发明名称 |
INTERFERENCE ESTIMATION IN CDMA SYSTEMS USING ALTERNATIVE SCRAMBLING CODES |
摘要 |
<p>Methods and apparatus that improve interference (Iota) estimation in CDMA systems in which the DPCH is sorted under a scrambling code different from the scrambling code of a channel such as the CPICH are described. In such systems, DPCH Iota-estimation cannot be done by measuring on the CPICH and transforming to the DPCH due to the different interference situations on the two channels. Instead, the DPCH interference is estimated by using knowledge of empty channelization codes in the alternative or secondary scrambling code that can be used for Iota estimation, or using symbols (e.g., control symbols on the DPCCH) on the DPCH, or searching for an empty channelization code and using a found empty code for Iota-estimation.These techniques improve the SIR estimate in comparison to prior techniques and hence also improve the performance of power control, increasing the system's capacity.</p> |
申请公布号 |
WO2005046073(A1) |
申请公布日期 |
2005.05.19 |
申请号 |
WO2004EP12251 |
申请日期 |
2004.11.01 |
申请人 |
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL);NILSSON, JOHAN;PALENIUS, TORGNY;LINDOFF, BENGT |
发明人 |
NILSSON, JOHAN;PALENIUS, TORGNY;LINDOFF, BENGT |
分类号 |
H04B1/707;(IPC1-7):H04B1/707 |
主分类号 |
H04B1/707 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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