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OFDM transmitter and OFDM receiver

A transmitter and receiver technology, applied in the fields of OFDM transmitters and OFDM receivers, can solve the problems of large estimation errors, inapplicability, and periodic changes of guard intervals, so as to reduce inter-subcarrier interference and prevent reception characteristics. The effect of deterioration and improvement of calculation accuracy

Inactive Publication Date: 2010-01-13
SHARP KK
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AI Technical Summary

Problems solved by technology

[0016] Therefore, the technology of the above-mentioned Patent Document 1 is not applicable to the format of inserting data symbols in the pilot symbol area, so there is a problem that radio resources cannot be effectively utilized and data transmission efficiency cannot be improved.
[0017] In addition, in an environment with a large transmission delay, the delayed wave enters the depth of the guard interval, so the periodicity of the guard interval may almost disappear.
For this reason, there is a problem that the estimation error in the frequency offset compensation becomes large, etc.

Method used

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  • OFDM transmitter and OFDM receiver
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  • OFDM transmitter and OFDM receiver

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Embodiment Construction

[0073] Hereinafter, embodiments of the OFDM transmitter and OFDM receiver of the present invention will be described with reference to the drawings.

[0074] Figure 1 to Figure 14 It is a diagram showing an example of an embodiment of an OFDM transmitter and an OFDM receiver according to the present invention, and in the drawings, parts assigned the same symbols indicate the same components.

[0075] First, the configuration and schematic operation of the communication system of the OFDM transmitter and OFDM receiver of the present invention will be briefly described below.

[0076] figure 1 It is a system block diagram of the OFDM transmitter and OFDM receiver of the present invention.

[0077] Here, a system combining the OFDM communication scheme and the 4×4 MIMO communication scheme (4×4 MIMO-OFDM communication system) will be described as an example.

[0078] figure 1 The illustrated 4×4 MIMO-OFDM communication system is a system for transmitting and receiving 4-bran...

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Abstract

An OFDM transmitter is provided with a pilot / data arranging section for arranging a pilot / data symbol on an OFDM symbol. An OFDM receiver is provided with an antenna for receiving an OFDM signal transmitted from the antenna of the OFDM transmitter; a wireless section, which performs frequency conversion and the like to the OFDM signal, i.e., the received RF signal, into a base band signal; a frequency offset estimating section for estimating an offset value; and a frequency offset correcting section for performing frequency compensation for the frequency offset. With the OFDM transmitter and the OFDM receiver, data transmission efficiency is improved in environments with much propagation delay, suitable frequency offset correction is performed and receiving characteristics are prevented from deteriorating by reducing data interference between subcarriers.

Description

technical field [0001] The present invention relates to an OFDM transmitter and an OFDM receiver which use pilot symbols arranged in OFDM symbols in a communication system based on OFDM technology or a combination of OFDM technology and communication technology such as MIMO (pilot symbol) estimates the offset of the carrier frequency between transmission and reception. Background technique [0002] In recent years, studies have been actively conducted on mobile communication schemes based on OFDM technology or other communication schemes, such as communication schemes based on communication techniques such as MIMO and CDMA and the OFDM technology. In LTE (Long Term Evolution, Long Term Evolution), which is a next-generation standard studied in 3GPP (The 3rd Generation Partnership Project, 3rd Generation Partnership Project), which standardizes mobile phones, it has been decided to adopt OFDM technology as a downlink communication method. [0003] Especially in OFDM signal m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00H04J99/00
CPCH04L5/0044H04L27/2613H04L27/2657H04L5/0007H04L27/2675H04L5/0048
Inventor 石仓胜利福政英伸龟野俊明小林洋和恒川刚一
Owner SHARP KK
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