Rate adaptive transmission scheme for MIMO systems
First Claim
1. A method of processing data for transmission in a multiple-input multiple-output (MIMO) communication system, the method comprising:
- receiving at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter; and
processing, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.
56 Citations
28 Claims
-
1. A method of processing data for transmission in a multiple-input multiple-output (MIMO) communication system, the method comprising:
-
receiving at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter; and processing, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:
at least one processor configured to; receive at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter; and process, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna. - View Dependent Claims (14)
-
15. An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:
-
means for receiving at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter; and means for processing, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna. - View Dependent Claims (16)
-
-
17. A non-transitory computer readable medium having program code recorded thereon, said program code comprising:
-
program code to cause at least one processor to receive at least one data symbol stream, each of the at least one data symbol stream being scaled with a respective weight corresponding to an amount of transmit power allocated to the data symbol stream, wherein a total amount of transmit power allocated to the at least one data symbol stream is less than or equal to total transmit power available for a transmitter; and program code to cause the at least one processor to process, at the transmitter, the at least one data symbol stream with a transmit basis matrix to provide a plurality of transmit symbol streams for transmission via a plurality of antennas at the transmitter, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding antenna. - View Dependent Claims (18)
-
-
19. A method of processing symbols in a multiple-input multiple-output (MIMO) communication system, the method comprising:
-
receiving a plurality of transmit symbol streams via a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna; and processing the plurality of received transmit symbol streams to recover the at least one data symbol stream. - View Dependent Claims (20, 21, 22)
-
-
23. An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:
at least one processor configured to; receive a plurality of transmit symbol streams via a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna; and process the plurality of received transmit symbol streams to recover the at least one data symbol stream. - View Dependent Claims (24)
-
25. An apparatus used in a multiple-input multiple-output (MIMO) communication system, the apparatus comprising:
-
means for receiving a plurality of transmit symbol streams via a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna; and means for processing the plurality of received transmit symbol streams to recover the at least one data symbol stream. - View Dependent Claims (26)
-
-
27. A non-transitory computer readable medium having program code recorded thereon, said program code comprising:
-
program code to cause at least one processor to receive a plurality of transmit symbol streams from a plurality of receive antennas at a receiver, wherein the plurality of transmit symbol streams are obtained at a transmitter by processing at least one data symbol stream with a transmit basis matrix before transmission from a plurality of transmit antennas at the transmitter to the plurality of receive antennas at the receiver, wherein the transmit basis matrix is defined to cause each of the at least one data symbol stream to be transmitted via the plurality of transmit antennas and each of the plurality of transmit symbol streams to be transmitted via a corresponding transmit antenna; and program code to cause the at least one processor to process the plurality of received transmit symbol streams to recover the at least one data symbol stream. - View Dependent Claims (28)
-
Specification