Spread spectrum techniques are very useful in military and mobile communication applications. The instrumentation of a complete spread-spectrum system involves basically the design and generation of address codes and the design and development of the receiver for acquisition and tracking the code. In this paper, the generalized design philosophy of the transmitter of the spread-spectrum system has been described. An experimental transmitter system, with a bandwidth expansion of 2000 times, to transmit 1 Kbps data signal over a channel bandwidth of 2 MHz has been designed and developed. Pseudonoise (PN) codes have been identified to serve as addresses because of their acceptable correlation properties. Hardware realization of transmitter has been made in the laboratory and its performance was studied. Results of our investigation are reported in this paper.
展开▼
