Bluetooth Spec For Phy - Infineon AIROC CYW20829 Bluetooth LE SoC Manual

r e s t r i c t e d
Achieving long range transmission using AIROC™ CYW20829
Bluetooth® LE SoC
Long range application
2.1 Bluetooth® spec for PHY
The Bluetooth® technology is a full protocol stack. The bottom layer of this stack is called the Physical Layer
and is normally referred to as PHY.
Bluetooth® 5 adds two new PHY variants to the PHY specification, compared to the previous version. Each PHY
variant has its own particular characteristics and is designed with specific objectives. The three PHYs, LE 1M, LE
2M, and LE Coded, are referenced in specifications.
LE 1M is the PHY used in Bluetooth® 4 and earlier versions. It uses Gaussian Frequency Shift Keying (GFSK) and
has a symbol rate of 1 Msps. Higher up the stack, this correlates to a bit rate of 1 Mbps since one symbol
corresponds to one data bit. LE 1M continues to be available for use in Bluetooth® 5 and in fact, its support is
mandatory.
The new LE 2M PHY allows the physical layer to operate at 2 Msps and thus enables higher data rates than LE
1M. Its support in a Bluetooth® chip is optional.
The LE Coded PHY allows the range to be quadrupled (approximately), compared with Bluetooth® 4, and this is
achieved without increasing the required transmission power.
Figure 2 Bluetooth® architecture diagram
Application note
APPS
Applications
HOST
Generic Access Profiles
Generic Attribute Profiles
Attribute Protocols
Logical Link Control & Adaption Protocol
Host Controller Interface
Link Layer
Physical Layer (PHY)
CONTROLLER
Security Manager
Direct Test Mode
5 002-38518 Rev. **
2023-09-12