Balance power control is based on the idea of balancing Carrier to Interference Ratio (CIR) of all wireless links. Unbalance power control means that different traffics can achieve different CIR at receivers. This pap...Balance power control is based on the idea of balancing Carrier to Interference Ratio (CIR) of all wireless links. Unbalance power control means that different traffics can achieve different CIR at receivers. This paper proposes a forward link partial-balance power control algorithm, which can provide necessary Quality of Service (QoS) for multimedia traffics in Wideband CDMA(W-CDMA) systems. The proposed algorithm is the integration of grading traffics priority and allocating and adjusting forward link power levels. For higher priority traffics, the unbalance power control is used. Whereas for lower priority traffics, balance power control is adopted. Computer simulation results show that the proposed algorithm can guarantee the special QoS requirements of the traffics with higher priority orders and maximize the CIR of the traffics with lower priority orders.展开更多
This paper evaluates the effect of decision feedback equalizer( DFE) error propagation for400 Gb/s Ethernet( 400 GbE) electrical link in order to propose some effective methods to improve bit error rate( BER). First,a...This paper evaluates the effect of decision feedback equalizer( DFE) error propagation for400 Gb/s Ethernet( 400 GbE) electrical link in order to propose some effective methods to improve bit error rate( BER). First,an analytical model for DFE burst error length distribution is proposed and simulated based on a NRZ electrical link in which a 5-tap DFE combined with a multiple-tap feed forward equalizer( FFE) is included. Then,a detailed derivation for BER considering DFE error propagation is given based on the distribution of burst error run length and the BER performance with and without forward error correction( FEC) is simulated too. After that,this paper investigates several MUX-based FEC interleaving methods including their complexity and latency in order to improve BER further. At last,three FEC interleaving schemes are compared not only in interleaving gain,but also in hardware complexities and latencies. Simulation results show that pre-interleave bit muxing can obtain good tradeoff between BER and complexity for 400 Gb E electrical link.展开更多
尽管基于贪婪转发(greedy forwarding,GF)地理路由广泛应用于车载网(vehicular ad hoc networks,VANETs),但仍存在链路稳定性不足的问题。为此,提出基于期望传输次数(expected transmission count,ETX)链路质量感知的方向贪婪转发的地...尽管基于贪婪转发(greedy forwarding,GF)地理路由广泛应用于车载网(vehicular ad hoc networks,VANETs),但仍存在链路稳定性不足的问题。为此,提出基于期望传输次数(expected transmission count,ETX)链路质量感知的方向贪婪转发的地理路由协议(ETX-based link quality aware directional greedy forwarding geographic routing,ETX-DGF)。利用距离、节点移动方向以及链路质量计算每个节点的转发权值,利用经典的ETX估计链路质量,将具有最小转发权值的邻居节点选为下一跳转发节点。实验结果表明,ETX-DGF协议降低了数据包丢失率,提高了网络吞吐量。展开更多
文摘Balance power control is based on the idea of balancing Carrier to Interference Ratio (CIR) of all wireless links. Unbalance power control means that different traffics can achieve different CIR at receivers. This paper proposes a forward link partial-balance power control algorithm, which can provide necessary Quality of Service (QoS) for multimedia traffics in Wideband CDMA(W-CDMA) systems. The proposed algorithm is the integration of grading traffics priority and allocating and adjusting forward link power levels. For higher priority traffics, the unbalance power control is used. Whereas for lower priority traffics, balance power control is adopted. Computer simulation results show that the proposed algorithm can guarantee the special QoS requirements of the traffics with higher priority orders and maximize the CIR of the traffics with lower priority orders.
基金Supported by the National Natural Science Foundation of China(No.61471119)
文摘This paper evaluates the effect of decision feedback equalizer( DFE) error propagation for400 Gb/s Ethernet( 400 GbE) electrical link in order to propose some effective methods to improve bit error rate( BER). First,an analytical model for DFE burst error length distribution is proposed and simulated based on a NRZ electrical link in which a 5-tap DFE combined with a multiple-tap feed forward equalizer( FFE) is included. Then,a detailed derivation for BER considering DFE error propagation is given based on the distribution of burst error run length and the BER performance with and without forward error correction( FEC) is simulated too. After that,this paper investigates several MUX-based FEC interleaving methods including their complexity and latency in order to improve BER further. At last,three FEC interleaving schemes are compared not only in interleaving gain,but also in hardware complexities and latencies. Simulation results show that pre-interleave bit muxing can obtain good tradeoff between BER and complexity for 400 Gb E electrical link.
文摘尽管基于贪婪转发(greedy forwarding,GF)地理路由广泛应用于车载网(vehicular ad hoc networks,VANETs),但仍存在链路稳定性不足的问题。为此,提出基于期望传输次数(expected transmission count,ETX)链路质量感知的方向贪婪转发的地理路由协议(ETX-based link quality aware directional greedy forwarding geographic routing,ETX-DGF)。利用距离、节点移动方向以及链路质量计算每个节点的转发权值,利用经典的ETX估计链路质量,将具有最小转发权值的邻居节点选为下一跳转发节点。实验结果表明,ETX-DGF协议降低了数据包丢失率,提高了网络吞吐量。
