Multi Carrier Modulation and Single Carrier Modulation
- 1. MultiCarrier vs Single Carrier Fernando Ramirez-Mireles, Ph.D. ramirezm@ieee.org, framirez@itam.mx Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 1 framirez@itam.mx
- 2. MultiCarrier (Discrete Multi Tone DMT) and Single Carrier Modulation (SCM) Mr. FEC DISCRETE MULTI TONE (Divide and Conquer) SINGLE CARRIER MODULATION Signal PSD (dBm/Hz) Signal PSD (dBm/Hz) US1 DS1 US2 DS2 US3 US1 DS1 US2 DS2 US3 Frequenc Frequenc freq. freq. freq. freq. freq. freq. freq. freq. freq. freq. y y 1 2 3 4 5 1 2 3 4 5 (MHZ) (MHZ) Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 2 framirez@itam.mx
- 3. Multicarrier (DMT) Processing Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 3 framirez@itam.mx
- 4. SCM Processing Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 4 framirez@itam.mx
- 5. Comparing Multicarrier (DMT) and SCM Issues Deleterious DMT solution SCM solution Advantages of effects DMT over SCM Channel Signal Equalization: Two simple Equalization: Simplicity in Time Smearing equalizers, one in time One complicated design and Dispersion domain and one in equalizer in time implementation frequency domain domain Frequency Frequency Bit loading: Transmit No bit loading: Bandwidth dependent dependent more bits in frequency Transmit the efficiency and Noise signal-to- bands where there is less same average higher throughput noise ratio noise and less bits in number of bits in (SNR) frequency bands where every frequency there is more noise band regardless of amount of noise in each frequency band FDD full Interference Signal separation: Use no Signal Higher spectrum duplex between filtering, utilize Fourier separation: Use utilization, higher operation in upstream Transform orthogonality one complicated throughput and multi-band and properties filter per flexible spectrum downstream transmission implementation of plans signals band different band plans Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 5 framirez@itam.mx
- 6. FERNANDO RAMIREZ-MIRELES ramirezm@ieee.org Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 6 framirez@itam.mx
- 7. About the author Fernando has over 10 years of experience in R&D in VDSL, UWB and speech processing. He has worked in the DSL field as a systems and algorithms engineer. He is currently a professor in the engineering division at ITAM in Mexico City. He has authored more than twenty technical articles and has one patent granted and two more pending. He is a senior member of the IEEE. He can be reached at ramirezm@ieee.org. Multi Carrier vs. Single Carrier Copyright 2012 Fernando Ramirez-Mireles ramirezm@ieee.org, 7 framirez@itam.mx