Performance Analysis of DS-CDMA Receiver in Presence of Partial Band Jamming

Abstract

Direct Sequence Code Division Multiple Access (DS-CDMA) is a multiple access technique that differentiates between different users by assigning unique spreading codes to them. It is widely used in communication systems because of its great bandwidth efficiency and its multiple access capabilities. DS-CDMA signals are resistant to multipath fading. Since the spread spectrum signal occupies a large bandwidth, only a small portion of this signal will undergo fading due to multipath at any given time. Moreover, DS-CDMA can also effectively reject narrowband interference, since narrowband interference affects only a small portion of the spread spectrum signal. In this paper, the performance of a DS-CDMA system is investigated in presence of multiple-access interference (MAI) and an additive white Gaussian noise (AWGN) under the presence of partial band jamming. Two types of receivers are proposed, single user matched filter receiver (SUMF) and decorrelator receiver.

Integration of Reinforcement Learning and Unreal Engine for Enemy Containment via Autonomous Swarms

“…Additionally, the implementation of spread-spectrum modulation -using the existing CDMA scheme to spread the signal over multiple frequency bands -would significantly harden our networks against "jamming" attacks. [20] The network currently operates using unreliable transport -callbacks to facilitate Automatic Repeat Request-based (ARQ) reliable transport are necessary for the guaranteed delivery of important messages. Additionally, the addition of error-correcting codes to correct, as well as detect bit-level errors are necessary upon the introduction of a "noisy" channel to minimize re-transmissions.…”

Performance of Direct Sequence Spread Spectrum System (DSSSS) in Presence of Single and Multi Tone Jamming

“…In this paper three values of spreading factor or processing gain will be introduce with both types of jamming (STJ and MTJ), because of the effect of jamming signal is reduced by processing gain [10,11]. Also the jammer will need extreme power to overcome the processing gain when the processing gain is large enough [6,7].…”

“…Figure.9:Frequency spectrum of DS transmitted signal under the effect of MTJ for J/S=10dB and tone.The results in the presence of MTJ for three cases of J/S are presented in Fig (10)…”