Research On The Design Of Complementary Sequence And Complementary Sequence Set With Low PMEPR

Communication technology is developing at an unprecedented rate,multicarrier communication technology also play an irreplaceable role in communication technology.Multicarrier technology has the absolute advantages and more applications,because it can improve spectrum utilization,resist frequency selective fading,also have anti-interference ability.But the drawback of multicarrier communication is the transmitted signals have a high value of Peak-to-Mean Envelope Power Ratio(PMEPR).It may drive the transmitter front-end circuits into saturation,leading to nonlinear distortion of the receiving signal and reducing the transmission efficiency.This paper solve this problem by construct complementary sequence or complementary sequence set with low PMEPR through the coding method,it can be used in multicarrier communication technology as spread spectrum sequence.First of all,based on the Golay-Davis-Jedwab(GDJ)sequences,which is present by Davis and Jedwab,we propose a construction of complementary sequence,it have been proved this kind of complementary sequence is Hadamard matrix when it arranged as a matrix,using this kind of complementary sequence combing with two kinds of operation techniques,we can get complete complementary code and zero correlation zone aperiodic complementary sequence set.When complementary sequence in sequence set is arranged as complementary matrix,the PMEPR of column sequence is at most 2.Secondly,based on the mapping method of three Quadrature Phase Shift Keyin(QPSK)can get a 64-QAM symbol,we present three kinds of nonlinear offsets,combing three kinds of mapping methods,a series of 64-QAM almost complementary sequences can be obtained,whose PMEPR is at most 2.72.Thirdly,based on quaternary and the phase relationship of 16-QAM,we present three kinds of interleaving techniques,using quaternary complementary sequence set as basic sequence,we can get a series of 16-QAM complementary sequence set with different parameters.The methods not only can be used in aperiodic complementary sequence set,but also can be used in periodic complementary sequence set.So it can enlarge the number of 16-QAM complementary sequence sets.