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Link Adaptation for Relay-Based Cellular Networks (Hardcover)
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Link Adaptation for Relay-Based Cellular Networks (Hardcover)
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Cover Text Link Adaptation for Relay-Based Cellular Networks
focuses on the implementation of various link adaptation methods in
OFDM(A) (Orthogonal Frequency Division Multiplexing/Multiple
Access)?Time Division Duplex (TDD) based two-hop cellular networks.
The analysis and design consider infrastructure based relays. New
link adaptive transmission methods which dynamically select the
channel coding, modulation, forwarding, relaying mechanisms and the
packet size have been designed and evaluated for such networks. The
selection among various schemes is based on maximizing the
end-to-end throughput. This book provides a channel adaptive
scheduler which considers the multiplexing loss caused by the
two-phase nature of wireless relaying. The scheduler dynamically
schedules the users on the frequency-time radio resources with
efficient Modulation and Coding Schemes (MCS)s selected by Adaptive
Modulation and Coding (AMC). Relaying is used only if it can
provide throughput enhancement. The guidelines for efficient
deployment of infrastructure based relay terminals are given. For
the two-hop cellular communication systems, the system level
performance of various cooperative diversity schemes has been
investigated with the scheduler developed and the relays
efficiently deployed in the cell. This investigation for low
mobility scenarios shows that, a simple cooperative diversity
scheme that dynamically chooses the best scheme among direct
transmission and two-hop conventional relaying is a promising
choice when compared to various more complex cooperative diversity
schemes. In this book, a hop adaptive Medium Access Control
(MAC)-Protocol Data Unit (PDU) size optimization is proposed for
wireless relay networks. With this proposal, the MAC-PDU size in
different hops can be different and it is optimized based on the
channel condition of each hop. Such optimization improves the
end-to-end goodput via MAC-PDU size optimization. The proposal
further reduces the total overhead transmitted in the end-to-end
path via transmitting longer length packets in the potentially
robust Base Station (BS)?to?Relay Station (RS) links. The time and
carrier frequency offset issues and the hardware complexity of
various cooperative diversity scheme implementations are
investigated for the MS. The investigations show a significant
complexity increase with the cooperative diversity schemes which
require coherent signal combining at the MS. Hence, coherent signal
combining at the MS should be used if there is a throughput gain.
Content * Introduction * Background on Cooperative Communications
and the Systems Considered * Link Adaptation and Selection Method
for OFDM Based Wireless Relay Networks * Cooperative Diversity
Schemes and User Scheduling with Fixed Relays for IEEE 802.16j *
Hop Adaptive MAC-PDU Size Optimization for Infrastructure Based
Wireless Relay Networks * Implementation Issues for OFDM(A) Based
Wireless Relay Networks * Conclusions and Future Work
General
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