NDLI: A distributed layered modulation for relay downlink cooperative transmission

Content Provider	IEEE Xplore Digital Library
Author	Yan Meng Mingli You Shengjie Zhao Lu Zhang
Copyright Year	2010
Description	Author affiliation: Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd, China (Yan Meng; Mingli You; Shengjie Zhao; Lu Zhang)
Abstract	In downlink relay systems, the conventional straightforward relaying scheme named decode-and-forward (DF) protocol is used at relay station (RS) to decode the data received from base station (BS) and forward the decoded data to the mobile station (MS) to improve the spatial diversity gain. However, conventional DF mode is spectral inefficient and not capacity optimal since the wireless channels in BS-to-RS, BS-to-MS, and RS-to-MS links are asymmetric, i.e., different channel qualities are obtained in different links in the practical scenario. In this paper, a distributed layered-modulation scheme is proposed to improve the DF mode performance in the presence of asymmetric links. With this proposed scheme, BS and/or RS transmit/re-transmit a layered modulated signal comprising a higher-order and a lower-order modulation components according to the different channel conditions in BS-to-RS and RS-to-MS links, respectively, and, therefore, the channel capacity of each link can be utilized efficiently. In addition, a two-layer demodulation is proposed at the destination by exploiting the two copies of transmitted packet from BS and RS, respectively. In order to further enhance the decoding performance, a soft combining method, in which the bit Log Likelihood Ratio (LLR) of the signals that received during the broadcast phase and the relaying phase are combined before turbo decoding, is used at MS receiver. Simulation results show that the proposed distributed layered modulation scheme obtains a significant performance gain in terms of block error rate (BLER) compared to the existing DF relaying scheme.
Starting Page	1
Ending Page	5
File Size	528954
Page Count	5
File Format	PDF
ISBN	9781424480173
e-ISBN	9781424480166
DOI	10.1109/PIMRC.2010.5671595
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-26
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase shift keying Relays Decoding Signal to noise ratio Diversity methods Receivers Soft Combining Relay Cooperative Communication Layered Modulation
Content Type	Text
Resource Type	Article

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