System and method for utilizing spectral resources in wireless communications

• US 8,411,766 B2
• Filed: 04/09/2008
• Issued: 04/02/2013
• Est. Priority Date: 04/09/2008
• Status: Active Grant

• Current Assignee: Taiwan Semiconductor Manufacturing Company Limited
• Original Assignee: Quarterhill Inc. (f/k/a Wi-LAN Inc.)
• Inventors: Wu, Shiquan, Yee, Jung
• Primary Examiner(s): Singh, Hirdepal
• Application Number:
  US12/078,979
• Publication Number:
  US 20090257480A1
• Time in Patent Office: 1,819 Days
• Field of Search: 375/135, 375/136, 375/219, 375/259, 375/260, 375/261, 375/271, 375/295, 375/298, 375/302, 375/316, 375/322, 375/324, 375/343, 375/344
• US Class Current: 375/260
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A wireless communication system comprises a wavelet analyzer and a wavelet signal generator. The wavelet analyzer is operable to analyze wireless signals within a frequency and time map of a communications spectrum, whereby the wavelet analyzer is adapted to determine one or more available cells within the frequency and time map. The wavelet signal generator is operable to generate one or more wavelet signals for transmission within the determined one or more available cells of the frequency and time map based on the analyzed wireless signals within the frequency and time map.

Claims

1. A wireless communication system comprising:

a wavelet analyzer operable to analyze wireless signals within a frequency and time map of a communications spectrum, the wavelet analyzer adapted to determine one or more available cells within the frequency and time map;

a wavelet signal generator operable to generate one or more wavelet signals for transmission within the determined one or more available cells of the frequency and time map based on the analyzed wireless signals;

a transmitter including a modulator operable to modulate the one or more wavelet signals with data, a digital-to-analog converter operable to convert the modulated one or more wavelet signals from a digital format to an analog format, an amplifier operable to amplify the one or more wavelet signals that are in analog format, and an antenna operable to radiate the one or more wavelet signals that are amplified; and

an error correction unit operable to encode the data prior to modulation of the one or more wavelet signals.

2. The system according to claim 1, further comprising a band pass filter operable to filter the one or more wavelet signals that are amplified.

3. The system according to claim 1, further comprising an up converter operable to shift the one or more wavelet signals in analog format from an intermediate microwave frequency to a millimeter wave carrier frequency prior to amplification by the power amplifier.

4. The system according to claim 1, wherein the data comprises one of the group consisting of binary phase shift key (BPSK) data, phase shift key (PSK) data, quadrature phase shift key (QPSK) data, and quadrature amplitude modulation (QAM) data.

5. The system according to claim 1, further comprising a receiver including:

an antenna operable to receive the wireless signals; and

an amplifier operable to amplify the received wireless signals.

6. The system according to claim 5, further comprising a band pass filter operable to filter the received wireless signals.

7. The system according to claim 5, further comprising a down converter operable to shift the amplified wireless signals from a millimeter wave carrier frequency to an intermediate microwave frequency.

8. The system of claim 1, wherein the transmitter is operable to communicate wavelet information associated with the one or more available cells to an intended receiver over a fixed frequency control channel.

9. The system of claim 1, wherein the wavelet signal generator is further operable to generate daughter wavelets from a selected mother wavelet, wherein the wavelet signal generator generates one or more daughter wavelets for transmitting data information within the determined one or more available cells.

10. The system according to claim 1, further comprising a memory operable to store mother wavelets associated with each cell within the frequency and time map.

11. A wireless communication system comprising:

a receiver portion operable to receive wireless signals associated with a frequency and time map within a communications spectrum, wherein using wavelet analysis the receiver portion is adapted to analyze the wireless signals for determining one or more available cells within the frequency and time map;

a transmitter portion coupled to the receiver and operable to modulate one or more wavelet signals with data for transmission within the determined one or more available cells of the frequency and time map, the transmitter portion including

a modulator operable to modulate the one or more wavelet signals with data, a digital-to-analog converter operable to convert the modulated one or more wavelet signals from a digital format to an analog format, an amplifier operable to amplify the one or more wavelet signals that are in analog format, and an antenna operable to radiate the one or more wavelet signals that are amplified; and

an error correction unit operable to encode the data prior to modulation of the one or more wavelet signals.

12. The system according to claim 11, wherein the receiver portion comprises a wavelet analyzer operable to analyze the wireless signals.

13. The system according to claim 12, wherein the transmitter portion comprises a wavelet generator operable to generate one or more modulated wavelet signals based on the analyzed wireless signals.

14. The system of claim 11, wherein the transmitter portion is further operable to communicate wavelet information associated with the one or more available cells to an intended receiver over a fixed frequency control channel.

15. The system of claim 11, wherein the one or more wavelet signals are daughter wavelets generated from a selected mother wavelet.

16. The system of claim 11, further comprising a memory operable to store mother wavelets associated with each cell within the frequency and time map.

19. The device of claim 11, further comprising a fourth module operable to communicate the one or more wavelet signals to an intended receiver over a fixed frequency control channel.

20. The device of claim 11, wherein the one or more wavelet signals are daughter wavelets generated from a selected mother wavelet.

21. The device of claim 11, further comprising a memory operable to store mother wavelets associated with each cell within the frequency and time map.

17. A wavelet signal generation device for wireless transmission, comprising:

an analog to digital converter device operable to convert received wireless signals into digitized signals; and

a digital signal processor device operable to perform wavelet analysis on the digitized signals for determining one or more available cells within a frequency and time map of a communications spectrum, wherein the digital signal processor device generates one or more wavelet signals for transmission within the determined one or more available cells within the frequency and time map of the communications spectrum;

the digital signal processor device comprising

a first module operable to calculate wavelet coefficients for each of the digitized signals,

a second module operable to calculate a magnitude value for each of the digitized signals based on the wavelet coefficients, wherein the magnitude value for each of the digitized signals is compared to a threshold value for determining the one or more available portions of the communications spectrum, and

a third module operable to select the one or more wavelet signals for transmission within the determined one or more available portions of the communications spectrum, wherein upon selection, the third module combines data information with the one or more wavelet signals.

18. The device according to claim 17, wherein the digital signal processor comprises a programmable device programmed to include the first, the second, and the third module.