TAILIEUCHUNG - Novel Applications of the UWB Technologies Part 3

Tham khảo tài liệu 'novel applications of the uwb technologies part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Orthogonal Pulse-Based Modulation Schemes for Time Hopping Ultra Wideband Radio Systems 47 5 0_ -5 Capacity of 8-ary 4- ary schemes in multipath environments - 4 - - 3 - - 2 - - 1 - - 0 5 20 25 10 15 Eb N0 30 Fig. 6. The capacities of M-ary PSM M-ary BPSM and M-ary OPPM-BPSM schemes in a multipath environment where M 4 and 8. Eb N0 Fig. 7. The capacities of 16-ary PSM 16-ary BPSM and 16-ary OPPM-BPSM schemes in multipath environment. 48 Novel Applications of the UWB Technologies we have used 1st order PSWF and 1st order MHP in 32-ary BPPM. It is known that both the pules provide exactly the same correlation properties for the 1st order pulse. Fig. 6 Fig. 7 and Fig. 8 show that the average full capacity for all values of M for M-ary PSM is nearly achieved where the SNR is close to 23 dB 20 dB for M-ary BPSM and 17 dB for M-ary OPpM-BPSM. It is also observed that M-ary OPPM-BPSM has 3 dB more SNR than M-ary BPSM and 6 dB greater SNR than M-ary PSM at the same capacity. This is because of the use of orthogonal pulses resulting in that ISI and MAI are less for M-ary OPPM-BPSM scheme than M-ary PSM and M-ary BPSM schemes for the same value of M. However after 25 dB SNR the capacities are close to the same irrespective of the modulation schemes. Under the same simulation condition the system capacities of 16-ary BPPM 16-ary PSM 16-ary BPSM and 16-ary OPPM-BPSM as a function of number of MPC are provided in Fig. 9. It has been observed that capacities for all schemes decrease with increase in the number of MPC. This is because ISI and MAI increase with the increase in the number of MPC resulting in the reduction of mutual information. It proves that mutual information is inversely proportional to number of MPC. It is also observed that BPPM and OPPM-BPSM are more sensitive to the number of MPC. When number of MPC is more than 10 the capacities of BPPM and OPPM-BPSM are decreased more gradually than the PSM and BPSM scheme. It is because of involving .

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