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A FFT realization structure of mb-ofdm UWB system

An MB-OFDMUWB, -4FFT technology is applied in the field of FFT implementation structure at the receiving end of an OFDM system, and can solve the problems of increasing system implementation complexity and power consumption.

Active Publication Date: 2018-11-09
SUN YAT SEN UNIV +1
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  • Claims
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Problems solved by technology

However, when applied to high data rate transmission, it is necessary to increase the processing rate by increasing the system clock frequency, which will greatly increase the implementation complexity and power consumption of the entire system.

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  • A FFT realization structure of mb-ofdm UWB system
  • A FFT realization structure of mb-ofdm UWB system
  • A FFT realization structure of mb-ofdm UWB system

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0033] The overall block diagram of the FFT realization structure of a kind of MB-OFDM UWB system described in the present invention is as follows figure 1 As shown, its structure consists of two modules, the base-8 array module 10 and the two-dimensional base-4 array module 20. The base-8 array module 10 and the two-dimensional base-4 array module belong to a serial relationship in the whole FFT structure, and the output of the base-8 array module 10 is used as the input of the two-dimensional base-4 array module 20; the input of the whole FFT structure is used as the base-4 array module. The input of the 8-array module 10 and the output of the two-dimensional base-4 array module 20 serve as the output of the entire FFT structure. The radix-8 array module 10 implements the first three stages of FFT...

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Abstract

The invention discloses an FFT (Fast Fourier Transformation) implementation structure with a low complexity and a high data processing rate of an MB-OFDM (Multi-Band Orthogonal Frequency-Division Multiplexing) UWB (Ultra Wide Band) system. The FFT implementation structure comprises a radix-8 array module and a two-dimensional radix-4 array module which are connected in series, wherein an output of the radix-8 array module is taken as an input of the two-dimensional radix-4 array module; the radix-8 array module implements first three stages of FFT operations in pipelines; each stage of operation adopts eight parallel pipelines, and is implemented in an eight-path parallel way; and the two-dimensional radix-4 array module implements last four stages of FFT operations of the pipelines, and each stage of operation is also implemented in an eight-path parallel way.

Description

technical field [0001] The present invention relates to an FFT realization structure at the receiving end of an OFDM system, in particular, to a 128-point FFT realization structure for the MB-OFDMUWB system. Background technique [0002] Ultra-wideband (UWB) technology is a wireless communication technology with large bandwidth capacity and low transmission power. It is especially suitable for data transmission between high speed, low power consumption and short distance, and has broad application prospects. UWB was the first to use carrier-free pulses to realize data transmission. At present, there are mainly two implementation schemes: DS-UWB scheme based on Direct Sequence (Direct Sequence) spread spectrum technology and Code Division Multiple Access (CDMA) technology and OFDM technology-based MB-OFDM scheme. Compared with the DS-UWB scheme, the MB-OFDM scheme has the advantages of better anti-multipath performance and simpler receiver structure during high-speed transmi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/265
Inventor 尹秀文谭洪舟路崇李宇陈荣军叶威朱波
Owner SUN YAT SEN UNIV