Downlink Space–Time Spreading Using Interference Rejection Codes

In this paper, the authors will investigate the performance of a loosely synchronized (LS) code-based space–time spreading (STS) scheme in comparison to that of classic Walsh code and pseudonoise code-based STS when communicating over dispersive Nakagami-m multipath channels. Closed-form formulas are derived for characterizing the bit-error-rate performance as a function of the number of resolvable paths L and the number of users K. Our numerical results suggest that the employment of LS code-based STS scheme is beneficial in a low-user-load and low-dispersion channel scenario, where a near-single-user performance can be achieved without a multiuser detector. Index Terms—Code-division multiple access (CDMA), Gaussian approximation, interference-free window (IFW), large area synchronized (LAS) codes, loosely synchronized (LS) codes, Nakagami-m fading

Evaluation of coding scheme for MIMO radar

Multiple Input Multiple Output (MIMO) antenna systems have shown a great potential for wireless communication. These systems support high capacity, increased diversity and interference suppression. Recently it has been proposed MIMO constellations for Radar. MIMO Radar is not only a new research field, but also a very promising approach in terms of overcoming Radar Cross Section (RCS) fluctuations with diversity. This thesis explores the potential of coding schemes for MIMO Radar. The ambiguity functions measures related to MIMO Radar are used to evaluate how much diversity gain can be coherently achieved with certain coding schemes. The results of this analysis show that the cross correlation between the signals from different transmitters hinders achieving the full diversity gain. The code length of the used Gold codes is an important factor for this effect. However, in this thesis a coding scheme related to the Alamouti scheme in Communication is presented, this scheme under some constraints is capable of maintaining orthogonality between the signals from different transmitters and therefore cancels the mutual interference among those signals. In general, MIMO radar is a novel and ingenious approach to improve radar performance which needs to be analyzed and developed. This thesis is the first work exploring the coding schemes and the related aspects for MIMO Radar

Unified approach to complementary sequences and transforms. Part 2. Multiparameter M-complementary Golay-Rudin-Shapiro transforms

В данной работе мы разрабатываем новый унифицированный подход к синтезу обобщенных m-комплементарные последовательностей Голея-Рудина-Шапиро. Он основывается на новой итерационной генерирующей конструкции, введенной в первой части работы.In this paper we develop a new unified approach to the so-called generalized mcomplementary Golay-Rudin-Shapiro (GRS) sequences. It based on a new generalized iteration generating construction, introducted in the first part of this work

New multi-parameter Golay 2-complementary sequences and transforms

In this work, we develop a new unified approach to the so-called generalized Golay- Rudin-Shapiro (GRS) 2-complementary multi-parameter sequences. It is based on a new generalized iteration generating construction. © 2018 Institute of Physics Publishing. All rights reserved.This work was supported by the RFBR grant 17-07-00886 and by the Ural State Forest Engineering’s Center of Excellence in”Quantum and Classical Information Technologies for Remote Sensing Systems”