Effects of a Phase Rotation Scheme on the DTX Detection Performance for the E-UTRA Uplink ACK/NACK Signals
| Autor: | Daichi Imamura, Katsuhiko Hiramatsu, Tomohumi Takata, Seigo Nakao |
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| Rok vydání: | 2011 |
| Předmět: |
Computer Networks and Communications
Computer science Code division multiple access Automatic repeat request Real-time computing Hybrid automatic repeat request Base station Transmission (telecommunications) User equipment E-UTRA Telecommunications link Bit error rate Electrical and Electronic Engineering Software |
| Zdroj: | IEICE Transactions on Communications. :262-272 |
| ISSN: | 1745-1345 0916-8516 |
| DOI: | 10.1587/transcom.e94.b.262 |
| Popis: | Hybrid automatic repeat request (HARQ) is employed for the Evolved Universal Terrestrial Radio Access (E-UTRA) downlink. The base station not only decodes the ACK/NACK signals from the user equipment (UE), but also detects a termination of the transmission (DTX) of the ACK/NACK signals caused by the mis-detection of the downlink control information (DCI) at the UE side. Since ACK/NACK signals from UEs are multiplexed by CDMA, there are sometimes severe inter-code interference (ICI) effects, which significantly degrade the performance of ACK/NACK signals. In order to mitigate such ICI effects, in [1],[2], we proposed a novel phase rotation scheme on the constellations of the uplink ACK/NACK signals, and confirmed the effects on the ACK/NACK bit error rate performance; however, the previous paper did not analyze the effects of the phase rotation on the DTX detection performance. Hence, in this paper, we further analyze the effects of the phase rotation for the ACK/NACK signals in conjunction with a new DTX detection scheme which utilizes equalizer outputs, and investigate the performance of the proposed scheme by means of computer simulations. |
| Databáze: | OpenAIRE |
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