Windowing is an effective approach to reduce out-of-band radiation (OBR) in multicarrier systems in order to avoid adjacent channel interference. However, commonly used window functions are chosen in an ad hoc manner and fixed. We present an optimal window design for windowed-OFDM minimizing OBR within a given frequency region. The proposed technique is flexible in that it allows to specify the range of frequencies involved in the minimization and to apply spectral weighting. The optimal window can be computed offline.

JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)
U1 - Accepted.

ER - TY - CONF T1 - Flexible spectral precoding for OFDM systems T2 - 2nd XoveTIC Conference Y1 - 2019 A1 - Khawar Hussain A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -Spectral precoding is a popular approach to reduce out-of-band radiation (OBR) in

multicarrier systems in order to avoid adjacent channel interference. However, it introduces

distortion in the data, appropriate decoding is required at the receiver side. Thus, trading off

between implementation complexity, OBR reduction and error rate is important. We present a novel

linear precoder design with flexibility to trade off OBR reduction, precoding/decoding complexity,

and error rate at the receiver. Moreover, the constraint can be imposed on each subcarrier individually

to provide more flexibility. The precoding matrices have low rank, which translates into significant

computational savings. In this way, the requirements of different systems can be satisfied with

varying complexity levels

JF - 2nd XoveTIC Conference
CY - A Coruña (Spain)
ER -
TY - CONF
T1 - Flexible spectral precoding for sidelobe suppression in OFDM systems
T2 - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP)
Y1 - 2019
A1 - Khawar Hussain
A1 - Ana Lojo
A1 - R. López-Valcarce
KW - spectrum shaping
KW - winter
AB - Spectral precoding is a popular approach to reduce out-of-band radiation (OBR) in multicarrier systems in order to avoid adjacent channel interference. Since precoding will introduce signal distortion, appropriate decoding is required at the receiver side. We present a novel linear precoder design with flexibility to trade off OBR reduction, precoding/decoding complexity, and error rate at the receiver. The precoding matrices have low rank, which translates into significant computational savings. In this way, the requirements of different systems can be satisfied with varying complexity levels.

JF - IEEE Int. Conf. Acoustics, Speech and Signal Processing (ICASSP) PB - IEEE CY - Brighton, UK ER - TY - CONF T1 - OFDM spectral precoding with per-subcarrier distortion constraints T2 - European Signal Processing Conference (EUSIPCO) Y1 - 2019 A1 - Khawar Hussain A1 - R. López-Valcarce KW - spectrum shaping KW - winter AB -Spectral precoding is effective in reducing out-of-band radiation

(OBR) in multicarrier systems, but it introduces distortion

in the data, requiring a suitable decoder at the receiver.

Thus, trading off OBR reduction, implementation complexity,

and error rate is of paramount importance. We present a precoder

design which minimizes OBR under constraints on the

distortion at each individual data subcarrier. By judiciously

choosing the distortion profile, the decoding task can be significantly

alleviated, with a sizable improvement in terms of

implementation complexity with respect to previous designs.

JF - European Signal Processing Conference (EUSIPCO)
CY - A Coruña, Spain
ER -