Bounds on Residual Inter-carrier Interference in OFDM Systems with Subcarrier Equalization
نویسندگان
چکیده
In this paper, closed-form and polynomial bounds are derived for the residual intercarrier interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems resulting from Doppler spread or carrier frequency offset (CFO). We consider the idea of equalizing neighboring subcarriers and the residual interference comes from the subcarriers outside of the equalization window. The longer the equalization window is, the lower residual interference can be. The bounds become functions of maximum Doppler frequency, symbol duration, and the length of equalization window.
منابع مشابه
A Max-Min Approach to Channel Shortening in OFDM Systems
In OFDM systems, residual inter-block interference can be suppressed by a time-domain equalizer that blindly shortens the effective length of a channel impulse response. To further improve the performance of blind equalizers, we propose a channel shortening method that attempts to maximize the minimum FFT output power over data subcarriers. Simulation results indicate that the max-min strategy ...
متن کاملInter Carrier Interference mitigation in OFDM system using Kalman Filter Channel Estimation
Orthogonal frequency division multiplexing (OFDM) is one of the modulation scheme, used for high speed mobile communication. However, fast time varying multipath channels leads to loss of orthogonality of subcarriers and introduces inter carrier interference (ICI). In this study, MMSE equalizer is implemented to remove ICI. The information of Channel Impulse Response (CIR) required for equalize...
متن کاملChannel modeling and associated inter-carrier interference equalization for OFDM systems with high Doppler spread
In this paper, we address the problem of OFDM transmission over a time-varying, frequency-selective channel with high Doppler spread. This creates situations where the channel significantly evolves over the time span of one OFDM symbol. We analyze the CP-OFDM transmission mechanism, and the impairments due to the channel variations, using a decomposition of these variations over a base of sinus...
متن کاملMultiple CFOs in OFDM-SDMA Uplink: Interference Analysis and Compensation
In OFDM-based space division multiple access (SDMA) systems, multiple users are served by a multiantenna base station simultaneously on the same frequency resources. In the uplink, each user’s signal may be distorted by an independent carrier frequency offset (CFO), which impairs the orthogonality of the subcarrier signals and, if not properly compensated, results in performance degradations. W...
متن کاملIterative Decision Feedback Equalization for Filter Bank Multicarrier Systems
Filter Bank Multicarrier (FBMC) systems are a class of multicarrier modulation schemes for high speed wireless communication. These systems are known for their low adjacent channel leakage. In this paper we focus on the problem of channel equalization for FBMC systems. Most solutions in the literature use a per subcarrier equalization suffering from an error floor at high signal-to-noise ratios...
متن کامل