In this paper, we consider a cellular network assisted
by fixed relay stations (RS), which are used by mobile stations
(MS) to access the base station (BS) via a relaying strategy,
namely Amplify-and-forward (AF) and Compress-and-forward
(CF). We analyze the achievable sum-of-rates for uplink communications.
It is assumed that mobile signals and relay signals
are emitted on orthogonal bands, with the possibility of having
a larger bandwidth (BW) on the relay-to-base links. Our key
result is that with a relay bandwidth just twice that of the
mobile’s bandwidth, the system capacity approaches that of an
ideal distributed antenna system (DAS), while the ideal DAS
requires new backhaul links with very high capacity. Moreover,
with the successive interference cancellation (SIC) decoder at
the BS, it is shown that under certain conditions the fairness
performance in terms of minimum user rates achieved by relayassisted
cellular systems is the same as that of an ideal DA
