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Ergodic Capacity Comparison of Different Relay Precoding Schemes in Dual-Hop AF Systems With Co-Channel Interference
- Source :
- IEEE Transactions on Communications. 62:2314-2328
- Publication Year :
- 2014
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2014.
-
Abstract
- In this paper, we analyze the ergodic capacity of a dual-hop amplify-and-forward relaying system where the relay is equipped with multiple antennas and subject to co-channel interference (CCI) and the additive white Gaussian noise. Specifically, we consider three heuristic precoding schemes, where the relay first applies the 1) maximal-ratio combining (MRC) 2) zero-forcing (ZF) 3) minimum mean-squared error (MMSE) principle to combine the signal from the source, and then steers the transformed signal towards the destination with the maximum ratio transmission (MRT) technique. For the MRC/MRT and MMSE/MRT schemes, we present new tight analytical upper and lower bounds for the ergodic capacity, while for the ZF/MRT scheme, we derive a new exact analytical ergodic capacity expression. Moreover, we make a comparison among all the three schemes, and our results reveal that, in terms of the ergodic capacity performance, the MMSE/MRT scheme always has the best performance and the ZF/MRT scheme is slightly inferior, while the MRC/MRT scheme is always the worst one. Finally, the asymptotic behavior of ergodic capacity for the three proposed schemes are characterized in large $N$ scenario, where $N$ is the number of relay antennas. Our results reveal that, in the large $N$ regime, both the ZF/MRT and MMSE/MRT schemes have perfect interference cancelation capability, which is not possible with the MRC/MRT scheme.<br />Accepted, to appear in IEEE Transactions on Communications, 2014
- Subjects :
- FOS: Computer and information sciences
Information Theory (cs.IT)
Computer Science - Information Theory
Co-channel interference
Nonlinear Sciences::Cellular Automata and Lattice Gases
Topology
Precoding
Upper and lower bounds
Hop (networking)
law.invention
symbols.namesake
Additive white Gaussian noise
Single antenna interference cancellation
Relay
law
symbols
Electronic engineering
Ergodic theory
Electrical and Electronic Engineering
Computer Science::Information Theory
Mathematics
Subjects
Details
- ISSN :
- 00906778
- Volume :
- 62
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Communications
- Accession number :
- edsair.doi.dedup.....1aec1cd7e2f542383239bbb126cf564b