Abstract: The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate the IQ imbalance parameters. The data carried by the preamble repeats itself every N sampling intervals. A MSE equation is derived based on assuming the ratios between any two sampling points separated by N samples are identical, and the IQ imbalance parameters can be estimated by solving the MSE equation using the LS algorithm. Consequently, the IQ mismatch offset of the signal is compensated according to the estimated parameters.

Abstract: The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate the IQ imbalance parameters. The data carried by the preamble repeats itself every N sampling intervals. A MSE equation is derived based on assuming the ratios between any two sampling points separated by N samples are identical, and the IQ imbalance parameters can be estimated by solving the MSE equation using the LS algorithm. Consequently, the IQ mismatch offset of the signal is compensated according to the estimated parameters.

Abstract: A transmission power control method for a CDMA communication system which performs communication between a basestation and a plurality of mobile stations; comprising the steps of: transmitting uplink power from the plurality of the mobile stations to the basestation; measuring and receiving the uplink power transmitted from each of the plurality of mobile stations with different signal-to-interference (SIR) requirement thresholds at the basestation; taking a algorithm to converge the transmitted uplink power from each of the plurality of mobile stations; and calculating the uplink power transmitted from each of the plurality of mobile stations by a power convergence factor. The transmission power control method only needs the local measurements at the basestation and can meet different SIR requirements of mobile stations based on fair principle. Additionally, the transmission power control method of the present invention can not only converge fast, but also keep the transmitted power in a reasonable range.

Abstract: A transmission power control method for a CDMA communication system which performs communication between a basestation and a plurality of mobile stations; comprising the steps of: transmitting uplink power from the plurality of the mobile stations to the basestation; measuring and receiving the uplink power transmitted from each of the plurality of mobile stations with different signal-to-interference (SIR) requirement thresholds at the basestation; taking a algorithm to converge the transmitted uplink power from each of the plurality of mobile stations; and calculating the uplink power transmitted from each of the plurality of mobile stations by a power convergence factor. The transmission power control method only needs the local measurements at the basestation and can meet different SIR requirements of mobile stations based on fair principle. Additionally, the transmission power control method of the present invention can not only converge fast, but also keep the transmitted power in a reasonable range.