Multiuser Receiver Scheme with SIC for PUCCH in High Speed Train Environment

Wei Wang,Guangliang Ren

doi:10.4236/cn.2013.53b2057

Abstract

A multiuser receiver scheme with successive interference cancellation (SIC) is proposed to suppress multiuser interference for physical uplink control channel (PUCCH) in high speed train (HST) environment. In the proposed algorithm, each user’s signal is detected iteratively in a descending order according to the signal strength at eNB. During each iteration, the strongest signal of all users’ is detected and regenerated, and then is subtracted from the composite signal before decoding the next user. Simulation results show that the proposed scheme obtains remarkable gains, e.g. 2 dB for PUCCH format 2 with 3 users in HST scenario 1. The improvement is more pronounced in the case of increasing number of users, e.g. 3.3 dB with 6 users.

Highlights

physical uplink control channel (PUCCH) is an important narrow-band channel, which carries the uplink control information, such as acknowledge/non-acknowledge (ACK/NACK) bits, downlink channel quality indicator (CQI), scheduling request, precoding matrix indicator (PMI), rank indication (RI) and HARQ-ACK feedback information, and it requires much higher transmission quality than the other channels
Simulation results show that the proposed scheme obtains remarkable gains, e.g. 2 dB for PUCCH format 2 with 3 users in high speed train (HST) scenario 1
Several literatures have been focused on the scheme of the PUCCH multiuser receiver in the low mobility scenario

Summary

Introduction

PUCCH is an important narrow-band channel, which carries the uplink control information, such as acknowledge/non-acknowledge (ACK/NACK) bits, downlink channel quality indicator (CQI), scheduling request, precoding matrix indicator (PMI), rank indication (RI) and HARQ-ACK feedback information, and it requires much higher transmission quality than the other channels. The received signal strength at eNB from near users is higher than that from the far ones, and users’ power differs greatly, which makes the multiuser interference severe. In this case, the performance of the parallel-receiver is degraded due to the poor performance of the farther users. The proposed scheme can greatly suppress the interference of the strong on the weak and is robust to the number of users, increasing the system capacity. It has lower complexity and is suitable for implementation.

System Model

Proposed Scheme

Simulation Results

Conclusions