Title :
Turbo-coded ARQ schemes for DS-CDMA data networks over fading and shadowing channels: throughput, delay, and energy efficiency
Author :
Ji, Tingfang ; Stark, Wayne E.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
Modified ARQ (automatic-repeat-request) techniques based on turbo coding are investigated for asynchronous DS-CDMA (direct-sequence code-division multiple-access) data networks under shadowing and frequency selective fading channel conditions. The throughput, delay, and energy efficiency performance of standard ARQ, metric combining, and RCPT (rate compatible punctured turbo) coded ARQ schemes are compared via simulations. The RCPT/ARQ schemes are shown to outperform the other two schemes in terms of both throughput and energy efficiency at the cost of larger delay and complexity. In addition, maximum network throughput is investigated for different ARQ schemes under energy constraints.
Keywords :
automatic repeat request; cellular radio; code division multiple access; data communication; delays; fading channels; multipath channels; multiuser channels; packet radio networks; radio links; spread spectrum communication; telecommunication traffic; turbo codes; ARQ protocols; DS-CDMA data networks; RCPT/ARQ; asynchronous DS-CDMA; automatic-repeat-request; cellular systems; complexity; delay; direct-sequence code-division multiple-access; energy constraints; energy efficiency; frequency selective fading channel; maximum network throughput; metric combining; modified ARQ techniques; multipath fading; rate compatible punctured turbo coded ARQ; shadowing channels; simulations; standard ARQ; turbo coding; turbo-coded ARQ schemes; uplink traffic; Automatic repeat request; Code standards; Delay; Energy efficiency; Fading; Frequency; Multiaccess communication; Shadow mapping; Throughput; Turbo codes;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
