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Apparatus for enhancing channel evaluation in OFDM receiver and its method

A channel estimation and receiver technology, applied in the field of receivers, can solve problems such as CIR energy leakage, system performance degradation, channel estimation energy leakage, etc., to achieve the effect of reducing energy leakage and improving performance

Active Publication Date: 2010-09-29
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pilot pattern and the frequency-domain interpolation algorithm also have the same problem, that is, since the pilot cannot be transmitted in the virtual subcarrier, the CIR has obvious energy leakage, thereby reducing the performance of the system
[0008] The purpose of the present invention is based on solving the problem of energy leakage in the channel estimation of the prior art

Method used

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  • Apparatus for enhancing channel evaluation in OFDM receiver and its method
  • Apparatus for enhancing channel evaluation in OFDM receiver and its method
  • Apparatus for enhancing channel evaluation in OFDM receiver and its method

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Embodiment Construction

[0031] The present invention will be described in detail below with reference to the accompanying drawings.

[0032] Figure 3a -b shows the baseband functional block diagram of the transmitter and receiver in the MIMO-OFDM system. The content of the present invention mainly relates to the pilot insertion part in the transmitter and the channel estimation part in the receiver.

[0033] The OFDM system is a multi-carrier system. For the convenience of description, we divide the subcarriers in the OFDM system into two types: effective subcarriers and virtual subcarriers. The former is used to transmit data and pilots, and the latter is used as a guard bandwidth without transmission. Use (i.e. transmit 0). According to the relationship with the DC subcarriers, the effective subcarriers can be further divided into positive effective subcarriers, DC subcarriers and negative effective subcarriers.

[0034] Figure 4 Shows the interrelationship of each subcarrier in the OFDM syst...

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Abstract

The invention relates to channel evaluation device and method in OFDM receiver; it aims at overcoming problem of energy leakage for not considering the dummy pilot frequency sub carrier in current scheme. Concretely, in the invention, by the relativity of effective pilot frequency sub carrier and dummy pilot frequency sub carrier, CFR of effective pilot frequency sub carrier and evaluated CFR of dummy pilot frequency sub carrier and CFR of effective pilot frequency sub carrier are used to evaluate the channel, so the energy leakage of the channel evaluation can be decreased greatly, performance of channel evaluation is increased.

Description

technical field [0001] The present invention relates to a single-antenna or multi-antenna OFDM (orthogonal frequency division multiplexing) communication system, in particular to a receiver in the single-antenna or multi-antenna OFDM communication system. Background technique [0002] OFDM technology is a multi-carrier transmission technology. It has high spectral efficiency due to the overlapping and orthogonality of multiple carriers. At the same time, it has a long symbol interval in the time domain and a cyclic prefix inserted in front of each symbol. , so it has a good resistance to the multipath delay of the wireless channel and the pulse interference in the channel. In addition, since OFDM converts the frequency-selective wireless channel into a flat fading channel for each subcarrier, the receiver can use a simple single-tap equalization technique, which significantly reduces the complexity of the receiver. In short, OFDM technology is an effective solution for high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04J11/00H04L25/02H04L27/26
Inventor 李栋郭峰杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD