Advances in UMTS Technology by J. C. Bic, E. Bonek

By J. C. Bic, E. Bonek

An in-depth evaluate of the common cellular Telecommunication process (UMTS) for telecommunications teachers, researchers, and communications specialists.

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By J. C. Bic, E. Bonek

An in-depth evaluate of the common cellular Telecommunication process (UMTS) for telecommunications teachers, researchers, and communications specialists.

Show description

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For the CEIGU input signal of the b-th antenna of the k-th user in the p-th stage, (p 2), the estimated interference replicas of all other users, , user's own channel, Σ and other multipaths of the ), which are estimated in the p vious stage, are weighted by the interference rejection weight control (IRWC) value, ap [47], and removed from the signal received. It was confirmed by the some of the authors [47] that by setting ap to less than one, the BER performance using COMSIC is improved since the influence of the generation error of the interference replica due to the channel estimation error and data decision error is mitigated.

1 Reverse link The performance of reverse link inter-cell site diversity depends on the type of reliability information that is used. Therefore, we present a two-step SC scheme using two types of reliability information [26, 27]: CRC results calculated ove selection interval TSEL and the average received SIR measured over interleavin interval TILV. , the number of TPC command bits to lower the transmit power during TILV, instead of the actual measured SIR value This is because the transfer capacity in the back haul required for the reliability information of inter-cell site diversity can be significantly decreased (note that only 4 bits/frame are required for denoting the SIR average over one frame).

As shown in Figure 6, transport channels with different bit rates and QoS levels are multiplexed and transferred into one physical channel. A transport block is a basic unit for data transfer between the MAC layer and Layer 1 (in Figure 6 of the transport channel, 1(1) represents the first block of transport channel 1). , the block error rate (BLER) or bit error rate (BER) of the physical channel is achieved by changing the transmit power or data modulation scheme according to the fading variation.

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