earticle

영어

Spread Spectrum technique transmits the information message (signal) over a bandwidth much larger than its frequency contents or the original bandwidth of information message. In SS technique, a signal (having a specific bandwidth) is spread in the frequency domain and results in a signal having wider bandwidth. Remember, the new resulting bandwidth of a signal is much larger than the minimum required frequency spectrum. In Direct Sequence Spread Spectrum, i.e., DSSS (one of the common techniques of SS) the transmitting information signal is multiplied or combined with the spreading signal (usually Barker code) of wider bandwidth and results in a modulation signal that take up the wide bandwidth of the spreading signal. This new consequential signal is then combined with a carrier signal before transmission. The most important advantage of DSSS technology is the accepted transmission security. In this paper, a novel scheme is proposed that helps out the traditional DSSS system to enhance the transmission security by using random selection of multiple spreading codes in DSSS. In this paper the 11-bit spreading (Barker’s) code is taken under the consideration as the spreading code.