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Modulation method and system, equipment and storage medium for narrowband data broadcasting

A modulation method and narrow-band data technology, which is applied in the field of communication, can solve problems such as inappropriate transmission of differential data, and achieve the effect of more effective data, pilot pattern and effective subcarrier matrix optimization

Active Publication Date: 2022-02-11
湖南省时空基准科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Although the three technologies of HDradio, CDR, and NBB are parasitic FM broadcasting technologies, HDradio and CDR are not suitable for transmitting differential data.

Method used

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  • Modulation method and system, equipment and storage medium for narrowband data broadcasting
  • Modulation method and system, equipment and storage medium for narrowband data broadcasting
  • Modulation method and system, equipment and storage medium for narrowband data broadcasting

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Embodiment Construction

[0099] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0100] The technical solution of the present application will be described in detail below with specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0101] like figure 2 The block diagram of the NBB system structure is shown. The business data to be transmitted by the upper layer enters the NBB system. In the NBB system, scrambling, channel coding, o...

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Abstract

The invention discloses a modulation method and system for narrowband data broadcasting, comprising modulating a service data bit stream into a group of complex data symbols; determining available effective subcarriers in an OFDM symbol of the service data; determining pilot positions in the effective subcarriers; The pseudo-random sequence generator generates pilot data according to different operating spectrum modes, and modulates it into pilot symbols after mapping; fill the pilot symbols to the pilot positions of valid subcarriers, and fill the remaining valid subcarriers in sequence For complex data symbols, zero complex symbols are filled in virtual subcarriers; IFFT transforms the padded subcarriers to generate time-domain OFDM symbols, and a cyclic prefix is ​​added to the time-domain OFDM symbols to form complete data OFDM symbols. Compared with CDR and HDradio, the pilot pattern and effective sub-carrier matrix adopted by NBB are more optimized. Under the same spectrum resource, NBB transmits more effective data.

Description

technical field [0001] The present invention relates to the communication field, in particular to a modulation method and system, equipment and storage medium for narrowband data broadcasting. Background technique [0002] With the continuous development of global satellite navigation GNSS technology, the satellite navigation standard positioning accuracy of a few meters to more than ten meters can no longer meet the needs of users for high-precision positioning. Differential GNSS technology, which can effectively improve positioning accuracy by using the space and time correlation characteristics of GNSS observation errors, has been widely used. At present, differential GNSS equipment is mainly based on pseudo-range differential GNSS and carrier phase differential GNSS, and its positioning accuracy can reach sub-meter level and centimeter level respectively. With the rapid development of the field of differential satellite navigation and positioning, real-time dynamic carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0008H04L27/261
Inventor 唐焰宫丰奎李果朱钧肖剑熊元希
Owner 湖南省时空基准科技有限公司
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