In this paper we consider transmission over channels which produce intersymbol interference. New equalization schemes derived from recently proposed lattice-reduction-aided equalization of multiple-input/ multiple-output channels are presented. The schemes exhibit low complexity, require no or only very little channel state information at the transmitter, and channel coding can be immediately a...

Smart antenna using multiple antennas exploring the SDMA technology has been used in wireless communication systems which provides higher spectrum efficiency, improved link quality and throughput through frequency reuse, reduction of intersymbol interference (ISI) and co-channel interference rejection (CCI)[1]. Space Division Multiple Access, where multiple user signals are simultaneously trans...

This paper is based on an Offset Quadrature Amplitude Modulation (OQAM) Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme that is operated without a Cyclic Prefix (CP), where the multiple transmitting antennas are employed to substantially reduce the inherent intersymbol and intercarrier interference. The proposed scheme avoids the use of the CDMA technology to get rid of th...

A noncoherent Gaussian minimum phase-shift keying (GMSK) detector using differential phase detection combined with the soft-output Viterbi algorithm (SOVA) is presented. This approach overcomes the severe intersymbol interference (ISI) of GMSK signals with low BtT . Unlike conventional detectors the SOVA produces soft-decision bits resulting in larger coding gains in subsequent convolutional de...

The members of the Committee appointed to examine the dissertation of TAIKUN CHENG find it satisfactory and recommend that it be accepted. Chair ii ACKNOWLEDGEMENTS I would like to express my sincere gratitude to my advisor, Dr. Benjamin Belzer for his invaluable guidance and consistent support through out the time it took me to complete this research and write the dissertation in Washington St...

Partial-response (PR) signaling is used to model communications channels with intersymbol interference (ISI) such as the magnetic-recording channel and the copper-wire channel for digital subscriber lines. Coding for improving noise immunity in higher order partial-response channels, such as the “extended” class-4 channels denoted EPR4, EPR4, EPR4, has become an important subject as the linear ...

In 1972, Forney proposed a maximum likelihood sequence estimator for digital PAM (pulse amplitude modulated) signals in the presence of nite intersymbol interference (ISI) and additive white Gaussian noise. This optimum scheme involves passing the received signal through a so-called whitened linear matched lter, sampling the lter output at the symbol rate, and processing the resulting sequence ...

In this paper we study differential detection of binary differential phase shift keyed (DPSK) signals with several impairments typical in satellite communication systems. In pariicjlar; the bit error rate is determined for bit timing error and frequency offset error at the receiver. The effect of a hard-limiting, band-limited repeater is also considered. The differential detector performance is...

A new and efficient class of nonlinear equalizers is developed for intersymbol interference (ISI) channels. These “iterated-decision equalizers” use an optimized multipass algorithm to successively cancel ISI from a block of received data and generate symbol decisions whose reliability increases monotonically with each iteration. These equalizers have an effective complexity comparable to the d...

During initialization, discrete multitone receivers train a time domain equalizer (TEQ) to shorten the channel impulse response to a preset length, ν + 1. Arslan, Kiaei, and Evans report a Minimum Intersymbol Interference (Min-ISI) method for TEQ design. Min-ISI TEQs give the highest bit rates among single-FIR TEQs amenable to real-time implementation on programmable fixed-point digital signal ...