NDLI: Superposition Coding with Unequal Error Protection for the Uplink of Overloaded DS-CDMA System

Content Provider	Springer Nature Link
Author	Tahir, Yaseen H. Ng, Chee Kyun ordin, r K. Ali, Borhanuddin Mohd. Khatun, Sabira
Copyright Year	2011
Abstract	The overloaded CDMA schemes exploited in direct sequence CDMA (DS-CDMA) systems are mainly to accommodate a greater number of users than the available spreading factor N. In this paper, a superposition coding CDMA (SPC-CDMA) with unequal error protection (UEP) is proposed as one of the overloaded CDMA schemes for the next generation mobile communication systems. It exploits the available power control in most base stations to adapt the transmitted power of active users in the uplink channel. In this scheme, the active users are divided into G groups and each group consists of K users. The K users share the same spreading sequence and are distinguished by different received power levels. At the receiver side, the system first performs despreading for group detection followed by multiuser receiver to estimate the K user signals in each group. It is shown through simulations that better performance are achieved compared to the conventional DS-CDMA and existing overloaded collaborative spreading CDMA (CS-CDMA) schemes, in additive white Gaussian noise (AWGN) and fading channels. Hence, the proposed scheme maximizes the system capacity K-fold compared to conventional DS-CDMA system without requiring extra spreading codes, with average signal to noise ratio (SNR) cost of only 1dB and 2 dB over AWGN and fading channels respectively at BER of 10$^{−3}$. On the other hand, for the same N, K and power constraints, SPC-CDMA scheme achieves twofold increase in data rate with 0.7 and 4 dB gains over AWGN and fading channels respectively, compared with overloaded CS-CDMA scheme in the same system capacity. In addition, the proposed scheme can also attain different levels of UEP for different users’ requirements by adjusting their fractions of transmitted powers.
Starting Page	567
Ending Page	582
Page Count	16
File Format	PDF
ISSN	09296212
Journal	Wireless Personal Communications
Volume Number	65
Issue Number	3
e-ISSN	1572834X
Language	English
Publisher	Springer US
Publisher Date	2011-03-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Overloaded CDMA Superposition coding Multiuser receiver Successive interference cancellation UEP Computer Communication Networks Signal, Image and Speech Processing Communications Engineering, Networks
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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