Emulation and Validation of a 4G System Proposal.
Karlstand University and
Radiovetenskap och Kommunikation
Linköping, Sweden, June 14-16 2005.
The Swedish Wireless IP project studies
problems that are crucial in the evolution of UMTS towards high
data rates, as well as in future 4G technologies aimed at
rapidly mobile terminals. The goal is to attain higher
throughputs for packet data in particular in downlinks,
bandwidth expansion and while providing acceptable
quality of service for various classes of traffic.
This paper presents a wireless link and network emulator,
along with experiments and validation against the "Wire less IP"
4G system proposal from Uppsala University and
In wireless fading downlinks (base to terminals) link-level
frames are scheduled and the transmission is adapted on a
fast time scale. With fast link adaptation and fast link level
retransmission, the fading properties of wireless links can to
a large extent be counteracted at the physical and link layers.
The emulator has been used to experimentally investigate
the resulting interaction between the transport layer and the
The paper gives an overview of the emulator design, and
presents experimental results with three different TCP
variants in combination with various link layer characteristics.
Paper 1 at VTC2003,
on adaptive modulation, multiuser diversity
and channel variability within bins.
Paper 2 at VTC2003,
on the OFDM downlink and cell planning for high SIR.
Paper 3 at VTC2003,
on OFDM downlink channel estimation and channel prediction.
Paper 4 at VTC2003,
on the impact of prediction errors on the adaptive modulation.
An overview of the Wireless IP Project (RVK02)
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