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Offering a large bandwidth under strict transmission power limits, UWB communications can overcome the spectral congestion and consequent performance impairment experienced by narrowband devices operating in common unlicensed frequency bands. The impulse radio (IR) class of UWB systems typically uses time-hopping (TH) and repetition codes. The TH scheme is intended to prevent catastrophic interference...
In this paper a composite analytical model of DS-CDMA wireless communication system considering multipath Nakagami fading along with Doppler frequency shift, tracking jitter, local oscillator frequency offset and multi-access interference (MAI) for different PN sequences is presented. The analysis presents the development of a novel approach to find the pdf (probability density function) of the signal...
In this paper, we propose base station assignment method based on minimizing the transmitter power (BSA-MTP) technique in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with constrained least mean squared (CLMS) algorithm, the desired users' signal in an arbitrary...
Antenna diversity technique improves the instantaneous and average signal to noise ratio (SNR) by combining all the diversity branches. The channel noise and fading reduce the performance of any communication system through making loss of some information of the transmitted symbol. In this paper, we mathematically represented the effect of noise and multi-path fading on the transmitted signal. Then...
The next generation broadband wireless communication offers all types of services at very low cost at any time and at any where basis using orthogonal frequency division multiplexing and Worldwide Interoperability for Microwave Access Technology. The transmitted signal is distorted by channel noise and interference from other sources causing bit error. Diversity is a technology to reduce both the...
Wireless links are impaired by random fluctuations in signal level across space, time and frequency known as fading. Spatial diversity is an attractive solution to improve system capacity as well as system performance by providing array gain or increased SNR. Satellites (GEO,MEO) and High Altitude platform stations(HAPS) also exploit spatial diversity in LOS/NLOS envirornment. Exact nature of the...
In cellular wireless communication systems, there have been various receiver-based techniques for performance improvement. However, it may be desirable to use transmitter- based techniques to improve the down-link capacity, since the implementation complexity is less critical at a base station (BS) than at a mobile station (MS). This paper presents a transmitter- based processing for the down-link...
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