Wireless device

• US 9,900,785 B2
• Filed: 01/10/2014
• Issued: 02/20/2018
• Est. Priority Date: 01/15/2013
• Status: Expired due to Fees

• Current Assignee: National Institute of Information and Communications Technology
• Original Assignee: National Institute of Information and Communications Technology
• Inventors: Villardi, Gabriel Porto, Harada, Hiroshi
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Davis, Ronald h
• Application Number:
  US14/760,799
• Publication Number:
  US 20150365832A1
• Time in Patent Office: 1,502 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

A wireless device capable of enabling improvement in reliability of communication, enlargement of cell regions, improvement in PER and improvement in system performance is provided. The wireless device according to an embodiment is a wireless device which transmits information for a counterpart wireless device, and includes a signal processing unit which generates a symbol sequence; a transmission vector calculating unit which converts the symbol sequence into a plurality of transmission symbol sequences, and controls phases of the transmission symbol sequences to be a same phase or an opposite phase based on a channel estimation to the counterpart wireless device; and a plurality of antennas each of which transmits the plurality of transmission symbol sequences.

Claims

1. A wireless device to transmit information for a counterpart wireless device, comprising:

a signal processor to generate a symbol sequence;

a transmission vector calculator to convert the symbol sequence into a plurality of transmission symbol sequences, and control phases of the transmission symbol sequences to be a coordinate phase or an opposite phase based on a channel estimation to the counterpart wireless device;

a plurality of antennas to respectively transmit the plurality of transmission symbol sequences;

an uplink receiver to receive an uplink signal from the counterpart wireless device;

a channel estimating unit to estimate the channel estimation based on the uplink signal; and

an array gain controller to generate array interferences to the counterpart wireless device based on the channel estimation, and select an array interference having a higher gain of a signal for the counterpart wireless device from among the generated array interferences,

wherein the transmission vector calculator controls the phases to be a combination of phases in which the respective phases of the transmission symbol sequences generate the array interference selected by the array gain controlling unit.

2. A wireless device which receives information from a counterpart wireless device having a plurality of transmission antennas, comprising:

a channel estimating unit to generate a channel estimation from the counterpart wireless device based on a reception signal transmitted from the counterpart wireless device;

an array gain controller to generate array interferences from the counterpart wireless device based on the channel estimation, and select;

select an array interference having a higher gain for the reception signal from among the generated array interferences; and

a feedback transmitter to transmit information indicating a combination configured to generate the array interference selected by the array gain controlling unit from among combinations of phases of transmission symbol sequences transmitted from the plurality of respective transmission antennas to the counterpart wireless device.

3. The wireless device according to claim 2, further comprising:

a plurality of reception antennas configured to receive a plurality of the reception signals; and

a combining unit configured to combine each of the signals received by the plurality of reception antennas,

wherein the channel estimating unit generates the channel estimation based on a signal combined by the combining unit.