e economic effort in the area) was below 30 seconds on a 2 GHz PC. initial deployment of new digital broadcasting networks). Hence new deployment strategies must be investigated. A formulation of path loss VS. distance for urban microcells In particular this work shows the possibility of strongly into simple empirical statistical models is reported in improving coverage probability in urban environment by [ZVRK04]. On the base of a 5.3 GHz MIMO measurement adding some urban and suburban gap filler to conventional campaign carried out in central Helsinki with the BS lo- DVB network deployment. This is possible exploiting the cated in the middle of street crossings at a height of about flexibility of the single frequency, OFDM transmission 10 m, two path-loss formulas were derived by measure- technique. Results show that, with a conventional plan- ment fitting using the least-square method for both LoS and ning adopting extra-urban transmitters only, the mini- NLoS situations. The BS was equipped with a uniform mum power at the TX stations should reach up to 95 kW linear array of four dual polarised elements. Measurements to achieve a coverage probability PC 0.95 all over a cir- from the MT were performed over rectilinear routes and cular urban area with a radius of 5 kilometres. By adopting fast fading was averaged out from measurements using a new, more diffused coverage solution composed of 24 a sliding window of about 80%, and thereafter the powers urban TXs (irradiating 8 W each), 10 suburban TXs (30 over the MIMO subchannels were averaged in each MT W) and 3 extra-urban TXs (5.845 kW) the same coverage location. The LoS formula is a simple Hata-like formula: probability can be obtained saving nearly 90% of the total PL(d1) = 40.3 + 23.4 Log(d1)[dB]; Transmitter (TX) power. The resulting coverage map is shown in Figure 4.7-27. Los = 2.6[dB] where di is LoS distance and LoS is the Path Loss (PL) standard deviation. It is interesting to note that the PL 4.7.4 Channel measurements and exponent (=2.3) is greater t