By Giovanni Cherubini (auth.), Professor Marco Luise, Professor Silvano Pupolin (eds.)
Broadband instant entry is a hugely tough and speedy altering quarter of multimedia radio communications. those papers at the topic are the court cases of the ninth Tyrrhenian Workshop, held in Lerici, Italy, September 1997. they supply a prospect at the state-of-the-art and destiny improvement, with a sufficiently vast concentration to hide technological, architectural and regulatory concerns. Emphasis is given to these advances of electronic sign processing innovations, microwave mono lithic built-in circuits and shrewdpermanent antennae that would enable the layout of within your budget person terminals with complicated functions. particular cognizance is additionally dedicated to the protocols those new terminals will use to entry the radio medium, and to the type of prone that may ultimately be supplied to the end-user sooner or later. With contributions from around the globe specialists, the fabric awarded here's a well timed and high-level review of the sphere, and in addition to being informative is an invaluable software for selling extra research into the world of multimedia radio communications.
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Extra resources for Broadband Wireless Communications: Transmission, Access and Services
0). Furthermore, for La S 64 the V&V operation is plagued by outliers at any SNR. 42 10-1 ! sEI. 5 20 Il lO EIN" dB Figure 4. Normalized frequency variance versus Es I No for V&V-SEL. 10'! r----: 1'6-OAN 1 " 1 lO']. VAV I L--..... 5 JO EIN.. dB Figure 5. Normalized frequency variance versus Es I No for V&V. This fact is apparent from Fig. 6 which shows the results of 50000 frequency measurements for Es I No::: 22 dB and v =O. We see that, although most outcomes are close to zero (as they should be).
Carrier phase (J and frequency offset v can be estimated from signal samples taken at symbol rate. NDA carrier recovery for PSK is performed as follows. First, the samples from the matched filter are fed to a Viterbi&Viterbi-like nonlinearity  to wipe out the M. Luise et al. ), Broadband Wireless Communications © Springer-Verlag London Limited 1998 35 modulation. In this way a noisy sinewave is generated whose frequency and phase are multiples of v and 8, respectively. Next, frequency and phase of the sinewave are estimated using known methods available in the literature.
As noted earlier. a considerable simplification is obtained by skipping the frequency calculation in the second-pass of the TP algorithm. In fact the frequency estimates with TP are as good as those with V&V-SEL and. therefore. the frequency recalculation is not necessary. Only the phase needs to be estimated in the second pass. Simulations indicate that no SER degradations are incurred in this way. 6. Conclusions We have proposed new non-data-aided carrier recovery schemes for 16-QAM modulation.