Reception device, transmission device, communication system, and communication method

A technology of receiving device and sending device, applied in the direction of transmission system, multiplex communication, digital transmission system, etc., can solve the problems of increased link capacity overhead, low throughput, increased end-to-end delay time, etc., to achieve The effect of reducing the number of retransmissions

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

AI Technical Summary

Problems solved by technology

[0014] However, when the number of retransmitted packets increases in hybrid automatic repeat (HARQ), there is a problem that the overhead of link capacity increases due to retransmitted packets
In addition, when the number of retransmissions of the signal transmitted from the transmitting device to the receiving device increases, there is also a problem that the end-to-end delay time increases
[0015] Therefore, there is a problem that the throughput during communication between the transmitting device and the receiving device is low

Method used

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

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no. 1 Embodiment approach

[0081] In the first embodiment, an iterative-parallel MCI canceller is used on the receiving device side. The iterative MCI canceller generates an MCI replica at the receiving side, and suppresses inter-code channel interference MCI by subtracting the MCI replica from the received signal.

[0082] figure 2 It is a schematic block diagram showing the configuration of the transmission device 100 according to the first embodiment of the present invention. The transmission device 100 includes code channel signal generating units 101-1 to 101-N (where N is the number of code multiplexing), a code multiplexing unit 102, an interleaver unit 103, and an IFFT (Inverse Fast Fourier Transform: Inverse Fast Fourier Transform) part 104, pilot signal generation part 105, multiplexing part 106, GI (Guard Interval: guard interval) insertion part 107, wireless transmission part 108, antenna 109, wireless reception part 110, separation part 111, retransmission control part 112, Retransmissio...

no. 2 Embodiment approach

[0227] In the first embodiment, a case where an iterative parallel type MCI canceller is used on the receiving device 500 side has been described. In the second embodiment, a case where an iterative-sequential MCI canceller is used on the receiving device side will be described.

[0228] Figure 17 It is a schematic block diagram showing the configuration of the receiving device 1600 according to the second embodiment of the present invention. In addition, since the sending device can communicate with figure 2 The transmission device 100 shown is implemented with the same configuration, so description is omitted.

[0229] The reception device 1600 includes an antenna 1601, a radio reception unit 1602, a separation unit 1603, a channel estimation unit 1604, a channel estimation value storage unit 1605, a GI removal unit 1606, an FFT unit 1607, a received signal storage unit 1608, and a received packet management unit 1609. , an interference canceller unit 1610 , a bit LLR s...

no. 3 Embodiment approach

[0243] In the first and second embodiments, a case where packets are multiplexed with spreading codes and inter-code channel interference (MCI) is removed with a canceller has been described. In this embodiment, a case will be described in which packets are spatially multiplexed using MIMO (Multiple Input Multiple Output) and signals of other streams are removed by an interference canceller. In addition, a case where an iterative SIC (Successive Interference Canceller: successive interference canceller) is used as the interference canceller will be described.

[0244] Figure 19 It is a schematic block diagram showing the configuration of the transmission device 1800 according to the third embodiment of the present invention. Transmitter 1800 includes stream signal generation units 1801-1 to 1801-N (where N is the number of streams), antennas 1809-1 to 1809-N, wireless reception unit 1810, separation unit 1811, retransmission control unit 1812, retransmission Control signal ...

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Abstract

Provided is a reception device which performs communication with a transmission device and includes: a reception unit which receives a signal in which a plurality of data signals are multiplexed, from the transmission device; and a data signal detection unit which judges whether the transmission data has been successfully detected for each of data signals according to the reception signals received by the reception unit. The reception unit further receives from the transmission device, a retransmission data signal corresponding to at least one of the data signals for which the transmission data detection has failed among the multiplexed data signals. The data signal detection unit uses the reception signal and the retransmission data signal so as to judge whether transmission data contained in a data signal corresponding to the retransmission data signal and in a data signal not corresponding to at least one retransmission data signal has been successfully re-detected among the multiplexed data signals.

Description

technical field [0001] The present invention relates to a receiving device, a transmitting device, a communication system and a communication method. [0002] this application claims priority based on Japanese Patent Application No. 2008-040228 for which it applied to Japan on February 21, 2008, and uses the content here. Background technique [0003] OFDM (Orthogonal Frequency Division Multiplexing) and OFDMA (Orthogonal Frequency Division Multiple Access) are known as multi-carrier transmission schemes. In the multi-carrier transmission scheme, the transmission device reduces the influence of multipath interference by adding a guard interval (GI: Guard Interval) interval. [0004] In these access methods, when there is an arrival wave exceeding the guard interval, inter-symbol interference (ISI: Inter Symbol Interference) will occur because the previous symbol enters the FFT (Fast Fourier Transform: Fast Fourier Transform) interval, In addition, inter-carrier interferenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04B1/707H04J11/00H04J99/00H04L29/08
CPCH04L1/005H04L1/1819H04L1/1854H04J11/004H04B1/7107H04L1/1893H04L1/1812H04L1/1845
Inventor 野上智造吉本贵司山田良太示泽寿之
Owner SHARP KK
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