A novel ICI self‐cancellation scheme for OFDM systems

Abstract

SUMMARYWe propose a novel intercarrier interference (ICI) self-cancellation scheme for orthogonal frequency division multiplexing (OFDM) systems. The symmetric scheme is the best among all ICI self-cancellation scheme in the literature. Its coefficient pair is (1, −1), and the loading subcarriers are the k th and N −k −1 th subcarriers, where N is the number of subcarriers. We propose to modify the symmetric scheme and change the coefficient pair from (1, −1) to (1, − ) where is between 0 and 1. The proposed modified symmetric scheme has better carrier-to-interference-ratio (CIR) than all previous ICI self-cancellation schemes by at least 1.7 dB when the normalized frequency offset is 0.5.

Optimal resource allocation for energy efficiency in coordinated multicell OFDMA networks

“…It is interesting to notice that the fix power consumption of BS (i.e., P c ) is not involved in the optimal solution, it only affects the value of the EE. (5) 3: Calculate Q n m according to (8) and Q, Q as (6) 4: repeat 5: Obtain Q p by solving (7) 6: Update Q s according to (5) …”

“…16 WiMAX and 3GPP LTE-A and also in next cellular systems such as 802.22 wireless regional area network [5,6] because of its high-spectral efficiency, low-complexity modulation, and resistance to inter-symbol interference [7,8]. In OFDMA, the entire bandwidth of the system is divided into narrow-band, orthogonal subcarriers, by this way, OFDMA systems can take advantage of frequency diversity and multiuser diversity [9], where users at different location can experience different level of fading across Because the objective function in the optimization problem is in nonlinear fractional form, exploiting the property of nonlinear fractional programming [14], we transfer it into normal subtractive form and easier to manipulate; moreover, using Dinklebach algorithm [14], the optimal solution of the original problem can be obtained by iteratively solving the corresponding transferred problem with convergence guaranteed (Section 3.3).…”

“…Orthogonal frequency-division multiplexing access (OFDMA) is the preferred access technique for the fourth-generation wireless cellular systems such as IEEE 802. 16 WiMAX and 3GPP LTE-A and also in next cellular systems such as 802.22 wireless regional area network [5,6] because of its high-spectral efficiency, low-complexity modulation, and resistance to inter-symbol interference [7,8]. In OFDMA, the entire bandwidth of the system is divided into narrow-band, orthogonal subcarriers, by this way, OFDMA systems can take advantage of frequency diversity and multiuser diversity [9], where users at different location can experience different level of fading across OPTIMAL RESOURCE ALLOCATION FOR EE IN MULTICELL OFDMA NETWORKS 2021 subcarriers; therefore, an appropriate coordinated user scheduling and transmit power adaptation for each subcarrier can achieve the maximum capacity of the systems [10,11].…”

QoE and energy efficiency aware resource allocation for OFDM systems in group mobility environments

“…The ICI canceling strategies have been considered in many literature . The ICI effect can be effectively mitigated by the conventional ICI self‐cancelation schemes in at the cost of having the spectral efficiency.…”

“…The ICI canceling strategies have been considered in many literature [3][4][5][6][7][8]. The ICI effect can be effectively mitigated by the conventional ICI self-cancelation schemes in [3,4] at the cost of QOE AND EE RESOURCE ALLOCATION FOR OFDM SYSTEMS 3527 having the spectral efficiency. Other ICI mitigation approaches include time-domain windowing [5], frequency-domain equalization [6], and the two-path algorithm referred as conjugate cancelation [7].…”