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Modulation apparatus using mixed-radix fast fourier transform

A Fourier transform and modulation device technology, which is applied in the field of modulation devices based on orthogonal frequency division multiplexing technology or discrete multi-frequency acoustic technology, and can solve the problems of low memory complexity and the like

Inactive Publication Date: 2005-08-31
SAMSUNG ELECTRONICS CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0022] While the conventional architecture introduced by Alcatel achieves sequential processing by utilizing three memories, the conventional sequential processing architecture described above minimizes memory complexity by utilizing only two memories
[0023] However, the conventional sequential processing structure described above is only designed for the case of using the radix-2 algorithm
On the downside, since the continuous processing structure does only base-2 calculations, it requires many calculation cycles and high operating frequency

Method used

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Embodiment Construction

[0047] Several preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions and configurations incorporated herein are omitted for brevity.

[0048] Figure 4 is an example of an FFT processor that performs sequential processing using 2N-word memory by applying an in-place algorithm and simultaneously performing input and output together with a mixed radix structure according to an embodiment of the present invention.

[0049] refer to Figure 4, to perform FFT calculation on the input data, the input / output interface 101 selects one of the memories 102 and 103, selects one of the 4 banks of the selected memory, and writes the input data into the selected bank. When the FFT calculation on the input data is completed, the input / output interface 101 selects a memory in which the FFT calculation data is written, selects one of 4 banks of the selected ...

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Abstract

An FFT (Fast Fourier Transform) processor is disclosed which is a core block of an OFDM (Orthogonal Frequency Division Multiplexing) or DMT (Discrete Multi-tone) MODEM. The FFT processor simultaneously performs sequential input and output by applying an in-place algorithm for a mixed-radix multi-bank memory, thereby realizing continuous processing with only a 2N-word memory having 4 banks. The FFT processor minimizes its complexity while satisfying a high-speed calculation requirement.

Description

technical field [0001] The present invention generally relates to devices for modulating data, and more particularly to modulation devices based on Orthogonal Frequency Division Multiplexing (hereinafter referred to as "OFDM") technology or Discrete Multitone (hereinafter referred to as "DMT") technology. Background technique [0002] Generally speaking, in a digital data communication system, data is modulated before transmission and demodulated after reception. Such modulation and demodulation is performed by a MODEM (modem) which may vary with its modulation scheme. In general, modulation schemes used for data communication include Code Division Multiplexing (CDM), Frequency Division Multiplexing (FDM), OFDM, and DMT schemes. [0003] OFDM and DMT modulation schemes are described below. [0004] The OFDM scheme is proposed for high-speed data transmission on multiple channels in wireless communication systems. Before the OFDM scheme was proposed, a single-carrier trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30G06F17/14H04J11/00H04L27/26
CPCG06F17/142G06F12/0638H04L27/2628
Inventor 鲜于明勋
Owner SAMSUNG ELECTRONICS CO LTD
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