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,wherein the each subset is a random combination of the plurality of sub-arrays.
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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.
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Citations
7 Claims
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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:
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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, wherein the each subset is a random combination of the plurality of sub-arrays. - View Dependent Claims (2, 3, 4)
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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:
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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, wherein the each subset is a random combination of the plurality of sub-arrays. - View Dependent Claims (6, 7)
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Specification