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Based on the principle of Orthogonal Time Frequency and Space (OTFS) modulation, this paper designs an OTFS waveform scheme based on Zero Suffix (ZP) protection. Methods of synchronization, channel estimation, and the detection algorithm based on delay-time domain Maximum Ratio Combining (MRC) are presented, and the MRC detection algorithm is simplified. Hardware implementation schemes of channel interpolation and the MRC detector are given. And the Field Programmable Gate Array(FPGA)hardware implementation of the proposed OTFS system waveform is carried out to verify the feasibility of the key algorithms of the designed OTFS system. Test results show that the designed OTFS system has good performance in resisting doubly selective fading.
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在研究正交时频空(Orthogonal Time Frequency and Space,OTFS)调制原理基础上设计了一种基于零后缀(Zero Suffix,ZP)保护的OTFS波形方案。提出了同步、信道估计方法和基于时延-时域最大比合并(Maximum Ratio Combining,MRC)的检测算法并对该算法进行了化简;给出了信道插值和MRC检测器硬件实现方案并对提出的OTFS系统波形进行了现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA)硬件实现,验证了所设计OTFS系统关键算法的可行性。测试结果表明,所设计OTFS系统具有良好的抗双选择性衰落性能。
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4(6):11-15., articleTitle=无线OFDM系统中基于导频信道估计方法的性能比较, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1251895525008683095, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, xref=null, ext=[AuthorCompanyExt(id=1251895525017071704, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, companyId=1251895525008683095, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=The 54th Research Institute of CETC, Shijiazhuang 050081, China), AuthorCompanyExt(id=1251895525021266009, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, companyId=1251895525008683095, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中国电子科技集团公司第五十四研究所,河北 石家庄 050081)])], figs=[ArticleFig(id=1251895527344910574, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 1, caption=
OTFS modulation and demodulation block diagram, figureFileSmall=1t7SBQBH+tUmut9oI7NRBw==, figureFileBig=8K1sHu0FhT6d1J3nYa8KBw==, tableContent=null), ArticleFig(id=1251895527449768181, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图1, caption=
OTFS调制和解调框图, figureFileSmall=1t7SBQBH+tUmut9oI7NRBw==, figureFileBig=8K1sHu0FhT6d1J3nYa8KBw==, tableContent=null), ArticleFig(id=1251895527596568827, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 2, caption=
Transmit symbol arrangement, figureFileSmall=uvjhcm3cB0JU0G9gi/ApWg==, figureFileBig=DHZLAHLtgdDwf8J+N+cyCA==, tableContent=null), ArticleFig(id=1251895527676260608, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图2, caption=
发送符号图案示意, figureFileSmall=uvjhcm3cB0JU0G9gi/ApWg==, figureFileBig=DHZLAHLtgdDwf8J+N+cyCA==, tableContent=null), ArticleFig(id=1251895527776923910, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 3, caption=
Block structure of the OTFS, figureFileSmall=cwm97VZIyJ6zJW2ae/XZdA==, figureFileBig=rvQSeKexKDYAf9TLn5lU7A==, tableContent=null), ArticleFig(id=1251895529345593613, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图3, caption=
OTFS块结构, figureFileSmall=cwm97VZIyJ6zJW2ae/XZdA==, figureFileBig=rvQSeKexKDYAf9TLn5lU7A==, tableContent=null), ArticleFig(id=1251895529454645521, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 4, caption=
Frame structure of the OTFS, figureFileSmall=ICVV0B5qVBN6DMC69yAppg==, figureFileBig=jqo+jvAYlzAXzNBT26sSuA==, tableContent=null), ArticleFig(id=1251895529551114521, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图4, caption=
OTFS帧结构, figureFileSmall=ICVV0B5qVBN6DMC69yAppg==, figureFileBig=jqo+jvAYlzAXzNBT26sSuA==, tableContent=null), ArticleFig(id=1251895529676943650, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 5, caption=
Structure of the frame head, figureFileSmall=HUVBkoYY3b6+hpwAy2QeLQ==, figureFileBig=LhifIkrbJzYWBX1bucSuOw==, tableContent=null), ArticleFig(id=1251895529773412648, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图5, caption=
帧头结构, figureFileSmall=HUVBkoYY3b6+hpwAy2QeLQ==, figureFileBig=LhifIkrbJzYWBX1bucSuOw==, tableContent=null), ArticleFig(id=1251895529920213295, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 6, caption=
Hardware implementation block diagram of time-domain MRC iterative detector, figureFileSmall=ht0vikhTERIPeXbRxEJ52w==, figureFileBig=TDjprNC0m4LJBUMsOAL06w==, tableContent=null), ArticleFig(id=1251895529999905077, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图6, caption=
