Data transmission method for a mobile communication system

• US 9,042,348 B2
• Filed: 12/19/2013
• Issued: 05/26/2015
• Est. Priority Date: 03/03/2003
• Status: Expired due to Term

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Tamaki, Satoshi, Hanaoka, Seishi, Kato, Takeshi, Yano, Takashi
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US14/133,869
• Publication Number:
  US 20140105323A1
• Time in Patent Office: 523 Days
• Field of Search: 455/101, 455/102, 455/562.1, 455/103, 455/575.7, 370/310, 370/334
• US Class Current: 370/334
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0848 Joint weighting
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining
• CPC Class Codes: H04L 2001/0096 Channel splitting in point-to-point links
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

This invention provides a mobile communication system which expanded the operation limitation of the heretofore adopted mobile communication systems and improved the spectrum efficiency greatly. A data transmission method for use in the mobile communication system of the present invention includes means for channel pluralizing by which to expand the Shannon limit and means for interference reduction by which to expand the interference limit. More specifically, a transmitting module comprises M units of modulators and L units of transmitting antennas, generates L units of signals by multiplying M units of modulated signals by a complex matrix consisting of M×L units of elements, and transmits the L units of signals from the L units of transmitting antennas.

Claims

1. An information processing device comprising:

a modulator which generates a plurality of modulation symbols;

a converter which converts the plurality of modulation symbols into M units of signals (where 2≦

M);

a processor which performs beam forming of the M units of signals by using a complex matrix whose size is L×

M, and outputs L units of beam formed signals (where 2≦

L).

2. The information processing device according to claim 1, wherein

the complex matrix is set based on conditions of propagation channels between a transmitting station and a receiving station.

3. The information processing device according to claim 1, wherein

the complex matrix is constrained such that a sum of transmitting powers of each of the complex matrix elements is a constant value.

4. The information processing device according to claim 1, wherein

if there is no reliable information on the conditions of propagation channels between the transmitting station and the receiving station, the processor generates L units of signals by using a complex matrix for transmitting diversity without performing beam forming.

5. An information processing device comprising a processor, wherein

the processor generates a plurality of modulation symbols, converts the plurality of modulation symbols into M units of signals (where 2≦

M), performs beam forming of the M units of signals by using a complex matrix whose size is L×

M, and outputs L units of beam formed signals (where 2≦

L).

6. The information processing device according to claim 5, wherein

the complex matrix is set based on conditions of propagation channels between a transmitting station and a receiving station.

7. The information processing device according to claim 5, wherein

the complex matrix is constrained such that a sum of transmitting powers of each of the complex matrix elements is a constant value.

8. The information processing device according to claim 5, wherein

If there is no reliable information on the conditions of propagation channels between the transmitting station and the receiving station, the processor generates L units of signals by using a complex matrix for transmitting diversity without performing beam forming.

9. A transmitting station comprising:

a modulation unit which generates a plurality of modulation symbols;

a conversion unit which converts the plurality of modulation symbols into M units of signals (where 2≦

M);

a processing unit which performs beam forming of the M units of signals by using a complex matrix whose size is L×

M, and outputs L units of beam formed signals (where 2≦

L).

10. The transmitting station according to claim 9, wherein

the complex matrix is set based on conditions of propagation channels between the transmitting station and a receiving station.

11. The transmitting station according to claim 9, wherein

the complex matrix is constrained such that a sum of transmitting powers of each of the complex matrix elements is a constant value.

12. The transmitting station according to claim 9, wherein

if there is no reliable information on the conditions of propagation channels between the transmitting station and the receiving station, the processing unit generates L units of signals by using a complex matrix for transmitting diversity without performing beam forming.