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Transmission device, transmission method, communication system, and communication method

一种发送装置、接收装置的技术，应用在传输系统、数字传输系统、调制载波系统等方向，能够解决传输效率降低、码元间干扰等问题，达到提高抗性的效果

Inactive Publication Date: 2011-12-07
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in Non-Patent Document 1, although the interference between OFDM symbols can be reduced, the transmission efficiency is reduced
[0013] In addition, as described above, in addition to the scattered pilot symbols used for channel estimation, for example, when the signal of an arbitrary subcarrier in the same OFDM symbol is restored with high accuracy, there are also symbols Interference problem

Method used

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  • Transmission device, transmission method, communication system, and communication method
  • Transmission device, transmission method, communication system, and communication method
  • Transmission device, transmission method, communication system, and communication method

Examples

Experimental program
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no. 1 Embodiment approach

[0186] Next, a first embodiment of the present invention will be described. The communication system in the first embodiment includes a transmitting device and a receiving device. figure 1 It is a schematic block diagram showing the configuration of the transmission device in the first embodiment of the present invention. exist figure 1 Among them, the transmission device a1 has an information data symbol generation unit a10 (normal GI symbol generation unit), a pilot symbol processing unit a20 (long GI symbol generation unit), a multiplexing unit a30, and an IFFT (Inverse Fast Fourier Transform: Inverse Fast Fourier Transform) unit a40, GI insertion unit a50, transmission unit a60 (wireless transmission unit), and transmission antenna a100.

[0187] The information data symbol generator a10 arranges (maps) the information data symbol obtained by encoding and modulating the information data signal (transmission data) input from the upper layer processing device of the tran...

no. 2 Embodiment approach

[0278] Next, as a second embodiment of the present invention, a case where generated pilot symbols are stored in advance will be described. The communication system in the second embodiment includes a transmitting device and a receiving device. Figure 16 It is a schematic block diagram showing the configuration of the transmission device in the second embodiment. exist Figure 16 Among them, the transmission device a2 includes an information data symbol generation unit a10, a pilot symbol processing unit a20, a pilot symbol storage unit a70 (symbol storage unit), a multiplexing unit a32, an IFFT unit a40, a GI insertion unit a50, The transmitting unit a60 and the transmitting antenna a100.

[0279] exist Figure 16 In the structure of the sending device a2, with figure 1 The difference of the transmission device a1 in the first embodiment shown is that a pilot symbol storage unit a70 is added after the pilot symbol processing unit a20. In addition, in Figure 16 In the...

no. 3 Embodiment approach

[0291] Next, a case of transmitting control data will be described as a third embodiment of the present invention. The communication system in the third embodiment includes a transmitting device and a receiving device. Figure 17 It is a schematic block diagram showing the configuration of the transmission device in the third embodiment. exist Figure 17 Among them, the transmission device a3 includes an information data symbol generation unit a10, a control symbol processing unit a80, a multiplexing unit a33, an IFFT unit a40, a GI insertion unit a50, a transmission unit a60, and a transmission antenna a100.

[0292] exist Figure 17 In the structure of the sending device a3, with figure 1 The difference of the transmission device a1 in the first embodiment shown is that the pilot symbol processing unit a20 is replaced by the control symbol processing unit a80. In addition, instead of the pilot symbols input to the transmission device a1 in the first embodiment, control ...

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Abstract

In a transmitting apparatus that multicarrier-modulates a symbol, which is a basic unit of a digital signal, and then transmits it, by arranging the subcarriers of the symbol in the first multicarrier symbol having the first guard interval, and The subcarriers in which the symbol is arranged in the second multicarrier symbol of the second guard interval with a long first guard interval are distributed among the plurality of subcarriers constituting the multicarrier at the same time, so that the transmission efficiency of communication can be hardly reduced. Reduced resistance to inter-symbol interference is improved.

Description

technical field [0001] The present invention relates to a transmission device, a transmission method, a communication system, and a communication method. [0002] This application claims priority based on Japanese Patent Application No. 2009-002693 and Japanese Patent Application No. 2009-002694 filed in Japan on January 8, 2009, and the contents thereof are incorporated herein. Background technique [0003] In wireless communication such as mobile communication and fixed communication, due to the influence of reflected waves such as obstacles in the transmission path, the transmitted signal is subject to various disturbances, and the level of the received signal fluctuates, so-called fading, which affects the communication quality. decline. [0004] For example, for Orthogonal Frequency Division Multiplexing (hereinafter referred to as "OFDM (Orthogonal Frequency Division Multiplexing)"), Orthogonal Frequency Division Multiple Access (OFDMA: Orthogonal Frequency Division M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04J99/00
CPCH04L27/2688H04L27/2646H04L27/2607
Inventor 示泽寿之野上智造吉本贵司山田良太加藤胜也
Owner SHARP KK