Abstract
In communications systems under jamming interference, it is customary to employ spread spectrum techniques to combat performance degradation. In systems with fading, spatial diversity techniques such as MIMO schemes are usually used to mitigate the problem. Here, we analyze and show the extremely severe effects on BER performance of the combined jamming signals and Rayleigh fading of a system undergoing both conditions at the same time. Then, we analyze and derive the performance of systems employing joint MIMO and complex spreading schemes to combat both Rayleigh fading and jamming and note the significant mitigation improvements.
Highlights
1.1 BackgroundIt is well known that performance in terms of bit error rate (BER) of a conventional communication system degrades severely in a fading environment
When orthogonal space-time block codes (OSTBC) and maximal ratio combining (MRC) are used for MIMO configuration, the diversity order is the L = LtLr, where Lr is the number of receiver antennas
It has been shown that the performance degradation is quite severe when both are present
Summary
It is well known that performance in terms of bit error rate (BER) of a conventional communication system degrades severely in a fading environment. Spatial diversity benefits are very well known [1,2] Both transmit and receive spatial diversities in terms of multiple-output-multiple-input (MIMO) techniques have shown to improve performances over fading channels. Spread spectrum technique as applied in both military for anti-jam and civilian systems for multi-user access such as code-division multiple access (CDMA) has a long history dating back from the famed actress Ms Hedy Lamarr, who along with a collaborator submitted the idea of SS in 1941. SS as a mitigation technique against jamming is a mature topic As such it is not possible to list every major contribution but the interested reader is referred to some excellent references from early to more recent works such as [15,16,17,18,19,20,21,22,23]
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