Methods and systems for transmitting an information signal in a multiple antenna communication system
View Patent ↗Methods and systems are provided for transmitting a plurality of information signals in a multiple antenna communication system. One or more information signals are coded using a plurality of coders to generate the plurality of coded information signals and an Inverse Fast Fourier Transformation is performed on each of the plurality of coded information signals to create a corresponding output signal. Each of the corresponding output signals are transmitted on a different antenna. Each of the plurality of coded information signals can optionally be separated into K signals. On the receiver side, a signal comprising K different frequencies is received on at least N receive antennas and a Fast Fourier Transformation is applied to each of the at least N received versions of the signal comprising K different frequencies to generate N*K low frequency signals. The N*K separate low frequency signals are then combined to recover a transmitted information signal, based on one or more transfer functions from each of a plurality of transmit antennas to each of the N receive antennas.
1. A method for transmitting an information signal in a multiple antenna
communication system, comprising the steps of:
separating said information signal into K signals;
performing an Inverse Fast Fourier Transformation on said K signals to generate a signal comprising K different frequencies; and
transmitting said signal comprising K different frequencies on only one antenna.
2. The method of claim 1 , wherein said signal comprising K different frequencies has a lower information rate than said information signal.
3. The method of claim 1 , wherein a receiver processes a received version of said signal comprising K different frequencies based on transfer functions from each of a plurality of transmit antennas to each of a plurality of receive antennas.
4. The method of claim 3 , wherein said transfer functions are determined by a geometry of a configuration of the multiple antenna communication system, wherein each of said transfer functions is associated with a different travel-path between an antenna of a first set of transmitters and an antenna of a receiver.
5. The method of claim 3 , wherein said transfer functions are expressed as a complex number, wherein an amplitude of one of said complex numbers is an attenuation of a strength of a signal and wherein a phase of one of said complex numbers is a phase modulation incurred during transmission along a travel path.
6. The method of claim 1 , further comprising the step of cyclically extending a symbol interval with a guard interval that is larger than an associated delay spread.
7. The method of claim 1 , wherein said communication system is an OFDM communication system.
8. The method of claim 1 , wherein said separating step is performed by a serial-to-parallel converter.
9. The method of claim 1 , further comprising the step of applying a Forward Error Correction to said information signal.
10. A method for receiving a signal comprising K different frequencies on at least N of antennas in a multiple antenna communication system, comprising the steps of:
receiving said signal comprising K different frequencies on said at least N receive antennas, where N is greater than one;
applying a Fast Fourier Transformation to each of said at least N received versions of said signal comprising K different frequencies to generate N*K low frequency signals; and
combining said N*K separate low frequency signals to recover a transmitted information signal, based on one or more transfer functions from each of a plurality of transmit antennas to each of said N receive antennas.
11. The method of claim 10 , wherein said combining step further comprises the steps of a least squares estimation and parallel to serial conversion.
12. The method of claim 10 , wherein said signal comprising K different frequencies has a lower information rate than said information signal.
13. The method of claim 10 , wherein said transfer functions are determined by a geometry of a configuration of the multiple antenna communication system, wherein each of said transfer functions is associated with a different travel-path between an antenna of a first set of transmitters and an antenna of a receiver.
14. The method of claim 10 , wherein said transfer functions are expressed as a complex number, wherein an amplitude of one of said complex numbers is an attenuation of a strength of a signal and wherein a phase of one of said complex numbers is a phase modulation incurred during transmission along a travel path.
15. The method of claim 10 , wherein said communication system is an OFDM communication system.
16. The method of claim 10 , wherein a number of antennas in a transmitter is different than said number N of receive antennas.
17. A mobile station for transmitting an information signal in a multiple antenna communication system, comprising the steps of:
a serial-to-parallel unit for separating said information signal into K signals;
an Inverse Fast Fourier Transformation stage for generating a signal comprising K different frequencies based on said K signals; and
an antenna for transmitting said signal comprising K different frequencies, wherein said signal comprising K different frequencies is transmitted on only one antenna.
18. The mobile station of claim 17 , wherein a receiver processes a received version of one or more of said corresponding output signals based on transfer functions from each of a plurality of transmit antennas to each of a plurality of receive antennas.
19. The mobile station of claim 17 , wherein said communication system is an OFDM communication system.
20. A system for receiving a signal comprising K different frequencies on at least N of antennas in a multiple antenna communication system, comprising:
at least N receive antennas for receiving said signal comprising K different frequencies, where N is greater than one;
a Fast Fourier Transformation stage for generating N*K low frequency signals based on each of said at least N received versions of said signal comprising K different frequencies; and
means for combining said N*K separate low frequency signals to recover a transmitted information signal, based on one or more transfer functions from each of a plurality of transmit antennas to each of said N receive antennas.
21. The system of claim 20 , wherein said means for combining further comprises a least squares estimation circuit and parallel to serial converter.
22. The system of claim 20 , wherein said signal comprising K different frequencies has a lower information rate than said information signal.
23. The system of claim 20 , wherein said transfer functions are determined by a geometry of a configuration of the multiple antenna communication system, wherein each of said transfer functions is associated with a different travel-path between an antenna of a first set of transmitters and an antenna of a receiver.
24. The system of claim 20 , wherein said transfer functions H are expressed as a complex number, wherein an amplitude of one of said complex numbers is an attenuation of a strength of a signal and wherein a phase of one of said complex numbers is a phase modulation incurred during transmission along a travel path.
25. The system of claim 20 , wherein said communication system is an OFDM communication system.
26. The system of claim 20 , wherein a number of antennas in a transmitter is different than said number N of receive antennas.