Abstract
This paper deals with the application of Hybrid Automatic Repeat reQuest
(H-ARQ) techniques to reliable data communications in wireless 3G
networks, whose typical applications have to match accurate Quality
of Service (QoS) requirements. A common approach to guarantee such
services enhances the H-ARQ features by exploiting turbo codes error
correction capabilities. This paper, following the previous approach,
investigates the further benefits achieavable by developing a strategy
that estabilishes a connection between packet retransmissions and
decoding results. Two kind of these techniques, belonging to soft
recombining schemes, are proposed and applied, respectively, to consecutive
received packet replicas, or to decoding algorithm outputs, in both
cases, without remarkable hardware complexity increase. By means
of analytical derivations and simulations, focused on a typical Universal
Mobile Telecommunication System (UMTS) environment, a noticeable
Bit Error Rate (BER) and, then, Frame Error Rate (FER) improvements
have been shown. For the proposed schemes, whenever communications
suffer from low Signal to Noise Ratio (SNR) values, a significant
link throughput increase is also pointed out. As a consequence, these
techniques can assure a lower packet delivery delay, besides to avoiding
transmitted power wasting, if compared with protocols commonly used
in wired networks.
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