Method and apparatus of adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes based on symbol error rate in distributed wireless communication system
First Claim
1. An apparatus for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising:
- a plurality of geographically distributed sub-arrays for beamforming, each sub-array of said plurality comprising a plurality of distributed antennas placed in random groups; and
a central processing unit foridentification of a performance of each subset of the sub-arrays by applying a predetermined power allocation scheme thereto, each said subset being obtained by combining the sub-arrays using a Nakagami fading parameter and information about large-scale fading of each sub-array of the sub-arrays fed back from a receiving party,determination of a subset having a best identified performance as an optimal subset according to the identified performances thereof, andperformance of power allocation based on the subset determined as the optimal subset.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an apparatus and method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising: a plurality of sub-arrays for beamforming, which are geographically distributed and each of which comprises a plurality of distributed antennas placed in random groups; and a central processing unit for identifying performances of subsets by applying a predetermined power allocation scheme according to subsets which can be obtained by combining the sub-arrays, by means of a Nakagami fading parameter and information about large-scale fading of each of the sub-arrays, fed back from a receiving party, for determining a subset having a best performance as an optimal subset according to the identified performances, and for performing power allocation based on the subset set as the optimal subset.
-
Citations
7 Claims
-
1. An apparatus for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising:
-
a plurality of geographically distributed sub-arrays for beamforming, each sub-array of said plurality comprising a plurality of distributed antennas placed in random groups; and a central processing unit for identification of a performance of each subset of the sub-arrays by applying a predetermined power allocation scheme thereto, each said subset being obtained by combining the sub-arrays using a Nakagami fading parameter and information about large-scale fading of each sub-array of the sub-arrays fed back from a receiving party, determination of a subset having a best identified performance as an optimal subset according to the identified performances thereof, and performance of power allocation based on the subset determined as the optimal subset. - View Dependent Claims (2, 3, 4)
-
-
5. A method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system including a plurality of geographically-distributed sub-arrays for beamforming, each of which comprises a plurality of distributed antennas placed in random groups, the method comprising the steps of:
-
estimating a direction-of-arrival (DOA) for each antenna sub-array of the plurality of geographically-distributed sub-arrays; creating an array response vector for each antenna sub-array using the estimated DOA thereof; obtaining at least one subset of each said antenna sub-array based on the array response vector; determining an obtained subset having a lowest symbol error rate as an optimal subset; allocating transmission power to each said at least one obtained subset based on the subset determined as the optimal subset; and within each sub-array, performing beamforming combined with orthogonal space-time block codes using said allocated transmission power. - View Dependent Claims (6, 7)
-
Specification