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Base station, communication method in base station, mobile radio station and communication method in mobile radio station

A communication method and mobile station technology, applied in wireless communication, space transmit diversity, digital transmission system, etc., capable of solving problems such as not preventing pilot signal interference

Inactive Publication Date: 2013-06-05
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this prior art does not prevent interference from pilot signals from other cells or other sectors
Moreover, the prior art cannot perform high-precision channel estimation while preventing interference from pilot signals from other cells or other sectors

Method used

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  • Base station, communication method in base station, mobile radio station and communication method in mobile radio station
  • Base station, communication method in base station, mobile radio station and communication method in mobile radio station
  • Base station, communication method in base station, mobile radio station and communication method in mobile radio station

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Embodiment Construction

[0078] (A) Outline of the present invention

[0079] · Cell structure and pilot configuration

[0080] figure 1 It is a schematic explanatory diagram of the present invention, as shown in (A), base station BS in cells A, B, and C A 、BS B 、BS C MIMO-OFDM communication with the mobile station is performed using four antennas 1 to 4 . The pilot signal configuration of antennas 1 to 4 of each base station A, B, and C is as follows: figure 1 As shown in (B), they are densely arranged in the direction of the frequency axis and overlapped in the time direction (in the first 4OFDM symbols of the frame). The pilot signals of antennas 1 to 4 of each base station are distinguished according to the pattern, such as figure 1 As shown in (C), P1 is the pilot signal for antenna 1, P2 is the pilot signal for antenna 2, P3 is the pilot signal for antenna 3, P4 is the pilot signal for antenna 4, and the pilot signal power It is set as P1>P2>P3>P4. It should be noted that from the bas...

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Abstract

The invention provides a base station, a communication method in the base station, a mobile radio station and a communication method in the mobile radio station. When the base station conducts communication with the mobile radio station through multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM), under the condition that the communication environment of the mobile radio station is good, multiple data stream transmission, namely, multiple input multiple output (MIMO) communication mode, is adopted. Under the condition that the communication environment of the mobile radio station is not good, single data stream transmission, namely single input multiple output (SIMO) communication mode, is adopted to send data and pilot signals. When MIMO-OFDM conducts communication, the base station conducts the following controls: enabling pilot signals which are used for channel estimation in the transmission process of the single data stream of a regulation community and pilot signals which are used for channel estimation in the transmission process of the single data stream of a regulation community of an adjacent community not to be coincident in the frequency direction and / or the timer shaft direction.

Description

[0001] This application is a divisional case of the original patent application No. 200680052160.4 (international application number: PCT / JP2006 / 305488, filing date: March 20, 2006, invention name: base station and its MIMO-OFDM communication method) Apply. technical field [0002] The present invention relates to a base station and its MIMO-OFDM communication method, in particular to using a plurality of OFDM sending devices to transmit pilot signals together with data from multiple antennas to A base station of a mobile station and a MIMO-OFDM communication method thereof. Background technique [0003] In many digital mobile communication systems, in order to compensate for the distortion of the data signal in a fading channel, the pilot signal is multiplexed on the data signal and transmitted from the transmission side. The receiving side receives the pilot signal transmitted from the transmitting side, compares the received pilot signal with the known pilot signal to es...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04B7/04H04W48/08
Inventor 实川大介关宏之
Owner FUJITSU LTD
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