BCM4354 datasheet(80/192 Pages) CYPRESS

80 / 192 page

IEEE 802.11ac Draft PHY

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 79

IEEE 802.11ac Draft PHY

The BCM4354 WLAN Digital PHY (see Figure 31 on page 80) is designed to comply with IEEE 802.11ac Draft

and IEEE 802.11a/b/g/n dual-stream specifications 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. It has also been

designed for sharing an antenna between WL and BT to support simultaneous RX-RX.

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

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