ISI-free pulse shaping filters for receivers with or without a matched filter

We present a design procedure to obtain pulse shaping filters which result intersymbol interference (ISI) free transmit signals as well as matched filtered received signals. Such kind of pulse shaping filters presents flexibility in the design of the receiver systems. The design procedure results symmetric filters as opposed to the filters proposed in previous works. Design parameters can be used to trade the stopband attenuation or fast decay in time for doubly ISI-free property. The performance of the filters is tested in a V26ter modem in comparison with the standard raised-cosine filters. Both filters have almost identical performances in terms of MSE at the equalizer input.


ISI channel equalizers based on the factor graphs for M-QAM signalling M-QAM kipleme icin garpan gizge temelli ISI kanal denklestiriciler
Sen, Pmar; Gelincik, Samet; Aktas, Tugcan; Yılmaz, Ali Özgür (2013-08-05)
In this work, we consider two methods especially for high order modulation types, namely the sum-product (SP) and linear minimum mean square error (LMMSE) algorithms, which were previously utilized to equalize the inter-symbol interference (ISI) channel. Techniques for reducing the computational complexity are proposed for the SP-based method. In addition, a new technique for the calculation of the extrinsic information is proposed, which significantly improves the performance in the LMMSE equalizer. The co...
Temporal and spatial forecasting of the foF2 values up to twenty four hours in advance
Tulunay, E; Ozkaptan, C; Tulunay, Yurdanur (2000-01-01)
Radio waves of a wide range of frequencies from very low frequency (VLF) to high frequency (HF), (broadly 3 to 30 MHz) can be propagated to great distances via the ionosphere.
MMSE based iterative turbo equalization for antenna switching system Anten anahtarlamali sistemler için MMSE tabanli yinelemeli turbo denkleştirici
Yildirim, Recep Ali; Yılmaz, Ali Özgür (2010-12-01)
In this paper, we study the performance of an antenna switching (AS) system in a multipath Rayleigh fading channel in comparison to an Alamouti coded system. We propose a minimum mean-squared error based iterative equalizer for the multi-antenna system. In the proposed receiver, MMSE equalization and channel decoding are jointly carried out at each iteration by using the a priori probabilities from previous iterations. It is observed that Alamouti based scheme performs better when the channel state informat...
Design of Selective Linear Phase Cross-Coupled Dielectric Resonator Filters
Ozturk, Onur Ozan; Oruc, Sacid; Alicioglu, Bulent; Yıldırım, Nevzat (2018-11-02)
In this paper, a highly selective linear phase filter is designed and implemented in cross-coupled form using dielectric resonators in Ku band to be used as a channel filter in IMUX of a satellite receiver. Extreme delay flatness is required: 1.5 nS delay ripple over 60 % of the passband and 12 nS near the band edges. The initial design is carried out as 10 resonator symmetric cross-coupled filter with all ideal inverter couplings realizing two finite transmission zeros (FTZ) satisfying also the delay flatn...
X Band TX reject waveguide bandpass filter design for satellite communication systems
Çelebi, İrem; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2018)
For several applications such as satellite communication, filters are required since antenna systems are operating as both receiving and transmitting. There is a possibility of leakage from transmit to the receive path in these kind of systems which needs to be isolated in order to protect equipments after filter. Low loss, high isolation and bandpass characteristics are desired for the filtering, which can be validated with waveguide filters. In this study, bandpass waveguide filter design operating in X-Band f...
Citation Formats
T. E. Tuncer, “ISI-free pulse shaping filters for receivers with or without a matched filter,” presented at the IEEE International Conference on Acoustics, Speech, and Signal Processing, Orlando, FL, 2002, Accessed: 00, 2020. [Online]. Available: