Search device for solving problem concerning positive or negative frequency spectrum of single carrier

A single-carrier and spectrum technology, which is applied in the field of search devices to solve dtmb single-carrier forward and reverse spectrum, can solve problems such as unobtainable, achieve the effect of reducing the probability of missing stations, reducing the storage of ram, and shortening the search time

Active Publication Date: 2017-05-10
AMOLOGIC (SHANGHAI) CO LTD
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Problems solved by technology

[0004] For a single carrier, the information is reflected in the time domain, and the known PN (Pseudo-random Noise, pseudo-random sequence) and TPS information are equal in the time domain I, Q, and their spectrum is also symmetrical , so that it is impossible to obtain any information about the positive and negative spectrum from the characteristics of the current signal itself, so it can only be searched to obtain

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  • Search device for solving problem concerning positive or negative frequency spectrum of single carrier
  • Search device for solving problem concerning positive or negative frequency spectrum of single carrier
  • Search device for solving problem concerning positive or negative frequency spectrum of single carrier

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0060] In the background technology of the present invention, the search device for solving dtmb single-carrier positive and negative spectrum is as figure 1 Shown: including exchange module, normalization and weight calculation module (calculate x, y, c), log likelihood ratio calculation module, frequency domain deinterleaving module, first selector (mux1), TPS removal module, 4qam -nr decoding module, second selector (mux2), time domain deinterleaving module, buffer module and low density parity check code (ldpc) decoding module.

[0061] First switch the module, according to the external positive and negative spectrum control signal freqRev (this signal is determined by the position of the tps information in the case of multi-carrier; in the case of single carrier, the switching can be contro...

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Abstract

The invention relates to the technical field of DTMB, and especially relates to a search device for solving a problem concerning positive or negative frequency spectrum of a single carrier. After a log likelihood ratio (LLR) calculation model for calculating LLR is moved to a time-domain de-interleaving module, x and y can be exchanged when each frame of low-density parity check code (LDPC) is decoded. Then, LLR is calculated. Finally, the positive or negative frequency spectrum characteristic of the current signal can be determined according to the LDPC decoding result without the need to reset an entire modem system. Thus, the search time is shortened greatly, the time can be shortened by about half compared with common practice, and the probability that a station is missing is reduced. Moreover, based on a floating-point binary quantization method, ram storage can be reduced.

Description

technical field [0001] The invention relates to the technical field of dtmb, in particular to a search device for solving the front and back frequency spectrum of dtmb single carrier. Background technique [0002] For the input signal source of dtmb (Digital Terrestrial Multimedia Broadcast, terrestrial digital broadcasting television), due to the positive and negative spectrum characteristics of signal sources from different manufacturers, it is unknown to the receiving end, so a demodulator (Demod) is required It can realize correct demodulation when the positive and negative spectral characteristics of the signal source are unknown. [0003] Dtmb has two systems, multi-carrier and single-carrier. For multi-carrier, QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation signal) is modulated in the frequency domain, which can be transmitted through frequency domain TPS (frequency domain transmission parameter information) Position to determine whether the cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04N21/438
CPCH04L1/0054H04L1/0061H04L1/0071H04N21/4382
Inventor 刘小同牛进
Owner AMOLOGIC (SHANGHAI) CO LTD
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