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Adaptive Modem from 4-QAM to 1024-QAM "Manero"
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.
The system can be enhanced with asynchronous Cross-Polar Intereference Canceler (XPIC) and/or diversity Combiner.
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.
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