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Transmission device

A technology of transmitting device and transmitting power, which is applied in space transmit diversity, communication between multiple stations, power management, etc., and can solve problems such as amplifier distortion, increased manufacturing cost, and increased transmit gain

Inactive Publication Date: 2002-08-14
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, since the existing transmitting device uses one transmitting amplifier to multiplex and amplify the transmitting signals of multiple users, the transmitting gain increases when the number of users increases, and a transmitting amplifier with a wide transmitting dynamic range is required.
[0013] However, in conventional transmission amplifiers, if the level of the input signal exceeds a certain value, distortion occurs in the output of the amplifier, and there is a problem that a desired amplification factor cannot be obtained.
This problem can be solved by using a transmission amplifier with a wide transmission dynamic range, but there is a problem of increased manufacturing cost

Method used

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Embodiment 1

[0024] First, a transmission device according to Embodiment 1 of the present invention will be described with reference to FIG. 1 . FIG. 1 is a block diagram showing the configuration of the transmitting device of this embodiment. The transmission system sets the number of transmitted signals (the number of mobile stations communicating) before multiplexing, and sets the number of antennas of the transmitting device after multiplexing. However, in order to simplify the description, in FIG. 1, only the transmission signals are shown before multiplexing. There are two systems of system #1 and transmission system #N, and after multiplexing, only two systems of transmission system #1 and transmission system #M are shown. Since the same processing is performed in each transmission system, the transmission system #1 will be mainly described, and the description of the other transmission systems will be omitted.

[0025] As shown in FIG. 1, the transmitting device of this embodiment...

Embodiment 2

[0054] Embodiment 2 is a modified example of Embodiment 1, and differs from Embodiment 1 in that the multiplexed transmission signal is converted into an optical signal and transmitted through an optical cable.

[0055] Fig. 6 is a block diagram showing the configuration of the transmitting device of this embodiment. In FIG. 6, the same parts as those in FIG. 1 are assigned the same reference numerals as in FIG. 1, and detailed descriptions thereof will be omitted.

[0056] As shown in FIG. 6, in addition to the structure of the transmitting device in Embodiment 1, the transmitting device of this embodiment also includes E / O (electrical / optical) conversion sections 601-1 to 601-M, a wavelength multiplexing section 602, an optical cable 603, the wavelength separation unit 604, and the O / E (optical / electrical) conversion units 604-1 to 604-M.

[0057] The E / O conversion unit 601 - 1 converts the transmission signal from the radio transmission unit 105 - 1 into an optical signal...

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Abstract

Transmit power calculating section 108 calculates transmit power in each of variable amplifiers 103-1 to 103-N based on a transmit power control signal for instructing to increase or decrease the transmit power, and multiplexing allocating section 104 allocates the transmit signal to each of transmission amplifiers 106-1 to 106-M so that the transmit power calculated in transmit power calculating section 108 does not exceed a threshold for which each of transmission amplifiers 106-1 to 106-M is set.

Description

technical field [0001] The present invention relates to a transmission device for controlling transmission power, and more particularly to a transmission device for transmitting a transmission signal through an optical fiber transmission line. Background technique [0002] Transmission power control is a technique for adaptively changing transmission power in a transmitting device so that an optimum reception level can be obtained in a receiving device. In the transmission power control, there are closed-loop transmission power control and open-loop transmission power control. The closed-loop transmission power control is to judge the increase or decrease of the transmission power in the receiving end device, and change the transmission power in the transmitting end device according to the judgment, while the open loop transmission power control In loop transmission power control, the transmission power is judged to increase or decrease in the transmi...

Claims

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Application Information

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IPC IPC(8): H04J14/00H04B1/04H04B7/005H04B10/00H04J14/02
CPCH04W52/42H04B10/25752Y02B60/50H04W52/52
Inventor 平松胜彦加藤修
Owner PANASONIC CORP
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