Combined minimization of intersymbol interference (ISI) and adjacent channel interference (ACI)
AssigneeUniversity of South Florida
InventorsBerker Pekoz, Selcuk Kose, Huseyin Arslan
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Abstract
Adaptive windowing of insufficient cyclic prefix (CP) for joint minimization of intersymbol interference (ISI) and adjacent channel interference (ACI) is provided. The proposed subcarrier specific windowing scheme improves the signal-to-interference ratio (SIR) even when the cyclic prefix (CP) is insufficient. Average optimal window lengths depend only on the power density profiles (PDPs), and although instantaneous optimal window lengths depend on users' channel impulse responses (CIRs), fluctuation is little. Therefore, subcarrier specific windowing outperforms fixed windowing, even with outdated window lengths in the case of powerful interferers.
Claims10
One or more non-transitory computer-readable media having computer-executable instructions for performing a method of running a software program on a computing device, the computing device operating under an operating system, the method including issuing instructions from the software program for windowing of an Orthogonal Frequency Division Multiplexing (OFDM)-based signal, the instructions comprising:
- receiving, at a receiver, an OFDM-based signal comprising a plurality of subcarriers;
- estimating an aggregate adjacent channel interference (ACI) and intersymbol interference (ISI) at each of the plurality of subcarriers;
- estimating an optimal window duration for each of the plurality of subcarriers, wherein the optimal window duration is a duration that minimizes the aggregate adjacent channel interference (ACI) and intersymbol interference (ISI) at each of the plurality of subcarriers;
- and
- performing, at the receiver, windowing of each of the plurality of subcarriers of the received OFDM-based signal by multiplying each of the plurality of subcarriers by the optimal window duration to generate a filtered OFDM-based signal.
One or more non-transitory computer-readable media having computer-executable instructions for performing a method of running a software program on a computing device, the computing device operating under an operating system, the method including issuing instructions from the software program for windowing of an Orthogonal Frequency Division Multiplexing (OFDM)-based signal, the instructions comprising:
- receiving, at a transmitter, an OFDM-based signal comprising a plurality of subcarriers;
- estimating an aggregate adjacent channel interference (ACI) and intersymbol interference (ISI) at each of the plurality of subcarriers;
- estimating an optimal window duration for each of the plurality of subcarriers, wherein the optimal window duration is a duration that minimizes the aggregate adjacent channel interference (ACI) and intersymbol interference (ISI) at each of the plurality of subcarriers;
- performing, at the transmitter, windowing of each of the plurality of subcarriers of the received OFDM-based signal by multiplying each of the plurality of subcarriers by the optimal window duration to generate a filtered OFDM-based signal;
- and
- transmitting, from the transmitter, the filtered OFDM-based signal.
Dependencies are inferred from the claim text.