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Orthogonal frequency dividing multipex receiver and method for treating orthogonal frequency dividing multiplex signal

A receiver and data processing technology, which is applied in the field of OFDM receivers, can solve problems such as buffering and buffering delays that consume calculations

Inactive Publication Date: 2003-12-03
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] As shown in Table 1, using K(≠2 N :3780)-DFT ratio using K'(=2 N :4096)-FFT, which consumes more computation, required buffering and buffering delay

Method used

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  • Orthogonal frequency dividing multipex receiver and method for treating orthogonal frequency dividing multiplex signal
  • Orthogonal frequency dividing multipex receiver and method for treating orthogonal frequency dividing multiplex signal
  • Orthogonal frequency dividing multipex receiver and method for treating orthogonal frequency dividing multiplex signal

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Embodiment Construction

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] image 3 is a preferred embodiment of the present invention, is a use of K'(=2 N )-IFFT replaces figure 1 The traditional K(≠2 N )-DFT block diagram of OFDM receiver. Here, N is a certain positive number and K'(=2 N )>K(≠2 N ), and hereinafter, an example in which K is 3780 and K′ is 4096 will be described. In addition, K and K may satisfy the above condition K'(=2 N )>K(≠2 N ), for example K is 7560, and K' is 8192.

[0029] The OFDM receiver includes an RF unit 100, an ADC (analog-to-digital conversion) unit 200, a GIR (guard interval removal) unit 300, a resampling unit 410, K' (=2 N )—FFT (Fast Fourier Transform) unit 430 , GBR (Guard Band Removal) unit 450 , frequency detection unit 500 , and demapping unit 600 .

[0030]The received carrier signal and a predetermined local oscillation frequency are mixed and down-c...

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Abstract

An OFDM (Orthogonal Frequency Division Multiplexing) transmitter using single OFDM as code element for parallel data processing K(not=2+N) in frequency domain, wherein N is a predetermined positive and K'(=2+N)>K(not=2+N) is disclosed, including: a resampling portion for resampling K(not=2+N) sample data of the time domain as K'(=2+N) sample data; a fast IFFT portion is used for transforming the resampling K'(not=2+N) sample data to K'(=2+N) parallel data; a guard band removal portion removes a guard band from K'(=2+N) parallel data. The guard band is invalid data of K'(=2+N)-K(not=2+N). Thereby, hardware structure and operation of the system are simplified in reason of replacing K(not=2+N)-DFT by K'(=2+N)-FFT. Moreover, a system compates with other device such as DVB-T of 2+N-IFFT can be designed.

Description

technical field [0001] The present invention relates to an Orthogonal Frequency Division Multiplexing receiver, in particular to an OFDM receiver for converting OFDM (Orthogonal Frequency Division Multiplexing) signals from time domain FFT (Fast Fourier Transform) to frequency domain. Background technique [0002] Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) technology is generally widely used in digital transmission technologies such as DAB (Digital Audio Broadcasting), digital TV, WLAN (Wireless Local Area Network) and WATM (Wireless Asynchronous Transfer Mode) . The OFDM method is a multi-carrier technique that modulates data after being divided into several carriers and transmits the modulated data. This OFDM technique is similar to conventional FDM (Frequency Division Multiplexing), but can have optimized transmission efficiency when data is quickly transmitted by transmitting signals maintaining orthogonality characteristics of subcarri...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L27/14
CPCH04L27/2666H04L25/03159H04L25/03019H04L27/2651
Inventor 朴赞燮
Owner SAMSUNG ELECTRONICS CO LTD