WAVEFORM MODULATED WIRELESS RURAL AREA NETWORK (WRAN) SYSTEMS AND MODULATION AND MULTIPLE ACCESS TECHNIQUES FOR WIRELESS COMMUNICATION SYSTEMS

• US 20080207119A1
• Filed: 02/28/2007
• Published: 08/28/2008
• Est. Priority Date: 11/06/2006
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Chang, Soo-Young
• Granted Patent: US 7,865,359 B2
• Time in Patent Office: Days
• US Class Current: 455/17
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0087 when data requirements change

Abstract

A method and system for transmitting data in a wireless network. The method includes generating a plurality of waveforms corresponding to a plurality of frequency subbands for a predetermined frequency band. The predetermined frequency band is divided into a plurality of groups of subbands, and the plurality of groups of subbands being divided into the plurality of frequency subbands. Additionally, the method includes receiving a data signal, processing information associated with the received data signal, modulating the plurality of waveforms based on at least information associated with the received data signal, and transmitting the modulated plurality of waveforms. Any two of the plurality of waveforms are substantially orthogonal to each other. Each of the plurality of waveforms corresponds to a waveform frequency spectrum associated with a spectral amplitude as a function of a frequency.

Claims

1. A method for transmitting data in a wireless network, the method comprising:

generating a plurality of waveforms corresponding to a plurality of frequency subbands for a predetermined frequency band, the predetermined frequency band being divided into a plurality of groups of subbands, the plurality of groups of subbands being divided into the plurality of frequency subbands;

receiving a data signal;

processing information associated with the received data signal;

modulating the plurality of waveforms based on at least information associated with the received data signal;

transmitting the modulated plurality of waveforms;

wherein;

any two of the plurality of waveforms are substantially orthogonal to each other;

each of the plurality of waveforms corresponds to a waveform frequency spectrum associated with a spectral amplitude as a function of a frequency;

the spectral amplitude for the frequency spectrum equals substantially zero outside a frequency subband selected from the plurality of frequency subbands, and equals substantially a constant number within the frequency subband.

2. The method of claim 1 wherein:

the each of the plurality of waveforms corresponds to only the frequency subband;

the frequency subband corresponds to only the each of the plurality of waveforms.

3. The method of claim 1 wherein:

the predetermined frequency band corresponds to a first bandwidth;

each of the plurality of groups of subbands corresponds to a same second bandwidth;

each of the plurality of frequency subbands corresponds to a same third bandwidth.

4. The method of claim 3 wherein:

the first bandwidth is equal to the second bandwidth multiplied by the number of groups for the plurality of groups of subbands;

the first bandwidth is equal to the third bandwidth multiplied by the number of subbands for the plurality of frequency subbands.

5. The method of claim 1 wherein the predetermined band is a TV channelband.

6. The method of claim 1 wherein:

the generating a plurality of waveforms includes generating the each of the plurality of waveforms;

the generating the each of the plurality of waveforms includes;

generating a first waveform in a time domain;

modifying the first waveform in the time domain;

determining a first frequency spectrum based on at least information associated with the modified first waveform;

modifying the first frequency spectrum;

determining a second waveform in the time domain based on at least information associated with the modified first frequency spectrum;

modifying the second waveform in the time domain;

determining a second frequency spectrum based on at least information associated with the modified second waveform;

processing information associated with the second frequency spectrum;

determining whether the second frequency spectrum satisfies one or more predetermined conditions.

7. The method of claim 6 wherein the generating the each of the plurality of waveforms further includes:

if the second frequency spectrum is determined not to satisfy the one or more predetermined conditions,

modifying the second frequency spectrum;

determining a third waveform in the time domain based on at least information associated with the modified second frequency spectrum;

modifying the third waveform in the time domain;

determining a third frequency spectrum based on at least information associated with the modified third waveform;

processing information associated with the third frequency spectrum;

determining whether the third frequency spectrum satisfies the one or more predetermined conditions.

