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Signal transmission system and signal transmission method with power control

A signal transmission system and signal transmission technology, applied in wireless communication, communication between multiple stations, power management, etc., can solve the problem of insufficiency, local signal of 12 meters or more than 12 meters, and reduce the The effect of an increase in the noise level

Inactive Publication Date: 2006-08-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the WiFi terminal is near the antenna (about 3 meters away from the antenna), the signal transmitted from a distance of 12 meters or more from the antenna cannot meet the required SIR

Method used

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  • Signal transmission system and signal transmission method with power control
  • Signal transmission system and signal transmission method with power control
  • Signal transmission system and signal transmission method with power control

Examples

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no. 1 example

[0070] Figure 9 is a schematic block diagram of a signal transmission system according to an embodiment of the present invention. The signaling system includes Figure 8 The synthesizer / distributor 88 shown in, a plurality of signal processing sections 94-1~N, and Figure 8 A plurality of antennas 84-1˜N shown in , where N is a natural number. Combiner / distributor 88 includes a divider 882 for downlink signals and a combiner 884 for uplink signals. Since each of the signal processing sections 94-1 to N has the same configuration and operates similarly, the first signal processing section 94-1 is described as an example. The signal processing part 94-1 includes a transmission line 942 (such as coaxial cable, optical fiber transmission line, wireless transmission line, etc.) for the downlink signal, an amplifier 944, a bandpass filter 946, a circulator 948, a pass filter 950, an automatic power control amplifier 952, a transmission line 954 for uplink signals (such as coaxi...

no. 2 example

[0088] Fig. 11 is a schematic block diagram of a signal transmission system according to an embodiment of the present invention. In Figure 11, with Figure 9 The same reference numerals are used to identify corresponding features. The signal processing section 94-1 in this embodiment includes the components already described and, in addition, a band-pass filter 970, a power detector 972, a differential amplifier 974 and a control signal generating section 976.

[0089] The bandpass filter 970 filters out unnecessary frequency components from uplink signals in a frequency band (for example, 2400 to 2497 MHz) used by a wireless communication system based on a wireless LAN scheme.

[0090] The power detector 972 detects whether or not a signal component from the wireless communication system of the wireless LAN scheme is contained in the uplink signal, that is, detects whether or not a spurious signal is contained in the uplink signal.

[0091] The differential amplifier 974 fu...

no. 3 example

[0103] Figure 12 and 13 is a functional block diagram showing the signal transmission system in FIG. 11 in more detail. exist Figure 12 In this, a downlink signal transmitted from a wireless base station (Node B) 1202 of a wireless communication system of the W-CDMA scheme is supplied to a bandpass filter 1206 that can pass a W-CDMA frequency band through a circulator 1204, and then the signal is provided to the synthesizer 1208. A downlink signal transmitted from a radio base station 1210 for PHS is supplied to a synthesizer 1208 via a bandpass filter 1212 for PHS and a circulator 1214 . The downlink signal from the WLAN access point (eg, WiFi device) is provided to the combiner 1208 via the WLAN bandpass filter 1218 and a circulator 1220 . The downlink signals of each wireless communication system are combined by a combiner 1208 and then distributed to a plurality of downlink transmission lines by a distributor 1222 . Each transmission line corresponds to a cell and i...

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Abstract

A signal transmission system for transmitting an UP LINK signal received by an antenna shared by at least a first radio communication system and a second radio communication system to at least a radio base station of the first radio communication system is provided. In the signal transmission system, the first radio communication system is affected by a spurious signal of a radio communication system other than the first radio communication system, and the signal transmission system includes: a determination part for determining whether a signal level of a signal, included in the UP LINK signal, from at least the second radio communication system exceeds a permissible level; and a level adjustment part for adjusting a power level of the UP LINK signal so as to output an adjusted signal according to the determination result, and sending the adjusted signal to the radio base station.

Description

technical field [0001] The present invention generally relates to signal transmission systems and signal transmission methods. More particularly, the present invention relates to a signal transmission system and a signal transmission method used in a space where a plurality of wireless systems coexist. Background technique [0002] Due to advances in wireless communication technology in recent years, various wireless communication systems have been proposed, and standardization and commercialization of various wireless communication systems are being achieved. Therefore, there are cases where a plurality of communication systems coexist in the same area. [0003] figure 1 It is a schematic diagram showing a part of a space where a plurality of wireless communication systems exist. figure 1 Represents a plurality of mobile terminals 12-1, 2 and 3; a plurality of antennas 14-1, 2 and 3; a plurality of amplifiers 16-1, 2 and 3; a combiner / distributor 18; and a wireless base ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W52/14H04W52/24
CPCH04W52/146H04W52/24
Inventor 宇多小路明川岛信一小野光洋十和智大场俊直
Owner FUJITSU LTD
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