这周学习网络通信.
串口
asynchronous 异步
- TWI
- USI
- software
- library
SPI library
OSI layers
- 7: application 应用 (HTTP)
- 6: presentation 表现层 (SSL)
- 5: session 会话 (RPC)
- 4: transport 传输 (TCP, UDP)
- 3: network 网络 (IP)
- 2: data link 数据链路 (MAC)
- 1: physical 物理层 (PHY)
物理介质
capacity: bandwidth * log_2 (signal/noise)
-
wired
single-ended, differential, powerline open collector, open drain transmission (pass) gate, tri-state transmission line waveguide TIA RS232, 422, 485 802.3 ethernet chip module SONET optical fiber -
wireless
modulation 调制
- PCM: Pulse-Code Modulation 脉冲编码调制
- PPM: Pulse-Position Modulation
- OOK: On-Off Keying 通断键控
- FSK: Frequency-Shift Keying 频移键控
- BPSK: Binary Phase-Shift Keying 二进制相移键控
- QAM: Quadrature Amplitude Modulation 求积分振幅变调
- OFDM: Orthogonal Frequency-Division Multiplexing 正交频分多路
- FHSS: Frequency-Hopping Spread Spectrum 跳频扩频
- DSSS: Direct-Sequence Spread Spectrum 直接序列扩频
- UWB: Ultra-WideBand 超宽带
channel sharing 信道共享
ALOHA
Master-Slave
Token Ring
TDMA: Time-Division Multiple Access 时分多址
FDMA: Frequency-Divsion Multiple Access 频分多址
-
CSMA: Carrier-Sense Multiple Access 载波监听
- CD: Collision Detection
- CA: Collision Avoidance
- 1-persistent: transmit when clear
- nonpersistent: random backoff
- p-persistent: probability to transmit
CDMA: Code-Division Multiple Access 码分多址
MIMO: Multiple-Input Multiple-Output 多输入多输出
PDMA": Physical-Division Multiple Access
errors 错误
- detection, correction
- block, convolution codes
- parity, checksum, Hamming, Reed-Solomon, Turbo
networking 网络
RF 射频
- radios: oscillator, mixer, PA, LNA, IF, I/Q, demod, baseband, filters
- antennas: Q, antenna gain, impedance matching
- single-chip
- MICRF (300-470 MHz)
- MRF49XA (433/868/915 MHz)
- nRF905 (433/868/915 MHz)
- nRF24L01+ (2.4 GHz ISM)
- CC2541 (2.4 GHz Bluetooth)
- ESP8266 (2.4 GHz Wi-Fi)
- software radio
