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that each point in the trellis representation of a rate-1/3 convolutional code has only two inputs, while a point in the trellis representation of a rate-2/3 convolutional code has four inputs. The increase in the number of inputs will signi cantly increase the complexity of the add compare select (ACS) unit. To address this issue, we use punctured codes. It can be shown that the performance difference between the optimal rate-2/3 code and the punctured code is less than 0.5 dB at a BER 1025. In the simulation results shown in next sub-section we have used the low complexity punctured code. 12.4.5 Performance Comparison In order to compare the performance of the pulsed and nonpulsed systems, we ran a complete simulation of both systems over the channel models CM3 and CM4 of the IEEE 802.15.3a. Figure 12.9 shows the results of the simulation of both the nonpulsed and pulsed-OFDM systems when operating at 106.7 Mbps over a CM-4 channel. This channel model has a delay spread of 250 ns. In this gure the BER is plotted vs distance for both systems. The BER must be less than 1025 in order

For bipolar mixers, this amplitude can be fairly small (a few times VT), but for MOS mixers it needs to be significantly larger than that (often a few times Vgt = Vgs Vt) In order to maintain the required amplitude over process, temperature, and supply, it is often desirable to hard switch the buffer s devices (Fig 45) However, with the buffer hard switched, the noise present at the tail current source will up-convert (with an up-conversion gain of 2/ ) and mix with the desired LO signal In a sense the buffer acts as an up-converter mixer to the tail current noise It is therefore quite important to maintain low noise on the bias lines Bias line noise (on the VCO or the buffers) is often one source of phase noise seen on measured response that may have been missed in simulations.

Just as with integrity protection, encryption is also applied on the air interface (up to RNC and P-CSCF, respectively) and when travelling across the GRX. However, user-plane traf c is also encrypted, not just signalling messages. Between UE and RNC, encryption is performed on the RLC or MAC layer. The IMS adds its own encryption, based on IPsec, between UE and P-CSCF. Inter-PLMN encryption also uses IPsec.

Remember to put the spec sheets and sales leaflets in Acrobat PDF format on your Web site for clients to download and print off. Check the print quality yourself when you do this. If your distribution channels don t include dealers and printed spec sheets, you can use your in-house color laser printer to run off hard copies, as required. At this stage, these items of print are the product. If you have a quality product, use quality paper; and they need to be ready for distribution well in advance of any countdown to the launch.

Review 8 to understand how modeless dialog boxes work. It s crucial to follow the design rules outlined in this chapter.

the compound being separated. That is, streaking of amines is reduced by ammonia in the eluent, and streaking of carboxylic acids is reduced by formic or acetic acid in the eluent. Normal phase TLC involves a hydrophilic stationary phase (silica gel, alumina) such that more polar solvents have greater eluting power. A series expressing the relative eluting power of a selection of solvents has been developed and is summarized graphically (Fig. 9.3). Reverse-phase TLC involves a hydrophobic stationary phase (silica covalently bonded to C4, C8 (Fig. 9.4), or C16 hydrocarbon chains) such that less polar solvents have greater eluting power. Mobile phases commonly used in reverse-phase TLC (or HPLC) include water/methanol and water/acetonitrile mixtures. The relationship between the relative eluting power of the two mixtures is not linear, but a nomograph (Fig. 9.5) can be used to relate the mobility of a compound in two different solvent systems. One problem that sometimes arises in TLC (and other absorption chromatography) is that the compound may be unstable or otherwise chemically modi ed during the elution. A simple way to test for this possibility is two-dimensional analysis. The sample is spotted in one corner of a square TLC plate. It is eluted in one direction, dried, turned 90 , and eluted again. It is then visualized. If the compounds have survived the TLC without modi cation, all spots should be found along the diagonal (Fig. 9.6). Off-diagonal spots indicate that modi cation has occurred during the elution.