By Jiangzhou Wang, Tung-Sang Ng
Provide you with in-depth wisdom of a few of the technical regimes for imposing 3rd iteration (3G) instant cellular communications structures, and covers the past due improved strategies more likely to develop into destiny criteria in 3.5G or 3GPP2. critical reference for practising pros and scholars.
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Extra info for Advances in 3G Enhanced Technologies for Wireless Communications
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. 22) where the Measured_total_E b /I 0 and Target_E b /I 0 are the measured E b /I 0 after RAKE combining and the target E b /I 0 at an MS, (k ) respectively. The P REF is constant during the length of the G slot (k ) and its value of n (= g × G )th slot P REF (n ) is updated every G (k ) (k ) slot as P REF (g × G ) = P REF (( g − 1) × G ) + ⌬P (k ).
The preamble signature is a code sequence of 256 repetitions of a signature with 16 chips. The scrambling code for the preamble part is a truncated code sequence with 4,096 chips from the beginning of the long scrambling code, which is assigned by BCH signaling. Meanwhile, the message part is first spread with dual-channel spreading using a different channelization code; then, it is spread via complex spreading using a long scrambling code with lengths of 38,400 chips. For the channelization code, orthogonal variable spreading factor code with SF = 256 and with SF = 32-256 is used for the control part in the Q channel and for the coded data part in the I channel, respectively.
10 shows that the cell search time performance in the two-cell case, which was slightly better than that in the single-cell case, was different from the laboratory results. This is explained later in the chapter. In the two-cell case in the field experiments, although the average received E b /N 0 values of SCH and CPICH over the test course from two cell sites were equal, the instantaneous received signal powers of the two-cell sites were different due to the independent shadowing variations. Therefore, the MS can search the scrambling code of the cell site with a larger receive signal power utilizing the compensation effect of the received level degradation, that is, the site diversity effect.