In a wireless MIMO communications device utilizing asymmetrical receivers

• US 9,621,194 B2
• Filed: 10/20/2015
• Issued: 04/11/2017
• Est. Priority Date: 07/24/2009
• Status: Active Grant

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Brisebois, Arthur Richard
• Primary Examiner(s): Tran, Khai
• Application Number:
  US14/918,187
• Publication Number:
  US 20160043748A1
• Time in Patent Office: 539 Days
• Field of Search: 375150, 375130, 375132, 375316, 375346, 375347, 370329, 370336
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/1036 with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters H04B1/123 takes precedence; filter circuits H03H
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0871 using different reception schemes, at least one of them being a diversity reception scheme
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 72/52 based on load

Abstract

Receivers in a mobile device are configured to mitigate receiver overload and fully or nearly-fully utilize available spectrum for communication. Configuration is dictated at least in part by at least one of radio link quality or available receiver specifications, and it can be affected by the mobile device or a base station that serves the mobile device. Receiver configuration includes various spectrally asymmetric receivers that tune respective disparate portions of the available spectrum to maximize utilization thereof in the spectral regions prone to overload conditions. In severe overload conditions, a single receiver can be configured to operate in a frequency band spectrally adjacent to a sub-band that leads to overload conditions when employed for telecommunication. To improve performance, the single receiver configuration can be supplemented with at least one of transmit diversity operation, asymmetric multicarrier spreading, or downlink power boost of asymmetrical multicarrier spreading.

Claims

1. A method, comprising:

in response to determining that channel state information of a first receiver of receivers of a wireless communication device satisfies a defined condition with respect to a decreased quality of a pilot signal associated with the first receiver, switching, by a system comprising a processor, an operation of the first receiver from a multiple-input multiple-output mode to a multiple-input single-output mode; and

in response to the switching, receiving, by the system using asymmetric multicarrier spreading, a communication via a first portion of an electromagnetic radiation spectrum of the communication using the first receiver and via a second portion of the electromagnetic radiation spectrum of the communication using a second receiver of the receivers.

2. The method of claim 1, wherein the defined condition relates to a degradation of the quality of the pilot signal.

3. The method of claim 1, wherein the determining comprises probing an overload condition associated with saturation of an amplifier of the first receiver.

4. The method of claim 3, wherein the probing the overload condition comprises determining the overload condition based on an overload criterion comprising channel state information threshold criteria that distinguish the overload condition from a non-overload condition.

5. The method of claim 1, further comprising:

scheduling, by the system based on the channel state information, a multiple-input multiple-output communication of the multiple-input multiple-output mode in response to a channel quality indicator of the first receiver being determined to be below a first level of channel quality and above a second level of channel quality, wherein the second level is lower than the first level.

6. The method of claim 3, wherein the second portion of the electromagnetic radiation spectrum is unaffected by the overload condition.

7. A system, comprising:

a processor; and

a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;

based on a quality of a pilot signal of a first receiver being determined to satisfy a defined condition, changing an operation of the first receiver from a multiple-input multiple-output communication mode to a multiple-input single-output communication mode; and

based on the changing the operation of the first receiver, receiving, utilizing asymmetric multicarrier spreading, a communication using a first portion of an electromagnetic spectrum of the communication via the first receiver and a second portion of the electromagnetic spectrum of the communication via a second receiver.

8. The system of claim 7, wherein the defined condition is associated with a degradation state of the quality of the pilot signal.

9. The system of claim 7, wherein the defined condition relates to a saturation of an amplifier of the first receiver.

10. The system of claim 9, wherein the defined condition represents an overload condition associated with the saturation of the amplifier.

11. The system of claim 10, wherein the second portion of the electromagnetic spectrum of the communication is unaffected by the overload condition.

12. The system of claim 10, wherein the operations further comprise:

determining the overload condition using an overload criterion that is based on a channel state information threshold that distinguishes the overload condition from a non-overload condition.

13. The system of claim 7, wherein the operations further comprise:

scheduling, based on the quality of the pilot signal, a multiple-input multiple-output communication of the multiple-input multiple output communication mode in response to a channel quality indicator of the first receiver being determined to be below a first level of channel quality and above a second level of channel quality, and wherein the second level is lower than the first level.

14. The system of claim 7, wherein the first portion of the electromagnetic spectrum comprises a wide band comprising a sub-band adjacent to a frequency block utilized for broadcast of a wireless signal, wherein the second portion of the electromagnetic spectrum comprises a narrow band that spectrally overlaps the wide band, and wherein the wide band is wider than the narrow band.

15. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:

in response to determining that a quality of a pilot signal of a first receiver satisfies a defined condition, changing an operation of the first receiver from a multiple-input multiple-output mode to a multiple-input single-output mode; and

in response to the changing, receiving a communication using asymmetric multicarrier spreading, wherein the receiving comprises receiving respective portions of an electromagnetic radiation spectrum of the communication using the first receiver and a second receiver.

16. The non-transitory machine-readable storage medium of claim 15, wherein the defined condition corresponds to an overload condition associated with saturation of an amplifier of the first receiver.

17. The non-transitory machine-readable storage medium of claim 16, wherein the operations further comprise:

determining the overload condition by evaluating an overload criterion that is based on channel state information thresholds that distinguish the overload condition from a non-overload condition.

18. The machine-readable storage medium of claim 16, wherein a portion of the respective portions of the electromagnetic radiation spectrum of the communication that has been received by the second receiver is unaffected by the overload condition.

19. The machine-readable storage medium of claim 15, wherein the operations further comprise:

scheduling, based on the quality of the pilot signal, a multiple-input multiple-output communication of the multiple-input multiple-output mode in response to a channel quality indicator of the first receiver being determined to be below a first level of channel quality and above a second level of channel quality, and wherein the second level is lower than the first level.

20. The machine-readable storage medium of claim 15, wherein the defined condition is associated with a degradation of the quality of the pilot signal.