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Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system

An integer frequency offset estimation and frequency domain signal technology, which is applied in the field of digital information transmission to achieve the effects of low hardware overhead, strong adaptability and good synchronization performance

Inactive Publication Date: 2013-08-28
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

At present, the pilot signal is automatically tracked first and then narrow-band phase-locked for phase tracking. The frequency recovery is close to ideal, but the cost is to increase the signal power by 0.3dB.

Method used

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  • Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system
  • Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system
  • Integer frequency offset estimation device and method in CMMB (China Mobile Multimedia Broadcasting) system

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Embodiment Construction

[0034] The specific structure of the signal frame in the CMMB standard is as follows figure 1 Shown. The basic unit of the data frame structure in the CMMB standard is a time slot, and the time slot is composed of a beacon and an OFDM symbol. The beacon is composed of the transmitter identification signal and two identical synchronization signals. According to the two different modes of 2M and 8M, the number of subcarriers of the beacon is different; the synchronization signal in the beacon is mainly used for synchronization and is made of linear feedback shift register The generated pseudo-random sequence is generated through OFDM modulation. A slot contains 53 OFDM symbols, and each OFDM symbol is composed of a cyclic prefix (CP) and an OFDM data body. The OFDM data body length is 409.6μs, the cyclic prefix is ​​51.2μs, and the OFDM symbol length is 460.8μs.

[0035] See figure 2 As shown, in an embodiment of the present invention, the integer frequency offset estimation dev...

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Abstract

The invention discloses an integer frequency offset estimation device in a CMMB (China Mobile Multimedia Broadcasting) system. An N-point discrete Fourier transform unit is used for transforming an input synchronous signal into a frequency-domain signal; a read-only memory is used for saving a frequency-domain value of the synchronous signal; a phase rotation device is used for controlling phase transformation through regulating an initial address value during reading the read-only memory; a multiplier is used for multiplying the frequency-domain signal by an output signal of the read-only memory; m time-domain signals are obtained sequentially through m times of N-point discrete Fourier transform on the signal output from the multiplier by the N-point discrete Fourier transform unit; an absolute value taking device is used for respectively taking absolute value signals from the time-domain signals; a maximizing device is used for selecting from the m absolute value signals to obtain the maximum value; and the frequency offset estimation device is used for estimating an integer frequency offset value through obtaining a sequence number of local synchronous signals when the maximumvalue appears. The invention also discloses an integer frequency offset estimation method in the CMMB system. By virtue of the integer frequency offset estimation device in the CMMB system, hardware realization is facilitated, the reliability of a receiving system is ensured, and a better synchronization performance is acquired.

Description

Technical field [0001] The invention relates to the field of digital information transmission, and in particular to an integer frequency offset estimation device in a CMMB (China Mobile Multimedia Broadcasting, China Digital Mobile Multimedia Broadcasting System) system. The invention also relates to an integer frequency offset estimation method in the CMMB system. Background technique [0002] The development of the TV industry and business has always been centered on the improvement of viewing quality and service capabilities. As a new generation of TV technology, mobile digital TV has greatly improved its viewing quality and convenience; at the same time, the adoption of mobile digital technology has become more and more important. Service creates room for development. The development of mobile digital TV will be of great significance to the development of the entire electronic information industry. [0003] The State Administration of Radio, Film and Television of China promu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 张帅刘鹏
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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