HIGH DATA RATE CLOSED LOOP MIMO SCHEME COMBINING TRANSMIT DIVERSITY AND DATA MULTIPLEXING

• US 20110080976A1
• Filed: 12/16/2010
• Published: 04/07/2011
• Est. Priority Date: 11/21/2001
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Dabak, Anand G., Schmidl, Timothy M., Onggosanusi, Eko
• Granted Patent: US 8,139,678 B2
• Time in Patent Office: Days
• US Class Current: 375/299
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Abstract

Closed loop multiple-antenna wireless communications system with antenna weights determined by maximizing a composite channel signal-to-interference-plus-noise ratio minimum. Multiplexed symbol streams over subsets of antennas enhance throughout.

Claims

1. A wireless transmitter comprising:

A. symbol mapping circuitry having a data symbol output;

B. serial to parallel circuitry having an input coupled with the data symbol output and having plural symbol stream outputs;

C. multiplier circuits, one for each symbol stream output, each multiplier circuit having a symbol input, an antenna weight input, and an antenna output, the symbol input being coupled with a symbol stream output;

D. antenna units, each coupled with the antenna output of one multiplier circuit; and

E. antenna weight circuitry having plural antenna weight outputs, each antenna weight output being coupled with one antenna weight input, the antenna weight circuitry producing weight signals on the antenna weight outputs in accordance with a matrix V, where

2. The wireless transmitter of claim 1 in which for M=2:

3. The wireless transmitter of claim 1 in which the transmitter is included in user equipment.

4. The wireless transmitter of claim 1 in which the transmitter is included in a mobile device.