초록 ▼

A method and apparatus are disclosed for determining the data rate of a received signal in a communication system utilizing code division multiple access (CDMA) techniques. The well-known Viterbi decoding-based rate detection approach is combined with the conventional repetition pattern-based rate d

A method and apparatus are disclosed for determining the data rate of a received signal in a communication system utilizing code division multiple access (CDMA) techniques. The well-known Viterbi decoding-based rate detection approach is combined with the conventional repetition pattern-based rate detection approach. The hybrid approach possesses the advantages of both prior approaches, without their disadvantages. The computationally efficient repetition pattern-based data rate detection approach, while not as reliable as the Viterbi decoder-based data rate detection approach, provides reliable data rate detection most of the time. The repetition-pattern data rate detection approach is used as long as a predefined reliability metric is satisfied, and only uses the more computationally intensive Viterbi decoder-based data rate detection approach when detection reliability may be compromised. Under the hybrid rate detection scheme, a decision variable based on repetition patterns is initially formed and a decision is made on the data rate if the decision variable is in a reliable region. Otherwise, the Viterbi decoding-based rate detection scheme is employed.

대표청구항 ▼

A method and apparatus are disclosed for determining the data rate of a received signal in a communication system utilizing code division multiple access (CDMA) techniques. The well-known Viterbi decoding-based rate detection approach is combined with the conventional repetition pattern-based rate d

A method and apparatus are disclosed for determining the data rate of a received signal in a communication system utilizing code division multiple access (CDMA) techniques. The well-known Viterbi decoding-based rate detection approach is combined with the conventional repetition pattern-based rate detection approach. The hybrid approach possesses the advantages of both prior approaches, without their disadvantages. The computationally efficient repetition pattern-based data rate detection approach, while not as reliable as the Viterbi decoder-based data rate detection approach, provides reliable data rate detection most of the time. The repetition-pattern data rate detection approach is used as long as a predefined reliability metric is satisfied, and only uses the more computationally intensive Viterbi decoder-based data rate detection approach when detection reliability may be compromised. Under the hybrid rate detection scheme, a decision variable based on repetition patterns is initially formed and a decision is made on the data rate if the decision variable is in a reliable region. Otherwise, the Viterbi decoding-based rate detection scheme is employed. 1. A power control method in a mobile communications system in which transmission of a signal of one logical connection over the radio path employs frequency hopping whereby the transmission frequency on the radio connection is changed at specific intervals among at least two hopping frequencies, the power control method comprising: transmitting a signal with a certain transmission power at one of the hopping frequencies from a sending end of the radio connection; determining at the receiving end of the radio connection, based on the quality of the received signal, power adjustment need for the next transmission at the same hopping frequency; transmitting a power adjustment command to the sending end of the radio connection; and adjusting at the sending end of the radio connection transmission power of the next transmission at said hopping frequency according to the received power adjustment command, wherein the transmission power is adjusted on said radio connection from hopping frequency to hopping frequency so that the transmission power of at least one hopping frequency used on the radio connection differs from the transmission power of at least one other hopping frequency used on the same radio connection. 2. The power control method according to claim 1, wherein adjusting the transmission power in a timeslot is based on the quality measured in a previous timeslot of the same frequency. 3. The power control method according to claim 1, wherein adjusting the transmission power in a timeslot is based on the quality measured in a previous timeslot. 4. The power control method according to claim 1, wherein the transmission power is only increased on the hopping frequency on which the quality of the received signal was determined, in case the quality determined for the received signal is poor. 5. The power control method according to claim 1, wherein the transmission power is increased on all the other hopping frequencies of the radio connection but the frequency on which the quality of the received signal was determined, in case the quality determined for the received signal is poor. 6. The power control method according to claim 5, wherein the transmission power is reduced on the frequency on which the quality of the received signal was determined. 7. The power control method according to claim 5, further comprising balancing the transmission power differences between the frequencies of the radio connection by increasing a low transmission power level when the difference of the transmission power levels equals the transmitter dynamics. 8. A power control method in a mobile communications system in which transmission of a signal of one logical connection over the radio path employs antenna hopping whereby the antenna used to transmit the radio signal is changed at specific intervals between at least two hopping antennas, characterized in that the method comprises the steps of determining the quality of the signal received on the radio connection for one-antenna, and carrying out power adjustment from hopping antenna to hopping antenna on said radio connection so that the transmission power of transmission from at least one antenna used on the radio connection differs from the transmission power of transmission from at least one other antenna used on the same radio connection. 9. A method according to claim 8, characterized by measuring the received signal quality from timeslot to timeslot, and adjusting the transmission power in the timeslot being dealt with based on the quality measured in the previous one timeslot of the same antenna. 10. A method according to claim 8, characterized by measuring the received signal quality from timeslot to timeslot, and adjusting the transmission power in the timeslot being dealt with based on the quality measured in the previous one timeslot. 11. A method according to claim 8, characterized in that the transmission power is only increased when transmitting via the