Chapter: Analog and Digital Transmission Section: Spread Spectrum
contributed by Jack Glas, Lucent.
This section describes the BER performance of a hybrid Direct-Sequence Frequency-Hopping Spread Spectrum Communication System which applies the 16-FSK modulation technique. The derivation will be done using the WISSCE system definition as an example. We will first focus on the different phenomena that cause a degradation of the Signal to Noise Ratio (SNR) before despreading at the input of the A/D converter (pre-detection SNR). Thereafter we address the relation of this pre-detection SNR with the BER in the case of a static channel and multi-path channels. How the FH hit-chance and so the choice of Frequency-Hopping sequences influences the BER is described separately.