By Jiangzhou Wang, Tung-Sang Ng
Will give you in-depth wisdom of a few of the technical regimes for enforcing 3rd iteration (3G) instant cellular communications structures, and covers the past due more desirable options more likely to turn into destiny criteria in 3.5G or 3GPP2. crucial reference for training pros and scholars.
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Additional resources for Advances in 3G Enhanced Technologies for Wireless Communications
In the RAKE combiner, the despread signals associated with resolved paths are multiplied by the complex conjugate of their channel gain estimates and summed. Therefore, if the SIR measurement is done after RAKE combining, it is affected by the channel estimation error. Then, instead of directly measuring the SIR after RAKE combining, a more accurate SIR measurement method was proposed [17, 18], in which, first, the SIR on each resolved path is measured, and then the SIRs of all the resolved paths are summed to obtain the SIR (which is equivalent to the one at the output of the RAKE combiner).
In this way, because a scrambling code is known to node B in advance and the relationship between the preamble signature and channelization code in a message part is negotiated, node B can easily find the spreading code and received timing of a message part by detecting the preamble part. Furthermore, the transmit power of a preamble part is gradually increased from the initial value until the preamble is detected in order to decrease the amount of interference to other channels (via a process called power ramping ) .
However, it is difficult to quickly track variations in path loss including shadowing due to the movement of the MS. The method in  reduces TPC bit error by sending the same TPC bit over several slots in the site diversity mode; this prevents the transmit power difference between BSs from becoming too large. However, in addition to the problem described in , the TPC delay increases. 22 . (k ) 1. First loop: The standard transmit powers, P REF , of all BSk are compensated by ⌬P (k ) (in decibels) according to the dedicated control channel from a MS based on the average SIR measurement at an MS.
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