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Communication device, communication system, reception method, and communication method

A communication device and a technology for receiving signals, which are applied in transmission systems, multiplexing communication, digital transmission systems, etc., can solve the problems of signal retransmission times and repeated processing times, and achieve the reduction of repeated processing times and the number of retransmissions. reduced effect

Inactive Publication Date: 2011-01-12
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, in the above-mentioned prior art, the reliability of the received signal improved by retransmitting packets cannot be effectively utilized in repetitive processing using an interference canceller or the like.
Therefore, there is a problem of increasing the number of times of retransmission and the number of repeated processing of the signal transmitted from the first communication device to the second communication device.

Method used

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  • Communication device, communication system, reception method, and communication method
  • Communication device, communication system, reception method, and communication method
  • Communication device, communication system, reception method, and communication method

Examples

Experimental program
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no. 1 Embodiment approach

[0062] In this embodiment, a communication system using Hybrid Automatic Repeat (HARQ) will be described. Also, in this embodiment, in the second communication device that performs repetitive processing using the interference canceller (see figure 2 ) when a retransmission packet is received, the combination is performed in repeated processing, and the reliability of the received signal improved by the retransmission packet is effectively utilized. Thereby, the number of retransmissions and the number of repetitive processes can be reduced.

[0063] figure 1 It is a schematic block diagram showing the configuration of the first communication device 100a according to the first embodiment of the present invention. The first communication device 100a includes an encoding unit 101, an interleaving unit 102, a modulation unit 103, an IFFT unit 104, a transmission signal information multiplexing unit 105, a GI insertion unit 106, a radio transmission unit 107 (also referred to as...

no. 2 Embodiment approach

[0181] In this embodiment, a communication system using Hybrid Automatic Repeat (HARQ) will be described. In addition, in the present embodiment, when the second communication device performing repetitive processing using Turbo equalization receives a retransmission packet, it performs combination during the repetitive processing and effectively utilizes the received signal improved by the retransmission packet. reliability. Thereby, the number of retransmissions and the number of repetitive processes can be reduced.

[0182] The first communication device according to this embodiment can communicate with figure 1 The first communication device 100a shown ( figure 1 ) to achieve the same module structure. The second communication device according to this embodiment and figure 2 Part of the second communication device 200a according to the first embodiment shown is different. Hereinafter, the description will focus on modules having functions different from those describe...

no. 3 Embodiment approach

[0239] In this embodiment, a communication system using Hybrid Automatic Repeat (HARQ) that performs Chase combining will be described. In addition, a case will be described in which, when the second communication device performing repetitive processing using an interference canceller receives a retransmission packet, it combines the FFTed signals of the initial transmission packet and the retransmission packet, and uses Improved reliability of received signal by retransmitting packets. Thereby, the number of retransmissions and the number of repetitive processes can be reduced.

[0240] The first communication device according to this embodiment can communicate with figure 1 It is implemented with the same block structure as the first communication device 100a shown. The second communication device according to this embodiment and figure 2 Part of the second communication device 200a according to the first embodiment shown is different. Hereinafter, the description will ...

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Abstract

A second communication device communicates with a first communication device. The second communication device includes: a reception unit which receives an initial transmission signal and at least one retransmission signal; and a repeated detection decoding unit which performs a repeated process of a signal detection and signal decoding on at least one of the reception signals received by the reception unit. The repeated detection decoding unit includes a synthesis unit which combines a signal detection result obtained from at least one other reception signal once during the repeated process.

Description

technical field [0001] The present invention relates to a communication device, a communication system, a receiving method, and a communication method. [0002] this application claims priority based on Japanese Patent Application No. 2008-040008 for which it applied to Japan on February 21, 2008, and uses the content here. Background technique [0003] The multi-carrier transmission scheme includes OFDM (Orthogonal Frequency Division Multiplexing), OFDMA (Orthogonal Frequency Division Multiple Access), and the like. In the multi-carrier transmission scheme, the influence of multipath interference is reduced by adding a guard interval (Guard Interval, GI) interval to a transmission signal in the first communication device. [0004] In these access methods, when there is an arrival wave exceeding the guard interval, Inter Symbol Interference (ISI: Inter Symbol Interference) and Inter Carrier Interference (ICI: Inter Carrier Interference) will occur. [0005] Inter-symbol in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04B7/04H04J11/00H04L29/08
CPCH04J11/005H04B1/7103H04L1/1819H04L1/1845
Inventor 示泽寿之吉本贵司山田良太野上智造
Owner SHARP KK