CAJ | 학술논문

与OFDM系统相比，在OFDM／OQAM系统中，通过实数域的正交设计，虽然会提高系统的频谱效率，但同步精度与信道估计性能极易受到虚部干扰的影响，恶化系统性能。针对此问题，提出了一种改进的OFDM／OQAM多径信道环境下联合频偏与信道估计算法。该算法基于帧头的已知前导序列，通过简化对数似然函数，得到了信道冲激响应以及载波频偏的最大似然估计，有效地解决了多径衰落信道环境下的OFDM／OQAM系统频偏估计和信道参数（幅度、相位以及时延）估计难题，并通过蒙特卡罗仿真，验证了算法的有效性。
여OFDM계통상비，재OFDM／OQAM계통중，통과실수역적정교설계，수연회제고계통적빈보효솔，단동보정도여신도고계성능겁역수도허부간우적영향，악화계통성능。침대차문제，제출료일충개진적OFDM／OQAM다경신도배경하연합빈편여신도고계산법。해산법기우정두적이지전도서렬，통과간화대수사연함수，득도료신도충격향응이급재파빈편적최대사연고계，유효지해결료다경쇠락신도배경하적OFDM／OQAM계통빈편고계화신도삼수（폭도、상위이급시연）고계난제，병통과몽특잡라방진，험증료산법적유효성。
Compared with OFDM techniques,the OFDM/OQAM system is designed according to the orthogonality conditions in real number field.Although the system spectrum efficiency is improved,the performance of synchronization and channel estimation is susceptible to the imaginary interference, degrading the system performance. Aiming at this problem, a joint carrier frequency offset (CFO)and multi?path channel parameter estimation algorithm is introduced.Based on the known preamble symbols at the frame head, the maximum likelihood( ML) estimation of channel impulse response and the carrier frequency offset are derived by simplifying the likelihood function.The performance of the algorithm is verified by the Monte Carlo simulations.