Method and apparatus for data transmission using multiple transmit antennas

• US 9,780,922 B2
• Filed: 07/13/2015
• Issued: 10/03/2017
• Est. Priority Date: 04/26/1996
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Calderbank, Arthur Robert, Naguib, Ayman F., Seshadri, Nambirajan, Tarokh, Vahid
• Primary Examiner(s): Chung, Phung M
• Application Number:
  US14/797,647
• Publication Number:
  US 20150326352A1
• Time in Patent Office: 813 Days
• 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;

transmitting the first modulated signal from a first transmitting antenna; and

transmitting a second modulated signal from a second transmitting antenna, wherein the second modulated signal is generated using the second sequence of symbols, and wherein the first transmitting antenna differs from the second transmitting antenna.

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

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. The method of claim 3, wherein the common frequency channel has a bandwidth necessary for only one of the first modulated signal and the second modulated signal.

5. A system comprising:

a processor; and

a computer-readable storage device 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; and

transmitting the first modulated signal from a first transmitting antenna and a second modulated signal from a second transmitting antenna, wherein the second modulated signal is generated using the second sequence of symbols, and wherein the first transmitting antenna differs from the second transmitting antenna.

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

7. The system of claim 5, wherein the first modulated signal and the second modulated signal are simultaneously transmitted over a common frequency channel.

8. The system of claim 7, wherein the common frequency channel has a bandwidth necessary for only one of the first modulated signal and the second modulated signal.

9. 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; and

transmitting the first modulated signal from a first transmitting antenna and a second modulated signal from a second transmitting antenna, wherein the second modulated signal is generated using the second sequence of symbols, and wherein the first transmitting antenna differs from the second transmitting antenna.

10. The computer-readable storage device of claim 9, 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.

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

12. The computer-readable storage device of claim 11, wherein the common frequency channel has a bandwidth necessary for only one of the first modulated signal and the second modulated signal.