Bellhop modulation issue in rx signal plotting

hi everyone im working on program in which im trying to plot modulated data using arrival file of bellhop ray traycing tool, im using amplitude nad delay from bellhop .arr file then generating the impulse responce of then convolving it with the tx signal the rx signal sould be one big pluse replicating tx signal with noise and 2 or 3 very small pulses but im getting only noisy signala please help me im stuck in it.

[Sana Ahmed]

im using this code from here http://www.zhongruitech.com/280966661.html