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

A technology of communication device and communication system, which is applied in transmission system, digital transmission system, multiplexing communication, etc., and can solve the problems of increasing the number of repeated retransmissions and increasing delay

Inactive Publication Date: 2011-06-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem of increasing the number of repeated retransmissions, resulting in an increase in delay, as in the case of requesting retransmission in response to an error detected in the decoding processing result of the composite signal of the received signal and the already received signal.

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

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no. 1 Embodiment approach

[0057] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In this embodiment, a packet transmission device 100 (first communication device) and a packet reception device 200 (second communication device) are provided, and MC-CDM (Multi Carrier-Code Division Multiplexing: multi-carrier code division multiplexing) is applied. In a hybrid automatic repeat transmission (HARQ) packet communication system (communication system) that requests retransmission from a transmission source when an error is detected in a received signal, the packet transmission device 100 (first communication device) transmits a pair of initial transmission packets and A signal obtained by code-multiplexing a retransmission packet related to an arbitrary initial transmission packet preceding the initial transmission packet is provided with a packet receiving apparatus 200 (sequence number 200) including a successive interference canceller (SIC: Successi...

no. 2 Embodiment approach

[0143] In the first embodiment, the case where the initial transmission packet and the retransmission packet of the hybrid automatic repeat transmission HARQ are code-multiplexed by the spreading code, and the inter-code channel interference (MCI) is removed by the repetition successive canceller (SIC) is carried out. explained. In the second embodiment, a communication system including the packet transmission device 300 and the packet reception device 400 will be described. In this communication system, the data transmitted to the packet transmission device 300 using MIMO (Multi Input Multi Output) will be described. The initial transmission packet and the retransmission packet are spatially multiplexed, and the packet receiving apparatus 400 removes signals of other streams by a repeat-sequential canceller (SIC). In this embodiment, a case where the OFDM method (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) is applied as a packet tra...

no. 3 Embodiment approach

[0211]In the third embodiment, it is applied to the case where the initial transmission packet and the retransmission packet of hybrid automatic repeat transmission HARQ are code-multiplexed by the spreading code, and the inter-code channel interference (MCI) is removed by the repetition-successive canceller SIC. A communication system according to the present invention will be described. This communication system includes a packet transmission device 500 and a packet reception device 600 different from those of the first embodiment. In addition, the spreading code sequence of this embodiment is an Orthogonal Variable Spreading Factor (OVSF) code.

[0212] Figure 17 It is a schematic block diagram showing the configuration of the packet transmission device 500 according to this embodiment. The packet transmission device 500 includes code channel signal generation units 501-1 to 501-N, code multiplexing unit 102, IFFT unit 103, multiplexing unit 104, GI insertion unit 105, tr...

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Abstract

A communication device includes: a reception unit which receives a signal containing a initially transmitted signal and a retransmission signal of any one signal; a detection order decision unit which decides the order of detection of the initially transmitted signal and the retransmission signal from the signal received by the reception unit in accordance with the number of retransmissions of the initially transmitted signal and the retransmission signal; and a signal detection unit which detects the initially transmitted signal and the retransmission signal from the signal received by the reception unit according to the order decided by the detection order decision unit, by using a detected signal relating to the initially transmitted signal and a detected signal relating to the retransmission signal. The signal detection unit has a synthesis unit for synthesizing the detected retransmission signal with a signal detected from the received signals containing at least one associated signals received prior to the retransmission signal.

Description

technical field [0001] The present invention relates to a communication device, a communication system, a receiving method, and a communication method, and particularly relates to a communication device, a communication system, a receiving method, and a communication method to which automatic repeat control is applied. [0002] this application claims priority based on Japanese Patent Application No. 2008-179111 for which it applied to Japan on July 9, 2008, and uses the content here. Background technique [0003] As an error control method in a communication system, there is, for example, Hybrid Automatic Repeat reQuest (HARQ) (Hybrid Automatic Repeat Quest: ARQ) combined with error correction codes such as Turbo coding described in Non-Patent Document 1 and Non-Patent Document 2. -ARQ). HARQ is a technique in which when a receiver detects an error in a received signal, it requests retransmission from the transmitter, and decodes a composite signal of the re-received signa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7103H04L1/18H04B1/707H04J13/00
CPCH04J11/0043H04L1/1893H04L1/1829H04L1/0048H04L1/1812H04J13/0044H04L1/0069
Inventor 吉本贵司野上智造山田良太示泽寿之
Owner SHARP KK
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