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Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver

A frequency offset, receiver technology, applied in multiplexing communication, orthogonal multiplexing system, synchronous signal speed/phase control and other directions, can solve the problem that data symbols cannot be fully corrected, wrong bits, etc.

Inactive Publication Date: 2007-10-17
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] Due to the severity of the distortion, the first transmitted data symbols are typically not adequately corrected and result in erroneous bits and erroneous packets

Method used

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  • Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver
  • Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver
  • Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver

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Embodiment Construction

[0018] Illustratively, long preambles are used for residual offset estimation. In this way, even when many long preambles are transmitted (as is the case in the case of MIMO (Multiple Input Multiple Output) systems), since relatively many long preambles are necessary for channel estimation, the residual frequency offset can be zero Data loss is estimated and compensated for.

[0019] The invention is applicable, for example, to communication systems according to WLAN 11n, ie for wireless local area networks, but possibly also to large-area communication systems such as mobile telephone communication systems.

[0020] Embodiments of the invention emerge from the dependent claims. The embodiments described around the method for determining the residual frequency offset apply similarly to the communication system, the method for transmitting a message, the transmitter, the method for processing a message, and the receiver.

[0021] In one embodiment, at least one short preamble...

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Abstract

A method of determining a residual frequency offset between a transmitter and a receiver in a transmission of data via a communication channel, is described, wherein the message is transmitted from the transmitter to the receiver via the communication channel and the message comprises at least one short preamble (201), at least one long preamble (202) and user data (203). The at least one long preamble (202) comprises residual frequency offset determination information based on which the residual frequency offset is determined.

Description

technical field [0001] The invention relates to a method for determining a residual frequency offset, a communication system, a method for transmitting a message, a transmitter, a method for processing a message and a receiver. Background technique [0002] In SISO (Single Input Single Output) OFDM (Orthogonal Frequency Division Multiplexing) systems, i.e. those using modulation of multiple subcarriers according to OFDM for data transmission, with one transmit antenna and one receiver antenna In the communication system of , the preamble is sent before sending the user data for various reasons. First, a short preamble is sent for timing synchronization and frequency synchronization, especially for frequency offset estimation. [0003] Frequency offset estimation is necessary because in real data communications, the local oscillator frequency at the receiver cannot be expected to be the same frequency as the signal carrier generated at the transmitter. One of the reasons fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/04H04J11/00
Inventor 冯灏泓孙素梅何晋强梁应敞吴岩雷中定
Owner AGENCY FOR SCI TECH & RES
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