Space-time code diversity by phase rotation in multi-carrier multi-user systems

Space-time code diversity by phase rotation in multi-carrier multi-user systems

Code diversity using space-time block codes was developed for single-carrier and single-receiver systems. In this paper, the extension of code diversity by phase rotation to multi-user and multi-carrier systems is proposed and analyzed. We show that code diversity with reduced feedback is possible in this new scenario and the coding gain has a mild logarithmic decrease with the number of users ...

investigation of single-user and multi-user detection methods in mc-cdma systems and comparison of their performances

در این پایان نامه به بررسی روش های آشکارسازی در سیستم های mc-cdma می پردازیم. با توجه به ماهیت آشکارسازی در این سیستم ها، تکنیک های آشکارسازی را می توان به دو دسته ی اصلی تقسیم نمود: آشکارسازی سیگنال ارسالی یک کاربر مطلوب بدون در نظر گرفتن اطلاعاتی در مورد سایر کاربران تداخل کننده که از آن ها به عنوان آشکارساز های تک کاربره یاد می شود و همچنین آشکارسازی سیگنال ارسالی همه ی کاربران فعال موجود در...

Performance Analysis of Orthogonal Space Time Block Code and Transmission Antenna Selection with Multi User Diversity

This paper presents the average capacity and error performance of 3×4 orthogonal space time block code (OSTBC) and transmits antenna selection (TAS) with multiple antennas. In TAS scheme, we consider one transmit antenna is selected for transmit signals at the secondary transmitters and the secondary receiver applies the maximum likelihood (ML). In 3×4 OSTBC scheme, we consider three transmit a...

Multi-user Decision-feedback Space-time Equalization and Diversity Reception

| This paper investigates optimum in nitelength multi-user decision-feedback space-time equalization implemented with cross-feedback lters in order to remove not only post-cursor ISI but also postcursor CCI. Closed-form expressions are derived for the optimal feedforward and feedback lters as well as the minimum achievable MSE (mean-square error) as a function of channel spectra for a one-anten...

Single- and Multi-Carrier CDMA Multi-User Detection, Space-Time Spreading, Synchronisation and Standards