System implementing closed loop transmit diversity and method thereof
AssigneeMotorola, Inc.
InventorsRobert Mark Harrison, Mansoor Ahmed, Richard Tonge, Nick Whinnett
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Abstract
A method of and apparatus for adapting an antenna array for closed loop transmit diversity, the method comprising: receiving an adapting signal corresponding to an antenna array weighting pattern for a time period; demodulating the adapting signal to provide a symbol for the time period; determining a preferred symbol from the symbol for the time period and a previous symbol for a previous time period; and transmitting with an antenna array weighting pattern corresponding to the preferred symbol.
Claims18
A method of adapting an antenna array for closed loop transmit diversity, the method comprising:
- receiving an adapting signal corresponding to an antenna array weighting pattern for a time period;
- demodulating said adapting signal to provide a symbol for said time period;
- determining a preferred symbol from said symbol for said time period and a previous symbol for a previous time period, wherein said determining said preferred symbol further includes selecting one of said symbol for said time period and said previous symbol for said previous time period, and wherein said selecting further includes comparing a symbol amplitude to a threshold and when said threshold is satisfied choosing said symbol as said preferred symbol else choosing said previous symbol as said preferred symbol;
- and
- transmitting with an antenna array weighting pattern corresponding to said preferred symbol.
A method of adapting an antenna array for closed loop transmit diversity, the method comprising:
- receiving an adapting signal corresponding to an antenna array weighting pattern for a time period;
- demodulating said adapting signal to provide a plurality of symbols for said time period;
- determining a preferred plurality of symbols from said plurality of symbols for said time period and a previous plurality of symbols for a previous rime period, wherein said determining said preferred plurality of symbols further includes selecting one of said plurality of symbols for said time period and said previous plurality of symbols for said previous time period, wherein said selecting further includes comparing an amplitude of each symbol of said plurality of symbols to a threshold and when said threshold is satisfied for all symbols of said plurality of symbols choosing said plurality of symbols as said preferred plurality of symbols else choosing said previous plurality of symbols as said preferred plurality of symbols;
- and
- transmitting with an antenna array weighting pattern corresponding to said preferred plurality of symbols.
A method of adapting an antenna array for closed loop transmit diversity, the method comprising:
- receiving an adapting signal corresponding to an antenna array weighting pattern for a time period;
- demodulating said adapting signal to provide a plurality of symbols;
- determining a confidence metric for each of said plurality of symbols;
- forming an ordered set of symbols comprising each of said plurality of symbols having a favorable confidence metric and a last used symbol for each of said plurality of symbols having an unfavorable confidence metric;
- and
- selecting an antenna array weighting pattern corresponding to said ordered set of symbols.
An apparatus for selecting an antenna array weighting pattern for use by a base transmitter using an antenna array in a closed loop transmit diversity system, the apparatus comprising:
- a receiver for receiving and demodulating an uplink control channel signal to provide a sequence of symbols and a, respective, sequence of corresponding confidence metrics;
- a comparator for comparing each confidence metric of said respective sequence of corresponding confidence metrics to a threshold to determine whether each symbol of said sequence of symbols is reliable;
- a register for constructing a code word comprising an ordered set of each of said sequence of symbols that is reliable and a last used symbol for each of said sequence of symbols that is not reliable;
- and
- a decoder for selecting an antenna array weighting pattern corresponding to said code word.
Dependencies are inferred from the claim text.