Optimum Nyquist windowing in OFDM receivers
نویسنده
چکیده
Conventional orthogonal frequency-division multiplexing receivers disregard the guard interval in channels with small dispersion even though its unconsumed portion can be exploited for improved demodulation by applying a Nyquist-shaped window in the receiver. The transmitter does not need to be modified, subcarrier orthogonality in the receiver is preserved, and the receiver discrete Fourier transform size can be retained. Windowing can mitigate the joint effect of additive noise and intercarrier interference among subcarriers caused by the carrier frequency offset. In this letter, a closed solution for optimum window coefficients suited to this scenario is derived.
منابع مشابه
Optimum Nyquist windowing for improved OFDM receivers
Conventional Orthogonal Frequency–Division Multiplexing (OFDM) receivers disregard oversized guard intervals. An (adaptive) Nyquist–shaped receive window could exploit signal samples in its unconsumed portion to improve demodulation. The OFDM transmitter is not modified, subcarrier orthogonality is preserved, and the DFT size may be retained. In this paper, we optimize the window shape by consi...
متن کاملPerformance Improvement in OFDM System Using Modified Sinc Pulse as Receiver Window
The Orthogonal Frequency Division Multiplexing (OFDM) system have some problems such as carrier frequency offset, timing offset, and Peak to Average Power Ratio (PAPR). The impacts of these problems results into inter carrier interference (ICI) which affects the bit error rate (BER). Therefore, suitable methods are required to mitigate ICI at the receiver. In this paper a new pulse shape, by mo...
متن کاملTiming, carrier frequency and phase recovery for OFDM and Nyquist signals using a mean modulus algorithm.
Efficient algorithms for timing, carrier frequency and phase recovery of Nyquist and OFDM signals are introduced and experimentally verified. The algorithms exploit the statistical properties of the received signals to efficiently derive the optimum sampling time, the carrier frequency offset, and the carrier phase. Among the proposed methods, the mean modulus algorithm (MMA) shows a very robus...
متن کاملInterference Suppression in DMT Receivers Using Windowing
A new receiver structure for improving the performance of conventional Discrete Multitone (DMT) based Digital Subscriber Line (DSL) transceivers is described. In this method, the conventional demodulator consisting of a FFT followed by a scalar frequency-domain equalizer is augmented by an additional data-path utilizing windowing. Time-limited receiver windowing is done independently for each s...
متن کاملMMSE techniques for space diversity receivers in OFDM-based wireless LANs
This paper studies the application of the Minimum Mean Square Error beamformer to OFDM-based Wireless LANs. The questions here addressed are mainly the design with finite-length data and the choice of the OFDM signal domain where the beamformer is applied, either frequency or time. As OFDM signals need more samples than other modulations to stabilize the estimations of the signal statistics, ho...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- IEEE Trans. Communications
دوره 49 شماره
صفحات -
تاریخ انتشار 2001