t He is currently with NTT ABSTRACT This paper proposes automatic repeat request (ARQ) protocols combined with an adaptive modulation system(AMS) (ARQ/AMS) to achieve high throughput data transmission for wireless multimedia communication services. First, this paper analyses the cause of throughput limitation of the conventional fixed modulation ARQ system, and discuss basic strategies to improve throughput performance by effectively combining ARQ and AMs. Next, this paper proposes a selective repeat ARQ (SR-ARQ) with A M s (SR-ARQIAMS), and shows its throughput performance improvement effect. Finally, this paper proposes a type-I1 hybrid ARQ with a punctured convolutional coding combined with the AMs (type4 hybrid ARQ/AMS) to further improve throughput performance. Computer simulation confirms that the proposed type-I1 hybrid ARQ/AMS can achieve higher throughput performances than the conventional selective repeat ARQ with QPSK under any channel conditions.
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