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Assembly structure of time-domain synchronous orthogonal frequency-division multiplex receiver

A technology of orthogonal frequency division and time domain synchronization, applied in the field of digital information transmission, it can solve the problem of occupying additional spectrum and power resources, and achieve the effect of reducing the complexity of the algorithm

Inactive Publication Date: 2008-02-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both DVB-T and ISDB-T adopt COFDM modulation with a cyclic prefix guard interval. Regardless of whether CP or ZP is used as the guard interval, what it transmits is actually redundant information, which will occupy additional spectrum and power resources.

Method used

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  • Assembly structure of time-domain synchronous orthogonal frequency-division multiplex receiver
  • Assembly structure of time-domain synchronous orthogonal frequency-division multiplex receiver
  • Assembly structure of time-domain synchronous orthogonal frequency-division multiplex receiver

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Embodiment Construction

[0105] The theoretical analysis and specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0106] Figure 10 has shown the baseband block diagram of the TDS-OFDM system realized with DFT. It is assumed that N=3780 subcarriers are included in the OFDM system. Among them, we use 36 subcarriers in the frequency spectrum to transmit TPS, and other subcarriers transmit data. Each subcarrier is represented by a complex symbol X i，k Modulation, where the subscript i is the serial number of the TDS-OFDM signal frame, and k is the serial number of the number of subcarriers. QPSK or QAM modulation can be used on each subcarrier according to the transmission scheme design, X i，k That is, a point on the corresponding constellation diagram. At the transmitting end, we can use IDFT with N=3780 points for modulation.

[0107] make [X 0 , X 1 ,...,X N-1 ] represents a data symbol, since here is the data of a signal...

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Abstract

The invention comprises following structures: digital baseband signal is obtained from analog signal in high frequency after passing through tuner and two times of digital frequency conversion including steps of automatic gain control, frequency evaluation, and time evaluation etc. Then, PN codes are captured. Digital baseband signal is divided into two parts: data and signals of PN codes. After phase correction is carried out for data part, channel equalization is carried out based on channel evaluation obtained from PN codes. The result is sent to forward error correction for decoding. Finally, sending sequence is recovered. The invention makes TDS - OFDM receiver well adapt ideal or non-ideal baseband model. Through theoretical analysis, computer simulation, FPGA prototype, ASIC products in small order etc. main performance reaches or exceeds system requirement and better than other digital TV transmission system.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a time domain synchronous orthogonal frequency division multiplexing (Time Domain Synchronous OFDM, TDS-OFDM) digital television receiver system. Background technique [0002] Television is the most important consumer electronics product for any country in the world today. After experiencing the era of mechanical TV, black and white electronic TV and color TV, TV has now entered a new era: the era of digital TV. Digital TV refers to the use of digital methods to produce, transmit and receive TV programs, enabling viewers to watch images and sounds equivalent to the quality of TV studio programs, without double images and "snowflakes". It is a high-tech product integrating digital signal and information processing technology, digital communication technology, computer and network technology, microelectronics technology and other high-tech deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04J11/00
Inventor 杨知行杨林
Owner TSINGHUA UNIV