Space-time coded OFDM system for MMDS applications

• US 20080130772A1
• Filed: 01/29/2008
• Published: 06/05/2008
• Est. Priority Date: 11/06/2000
• Status: Active Grant

• Current Assignee: DIRECTV, LLC (AT&T, Inc.)
• Original Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Inventors: Hammons, A. Roger, Lee, Lin-Nan, Kay, Stan, Beidas, Bassel, El-Gamal, Hesham, Rozmaryn, Jack, MacDonald, Andrew
• Granted Patent: US 8,374,272 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 27/2602 Signal structure

Abstract

A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency coding. The base station includes a plurality of multiple-input multiple-output (MIMO) transceivers. The system includes a terminal that is configured to receive the modulated signal. The above arrangement is particularly applicable to providing multichannel multipoint distribution services (MMDS) over a radio communications system.

Claims

1. A method for communicating over a radio communications system, the method comprising:

encoding a signal using space-frequency coding;

modulating the encoded signal according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme; and

transmitting the modulated signal to a terminal using a plurality of multiple-input multiple-output (MIMO) transceivers.

2-30. -30. (canceled)