Frequency deviation estimating method of receiver based on DTTB (Digital Television Terrestrial Broadcasting) standard

A technology of frequency offset estimation and coarse frequency offset estimation, which is applied to the shaping network, multi-frequency code system, and baseband system components in the transmitter/receiver. Problems such as partial precision estimation, to achieve good system requirements, high precision, and meet the effect of system requirements

Active Publication Date: 2011-01-12
高拓迅达(北京)微电子股份有限公司
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Problems solved by technology

[0019] 3. The data after frequency offset compensation is not used for further precise estimation of frequency offset, which makes the system imperfect and less practical

Method used

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  • Frequency deviation estimating method of receiver based on DTTB (Digital Television Terrestrial Broadcasting) standard
  • Frequency deviation estimating method of receiver based on DTTB (Digital Television Terrestrial Broadcasting) standard
  • Frequency deviation estimating method of receiver based on DTTB (Digital Television Terrestrial Broadcasting) standard

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Embodiment

[0096] Assume that the TDS-OFDM signal data received by the receiving end is r(t), and the frame header mode of the data is the frame header mode 1 specified in the standard. Use a sampling frequency of f for the data s The ADC (analog-to-digital converter) samples it, and the sampling period is The sampled data can be expressed as

[0097] r(n)=r(nT s ) n=1 2...

[0098] If there is a frequency offset f at the receiving end o , then the frequency offset will cause a certain phase offset at each sampling point in is the initial phase of the first sample point, and the phases of each sample point are in a linear relationship. The specific method of this embodiment is described as follows:

[0099] 1. First, perform rough frequency offset estimation:

[0100] 11) Perform autocorrelation processing on the received data r(n). After the first symbol position of the received data, take 165 symbols, multiply and accumulate the 165 symbols delayed by 255 symbols; after th...

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Abstract

The invention relates to a frequency deviation estimating method of a receiver based on a DTTB standard, belonging to the technical field of digital television transmission. The frequency deviation estimating method comprises the following steps of: roughly estimating frequency deviation; carrying out rough frequency deviation compensation on received data according to a rough frequency deviationestimating result; accurately estimating residual frequency deviation; and compensating finally remained residual frequency deviation of the received data according to an accurate frequency deviationestimating result. The invention ensures that the DTTB system can be used for correctly receiving and transmitting signals in large frequency deviation and high-speed movement by using the characteristics of PN (Pseudorandom Noise) sequence circulation of a frame header mode 1 and a frame head mode 3 in a DTTB system.

Description

technical field [0001] The invention belongs to the technical field of digital television transmission, in particular to a receiver frequency offset estimation technology based on DTTB standard. Background technique [0002] Digital TV has been developed since the late 1980s and has been developed for 20 years. Many countries or companies have devoted a lot of energy to formulate digital TV transmission standards and carry out industrialization. Currently, four digital TV terrestrial transmission standards exist: [0003] 1) Trellis-Coded 8-Level Vestigial Side-band (8-VSB) modulation system developed by the American Advanced Television Systems Committee (ATSC). [0004] 2) Coded Orthogonal Frequency Division Multiplexing (Coded Orthogonal Frequency Division Multiplexing, COFDM) modulation system adopted by European Digital Video Terrestrial Broadcasting-Terrestrial (DVB-T) standard. [0005] 3) Bandwidth Segmented Transmission (BST) OFDM modulation system adopted by Integ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26H04L7/033
Inventor 曾朝煌王晓晖张瑞齐
Owner 高拓迅达(北京)微电子股份有限公司
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