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Multi-carrier transmission apparatus and multi-carrier transmission method

A transmission device and multi-carrier technology, applied in multiplex communication, orthogonal multiplex system, electrical components, etc., can solve the problems of mutual interference of transmitted signals, improvement of bit error rate characteristics, etc.

Inactive Publication Date: 2009-12-09
OPTIS WIRELESS TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the conventional multi-carrier transmission device and multi-carrier transmission method have a problem in that although the bit error rate characteristics can be improved to some extent by combining turbo coding and OFDM communication method, or turbo coding and OFDM-CDMA communication method, when When simultaneous transmission is performed using multiple channels, mutual interference occurs between transmitted signals of different channels, and there is a limit to the improvement of bit error rate characteristics

Method used

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  • Multi-carrier transmission apparatus and multi-carrier transmission method
  • Multi-carrier transmission apparatus and multi-carrier transmission method
  • Multi-carrier transmission apparatus and multi-carrier transmission method

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Embodiment 1

[0033] figure 1 is a diagram showing the configuration of the multicarrier transmission device 100 according to this embodiment, figure 2 is a diagram showing the configuration of the coding section 101, and image 3 is a diagram showing allocation of transmission data for each subcarrier.

[0034] The multi-carrier transmission device 100 is mainly composed of an encoding unit 101, a modulation unit 102, a subcarrier allocation unit 103, an OFDM unit 104, an amplifier 105, an antenna 106, an FFT unit 107, a demodulation unit 108, and a transmission power control unit 109.

[0035] The encoding section 101 as the division section may be, for example, a turbo encoder, and outputs a part of unencoded input transmission data as systematic bit data to the modulation section 102, performs recursive convolutional encoding on the remaining part of the input transmission data, and converts This is output to the modulation section 102 as parity data. The encoding section 101 will b...

Embodiment 2

[0056] Figure 4 is a diagram showing the configuration of the multicarrier transmission device 400 according to Embodiment 2 of the present invention, and Figure 5 and Figure 6 is a diagram showing data allocation per subcarrier. This embodiment uses a communication method combining CDMA and multicarrier communication.

[0057] An effective fourth-generation communication method is an OFDM-CDMA communication method that combines CDMA and OFDM. This OFDM-CDMA communication method allows interference from other cells to be reduced by means of despreading processing, making it possible to perform communication even in the presence of interference from another cell, which is very different from OFDM in which , in the presence of scrambling, communication becomes completely impossible. In this example, Figure 4 configuration with figure 1 The difference is that a spreading unit 401 and a despreading unit 402 are provided. Figure 4 Other components in the figure 1 is th...

Embodiment 3

[0077] Figure 7 is a diagram showing the configuration of a multi-carrier transmission device 700 according to Embodiment 3 of the present invention, and Figure 8 is a diagram showing the configuration of the control section 702 . The feature of this embodiment is that a turbo code is used as an error correction code, and systematic bit data and parity bit data are individually adaptively modulated.

[0078] In this example, Figure 7 configuration with figure 1 The difference is that the modulation section 701 is composed of a modulation section 701a and a modulation section 701b, and a control section 702 is provided. Figure 4 Other components in the figure 1 are the same as in and are specified with figure 1 The same code in , whose description is omitted here.

[0079] The control section 702 outputs a control signal designating a modulation method set based on an RSSI (Received Signal Strength Indicator) signal level to the modulation section 701a and the modulat...

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PUM

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Abstract

The encoding part (101) performs turbo encoding on the data to be sent, and outputs parity bit data and systematic bit data requiring high quality. A modulation section (102) modulates parity bit data and systematic bit data. The subcarrier arranging part (103) rearranges the data to be sent, so that the systematic bit data will be arranged on the subcarrier near the center frequency, and the parity bit data will be arranged on the subcarrier near both ends. The OFDM section (104) performs Orthogonal Frequency Division Multiplexing on data to be transmitted, and arranges parity bit data and systematic bit data onto these subcarriers. This can remarkably improve the bit error rate characteristics of the data to be transmitted requiring good quality, and can prevent the quality degradation of the data to be transmitted requiring good quality.

Description

technical field [0001] The present invention relates to a multi-carrier sending device and a multi-carrier sending method. Background technique [0002] Error correction coding methods include turbo coding that has been adopted as a standard in 3GPP. The characteristic of this turbo coding is that it can obtain a very good bit error rate characteristic compared with other error correction methods. [0003] OFDM is an effective communication method of the fourth generation, and is regarded as important as the communication method of the fourth generation. On the other hand, since OFDM communication is no longer possible at all in the presence of interference, the OFDM-CDMA communication method is known to combine OFDM and CDMA, and even when there is interference from another cell, by means of The despreading process reduces interference from other cells, enabling communication to be performed. [0004] In this way, it is possible to improve bit error rate characteristics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00
Inventor 须藤浩章
Owner OPTIS WIRELESS TECH LLC
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