mentioned OFDM receiver. Background technique [0002] With the rapid development of broadband wireless communication technology, Orthogonal Frequency Division Multiplexing (OFDM) transmission system has been widely used because of its high transmission rate, high bandwidth efficiency and high spectral efficiency [Reference 1 ]. OFDM is a multi-carrier modulation technology, which divides the serial data stream into several data streams sent in parallel, and modulates them to the corresponding overlapping and orthogonal sub-carriers respectively, reducing the inter-channel interference (inter-channel interference). , ICI), which improves the spectrum utilization. In the OFDM system, in order to eli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 田金凤郭海友胡宏林杨旸
Owner SHANGHAI RES CENT FOR WIRELESS COMM