# US 2014/0192920 A1 · Method and Apparatus for Data Transmission Using Multiple Transmit Antennas > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192920 A1 - Document ID: US20140192920A1 - Status: Published application - Kind: A1 - Application number: 14/206,201 - Filed: 2014-03-12 - Published: 2014-07-10 - Earliest claimed: 1996-04-26 - Assignees: AT&T Intellectual Property II, L.P. - Applicants: At&T Intellectual Property II, L.P. - Inventors: Arthur Robert Calderbank; Ayman F. Naguib; Nambirajan Seshadri; Vahid Tarokh - Web page: https://patentgrep.com/patent/US20140192920A1 ## CPC - H04L 1/0625: {Transmitter arrangements} - C07K 14/78: Connective tissue peptides, e.g. collagen, elastin, laminin, fibronectin, vitronectin or cold insoluble globulin [CIG] - H04B 7/0669: {using different channel coding between antennas (space-time coding H04L1/0618)} - H04B 7/0671: {using different delays between antennas} - H04B 7/0891: {Space-time diversity (rake receivers H04B1/7115; space-time decoding H04L1/0631)} - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0054: {Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms} - H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)} - H04L 1/0065: {Serial concatenated codes} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L 1/0618: {Space-time coding} - H04L 27/20: Modulator circuits; Transmitter circuits - A01K 2217/075: inducing loss of function, i.e. knock out - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - C07K: PEPTIDES (peptides in foodstuffs A23; obtaining protein compositions for foodstuffs, working-up proteins for foodstuffs A23J; preparations for medicinal purposes A61K; peptides containing beta-lactam rings C07D; cyclic dipeptides not having in their molecule any other peptide link than those which form their ring, e.g. piperazine-2,5-diones, C07D; ergot alkaloids of the cyclic peptide type C07D519/02; macromolecular compounds having statistically distributed amino acid units in their molecules, i.e. when the preparation does not provide for a specific; but for a random sequence of the amino acid units, homopolyamides and block copolyamides derived from amino acids C08G69/00; macromolecular products derived from proteins C08H1/00; preparation of glue or gelatine C09H; single cell proteins, enzymes C12N; genetic engineering processes for obtaining peptides C12N15/00; compositions for measuring or testing processes involving enzymes C12Q; investigation or analysis of biological material G01N33/00) - H04B: TRANSMISSION - A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS ## 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 ### Claim 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 the 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. ### Claim 2 (depends on 2) The method of claim 2, 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. ### Claim 3 A system for transmitting a digital signal using a plurality of n antennas, the 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 the 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. ### Claim 4 (depends on 3) The system of claim 3, 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. ### Claim 5 A computer-readable storage device storing instructions which, when executed by a 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 the 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. ### Claim 6 (depends on 5) The computer-readable device of claim 5, 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.