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Wireless communication base station device and pilot transmitting method

A technology of wireless communication and wireless communication system, applied in the field of wireless communication base station device and pilot frequency transmission, can solve the problems of frequency selective fading, deterioration of transmission characteristics, etc., and achieve the effect of improving interpolation accuracy

Inactive Publication Date: 2008-10-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when performing high-speed transmission in mobile communications, the influence of delayed waves due to multipath cannot be ignored, and transmission characteristics deteriorate due to frequency selective fading

Method used

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  • Wireless communication base station device and pilot transmitting method
  • Wireless communication base station device and pilot transmitting method
  • Wireless communication base station device and pilot transmitting method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] The base station according to this embodiment is a base station used in a wireless communication system in which subframes for multiple base stations to transmit mutually different data and subframes for multiple base stations to transmit mutually identical data The subframes are time multiplexed. The base station of this embodiment is particularly suitable for the following wireless communication system, that is, as shown in FIG. Hereinafter, it is referred to as a system in which multicast subframes) are time-multiplexed. Therefore, in the following description, a unicast subframe is used as a subframe for multiple base stations to transmit mutually different data, and a multicast subframe is used as a subframe for multiple base stations to transmit mutually identical data To illustrate with an example. In addition, the frame structure in this embodiment is the same as that in FIG. 1 .

[0045] FIG. 2 shows the configuration of the base station 100 according to the...

Embodiment approach 2

[0097] In Embodiment 1, the channel estimation value g calculated when performing channel estimation on multicast data i , as mentioned above is the channel estimate h in cell A i and the channel estimate l in cell B i The channel estimation value is mixed, so the channel estimation value cannot be used for channel estimation of unicast data.

[0098] Therefore, in the present embodiment, among the eigensequences and common sequences included in the scrambling sequence, a phase rotation specific to each base station that is different for each cell is given to the common sequence.

[0099] FIG. 16 shows the configuration of base station 500 according to this embodiment. Base station 500 is configured by including phase rotation units 501 and 502 in addition to the configuration shown in Embodiment 1 ( FIG. 2 ). In addition, in FIG. 16 , the same components as those in FIG. 2 are given the same reference numerals, and description thereof will be omitted.

[0100] In base sta...

Embodiment approach 3

[0109] In this embodiment, a case will be described in which mutually different multicast data are transmitted for each of a plurality of cell groups constituted by a plurality of cells. In this embodiment, for example, as shown in FIG. 18 , it is assumed that when cell group 1 is constituted by cells A to G and cell group 2 is constituted by cells H to N, multicast data 1 is transmitted in cells A to G of cell group 1. On the other hand, in the cells H to N of the cell group 2, the multicast data 2 different from the multicast data 1 is transmitted.

[0110] At this time, if the pilots for the multicast subframe are configured at the same position in all the cells, in the cells located at the boundary of the cell group (in FIG. 18 , cells A, B, M, and N), it is expected that the group channel estimation accuracy of broadcast data deteriorates. For example, it is expected that in the cells A and B of the cell group 1, the channel estimation accuracy of the multicast data 1 de...

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Abstract

A base station realizing enhancement of the interpolation accuracy of the channel estimate between sub-frames. In a base station (100), a scrambling section (105) carries out scrambling such that a predetermined pilot signal sequence is multiplied by a scrambling sequence containing both a sequence unique to the base station (100) and different with cells and a sequence common to base stations for each chip and generates a pilot sequence containing both a pilot for unicast sub-frame and a pilot for multicast sub-frame, a multiplexing section (106) for time-multiplexing the pilot sequence, the unicast data symbol, and a multicast data symbol for each sub-frame, and an S / P section (107) converts the pilot sequences, the unicast data symbols, and the multicast data symbols sequential serially inputted from the multiplexing section (106) the numbers of which are equal to the number of subcarries included in one OFDM symbol into parallel ones and outputs them to an IFFT section (108).

Description

technical field [0001] The present invention relates to a wireless communication base station device and a pilot transmission method. Background technique [0002] In recent years, in mobile communications, various information such as images and data have become objects of transmission in addition to voice. Along with this, the need for highly reliable and high-speed transmission is increasing. However, when high-speed transmission is performed in mobile communications, the influence of delayed waves due to multipath cannot be ignored, and transmission characteristics deteriorate due to frequency selective fading. [0003] As one of techniques for countering frequency selective fading, multi-carrier communication represented by OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) method has attracted attention. Multi-carrier communication is a technique for performing high-speed transmission by transmitting data using a plurality of...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04B7/26
Inventor 福冈将西尾昭彦南田智昭
Owner PANASONIC CORP
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