时域MRC迭代检测器硬件实现框图, figureFileSmall=ht0vikhTERIPeXbRxEJ52w==, figureFileBig=TDjprNC0m4LJBUMsOAL06w==, tableContent=null), ArticleFig(id=1251895530067013944, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 7, caption=
Timing simulation diagram of Ping-Pang control, figureFileSmall=+jeSXgBlRcpglZGKE+z05g==, figureFileBig=rN2ya7nK2g4eJEJ447LjRg==, tableContent=null), ArticleFig(id=1251895530159288638, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图7, caption=
乒乓控制时序仿真, figureFileSmall=+jeSXgBlRcpglZGKE+z05g==, figureFileBig=rN2ya7nK2g4eJEJ447LjRg==, tableContent=null), ArticleFig(id=1251895530268340545, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 8, caption=
Timing simulation diagram of channel response interpolation, figureFileSmall=tbRHQ4J1tO+Xu+Ml2YxxlQ==, figureFileBig=r2Uq6BBIdWOUKCKCB/t7Ng==, tableContent=null), ArticleFig(id=1251895530385781063, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图8, caption=
信道插值控制时序仿真, figureFileSmall=tbRHQ4J1tO+Xu+Ml2YxxlQ==, figureFileBig=r2Uq6BBIdWOUKCKCB/t7Ng==, tableContent=null), ArticleFig(id=1251895530494832969, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 9, caption=
FPGA resource utilities of hardware implementation, figureFileSmall=XJGejSpJCmDMk4hyvOKvDQ==, figureFileBig=EDZmE7c+C++YsSCzsJeLNQ==, tableContent=null), ArticleFig(id=1251895530591301963, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图9, caption=
硬件实现资源占用情况, figureFileSmall=XJGejSpJCmDMk4hyvOKvDQ==, figureFileBig=EDZmE7c+C++YsSCzsJeLNQ==, tableContent=null), ArticleFig(id=1251895530683576655, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Fig. 10, caption=
OTFS system BER performance in channel emulator testing, figureFileSmall=9z4JlLCxrl3jTVKbSus4Lw==, figureFileBig=ZIiRfQcAMLRuQJOsI3A3fA==, tableContent=null), ArticleFig(id=1251895530788434262, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=图10, caption=
OTFS系统BER实测性能, figureFileSmall=9z4JlLCxrl3jTVKbSus4Lw==, figureFileBig=ZIiRfQcAMLRuQJOsI3A3fA==, tableContent=null), ArticleFig(id=1251895530931040603, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Tab. 1, caption=
OTFS system parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 含义 | 取值 |
|---|
| OTFS符号速率Rs/(Ms/s) | 20.48 |
| OTFS帧时长T/ms | 10 |
| 多普勒域分组数N | 16 |
| 时延域符号数M | 256 |
| 时延域有效数据符号数M′ | 224 |
| 零保护符号长度LZP | 32 |
| 每信道编码块信息比特数Lk | 4 512 |
| 每信道编码块码长Ln | 7 168 |
| 信道交织OTFS块数Ic | 7 |
| 单载波帧头时长Tf/μs | 200 |
| 帧头符号速率Rf/(Ms/s) | 10.24 |
| 升余弦滤波器滚降因子α | 1 |
| OTFS符号过采样率LO | 4 |
| 单载波帧头过采样率LF | 8 |
), ArticleFig(id=1251895531136561509, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=表1, caption=
OTFS系统参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 含义 | 取值 |
|---|
| OTFS符号速率Rs/(Ms/s) | 20.48 |
| OTFS帧时长T/ms | 10 |
| 多普勒域分组数N | 16 |
| 时延域符号数M | 256 |
| 时延域有效数据符号数M′ | 224 |
| 零保护符号长度LZP | 32 |
| 每信道编码块信息比特数Lk | 4 512 |
| 每信道编码块码长Ln | 7 168 |
| 信道交织OTFS块数Ic | 7 |
| 单载波帧头时长Tf/μs | 200 |
| 帧头符号速率Rf/(Ms/s) | 10.24 |
| 升余弦滤波器滚降因子α | 1 |
| OTFS符号过采样率LO | 4 |
| 单载波帧头过采样率LF | 8 |
), ArticleFig(id=1251895531228836203, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
|
|---|
输入: ,∀m=0,1,…,M′-1 |
| for m=0:223 do |
 |
| end |
| for i=1:2 do |
 |
| for m=0:223 do |
 |
| for |
 |
| end |
| end |
| end |
输出: |
), ArticleFig(id=1251895531295945070, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=算法1, caption=
软判决时域MRC检测算法
, figureFileSmall=null, figureFileBig=null, tableContent=
|
|---|
输入: ,∀m=0,1,…,M′-1 |
| for m=0:223 do |
 |
| end |
| for i=1:2 do |
 |
| for m=0:223 do |
 |
| for |
 |
| end |
| end |
| end |
输出: |
), ArticleFig(id=1251895531388219762, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=EN, label=Tab. 2, caption=
Comparison of overall complexity of three OTFS detectors
, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | 复杂度 |
|---|
| LMMSE | O(NM3+NMlb N) |
| MP | O(niterNM′SQ),niter≤20 |
| MRC | O(niterNM′(2|L|+1)),niter=2 |
), ArticleFig(id=1251895531463717237, tenantId=1146029695717560320, journalId=1251234473337991274, articleId=1251893505342259619, language=CN, label=表2, caption=
3种OTFS检测器复杂度比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 算法 | 复杂度 |
|---|
| LMMSE | O(NM3+NMlb N) |
| MP | O(niterNM′SQ),niter≤20 |
| MRC | O(niterNM′(2|L|+1)),niter=2 |
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