Communication apparatus
First Claim
1. A communication apparatus which communicates a signal, comprising:
- a transmission object signal level changing unit which changes a level of a signal which becomes, as to each of plural channels, a transmission object of each channel;
a transmission filter unit which carries out filtering for a signal of each channel, of which a level was changed by the transmission object signal level changing unit, by a filtering characteristic for allowing passage of a frequency component of each channel, as to each of the plural channels;
a transmission signal coupling unit which couples signals of the plural channels, for which filtering was carried out by the transmission filter unit;
an antenna which transmits a signal which was coupled by the transmission signal coupling unit, by wireless;
a coupled signal dividing unit which divides a part of the coupled signal which is outputted from the transmission signal coupling unit to the antenna, into a plurality of signals;
a level detection filter unit which carries out filtering each divided signal which was divided up by the coupled signal dividing unit, by a filtering characteristic which is tuned to an identical frequency to that of the filtering characteristic of the transmission filter unit, as to each of the plural channels;
a signal level detecting unit which detects a level of a signal of each channel, which was obtained by filtering due to the level detection filter unit; and
a transmission object signal level change mode controlling unit which controls a mode of changing a level of a signal which becomes a transmission object of each channel, by the transmission object signal level changing unit, on the basis of a level of a signal of each channel, which was detected by the signal level detecting unit.
1 Assignment
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Accused Products
Abstract
In a communication apparatus, effective automatic power control (APC) is realized, transmission object signal level changing units change a level of a transmission object signal of each channel, and transmission filter units carry out filtering for a signal of each channel after its level was changed with a characteristic for allowing a passage of a frequency component of each channel, and a transmission signal coupling unit couples signals of plural channels after the filtering was carried out, and an antenna transmits a coupled signal by wireless, and coupled signal dividing units divide a part of the coupled signal into a plurality of signals, and level detection filter units carry out filtering for each divided signal with an identical characteristic to the above-described characteristic and signal level detecting units detect a level of a signal of each channel after the filtering was carried out, and a transmission object signal level change mode controlling unit controls a level change mode of a transmission object signal of each channel on the basis of the detection result.
3 Citations
9 Claims
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1. A communication apparatus which communicates a signal, comprising:
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a transmission object signal level changing unit which changes a level of a signal which becomes, as to each of plural channels, a transmission object of each channel; a transmission filter unit which carries out filtering for a signal of each channel, of which a level was changed by the transmission object signal level changing unit, by a filtering characteristic for allowing passage of a frequency component of each channel, as to each of the plural channels; a transmission signal coupling unit which couples signals of the plural channels, for which filtering was carried out by the transmission filter unit; an antenna which transmits a signal which was coupled by the transmission signal coupling unit, by wireless; a coupled signal dividing unit which divides a part of the coupled signal which is outputted from the transmission signal coupling unit to the antenna, into a plurality of signals; a level detection filter unit which carries out filtering each divided signal which was divided up by the coupled signal dividing unit, by a filtering characteristic which is tuned to an identical frequency to that of the filtering characteristic of the transmission filter unit, as to each of the plural channels; a signal level detecting unit which detects a level of a signal of each channel, which was obtained by filtering due to the level detection filter unit; and a transmission object signal level change mode controlling unit which controls a mode of changing a level of a signal which becomes a transmission object of each channel, by the transmission object signal level changing unit, on the basis of a level of a signal of each channel, which was detected by the signal level detecting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication apparatus which communicates a signal, comprising:
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a transmission object signal level changing unit which changes a level of a signal which becomes, as to each of plural channels, a transmission object of each channel; a transmission filter unit which carries out filtering for a signal of each channel, of which a level was changed by the transmission object signal level changing unit, by a filtering characteristic for allowing passage of a frequency component of each channel, as to each of the plural channels; a transmission signal coupling unit which couples signals of the plural channels, for which filtering was carried out by the transmission filter unit; an antenna which transmits a signal which was coupled by the transmission signal coupling unit, by wireless; a pre-level change signal level detecting unit which detects a level of a signal before its level is changed by the transmission object signal level changing unit, as to each of the plural channels; a detection level predetermined value synthesizing unit which synthesizes a level which was detected by the pre-level change signal level detecting unit, as to each of the plural channels, and a predetermined value based on a transmission level which becomes a target and is independent of a modulation system; a coupled signal dividing unit which divides a part of the coupled signal which is outputted from the transmission signal coupling unit to the antenna, into a plurality of signals; a level detection filter unit which carries out filtering each divided signal which was divided up by the coupled signal dividing unit, by a filtering characteristic which is tuned to an identical frequency to that of the filtering characteristic of the transmission filter unit, as to each of the plural channels; a signal level detecting unit which detects a level of a signal of each channel, which was obtained by filtering due to the level detection filter unit by a detection characteristic identical to that of the pre-level change signal level detecting unit; and a transmission object signal level change mode controlling unit which controls a mode of changing a level of a signal which becomes a transmission object, by the transmission object signal level changing unit, on the basis of a difference of a synthesis result by the detection level predetermined value synthesizing unit and a level which was detected by the signal level detecting unit as to each of the plural channels.
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Specification