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Robust channel evaluation for communication system

A communication system and channel estimation technology, applied in the field of training sequence generation and use, can solve problems such as no improvement.

Active Publication Date: 2008-12-17
KEYSIGHT TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in systems with late synchronization errors, all received training sequences include large disturbances, so the weighted average approach does not bring about an improvement

Method used

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  • Robust channel evaluation for communication system
  • Robust channel evaluation for communication system
  • Robust channel evaluation for communication system

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Embodiment Construction

[0031] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. In other instances, well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention.

[0032] It should be noted that in the following description, exemplary embodiments of the present invention are described in the context of an OFDM communication system. However, after fully understanding the spirit of the present invention from the specification, those skilled in the art can appreciate that the present invention can be similarly applied to other systems and modifications can be made without departing from the essence o...

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Abstract

The present invention provides an apparatus and method for realize robust channel estimation in communicating system. A training sequence is configured that training symbols therein are insensitive to synchronization errors. In an embodiment of the invention, each training symbol in the time-domain is the circulating prefix form of a front training symbol. The training sequence can be inserted into the leading field or the loading field of a frame. According to the training sequence generated by a embodiment of the invention, the circulating prefix of a training symbolic is also the circulating postfix of a front training symbolic. The sequence can be used for robust channel estimation in SISO / MIMO communicating system. When the modulating symbols are used to generate training symbols, a same group of training sequence can be used for performing demodulation performance measuring and channel estimation.

Description

technical field [0001] The present invention relates generally to wireless communications, and more particularly to the generation and use of training sequences in channel estimation for communications systems. Background technique [0002] With the rapid development of wireless communication, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) has become a popular method for achieving high-speed data rates with high spectral efficiency because of its efficient use of frequency bands and simple implementation. solution, especially in 4G (fourth generation) wireless communication systems. In an OFDM system, the available bandwidth is divided into several discrete channels, which overlap and are orthogonal to each other. Each discrete channel is defined as a subcarrier and has a well-defined frequency. Each subcarrier carries a modulation symbol whose magnitude and / or phase represents the encoded information. At the receiver, the re...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B7/04
CPCH04L5/0048H04L25/0226H04L27/2613H04L27/2626H04L2025/03426
Inventor 白自权孔红伟张洪刚井雅赵旭沈丹勋
Owner KEYSIGHT TECH
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