Modulation and equalization in an orthonormal time-frequency shifting communications system

• US 8,976,851 B2
• Filed: 06/25/2013
• Issued: 03/10/2015
• Est. Priority Date: 05/26/2011
• Status: Active Grant

• Current Assignee: Cohere Technologies Inc
• Original Assignee: Cohere Technologies Inc
• Inventors: Hadani, Ronny, Rakib, Salim Shlomo
• Primary Examiner(s): ODOM, CURTIS B
• Application Number:
  US13/927,092
• Publication Number:
  US 20140169433A1
• Time in Patent Office: 623 Days
• Field of Search: 375/229, 375/260, 375/267, 370203-211
• US Class Current: 375/229
• CPC Class Codes: H04B 3/237 using two adaptive filters, e.g. for near end and for end echo cancelling
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

A method which includes receiving a first modulated signal from a first user device, the first modulated signal being generated based upon a time-frequency transformation of first user data. The method further includes receiving a second modulated signal from a second user device, the second modulated signal being generated based upon a time-frequency transformation of second user data. The first modulated signal and the second modulated signal are then processed.

Claims

1. A method, comprising:

wirelessly receiving a first modulated signal from a first user device, the first modulated signal being generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first transmission interval of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency;

wirelessly receiving a second modulated signal from a second user device, the second modulated signal being generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a different transmission interval of the OTFS transmission matrix; and

processing the first modulated signal and the second modulated signal.

2. A method, comprising:

wirelessly receiving a first modulated signal from a first user device, the first modulated signal being generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first frequency band of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency;

wirelessly receiving a second modulated signal from a second user device, the second modulated signal being generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a different frequency band of the OTFS transmission matrix; and

processing the first modulated signal and the second modulated signal.

3. A method, comprising:

wirelessly receiving a first modulated signal from a first user device, the first modulated signal being generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first area of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency;

wirelessly receiving a second modulated signal from a second user device, the second modulated signal being generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a second area of the OTFS transmission matrix; and

processing the first modulated signal and the second modulated signal.

4. A wireless device comprising:

an antenna;

a receiver coupled to the antenna, the receiver being configured to;

receive a first modulated wireless signal from a first user device wherein the first modulated wireless signal is generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first transmission interval of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency, and

receive a second modulated wireless signal from a second user device wherein the second modulated wireless signal is generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a different transmission interval of the OTFS transmission matrix; and

a processor in communication with the receiver, the processor being configured to process the first modulated signal and the second modulated signal.

5. A wireless device comprising:

an antenna;

a receiver coupled to the antenna, the receiver being configured to;

receive a first modulated wireless signal from a first user device wherein the first modulated wireless signal is generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first frequency band of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency, and

receive a second modulated wireless signal from a second user device wherein the second modulated wireless signal is generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a different frequency band of the OTFS transmission matrix; and

a processor in communication with the receiver, the processor being configured to process the first modulated signal and the second modulated signal.

6. A wireless device comprising:

an antenna;

a receiver coupled to the antenna, the receiver being configured to;

receive a first modulated wireless signal from a first user device wherein the first modulated wireless signal is generated based upon a time-frequency transformation of first user data wherein the first user data is associated with a first area of an orthonormal time frequency shifting (OTFS) transmission matrix having dimensions of time and frequency, and

receive a second modulated wireless signal from a second user device wherein the second modulated wireless signal is generated based upon a time-frequency transformation of second user data wherein the second user data is associated with a second area of the OTFS transmission matrix; and

a processor in communication with the receiver, the processor being configured to process the first modulated signal and the second modulated signal.