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

• US 20100040172A1
• Filed: 10/21/2009
• Published: 02/18/2010
• Est. Priority Date: 11/21/2001
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Texas Instruments, Inc.
• Inventors: Onggosanusi, Eko N., Dabak, Anand G., Schmidl, Timothy M.
• Granted Patent: US 7,876,854 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 an 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 an symbol input coupled with a symbol stream output, an antenna weight input, and an output;

D. antenna units, each coupled with the 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 rectangular matrix that corresponds to a diagonal M×

M block matrix of (P/M)×

1 vectors, where each (P/M)×

1 vector corresponds to weights for each symbol stream.

2. The transmitter of claim 1 in which each antenna unit P has two antennas.

3. The transmitter of claim 1 in which the serial to parallel circuitry has M symbol stream outputs s_m.

4. The transmitter of claim 1 in which each antenna weight is a 2×

1 weighting vector w_m corresponding to a symbol stream output.

5. The transmitter of claim 1 in which each antenna weight is a vector w_m corresponding to a symbol stream output, and in which the antenna weight circuitry provides weight signals in accordance with a weighting matrix V, where:

$V<br><br>\begin{array}{cccc}{w}_1& 0& \mathrm{\dots <br><br>}& 0\\ 0& w_2& \mathrm{\dots <br><br>}& 0\\ \mathrm{⋮<br><br>}& \mathrm{⋮<br><br>}& \mathrm{⋮<br><br>}& \mathrm{⋮<br><br>}\\ 0& 0& \mathrm{\dots <br><br>}& w_m\end{array}$

where each vector w_m belongs to a set of (P/M)×

1 vectors.

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

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