Signal conversion apparatus, systems, and methods

• US 7,702,049 B2
• Filed: 09/30/2003
• Issued: 04/20/2010
• Est. Priority Date: 09/30/2003
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Li, Qinghua, Tsui, Ernest
• Primary Examiner(s): Wang; Ted M
• Application Number:
  US10/677,058
• Publication Number:
  US 20050069046A1
• Time in Patent Office: 2,394 Days
• Field of Search: 375/347, 375/316, 375/340, 375/346
• US Class Current: 375/347
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

An apparatus and a system, as well as a method and article, may operate to shift a center frequency of selected ones of a plurality of received signals by selected amounts to provide a plurality of shifted signals located in a frequency domain, which may then be combined into a composite signal centered at a selected frequency.

Claims

1. A method, comprising:

shifting a center frequency of selected ones of a plurality of received signals by selected amounts to provide a plurality of shifted signals located in a frequency domain;

combining the plurality of shifted signals into a composite signal centered at a selected frequency, the selected frequency being approximately zero cycles-per-second;

sampling the composite signal with a single analog-to-digital converter to provide a multiplicity of digital samples;

providing the multiplicity of digital samples to a plurality of digital bandpass filters; and

canceling interference present in the composite signal, wherein canceling the interference present in the composite signal further comprises reconstructing the interference present in the composite signal.

2. The method of claim 1, wherein the plurality of shifted signals are located substantially sequentially in the frequency domain.

3. The method of claim 1, further comprising:

converting the composite signal into a plurality of digital signals.

4. The method of claim 3, further comprising:

receiving the plurality of digital signals at an interference canceller.

5. The method of claim 1, wherein at least one of the plurality of digital bandpass filters provides a series of digital channel samples, further comprising:

providing the series of digital channel samples to a down converter.

6. The method of claim 1, wherein the plurality of received signals comprises a plurality of baseband analog signals.

7. An article comprising a machine-accessible medium having associated data, wherein the data, when accessed, results in a machine performing:

shifting a center frequency of selected ones of a plurality of received signals by a selected amount to provide a plurality of shifted signals located in a frequency domain;

combining the plurality of shifted signals into a composite signal centered at a selected frequency, the selected frequency being approximately zero cycles-per-second;

sampling the composite signal with a single analog-to-digital converter to provide a multiplicity of digital samples;

providing the multiplicity of digital samples to a plurality of digital bandpass filters, wherein the composite signal includes a plurality of protocols associated with the plurality of received signals; and

canceling interference present in the composite signal, wherein canceling the interference present in the composite signal further comprises reconstructing the interference present in the composite signal.

8. The article of claim 7, wherein the composite signal includes a plurality of signals from a plurality of antennas.

9. The article of claim 7, wherein the data, when accessed, results in the machine performing:

selecting a single sampling frequency rate for the composite signal; and

determining a down conversion frequency for selected radio frequency signals associated with the plurality of received signals.

10. The article of claim 7, wherein the plurality of shifted signals are located substantially sequentially in the frequency domain.

11. An apparatus, comprising:

a single analog-to-digital converter to sample a composite signal and to provide a multiplicity of digital samples, the composite signal being centered at a selected frequency of approximately zero cycles-per-second;

a plurality of digital bandpass filters to couple to the analog-to-digital converter and to receive the multiplicity of digital samples;

an analog stage to couple to the analog-to-digital converter, wherein the analog stage is to shift a center frequency of a plurality of received signals by a selected amount to provide a plurality of shifted signals for combination into the composite signal, and wherein the composite signal includes a plurality of protocols associated with the plurality of received signals; and

an active channel controller to couple to the analog-to-digital converter, wherein the active channel controller is to determine a down conversion frequency according to an activity status of a selected section included in a plurality of sections corresponding to the plurality of received signals.

12. The apparatus of claim 11, wherein the analog stage further comprises:

a plurality of sections corresponding to the plurality of received signals, wherein selected ones of the sections include at least one bandpass filter and a mixer.

13. The apparatus of claim 11, wherein the analog stage further comprises:

a combiner selected from a power combiner, a mixer, and an adder.

14. The apparatus of claim 11, further comprising:

an interference canceller to couple to the analog-to-digital converter.

15. The apparatus of claim 11, further comprising:

a plurality of digital processing modules corresponding to the plurality of received signals, wherein selected ones of the digital processing modules include at least one of the digital bandpass filters and a down converter.

16. The apparatus of claim 11, wherein

the active channel controller is to adjust a sampling rate associated with the analog-to-digital converter.

17. A system, comprising:

a single analog-to-digital converter to sample a composite signal and to provide a multiplicity of digital samples, the composite signal being centered at a selected frequency of approximately zero cycles-per-second;

a plurality of digital bandpass filters to couple to the analog-to-digital converter and to receive the multiplicity of digital samples;

an analog stage to couple to the analog-to-digital converter, wherein the analog stage is to shift a center frequency of a plurality of received signals by a selected amount to provide a plurality of shifted signals for combination into the composite signal;

an omnidirectional antenna to couple to the analog stage; and

an active channel controller to couple to the analog-to-digital converter, wherein the active channel controller is to determine a down conversion frequency according to an activity status of a selected section included in a plurality of sections corresponding to the plurality of received signals.

18. The system of claim 17, further comprising:

an interference canceller to couple to the analog-to-digital converter.

19. The system of claim 17, wherein the active channel controller is to select a channel included in the composite signal corresponding to a selected protocol.