Performance and characteristics of GSM-based PCS

Abstract

PCS based on the GSM system, also called PCS1900, provides an advanced wireless system concept with a high performance air interface. The combination of techniques such as frequency hopping, equalization, channel coding and spatial diversity help in controlling the hostile radio environment. In this paper, the performance mainly in terms of coverage and capacity is evaluated and compared with PCS based onThe results show a coverage advantage for GSM-based PCS (PCS1900) corresponding to fewer required base stations than for IS-95 CDMA. The reason is the large frequency diversity possible to achieve with PCS1900.The capacity in terms of channelskector is comparable for the two systems. When using the same speech coder rate, PCS1900 will have a small capacity advantage. The important concept of Hierarchical Cell Structures to get really high system capacity per km2 in a flexible way, is only supported by PCS1900.IS-95 CDMA.

Outage evaluation for slow frequency-hopping mobile radio systems

“…In the following, the results are carried out for an FH system employing MSK with coherent detection, a RS (12,6,3) on code [7] interleaved over six hops such that the number of symbols per hop is (i.e., 16 bits/hop). We have checked that both for uplink and downlink, the performance is strongly dependent on the shadowing and the propagation exponent with special regard to the interference effects.…”

“…The "outage" is represented by the opposite situation. By taking into account the variability of path loss and shadowing (due to different user's position within the serving cell 1 ), it is possible to evaluate the "outage probability," that is (6) So, from an "area coverage" point of view, can be interpreted as the area fraction where whereas is the area served with acceptable quality. As far as the PC strategy is concerned, we assume that the transmitter adapts its power to maintain constant the average (with respect to rapidly changing fading) received power.…”

“…Downlink without PC, 120 sectorization, with = 6 dB, = 4,and N sh = 2: Circle: two-branch MRC antenna diversity. RS(12,6,3), MSK.…”