Title :
The Simple Near-Optimal Pairing Scheme of Superposition Coding in Downlink DS-CDMA Multi-path Channel
Author :
Eom, Seungyeon ; Yang, Janghoon ; Kim, Dong Ku
Author_Institution :
Yonsei Univ., Seoul
Abstract :
The paring scheme of superposition coding (SC) is developed to increase the user capacity in downlink DS-CDMA on multi-path channel. Unlike the previous work on frequency flat fading channel, the inter-user interference in the same SC and interference from other orthogonal codes are considered in selecting a pair of users for SC and evaluating their power allocation. We first examine the maximum supportable signal to interference and noise power ratio (SINR) and introduce the simple pairing scheme which offers nearly the same capacity with the same transmit power as the optimum pairing but requires far less computational complexity.
Keywords :
channel coding; code division multiple access; communication complexity; interference; multipath channels; orthogonal codes; radio links; wireless channels; computational complexity; downlink DS-CDMA multipath channel; frequency flat fading channel; near-optimal pairing scheme; noise power ratio; orthogonal code; power allocation; signal-to-interference; superposition coding; Bandwidth; Downlink; Equations; Fading; Frequency; Interference; Multiaccess communication; Multipath channels; Power system modeling; Signal to noise ratio;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487385
