PERFORMANCE AND ECM VULNERABILITY ANALYSIS OF TROPOSCATTER MULTICHANNEL DATA TRANSMISSION SYSTEMS.
Abstract
The performance of generic troposcatter multichannel data transmission systems using frequency modulation is evaluated on the basis of a time- and frequency-selective fading mathematical model for the channel. Frequency-division multiplexing (FDM-FM) and time-division multiplexing (TDM-FM) are considered in the generic system model. The channel is modeled as a zero-mean, time-varying, Gaussian random field which includes both additive distortions and random dispersive effects introduced by the scatter channel. For the TDM-FM generic system, equations are developed for the probability of error for operation with no diversity and with predetection-combining dual diversity. Error-rate curves are presented showing the signal-to-noise and multipath limitations on systems performance. Extensions to higher-order diversity systems are indicated. The vulnerability to ECM in terms of the probability of error, as well as antijamming strategies, are considered in a separate, classified volume (Vol. II). For the FDM-FM generic system a signal-to-distortion ratio within the received baseband is obtained. From these results the probability of error for particular modems can be obtained when the channel scattering is the primary limitation. A frequency-shift-keying data modem is used as a typical example. Performance improvement through the use of an iterative block code and a feedback channel is considered. The throoughput rate is evaluated for independent errors and for burst errors, as a function of the channel binary error rate. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0487249
Entities
People
- Bruce M. Sifford
Organizations
- SRI International