Method and apparatus for data transmission using multiple transmit antennas

• US 9,083,508 B2
• Filed: 03/12/2014
• Issued: 07/14/2015
• Est. Priority Date: 04/26/1996
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Inventors: Calderbank, Arthur Robert, Naguib, Ayman F., Seshadri, Nambirajan, Tarokh, Vahid
• Primary Examiner(s): Chung, Phung M
• Application Number:
  US14/206,201
• Publication Number:
  US 20140192920A1
• Time in Patent Office: 489 Days
• Field of Search: 714/792, 375/295
• US Class Current: 1/1
• CPC Class Codes: A01K 2217/075 inducing loss of function, i.e. knock out
• CPC Class Codes: C07K 14/78 Connective tissue peptides, e.g. collagen, elastin, laminin, fibronectin, vitronectin or cold insoluble globulin [CIG]
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 27/20 Modulator circuits; Transmitter circuits

Abstract

A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.

Claims

1. A method comprising:

converting each group of successive groups of k incoming bits into a first sequence of symbols and a second sequence of symbols;

modulating a carrier using the first sequence of symbols to generate a first modulated signal;

modulating a carrier using the second sequence of symbols to generate a second modulated signal; and

simultaneously transmitting the first modulated signal from a first transmitting antenna and the second modulated signal from a second transmitting antenna, wherein the first transmitting antenna differs from the second transmitting antenna.

2. The method of claim 1, wherein the first sequence and the second sequence are different from one another, forming a space-time diversity mapping between the incoming bits and the first sequence and the second sequence.

3. The method of claim 1, wherein the first modulated signal and the second modulated signal are simultaneously transmitted over a common frequency channel.

4. A system comprising:

a processor; and

a computer-readable medium storing instructions which, when executed by the processor, cause the processor to perform operations comprising;

converting each group of successive groups of k incoming bits into a first sequence of symbols and a second sequence of symbols;

modulating a carrier using the first sequence of symbols to generate a first modulated signal;

modulating a carrier using the second sequence of symbols to generate a second modulated signal; and

simultaneously transmitting the first modulated signal from a first transmitting antenna and the second modulated signal from a second transmitting antenna, wherein the first transmitting antenna differs from the second transmitting antenna.

5. The system of claim 4, wherein the first sequence and the second sequence are different from one another, forming a space-time diversity mapping between the incoming bits and the first sequence and the second sequence.

6. The system of claim 4, wherein the first modulated signal and the second modulated signal are simultaneously transmitted over a common frequency channel.

7. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising:

converting each group of successive groups of k incoming bits into a first sequence of symbols and a second sequence of symbols;

modulating a carrier using the first sequence of symbols to generate a first modulated signal;

modulating a carrier using the second sequence of symbols to generate a second modulated signal; and

simultaneously transmitting the first modulated signal from a first transmitting antenna and the second modulated signal from a second transmitting antenna, wherein the first transmitting antenna differs from the second transmitting antenna.

8. The computer-readable storage device of claim 7, wherein the first sequence and the second sequence are different from one another, forming a space-time diversity mapping between the incoming bits and the first sequence and the second sequence.

9. The computer-readable storage device of claim 7, wherein the first modulated signal and the second modulated signal are simultaneously transmitted over a common frequency channel.