TY - GEN
T1 - Precoded-OFDM within GFDM framework
AU - Nimr, Ahmad
AU - Chafii, Marwa
AU - Fettweis, Gerhard
N1 - Funding Information:
This work has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreements No 777137 (5GRANGE project) and No 732174 (ORCA Project [https://www.orca-project.eu/]).
Publisher Copyright:
© 2019 IEEE.
PY - 2019/4
Y1 - 2019/4
N2 - To meet the requirements of new 5G use cases, two methodologies have been proposed. The first considers additional processing on orthogonal frequency division multiplexing (OFDM), e.g. windowing, filtering, and precoding. The other aims at the design of new modulation schemes. Essentially, any block-based linear modulation, such as generalized frequency division multiplexing (GFDM), can be seen as precoded-OFDM, where the precoded data result from the frequency domain modulation. This representation has a significant benefit for the implementation of new waveforms. Namely, the available OFDM transceiver techniques can be reused, whereas the required signal features can be fulfilled by the configuration of the GFDM modem. In this paper, we propose flexible OFDM precoding based on the GFDM framework. As a particular case, we focus on orthogonal precoding to enhance the performance in fading channels. By means of closed-form expressions, we show that all the sybsymbols within the same GFDM subcarrier attain the same signal-to-interference-plus-noise ratio (SINR) in frequency selective channel. In special precoding cases, all symbols achieve equal SINR. This feature is important to enhance the performance without a need for power allocation.
AB - To meet the requirements of new 5G use cases, two methodologies have been proposed. The first considers additional processing on orthogonal frequency division multiplexing (OFDM), e.g. windowing, filtering, and precoding. The other aims at the design of new modulation schemes. Essentially, any block-based linear modulation, such as generalized frequency division multiplexing (GFDM), can be seen as precoded-OFDM, where the precoded data result from the frequency domain modulation. This representation has a significant benefit for the implementation of new waveforms. Namely, the available OFDM transceiver techniques can be reused, whereas the required signal features can be fulfilled by the configuration of the GFDM modem. In this paper, we propose flexible OFDM precoding based on the GFDM framework. As a particular case, we focus on orthogonal precoding to enhance the performance in fading channels. By means of closed-form expressions, we show that all the sybsymbols within the same GFDM subcarrier attain the same signal-to-interference-plus-noise ratio (SINR) in frequency selective channel. In special precoding cases, all symbols achieve equal SINR. This feature is important to enhance the performance without a need for power allocation.
KW - GFDM
KW - LMMSE
KW - OTFS
KW - Precoded-OFDM
UR - http://www.scopus.com/inward/record.url?scp=85068993033&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068993033&partnerID=8YFLogxK
U2 - 10.1109/VTCSpring.2019.8746539
DO - 10.1109/VTCSpring.2019.8746539
M3 - Conference contribution
AN - SCOPUS:85068993033
T3 - IEEE Vehicular Technology Conference
BT - 2019 IEEE 89th Vehicular Technology Conference, VTC Spring 2019 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 89th IEEE Vehicular Technology Conference, VTC Spring 2019
Y2 - 28 April 2019 through 1 May 2019
ER -