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Time domain synchronous orthogonal frequency division multiplex receiving device and equalization method thereof

An orthogonal frequency division and receiving device technology, applied in the field of time-domain synchronous orthogonal frequency division multiplexing receiving devices, can solve problems such as deterioration of equalization functions

Inactive Publication Date: 2005-02-02
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equalization function deteriorates when the information of the channel state is inaccurate due to distortion and noise components

Method used

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  • Time domain synchronous orthogonal frequency division multiplex receiving device and equalization method thereof
  • Time domain synchronous orthogonal frequency division multiplex receiving device and equalization method thereof
  • Time domain synchronous orthogonal frequency division multiplex receiving device and equalization method thereof

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Embodiment Construction

[0029] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0030] figure 2 It is a block diagram of a TDS-OFDM receiving device according to an embodiment of the present invention. refer to figure 2 , The TDS-OFDM receiving device includes: a radio frequency receiving unit (RF RX) 100, an ADC 120, a synchronization unit 140, a demultiplexer 160, a channel state determination unit 200, a first switch 210, a second switch 220, a first FFT unit 310 , the second FFT unit 320 , the time domain equalization unit 400 , the frequency domain equalization unit 500 , and the FEC unit 600 .

[0031] The RF RX 100 down-converts an OFDM broadcast signal received via an antenna to baseband, and the ADC 120 converts an analog signal from the RF RX 100 into a digital signal.

[0032] The synchronization unit 140 performs symbol timing and frequency synchronization using the PN sequence transmitted as synchronization information.

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Abstract

The invention relates to a TDS-OFDM receiving device using different equalizing methods according to channel status and a equalizing method, which comprises: a synchronous unit which is used to enable the OFDM signal according to the receiving of the antenna, transformation to baseband and the analog-digital conversion to be synchronous; a demultiplexer which is used to decompose the OFDM signal received from the synchronous element to a plurality of signals comprising the synchronous information and the OFDM code elements; a time domain equilibrium element which is used to use the OFDM code elements in the synchronous information equilibrium time domain; a first FFT unit which is used to transform the correlation of the synchronous information by the FFT; a second FFT unit which is used to transform the OFDM code elements by the FFT; a frequency domain equilibrium unit which is used to use the correlation of the synchronous information transformed in the first FFT unit to balance the OFDM code elements transformed in the second FFT unit; and a channel state confirmation unit which is used to calculate the correlation of the synchronous information to estimate the channel state, and choose one of the time domain equilibrium unit and the frequency domain equilibrium unit for equilibrium based on the estimated channel state. So the receiving function is improved by choosing one of the time and the frequency domain equilibrium units according to channel state.

Description

technical field [0001] The invention relates to a time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) receiving device using different equalizers according to the channel state. More specifically, the present invention relates to a TDS-OFDM receiving device and an equalizing method thereof that selectively use one of a time-domain equalizer and a frequency-domain equalizer to equalize and improve reception of a TDS-OFDM system according to channel conditions. Background technique [0002] The OFDM scheme converts symbol rows input in serial form into predetermined block-based parallel data, and multiplexes the parallel symbols to different subcarrier frequencies. The OFDM scheme uses multiple carriers, which is quite different from conventional methods using a single carrier. In multi-carrier, the respective carriers are orthogonal to each other. Orthogonality refers to the characteristic that the multiplication of two car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L27/01H04L27/26
CPCH04B7/005
Inventor 金正振郑晋熙
Owner SAMSUNG ELECTRONICS CO LTD
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