# Proposal of Adaptive Downlink Modulation Using OFDM and MC-CDMA for Future Mobile Communications System

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3 Bandwidth Number of sub-carriers Symbol duration Channel model Maximum Doppler frequency slot length Shape of cell Radius of cell Transmission power Propagation model Shadowing deviation Chanel estimation Channel frequency Modulation Spreading factor (MC-CDMA) Channel coding Transmission rate MC-CDMA (SF=) MC-CDMA () MC-CDMA () MHz 26 Data:6.µs, GI:1.6µs 2-paths Rayleigh fading, =nsec 2Hz Symbol hexagon m 2mW ().th power attenuation 7 db Ideal estimation GHz BPSK,,, 8, 16 Conbolutional coding (, 2/, /, K=7) 16Mbps(BPSK, ), 8Mbps(, ), 96Mbps(,) Mbps(BPSK, ), 1.7Mbps(, R=2/), 2Mbps(,) 2Mbps(BPSK, ), Mbps(, ), 8Mbps(,), 12Mbps(, 1Mbps(BPSK, ), 2Mbps(, ),.Mbps(,R=2/), Table 1: Simulation parameters 1-9. RSSI [dbm] SF= BPSK R=2/ SF= Figure : Modulation and coding types for the BPSK Figure : Modulation and coding type for the MC-CDMA users (The number of users is in the range of 1 and ) R=2/ BPSK BPSK Figure 6: Modulation and coding type for the MC-CDMA users Figure 7: Modulation and coding type for the MC-CDMA users (The number of users is in the range of and 8) (The number of users is in the range of 9 and 16) -7 R=2/ for the adaptive modulation technique are selected to achieve high throughput performance under different RSSI and CIR conditions. In the simulation, co-channel interference from two consecutive adjacent cells is considered. The target cell is set to one and users are arranged at random with equal probability condition in

5 =1 MC-CDMA=1 =2 MC-CDMA=1 = MC-CDMA=1 =1 MC-CDMA=2 =1 MC-CDMA= = MC-CDMA=1 =number of usrs MC-CDMA= =1 MC-CDMA=1 =2 MC-CDMA=1 = MC-CDMA=1 =1 MC-CDMA=2 =1 MC-CDMA= =number of usrs MC-CDMA= Figure 8: Mean throughput performance per user vs. number of users Figure 9: Mean throughput performance for slots per user of users vs. number of users =1 MC-CDMA=1 =2 MC-CDMA=1 = MC-CDMA=1 =1 MC-CDMA=2 =1 MC-CDMA= = MC-CDMA= Total MC-CDMA Number of slots Figure 1: Man throughput performance per user for MC-CDMA slots vs. number of users Figure 11: Mean throughput performance per user vs. number of slots when number of total slots and users are 1 and 2, respectively Number of slots Total MC-CDMA Figure 12 Mean throughput performance per user vs. number of slots when numbers of total slots and users are 1 and 2, respectively. Conclusion This paper presented an adaptive downlink modulation scheme using and MC-CDMA for future mobile communications systems. The proposed scheme maximizes the system capacity by allocating a preferable modulation scheme to each time slot per user and offers types of QoS services depending on user locations and channel conditions. The detailed adaptive modulation technique and selection algorithm were explained in this paper. Computer simulation was conducted to evaluate the throughput performance of the proposed system by changing the number of users, slots and MC-CDMA slots. From the simulation results, according to the number of users, the proposed scheme using and MC-CDMA exceeds the throughput performance of the system or MC-CDMA system when the number of slots and MC-CDMA slots are selected as one respectively. The simulation results also indicate that the proportion of high-speed users and lower rate users is adjustable without decreasing the total throughput performance of the system. Thus, the proposed

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