ADVANCE
CYW43570
10.2 IEEE 802.11ac Draft PHY
The CYW43570 WLAN Digital PHY is designed to comply with IEEE 802.11ac Draft and IEEE 802.11a/b/g/n dual-stream specifica-
tions to provide wireless LAN connectivity supporting data rates from 1 Mbps to 866.7 Mbps for low-power, high-performance handheld
applications.
The PHY has been designed to work in the presence of interference, radio nonlinearity, and various other impairments. It incorporates
optimized implementations of the filters, FFT and Viterbi decoder algorithms. Efficient algorithms have been designed to achieve
maximum throughput and reliability, including algorithms for carrier sense/rejection, frequency/phase/timing acquisition and tracking,
channel estimation and tracking. The PHY receiver also contains a robust IEEE 802.11b demodulator. The PHY carrier sense has
been tuned to provide high throughput for IEEE 802.11g/11b hybrid networks with Bluetooth coexistence.
The key PHY features include:
■ Programmable data rates from MCS0–15 in 20 MHz, 40 MHz, and 80 MHz channels, as specified in IEEE 802.11ac Draft
■ Supports Optional Short GI and Green Field modes in Tx and Rx
■ Tx and Rx LDPC for improved range and power efficiency
■ Beamforming support
■ All scrambling, encoding, forward error correction, and modulation in the transmit direction and inverse operations in the receive
direction.
■ Supports IEEE 802.11h/k for worldwide operation
■ Advanced algorithms for low power, enhanced sensitivity, range, and reliability
■ Algorithms to improve performance in presence of Bluetooth
■ Closed loop transmit power control
■ Digital RF chip calibration algorithms to handle CMOS RF chip non-idealities
■ On-the-fly channel frequency and transmit power selection
■ Supports per packet Rx antenna diversity
■ Available per-packet channel quality and signal strength measurements
■ Designed to meet FCC and other worldwide regulatory requirements
Figure 21. WLAN PHY Block Diagram
CCK/DSSS Demodulate
Filters and Radio
Comp
Frequency and
Timing Synch
Descramble and
Deframe
OFDM Demodulate
Viterbi Decoder
Carrier Sense, AGC, and
Rx FSM
Buffers
MAC
Radio Control Block
FFT/IFFT
Interface
AFE and
Radio
Tx FSM
Modulation and
Coding
Common Logic Block
Frame and
Scramble
Filters and Radio Comp
PA Comp
Modulate/Spread
COEX
Document Number: 002-15054 Rev. *I
Page 44 of 94
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