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Interleave apparatus and interleave method

A technology of starting position and index, applied in the separation device of transmission path, orthogonal multiplexing system, error correction/detection using interleaving technology, etc., can solve problems such as transmission quality deterioration

Active Publication Date: 2012-07-18
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
  • Interleave apparatus and interleave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

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

[0033] In addition, the interleaver 102 includes: a data holding unit 1021, a first index calculation unit 1022, a second index calculation unit 1023, a third index calculation unit 1024, and a ...

Embodiment approach 2

[0108] The second embodiment of the present invention is characterized by the following point, that is, in two consecutive transmissions (for example, the first retransmission and the second retransmission), the start position of the bit string read from the interleaver is more significantly different , So that the subcarriers to which the same bit is mapped during retransmission are further separated from each other.

[0109] Picture 8 It is a block diagram showing the configuration of a wireless communication device equipped with an interleaving device according to this embodiment. In this figure, the figure 2 The same parts are given the same reference numerals, and their description is omitted. Picture 8 The wireless communication device shown in figure 2 The number of retransmission conversion unit 401 is also added to the wireless communication device of.

[0110] The number of retransmission conversion unit 401 converts the number of retransmissions notified from the ret...

Embodiment approach 3

[0118] The third embodiment of the present invention is characterized in that the start position of the bit string read from the interleaver is determined based on the characteristics of frequency selective fading.

[0119] Picture 9 It is a block diagram showing the configuration of a wireless communication device equipped with an interleaving device according to this embodiment. In this figure, the figure 2 The same parts are given the same reference numerals, and their description is omitted. Picture 9 The wireless communication device shown in figure 2 The wireless communication device also adds a power measurement unit 501 and a start position determination unit 502, and includes a third index calculation unit 1024a to replace figure 2 的third index calculation unit 1024.

[0120] The power measuring section 501 measures the power of each subcarrier during the fast Fourier transform of the FFT section 111.

[0121] The start position determination section 502 determines the ...

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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 tobe 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, and more particularly to an interleaving device and an interleaving method for interleaving data transmitted by multiple carriers on a plurality of carriers having mutually different center frequencies. Background technique [0002] In 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) is adopted as a wireless transmission method. Multiplexing) modulation. OFDM modulation is a technology that uses multiple subcarriers whose frequencies are orthogonal to each other to transmit data, thereby improving frequency utilization efficiency and realizing high-speed data transmission. [0003] In addition, the OFDM symbols that can be obtained after OFDM modulation are not easily affected by frequenc...

Claims

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Application Information

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