MULTI-ANTENNA TRANSMITTING APPARATUS AND RETRANSMITTING METHOD OF MULTI-ANTENNA TRANSMITTING APPARATUS

• US 20090046008A1
• Filed: 11/25/2005
• Published: 02/19/2009
• Est. Priority Date: 01/14/2005
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Murakami, Yutaka, Kobayashi, Kiyotaka
• Granted Patent: US 7,889,130 B2
• Time in Patent Office: Days
• US Class Current: 342/373
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04J 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A multi-antenna transmitting apparatus wherein a relatively simple selection procedure can be used to reconcile the data transmission rate and the received data quality. When a transport signal, which is required to have a higher quality than other signals, is to be transmitted, a vector multiplexing part (105) reduces the number of transport beams (i.e., reduces the number of unique paths used for transmission), and further gives a higher priority to a unique vector belonging to a large unique value and uses that unique vector to vector multiplex the transport signal, thereby forming a transport beam (i.e., gives a higher priority to a signal, which is required to have a high quality, and transmits that signal by use of a unique path having a large path gain).

Claims

1. A multi-antenna transmitting apparatus comprising:

a multiplexed frame generating section that forms transmission signals corresponding to a plurality of channels performing multiplex transmission at the same time;

a vector multiplexing section that forms a transmission beam by vector multiplexing the transmission signals for a plurality of channels using eigen vectors belonging to eigen values of a spatial correlation matrix between a plurality of transmit and receive antennas and supplying the transmission signals to the plurality of antennas; and

a beam control section that controls the vector multiplexing section so that, when transmission signals requiring higher quality compared to other signals are transmitted, the transmission beam is formed by reducing the number of transmission beams and vector multiplexing the transmission signals preferentially using eigen vectors belonging to large eigen values.

2. The multi-antenna transmitting apparatus according to claim 1, wherein the transmission signal requiring higher quality compared to the other signals is a preamble or a control information symbol.

3. The multi-antenna transmitting apparatus according to claim 1, wherein:

the transmission signal requiring higher quality compared to the other signals is a retransmission signal; and

the beam control section controls the vector multiplexing section so that, when the retransmission signal is transmitted, the number of transmission beams is reduced compared to the previous transmission, and the retransmission signal is vector multiplexed using an eigen vector belonging to a larger eigen value than the previous transmission.

4. The multi-antenna transmitting apparatus according to claim 3, wherein signals vector multiplexed using an eigen vector belonging to a maximum eigen value upon the previous transmission are vector multiplexed also using an eigen vector belonging to the maximum eigen value upon retransmission.

5. A retransmission method for a multi-antenna transmitting apparatus, comprising, when a retransmission signal is transmitted, reducing the number of transmission beams compared to the previous transmission and transmitting the retransmission signal using a transmission beam vector multiplexed using an eigen vector belonging to a larger eigen value than the previous transmission.

6. The retransmission method for the multi-antenna transmitting apparatus according to claim 5, wherein signals vector multiplexed using an eigen vector belonging to a maximum eigen value upon the previous transmission are vector multiplexed also using an eigen vector belonging to the maximum eigen value upon retransmission.