8. The method of claim 6 wherein the generating the each of the plurality of waveforms further includes, if the second frequency spectrum is determined to satisfy the one or more predetermined conditions, determining that the second waveform is the each of the plurality of waveforms.

9. The method of claim 6 wherein:

the first frequency spectrum is associated with a first amplitude;

the modifying the first frequency spectrum includes;

within the frequency subband, if the first amplitude is larger than a predetermined value, setting the first amplitude to the predetermined value;

outside the frequency subband, if the first amplitude is larger than zero, setting the first amplitude to zero.

10. The method of claim 6 wherein:

the first waveform is associated with a second amplitude in the time domain;

the modifying the first waveform in the time domain includes, outside a predetermined time period, if the second amplitude is larger than zero in magnitude, setting the second amplitude to zero.

11. The method of claim 6 wherein:

the second waveform is associated with a third amplitude in the time domain;

the modifying the second waveform in the time domain includes, outside a predetermined time period, if the third amplitude is larger than zero in magnitude, setting the third amplitude to zero.

12. The method of claim 6 wherein:

the second frequency spectrum is associated with a fourth amplitude in the frequency domain;

the determining whether the second frequency spectrum satisfies one or more predetermined conditions includes, if the fourth amplitude is substantially equal to or smaller than a predetermined value within the frequency subband and if the fourth amplitude is substantially equal to zero in magnitude outside the frequency subband, determining the second frequency spectrum satisfies the one or more predetermined conditions.

13. The method of claim 1 wherein the modulating the plurality of waveforms includes modulating each of the plurality of waveforms based on at least one selected from a group consisting of an OOK scheme, an antipodal BPSK scheme, an OOK and antipodal BPSK scheme, and an n-level modulation and nQAM scheme.

14. The method of claim 1 wherein:

the data signal includes at least a first plurality of data from a first user and a second plurality of data from a second user;

transmitting the modulated plurality of waveforms includes transmitting, in parallel, the first plurality of data from the first user and the second plurality of data from the second user.

15. The method of claim 14 wherein the transmitting, in parallel, the first plurality of data from the first user and the second plurality of data from the second user includes:

transmitting, in parallel, the first plurality of data from the first user using at least in part each of the plurality of groups of subbands;

transmitting, in parallel, the second plurality of data from the second user using at least in part each of the plurality of groups of subbands.

16. The method of claim 14 wherein the transmitting, in parallel, the first plurality of data from the first user and the second plurality of data from the second user includes:

transmitting, in parallel, the first plurality of data from the first user using a first group only selected from the plurality of groups of subbands;

transmitting, in parallel, the second plurality of data from the second user using a second group only selected from the plurality of groups of subbands;

the first group and the second group are different.

17. The method of claim 1 wherein:

the data signal includes a plurality of data from a user and does not include any date from any other user;

transmitting the modulated plurality of waveforms includes transmitting, in parallel, the plurality of data from the user using all groups of the plurality of groups of subbands.

18. A system for transmitting data in a wireless network, the system comprising:

a data processing component configured to receive a data signal;

a serial-to-parallel converter coupled to the data processing component;

a plurality of waveform generation and modulation components coupled to the serial-to-parallel converter and configured to generate a first plurality of waveforms and modulate the first plurality of waveforms based on at least information associated with the data signal, the first plurality of waveforms corresponding to a first plurality of frequency subbands for a predetermined band, the predetermined band being divided into a plurality of groups of subbands, the plurality of groups of subbands being divided into the first plurality of frequency subbands;

a combination component configured to receive the modulated first plurality of waveforms and generate a combined waveform signal based on at least information associated with the modulated first plurality of waveforms;

an antenna configured to transmit the combined waveform;

wherein;

any two of the first plurality of waveforms are substantially orthogonal to each other;

each of the first plurality of waveforms corresponds to a waveform frequency spectrum associated with a spectral amplitude as a function of a frequency;

the spectral amplitude for the frequency spectrum equals substantially zero outside a frequency subband selected from the plurality of frequency subbands, and equals substantially a constant number within the frequency subband.

