Performance of Combined Constellation Rearrangement and Space-Time Block Coding Scheme for Multi-Level Modulation

Gidlund, Mikael

doi:10.1109/pimrc.2007.4394396

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…Otomatik tekrar istegi kullanılan sistemler için her tekrarda alınacak sinyal kümesişekillendirmesi [5]'te çalışılmıştır. Çoklu verici anteni olan durumlarda uzay-zaman kodlarının ve sinyal kümesişekillendirmesinin birlikte kullanıldıgı durumlar [6]'da incelenmiştir.İşbirlikli röleli aglarda sinyal kümesi sekillendirmesi en iyilemesi [7], [8] ve [9]'da çalışılmıştır. Sinyal kümesişekillendirmesi için kapalı formda sembol hata oranı formülü elde etmek zor oldugundan, genelde performansı ya üst sınırlar üzerinden ya da toplanır beyaz Gauss gürültüsü kanalları için analiz edilmiştir [10], [11].…”

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Constellation rearrangement for 4-PAM repetition coding

Çankaya

Yüksel

2014

2014 22nd Signal Processing and Communications Applications Conference (SIU)

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Özetçe -Sönümlü kanallarda çeşitleme kazancını saglamak için gönderilen bilgiler zamanda veya frekansta tekrarlanabilir. Tekrarlanan her iletimde aynı sinyal kümesini kullanmak yerine sinyal kümesişekillendirmesi yapılabilir. Bu yöntemde sembollerle sinyal uzayındaki noktalar her çeşitleme dalı için farklı seçilebilir. Diger yandan, güç aktarımı başarımı artıran ikinci bir yöntemdir. Bu makalede 4-darbe genlik kiplemesi sinyal kümelerinin kullanıldıgı tekrarlama kodu ile sinyal kümesişekillendirmesi sabit ve en iyi güç aktarımı altında karşılaştırılmıştır. Kazançların önemli bir kısmının sinyal kümesişekillendirmesinden kaynaklandıgı, güç aktarımının yararının sınırlı oldugu gözlemlenmiştir. Anahtar Kelimeler-Sinyal kümesişekillendirmesi, tekrarlama kodu, verici çeşitlemesi, güç paylaşımıAbstract-In fading channels to get diversity gain, transmitted data can be repeated in time or frequency. Constellation reaarangement can be used instead of using the same signal constellation for each repeated transmission. In this method, symbols and the points in the signal space can be chosen differently for each one of the diversity branches. On the other hand, power allocation is another method that improves the performance. In this paper, repetition coding that uses signal constellations of 4-pulse amplitude modulation and signal constellation reaarangement are compared for both fixed and optimal power allocation. It is observed that most of the gain is due to constellation rearrangement and advantages of power allocation are limited.

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Constellation rearrangement for 4-PAM repetition coding

Çankaya

Yüksel

2014

2014 22nd Signal Processing and Communications Applications Conference (SIU)

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Performance of Cooperative Spatial Multiplexing SISO/MIMO Communication Systems with Constellation Rearrangement technique

2013

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Optimized Nonuniform Constellation Rearrangement for Cooperative Relaying

Sediq

Djukic

Yanıkömeroğlu

et al. 2011

IEEE Trans. Veh. Technol.

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The performance of cooperative relaying networks can be significantly enhanced by using constellation rearrangement (CoRe). In CoRe, the base-station and the relay-station use different constellations, each having the same number of signal points, to communicate with the user terminal. A number of CoRe schemes have been proposed in the literature based on uniform quadrature-amplitude modulation (QAM) constellations. However, it is still unclear whether nonuniform QAM constellations can further enhance the performance of CoRe. Toward this end, we investigate the problem of designing the optimum nonuniform QAM constellations for CoRe. Our motivation is that nonuniform constellations have the potential to outperform their uniform counterparts because the set of nonuniform constellations is a superset of uniform constellations. Nonuniform QAM constellations can be categorized as either decomposable or nondecomposable. Unlike nondecomposable QAM constellations, decomposable QAM constellations are generated from the Cartesian product of two pulse-amplitude modulation (PAM) constellations. We formulate an optimization problem to find the nonuniform constellations that have the minimum union bound on the uncoded symbol error rate (SER). Using convex analysis, we devise a search method to find globally optimum nonuniform decomposable constellations. We also devise a simple heuristic to find good locally optimum nonuniform nondecomposable constellations, which perform better than their decomposable counterparts.

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Performance of Combined Constellation Rearrangement and Space-Time Block Coding Scheme for Multi-Level Modulation

Cited by 4 publications

References 10 publications

Constellation rearrangement for 4-PAM repetition coding

Constellation rearrangement for 4-PAM repetition coding

Performance of Cooperative Spatial Multiplexing SISO/MIMO Communication Systems with Constellation Rearrangement technique

Optimized Nonuniform Constellation Rearrangement for Cooperative Relaying

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