Terminology » Other Wireless » CDPD vs. HomeRF: Key Differences in Wireless Communication

CDPD vs. HomeRF: Key Differences in Wireless Communication

wireless communication cdpd homerf mobile data rf technology

This article highlights the differences between CDPD (Cellular Digital Packet Data) and HomeRF wireless communication systems. Let’s dive into the specifics of each technology.

CDPD

CDPD, or Cellular Digital Packet Data, was an early mobile data technology. Here’s a breakdown of its characteristics:

  • Mobile Frequency: 869 to 894 MHz (receive), 824 to 849 MHz (transmit)
  • Duplex Scheme: FDD (Frequency Division Duplex)
  • Multiple Access Technique: FDMA (Frequency Division Multiple Access)
  • Number of Channels: 832
  • Number of Users per Channel: One
  • RF Channel Spacing: 30 kHz
  • Modulation Technique: GMSK (Gaussian Minimum Shift Keying) with a 0.5 Gaussian Filter
  • Channel Data Bit Rate: 19.2 Kbps

HomeRF

HomeRF was designed as a wireless networking technology for the home. Let’s explore its features:

  • Mobile Frequency:
    • 2402 to 2480 MHz (North America and Europe)
    • 2447 to 2473 MHz (Spain)
    • 2448 to 2482 MHz (France)
    • 2473 to 2495 MHz (Japan)
  • Duplex Scheme: TDD (Time Division Duplex)
  • Multiple Access Technique: Frequency Hopping
  • Number of Users per Channel: Eight active users
  • RF Channel Spacing: 1 MHz / 3.5 MHz
  • Modulation Technique: FHSS (Frequency-Hopping Spread Spectrum) with a 0.5 Gaussian Filter
  • Channel Data Bit Rate: 1 Mbps symbol rate, 1.6/10 Mbps