In recent times, there has been growing interests in integration of voice, data and video traffic in wireless communication networks. With these growing interests, WCDMA has immerged as an attractive access technique....In recent times, there has been growing interests in integration of voice, data and video traffic in wireless communication networks. With these growing interests, WCDMA has immerged as an attractive access technique. The performance of WCDMA system is deteriorated in presence of multipath fading environment. The paper presents space-time coded minimum mean square error (MMSE) Decision Feedback Equalizer (DFE) for wideband code division multiple access (WCDMA) in a frequency selective channel. The filter coefficients in MMSE DFE are optimized to suppress noise, intersymbol interference (ISI), and multiple access interference (MAI) with reasonable system complexity. For the above structure, we have presented the estimation of BER for a MMSE DFE using computer simulation experiments. The simulation includes the effects of additive white Gaussian noise, multipath fading and multiple access interference (MAI). Furthermore, the performance is compared with standard linear equalizer (LE) and RAKE receiver. Numerical and simulation results show that the MMSE DFE exhibits significant performance improvement over the standard linear equalizer (LE) and RAKE receiver.展开更多
WCDMA(W ideband Code D ivision Mu ltip le Access)系统的一个重大挑战,就是在保证服务质量的前提下,承载各种不同类型的业务。为此,在对WCDMA网络的QoS(Quality of Service)和QoE(Quality of End-user Experience)管理、网络监测和...WCDMA(W ideband Code D ivision Mu ltip le Access)系统的一个重大挑战,就是在保证服务质量的前提下,承载各种不同类型的业务。为此,在对WCDMA网络的QoS(Quality of Service)和QoE(Quality of End-user Experience)管理、网络监测和优化等问题进行研究的基础上,分析了几种网络配置以及实时业务向不同QoS等级映射的问题,给出了优先选择方法区分服务模型。结果表明,该模型系统能以最符合成本效益的方法承受QoS实时服务,灵活地处理区分服务业务,QoS测试结果验证了预期优先选择方法的优越性。运用优先选择方法后,网络的频谱利用率达到32%;区分服务模型使网络的资源使用能力提高了23%。展开更多
文摘In recent times, there has been growing interests in integration of voice, data and video traffic in wireless communication networks. With these growing interests, WCDMA has immerged as an attractive access technique. The performance of WCDMA system is deteriorated in presence of multipath fading environment. The paper presents space-time coded minimum mean square error (MMSE) Decision Feedback Equalizer (DFE) for wideband code division multiple access (WCDMA) in a frequency selective channel. The filter coefficients in MMSE DFE are optimized to suppress noise, intersymbol interference (ISI), and multiple access interference (MAI) with reasonable system complexity. For the above structure, we have presented the estimation of BER for a MMSE DFE using computer simulation experiments. The simulation includes the effects of additive white Gaussian noise, multipath fading and multiple access interference (MAI). Furthermore, the performance is compared with standard linear equalizer (LE) and RAKE receiver. Numerical and simulation results show that the MMSE DFE exhibits significant performance improvement over the standard linear equalizer (LE) and RAKE receiver.
文摘WCDMA(W ideband Code D ivision Mu ltip le Access)系统的一个重大挑战,就是在保证服务质量的前提下,承载各种不同类型的业务。为此,在对WCDMA网络的QoS(Quality of Service)和QoE(Quality of End-user Experience)管理、网络监测和优化等问题进行研究的基础上,分析了几种网络配置以及实时业务向不同QoS等级映射的问题,给出了优先选择方法区分服务模型。结果表明,该模型系统能以最符合成本效益的方法承受QoS实时服务,灵活地处理区分服务业务,QoS测试结果验证了预期优先选择方法的优越性。运用优先选择方法后,网络的频谱利用率达到32%;区分服务模型使网络的资源使用能力提高了23%。
