电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2012年
1期
27-32
,共6页
OFDM%载波间干扰抑制%多符号差分检测%最大似然序列估计
OFDM%載波間榦擾抑製%多符號差分檢測%最大似然序列估計
OFDM%재파간간우억제%다부호차분검측%최대사연서렬고계
OFDM%intercarrier interference suppression%multiple-symbol differential detection%maximum likelihood sequence estimation
为抑制多符号差分检测(MSDD)OFDM系统中的载波间干扰(ICI),分析了载波间干扰的统计性影响,并在最大似然序列估计过程中考虑了这些影响.提出了通过在最大似然序列估计过程中利用全部子载波信号的信息估计并抑制载波间干扰的方法.为降低计算复杂度,进一步提出了几种利用部分子载波信号信息的次优载波间干扰抑制法.仿真结果表明:所提出的次优方法在平坦及频率选择性瑞利信道中均可显著提高误码率性能.
為抑製多符號差分檢測(MSDD)OFDM繫統中的載波間榦擾(ICI),分析瞭載波間榦擾的統計性影響,併在最大似然序列估計過程中攷慮瞭這些影響.提齣瞭通過在最大似然序列估計過程中利用全部子載波信號的信息估計併抑製載波間榦擾的方法.為降低計算複雜度,進一步提齣瞭幾種利用部分子載波信號信息的次優載波間榦擾抑製法.倣真結果錶明:所提齣的次優方法在平坦及頻率選擇性瑞利信道中均可顯著提高誤碼率性能.
위억제다부호차분검측(MSDD)OFDM계통중적재파간간우(ICI),분석료재파간간우적통계성영향,병재최대사연서렬고계과정중고필료저사영향.제출료통과재최대사연서렬고계과정중이용전부자재파신호적신식고계병억제재파간간우적방법.위강저계산복잡도,진일보제출료궤충이용부분자재파신호신식적차우재파간간우억제법.방진결과표명:소제출적차우방법재평탄급빈솔선택성서리신도중균가현저제고오마솔성능.
To suppress the intercarrier interference(ICI)in multiple-symbol differential detection(MSDD)orthogonal frequency division multiplexing(OFDM)systems,statistical effects of ICI are analysed and then considered in the maximum likelihood sequence estimation(MLSE)process.Afterwards,a method,which can estimate and suppress the ICI by utilizing the knowledge of all the subcarriers in the MLSE process,is proposed.To reduce the computational complexity,several suboptimal ICI suppression methods,which utilize the knowledge of part of the subcarriers,are further proposed.Simulation results show that the proposed suboptimal methods can significantly enhance the bit error rate(BER)performances in both flat and frequency selective Rayleigh fading channels.
