the mobile communications handbook

... Optical Through -the- Air Communications Handbook -David A. Johnson, PE Page 22 of 68 onto the detector. The stray light competes with the modulated light from the distant transmitter. If the environmental ... glass tile mirrors together makes it. A sturdy cardboard box will help position the mirrors. One mirror is positioned at the bottom of the box and the other...

Ngày tải lên: 04/07/2014, 06:59

... θ (1.6) where v is the velocity of the mobile, λ is the signal wavelength, and θ is the spatial angle between the direction of motion of the mobile and the direction of arrival of the wave. 1.2.2.1.3 ... versions of the transmitted signal result from the multiple paths present in the channel or from the rapid dynamic changes of the channel. In this case, the spe...

Ngày tải lên: 04/07/2014, 08:31

... represent the information. On the other end of the link, the receiving antenna and receiver detect these amplitude, phase, or frequency variations of the wave and convert them into a form that the ... irrelevant to the system design. At the receiver, the receiving antenna is immersed in the EM field created by the trans- mitting antenna. The receiving antenna converts...

Ngày tải lên: 03/06/2014, 00:52

... resulting from the time-variance of the mobile radio channel has been introduced which exploits the fact that the transmitted symbols are one-dimensional. 4 EURASIP Journal on Wireless Communications ... obtain essentially the same performance with the adaptive RLS scheme as with the analytical MMSE solution for filter P i [μ]. This is due to the fact that the excess erro...

Ngày tải lên: 22/06/2014, 06:20

... resulting from the time-variance of the mobile radio channel has been introduced which exploits the fact that the transmitted symbols are one-dimensional. 4 EURASIP Journal on Wireless Communications ... be avoided. The GI contains a cyclic extension of the trans- mit sequence such that the convolution of the discrete-time channel impulse response and the transmit sequen...

Ngày tải lên: 22/06/2014, 19:20

... N OW DO THE REST OF THE FLASHES . Use the same technique to shake the camera during the rest of the flashes. The flashes have different intensities, so not all the shakes need to be the same. Also, ... for your text, and then click and hold on the Text tool in the tool palette to pop-out a submenu of other text tools. Select the Type Mask tool, the second tool in th...

Ngày tải lên: 28/08/2012, 08:55

... the main concepts related to mobile cellular communication systems. It then discusses the importance of multiple access protocols and the impact of the emergence of the Internet on cellular communications. ... CDMA/TDMA, on the other hand, the relevant resource is a single time-slot, as long as the time-slots are operated independently from each other, which is the case w...

Ngày tải lên: 02/03/2013, 16:59

... for the signal is given by ␵ = v ␭ cos ␪ = f D cos ␪ (2.29) where ␭ is the wavelength and f D is the maximum Doppler shift. Defining the power spectrum density as D H ( ␨ ), the power of the ... the ith information symbol at the kth subcarrier, and f (t)is the pulse waveform of the symbol. When the rectangular pulse waveform is used, f (t) is given by Multicarrier Techni...

Ngày tải lên: 26/04/2013, 09:50

... with the cus- tomer, clarify the purpose of the meeting, set the focus on the cus- tomer, and bridge to needs. Where you are in the sales cycle deter- mines the emphasis on each. But even in the ... To maintain the momentum, ask for the busi- ness or end the call with a concrete next step in place. Get into the habit of asking for an action at the end of each call. “...

Ngày tải lên: 21/07/2013, 09:48

... perspective of the protocol, the MS is not only a peer of the BTS but communicates directly with the MSC and the VLR, via the mobility management (MM) and call control (CC). Furthermore, the MS has ... equipment and the related database. In other words, the subscriber to a GSM system is not determined by the identity of the mobile equipment but by the SIM, which alwa...

Ngày tải lên: 19/10/2013, 03:20