Abstract:
Continuous phase modulation (CPM) is widely employed in digital communication systems due to its high spectral efficiency. The main digital implementations originate in t...Show MoreMetadata
Abstract:
Continuous phase modulation (CPM) is widely employed in digital communication systems due to its high spectral efficiency. The main digital implementations originate in the well-known ROM-based approach. In this approach, the memory size may be very large and depends completely on the modulation parameters. This means that supporting several modulation types would require a proportional increase on the memory resources. In this paper, a new versatile single h and multi-h CPM transmitter is introduced, which can be reconfigured for handling any kind of CPM waveform without noticeable increase in memory. A complete digital architecture is also provided. This represents a truly reconfigurable CPM transmitter, which can be used for software defined radio platforms. Implementation results show that in data rates of more than 20 Mbps as required by the IRIG-106-15 standard, the proposed approach yields a savings of around 1.5 megabits of memory when compared to the ROM approach, at the expense of requiring 15 multipliers. Additionally, for medium-rate implementations as required in the Bluetooth standard, the proposed transmitter offers a savings of about 50 Kbits of memory while requiring only two multipliers. Simulation results confirm that the signals produced by this new approach match those expected from theoretical analysis.
Published in: IEEE Transactions on Circuits and Systems I: Regular Papers ( Volume: 63, Issue: 5, May 2016)