三分之一连续相位调频键控

1/3 continues phase chirp keying

摘要:

提出了一种具有高能量集中度的新型数字调制技术——1/3连续相位调频键控(1/3 Continuous Phase Chirp Keying,1/3-CPCK)．1/3-CPCK采用分段式线性调频信号作为已调信号波形样本,且已调信号相位连续、频率平滑过渡,具有较高的能量集中度,可在相对较窄的带宽内实现高速数字通信．建立1/3 CPCK调制的数学模型,分析其已调信号波形样本的相似度,及高斯白噪声条件下基于1/3-CPCK调制和相干解调的数字通信系统的误码率性能．理论推导和仿真实验证明:1/3 CPCK已调信号时域波形平滑、能量高度集中;在绝对带限情况下,当频带利用率为1 bps/Hz,信噪比为13.5 dB时,选择合适的调制系数,可使系统误码率达10-4．

Abstract:

1/3 continues phase chirp keying（1/3-CPCK）is proposed as a new narrow-band digital modulation scheme. 1/3-CPCK employs sectional type chirp signal as modulated signal waveform samples, of which the phase is continuous, the frequency is smooth and the energy is highly concentrated. This technique can be used in narrower band for high-speed data communication. The mathematical model of 1/3-CPCK is set up in this paper, the similarity of modulated signal waveform samples is analyzed, and the BER performance under AWGN based on coherent demodulation is presented. Theoretical derivation and simulation indicates that the waveform of 1/3-CPCK modulated signal is smooth and it has high energy concentration. When transmission bandwidth is absolutely limited, bandwidth efficiency is 1 bps/Hz and E_b/N₀ is 13.5 dB, BER of 1/3-CPCK Communication system can reach 10-4 by setting proper modulation factor.