In [1], the authors have proposed one high rate transmission scheme for Space-Time Block Codes (STBC) without additional system source such as power, bandwidth and time slot. To maintain the full rank property of the ...In [1], the authors have proposed one high rate transmission scheme for Space-Time Block Codes (STBC) without additional system source such as power, bandwidth and time slot. To maintain the full rank property of the coding gain matrix, we propose a set of STBCs for 4 transmit antennas transmission to transmit one additional information bit achieving rate-9/8. Another orthogonal STBC code with rate-1 is proposed in this paper within the set. It shows by computer simulation results that by employing the set of STBCs, it achieves better bit error rate (BER) performance and?throughput than that of [1] with a valid BER improvement at the high SNR region above 20dB.展开更多
为了解决TCP(transmission control protocol)和UDP(user datagram protocol)在诸如卫星信道和无线信道等高误码率信道中遇到的问题,提出了一种基于跨层设计的简单可靠UDP协议。通过增加2个字节的包头建立了确认机制和重传机制,保证了...为了解决TCP(transmission control protocol)和UDP(user datagram protocol)在诸如卫星信道和无线信道等高误码率信道中遇到的问题,提出了一种基于跨层设计的简单可靠UDP协议。通过增加2个字节的包头建立了确认机制和重传机制,保证了数据包的可靠交付;通过增加1个字节的跨层信息,建立了自适应变包长机制,提高了协议效率。分析和仿真结果表明,该协议兼有UDP协议高效和TCP协议保证可靠交付的优点,可以很好地适用于卫星、无线等高误码率信道。展开更多
文摘In [1], the authors have proposed one high rate transmission scheme for Space-Time Block Codes (STBC) without additional system source such as power, bandwidth and time slot. To maintain the full rank property of the coding gain matrix, we propose a set of STBCs for 4 transmit antennas transmission to transmit one additional information bit achieving rate-9/8. Another orthogonal STBC code with rate-1 is proposed in this paper within the set. It shows by computer simulation results that by employing the set of STBCs, it achieves better bit error rate (BER) performance and?throughput than that of [1] with a valid BER improvement at the high SNR region above 20dB.
文摘为了解决TCP(transmission control protocol)和UDP(user datagram protocol)在诸如卫星信道和无线信道等高误码率信道中遇到的问题,提出了一种基于跨层设计的简单可靠UDP协议。通过增加2个字节的包头建立了确认机制和重传机制,保证了数据包的可靠交付;通过增加1个字节的跨层信息,建立了自适应变包长机制,提高了协议效率。分析和仿真结果表明,该协议兼有UDP协议高效和TCP协议保证可靠交付的优点,可以很好地适用于卫星、无线等高误码率信道。
