Analysis of transmit antenna selection/orthogonal space‐time block coding with receive selection and combining in the presence of feedback errors

Abstract

Examining the effect of imperfect transmit antenna selection (TAS) caused by the feedback link errors on the performance of hybrid TAS/orthogonal space‐time block coding (OSTBC) with single receive antenna selection (i.e., joint transmit and receive antenna selection (JTRAS)/OSTBC) and TAS/OSTBC (with receive maximal‐ratio combining‐like combining structure) over slow and frequency‐flat Nakagami‐m fading channels is the main objective of this paper. Under ideal channel estimation and delay‐free feedback assumptions, statistical expressions and several performance metrics related to the post‐processing signal‐to‐noise ratio are derived by defining a unified system model concerning both JTRAS/OSTBC and TAS/OSTBC schemes. Exact analytical expressions for outage probability (OP) and bit/symbol error rates of M‐ary modulations are presented in order to provide a detailed examination on the OP and error performances of the unified system that experiences feedback errors. Also, the asymptotic diversity order analysis, which shows that the diversity order of the investigated schemes is equal to the diversity order provided by OSTBC transmission itself, is included in the paper. Moreover, we have validated the theoretical results via Monte Carlo simulations. Copyright © 2014 John Wiley & Sons, Ltd.

Conventional and modified TAS/OSTBC schemes in dual‐hop fixed‐gain amplify‐and‐forward relaying systems with imperfect feedback

“…They have been included in wireless communications system proposals within 3GPP LTE, WiMax, 4G, HSPA+, and IEEE 802.11n (Wi‐Fi) while also being the promising components of the forthcoming standards. Besides, in order to examine the feasibility of diversity schemes in the real‐world communications applications, and to exhibit the robustness of these schemes to erroneous conditions, researches have been canalized on practical issues such as channel estimation error , feedback delay , feedback error (FE) , spatial correlation , and keyhole effect .…”

“…In the literature related to single‐hop communications, there are many work that focus on the pure orthogonal space‐time block coding (OSTBC) and its hybrid version constructed by combining with transmit antenna selection (TAS). Almost all researches on the hybrid TAS/OSTBC schemes have examined the conventional antenna‐subset selection case that has been shown to achieve the optimal communications reliability in ideal feedback and channel estimation conditions.…”

Modified transmit antenna selection/orthogonal space-time block coding scheme with reduced feedback-rate and robust performance in the presence of feedback errors

“…Anten seçimi tekniklerini kullanarak oluşturulan TAS&MRC [3], TAS/OSTBC [4], [5] ve MRT&RAS [6] yapıları, gerçek telsiz haberleşme sistemlerine/uygulamalarına uygunluklarının araştırılması amacıyla kanal kestirim hatası (channel estimation error (CEE)), geribesleme gecikmesi (feedback delay (FD)) ve geribesleme hatası (feedback error (FE)) gibi pratik durumlar için incelenmiştir. [6], hibrit çeşitleme yapısı MRT&RAS'ın CEE ve FD varlıgı durumunda Nakagamim sönümlemeli kanallardaki performansını incelemiştir.…”

“…Verici anten sayısının herhangi bir tamsayı deger alabildigi daha genel durum için, [7]'de aşagılink fırsatçı planlama yapısı, Rayleigh sönümlemeli kanallarda 978-1-4673-5563-6/13/$31.00 2013 IEEE FE varlıgında incelenmiştir. [7] çalışmasına benzer şekilde, herhangi verici anten sayısı degeri için, TAS/OSTBC ve JTRAS/OSTBC yapılarının Nakagami-m kanallardaki kesinti olasılıgı ve bit/sembol hata olasılıgı (bit/symbol error rate (BER/SER)) ifadeleri [4]'te sunulmuştur. [4], [5] ve [7]'de performansölcütleri geribesleme kanalının ikili simetrik kanal (binary symmetric channel (BSC)) oldugu kabulü altında elde edilmiştir.…”

“…[7] çalışmasına benzer şekilde, herhangi verici anten sayısı degeri için, TAS/OSTBC ve JTRAS/OSTBC yapılarının Nakagami-m kanallardaki kesinti olasılıgı ve bit/sembol hata olasılıgı (bit/symbol error rate (BER/SER)) ifadeleri [4]'te sunulmuştur. [4], [5] ve [7]'de performansölcütleri geribesleme kanalının ikili simetrik kanal (binary symmetric channel (BSC)) oldugu kabulü altında elde edilmiştir. [8]'de ise, BSC modeline göre daha gerçekçi bir geribesleme kanal modeli için FE durumunda klasik TAS/G 2 -OSTBC yapısına göre dahaüstün bir hata performansı sergileyen modifiye TAS/G 2 -OSTBC (M-TAS/G 2 -OSTBC) yapısı Nakagami-m sönümlemeli kanallarda incelenmiştir.…”