Wireless communication apparatus, and feedback information generating method

A wireless communication device and feedback information technology, applied in multiplexing communication, radio transmission system, channel estimation, etc., can solve the problem that the reversibility of the uplink and downlink propagation paths is not established, and the reverse propagation path information cannot be used, etc. question

Inactive Publication Date: 2008-04-23
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, in FDD, since the frequency bands of the uplink and downlink are different, the propagation path reversibility between the uplink and the downlink does not hold, and the reverse propagation path information cannot be used.

Method used

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  • Wireless communication apparatus, and feedback information generating method
  • Wireless communication apparatus, and feedback information generating method
  • Wireless communication apparatus, and feedback information generating method

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Embodiment approach 1

[0034] FIG. 1 is a block diagram showing the configuration of a receiving device 100 according to Embodiment 1 of the present invention. In this figure, receiving RF units 102-1 to 102-N convert carrier signals of wireless frequency bands received from transmitting devices through antennas 101-1 to 101-N into baseband signals, and output the converted baseband signals to channel Estimation unit 103 and MIMO demodulation unit 107 .

[0035] Channel estimation unit 103 demodulates pilot signals from the baseband signals output from receiving RF units 102-1 to 102-N, and performs channel estimation using the demodulated pilot signals. Here, a channel refers to a propagation path of a signal until a signal transmitted from a transmitting antenna is received at a receiving antenna. In this propagation path, due to the influence of multipath fading, the amplitude and phase of the signal will change. Channel estimation refers to measuring changes in this amplitude and phase. Furth...

Embodiment approach 2

[0065] FIG. 11 is a block diagram showing the configuration of a receiving device 400 according to Embodiment 2 of the present invention. FIG. 11 differs from FIG. 1 in that the amplitude / phase ratio decision unit 105 is changed to a resolution decision unit 401 .

[0066] In FIG. 11 , resolution judging section 401 judges the resolution at which propagation path information is quantized at feedback information generating section 402 based on the correlation value output from correlation detecting section 104, and outputs the judgment result (resolution for quantization) to Feedback information generation unit 402, and feeds back the indicator representing the determination result to the sending device.

[0067] Feedback information generating section 402 quantizes the channel information output from channel estimating section 103 based on the determination result output from resolution determining section 401 , and generates feedback information including the quantized amplit...

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Abstract

A wireless communication apparatus that allows propagation path information to be reproduced with high precision at a transmitting end without increasing feedback information amount. In this apparatus, a channel estimating part (103) uses a received pilot signal to perform channel estimation for each propagation path. A correlation detecting part (104) uses the result of the channel estimation to obtain correlation values between the channels, thereby detecting correlation values of all channels. An amplitude / phase ratio determining part (105) determines, based on the correlation values, the quantization bit ratio of the amplitude and phase of propagation path information to be used when those amplitude and phase are quantized. A feedback information generating part (106) quantizes the propagation path information in accordance with the determined ratio of the amplitude and phase.

Description

technical field [0001] The present invention relates to a wireless communication device and a method for generating feedback information used in a wireless communication system using MIMO (Multiple Input Multiple Output) technology in which multiple antennas receive signals from multiple antennas Wireless communication technology based on wireless signals. Background technique [0002] In recent years, studies have been conducted on transmission methods for realizing high-speed and large-capacity data transmission, and MIMO transmission technology using multiple antennas has attracted attention. In MIMO transmission, multiple antennas are used at the same time and frequency to transmit signals through multiple different propagation paths, thereby increasing transmission throughput. It is called Space Division Multiplexing (SDM: Space Division Multiplexing). [0003] The SDM method includes: antenna space SDM that transmits different signal streams from each antenna; and be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B1/707H04B7/04H04J15/00H04J99/00
CPCH04B7/0626H04B7/0421H04B7/065H04L25/0206H04L25/0204
Inventor 汤田泰明今井友裕星野正幸木村良平
Owner PANASONIC CORP
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