19. The system of claim 18 wherein:

the first plurality of waveforms includes at least a second plurality of waveforms and a third plurality of waveforms;

the plurality of groups of subbands includes at least a first group of subbands and a second group of subbands;

a plurality of waveform generation and modulation components includes at least a first waveform generation and modulation component and a second waveform generation and modulation component;

the first waveform generation and modulation component is configured to generate and modulate the first plurality of waveforms corresponding to the first group of subbands;

the second waveform generation and modulation component is configured to generate and modulate the second plurality of waveforms corresponding to the second group of subbands.

20. The system of claim 19 wherein the first waveform generation and modulation component comprises:

a digital waveform generation and modulation unit;

a plurality of digital-to-analog converters coupled to the digital waveform generation and modulation unit;

a clock signal generator configured to provide a plurality of clock signals to the plurality of digital-to-analog converters respectively;

wherein;

the plurality of clock signals includes at least a first clock signal and a second clock signal

the first clock signal and the second clock signal are offset from each other by a predetermined time period.

21. The system of claim 19 wherein the first waveform generation and modulation component comprises:

a digital waveform generation and modulation unit;

a plurality of digital-to-analog converters coupled to the digital waveform generation and modulation unit;

a plurality of delay components coupled to the plurality of digital-to-analog converters respectively;

wherein;

the plurality of digital-to-analog converters includes a first digital-to-analog converter for outputting a first analog signal and a second digital-to-analog converter for outputting a second analog signal;

the plurality of delay components includes at least a first delay component configured to perform a first delay to the first analog signal and a second delay component configured to perform a second delay to the second analog signal;

the first delay and the second delay are different in magnitude.

22. The system of claim 21 wherein the plurality of delay components are digital logic gates.

23. The system of claim 21 wherein the plurality of delay components are delay lines.

24. A method for receiving data in a wireless network, the method comprising:

receiving a signal including a first plurality of modulated waveforms, the first plurality of modulated waveforms corresponding to a plurality of frequency subbands respectively for a predetermined frequency band, the predetermined frequency band being divided into a plurality of groups of subbands, the plurality of groups of subbands being divided into the plurality of frequency subbands;

generating a second plurality of base waveforms corresponding to the plurality of frequency subbands respectively;

processing information associated with the first plurality of modulated waveforms and the second plurality of base waveforms;

determining data carried by the first plurality of modulated waveforms based on at least information associated with the first plurality of modulated waveforms and the second plurality of base waveforms;

wherein;

any two of the second plurality of base waveforms are substantially orthogonal to each other;

each of the second plurality of base waveforms corresponds to a waveform frequency spectrum associated with a spectral amplitude as a function of a frequency;

the spectral amplitude for the frequency spectrum equals substantially zero outside a frequency subband selected from the plurality of frequency subbands, and equals substantially a constant number within the frequency subband.

25. A system for receiving data in a wireless network, the system comprising:

an antenna configured to receive a combined waveform;

a processing component configured to receive the combined waveform and generate a first plurality of modulated waveforms;

a plurality of waveform generation and correlation components coupled to the processing component and configured to generate a second plurality of base waveforms and determine data carried by the first plurality of modulated waveforms based on at least information associated with the first plurality of modulated waveforms and the second plurality of base waveforms, the second plurality of base waveforms corresponding to a plurality of frequency subbands respectively for a predetermined frequency band, the predetermined frequency band being divided into a plurality of groups of subbands, the plurality of groups of subbands being divided into the plurality of frequency subbands;

wherein;

any two of the second plurality of base waveforms are substantially orthogonal to each other;

each of the second plurality of base waveforms corresponds to a waveform frequency spectrum associated with a spectral amplitude as a function of a frequency;

the spectral amplitude for the frequency spectrum equals substantially zero outside a frequency subband selected from the plurality of frequency subbands, and equals substantially a constant number within the frequency subband.