CAJ | 학술논문

为简化连续相位调制信号的相干解调，提出了一种四进制连续相位调制方法。在发送端，信号调制器根据发送的前后两组比特信息从一个预先设计的基带信号集合中选择对应的基带信号作为调制信号。该调制方法使信息码元由基带信号某一时刻的绝对相位值表示，当完成相位和载波同步后，在接收端其接收处理和传统QPSK信号一致，可以直接使用IQ路的采样值解调信息比特。仿真表明，调制信号的相干解调误比特性能与QPSK信号的相干解调相同。由于调制信号具有准恒包络和连续相位的特点，更适合应用于使用非线性功放的功率受限通信系统中。
위간화련속상위조제신호적상간해조，제출료일충사진제련속상위조제방법。재발송단，신호조제기근거발송적전후량조비특신식종일개예선설계적기대신호집합중선택대응적기대신호작위조제신호。해조제방법사신식마원유기대신호모일시각적절대상위치표시，당완성상위화재파동보후，재접수단기접수처리화전통QPSK신호일치，가이직접사용IQ로적채양치해조신식비특。방진표명，조제신호적상간해조오비특성능여QPSK신호적상간해조상동。유우조제신호구유준항포락화련속상위적특점，경괄합응용우사용비선성공방적공솔수한통신계통중。
This paper proposes a method of quad-system continuous phase modulation ( CPM ) to simplify the coherent CPM receiver. Transmitter chooses the sending signal from a baseband signal set based on the consecutive information bits,which makes the information be carried by the received signal phase at a cer-tain time. At the receiver, a coherent linear receiver can be applied as that of quadrature phase shift ke-ying ( QPSK ) . The simulation demonstrates that the proposed method achieves the same bit error rate ( BER) performance as that of QPSK. The CPM's properties of quasi constant envelope and the high spec-trum efficiency make it suit for application in nonlinear and power limited environments.