In wireless communication systems some require high data rate which can be greater than 100Mb/s which is a short range. Here ultra-wideband (UWB) systems can be used as it has high channel capacity. The spectrum available in UWB is used in orthogonal frequency division multiplexing systems with multi band (MB-OFDM) for various applications in communication. The major barrier in communication system is high peak average power ratio (PAPR) due to the disturbances caused in transmitting components which are nonlinear in nature. It is very much essential to reduce the PAPR to maximum extent in MB-OFDM UWB signals. In this paper, Hybrid optimization technique is considered by combining Grey-wolf and firefly algorithm for PAPR reduction. The noise reduction is performed for the UWB signals and results need to be analysed. In this paper the evaluation of proposed algorithm is shown by calculating the error rate per bit (BER) and PAPR. The obtained results are compared with other optimization techniques. Our results demonstrated hybridization of optimization technique is a promising technique for the transmission of MB-OFDM UWB signals compared to genetic algorithm, firefly optimization and grey wolf optimization-based MB-OFDM UWB signal transmission.