Ieee 802.11 ™ B/G/N Phy - Infineon Cypress WICED CYW43903 Manual

™
7.3 IEEE 802.11 b/g/n PHY
The CYW43903 WLAN digital PHY complies with IEEE 802.11b/g/n single-stream specifications to provide wireless LAN connectivity
supporting data rates from 1 Mbps to 72 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 filters, FFTs, and Viterbi-decoder algorithms. Efficient algorithms have been designed to achieve
maximum throughput and reliability, including algorithms for carrier sensing and rejection, frequency/phase/timing acquisition and
tracking, and channel estimation and tracking. The PHY receiver also contains a robust IEEE 802.11b demodulator. The PHY carrier-
sensing algorithm provides high throughput for IEEE 802.11b/g hybrid networks with Bluetooth coexistence.
The key PHY features include:
Programmable data rates from MCS0–7 in 20 MHz channels.
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Support for Optional Short GI and Green Field modes in TX and RX.
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TX and RX LDPC for improved range and power efficiency.
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All scrambling, encoding, forward error correction, and modulation in the transmit direction and inverse operations in the receive
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direction.
Support for IEEE 802.11h/k for worldwide operation.
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Advanced algorithms for low power consumption and enhanced sensitivity, range, and reliability.
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Algorithms to improve performance in the presence of externally received Bluetooth signals.
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An automatic gain control scheme for blocking and nonblocking cellular applications.
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Closed loop transmit power control.
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Digital RF chip calibration algorithms to handle CMOS RF chip process, voltage, and temperature (PVT) variations.
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On-the-fly channel frequency and transmit power selection.
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Per-packet RX antenna diversity.
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Available per-packet channel quality and signal-strength measurements.
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Compliance with FCC and other worldwide regulatory requirements.
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Filters
and
Radio
Comp
Radio
Control
Block
AFE
and
Radio
Common
Logic
Block
Filters
and
Radio
Comp
Document Number: 002-14826 Rev. *G
PRELIMINARY
Figure 9. WLAN PHY Block Diagram
Frequency
and Timing
Synch
Carrier Sense,
AGC, and Rx
FSM
Buffers
Tx FSM
PA Comp
CCK/DSSS
Demodulate
OFDM
Viterbi Decoder
Demodulate
FFT/IFFT
Modulation
and Coding
Modulate/
Spread
CYW43903
Descramble
and Deframe
MAC
Interface
Frame and
Scramble
COEX
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