Sensory maps are often distorted representations of the environment, where ethologically-important ranges are magnified. The implication of a biased representation extends beyond increased acuity for having more neurons dedicated to a certain range. Because neurons are functionally interconnected, non-uniform representations influence the processing of high-order features that rely on compariso...

An adaptive iterative receiver for layered spacetime coded (LSTC) systems is proposed. The proposed receiver, based on a joint adaptive iterative detection and decoding algorithm, adaptively suppresses and cancels co-channel interference. The LMS algorithm and maximum a posteriori (MAP) algorithm are utilized in the receiver structure. A partially filtered gradient LMS (PFGLMS) algorithm is als...

In this paper we present a new space time transmit diversity (STTD) scheme for M≥4 transmit antennas and one receive antenna. The new diversity scheme belongs to the open loop class and consists of an extension to the work presented in [1,2,3]. Another hybrid scheme that combines open and close loop classes is also presented. The coding rate of the new scheme is one and in spite of the presence...

We consider a space time coding system. We propose to detect symbols of the each user and estimate the channel iteratively. The channel gets estimated blindly via Expectation Maximization (EM) algorithm by formulating the problem as Gaussian mixture model (GMM). The estimated channel is then used to detect the symbols for each user, which is also done in an iterative fashion, i.e., user-wise de...

This paper described the design and implementation of a prototype transmitter and a prototype demodulator/decoder for space-time coded SOQPSK-TG for aeronautical telemetry. The design exercise showed that the space-time coding concept can be reduced to hardware. The laboratory bit error rate tests showed that the performance of the prototype demodulator in a 2-transmit/1-receive antenna configu...

This paper explores the extensions of the Alamouti code to frequency selective channels. The Lindskog-Paulraj (LP) extension to frequency selective channels as well as the Diggavi, Al-Dhahir and Calderbank extension to multiple users will also be covered. The schemes will be shown both in D-domain and its corresponding version using finite block length matrices. Finally, simulations are done us...

Network coding has been recently proposed as a new promising technique that can potentially improve the performance of a wireless multi-hop network significantly. However, most existing studies in this field perform network coding without considering the interplay between transmission power/rate and network coding gain. In many scenarios, the selection of the transmission power/rate brings big ...

Multi-antenna communication systems with OFDM modulation have the potential to play an important role in the design of the next generation broadband wireless communication systems. In this paper, we propose a general framework for the performance analysis of space-timefrequency coded MIMO-OFDM systems. Our approach incorporates the space-time and space-frequency coding approaches as special cas...

The development of broadband wireless communication systems must cope with various performancelimiting challenges that include channel fading as well as size and power limitations at the mobile units. As a promising method dealing with these challenges, spacetime coding is effective in supporting reliable, high-data rate transmissions: the major goal in broadband wireless communications. Space-...