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Wireless communication system, transmitter apparatus, receiver apparatus, and communication method

A technology of wireless communication system and transmission equipment, applied in the direction of wireless communication, transmission system, baseband system, etc., can solve the problem that the intersection point is not improved and so on

Inactive Publication Date: 2011-04-13
OSAKA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in Figure 11 In (b), the corresponding input and output features intersect, and when plotting trajectories, there is no improvement at the intersection point

Method used

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  • Wireless communication system, transmitter apparatus, receiver apparatus, and communication method
  • Wireless communication system, transmitter apparatus, receiver apparatus, and communication method
  • Wireless communication system, transmitter apparatus, receiver apparatus, and communication method

Examples

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no. 1 example

[0073] As a first embodiment, a description will be made for the case of adaptively controlling the ratio at which the frequency spectrum is clipped when overlapping is not allowed. An example of a sending device (mobile station device) is figure 1 shown. The sending device includes a coding unit 1, an interleaver 2, a modulation unit 3, a DFT unit 4, a propagation path information detection unit 5, a primary spectrum shaping unit 6, a subtraction information detection unit 7, a secondary spectrum shaping unit 8, an IDFT (discrete Fourier transform Inverse transform) unit 9 , pilot signal generation unit 10 , pilot signal multiplexing unit 11 , CP insertion unit 12 , wireless unit 13 , and transmission antenna 14 .

[0074] First, error correction coding is performed on the information bits in the coding unit 1, and the obtained coded bits are rearranged in the interleaver 2. The interleaved coded bits are modulated in the modulation unit 3 and converted into frequency sign...

no. 2 example

[0125] In the first embodiment, the description has been made on the case where signals from all transmission devices are made to be orthogonal on the frequency axis without overlapping. However, since the reception device (base station device) has an interference prevention function, even when overlap occurs, even signals from other transmission devices can be input to the canceller for the overlapped spectrum, and each transmission device is detected in the canceller. The intersymbol interference component in the signal, and when eliminated together, the signal can be completely separated.

[0126] Figure 6 The concept of primary spectrum shaping and secondary spectrum shaping when overlapping of signals of each transmitting device is shown. Figure 6 (a) shows the concept of primary spectrum shaping (overlapping spectrum B1), and the control is based on the same water filling principle as that of the first embodiment, so its description is omitted. Figure 6 (b) shows th...

no. 3 example

[0134] As a third embodiment, the embodiments so far have shown the case where the encoding rates of all transmitting devices are the same, however, in this embodiment, the encoding rate of the error correction coding applied by each transmitting device can also be controlled together. When the error correction coding is convolutional coding, the coding rate is 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3, 1 / 2, 2 / 3, 3 / 4, 4 / In the case of 5, 5 / 6, 6 / 7 and 7 / 8, the input and output characteristics of the mutual information of the decoder are as follows Figure 12 shown. In the figure, 201 denotes a decoder characteristic of a coding rate of 1 / 8, and similarly, 202 to 212 respectively denote decoder characteristics of a coding rate in the order described above. Additionally, with Figure 11 In the same way, the vertical axis shows the decoder input mutual information, and the horizontal axis shows the decoder output mutual information. Since both input and output characteristics are uniquely d...

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Abstract

The clipping rate is controlled in a spectrum shaping according to a propagation path, thereby improving the transmission characteristic so that communication can be performed at a stable transmission speed. A propagation path information detecting part (5), which is adapted to detect propagation path information fed back from a base station apparatus, detects a propagation path characteristic. A primary spectrum shaping part (6) applies the water-filling theorem, in which the energy is distributed in accordance with the propagation path characteristic, to a transport spectrum obtained by a DFT part (4). A clipping information detecting part (7) detects clipping information of secondary spectrum shaping fed back from the base station apparatus, and a secondary spectrum shaping part (8) performs a secondary spectrum shaping. At this moment, the rate of the clipping performed by the secondary spectrum shaping part (8) adaptively controls the clipping rates of all transmitter apparatuses multiplexed by a scheduling part (26) of the base station apparatus.

Description

technical field [0001] The present invention relates to a wireless communication system, a transmitting device, a receiving device, and a communication method for controlling a clipping rate in spectrum shaping according to a propagation path in a wireless communication system such as an SC-FDMA system that performs communication using a spread spectrum signal. Background technique [0002] In recent years, a lot of research has been done on next-generation mobile communication systems, and a single-frequency reuse cellular system has been proposed as a system to improve system frequency utilization in which each cell uses the same frequency band so that each cell can use the allocated to the entire frequency band of the system. [0003] In the downlink (communication from the base station equipment to the mobile station), the OFDMA (Orthogonal Frequency Division Multiple Access) system is the most usable candidate. An OFDMA system is a system that performs communication by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B7/005H04J1/00H04L27/01
CPCH04L25/03159H04J11/00H04W52/346H04L27/2626H04L27/2614H04W52/24H04L25/03834
Inventor 衣斐信介三瓶政一宫本伸一横枕一成洼田稔浜口泰弘藤晋平中村理
Owner OSAKA UNIV
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