Asymmetrical Modulation for Uplink Communication in Cooperative Networks

Zhang, Qi; Fitzek, Frank H. P.; Iversen, Villy Bæk

doi:10.1109/iccw.2008.21

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…In [6], [7], this unequal error protection technique has been generalized to the relay channel. The idea of sending additive information to the relay using the second layer of a HM has been proposed in [8]. However the authors considered a broadcast channel with two non-cooperative receivers, and thus did not exploit the diversity of the wireless channel.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical modulation-based cooperative scheme: Minimizing the symbol error probability

Hucher

Sadeghi

2010

2010 17th International Conference on Telecommunications

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In a cooperative network, relays are often closer to the source than the destination and thus the source-relay links have a higher capacity than the source-destination one. In this paper, we investigate a hierarchical modulation-based cooperative scheme, where the relay is able to detect the whole signal, while the destination can only detect the rst layer of the modulation. We provide an error probability upper-bound for this scheme, which allows us to optimize the choice of the constellation parameter θ.

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Section: Introductionmentioning

confidence: 99%

Hierarchical modulation-based cooperative scheme: Minimizing the symbol error probability

Hucher

Sadeghi

2010

2010 17th International Conference on Telecommunications

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Wireless Communication Technologies

Fitzek

Katz

2013

Mobile Clouds

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On iterative decoding of two-level superposition codes for cooperative broadcasting based on QPSK and 4-PAM constellations

Morelos-Zaragoza

2010

2010 - Milcom 2010 Military Communications Conference

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Abstract-This paper considers iterative decoding of twolevel superposition codes used in cooperative broadcasting over wireless networks. The coding scheme consists of two low-density parity-check (LDPC) codes combined using Plotkin's |u|u + v|-construction and provides two levels of error protection. Coding for cooperative broadcasting differs from conventional singlesource broadcast coding. Instead of binary addition of subcode codewords performed by a single-source encoder, in superposition coding two modulated subcode sequences, produced by two coordinated and independent sources, are combined at the antenna of the receiver. Expressions are derived for the bit metrics, or log-likelihood ratio values, used by an iterative decoder for twolevel superposition coding schemes based on BPSK, QPSK and 4-PAM modulated sequences. It is shown that conventional equalenergy 4-PAM constellations do not work well with two-level superposition coding. A solution is proposed in which 4-PAM constellations of different levels of average energy are used.

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Asymmetrical Modulation for Uplink Communication in Cooperative Networks

Cited by 4 publications

References 11 publications

Hierarchical modulation-based cooperative scheme: Minimizing the symbol error probability

Hierarchical modulation-based cooperative scheme: Minimizing the symbol error probability

Wireless Communication Technologies

On iterative decoding of two-level superposition codes for cooperative broadcasting based on QPSK and 4-PAM constellations

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