The Broadcom BCM3137 QAMLink® Universal QPSK/16 QAM Burst Receiver is a complete single-chip cable network receiver, that accepts QPSK and 16 QAM upstream burst data in a frequency-agile, time-division multiple access (TDMA) scheme. An Analog front-end (AFE), a QAM Demodulator and an FEC decoder are integrated on this single chip. The AFE performs coarse gain setting and A-to-D conversion on either an IF input or baseband I/Q inputs. Adigital down-mixer translates the input spectral center to true DC. The I and Q samples pass through dual decimators and square- root raised cosine Filters with an excess bandwidth α = 0.25. Fast burst detection and acquisition are performed on the preamble with programmable length and pattern. The chip incorporates unique word (UW) detection in the preamble process to delineate the packet and resolve phase ambiguity. Carrier phase offset is removed by a derotator. An adaptive equalizer characterizes the RF channel response and removes inter-symbol interference (ISI) caused by micro-reflections. The FEC decoder consists of a programmable derandomizer and a programmable RS decoder. FIFO Buffers provide input/output data rate de-coupling for the FEC decoder. By Broadcom Corp.
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