| 摘要: |
| 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。 |
| 关键词: 功率受限通信系统 直接序列扩频 连续相位调制 准恒包络 相干解调 |
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| A new method of quad-system continuous phase modulation |
| ZHOU Xing-jian,ZHANG Jian,LU Jian-chuan |
| () |
| Abstract: |
| 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 certain time. At the receiver, a coherent linear receiver can be applied as that of quadrature phase shift keying(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 spectrum efficiency make it suit for application in nonlinear and power limited environments. |
| Key words: power limited communication system direct sequence spread spectrum continuous phase modulation quasi constant envelope coherent demodulation |
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