Preliminary Data Sheet
6/30/09
BCM4325
ADAPTIVE FREQUENCY HOPPING
The BCM4325 gathers link quality statistics on a channel by channel basis to facilitate channel assessment and channel
map selection. The link quality is determined using both RF and baseband signal processing to provide a more accurate
frequency-hop map.
ADVANCED BLUETOOTH/WLAN COEXISTENCE
The BCM4325 includes advanced coexistence technologies that are only possible with a Bluetooth/WLAN integrated die
solution. These coexistence technologies are targeted at small form factor platforms such as cell phones and media players,
including applications such as VoWLAN + SCO and Video-over-WLAN + High-Fidelity BT stereo. Support is provided for
platforms that share a single antenna between Bluetooth and 802.11g. Dual antenna applications are also supported. The
BCM4325 radio architecture allows for lossless simultaneous Bluetooth and WLAN reception for shared antenna
applications. This is possible only via an integrated solution (shared LNA and joint AGC algorithm). It has superior
performance versus implementations that need to arbitrate between Bluetooth and WLAN reception.
The BCM4325 integrated solution enables MAC-layer signaling (firmware) and a greater degree of sharing via an enhanced
coexistence interface. The Packet Traffic Scheduler (PTS) can suitably schedule future packet transmissions (versus merely
supporting arbitration on a packet-by-packet basis as employed in discrete Bluetooth/WLAN solutions) and can factor in
beacon arrival times, duration of upcoming packet transmissions, etc. Information is exchanged between the Bluetooth and
WLAN cores without host processor involvement.
The BCM4325 also supports Transmit Power Control (TPC) on the STA together with standard Bluetooth TPC to limit mutual
interference and receiver desensitization. Preemption mechanisms are utilized to prevent AP transmissions from colliding
with Bluetooth frames. Improved channel classification techniques have been implemented in Bluetooth for faster and more
accurate detection and elimination of interferers (including non-WLAN 2.4 GHz interference).
FAST CONNECTION (INTERLACED PAGE AND INQUIRY SCANS)
The BCM4325 supports page scan and inquiry scan modes that significantly reduce the average inquiry response and
connection times. These scanning modes are compatible with the Bluetooth version 2.1 page and inquiry procedures.
Broadcom Corporation
Document 4325-DS04-R
Adaptive Frequency Hopping
Page 17
CYPRESS [ CYPRESS ]
