Partial-Response Maximum-Likelihood Joint Detection of Asynchronous Tracks
Partial-Response Maximum-Likelihood Joint Detection of Asynchronous Tracks
复制标题
异步轨迹的部分响应最大似然联合检测
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
J. Barry
中科院分区：
文献类型：
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作者：
E. Sadeghian;J. Barry
磁记录中单道检测的行业标准是部分响应均衡，然后是基于网格的序列检测器。我们首次将部分响应范例扩展到多磁道检测的情况，当联合检测的多个磁道以不同的比特相位和比特率被异步写入时。我们提出了一种多输入多输出(MIMO)部分响应均衡器，它将多个回读波形的非同步样本均衡到时变的MIMO目标，从而使得基于所得到的时变目标的基于网格的序列检测器能够考虑到异步。我们在二维磁记录通道上对所提出的均衡策略进行了评估，发现所提出的接收器的性能优于一次检测一个磁道的传统接收器，并且与磁道完全同步的虚拟系统的性能非常接近。
The industry standard for single-track detection in magnetic recording is partial-response equalization followed by a trellis-based sequence detector. We extend for the first time the partial-response paradigm to the case of multitrack detection when the multiple tracks being jointly detected were written asynchronously, with different bit phases and bit rates. We propose a multiple-input multiple-output (MIMO) partial-response equalizer that equalizes the unsynchronized samples of the multiple readback waveforms to a time-varying MIMO target, thereby enabling a trellis-based sequence detector that is based on the resulted time-varying target to account for the asynchrony. We evaluate the proposed equalization strategy on a two-dimensional magnetic-recording channel, and find that the proposed receiver outperforms a conventional receiver that detects one track at a time, and that it closely matches the performance of a fictitious system in which the tracks are perfectly synchronous.