By Yong Soo Cho, Jaekwon Kim, Won Young Yang, Chung G. Kang
ISBN-10: 0470825618
ISBN-13: 9780470825617
MIMO-OFDM is a key know-how for next-generation mobile communications (3GPP-LTE, cellular WiMAX, IMT-Advanced) in addition to instant LAN (IEEE 802.11a, IEEE 802.11n), instant PAN (MB-OFDM), and broadcasting (DAB, DVB, DMB). In MIMO-OFDM instant Communications with MATLAB, the authors supply a complete advent to the speculation and perform of instant channel modeling, OFDM, and MIMO, utilizing MATLAB courses to simulate a few of the options on MIMO-OFDM platforms.
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Sample text
In the wireless digital communication systems, however, the degree of time variation in the signal strength is relative to the symbol duration. In other words, the channel condition can be considered static when the degree of time variation is relatively small with respect to the symbol duration. This particular situation is referred to as a quasi-static channel condition. In fact, the indoor channels are usually modeled under the assumption that they have either static or quasi-static channel conditions.
Therefore, we qffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi conclude that the amplitude of the received signal, ~yðtÞ ¼ h2I ðtÞ þ h2Q ðtÞ, over the multipath channel subject to numerous scattering components, follows the Rayleigh distribution. The power spectrum density (PSD) of the fading process is found by the Fourier transform of the autocorrelation function of ~yðtÞand is given by [12] 8 Wp 1 > > vffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi > > 0 12ffi jf Àfc j fm u > 4pf mu < u @f Àfc A S~y~y ðf Þ ¼ t1À > > fm > > > : 0 otherwise ð1:41Þ P where Wp ¼ Efh2I ðtÞg þ Efh2Q ðtÞg ¼ Ii¼1 Ci2 .
7 -2 -1 0 1 Phase [rad] 2 3 4 (c) Distribution of phase Generation of a time-varying channel with Clarke/Gans model. 13 (“Doppler_spectrum”) to generate the FWGN model and Doppler spectrum, respectively.
MIMO-OFDM Wireless Communications with MATLAB by Yong Soo Cho, Jaekwon Kim, Won Young Yang, Chung G. Kang
by James
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