کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
449272 693655 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cross-layer adaptive modulation and coding design for space-time block coded MIMO–OFDM systems
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
Cross-layer adaptive modulation and coding design for space-time block coded MIMO–OFDM systems
چکیده انگلیسی

This paper developed a cross-layer adaptive modulation and coding (AMC) design for space-time block coded (STBC) MIMO–OFDM systems, which combines the AMC at the physical layer with an automatic repeat request (ARQ) protocol at the data link layer, in order to maximize spectral efficiency under specified delay and packet error ratio (PER) constraints. The transmission mode for each subcarrier is updated frame-by-frame to match the time-varying channel conditions, in order to take full advantage of the OFDM systems. The proposed cross-layer AMC design is also incorporated with STBC to further improve the system performance. Numerical results have demonstrated that retransmission at the data link layer alleviate rigorous error-control requirements at the physical layer and thereby allows higher data rate transmission. It is shown that this cross-layer design has achieved considerable spectral efficiency gain in comparison with traditional AMC without cross-layer design. Note that increasing the maximum number of retransmissions beyond one has little effect on spectrum efficiency and will cause longer system delay. This suggests that a desirable trade-off between spectral efficiency and delay in the STBC MIMO–OFDM system is achieved by a small number of retransmission.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computer Communications - Volume 32, Issue 3, 25 February 2009, Pages 540–545
نویسندگان
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