The objective of modulation classification is to offer the demodulation reference to receiver in the absence of any knowledge of given signal. 调制识别的目的在于,在缺乏先验知识的条件下,由给定信号的特征判定其调制方式,为接收端进一步解调提供依据。
Security tokens can be " pushed," or carried, in a message, or expressed by a reference so the receiver can " pull " the claim from the authority. 安全令牌可以“推送到”消息中或者在消息中携带安全令牌,也可以通过引用表示安全令牌,以便接收方从授权机构“拉取”该声明。
Frequency offset between the received carrier and local reference at the receiver may occur due to Doppler shifts and / or oscillator instabilities after down conversion in digital communication system. 在数字通信系统中,由于接收机振荡器的不稳定性和多普勒频移等因素,使得接收信号的载波与发送信号载波之间存在频率偏差,经过相干解调下变频后得到的基带信号中通常含有载波频率偏移。
Strictly speaking, it is not correct to refer to proxy mode services as deployments of existing services; there is no explicit reference to the ultimate receiver when a proxy mode service is set up. 严格来说,把代理模式服务作为现存服务的部署是不正确的,因为当代理模式服务被设置时,没有对最终接收者的引用。
Aiming at the coherent disadvantage of transmitted reference ( TR ) receiver, a new TR-UWB ( ultra-wideband ) receiver design scheme for low-data-rate wireless personal area network ( WPAN ) is proposed. 针对发送-参考(TR)接收机噪声影响较敏感的缺点,提出一种适用于低速率无线个域网的新型超宽带(UWB)TR接收机设计方案。