At the receiver, de-spreading is accomplished using the same code sequence operating in synchronism with the transmitter. The spectrum spreading is accomplished by means of a wideband spread signal, often called a code signal, which is independent of data.ģ. The modulated signal occupies a more bandwidth than required minimum bandwidth necessary to send the dataĢ. In narrow band signal estimation is not accurate as compare to the wide band OFDM system, in order to provide the more reliable communication the system utilizes the wide band signal, the frequency hopping spread spectrum transmitter will make the ISM band into number parts that is frequency slots, these slots separated by some MHz frequency.Ī system is defined to be a spread spectrum system if it fulfills the following requirementsġ. It will be protected from fading effect in decoding at the receiver. In this the optimal joint maximum likelihood estimator for time and frequency offset of the additive white Gaussian noise (AGSN) channel has been presented for broadcasting. The FHSS transceiver is implemented for TDMA system it uses the PN sequence for hopping from one carrier frequency to other carrier frequency. To fulfill the requirement the system uses OFDM technique in the transmitter and receiver. Mathematical modelling is used to simulate and analyse the performance improvement by using frequency hopping spread spectrum with popular modulation schemes, and also the hopping channel situations are investigated.Ī multiuser Time Division Multiple Access - Orthogonal Frequency Division Multiplexing (TDMA-OFDM) system, the evolution process of different radio interface proposal for the Universal Mobile Telecommunication System (UMTS) which is standardized to European telecommunication standard institute (ETSI). Adaptive frequency hopping is a system which is used to improve immunity toward frequency interference by avoiding using congested frequency channels in hopping sequence. For frequency hopping a mechanism must be designed so that the data can be transmitted in a clear channel and avoid congested channels. Frequency hopping spread spectrum (FHSS) is a transmission technique where the carrier hops from frequency to frequency. To improve the performance of short-range wireless communications, channel quality must be improved by avoiding interference and multi-path fading. The overall design is modeled and simulated using MATLAB-Simulink KeywordsįHSS, PN Sequence Generator, BER, AWGN Channel. And at receiver side the data recovered as well as the Bit Error Rate is estimated at the receiver. And the communication channel used as Additive white Gaussian noise (AWGN) Channel is preferred in this work. This system is very popular because it is a secure communication model which utilizes the Pseudo Random Noise (PN) Sequence as a carries signal. This Frequency Hopping Spread Spectrum transceiver is designed to provide the secure communication the communication domain.