5 词条
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2G wireless network
Second-generation (2G) digital cellular networks used by mobile phones. 2G networks was developed as a replacement for first generation (1G) analog cellular networks, and the GSM standard originally described a digital, circuit-switched network optimized for full duplex voice telephony. This expanded over time to include data communications, first by circuit-switched transport, then by packet data transport via GPRS (General Packet Radio Services) and EDGE (Enhanced Data rates for GSM Evolution or EGPRS).
2G wireless network的贡献者
2G wireless network
电源连续工作能力
移动通信; 2G wireless network
对配备基地电台的电源，指电源在额定输出电压条件下能满载连续工作的时间。对配备车（船）载式电台的电源，指电源在额定输出电压条件下，能以额定电流工作1min，30%额定电流工作3min．按此循环连续工作的时间。 ...
混合扩频
移动通信; 2G wireless network
将多种基本扩频方法彼此结合起来，以提高系统综合性能的扩频方式。如跳频(FH)与直扩(DS)相比，抗近台干扰的能力较好，但抗多径干扰和截获窃听的能力较差，采用FH-DS混合扩频，就可兼顾各种性能，而且处理增益是FH与DS两种处理增益之积，比单独一种扩频技术的效果要好。 ...
