OFDM signal broadcasting system and portable terminal
A portable terminal and signal technology, applied in orthogonal multiplexing systems, multiplexing communication, multi-frequency code systems, etc., can solve the problems of increased system configuration scale, low security and reliability, etc.
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no. 1 example
[0105] FIG. 5 is a block diagram showing the configuration of a digital broadcast receiving apparatus 10A according to the first embodiment of the present transmission.
[0106] Although the transmission mode may vary by region or broadcast station, etc., this embodiment assumes that it is mainly used in a fixed reception environment such as a home when the transmission mode does not change for a short period of time such as one program unit. .
[0107] In FIG. 5 , an antenna 101 supplies a digital broadcast signal to an input terminal of a tuner 102 . This tuner 102 selects a signal of a channel selected by a user from digital broadcasting signals supplied from the antenna 101, converts the frequency of the signal from a radio frequency band to a base frequency band, and supplies an output to an input terminal of an OFDM demodulation section 103. OFDM demodulation section 103 applies processing such as demodulation and error correction to digital broadcasting signals of the ...
no. 3 example
[0135] FIG. 11 is a block diagram showing the configuration of an OFDM signal transmission system according to the third embodiment of the present transmission. In FIG. 11, components assigned the same reference numerals as those in FIG. 5 operate in the same manner as in the first embodiment.
[0136] Although the transmission mode may vary with regions or broadcasting stations, etc., this embodiment assumes that it is mainly used when the transmission mode does not change for a short period of time such as one program unit, such as in the case of the second embodiment In mobile reception environments such as automobiles and cellular phones.
[0137] Furthermore, this embodiment operates in the same manner as the first embodiment except that the current location is recognized using the location registration function in the cell-based mobile communication system.
[0138] The cell-based mobile communication system divides the service area into many small areas called "cells",...
no. 4 example
[0143] FIG. 12 is a block diagram showing the configuration of an OFDM signal transmission system according to the fourth embodiment of the present transmission. In FIG. 12 , components assigned the same reference numerals as those in FIGS. 5 and 11 operate in the same manner as in the first and third embodiments.
[0144] This embodiment assumes that it is mainly used in mobile receiving environments such as automobiles and cellular phones when the transmission mode changes with regions or broadcasting stations, etc., and the transmission mode does not change for a short period of time such as one program unit. middle.
[0145]Furthermore, this embodiment transmits program information including transmission mode information using a channel different from the broadcast channel, and uses this information when selecting a channel.
[0146] In FIG. 12, a program information distribution center 50 acquires / stores program information from a broadcasting station 60 through a commun...
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