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A discrete pilot signal generation method for digital audio broadcasting signals and an apparatus

A technology of digital audio broadcasting and discrete pilot frequency, which is applied in the field of signal processing and can solve the problems of poor system signal quality, high requirements, nonlinear distortion, etc.

Active Publication Date: 2014-02-19
TIMI TECH +1
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Problems solved by technology

[0005] Increasing the peak-to-average power ratio of the transmitted signal has higher requirements on power amplifiers, digital-to-analog converters and other devices, resulting in nonlinear distortion, resulting in poor signal quality of the system

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  • A discrete pilot signal generation method for digital audio broadcasting signals and an apparatus
  • A discrete pilot signal generation method for digital audio broadcasting signals and an apparatus
  • A discrete pilot signal generation method for digital audio broadcasting signals and an apparatus

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all embodiments obtained by persons of ordinary skill in the art without any creative work belong to the protection scope of the present invention.

[0039] Scattered pilot signals are an indispensable part of the physical layer frame structure of digital audio broadcasting signals, such as figure 1 As shown, each physical layer signal frame of a digital audio broadcasting signal includes 4 subframes with a length of 160ms, and each subframe includes 1 beacon and S N OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) s...

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Abstract

Proposed are a method and device for generating a discrete pilot signal of a digital audio broadcast signal. The method includes: A, in accordance with a system frame structure, filling a pilot symbol obtained by subjecting a bit stream pair to QPSK constellation mapping to a position of an effective sub-carrier where a discrete pilot element is located according to a predetermined mode; B, subjecting the processing result of step A to IFFT to obtain a time-domain OFDM symbol; and C, multiplexing the time-domain OFDM symbol and a beacon, and obtaining a physical frame signal containing a discrete pilot signal through logical frame framing, subframe allocation and physical layer signal frame generation. The device comprises: a filling module, a transformation module and a framing module. Adopting the method and device, the peak-to-average power ratio of a transmitting signal may not increase, reducing the nonlinear distortion and improving the signal quality.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and device for generating scattered pilot signals of digital audio broadcasting signals. Background technique [0002] In the field of wireless communication, multi-carrier transmission technology has become one of the mainstream solutions. When applying multi-carrier transmission technology, problems such as peak-to-average power ratio and sensitivity to carrier frequency offset need to be faced. If coherent demodulation is used, the receiver also needs to know the real-time response of the fading channel. Time variation and dispersion are the unique properties of wireless channels, and they are also the main content of wireless communication research. [0003] Scattered pilots can not only assist the receiver to achieve coherent demodulation and improve the transmission efficiency of the communication system, but also can be used to track carrier frequency offset and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
CPCH04L27/26H04L27/2601H04L5/0048H04L27/18
Inventor 冯昂雷文李锦文邸娜
Owner TIMI TECH
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