Design and Performance Analysis of UWB TH-MA Scheme Using Multi-code Based PPM

--~~~~~ ~~~~~~~~~ ~~~ .... ~ .~~. ..... demodulated through two stages. In the first stage, the multi-code based PPM signal is demodulated through the Bayes decision Then, in the second stage, the demodulated multi-code signal is de-spreaded by using the M orthogonal spreading codes rule. Then, in the second stage, the demodulated multi-code signal is de-spreaded by using the M orthogonal SPreadmg codes that am used in the transmitter. The BER performance and hit transmission rate (R.) of the nmnosed scheme is analvzed. that are used in the transmitter. The BER performance~and bit transmission rate of the proposed scheme is analyzed. As a achieve very we see that the proposed , ~~~~ . ~1~~ ~~~~ ~ ~ ~~~~~~ \ ~", Numerical results show that the proposed scheme has a much higher hit transmission rate than the conventional PPM scheme high transmission rate and due to this merit of the very high transmission rate, it can achieve benefits in enhancing the BER as M increases and also has better BER performance than the conventional PPM scheme in the same hit transmission case because it can achieve an additional spreading gain. performance by controlling the length of the spreading gain. ~~~~~h results, the perfomance of the proposed scheme is guaranteed and compared with other schemes.