P. Karunakaran, P. Suryasarman, Vinod Ramaswamy, K. Kuchi, Deviraj Klutto Milleth Jeniston, B. Ramamurthi
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引用次数: 3
摘要
现代蜂窝网络具有固有的干扰限制，因此，导频设计对系统整体性能至关重要。为了跟踪衰落信道并有效地抑制干扰，必须对导频进行精心布置和调制。基于OFDMA的4G无线系统使用先导设计策略，可分为“数据先导”和“先导先导”。本文考虑了一种“导频空”方案，该方案使用零音和导频音来避免对导频的大部分干扰。详细讨论了这三个试验方案的各个设计方面。分析和比较了这些试验方案的信道估计、干扰协方差估计、不同干扰情况下的链路性能和系统吞吐量。结果表明，在利用MMSE干扰抑制接收机的后处理信噪比增益方面，常用的“导频数据”方案不如其他两种方法。“Null on Pilot”和“Pilot on Pilot”的性能非常相似。
On pilot design for interference limited OFDM systems
Modern cellular networks are inherently interference limited, and therefore, pilot design is extremely important to the overall system performance. The pilots have to be carefully arranged and modulated to track the fading channel as well as to suppress the interference efficiently. 4G wireless systems based on OFDMA use pilot design strategies that can be classified as ‘Data on Pilot’ and ‘Pilot on Pilot’. In this paper, a ‘Null on Pilot’ scheme that uses null tones and pilot tones to avoid most of the interference on the pilots is considered. Various design aspects of these three pilot schemes are discussed in detail. The channel estimation, interference covariance estimation, link performance with different interference profiles, and system throughput are analyzed and compared with these pilot schemes. It is shown that the popular approach of ‘Data on Pilot’ scheme is inferior to the other two approaches in exploiting the post-processing SNR gain of MMSE interference suppression receivers. The performances of ‘Null on Pilot’ and ‘Pilot on Pilot’ are quite similar.
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