CDMA TRANSMISSION APPARATUS AND CDMA TRANSMISSION METHOD

• US 20070253506A1
• Filed: 06/22/2007
• Published: 11/01/2007
• Est. Priority Date: 05/09/2003
• Status: Active Grant

• Current Assignee: INVT SPE LLC (SoftBank Group Corp.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: SUDO, Hiroaki
• Granted Patent: US 7,764,711 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 14/005 Optical Code Multiplex
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems

Abstract

A control section (110) recognizes the type of data included in a transmission signal and outputs a control signal (C1) to an S/P conversion section (101) and a spreading control section (107). The S/P conversion section (101) apportions a specific type of data output from the control section (110) to different transmission systems. Spreading sections (102, 103) carry out spreading processing on the specific type of data output from the S/P conversion section (101) with different spreading codes assigned thereto under the control of the spreading control section (107). The data output from the spreading sections (102, 103) is transmitted by radio through addition sections (104-1, 104-2), transmission sections (105-1, 105-2) and antennas (106-1, 106-2). In this way, it is possible to improve the reception performance on the receiving side for specific data while maintaining the transmission efficiency of an MIMO communication system.

Claims

1. A transmitting apparatus employing a MIMO (multi-input/multi-output) scheme of transmitting a plurality of data items for a same receiving apparatus using a plurality of antennas in parallel, the transmitting apparatus comprising:

a mapping section that maps the plurality of data items to one of the plurality of antennas; and

a transmitting section that transmits the plurality of data items using the one of the plurality of antennas to the receiving apparatus,

wherein the mapping section maps a specific data item of the plurality of data items such that a communication employing the MIMO scheme is not executed.

2. The transmitting apparatus according to claim 1, wherein the specific data item comprises user data requiring a better communication quality than other user data.

3. The transmitting apparatus according to claim 1, wherein the transmitting section transmits the specific data item using the one of the plurality of antennas repeatedly.

4. A communication terminal apparatus, comprising the transmitting apparatus according to claim 1.

5. A base station apparatus, comprising the transmitting apparatus according to claim 1.

6. A transmitting method employing a MIMO (multi-input/multi-output) scheme of transmitting a plurality of data items for a same receiving apparatus using a plurality of antennas in parallel, the transmitting method comprising:

a mapping step of mapping the plurality of data items to one of the plurality of antennas; and

a transmitting step of transmitting the plurality of data items using the one of the plurality of antennas to the receiving apparatus,

wherein, in the mapping step, a specific data item of the plurality of data items is mapped such that a communication employing the MIMO scheme is not executed.