BER analysis of communication systems employing orthogonal frequency coding in surface acoustic wave (SAW) correlators

Orthogonal frequency coding is often used for surface acoustic wave (SAW) based systems. This paper presents the theoretical analysis of orthogonal frequency coding technique used with on-off keying in communications systems. The interference encountered in multiuser environment is formulated and a code selection criterion for minimizing the interference is proposed. The analytical expression for bit error rate (BER) is derived for an additive white Gaussian noise channel considering multiple access interference. BER performance for different lengths of orthogonal frequency code (OFC) has been studied through simulations and the results are in good agreement with the theory.