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Wireless communication device, wireless communication system, and wireless communication method

A technology of wireless communication equipment and a wireless communication system, which is applied in the field of wireless communication equipment, and can solve problems such as inability to realize synchronization of modulation methods, inability to demodulate data signals, etc.

Inactive Publication Date: 2012-09-12
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when an error occurs in the pilot signal, synchronization of the modulation method cannot be achieved, possibly resulting in failure to demodulate the data signal

Method used

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  • Wireless communication device, wireless communication system, and wireless communication method
  • Wireless communication device, wireless communication system, and wireless communication method
  • Wireless communication device, wireless communication system, and wireless communication method

Examples

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Embodiment Construction

[0035] Exemplary embodiments of the present invention are described next with reference to the accompanying drawings. In the following explanation, constituent elements having the same function are assigned the same reference numerals, and redundant explanation of these elements may be omitted.

[0036] figure 1 is a block diagram showing the configuration of the first exemplary embodiment of the present invention. exist figure 1 In this example, a wireless device 1 includes a transmitting circuit 10 and a receiving circuit 20 . Furthermore, the reception circuit 20 includes a determination unit 20A, a reception unit 20B, and a switching unit 20C.

[0037] The wireless device 1 is a wireless communication device used in a wireless communication system such as a digital microwave wireless communication system, and performs wireless communication with another wireless communication device using an adaptive modulation method in which transmission The state of the line to swit...

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Abstract

Disclosed is a wireless communication device that solves issues involving the transmission capacity of a data signal being reduced more than necessary in order to preserve the reliability of a pilot signal. A determining unit (20A) determines the reception modulation method for a received data signal in response to the state of a transmission line (3). A transmitting circuit (10) generates a first pilot signal indicating the reception modulation method that was determined by the determining unit (20A) and modulates and transmits the first pilot signal after adding an error correcting code thereto. A receiving unit (20B) receives a second pilot signal indicating a transmission modulation method, which is the method for modulating a transmitted data signal. A switching unit (20C) switches to at least either the modulation method for the first pilot signal transmitted by the transmitting circuit (10) or a redundancy of the error correcting code of the first pilot signal, in response to the transmission modulation method indicated by the second pilot signal received by the receiving unit (20B).

Description

technical field [0001] The present invention relates to a wireless communication device that performs wireless communication using an adaptive modulation method. Background technique [0002] With the development of broadband communication technology in wireless communication systems such as digital microwave wireless communication systems, improvements in the transmission capacity (transmission throughput) of data signals are being sought. One technique capable of improving transmission capacity employs multi-value modulation of a data signal to increase the number of bits per symbol of a modulated signal modulated with the data signal, and thereby improve the efficiency of frequency use. A symbol is a unit of a modulated signal that can be transmitted at one time, and the number of bits per symbol of the modulated signal is called a modulation multivalue number. [0003] However, when the modulation is multivalued, the phase and amplitude of each symbol of the modulated s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L1/0004H04L1/0025H04L1/0039H04L1/0072H04L1/0075H04L27/0012
Inventor 市川正树
Owner NEC CORP
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