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In UMTS Rel 99, the system capacity of high bit rate packet data users mixed with regular voice users will be limited by the number of orthogonal codes. [T/F] The outerloop power control is done at the Node-B of UMTS systems. [T/F] In UMTS, one way to increase the physical bit rate is to assign multiple codes to the same user. [T/F] In UMTS Rel-99, the RNC is responsible for dynamically controlling the physical resources allocated to the data bearer. [T/F] In UMTS Rel-99, downlink channels of different data rates are not orthogonal in at fading channels because of the different spreading factors used to spread the downlink channels. [T/F] In the uplink of UMTS mobiles, channels from the same mobiles are spread using orthogonal channelization codes. [T/F] In HSDPA, there is one high speed shared channels setup to be shared dynamically among all voice users. [T/F] A UMTS mobile is in soft handoff with 2 Node Bs (1 and 2). The gure below illustrates the traces of received signal power (Eb/Io) as well as the power control bits transmitted to the UMTS mobile versus time at the 2 BTSs involved in the soft handoff process. Explain why the received power at Node-B (1) is dropping despite the Node-B (1) consistently transmit power control bit of 1 to the mobile. [T/F]
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In s 1 6, we focused on the point-to-point and multiuser adaptation design for MIMO channels utilizing either the full or limited CSIT. Narrowband transmission and at fading MIMO channels are assumed in these chapters. However, in practice, as the transmission bandwidth increases, it is increasingly possible to experience frequency-selective fading. Hence, it is the focus of this chapter to extend the discussion on the design of cross-layer jointly adaptive physical layer and MAC layer to cover wideband MIMO transmissions. Recall from 1 that the number of resolvable multipaths as experienced by the transmitted signal is given by Lp = Wtx/Bc , where Wtx is the signal transmission bandwidth and Bc is the channel coherence bandwidth. Hence, when Wtx > Bc, the receiver will get a number of echos at distinct delay posi> tions from a single signal transmission. These echos at different delay positions will cause intersymbol interference (ISI) and result in an irreducible error oor in the BER vSNR curves. To combat the effect of ISI, equalization is needed at the receiver, and the optimal equalization algorithm is shown to have a complexity [114] in exponential of the number of resolvable multipaths Lp. Hence, unless the number of paths Lp is small, the complexity of the optimal equalization is usually beyond implementation limitations. In practical systems such as 802.11a/b/g (WiFi), 802.16 (WiMax), and B3G systems, the transmission bandwidth is about 20 MHz. Hence, there are quite a lot of resolvable multipaths Lp for these systems, especially when they operate in outdoor environments, and we cannot rely on the receiver to perform equalization
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Channel-Adaptive Technologies and Cross-Layer Designs for Wireless Systems with Multiple Antennas: Theory and Applications. By V. K. N. Lau and Y.-K. R. Kwok ISBN 0-471-64865-5 2006 by John Wiley & Sons, Inc.
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alone. Speci cally, we need to introduce some special structures in the transmitted signal so as to simplify the task of equalization at the receiver for wideband transmissions. Two popular technologies are used to tackle the frequency-selective fading channels in wideband transmissions: direct-sequence code-division multiple access (DS-CDMA) and orthogonal frequency-division multiplexing (OFDM). DS-CDMA is a radio access technology that employs signature codes to partition the system resource into code channels. In other words, all the K user signals share the entire bandwidth and the entire time duration but differentiate among themselves with respect to different code channels.This extra code dimension is introduced through the spreading process. At the receiver, to recover the original information symbol, the receiver has to apply the same code sequence (synchronized in time) and perform the despreading process. As a result, the DS-CDMA system has a unique feature, namely, the interference suppression capability. On average,1 a DS-CDMA system can suppress the interference power by a factor called the processing gain PG, which is de ned as PG = Tb Tc (10.1)
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where Tb is the information bit duration and Tc is the chip duration. With respect to the frequency-selective fading and the effect of ISI, DS-CDMA systems can effectively suppress the ISI by PG times, and therefore, using a simple RAKE nger structure at the receiver, the equalization can be done in linear complexity with respect to Lp. Hence, DS-CDMA is the primary technology chosen for 3G cellular systems because of its robustness and lowcomplexity implementation with respect to frequency-selective fading channels. On the other hand, OFDM technique splits the information data into parallel streams over a large number of subcarriers. The subcarriers are spaced apart at precise frequencies such that the modulated data remain orthogonal. Unlike traditional frequency-division multiplexing in which the subcarriers are completely separated in frequency domain, subcarriers in OFDM system overlap. However, with appropriate processing at the receiver, the modulated data on these subcarriers appear to be orthogonal to each other. Hence, the Wtx transmission bandwidth in each subcarrier is given by f s = , where nf is the nf number of subcarriers. Since fs is much smaller than the transmission bandwidth Wtx, at fading will be experienced by each subcarrier and there is no need for ISI equalization at the receiver if suf cient guard period is inserted
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