# US 2019/0356401 A1 ยท Analog signal transmission with multiple antennas > Agents: this data is available as JSON from the patentgrep API and MCP server โ€” see https://patentgrep.com/llms.txt - Number: US 2019/0356401 A1 - Document ID: US20190356401A1 - Status: Published application - Kind: A1 - Application number: 16/466,035 - Filed: 2017-11-30 - Published: 2019-11-21 - Earliest claimed: 2016-12-13 - Assignees: Amimon Ltd. - Applicants: Amimon Ltd. - Inventors: Dror Shalom Levy; Zvi Reznic; Arie Israel; Ron Yogev - Web page: https://patentgrep.com/patent/US20190356401A1 ## CPC - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04B 7/06: at the transmitting station - H04B 17/24: with feedback of measurements to the transmitter - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0023: {Time-frequency-space} - H04N 21/42676: {for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method for analog transmission of video from a transmitter using multiple transmit antennas includes transmitting analog video signals through at least two antennas to a receiver, monitoring at the receiver an attribute of the channels between the transmit antennas and an antenna of the receiver, and changing a phase and magnitude of an analog video signal being transmitted through at least one of the at least two antennas responsive to the monitoring. Additionally, a method for analog transmission of video signals using multiple transmit antennas includes space-time coding. ## Claims ### Claim 1 A method for analog transmission of video from a transmitter using multiple transmit antennas, the method comprising: transmitting analog video signals through at least two antennas to a receiver; monitoring at the receiver an attribute of the channels between the transmit antennas and an antenna of the receiver; and changing a phase and magnitude of an analog video signal being transmitted through at least one of said at least two antennas responsive to said monitoring. ### Claim 2 (depends on 1) The method according to claim 1, wherein said changing a phase and magnitude comprises: multiplying said analog video signal being transmitted through at least one of said at least two antennas by a complex number. ### Claim 3 (depends on 2) A The method according to claim 2, comprising: multiplying a baseband signal of said analog video signal by a factor of โˆ’1 or 1. ### Claim 4 (depends on 1) A The method according to claim 1, further comprising: transmitting digital signals through said at least two antennas of said multiple transmit antennas. ### Claim 5 (depends on 4) The method according to claim 4, wherein said attribute comprises a signal to noise ratio (SNR) associated with reconstructed analog signals and reconstructed digital signals. ### Claim 6 (depends on 4) The method according to claim 4, wherein said changing occurs when said SNR of a reconstructed digital video signal is greater than that of a reconstructed analog video signal. ### Claim 7 (depends on 4) The method according to claim 4, wherein said digital video signals are space-time coded. ### Claim 8 (depends on 4) A The method according to claim 4, wherein said transmitting of digital video signals and analog video signals comprises orthogonal frequency-division multiplexing (OFDM). ### Claim 9 (depends on 1) A The method according to claim 1, wherein changing phase comprises switching between ports in a differential signal in the transmitter. ### Claim 10 (depends on 9) A The method according to claim 9, wherein the differential signal is generated at an interface of a base-band modem and a (radio frequency (RF) circuit in the transmitter. ### Claim 11 A system for analog transmission of video, comprising: a transmitter with multiple antennas, said transmitter suitable to transmit analog video signals through at least two antennas of said multiple antennas; and a receiver suitable to monitor an attribute of the channels between said at least two transmitting antennas and an antenna of said receiver; wherein said transmitter is configured to change a phase and magnitude of an analog video signal being transmitted through at least one of said at least two transmitting antennas responsive to the monitoring. ### Claim 12 (depends on 11) The system according to claim 11, wherein said transmitter changes a phase and magnitude by multiplying said analog video signal being transmitted through at least one of said at least two antennas by a complex number. ### Claim 13 (depends on 12) The system according to claim 12, wherein said transmitter multiplies a baseband signal of said analog video signal by a factor of โˆ’1 or 1. ### Claim 14 (depends on 11) The system according to claim 11, wherein said transmitter is suitable to transmit digital signals through said at least two antennas of said multiple transmit antennas. ### Claim 15 (depends on 14) The system according to claim 14, wherein said attribute comprises a signal to noise ratio (SNR) ratio associated with analog signals and digital signals reconstructed by said receiver. ### Claim 16 (depends on 14) The system according to claim 14, wherein said changing occurs when said SNR of a digital video signal received by said receiver is greater than that of a reconstructed analog video signal. ### Claim 17 (depends on 14) The system according to claim 14, wherein said digital video signals are space-time coded. ### Claim 18 (depends on 14) The system according to claim 14, wherein said digital video signals and analog video signals transmitted by said transmitter comprises orthogonal frequency-division multiplexing (OFDM). ### Claim 19 (depends on 11) The system according to claim 11, wherein said transmitter changes phases by switching between ports in a differential signal. ### Claim 20 (depends on 11) The system according to claim 11, wherein said differential signal is generated at an interface of a baseband modem and a radio frequency (RF) circuit in said transmitter. ### Claim 21 A method comprising: performing analog transmission of video signals by using multiple transmit antennas and space-time code. ### Claim 22 (depends on 21) The method of claim 21, wherein the space-time code is Alamouti code. ### Claim 23 (depends on 21) The method of claim 21, wherein said performing analog transmission comprises converting an analog video signal to a complex analog signal prior to transmission. ### Claim 24 (depends on 21) The method of claim 21, wherein said analog transmission comprises orthogonal frequency-division multiplexing (OFDM). ### Claim 25 A system for analog transmission of video signals comprising: a transmitter with multiple antennas, wherein said transmitter is suitable to transmit through said multiple antennas using space-time code. ### Claim 26 (depends on 25) The system of claim 25, wherein said space-time code is Alamouti code. ### Claim 27 (depends on 25) The system of claim 25, wherein said analog transmission comprises converting an analog video signal to a complex analog signal prior to transmission. ### Claim 28 (depends on 25) The system of claim 25, wherein said analog transmission comprises orthogonal frequency-division multiplexing (OFDM).