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Apparatus for and method of compensation for frequency offset and channel variation in mimo-ofdm receiver

A technology of frequency offset and channel change, used in channel estimation, multi-frequency code system, modulated carrier system, etc.

Inactive Publication Date: 2006-08-30
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

However, it is difficult to apply traditional OFDM receivers to MIMO communication systems because they only consider the frequency offset between a single transmitter and a single receiver

Method used

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  • Apparatus for and method of compensation for frequency offset and channel variation in mimo-ofdm receiver
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  • Apparatus for and method of compensation for frequency offset and channel variation in mimo-ofdm receiver

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Embodiment Construction

[0035] The present invention will now be fully described with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

[0036] figure 2 is a block diagram of a MIMO-OFDM receiver with an apparatus for compensating for frequency offset and channel variation according to an exemplary embodiment of the present invention. The OFDM receiver includes 3 receiving ends. refer to figure 2 , the OFDM receiver includes: first to third antennas 201_1 to 201_3, first to third RF downconverters 202_1 to 202_3, first to third LOs 203_1 to 203_3, first to third ADCs 204_1 to 204_3 , frequency offset compensation unit 210, first to third Fast Fourier Transformers (FFT) 220_1 to 220_3, residual frequency offset and channel variation compensation unit 230, first to second demappers 240_1 to 240_2 and FEC decoder 250.

[0037] According to an exemplary embodiment of the present invention, the frequency offset compensation unit 210 is referred to as...

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Abstract

An apparatus for compensating for a frequency offset and a channel variation, includes: a frequency offset compensation unit estimating the frequency offset of receptions signals received via reception ends based on a final metric value of the reception signals, and a compensator compensating for the frequency offset of the receptions signals based on the estimated frequency offset; Fast Fourier Transformers (FFTs) converting reception signals having the compensated frequency offset into frequency domain reception signals; and a frequency offset and channel variation compensation unit estimating channel coefficients of signals output from the FFTs by sub carriers, compensating for a residual frequency offset and a channel variation of the reception signals from the FFTs based on pilot signals and the estimated channel coefficients, and detecting signals transmitted from transmission ends based on the reception signals having the compensated residual frequency offset and channel variation and the estimated channel coefficients.

Description

[0001] This application claims priority from Korean Patent Application No. 10-2005-0016264 filed with the Korean Intellectual Property Office on February 26, 2005, which is hereby incorporated by reference in its entirety. technical field [0002] Apparatuses and methods consistent with the present invention relate to compensating for frequency offset and channel variation, and more particularly, to compensating for frequency offset and channel variation in Multiple Input Multiple Output (MIMO)-Orthogonal Frequency Division Multiplexing (OFDM) receivers Variety. Background technique [0003] Typically, OFDM receivers are used at the physical layer of a wireless local area network (LAN). The frequency of the OFDM receiver is not synchronized with the frequency of the transmitter due to distortion of the received signal caused by multipath fading and the difference between their respective local oscillator frequencies. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L1/06
CPCH04L1/0631H04L27/261H04L25/0206H04L27/2659H04L27/266H04L1/0656H04L27/2695H04L27/2675H04L25/0204H04L25/0224
Inventor 金载和金兑坤郑在祜
Owner SAMSUNG ELECTRONICS CO LTD
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