Massive MIMO为什么能提升5G容量？
Why does Massive MIMO boost 5G capacity?
基站在同一频段布设大量天线，用波束赋形把信号精确指向各用户并复用空间维度，从而在相同频谱下服务更多用户、提升吞吐。
The base station uses many antennas to beamform signals to each user and reuse space, serving more users and raising throughput on the same spectrum.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Rappaport《无线通信》；3GPP 5G 标准；Proakis《数字通信》
Rappaport, Wireless Communications; 3GPP 5G standards; Proakis, Digital Communications
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2462469W：Wireless communications
#通信 #5G
调制在通信里起什么作用？
What does modulation do in communications?
调制把要传的信息（语音、数据）加载到高频载波上，便于远距离辐射和频分复用，常见方式有调幅、调频和调相。
Modulation puts information onto a high-frequency carrier for efficient radiation and channel sharing, via amplitude, frequency or phase modulation.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Rappaport《无线通信》；3GPP 5G 标准；Proakis《数字通信》
Rappaport, Wireless Communications; 3GPP 5G standards; Proakis, Digital Communications
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2462469W：Wireless communications
#通信 #调制
光纤为什么能传那么远还不丢失信号？
Why can fiber carry signals so far without loss?
光在玻璃纤芯中靠全反射约束前进，优质石英光纤损耗极低（约0.2 dB/km），且不受电磁干扰，因此适合大容量长距离通信。
Light is guided by total internal reflection in the glass core; quality silica fiber loses only about 0.2 dB/km and is immune to electromagnetic interference, ideal for long-haul, high-capacity links.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Keiser《光纤通信》；Corning 光纤
Keiser, Optical Fiber Communications; Corning optical fiber
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780071007856 (2000)
#通信 #光纤