Performance enhancement of E-UTRA uplink control channel in fast fading environments

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Executive Summary

Hybrid Automatic Repeat reQuest (HARQ) is employed for the 3GPP Evolved Universal Terrestrial Radio Access (E-UTRA) downlink. Each User Equipment (UE) sends its ACK/NACK corresponding to the downlink data reception to the base station via a Physical Uplink Control CHannel (PUCCH). The ACK/NACK signals from the UE are first code spread by the cyclic shift sequences, and then spread by the orthogonal cover sequences. In this paper, the authors propose a novel PUCCH code design which can suppress the effect of inter-code interferences among the orthogonal cover sequences. And the simulation evaluations confirm that the proposed code design can significantly improve the performance of the ACK/NACK signals via PUCCH especially in fast-fading environments.

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