A new pulse shaped frequency division multiplexing technique for doubly dispersive channels

There is a growing demand for higher data rate systems that can function in a highly mobile environment. This mandates designs suited to doubly selective channels. This paper presents a pulse-shaped frequency-division multiplexing (PS-FDM) scheme for transmission over doubly-dispersive channels. The pulse shapes are designed to yield an intersymbol interference (ISI)/intercarrier interference (ICI) profile matching a given target response. The receiver relies on a high-performance/low-complexity equalizer based on the maximum likelihood (ML) criterion to reliably extract the transmitted symbols from the observations in the presence of controlled amounts of interference in the target response. In order to protect the transmitted information against subcarrier nulls, a convolutional code is used at the transmitter. The equalizer exchanges soft information with a maximum a-posteriori probability (MAP) optimal decoder in a turbo-like fashion at the receiver. Simulations suggest that turbo-equalization with the linear complexity iterative equalizer offers significant performance enhancements over standard techniques.

[1]  Georgios B. Giannakis,et al.  Bounding performance and suppressing intercarrier interference in wireless mobile OFDM , 2003, IEEE Trans. Commun..

[2]  S. Weinstein,et al.  Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform , 1971 .

[3]  Philip Schniter,et al.  Low-complexity equalization of OFDM in doubly selective channels , 2004, IEEE Transactions on Signal Processing.

[4]  Philip Schniter.  On the design of non-(bi)orthogonal pulse-shaped FDM for doubly-dispersive channels , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[5]  John G. Proakis,et al.  Digital Communications , 1983 .

[6]  Cyril Leung,et al.  Matched filter bound for OFDM on Rayleigh fading channels , 1995 .

[7]  Phil Schniter.  A New Approach to Multicarrier Pulse Design for Doubly-Dispersive Channels , 2005 .

[8]  Krishna R. Pattipati,et al.  A PDA-Kalman approach to multiuser detection in asynchronous CDMA , 2002, IEEE Communications Letters.

[9]  Suhas N. Diggavi,et al.  Intercarrier interference in MIMO OFDM , 2002, IEEE Trans. Signal Process..

[10]  Andrew C. Singer,et al.  Minimum mean squared error equalization using a priori information , 2002, IEEE Trans. Signal Process..

[11]  Zhi Tian,et al.  Near-optimum soft decision equalization for frequency selective MIMO channels , 2004, IEEE Trans. Signal Process..

[12]  Akbar M. Sayeed,et al.  Joint multipath-Doppler diversity in mobile wireless communications , 1999, IEEE Trans. Commun..

[13]  John Cocke,et al.  Optimal decoding of linear codes for minimizing symbol error rate (Corresp.) , 1974, IEEE Trans. Inf. Theory.