Coexistence of OFDM-Based IMT-Advanced and FM Broadcasting Systems

Abstract

Coexistence analysis is extremely important in examining the possibility for spectrum sharing between orthogonal frequency‐division multiplexing (OFDM)‐based international mobile telecommunications (IMT)‐Advanced and other wireless services. In this letter, a new closed form method is derived based on power spectral density analysis in order to analyze the coexistence of OFDM‐based IMT‐Advanced systems and broadcasting frequency modulation (FM) systems. The proposed method evaluates more exact interference power of IMT‐Advanced systems in FM broadcasting systems than the advanced minimum coupling loss (A‐MCL) method. Numerical results show that the interference power is 1.3 dB and 3 dB less than that obtained using the A‐MCL method at cochannel and adjacent channel, respectively. This reduces the minimum separation distance between the two systems, which eventually saves spectrum resources.

Point-Point Fixed Wireless and Broadcasting Services Coexistence With Imt-Advanced System

“…ETSI spectrum emission masks in [10] are assumed to be used in this research. This ETSI SEM can be verified using the method published in [12], considering a rectangular signal for WiMAX and FWA systems, and, accordingly, Fig. 1 has been derived through extracting linear equations for each SEM with its certain channel bandwidth.…”

“…While β stands for the IPC which is assumed −6 dB. On the other hand, since no data available for the maximum permissible interference power at DVB-T receiver, in terms of I/N , the minimum detection signal (−116 dBm) has been adopted according to CEPT Rep. 24 [8,12]. This value is assumed because that if the interference power is lower than the minimum detection signal, then the receiver will not be affected by the interference.…”

“…Additionally, in TS to TS scenario, the high transmitted power and line of site possibility are there. Table 2 lists the coexistence factors for IMT-Advanced, FWA and DVB-T systems [3,8,10,12,[16][17][18]. For coexistence between WiMAX and FWA, interfering and victim antennas are assumed to be on opposite towers and directly pointing at each other is (worst case).…”

An Improved Mathematical Scheme for LTE-Advanced Coexistence with FM Broadcasting Service

“…However, A-MCL is not suitable for studying the interference from OFDM-based systems into Frequency Modulation (FM) broadcasting service that has a triangular power spectral density (PSD) shape [9, 10, 20, 21]. Therefore, the approximate-interference signal power attenuation (ISPA) method is derived by [9, 10] to evaluate interference from IMT-Advanced systems to FM broadcasting.…”

“…We propose this method due to that the approximate-interference signal power attenuation (ISPA) method [9, 10] uses approximation calculations of LTE-Advanced interference power into FM service which causes overestimation of the interference. In contrast, this proposed method is more accurate than the existing schemes [9–12] as it takes into account realistic shapes of the interferer and victim signals. This removes a source of overestimation of the interference and allows reducing the separation distance between the two systems, which eventually supports efficient use of the radio frequency spectrum.…”