Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus

• US 8,125,963 B2
• Filed: 07/29/2004
• Issued: 02/28/2012
• Est. Priority Date: 08/04/2003
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Hara, Yoshitaka, Taira, Akinori, Otsuki, Tomoaki, Sudo, Kenji
• Primary Examiner(s): Patel, Nimesh
• Application Number:
  US10/567,339
• Publication Number:
  US 20080056217A1
• Time in Patent Office: 2,770 Days
• Field of Search: 455/454, 455/562.1, 455/560.1, 455/575.7, 455/553.1, 455/95, 455/450, 455/501, 375/267, 375/299, 370/267, 370/334, 370/347, 370/610, 370/342
• US Class Current: 370/334
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• 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 7/0684 using different training sequences per antenna
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A radio communication method and apparatus generate a plurality of information signals and transmit the signals to a communication partner from a plurality of antennas. A plurality of combination of signals to be transmitted are selected. A transmission evaluation value is determined based on the signal noise ratio of each signal. After all combinations are evaluated, a transmission format suitable for sending a combination of signals is determined based on a highest evaluation value.

Claims

1. A radio communication method by a radio communication system in which output signals are generated from a plurality of information signals and then transmitted respectively at a plurality of different frequencies to a system of a communication partner from N antennas, the method comprising:

receiving control information by a control signal which is transmitted by the system of the communication partner; and

transmitting transmission signals respectively at the plurality of frequencies from the N antennas based on the received control information, the transmission signals each being generated based on a first operation result, which is obtained by multiplying a first information signal by a first N-dimensional weight vector, and a second operation result, which is obtained by multiplying a second information signal by a second N-dimensional weight vector, wherein

the control information includes weight-related information including a set of the first N-dimensional weight vector and the second N-dimensional weight vector,

the first information signal and the second information signal include one of a set of signals modulated by different modulation schemes and a set of signals encoded by different encoding methods, and

the weight-related information is common to all of the plurality of frequencies used for signal transmission from the radio communication system to the system of the communication partner.

2. A radio communication system in which output signals are generated from a plurality of information signals and then transmitted respectively at a plurality of different frequencies to a system of a communication partner from N antennas, comprising:

reception means for receiving control information by a control signal which is transmitted by the system of the communication partner; and

transmission means for transmitting transmission signals respectively at the plurality of frequencies from the N antennas based on the received control information, the transmission signals each being generated based on a first operation result, which is obtained by multiplying a first information signal by a first N-dimensional weight vector, and a second operation result, which is obtained by multiplying a second information signal by a second N-dimensional weight vector, wherein

the control information includes weight-related information including a set of the first N-dimensional weight vector and the second N-dimensional weight vector,

the first information signal and the second information signal include one of a set of signals modulated by different modulation schemes and a set of signals encoded by different encoding methods, and

the weight-related information is common to all of the plurality of frequencies used for signal transmission from the radio communication system to the system of the communication partner.