载频估计的文章

Kittyeen

【文件名】:06522@52RD_ation for Transmissionsover Selective Channels.rar
【格　式】:rar
【大　小】:259K
【简　介】:Abstract—This paper deals with carrier-frequency estimation
for burst transmissions over frequency-selective channels. Three
estimation schemes are proposed, all based on the use of known
training sequences. The first scheme employs an arbitrary sequence
and provides joint maximum-likelihood (ML) estimates of the carrier frequency and the channel response. Its implementation complexity is relatively high but its accuracy achieves the Cramer–Rao bound. The second scheme is still based on the ML criterion, but the training sequence is periodic, which
helps to reduce the computational load. The third scheme also employs periodic sequences, but its structure comes from heuristic reasoning. Theoretical analysis and simulations are employed to assess the performance of the three schemes.
【目　录】:
I. INTRODUCTION
II. SIGNAL MODEL
III. ML FREQUENCY ESTIMATION
IV. PERFORMANCE OF THE MLE#1
VI. AD HOC FREQUENCY ESTIMATION
VII. SIMULATION RESULTS
VIII. CONCLUSIONS

Kittyeen

【文件名】:06522@52RD_cation to Transmissions With Antenna Diversity.rar
【格　式】:rar
【大　小】:268K
【简　介】:Abstract—A new data-aided frequency estimator for frequencyselective fading channels is introduced. The proposed estimator is
developed based on a least squares (LS) error criterion and can estimate
frequency offsets without the need for channel information.Statistical analysis indicates that the resulting estimate is unbiased and tends to approach the Cramér–Rao lower bound (CRLB). Simulation shows that the proposed LS method is preferable to existing techniques in mobile communications. The application of the LS estimator to systems with transmitter antenna diversity is also considered. In particular, it is demonstrated that the LS method
can be successfully applied to third-generation wireless communication
systems [1].
【目　录】:
I. INTRODUCTION
II. COMMUNICATION SYSTEM MODEL
III. LEAST SQUARES FREQUENCY OFFSET ESTIMATION
IV. PERFORMANCE ANALYSIS
V. APPLICATION TO FREQUENCY-SELECTIVE FADING CHANNELS
VI. APPLICATION TO TRANSMISSIONS WITH ANTENNA
VII. CONCLUSION
DIVERSITY