In this paper, a multiple-access spread-spectrum communication system using binary frequency shift keying (BFSK) or M -ary frequency shift keying (MFSK), and noncoherent demodulation is considered. In contrast to previous work typically assuming that the FSK tones are non-overlapping after direct-sequence (DS) spreading, here we consider a spread spectrum multiple access (SSMA) system under the...

Spread spectrum (SS) technology is a data transfer technique designed to overcome the interference problems associated with narrow-band very high frequency and ultra high frequency Data transfer systems. Spread spectrum communication is used to reduce jamming of communication signal and provides a highly secure communication. In this paper we specifies the Field Programmable Gate Array (FPGA) i...

Spread spectrum techniques are often employed when transmitting information. They are widely used in wireless and cellular telephony. Spread spectrum techniques allow one to partition bandwidth, to hide transmissions, and to protect one’s transmissions from being jammed. In this article, we develop two facets of spread spectrum. We show how to understand the properties of direct sequence spread...

The Direct-Sequence Spread Spectrum modulation (DSSS) is a very attractive modulation technique for military communication systems, mainly due to its resistance to interference and low probability of detection. However, the synchronisation to the spreading code phase in the receiver takes time, which makes this technique less interesting for sending very short messages. In this paper a novel di...