This paper proposes a new cooperative GBN-ARQ(Go-Back-N Cooperative Automatic Repeat Request: GBN-CARQ)algorithm which is suitable for the single source and single relay wireless communication system based on TDMA, establishing the queuing model of single source and single relay wireless communication system based on TDMA and providing the expressions of its throughput and delay performance. By comparing with GBN-ARQ algorithm and normal cooperative ARQ(Cooperative ARQ:CARQ)algorithm, it is shown that GBN-CARQ algorithm has better average throughput performance.
Abslmct-With the recent development of the information highway, the Internet is rapidly reaching major medical centers, peripheral hospitals and clinics, and homes of physicians and patients. This connection provides a unique opportunity to transmit physiological data through the Internet for diagnosis, monitoring, and analysis by dedicated computers connected to the Internet. The efficient transmission of this type of data has bewme a significant problem. In this paper we present a multiresolution approach based on powerful combination of the lifting scheme and the SPIHT coding algorithm. This approach enables the rate of transmission to be adapted to the receiving device so that the unnecessary portion of the data is never sent.It also allows a lossless transmission, and is capable of re constructing essential waveforms of the data even when the network halts after a certain period of transmission.
Space-time (ST) coding offers an effective transmit diversity technique to combat fading, but most existing space-time coding schemes assume flat fading channels that may not he valid for wideband wireless mobile communications. For multiuser transmissions over multipath environment (frequencyselective fading channel), ST coding is challenging due to the presence of not only MA1 (multiple access interference) but also IS1 (intersymbol interference) .In this paper, a novel ST block coding scheme based on block processing is proposed for TD-CDMA systems in frequency-selective channels, and block linear joint detection algorithms are developed. Then, we simplify these algorithms and get a low cost hut good performance joint detection algorithm for spacetime block-coded TD-CDMA systems.
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