Multimedia Protocol Network with Flexible Network Configuration

在会展现场，每个展会的展位布局都会发生变化，网络配置也需要随之改变。对于这些情况，展台上的终端被频繁地添加和移除。我们研究的网络具有灵活的网络变化特性，并且能够为终端提供公平和优先的带宽分配。该网络由连接每个展位终端的子网络和连接子网络的全局桥网络组成。该网络具有环回重传机制，即使在桥接器的缓存溢出时也能消除分组丢失。在所提出的系统中，时隙在其报头中具有回送比特。如果网桥的缓冲区溢出，网桥的接收时隙将被转发到下一个网桥，并将环回位设置为1。如果时隙终结器接收到环回位设置为1的时隙，则它将使用环回…重新传输接收到的时隙反向通道上的更多重置。通过重复LOPHACK，在桥接器发生缓存溢出的情况下，无论是在子网还是在桥接网中都不会发生时隙丢弃。与传统的接收端在检测到消息丢失时请求重传的系统相比，该系统可以降低时延。在无线网络中，多媒体信息的传输采用了各种调制方式，识别调制方式非常重要。提出了一种基于接收信号联合矩的调制识别方法，并对调制识别的误码率进行了分析，提出了一种基于正交频分复用的调制识别方法，以实现无线网络中的高速通信和高服务质量。然而，由于ofdm具有较高的峰值功率，导致放大效率低下。为了降低峰值功率，我们提出了相位旋转的方法，并通过相位旋转显示了对峰值功率的抑制效果。较少

In exhibition sites, the booth layout is changed for each exhibition and the network configuration is required to be changed according to it. For those situations the terminals at booths are added and removed frequently. We investigate the network with flexible characteristics for network change and capable of giving both fair and prioritized bandwidth allocation for the terminals. The proposed network is composed of the subnetworks connecting the terminals at each booth and global bridge network connecting subnetworks. The proposed network has a loopback retransmission mechanism in order to eliminate the packet loss even when the buffer memory at the bridge overflows. In the proposed system, the slot has a loopback bit in its header. If the buffer of the bridge overflows, the received slot at the bridge is relayed to the next bridge with the loopback bit set to 1. If the slot terminator receives a slot with the loopback bit set to 1, it retransmits the received slot with the loopback … More reset on the reverse channel. By repeating the loophacks the slot discarding does not occur both in subnetworks and bridgenetwork if the buffer memoriy overflow occurs at the bridge.We also propose a loopback retransmission between routers for reliable multicast communication network. The proposed system can reduce the delay compared with the conventional systems in which the receivers request retransmission whenever detecting message loss.In a radio network, various modulations are employed to transmit multimedia information, and it is important to identify the modulations. We propose a modulation identification method based on joint moments of a received signal, and analyze the modulation identification error probability.An orthogonal frequency division multiplexing (OFDM) is attractive to realize high speed communications and to obtain a high QoS in the radio network. However the OFDM has a high peak power and it causes an inefficient amplification. To reduce the peak power, we propose the phase rotation method and show the peak power suppression effects by the phase rotation. Less