Wireless communications apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsMagnus Stig Torsten Sandell, Justin Coon
Life of this patent
Estimating the term…
Abstract
Allocation of subcarriers of a wireless communications channel to antennas for transmission of said subcarriers from a multi-antenna transmitter, comprises selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion; and determining if subcarriers are evenly distributed amongst said antennas. If even distribution does not arise, then a reallocation sequence is performed. This comprises identifying, for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto and reallocating one of said subcarriers as required, said reallocated subcarrier being selected for reallocation on the basis of its impact on transmission performance.
Claims16
A method of allocating subcarriers of a wireless signal to antennas for transmission of said subcarriers from a multi-antenna transmitter, the method comprising:
- allocating subcarriers to antennas by selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion;
- and
- determining if subcarriers are evenly distributed amongst said antennas and, if not, performing a reallocation sequence comprising:
- identifying, for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto;
- and
- reallocating one of said subcarriers as required, said reallocated subcarrier being selected for reallocation on the basis of its impact on transmission performance.
A communications apparatus operable to establish a wireless transmission on a signal defined with a plurality of subcarriers, the communications apparatus comprising:
- a plurality of antennas for emission of transmit signals therefrom;
- and
- subcarrier allocation means operable to allocate subcarriers to antennas for transmission by selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion;
- the subcarrier allocation means being operable to determine if subcarriers are evenly distributed amongst said antennas and, if not, to identify for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto;
- the subcarrier allocations means being further operable to re-allocate one or more subcarriers away from an antenna with excessive subcarriers allocated thereto, a subcarrier being selected for reallocation on the basis of impact of said reallocation on transmission performance.
Dependencies are inferred from the claim text.