By J. C. Bic, E. Bonek
An in-depth assessment of the common cellular Telecommunication procedure (UMTS) for telecommunications lecturers, researchers, and communications specialists.
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Additional resources for Advances in UMTS Technology
However, the average received signal energy per bit-tointerference and background noise spectrum density (Eb/Io), thus, the received signal power, is an almost constant value during one radio frame interval. Therefore, in order to bundle various transport channels with different QoSs into one physical channel, the required QoSs of various transport channels are simultaneously satisfied with respect to the identical average received signal power by changing the number of coded bits of each transport channel after channel decoding (this process is called rate matching).
The resultant signal must be the same as that of th ideal case. Therefore, we obtain The weights provided by Equation (23) cannot be directly used to form the transmit beam because the signal weighted at the baseband stage suffers phase/amplitude shift due to the RF transmit circuitry before transmission from an antenna. Let x(i)TX be the transfer function of the RF transmit circuitry for the i-th antenna branch. The signal to be transmitted from the i-th antenna is first weighted using transmit antenna weight w(i)T and then suffers phase/amplitude shift (equivalent by multiplication of x(i)TX).
Therefore, the outer loop controls the targe SIR with a more gradual updating interval compared to the inner loop so that the measured BLER or BER is equal to the target value. In general, a BLER-based outer 30 Improvements in W-CDMA loop is used. BLER is measured by calculating the number of CRC results that coincide with the value attached to every transport block. , with the required BER of 10 , it takes a much longer time to calculate the BLER. As a result, outer loop control cannot track changes in the propagation conditions.
Advances in UMTS Technology by J. C. Bic, E. Bonek