Radio communications device
First Claim
1. A radio communications device comprising three or more diverse antennas and either a plurality of transmit chains or a plurality of receive chains, and wherein there are fewer transmit or receive chains than antennas.
3 Assignments
0 Petitions
Accused Products
Abstract
To reduce costs in multiple-input multiple-output (MIMO) transmit or receive diversity wireless communications systems an arrangement is described whereby the number of transmit or receive chains can be reduced. Switched antenna selection is used at the transmitter or receiver. Particular advantages are found for nomadic and high speed mobility MIMO user terminals where improvements in capacity are found. In addition improved ability to deal with the effects of spatial fading is achieved. Embodiments using directional antennas in combination with switched selection are also described. These are particularly advantageous for compact user equipment intended for nomadic or mobile use.
123 Citations
25 Claims
- 1. A radio communications device comprising three or more diverse antennas and either a plurality of transmit chains or a plurality of receive chains, and wherein there are fewer transmit or receive chains than antennas.
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22. A method of operating a radio communications device which comprises three or more diverse antennas and either a plurality of transmit chains or a plurality of receive chains, and wherein there are fewer transmit or receive chains than antennas, said method comprising the steps of:
(i) selecting, for each receive chain or for each transmit chain, any one of the antennas for use in conjunction with that receive or transmit chain. - View Dependent Claims (23, 25)
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24. A method as claimed in claim 26 wherein said antenna arrangement is arranged to provide multiple-input multiple-output communications and wherein said selector is arranged to select on the basis of parameters related to any of, a frame error rate, link capacity, cyclic redundancy check information and eigenvalues.
Specification