PRELIMINARY
CYW43438
Figure 21. CVSD Decoder Output Waveform After Applying PLC
8.4.7 Codec Encoding
The CYW43438 can support SBC and mSBC encoding and decoding for wideband speech.
8.4.8 Multiple Simultaneous A2DP Audio Streams
The CYW43438 has the ability to take a single audio stream and output it to multiple Bluetooth devices simultaneously. This allows a
user to share his or her music (or any audio stream) with a friend.
8.4.9 FM Over Bluetooth
FM Over Bluetooth enables the CYW43438 to stream data from FM over Bluetooth without requiring the host to be awake. This can
significantly extend battery life for usage cases where someone is listening to FM radio on a Bluetooth headset.
8.5 Adaptive Frequency Hopping
The CYW43438 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.
8.6 Advanced Bluetooth/WLAN Coexistence
The CYW43438 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 appli-
cations 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 WLAN. Dual-antenna applications are also
supported. The CYW43438 radio architecture allows for lossless simultaneous Bluetooth and WLAN reception for shared antenna
applications. This is possible only via an integrated solution (shared LNAand joint AGC algorithm). It has superior performance versus
implementations that need to arbitrate between Bluetooth and WLAN reception.
The CYW43438 integrated solution enables MAC-layer signaling (firmware) and a greater degree of sharing via an enhanced coexis-
tence interface. Information is exchanged between the Bluetooth and WLAN cores without host processor involvement.
The CYW43438 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).
The Bluetooth AFH classification is also enhanced by the WLAN core’s channel information.
8.7 Fast Connection (Interlaced Page and Inquiry Scans)
The CYW43438 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.
Document Number: 002-14796 Rev. *K
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