Method of determining the capacity of each transmitter antenna in a multiple input/multiple out/put (MIMO) wireless system
First Claim
1. In a multiple input/multiple output wireless system in which a plurality of transmitter antennas at a transmitter end of the system transmit a plurality of signals on separate channels to a plurality of receiver antennas at a receiver end of the system, a method comprising:
- determining, at the receiver end, instantaneous channel coefficients of each of the separate channels between the plurality of transmitter antennas and the plurality of receiver antennas;
determining an average signal-to-noise ratio of the signals received by the receiver antennas; and
calculating, using the determined instantaneous channel coefficients and the determined average signal-to-noise ratio, the individual capacities of the transmitter antennas.
5 Assignments
0 Petitions
Accused Products
Abstract
The per antenna capacity of each of the transmitter antennas in a MIMO system are individually determined from measurable information at the receiver end. Specifically, the channel capacity for each individual transmitter antenna is calculated at the receiver end as a function of measurable channel coefficients (also known as channel state information), the measurable average signal-to-noise ratio, and the number of transmitter antennas. Once the per antenna capacity of each transmitter antenna is individually determined at the receiver end, the maximum transmission rate for each data stream transmitted by each transmitter antenna is determined from that individual capacity either at the receiver end and fed back to the transmitter end, or is determined at the transmitter end from the individual transmitter antenna capacities that are fed back by the receiver end to the transmitter end. A modulation scheme that supports each maximum transmission rate is then determined based on some defined criteria.
87 Citations
17 Claims
-
1. In a multiple input/multiple output wireless system in which a plurality of transmitter antennas at a transmitter end of the system transmit a plurality of signals on separate channels to a plurality of receiver antennas at a receiver end of the system, a method comprising:
-
determining, at the receiver end, instantaneous channel coefficients of each of the separate channels between the plurality of transmitter antennas and the plurality of receiver antennas;
determining an average signal-to-noise ratio of the signals received by the receiver antennas; and
calculating, using the determined instantaneous channel coefficients and the determined average signal-to-noise ratio, the individual capacities of the transmitter antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. In a multiple input/multiple output wireless system in which a plurality of transmitter antennas at a transmitter end of the system transmit a plurality of signals on separate channels to a plurality of receiver antennas at a receiver end, a method comprising:
determining, at the receiver end, the individual capacity of each of the transmitter antennas from instantaneous channel coefficients of the separate channels and a measured average signal-to-noise ratio of the transmitted signals received at the receiver end. - View Dependent Claims (9, 10, 11)
-
12. Apparatus at a receiver end of a multiple input/multiple output wireless system in which a plurality of transmitter antennas at a transmitter end of a wireless system transmit a plurality of signals on separate channels to a plurality of receiver antennas at the receiver end of the system, the apparatus comprising:
-
means for determining instantaneous channel coefficients of the each of the separate channels between the transmitter antennas and receiver antennas;
means for determining an average signal-to-noise ratio of the signals received by the receiver antenna; and
means for calculating, using the determined instantaneous channel coefficients and the determined average signal-to-noise ratio, the individual capacities of each of the transmitter antennas. - View Dependent Claims (13, 14, 15, 16, 17)
-
Specification
-
- Resources
-
Current AssigneeWSOU Investments, LLC (WSOU Holdings, LLC)
-
Original AssigneeLucent Technologies, Inc. (Nokia Corporation)
-
InventorsRudrapatna, Ashok N., Liu, Jung-Tao
-
Granted Patent
-
Time in Patent OfficeDays
-
Field of Search
-
US Class Current375/347
-
CPC Class CodesH04B 7/04 using two or more spaced in...H04B 7/061 using feedback from receivi...H04B 7/0619 using feedback from receivi...H04L 1/0003 by switching between differ...H04L 1/0013 Rate matching, e.g. punctur...H04L 1/0068 by puncturingH04L 1/08 by repeating transmission, ...
