Coded Error Probability Evaluation for Antijam Communication Systems

Abstract

Absrruct-We present a general union-Chernoffbound on the bit error probability for coded communication systems and apply it to examples of antijam systems.. The key feature of this bound is the decoupling of the coding aspects of the system from the remaining part of the communication system which includes jamming, suboptimum detectors, and arbitrary decoding metrics which may or may not use jammer state knowledge.

The use of coding and diversity combining for mitigating fading effects in a DS/CDMA system

“…Moreover, it is well known that in spread-spectrum systems, as CDMA systems are, the use of channel coding does not require additional allocation of bandwidth [7]. In case of using convolutional codes as well as decoders that work with soft decisions at their inputs, bounds on the BER may be obtained by resorting to the expression [8] (17) where (.) is a function determined solely by the specific code, whereas the parameter depends only on the coding channel and the decoder metric.…”

“…The use of this bound causes the parameter-appearance, which is related to the cutoff rate as follows [8]: (18) and is defined as…”

“…In particular, when selection diversity with antennas having the same signal-to-interference ratio for paths with identical delays is employed in a Rayleigh multipath channel, the expression of for coherent BPSK, which has been given in detail in Appendix C, is as follows: (22) where and are given by (6). On the other hand, when MRC is selected as form of diversity, the parameter can be expressed as (see Appendix D) (23) V. SYSTEM PERFORMANCE In order to illustrate the behavior of a space-diversity-based CDMA system according to the expressions obtained above and show how to assess the performance of such a system in a given environment, we have first computed from (8) and (15) the mean BER of a two-antenna diversity DS/CDMA cellular system in a Rayleigh multipath environment with the same statistics in both antennas. To compare the different diversity combining schemes, let us assume the power delay profile (PDP) of the channel to be exponential [11] and identical for any antenna (24) where denotes the delay spread of the channel.…”

A Study of the Bit Error Performance of Convolutional Coded Spread Spectrum Communication Systems

“…The above value of E,/N 0 has been used in the calculation of the computational cut-off rate reo for additive white Gaussian noise channel and is given by [9] {6)…”

Analysis of FH/MFSK Systems in Non-Uniform Rayleigh Fading Channels

“…In these examples we first compute the Bhattacharyya bound [2] on pairwise error probabilities. These are later used to derive cutoff rates and more general coding error bounds [3]. Our goal here is to apply a general analysis technique to nonuniform Rayleigh fading channels.…”