无线电通信技术
無線電通信技術
무선전통신기술
RADIO COMMUNICATIONS TECHNOLOGY
2011年
6期
23-27
,共5页
SC—FDE%帧结构%独特字%噪声方差估计
SC—FDE%幀結構%獨特字%譟聲方差估計
SC—FDE%정결구%독특자%조성방차고계
SC-FDE%frame structure%unique word （UW）%estimation of noise variance
论述了单载波频域均衡（Single Carrier—Frequency Domain Equalization，SC—FDE）系统模型，介绍了频域选择性信道模型，在传统的信道估计算法基础上，利用导频信号的时移特性，对一种改进的信道估计算法进行了分析。无论信噪比（Signalto Noise Ratio，SNR）及导频类型如何变化，该算法能得到2．1dB的均方误差（Mean Square Error，MSE）性能提升。提出一种噪声方差的估计算法，当数据块达到30时，方差的估计跟理论很接近，且独立于信道估计误差。仿真表明，改进的算法也能适应时变信道。
論述瞭單載波頻域均衡（Single Carrier—Frequency Domain Equalization，SC—FDE）繫統模型，介紹瞭頻域選擇性信道模型，在傳統的信道估計算法基礎上，利用導頻信號的時移特性，對一種改進的信道估計算法進行瞭分析。無論信譟比（Signalto Noise Ratio，SNR）及導頻類型如何變化，該算法能得到2．1dB的均方誤差（Mean Square Error，MSE）性能提升。提齣一種譟聲方差的估計算法，噹數據塊達到30時，方差的估計跟理論很接近，且獨立于信道估計誤差。倣真錶明，改進的算法也能適應時變信道。
논술료단재파빈역균형（Single Carrier—Frequency Domain Equalization，SC—FDE）계통모형，개소료빈역선택성신도모형，재전통적신도고계산법기출상，이용도빈신호적시이특성，대일충개진적신도고계산법진행료분석。무론신조비（Signalto Noise Ratio，SNR）급도빈류형여하변화，해산법능득도2．1dB적균방오차（Mean Square Error，MSE）성능제승。제출일충조성방차적고계산법，당수거괴체도30시，방차적고계근이론흔접근，차독립우신도고계오차。방진표명，개진적산법야능괄응시변신도。
The model of single carrier-frequency domain equalization is described. The frequency-selective channel is introduced. On the basis of traditional estimation algorithms, an improved channel estimation algorithm is analyzed by utilization of the time-shift property of the pilot signal. No matter how signal-to-noise ratio and pilot type vary, the improved estimation algorithm can achieve about 2. ldB performance gain for mean square error. In addition, a noise variance estimation algorithm is proposed. When the number of the data blocks reaches 30, the variance estimation approximates the theoretical value and is independent of the channel estimation errors. The simulation shows the improved estimation algorithm can also adapt to the time-variable channel.
