Abstract: The present invention is to increase the efficiency of the transmission channel between the base stations and to improve the accuracy of the signal in transmitting the traffic information in the circuit communication method or TDM method in comparison with the packet method, and provides the method for speech coding at the Code Division Multiple Access base station which can solve the anticipated problem of the frame sync acquisition between base stations in such case.

Abstract: A method for detecting a strength of received signals of users in a code division multiple access system, which can upgrade a service quality for users and improve system performance by detecting strength of received signals in a code division multiple access system is disclosed. The apparatus comprises a radio frequency (RF) processor for receiving a high frequency power signal. A received power measuring device is connected to the radio frequency processor for measuring the strength of the power received from, the radio frequency processor. A correlator device is then connected to the received power measuring device for detecting a digital signal from the modulated signal of the received power measuring device. A channel processor device is provided for decoding the detected digital signal into an original digital signal in line with channels. A base station controller is connected to both the measuring device controller and the channel processor device for managing and controlling the channel processor.

Abstract: An initial synchronization method in a code division multiple access reception system for determining a pseudonoise (PN) code received in the system by receiving a signal corresponding to an interval of the PN code in a window size, determining representative values of corresponding ones of PN code chips in the window, respectively, and determining the representative values as chips of the PN code, comprising the steps of selecting n successive PN code chips having the same offset in each interval of the PN code, deriving mn (m<n) phase differences of the successive PN code chips in each interval of the PN code, and continuously deriving subsequent PN code chips, thereby deriving n PN code chips, and deriving representative values of n chips of the PN code, based on corresponding ones of the PN code chips derived in all intervals of the PN code, respectively, thereby determining the PN code. In order to verify the initial synchronization, a first PN code signal derived in the above procedure is used.

Abstract: The present invention relates to a method and apparatus of a forward traffic channel power control for a code division multiple access (CDMA) wireless local loop system not having a hand-off function. The present invention distinguishes between a normal mode and a threshold mode in a CDMA wireless local loop. Here, the total power is lower than a predetermined power threshold value in the normal mode, and the total power arrives at the predetermined power threshold value in the threshold mode. In addition, the present invention varies method of increasing/reducing the forward traffic channel power according to the determined mode. As a result, method and apparatus according to the present invention effectively reduces the forward link interference signal at nearby cells, and provides a proper traffic quality.

Abstract: The present invention is to increase the efficiency of the transmission channel between the base stations and to improve the accuracy of the signal in transmitting the traffic information in the circuit communication method or TDM method in comparison with the packet method, and provides the apparatus for speech coding at the Code Division Multiple Access base station which can solve the anticipated problem of the frame sync acquisition between base stations in such case.

Abstract: In a direct sequence spread spectrum communications system wherein user binary information symbols are spread spectrum modulated and transmitted to the other party, a non-coherent Walsh QPSK and a coherent Walsh QPSK modulation methods, wherein the PN spreading sequences for inphase and quadrature data in a conventional QPSK PN modulation scheme are coded by Walsh sequences indexed by a special rule to reduce the envelope variation of the transmitted signal, can reduce the envelope variation of transmit signal.