NDLI: Optimal rate profile for multi-user multi-rate transmission systems by bivariate fixed-point analysis

Content Provider	IET Digital Library
Author	He, Meilin Song, Guanghui Cheng, Jun
Abstract	A K-user multi-rate code is proposed for a Gaussian multiple access channel with binary inputs, equal-power, and symbol synchronisation. In this multi-rate transmission, K users are equally divided into M groups. For each user in the mth group, a rate- 1 / q m regular repeat-accumulate code serially concatenated with a length- L m spreading is employed. The transmitted rate of each user in the mth group is 1 / ( q m L m ) . At the receiver, iterative joint decoding (IJD) and hybrid interference cancellation (HIC) schemes are considered. For each decoding scheme, a bivariate fixed-point analysis is applied to explicitly represent ( q m , L m ) as a function of mutual information outputs. On the basis of these basic explicit representations, a united unreliable region is given, where users in at least one group are undecodable. The complementary set of the united unreliable region gives an optimal rate profile that achieves the maximum sum rate. Numerical results show that, for the IJD scheme with M increments, the maximum sum rate increases, approaches the Shannon limit, and exceeds that in conventional equal rate transmission. The maximum sum rate of the HIC scheme, which provides much lower decoding complexity than the IJD scheme, is superior to the conventional successive interference cancellation scheme.
Starting Page	628
Ending Page	638
Page Count	11
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 5, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2016.0694
Journal	IET Communications
Publisher Date	2016-11-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bivariate Fixed-point Analysis Channel Coding Code Concatenated Codes Conventional Equal Rate Transmission Decoding Complexity Electromagnetic Compatibility Explicit Representations Gaussian Channel Gaussian Multiple Access Channel HIC Scheme Hybrid Interference Cancellation Scheme IJD Interference Interference Suppression Iterative Decoding Iterative Joint Decoding K-user Multirate Code Length-Lm Spreading Maximum Sum Rate Multi-access System Multiple Access Communication Multiuser Multirate Transmission System Mutual Information Output Optimal Rate Profile Rate-1/qm Regular Repeat-accumulate Code Serial Concatenated Code Shannon Limit Successive Interference Cancellation Scheme Symbol Synchronisation Synchronisation United Unreliable Region
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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