Pilot embedding for channel estimation and tracking in OFDM systems

Shankar Balasubramanian, B. Farhang-Boroujeny, V. J. Mathews
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引用次数: 14

Abstract

We consider the problem of channel estimation and tracking in OFDM systems and explore the idea of adding pilot symbols to the data symbols as a means of conserving bandwidth. The term pilot embedding (PE) is used to refer to this scheme. Compared to the pilot insertion (PI) scheme, i.e., the conventional pilot symbol assisted modulation (PSAM), PE is more bandwidth efficient since no separate subcarriers/timeslots are allocated to pilots. We formalize this by evaluating the capacity of the two schemes and showing that PE indeed has the potential to transmit at a higher rate. The problem of channel tracking using a decision directed approach is reviewed and found to be unreliable, in the sense that the channel estimator fails to track the channel variations after some iterations because of unavoidable decision errors. We propose an ad hoc channel estimation algorithm that uses the embedded pilots along with the past decisions of data for reliable tracking of the channel.
OFDM系统中信道估计与跟踪的导频嵌入
我们考虑了OFDM系统中的信道估计和跟踪问题,并探讨了在数据符号中添加导频符号作为节约带宽的一种方法。术语导频嵌入(PE)是指这种方案。与导频插入(PI)方案,即传统的导频符号辅助调制(PSAM)相比,PE具有更高的带宽效率,因为PE没有为导频分配单独的子载波/时隙。我们通过评估两种方案的容量并显示PE确实具有以更高速率传输的潜力来形式化这一点。对使用决策导向方法的信道跟踪问题进行了回顾,发现该方法不可靠,因为由于不可避免的决策错误,信道估计器在一些迭代后无法跟踪信道变化。我们提出了一种特别的信道估计算法,该算法使用嵌入式导频和过去的数据决策来可靠地跟踪信道。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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