IP Catalog > Other > Adaptive Modem from 4-QAM to 1024-QAM "Manero"

Adaptive Modem from 4-QAM to 1024-QAM "Manero"

Overview

The Binary Core coded modulation scheme bc005 ("Manero") is extremely compact, highly modular, and it supports all square and cross modulation formats from 4- up to 1024-QAM. The modem is well suited for implementation on microwave point-to-point digital radio links and it is compliant with the ETSI EN 302 217-2-2 standard requirements. Typical channel spacings are 3.5-7-14-28-56 MHz (if implemented on low cost FPGAs) and up to 112 MHz (if implemented on high performance FPGAs).

The system can be enhanced with asynchronous Cross-Polar Intereference Canceler (XPIC) and/or diversity Combiner.

Key Features

  • Eight modulation formats (4-, 16-, 32-, 64-, 128-, 256-, 512-, and 1024-QAM).
  • Adaptive modulation switching based on channel measurement and internal service channel signaling.
  • Byte interface compatible with both asynchronous and synchronous data flow.
  • Finely tuneable symbol frequency.
  • Only one external clock source required, feeding FPGA, DAC, and ADC.
  • Polynomial predistortion.
  • TX and RX I/Q impairments recovery (amplitude and phase unbalance).
  • Timing recovery with digital re-sampling.
  • Carrier recovery with pilot symbols for improved robustness to phase noise.
  • Automatic frequency recovery for fast carrier acquisition.
  • 20-tap adaptive fractionally spaced equalizer.
  • Efficient coding scheme based on punctured convolutional code with mapping by set partitioning, and concatenated Reed-Solomon code.
  • Very high reconfigurability (convolutional code rate, Reed-Solomon code rate, interleaver depth, pilot symbol rate).
  • User definable service channel for closed-loop communication between transceivers.
  • [optional] Asynchronous XPIC and Combiner.

Technical Specifications

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