上行功率域非正交多址(NOMA):考虑信道估计误差的误码率性能

Faeik T. Al Rabee, R. Gitlin
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引用次数: 5

摘要

为了满足第五代(5G)通信的要求,并通过实现大规模连接、高吞吐量和低延迟来增强物联网(IoT)网络的性能,非正交多址(NOMA)已被提出作为一种有前途的多址(MA)技术。在考虑信道估计误差的情况下,研究了具有连续干扰消除(SIC)接收机的双用户上行功率域NOMA的误码率性能。该分析考虑了两种情况:完美(理想)信道估计和各种调制方案(BPSK, QPSK和16-QAM)的估计误差信道。仿真结果表明,调制电平越大,SIC接收机的误码率越高。例如,在完美信道估计和QPSK调制的5 dB信噪比(SNR)下,首先检测到的用户的误码率为0.005,而借助SIC接收器检测到的用户的误码率为0.14。同样,假设用户1的信道估计误差为0.25,在信噪比为15 dB时,QPSK的误码率为0.06,而在完美估计时为0.017。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Uplink Power-Domain Non-Orthogonal Multiple Access (NOMA): Bit Error Rate Performance With Channel Estimation Errors
Non-orthogonal multiple access (NOMA) has been proposed as a promising multiple access (MA) technique in order to meet the requirements for fifth generation (5G) communications and to enhance the performance in internet of things (IoT) networks by enabling massive connectivity, high throughput, and low latency. This paper investigates the bit error rate (BER) performance of two-user uplink power-domain NOMA with a successive interference cancellation (SIC) receiver and taking into account channel estimation errors. The analysis considers two scenarios: perfect (ideal) channel estimation and a channel with estimation errors for various modulations schemes, BPSK, QPSK, and 16-QAM. The simulation results show that, as expected, increasing of the modulation level increases the SIC receiver BER. For example, at a signal-to-noise ratio (SNR) of 5 dB for perfect channel estimation and QPSK modulation, the user that is detected first has a BER of 0.005 compared to 0.14 for the user that is detected with the aid of the SIC receiver. Similarly, the BER of QPSK, assuming 0.25 channel estimation error of user 1, is equal to 0.06 at SNR = 15 dB compared to 0.017 for perfect estimation.
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