Design and Implementation of Iterative Decoder for Faster-than-Nyquist Signaling Multicarrier systems

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Abstract in Undetermined
Faster-than-Nyquist (FTN) signaling is a method of improving bandwidth efficiency by transmitting information beyond Nyquist's orthogonality limit for interference free transmission. Previously have theoretically established that FTN can provide improved bandwidth efficiency. However, this comes at the cost of higher decoding complexity at the receiver. Our work has evaluated multicarrier FTN signaling for its implementation feasibility and complexity overhead compared to the gains in bandwidth efficiency. The work carried out in this research project includes a systems perspective evaluating performance, algorithm hardware tradeoffs and a hardware architecture leading to a silicon implementation of the decoder for FTN signaling. From the systems perspective, co-existence of FTN and OFDM based multicarrier system has been evaluated. OFDM being a part of many existing and upcoming broadband access technologies such as WLAN, LTE, DVB, this analogy is motivated. On the hardware aspect, the proposed architecture can accommodate both OFDM and FTN systems. The processing blocks in transmitter and receiver were designed for reuse and carry out different functions in the transceiver. Furthemore, the hardware could be configured to operate at varying bandwidth efficiencies (by FTN signaling) to exploit the channel conditions. The decoder implementation also considered block sizes and data rates to comply with the 3GPP standard. The decoding is carried out in as few as 8 iterations making it more practical for implementation in power constrained mobile devices. The decoder is implemented in 65nm CMOS process and occupies a total chip area of 0.8mm2.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • 3G mobile communication, CMOS integrated circuits, OFDM modulation, iterative decoding
Original languageEnglish
Title of host publication[Host publication title missing]
PublisherIEEE--Institute of Electrical and Electronics Engineers Inc.
Publication statusPublished - 2011
Publication categoryResearch
EventIEEE Computer Society Annual Symposium on VLSI (ISVLSI) - Chennai, India
Duration: 2011 Jul 42011 Jul 6

Publication series

ISSN (Print)2159-3477


ConferenceIEEE Computer Society Annual Symposium on VLSI (ISVLSI)