衰落信道中峰值FSK信令的分集分析
Diversity Analysis of Peaky FSK Signaling in Fading Channels
摘要：
分析了衰落信道下多天线接收机中OOFSK调制非相干检测的误码性能。针对两种情况进行分析：1）接收器仅具有信道分布知识的情况;以及2）接收器完全知道衰落幅度的情况。对于这两种情况，推导了最大后验概率（MAP）检测规则，并得到了错误概率的解析表达式。数值和仿真结果表明，对于足够低的占空比值，实现了较低的错误概率相对于FSK信令。同样地，当与FSK调制相比时，具有低占空比的OOFSK需要更少的能量来实现相同的错误概率，这使得该调制成为更节能的传输技术。同时，通过数值计算，分析了天线数目、天线相关性、占空比和未知信道衰落对系统性能的影响。
英文摘要：
Error performance of noncoherent detection of on-off frequency shift keying (OOFSK) modulation over fading channels is analyzed when the receiver is equipped with multiple antennas. The analysis is conducted for two cases: 1) the case in which the receiver has the channel distribution knowledge only; and 2) the case in which the receiver perfectly knows the fading magnitudes. For both cases, the maximum a posteriori probability (MAP) detection rule is derived and analytical probability of error expressions are obtained. Numerical and simulation results indicate that for sufficiently low duty cycle values, lower error probabilities with respect to FSK signaling are achieved. Equivalently, when compared to FSK modulation, OOFSK with low duty cycle requires less energy to achieve the same probability of error, which renders this modulation a more energy efficient transmission technique. Also, through numerical results, the impact of number of antennas, antenna correlation, duty cycle values, and unknown channel fading on the performance are investigated.
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