Efficient random multiple-access using iterative interference cancelation receivers
Efficient random multiple-access using iterative interference cancelation receivers
复制标题
使用迭代干扰消除接收机的高效随机多址接入
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
C. Schlegel
中科院分区：
文献类型：
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作者：
Lukas Grinewitschus;C. Schlegel
详细研究了一种用于aloha型随机接入的异步多分组多用户接收机在高密度多址卫星系统中的应用。通过在卫星集线器上应用多分组接收器，可以避免传输的协调。这种集线器接收器不同于最近标准化的分集开槽ALOHA协议，因为它通过迭代干扰消除（IIC）接收器算法在PHY协议层执行流量分离。虽然IIC的原则在理论上已经很好地建立起来了，但实际的例子很少，并且面临着许多需要克服的实现挑战。典型的信道损伤，如载波和时钟频率偏移，以及信道多普勒效应进行了研究。介绍了用户专用的频域均衡器以及用于相互信号抵消的精确重构滤波器。讨论了接收机的软件实现，并将其用于量化系统性能，与理论极限进行了比较。
An asynchronous multi-packet multiple user receiver for ALOHA-type random access is detailed and examined for application in high-density multiple-access satellite systems. Coordination of transmissions is avoided by applying a multi-packet receiver at the satellite hub. This hub receiver differs from the recently standardized Diversity Slotted ALOHA protocols in that it executes traffic separation at the PHY protocol layer via an iterative interference cancelation (IIC) receiver algorithm. While principles of IIC are well established in theory [4], [5], practical examples are rare, and face numerous implementation challenges that need to be overcome. Typical channel impairments, such as as carrier and clock frequency off-sets, as well as channel Doppler effects are investigated. User-specific frequency-domain equalizers as well as accurate reconstruction filters for the mutual signal cancelation are introduced. A software implementation of the receiver is discussed and used to quantify system performance which is compared with theoretical limits.