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Bandlimited stochastic sequence generating method and its apparatus

A random sequence and sequence technology, applied in the field of band-limited random sequence generation method and its device, to achieve the effect of sufficient randomness

Inactive Publication Date: 2010-05-12
TIMI TECH
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Problems solved by technology

But in OFDM-based systems, the system sampling rate is often higher than the system bandwidth, for example, the system bandwidth of 10MHz sampling rate is only 8MHz
In this way, the bandwidth of the random sequence generated under the condition of 10MHz sampling rate using the existing technology is at least 10MHz, thereby exceeding the limitation of the system bandwidth of 8MHz

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  • Bandlimited stochastic sequence generating method and its apparatus
  • Bandlimited stochastic sequence generating method and its apparatus
  • Bandlimited stochastic sequence generating method and its apparatus

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Embodiment Construction

[0022] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the band-limited random sequence generation method of the present invention includes three steps of frequency domain sequence generation, frequency-time domain transformation and time domain truncation. Wherein, the frequency domain sequence generation step is used to generate frequency domain complex symbol random sequence:

[0024] X(n)=A(n) m(n), 0≤n≤N-1

[0025] Where N is the sequence length in the frequency domain, m(n) is a complex symbol random sequence generated in a specific way according to the system bandwidth, A(n) is the amplitude gain of the random sequence at each frequency point, according to the power distribution in the band Demand selection. The frequency and time domain converter transforms the random sequence in the frequency domain to the time domain. Fourier transform, Walsh transform...

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Abstract

The invention discloses a random sequence generating method and device, specially a band-limited random sequence generating method and device which can be used in digital broadcasting system based onOFDM. The random sequence generating method is characterized in that it includes: step of generating sequence in frequency domain; step of the sequence in frequency domain is transformed to time domain; step of cutting off the sequence in time domain. The bandwidth of random sequence generated by the method and device is smaller than sampling rate of system, and it can be distributed flexibly based on transmission bandwidth, power of random sequence in every frequency point can be distributed as will with abundant randomicity, it can ensure requirement of system of synchronization capture andfrequency deviation estimating, and can be user widely in broadcasting field of satellite broadcasting, ground wireless broadcasting, cablecasting.

Description

technical field [0001] The present invention relates to a method and device for generating a band-limited random sequence, in particular to a method and device for generating a band-limited random sequence that can be used in OFDM-based digital broadcasting systems. Background technique [0002] In addition to wide coverage and large program capacity, digital broadcasting is characterized by broadcasting, one-to-multipoint, one-to-one, and the cost of broadcasting information has nothing to do with the number of users. Therefore, as an important part of the information communication industry, digital broadcasting plays an important role in the construction of national information infrastructure, the realization of universal service and the national information security strategy. [0003] In a digital broadcasting system, in order to facilitate receivers to realize functions such as synchronous acquisition and initial frequency offset estimation, it is often necessary to add ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 邢观斌葛启宏梁毅斌
Owner TIMI TECH
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