APPARATUS FOR ANTENNA DIVERSITY USING JOINT MAXIMAL RATIO COMBINING

• US 20090239486A1
• Filed: 06/09/2009
• Published: 09/24/2009
• Est. Priority Date: 03/01/2002
• Status: Abandoned Application

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Inventors: Vaidyanathan, Chandra, Sugar, Gary L., Tesfai, Yohannes
• Application Number:
  US12/481,385
• Publication Number:
  US 20090239486A1
• Time in Patent Office: Days
• US Class Current: 455/101
• CPC Class Codes: H01Q 3/28 varying the amplitude
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H03G 3/3089 Control of digital or coded signals
• CPC Class Codes: H04B 1/0483 Transmitters with multiple parallel paths
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0845 per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch rake receivers as such H04B1/7115
• CPC Class Codes: H04B 7/0848 Joint weighting
• 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]
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 2025/03611 Iterative algorithms
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/0242 using matrix methods
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/2602 : Signal structure
• CPC Class Codes: H04L 27/2626 : Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/0007 : the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 52/42 : in systems with time, space, frequency or polarisation diversity

Abstract

A method for improving performance of radio frequency (RF) communication of a station (STA) having an access point (AP) is disclosed. The method includes using an arbitrary set of transmit antenna weights, calculating a set of receive antenna weights, and updating the transmit antenna weights based on the receive antenna weights.

Claims

1. A method for improving performance of radio frequency (RF) communication of a station (STA) having an access point (AP), the method comprising:

transmitting a transmit antenna weight vector using a complex transmit antenna weight vector for each of a plurality of N antennas, wherein each complex transmit antenna weight has a magnitude and a phase whose values may vary with frequency;

calculating a receive antenna weight vector comprising a plurality of complex receive antenna weights for the N plurality of antennas; and

updating the transmit antenna weight vector for the plurality of N antennas based on a computed conjugate of the received antenna weight vector and a norm of the receive antenna weight vector.

2. The method as in claim 1, wherein the transmit weight vector and the receive antenna weight vector converge to values that optimize the signal-to noise-ratio (SNR) of the STA.

3. The method as in claim 1, wherein the receive antenna weights are computed from a matrix multiplication of an arbitrary set of transmit antenna weights and a channel response matrix.

4. The method as in claim 2, further comprising storing in a memory the optimized SNR value.

5. The method as in claim 4, wherein the optimized SNR value is stored in a look-up-table.