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Interleave apparatus and interleave method

A technology of starting position and bit, applied in the field of interleaving device and interleaving, which can solve problems such as transmission quality deterioration

Active Publication Date: 2007-11-21
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because in an OFDM symbol, data is mapped to a plurality of subcarriers with different frequencies, so the data whose transmission quality deteriorates due to frequency selective fading is only the data mapped to a part of the subcarriers.

Method used

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  • Interleave apparatus and interleave method
  • Interleave apparatus and interleave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] 2 is a block diagram showing the configuration of a wireless communication device including an interleaving device according to Embodiment 1 of the present invention. The wireless communication device shown in FIG. 2 includes: an error correction coding unit 101, an interleaver 102, a mapping unit 103, an IFFT (Inverse Fast Fourier Transform: Inverse Fast Fourier Transform) unit 104, and a GI (Guard Interval: Guard Interval) insertion unit 105 , IQ (In-phase Quadrature) modulation unit 106, RF (Radio Frequency: radio frequency) transmission unit 107, RF reception unit 108, IQ demodulation unit 109, GI removal unit 110, FFT (Fast Fourier Transform: Fast Fourier Transform) A unit 111 , a demapping unit 112 , a deinterleaver 113 , an error correction decoding unit 114 , a retransmission request extraction unit 115 and a retransmission control unit 116 .

[0033] In addition, the interleaver 102 includes: a data holding unit 1021 , a first index calculation unit 1022 , a se...

Embodiment approach 2

[0108] Embodiment 2 of the present invention is characterized in that the start position of reading the bit string from the interleaver is more significantly different between two consecutive transmissions (for example, the first retransmission and the second retransmission). , so that the subcarriers to which the same bit is mapped are further separated from each other during retransmission.

[0109] FIG. 8 is a block diagram showing the configuration of a wireless communication device including an interleaving device according to the present embodiment. In this figure, the same reference numerals are assigned to the same parts as those in FIG. 2 , and description thereof will be omitted. The wireless communication device shown in FIG. 8 further adds a retransmission count conversion unit 401 to the wireless communication device in FIG. 2 .

[0110]Retransmission count conversion section 401 converts the retransmission count notified from retransmission control section 116 a...

Embodiment approach 3

[0118] Embodiment 3 of the present invention is characterized in that the start position of reading a bit string from the interleaver is determined according to the characteristics of frequency selective fading.

[0119] FIG. 9 is a block diagram showing the configuration of a wireless communication device including an interleaving device according to the present embodiment. In this figure, the same reference numerals are assigned to the same parts as those in FIG. 2 , and description thereof will be omitted. The wireless communication device shown in FIG. 9 further adds a power measurement unit 501 and a start position determination unit 502 to the wireless communication device in FIG. 2 , and includes a third index calculation unit 1024a instead of the third index calculation unit 1024 in FIG. 2 .

[0120] Power measurement section 501 measures the power of each subcarrier during the fast Fourier transform in FFT section 111 .

[0121] Start position determining section 502...

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Abstract

An interleave apparatus and an interleave method for preventing an increase in the number of retransmissions to improve the throughput. In a wireless communication apparatus having the interleave apparatus, a data holding part (1021) two-dimensionally arranges and holds bit sequences. A first index calculating part (1022) sequentially calculates first indexes to be used for reading, in a column direction, the bit sequences arranged in a row direction. A second index calculating part (1023) sequentially calculates second indexes to be used for reversing the order of the upper-order and lower-order bits to be read from the even-numbered columns when the bit sequences are read in accordance with the first indexes. A third index calculating part (1024) sequentially calculates third indexes to be used for reading the bit sequences from a different start position in accordance with the number of retransmissions. A reading part (1025) reads the bit sequences in the order that is in accordance with the third indexes. A mapping part (103) maps the read bit sequences to the respectively corresponding subcarriers.

Description

technical field [0001] The present invention relates to an interleaving device and an interleaving method, in particular to an interleaving device and an interleaving method for interleaving data transmitted by multi-carriers using a plurality of carriers with different center frequencies. Background technique [0002] In the wireless LAN (Local Area Network) based on standards such as IEEE (Institute of Electrical and Electronics Engineers) 802.11a and IEEE 802.11g that have been widely studied in recent years, OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) is used as a wireless transmission method. )modulation. OFDM modulation is a technology that can improve frequency utilization efficiency and realize high-speed data transmission by transmitting data using multiple subcarriers whose frequencies are orthogonal to each other. [0003] In addition, the OFDM symbols obtained after OFDM modulation are not easily affected by freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H03M13/27
CPCH04L5/0007H04L1/0071H04L5/006H04L1/18H04L5/0046H04L1/1893H04L1/08H04L1/1812
Inventor 中胜义今村大地今井友裕山崎纯也
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA