PRELIMINARY
CYW43438
5.2.1 PHY Features
■ Supports the IEEE 802.11b/g/n single-stream standards.
■ Explicit IEEE 802.11n transmit beamforming.
■ Supports optional Greenfield mode in TX and RX.
■ Tx and Rx LDPC for improved range and power efficiency.
■ Supports IEEE 802.11h/d for worldwide operation.
■ Algorithms achieving low power, enhanced sensitivity, range, and reliability.
■ Algorithms to maximize throughput performance in the presence of Bluetooth signals.
■ Automatic gain control scheme for blocking and nonblocking application scenarios for cellular applications.
■ Closed-loop transmit power control.
■ Designed to meet FCC and other regulatory requirements.
■ Support for 2.4 GHz Broadcom TurboQAM data rates and 20 MHz channel bandwidth.
Figure 17. 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
Radio
Control
Block
MAC
Interface
FFT/IFFT
AFE
and
Radio
Modulation
and Coding
Tx FSM
Frame and
Scramble
Filters and
Radio Comp
Modulate/
Spread
PA Comp
COEX
The PHY is capable of fully calibrating the RF front-end to extract the highest performance. On power-up, the PHY performs a full
calibration suite to correct for IQ mismatch and local oscillator leakage. The PHY also performs periodic calibration to compensate
for any temperature related drift, thus maintaining high-performance over time. A closed-loop transmit control algorithm maintains the
output power at its required level and can control TX power on a per-packet basis.
Document Number: 002-14796 Rev. *K
Page 28 of 101
CYPRESS [ CYPRESS ]
