Cyclic delay diversity based transmission with delay hopping
A method of providing delay information in a multi-antenna transmission system is provided. A time delay value is selected from a set of time delay values. A mobile station is informed of information related to the selected time delay value. The same data is transmitted from a first antenna and from a second antenna. The data is transmitted from the second antenna after the data is transmitted from the first antenna according to the selected time delay value. The time delay value is selected based on a deterministic method or a random method.
1. A method for transmitting signals at an eNodeB using a plurality of antennas in a wireless communication system, the method comprising:
selecting a time delay value from a set of time delay values based on non-cyclic-delay-diversity information from a receiver, wherein the non-cyclic-delay-diversity information is acknowledgment information comprising positive acknowledgments and negative acknowledgments;
transmitting data from a first antenna and a second antenna of the plurality of antennas, the data transmitted from the second antenna after the data is transmitted from the first antenna according to the selected time delay value;
assigning a probability to each time delay value in the set of time delay values;
decreasing the probability related to a specific time delay value of the time delay values and increasing the probabilities related to other time delay values of the time delay values if negative acknowledgments are received for data transmitted with the specific time delay value and a number of the negative acknowledgments is greater than a negative-acknowledgment threshold; and
increasing the probability related to a specific time delay value of the time delay values and decreasing the probabilities related to other time delay values of the time delay values if positive acknowledgments are received for data transmitted with the specific time delay value and a number of the positive acknowledgments is greater than a positive-acknowledgment threshold.
2. The method of claim 1 , further comprising informing a mobile station of information related to the selected time delay value.
3. The method of claim 1 , further comprising modifying a time interval between selections of the time delay value.
4. A method for transmitting signals at an eNodeB using a plurality of antennas in a wireless communication system, the method comprising:
generating a set of symbols; and
transmitting the set of symbols through the plurality of antennas;
wherein the set of symbols includes first type symbols, second type symbols and third type symbols,
wherein the second type symbols are cyclic time-delayed with a predetermined value with respect to the first type symbols, and
wherein the third type symbols are cyclic time-delayed with the predetermined value with respect to the second type symbols.
5. The method of claim 4 , wherein the set of symbols are orthogonal frequency division multiplexing (OFDM) symbols.