分布式OFDMA系统中叠加导频的低复杂度信道估计

Mikko Hiivala, I. Harjula, M. Lasanen
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引用次数: 2

摘要

在多输入多输出(MIMO)系统中,对正交导频集的需求随着发射天线的数量呈线性增长。当前WiMAX和LTE等系统中使用的基于多路导频子载波的信道估计器消耗分配给数据传输的带宽。在信道估计精度不能以牺牲最大数据速率为代价的情况下,将导频叠加到数据子载波上的方法为信道估计提供了一个很好的解决方案。本文研究了在分布式多天线传输系统中使用叠加导频进行信道估计的概念,提出了适合硬件实现的简单、低复杂度算法。与传统的多路导频系统比较了系统的复杂性和性能。误码率(BER)仿真结果表明,在多达四个发射天线的自适应高数据速率系统中,叠加导频可以达到可容忍的性能。
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Low-complexity channel estimation for superimposed pilots in distributed OFDMA systems
In multiple-input multiple-output (MIMO) systems, the requirement for orthogonal pilot sets grows linearly with the number of transmit antennas. The channel estimators based on multiplexed pilot subcarriers used in the current systems such as WiMAX and LTE consume bandwidth allocated for data transmission. An alternative approach based on superimposing the pilots onto the data subcarriers offers a good solution for channel estimation in systems where the maximum data rate can not be sacrificed for the cost of channel estimation accuracy. The concept of using superimposed pilots for channel estimation in a distributed multiple antenna transmission system is studied here with simple and low-complexity algorithms suitable for hardware implementation. The complexity and performance of the system are compared with a conventional multiplexed pilot system. The bit error rate (BER) simulation results demonstrate that superimposed pilots can be used to achieve tolerable performance in adaptive high-data rate systems with up to four transmitting antennas.
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