Cellular Efficiency with Slow Frequency Hopping: Analysis of the Digital SFH900 Mobile System

Hybrid Automatic-Repeat-reQuest Systems for Cooperative Wireless Communications

“…Furthermore, SFHMA is capable of avoiding the problem of prolonged fades typically experienced by stationary or slow moving Mobile Stations (MS) because hopping to another independently faded frequency might curtail fading. The classic SFH900 mobile system [96,97] which was based on "mixed" Slow Frequency Hopping (SFH) combined with time division demonstrated the benefits of SFHMA.…”

“…This arrangement reduces the effects of cochannel interference and hence becomes capable of supporting a high number of users. As a benefit of providing an increased freedom in system design and of its improved spectral efficiency [96,97], the above-mentioned mixed protocol will be considered in the following sections.…”

“…2.23 for the SFHMA system detailed in [96,97]. Each colour is represented by one of the letters A, B, C and each contains a set of N c frequencies.…”

“…In this section, the method proposed in [11,97] will be employed for evaluating the ASE of the proposed STFSK aided SFHMA system. Furthermore, the spectral efficiency of the STFSK aided SFHMA, the GMSK aided SFHMA and the conventional GMSK aided TD/FDMA systems will be compared.…”

“…However, in order to facilitate reliable system synchronization, the target BER of 10 −3 is chosen in this study. The probability q c of correct reception of a hop may be formulated as [97]: 76) where γ presents the E b /N 0 value corresponding to the BER threshold and λ is the CIR at the receiver considered, where the interference is imposed by all the adjacent cells. Note that the CIR depends on the received power, on the shadowing and fast-fading parameters, as well as on the interference imposed by other cells in the network.…”