نتایج جستجو برای: frequency division multiple access
تعداد نتایج: 1558997 فیلتر نتایج به سال:
Long Term Evolution (LTE) is consents pliable spectrum distribution which renders enriched wireless data services to users at lower latency and multi-megabit throughput. LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (Sc-FDMA) for downlink and Uplink transmission where OFDMA has been acquired in LTE for downlink transmission ...
Code Division Multiple Access (CDMA) is probably the most interesting multiple access method provided by spread spectrum technology. CDMA refers to a multiple access method in which the individual terminals use spreadspectrum techniques and occupy the entire spectrum whenever they transmit. This paper focuses on direct-sequence spread-spectrum principles (processing gain, spreading, de-spreadin...
در [time domain multiple access/code division multiple access] نشان داده شده که مسأله اختصاص بهینه منابع رادیویی در لینک فروسوی شبکه بی سیم tdma/cdma 1، نوعی مسأله mmkp 2 از نوع np-hard است. در این مقاله الگوریتم شهودی جدیدی برای حل این مسأله با پیچیدگی محاسباتی چندجمله ای ارائه شده است. مطالعات عددی انجام شده، نشان دهنده کاهش بسیار زیاد پیچیدگی محاسباتی است.
Vehicle-to-vehicle radio links suffer from power variations, multipath fading and associated Doppler spreading in frequency, as well as interference form other vehicles. These effects are investigated in the context of an Automated Vehicle Control Systems (AVCS) employing vehicle platoons. A statistical model for the channel is considered and the performance of the network involving many links ...
چکیده ندارد.
power amplifiers (pas) are inherently nonlinear elements and digital predistortion is a highly cost-effective approach to linearize them. although most existing architectures assume that the pa has a memoryless nonlinearity, memory effects of the pas in many applications ,such as wideband code-division multiple access (wcdma) or orthogonal frequency-division multiplexing (ofdm), can no longer b...
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