BCM88335 Data Sheet
IEEE 802.11ac PHY
IEEE 802.11ac PHY
The BCM88335 WLAN Digital PHY is designed to comply with IEEE 802.11ac and IEEE 802.11a/b/g/n single-
stream specifications to provide wireless LAN connectivity supporting data rates from 1 Mbps to 433.3 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. It has also been
designed for shared single antenna systems between WL and BT to support simultaneous RX-RX.
The key PHY features include:
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Programmable data rates from MCS0–9 in 20 MHz, 40 MHz, and 80 MHz channels, as specified in
IEEE 802.11ac
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Supports Optional Short GI mode in TX and RX
TX and RX LDPC for improved range and power efficiency
Supports optional space-time block code (STBC) receive of two space-time streams for improved
throughput and range in fading channel environments.
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All scrambling, encoding, forward error correction, and modulation in the transmit direction and inverse
operations in the receive direction.
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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
Automatic gain control scheme for blocking and non blocking application scenario for cellular applications
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
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 70
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