Non-uniform sampling point selection in orthogonal frequency division multiplexing receiver with fractional sampling
Non-uniform sampling point selection in orthogonal frequency division multiplexing receiver with fractional sampling
复制标题
DOI：
10.1049/iet-com.2010.0693
复制
发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
H. Nishimura;M. Inamori;Y. Sanada;M. Ghavami
中科院分区：
文献类型：
--
作者：
H. Nishimura;M. Inamori;Y. Sanada;M. Ghavami
为了用单天线实现分集，提出了OFDM中的分数采样（FS）方案。FS以更高的采样率和多个解调分支实现路径分集。在以往的文献中，FS的采样间隔是固定的，即使已经研究了采样的初始相位选择。固定采样间隔限制了通过FS的分集增益。因此，在这项研究中，非均匀采样点的选择方案，根据信道的频率响应。计算机仿真结果表明，当解调支路数为2时，该方案可使系统的误码率性能提高约2 dB。虽然该方案进一步提高了误比特率（BER）性能，但它需要更大的速率和更多的计算复杂度来选择采样点。因此，采样点选择的复杂性降低也进行了研究。复杂度降低方案消除了特定的采样点集，并将所提出的方案的采样点选择的计算复杂度降低了2倍。计算机仿真也表明，所提出的方案的低复杂度版本，甚至达到了相同的BER相比，原来提出的方案。
To achieve diversity with a single antenna, a fractional sampling (FS) scheme in OFDM has been proposed. FS achieves path diversity with a higher sampling rate and multiple demodulation branches. In the previous literatures for FS, the sampling interval is fixed even though the initial phase selection of the sampling has been investigated. The fixed sampling interval limits the diversity gain through FS. Thus, in this study, a non-uniform sampling point selection scheme according to the frequency response of a channel is proposed. Numerical results through computer simulation show that the proposed scheme improves the BER performance by about 2 dB when the number of the demodulation branches is 2. While the proposed scheme further improves bit error rate (BER) performance it requires a larger rate and more computational complexity for the selection of the sampling points. Therefore the complexity reduction for the sampling point selection is also investigated. The complexity reduction scheme eliminates the specific sets of the sampling points and reduces the computational complexity of the sampling point selection for the proposed scheme by a factor of 2. Computer simulation also shows that the low complexity version of the proposed scheme even achieves the equivalent BER compared to the original proposed scheme.