DS-CDMA and adaptive modulation based TDMA dual mode scheme for high speed data transmission service in wireless multimedia communication systems

摘要: This paper proposes a direct sequence-code division multiple access (DS-CDMA) and adaptive modulation based time (TDMA) dual mode system to achieve high speed data transmission services in wireless multimedia communication systems. In the proposed system, TDMA sub-frame is employed increase maximum bit rate only for terminals of which parameters are adaptively updated according received CIR so as sufficiently utilize spectral resource. Moreover, dynamic channel assignment (DCA) multilevel transmit power control (MLTPC) also mitigate interference cellular environment. Computer simulation confirms that can reduce average normalized delay by about 1/25 compared with CDMA systems its 64 kbps without much decreasing voice capacity.