METHOD AND SYSTEM FOR COMMUNICATIONS WITH REDUCED COMPLEXITY RECEIVERS

• US 20070243839A1
• Filed: 04/17/2006
• Published: 10/18/2007
• Est. Priority Date: 04/17/2006
• Status: Active Grant

• Current Assignee: Zoran Kostic
• Original Assignee: Zoran Kostic
• Inventors: Kostic, Zoran
• Granted Patent: US 7,564,910 B2
• Time in Patent Office: Days
• US Class Current: 455/132
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The invention provides a new method and system for low complexity, low cost, small component size, and low power communications. The system provides a digital sub-sampling receiver for multiple-antenna wireless receivers, with reduced number of analog RF/IF chains (or one chain) after a fixed number of receive antennas. The system provides a generator of transmit signals/sequences which are preconditioned by the operation of the system to compensate for spectral effects of ultra-low-rate sub-sampling, in that sequences preserve orthogonality under spectral repetition, spectral translation and spectral inversion. The system provides a management device to provide adaptation in transmit signals/waveforms/patterns as a function of channel and data source variations, such that communication data rates and capacities are maximized. The system can efficiently operate in multi-user multi-channel communication systems. The method implemented by the invention is split in its operation across the transmitter of the transmitting device and the receiver of the receiving device.

Claims

1. A method for processing data for transmission in a wireless multiple-antenna communication system with a plurality of terminal receivers, comprising:

a) generating one or more sequences; and

b) assigning each of said sequences to represent data to be transmitted to one of said plurality of terminal receivers;

whereby each sequence from the set of said sequences serves as an identifiable signature for data to be transmitted to one of said terminal receivers.

2. The method of claim 1, further comprising of:

a) mapping said assigned sequences to tone or frequency patterns to be used for modulation of said data to be transmitted to said terminal receivers; and

b) modulating said data to be transmitted to said terminal receivers using said tone or frequency patterns;

whereby said modulated data for said terminal receivers can be uniquely identified to be destined to a particular terminal receiver.

3. The method of claim 1, wherein generating of sequences is done such that sequences are self-orthogonal in their original form, and self-orthogonal in spectrally-translated form, and self-orthogonal in spectrally-inverted form.

4. The method of claim 1, wherein generating of sequences is done such that sequences are self-orthogonal and mutually orthogonal in their original form, and self-orthogonal and mutually orthogonal in spectrally-translated form, and self-orthogonal and mutually orthogonal in spectrally-inverted form.

5. The method of claim 2, wherein generating of said sequences is done such that said sequences are self-orthogonal in their original form, and self-orthogonal in spectrally-translated form, and self-orthogonal in spectrally-inverted form.

6. The method of claim 2, wherein generating said sequences is done such that said sequences are self-orthogonal and mutually orthogonal in their original form, and self-orthogonal and mutually orthogonal in spectrally-translated form, and self-orthogonal and mutually orthogonal in spectrally-inverted form.

7. The method of claim 2, wherein generating said sequences is done using Sub-Sampling Quadratic Congruence sequences.

8. The method of claim 6, wherein modulating said data is done using OFDM modulation.

9. The method of claim 2, further comprising:

a) collecting information from a plurality of terminals, regarding supported sampling rates, antenna numbers, analog receive chains

b) collecting channel information;

c) calculating optimal assignment of sub-sampling signals for modulating signals for individual terminals;

d) sending control information to terminals, over control channel, about assigned modulation format;

e) transmitting data to terminals;

f) iteratively adjusting transmission parameters;

whereby efficient communication is supported such that terminals can use reduced number of analog receive chains.

10. A method for processing received signals in a wireless communications receiver with multiple antennas, within a multi-user multi-channel communication system, comprising:

a) receiving a first plurality of analog received signals at each of a second plurality of antennas, thereby forming a second plurality of received analog signals;

b) sampling said second plurality of analog received signals with a re-sampling switch, thereby creating a third plurality of received signals;

c) propagating said third plurality of received signals thru a third plurality of analog receiver RF/IF chains;

d) converting from analog to digital said third plurality of received signals, to create a third plurality of digitally sampled received signals; and

e) demultiplexing said third plurality of digitally sampled received signals into a second plurality of digitally sampled received signals;

whereby said second plurality of digitally sampled received signals is a valid representation of every signal of said second plurality of received analog signals.

11. The method of claim 10, wherein said sampling is done such that said third plurality is equal in number to 1;

thereby said third plurality of received signals is equal to one received signal;

said third plurality of analog receiver RF/IF chains is equal to one analog receiver RF/IF chain; and

said third plurality of digitally sampled received signal is equal to one digitally sampled received signal.

12. The method of claim 10, wherein sampling of said second plurality of analog received signals with said re-sampling switch is performed at sampling rate below double the bandwidth of said multi-channel communications system.

13. The method of claim 12, further comprising:

a) receiving from a transmitter information about an assigned sequence that modulated the transmitted data for said receiver;

b) generating said assigned sequence, where said assigned sequence is self-orthogonal and mutually orthogonal to its family of sequences in its original form, and self-orthogonal and mutually orthogonal in spectrally-translated form, and self-orthogonal and mutually orthogonal in spectrally-inverted form;

c) mapping said assigned sequence to a tone or frequency pattern to be used for demodulation of data transmitted to said wireless receiver, from said second plurality of digitally sampled received signals; and

d) demodulating transmitted data from said second plurality of digitally sampled received using said tone or frequency pattern;

whereby said assigned sequences enables the extraction of data transmitted to said wireless receiver, from said second plurality of digitally sampled received signals polluted by spectral inversion and spectral translation caused by sub-sampling.

14. The method of claim 13, wherein generating said assigned sequence means generating a sequence that belongs to the family of Sub-Sampling Quadratic Congruence sequences.

15. 500 A wireless communications system using multiple antenna communications comprising a network, base stations, and terminals, all with multiple antennas, wherein the improvement comprises:

a) a database in a base station;

b) an information collection device in the base station connected to said memory, the information collecting device collecting information about terminal capabilities concerning hardware capabilities such as number of antennas, number of analog receive chains and power consumption targets, and also collecting channel quality information and data source rate requirements;

c) a generator of sequences in the base station, the generator capable of generating sequences that are self-orthogonal and mutually orthogonal in their original form, and self-orthogonal and mutually orthogonal in spectrally-translated form, and self-orthogonal and mutually orthogonal in spectrally-inverted form;

d) a resource management device in the base station, connected to the database, the resource management device managing the assignment of sequences in the transmitter of said base station for use to transmit signals to different terminals;

e) a first plurality of terminals, where each terminal comprises a second plurality of antennas, a sub-sampling switch, and a third plurality of analog receiver chains;

f) a resource management device, in all terminals, the resource management device capable of generating sequences that are self-orthogonal and mutually orthogonal in their original form, and self-orthogonal and mutually orthogonal in spectrally-translated form, and self-orthogonal and mutually orthogonal in spectrally-inverted form;

whereby said information collection device, said generator, and said management device are used to manage transmission of data to terminal receivers by modulating data using sequences generated by said generator, and said base station and said terminal use the same sequence for modulating data for communication.

16. The system of claim 15, wherein the generator in said base station can generate sub-sampling quadratic congruence sequences, and whereby the generator in said terminal can generate sub-sampling quadratic congruence sequences.

17. The system of claim 15, further comprising:

a) OFDM modulation device for modulating data using sequences generated in said generator.

18. The system of claim 15, wherein said information collection device, generator of sequences, and resource management device in said base station, are subservient to a network controller with its own resource assign manager, information collector and generator of sequences.