초록 ▼

The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packe

The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packet or frame error rates (PER or FER) cannot be estimated accurately. Moreover, since this method provides a mechanism for accurate set point adjustment even without a PER (FER) estimate, it can also be used to improve the accuracy of outer loop performance when such estimate becomes available. The present invention estimates a "pilot bit error rate" (PBER), where each pilot "bit" consists of a number pilot chips distributed over a frame. In addition, it estimates the normalized variance of the signal energy (or C/I) for each packet. In addition, in the preferred embodiment, the average number of fingers in lock is also used to determine the power control set point.

대표청구항 ▼

The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packe

The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packet or frame error rates (PER or FER) cannot be estimated accurately. Moreover, since this method provides a mechanism for accurate set point adjustment even without a PER (FER) estimate, it can also be used to improve the accuracy of outer loop performance when such estimate becomes available. The present invention estimates a "pilot bit error rate" (PBER), where each pilot "bit" consists of a number pilot chips distributed over a frame. In addition, it estimates the normalized variance of the signal energy (or C/I) for each packet. In addition, in the preferred embodiment, the average number of fingers in lock is also used to determine the power control set point. at a predetermined gain value to rotate the disk; reading out data; determining if the data being read out is sequential data; determining if a zone change has occurred; maintaining the predetermined gain value of the spindle motor if no zone change has occurred; and attenuating the gain value of the spindle motor if a zone change has occurred and said data being read out is sequential data, thereby controlling the spindle motor and the number of disk revolutions, to prevent read-out errors that commonly occur after a zone change due to an abrupt variation in the number of disk revolutions. 7. A method according to claim 6, wherein a seek operation is executed if the data being read out is determined not to be sequential. 8. A method according to claim 6, wherein the predetermined gain value is set in accordance with a general data read out.