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4M transmission method of OFDM structure of satellite CMMB system

A transmission method and system technology, applied in the 4M transmission field of the satellite CMMB system OFDM system, can solve the problems of traditional system transmission rate and spectrum utilization function imbalance, achieve good channel estimation performance, improve system transmission performance, pilot Even pattern distribution effect

Active Publication Date: 2012-04-18
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

The present invention provides a trade-off optimal solution for the CMMB standard in terms of system data transmission rate and spectrum utilization rate, and solves the technical problem of unbalanced functions of traditional systems in terms of transmission rate and spectrum utilization rate

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  • 4M transmission method of OFDM structure of satellite CMMB system
  • 4M transmission method of OFDM structure of satellite CMMB system
  • 4M transmission method of OFDM structure of satellite CMMB system

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Embodiment Construction

[0030] The 4M transmission mode proposed and designed by the present invention adopts a design compatible with the existing 8M / 2M mode in terms of physical layer transmission specifications. The proposed 4M transmission mode can provide one or more independent broadcast channels, which can respectively support multiple coding and modulation methods to meet the signal quality requirements of different services and different transmission environments. The physical layer also supports the mixed mode of multiple services to achieve the matching of service characteristics and transmission modes, so as to realize the flexibility and diversity of business operations. Moreover, in order to maintain the consistency of the three transmission modes, the 4M mode has the same basic structure as the 8M / 2M transmission mode, that is, the equivalent baseband transmission model of the physical layer is basically the same, the difference lies in the design of the main technical parameters of the...

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Abstract

The invention discloses a 4M transmission method of an orthogonal frequency division multiplexing (OFDM) structure of a satellite China mobile multimediabroadcasting (CMMB) system. According to the method, at a transmitting terminal, pilot frequency insertion, OFDM moulding and cyclic prefix insertion are carried out on a data subcarrier that has been coded and mapped and then the processed data subcarrier is sent to a receiving terminal; at the receiving terminal, cyclic prefix deletion, OFDM deframing, and pilot frequency deletion are correspondedly carried out on a received signal and then sent data are recovered by demapping and channel decoding processes. According to the invention, a balanced and eclectic optimized scheme is provided for a CMMB standard in aspects of a system data transmission rate and a frequency spectrum utilization rate, so that a technical problem of unbalanced functions in the aspects of a transmission rate and a frequency utilization rate in a traditional system is solved. Besides, a pilot frequency pattern arrangement mode is designed reasonably and optimized, so that the system has good channel estimation precision and a system transmission performance of a 4M mode in a satellite mobile multipath environment is also improved; moreover, a transmission mode of the OFDM structure of the CMMB system is expanded.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a 4M transmission method of the satellite CMMB system OFDM system. Background technique [0002] In October 2006, the China Mobile Multimedia Broadcasting (CMMB) technical research working group released the industry standard "Mobile Multimedia Broadcasting Part 1: Broadcast Channel Frame Format, Channel Coding and Modulation". (hereinafter referred to as "the standard"). [0003] This standard defines a broadcasting system that transmits multimedia signals such as TV, radio, and data information through the ground (or satellite) in the S-band, in which the physical layer adopts Orthogonal Frequency Division Multiplexing (OFDM) technology, and the signal The bandwidth has two transmission modes of 8M and 2M to choose from. These two modes can provide one or more independent broadcast channels, and support multiple coding and modulation methods to meet the different r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
Inventor 杨童李明峰周傲松
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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