MIMO Phone

• US 8,155,613 B2
• Filed: 01/04/2011
• Issued: 04/10/2012
• Est. Priority Date: 10/06/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kent, Mark, Erceg, Vinko, Landau, Uri M., van Rooyen, Pieter
• Primary Examiner(s): Doan, Phuoc
• Application Number:
  US12/984,089
• Publication Number:
  US 20110098082A1
• Time in Patent Office: 462 Days
• Field of Search: 455/276.1, 375/131, 370/338
• US Class Current: 455/276.1
• CPC Class Codes: H04B 7/084 Equal gain combining, only phase adjustments antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays

Abstract

In a RF communications system, aspects for single weight antenna system for HSDPA may comprise receiving HSDPA signals via a plurality of receive antennas and individually adjusting a phase of a portion of the received HSDPA signals via a single weight. The phase adjusted portion of the received HSDPA signals may be combined with at least one of the received HSDPA signals to generate combined HSDPA signals. At least one control signal may control the adjusting of the phase of the received HSDPA signals. Discrete phases may be communicated to adjust the phase of the portion of the received HSDPA signals, where the plurality of the discrete phases may range from zero radians to substantially 2π radians. Phase shift channel estimates may be generated during the identified time to determine the discrete phase. A desired phase may be generated from the phase shift channel estimates, and the single weight may be generated from the desired phase.

Claims

1. A MIMO phone having at least a first antenna and a second antenna, comprising:

a first bandpass filter operatively coupled to a first low noise amplifier, wherein the first bandpass filter is operatively disposed between the first low noise amplifier and the first antenna;

a second bandpass filter operatively coupled to a second low noise amplifier, wherein the second bandpass filter is operatively disposed between the second low noise amplifier and the second antenna;

a phase shift adjuster operatively coupled to an RF combiner, wherein the phase shift adjuster is operatively disposed between the RF combiner and the second low noise amplifier, wherein the RF combiner combines a first RF analog signal output from the first low noise amplifier and a second RF analog signal output from the phase shift adjuster;

a first processor operatively coupled to the RF combiner, wherein the first processor is configured to track time-wise clusters of multipath signals and to estimate a complex phase or an amplitude of the multipath signals in the signal clusters; and

a baseband weight generator that receives information from the first processor and generates a phase control signal to the phase shift adjuster.

2. The MIMO phone according to claim 1, wherein the MIMO phone supports HSDPA.

3. The MIMO phone according to claim 2, wherein the HSDPA co-exists on a same carrier as WCDMA and UMTS services.

4. The MIMO phone according to claim 1, wherein the MIMO phone supports one or more of the following:

adaptive modulation, adaptive coding, multicode operation and retransmission strategies.

5. The MIMO phone according to claim 1, comprising:

a chip matched filter operatively coupled to the first processor,

wherein the chip matched filter comprises a plurality of digital filters for an in-phase component and a quadrature component of a baseband signal.

6. The MIMO phone according to claim 5, wherein the chip matched filter is configured to digitally filter the baseband filter for a WCDMA baseband bandwidth.

7. The MIMO phone according to claim 1, wherein the phase shift adjuster is configured to adjust a phase of a signal received from the second low noise amplifier in discrete increments.

8. The MIMO phone according to claim 7, wherein the discrete increments are integer multiples of a minimum phase change.

9. The MIMO phone according to claim 1, wherein the phase shift adjuster comprises one or more of the following:

a digital-to-analog converter and a conversion table.

10. The MIMO phone according to claim 9, wherein the phase shift adjuster uses the conversion table to convert a pair of numeric values into a numeric phase.

11. The MIMO phone according to claim 1, wherein the baseband weight generator comprises a phase rotator and a lookup table, wherein the lookup table provides the phase control signal to the phase shift adjuster.

12. The MIMO phone according to claim 1, comprising a second processor operatively coupled to the baseband weight generator, wherein the second processor monitors or controls particular functionalities of the MIMO phone.

13. The MIMO phone according to claim 12, wherein the first processor generates a measured channel response, and wherein the second processor monitors a rate of change in the measured channel response to estimate a moving speed of the MIMO phone.

14. The MIMO phone according to claim 13, wherein the second processor determines how often the baseband weight generator provides a new phase control signal to the phase shift adjuster based on the estimated moving speed of the MIMO phone.

15. The MIMO phone according to claim 1, comprising RF circuitry operatively coupled to the RF combiner, wherein the RF circuitry is operatively disposed between the RF combiner and the processor.

16. The MIMO phone according to claim 15, wherein the RF circuitry is configured to amplify, to filter and to convert a combined RF signal received from the RF combiner into a combined baseband signal.

17. The MIMO phone according to claim 1, wherein the first bandpass filter, the second bandpass filter, the first low noise amplifier, the second bandpass filter, the phase shift adjuster and the RF combiner are part of a MIMO receiver.

18. The MIMO phone according to claim 1, wherein the MIMO phone supports one or more of the following:

WCDMA, GPRS, EDGE and UMTS.

19. The MIMO phone according to claim 1, wherein the MIMO phone supports Layer 1 HARQ control.

20. The MIMO phone according to claim 1, wherein the MIMO phone supports using up to ten multicodes.