Zhenfeng He

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When using an adaptive modulation and coding scheme over multicode CDMA transmission channels, the High Speed Downlink Packet Access (HSDPA) allocates rates equally over parallel channels to provide a wide range of data rates. However, the HSDPA system uses the radio resources inefficiently and suffers from severe performance loss when encountering(More)
This paper studies an efficient radio resource allocation method for the multicode transmission of High-Speed Downlink Packet Access system. The current HSDPA system allocates equal data rates to multiple channels, causing an inefficient use of radio resources in multipath fading channel. To maximize the system throughput subject to limited radio resources,(More)
The current High Speed Downlink Packet Access (HSDPA) system with the Quadrature Amplitude Modulation (QAM) allocates equal data rates to multiple codes for link adaptation which causes large quantization loss in the total data rates. The 2 group allocation method proposed in [1] significantly reduces the quantization loss by optimally adjusting the data(More)
A modified two-group resource allocation scheme is tested with three channel ordering schemes, a hard decision parallel interference cancellation (HDPIC) scheme and a successive interference cancellation (SIC) scheme to improve the data rate. Channel ordering ensures channels with the lowest energy requirement are loaded with the higher data(More)
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