Adaptive antenna transmit array with reduced CDMA pilot channel set
AssigneeNokia Mobile Phones Ltd.
InventorsR. Thomas Derryberry, Balaji Raghothaman
Life of this patent
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Abstract
An adaptive transmit antenna array having a reduced pilot set is disclosed. The adaptive transmit antenna array utilizes a decision-directed mechanism for the estimation of maximal ratio combining (MRC) weights to be used at a receiver rather than requiring a user-specific pilot to provide estimation information.
Claims13
A method for transmitting data in a telecommunication system having a first transceiver and a second transceiver, wherein said second transceiver transmits to said first transceiver on a plurality of channels, each of said plurality of channels transmitted from one of a plurality of antennas, said method comprising the steps of:
- determining a first at least one weight for each of the plurality of channels in the first transceiver;
- coding, weighting, using said first at least one weight for each of said plurality of channels, and modulating first data in said second transceiver to generate first weighted data;
- decoding said first weighted data using said first at least one weight for each of said plurality of channels in said first transceiver to generate first decoded data in the first transceiver;
- determining that an error exists in said first decoded data at the first transceiver;
- and, in response to a determination that an error exists in said first decoded data:
- recoding and remodulating said first decoded data to generate recoded/remodulated data;
- estimating a second at least one weight for each of said plurality of channels from said recorded/remodulated data and said first weighted data;
- and
- decoding said first weighted data using said second at least one weight for each of said plurality of channels to generate second decoded data at said first transceiver.
A method for receiving data transmitted on a plurality of channels, each of said plurality of channels transmitted from one of a plurality of antennas, to a first transceiver in a telecommunication system, said method comprising:
- determining a first at least one weight for each of the plurality of channels in the first transceiver;
- transmitting said first at least one weight for each of the plurality of channels from the first transceiver to a second transceiver;
- receiving first weighted data at said first transceiver, said first weighted data transmitted from said second transceiver after coding, weighting, using said first at least one weight for each of said plurality of channels, and modulating in said second receiver;
- decoding said first weighted data using said first at least one weight for each of said plurality of channels in said first transceiver to generate first decoded data in the first transceiver;
- determining that an error exists in said first decoded data;
- and, in response to a determination that an error exists in said first decoded data:
- recoding and remodulating said first decoded data to generate recoded/remodulated data;
- estimating a second at least one weight for each of said plurality of channels from said recoded/remodulated data and said first weighted data;
- and
- decoding said first weighted data using said second at least one weight for each of said plurality of channels to generate second decoded data.
An apparatus for transmitting data in a telecommunication system, said apparatus comprising:
- a transceiver comprising:
- a first receiver for receiving transmissions including first weighted data on a plurality of channels;
- a decoder coupled to said first receiver, said decoder for decoding said first weighted data using a first at least one weight for each of said plurality of channels in said transceiver to generate first decoded data in the transceiver, said decoder further for decoding said first weighted data a second time using a second at least one weight for each of said plurality of channels in response to receiving a control signal;
- an error detector coupled to said decoder, said error detector for determining that an error exists in said first decoded data and generating an error signal;
- a recoder and remodulator coupled to said decoder, said recoder and remodulator for recoding and remodulating, in response to an error signal being generated in said error detector, said first decoded data to generate recoded/remodulated data;
- and
- an estimator coupled to said recoder and remodulator, said recoder and remodulator for estimating said second at least one weight for each of said plurality of channels from said recoded/remodulated data and said first weighted data, said estimator further for generating swaid control signal in response to estimating said second at least one weight and sending said control signal to said decoder.
Dependencies are inferred from the claim text.