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Method for implementing rapid channel estimation using FWT in DMB-T system

A channel estimation and DMB-T technology, applied in multi-frequency code systems, baseband system components, etc., can solve the problems of large amount of search calculations and high complexity of hardware implementation

Active Publication Date: 2008-12-24
麦克盛科技(香港)有限公司
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Problems solved by technology

The implementation of the sliding window correlator is relatively simple, but the search calculation is large. When the PN sequence code length is N, its complexity is N 2 Addition and subtraction operations, relatively speaking, the complexity of hardware implementation is very high

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  • Method for implementing rapid channel estimation using FWT in DMB-T system
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  • Method for implementing rapid channel estimation using FWT in DMB-T system

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Embodiment Construction

[0014] The DMB-T system uses a multi-frame structure to transmit signals, and its basic unit is a signal frame. A signal frame consists of a frame header (cyclically extended PN sequence) and a frame body (3780 data blocks). There are two types of frame header signals: fixed mode and variable mode, and the same 4QAM modulation of I and Q channels is adopted. In the change mode, within the duration range of the super frame, the frame header contains the encoded unique frame address to realize the identification of multiple program streams.

[0015] In order to adapt to different applications, three frame header modes are defined, namely PN420, PN595, and PN945. Among them, PN420 and PN945 are used in multi-carrier mode, and the transmission power is doubled compared with the frame body signal power, which helps to improve the reliability of channel estimation. Their frame header structures are similar, and they are all composed of a preamble, a PN sequence with a code length ...

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Abstract

The invention discloses a method for realizing fast channel estimation in a DMB-T system by using an FWT, which realizes multipath acquisition by using the FWT. The steps for related to the matching of a PN sequence are as follows: a cyclic convolution with length of N receives signal vector sequence r, and the signal vector sequence r is transformed into time-domain channel impulse response h; the strong number S and the corresponding impulse response hsi are obtained. The interference cancellation steps are as follows: as for all strong impulse response complex gains, the interference is entirely cancelled through all strong interference components hsi, and a real channel impulse response sequence h and the channel transmission function H (omega) are obtained. The method has the advantages that the computational complexity can be effectively reduced, the hardware realization is simple, and the method is suitable for matching related system by using by using the periodic PN sequence, for example, the receiving system of DMB-T digital terrestrial broadcasting.

Description

technical field [0001] The invention belongs to the field of wireless signal transmission, in particular to a method for realizing fast channel estimation by using FWT (fast Walsh transform) in a DMB-T system, which is mainly applied in a receiving system of DMB-T digital terrestrial broadcasting. Background technique [0002] Terrestrial digital broadcasting has always been a hot spot in the wireless field in recent years. On August 1, 2006, my country launched a mandatory standard for digital TV terrestrial broadcasting transmission system - the national standard DMB-T, and determined a transition period of one year. The national standard uses PN sequence time domain filling to replace the time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) technology of the guard interval in the usual OFDM (orthogonal frequency division multiplexing) system, which has strong anti-multipath interference ability. In the DMB-T system, the PN sequence filled in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 蒋朱成吴涛
Owner 麦克盛科技(香港)有限公司
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