Abstract
| Original language | Unknown |
|---|---|
| Title of host publication | Telecommunications and Multimedia (TEMU), International Conference on |
| Pages | 127 - 131 |
| DOIs | |
| Publication status | Published - 1 Jan 2014 |
| Event | International Conference on Telecommunications and Multimedia (TEMU), 2014 - Duration: 1 Jan 2014 → … |
Conference
| Conference | International Conference on Telecommunications and Multimedia (TEMU), 2014 |
|---|---|
| Period | 1/01/14 → … |
Keywords
Cite this
}
Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals. / Montezuma de Carvalho, Paulo Miguel de Araújo Borges; Dinis, Rui Miguel Henriques Dias Morgado; DEE Group Author.
Telecommunications and Multimedia (TEMU), International Conference on. 2014. p. 127 - 131.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Low Complexity Multiple User Detection for SC-FDE with OQPSK Signals
AU - Montezuma de Carvalho, Paulo Miguel de Araújo Borges
AU - Dinis, Rui Miguel Henriques Dias Morgado
AU - DEE Group Author
PY - 2014/1/1
Y1 - 2014/1/1
N2 - It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.
AB - It is widely accepted that SC-FDE (Single Carrier with Frequency Domain Equalization) schemes are preferable for the uplink of broadband wireless systems since these signals have lower PAPR (Peak to Average Power Ratio) than OFDM (Orthogonal Frequency Division Multiplexing) signals. However, when we want to employ power-efficient grossly nonlinear amplifiers, as in satellite communications, the SC signals must have quasi-constant envelopes which have a spectral occupation much higher than the minimum Nyquist band, resulting in low spectral efficiency. In this paper we consider a low complexity pragmatic FDMA (Frequency Division Multiple Access) system employing OQPSK (Offset Quaternary Phase Shift Keying) modulations with quasi-constant envelope that increases the overall spectral efficiency by considering total spectral overlapping of two different users. To mitigate the overall interference, we present an iterative frequency-domain receiver with parallel multiple user detection capable to cope with ISI (Inter-Symbol Interference), CCI (Co-Channel Interference) levels inherent to the spectral overlapping, and IQI (In-phase/Quadrature Interference), the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, for severely time-dispersive channels.
KW - Iterative receivers
KW - Offset modulations
KW - MUD
KW - SC-FDE
KW - CCI
KW - IQI
U2 - 10.1109/TEMU.2014.6917748
DO - 10.1109/TEMU.2014.6917748
M3 - Conference contribution
SP - 127
EP - 131
BT - Telecommunications and Multimedia (TEMU), International Conference on
ER -