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Ultra-Wideband Communications Systems: Multiband OFDM by W. Pam Siriwongpairat;K. J. Ray Liu

By W. Pam Siriwongpairat;K. J. Ray Liu

The one booklet that offers complete assurance of UWB multiband OFDM technologyUltra-wideband (UWB) has emerged as a expertise that provides nice promise to fulfill the transforming into call for for reasonably cheap, high-speed electronic networks. the large bandwidth to be had, the opportunity of excessive facts charges, and the promise for small measurement and coffee processing strength with lowered implementation rate all current a special chance for UWB to develop into a greatly followed radio resolution for destiny instant domestic networking technology.Ultra-Wideband Communications structures is the 1st e-book to supply finished assurance of the basic and complicated matters relating to UWB know-how, with a selected specialise in multiband orthogonal frequency department multiplexing (multiband OFDM). The multiband OFDM process was once a number one technique within the IEEE 802.15.3astandard and has lately been standardized by means of ECMA overseas. The booklet additionally explores numerous significant complex cutting-edge applied sciences to augment the functionality of the standardized multiband OFDM method. extra insurance includes:*Characteristics of UWB channels*An evaluation of UWB single-band and multiband OFDM approaches*MIMO multiband OFDM*Performance characterization*Performance lower than sensible considerations*Differential multiband OFDM*Power-controlled channel allocation*Cooperative UWB multiband OFDMComplete with guidelines for destiny study possibilities to reinforce the functionality of UWB multiband OFDM expertise over present and destiny instant networks, this is often an vital source for graduate scholars, engineers, and educational and commercial researchers concerned with UWB.

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Extra resources for Ultra-Wideband Communications Systems: Multiband OFDM Approach (Wiley Series in Telecommunications & Signal Processing)

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Specifically, an M-ary PAM signal comprises a sequence of modulated pulses with M different amplitude levels. 3) k=−∞ where am (k) is the amplitude of the kth pulse, which depends on the M-ary information symbol m ∈ {0, 1, . , M − 1}. 2 shows a 4-ary PAM signal. A PAM signal is simple to generate; however, it is vulnerable to channel noise, which can change the pulse amplitude and cause false detection. Moreover, since the pulse transmitted is periodic, it produces discrete lines on the power spectral density of a PAM signal.

Ray Liu Copyright c 2008 John Wiley & Sons, Inc. 19 20 UWB: SINGLE-BAND APPROACHES interest recently [Yan02, Kum02, Wei03, Sir04, Sir05a]. By the use of space–time coding [Gue99, Tar98, Ala98], MIMO systems exploit both spatial and temporal diversities, and hence promise to improve system performance significantly. In this chapter we present a general space–time-coded UWB system and provide performance analysis under a Nakagami-m frequency-selective fading environment. 1, we introduce a single-band UWB signal, also known as impulse radio.

17) n c =0 The output of the correlator is given by (1) yk = ∞ −∞ (1) vk (t)r (t) dt. 18) Consider an AWGN channel in the absence of multiuser interference. , r(t) = x(1) (t) + n(t)]. 19) ∞ where ρ = 0 for BPSK modulation and ρ = −∞ w(t − Td )w(t)ds for BPPM modulation. 19), nk is the sample noise, which is a zero-mean Gaussian random variable with variance N 0 /2. 19), the maximum likelihood decision rule is given by (1) dˆ (k ) = (1) 1 if˜yk ≥ 0; −1 otherwise. 20) Clearly, the correlation receiver is optimal in an AWGN channel.

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