Transmitting apparatus and transmitting method

A sending device and a technology for sending data, which are applied in phase-modulated carrier systems, digital transmission systems, forward error control, etc., to achieve the effect of preventing throughput reduction and preventing error rate characteristics from deteriorating

Inactive Publication Date: 2006-11-08
OPTIS WIRELESS TECH LLC
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Problems solved by technology

[0006] Meanwhile, although Type III is the same as the above-mentioned Type II, it is a method in which each retransmission packet can be automatically decoded

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  • Transmitting apparatus and transmitting method
  • Transmitting apparatus and transmitting method
  • Transmitting apparatus and transmitting method

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Embodiment approach

[0038] Figure 5 What is shown is a structural block diagram of the communication system 100 involved in the embodiment of the present invention. The transmission device 101 is constituted by an arrangement determination unit 103 , an interleaver 104 , a data replacement unit 105 , a mapping unit 106 , and a modulation unit 107 . Meanwhile, the receiving device 102 is constituted by the configuration determination unit 109 , the demodulation unit 110 , the demapping unit 111 , the data replacement unit 112 , and the deinterleaver 113 .

[0039]Configuration determination unit 103, when performing initial transmission according to the number of transmission times information, decides to perform general constellation mapping predetermined according to different modulation methods, and determines to change the constellation mapping position or change each symbol according to the number of times of retransmission during retransmission bit configuration. Moreover, the configurati...

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Abstract

A transmitting apparatus capable of preventing the error rate characteristic from degrading and of preventing the throughput from degrading due to repetition of retransmittals. In the apparatus, a mapping decision part (103) decides to perform a normal constellation mapping at a first transmission and decides to change the constellation mapping positions or change bit mapping of symbols in accordance with the number of times of retransmittal at a retransmittal. A data interchanging part (105) interchanges the transmitted data for each bit on a symbol-by-symbol basis such that the data are arranged in the bit mapping decided by the mapping decision part (103). A mapper part (106) maps the transmitted data, which are inputted from the data interchanging part (105), onto each symbol such that the data are arranged in the constellation mapping position decided by the mapping decision part (103).

Description

technical field [0001] The present invention relates to a transmitting device and a transmitting method for retransmitting erroneous data. Background technique [0002] In the past, the general technology used in communication systems with low reliability and time-varying line conditions was based on automatic repeat request (ARQ: Automatic Repeat Request) method and error correction decoding (FEC: Forward Error Correction) The error correction performed by the technology is called hybrid ARQ (HARQ). By adopting a general cyclic redundancy check method (CRC:Cyclic Redundancy Check) to detect an error, the receiving unit of the communication system proposes a request for resending the wrongly received data packet to the sending unit (for example, non-patent document 1 and non-patent document 2). [0003] In the ARQ scheme, there are three different types of types I to III. [0004] Type I is a method of discarding a received packet containing an error, retransmitting and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/18H04L1/00H04L1/16H04L1/18
CPCH04L1/0071H04L1/1829H04L1/1893H04L27/3444
Inventor 段劲松山田大辅
Owner OPTIS WIRELESS TECH LLC
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