منابع مشابه
The NOMACand Rake Systems
• In the 1950s, Lincoln Laboratory developed the spread-spectrum Noise Modulation and Correlation (NOMAC) system for improved high-frequency radio communications. The production version of NOMAC, named the F9C, generated a pseudonoise (PN) sequence at the receiving terminal in synchronism with the PN modulation of the transmitted signal. The F9C achieved as much as 17 dB of jamming protection. ...
متن کاملPerformance Analysis of Beam-Former Rake receiver and Adaptive Rake receiver for WCDMA
Direct-sequence code-division multiple-access (DSCDMA) cellular systems, such as Wideband CDMA (WCDMA), are limited in performance by interference. Several types of Rake Receivers like A-Rake, S-Rake, P-Rake, Adaptive frequency Rake, Time frequency Rake, Conventional MMSE Rake and Adaptive MMSE rake are used for WCDMA. A Beam formerRake receiver can be an effective solution to provide the recei...
متن کاملPerformance Evaluation of Rake and Pre-Rake Receiver for a Wireless DS- CDMA System
A new method to deal with multi path fading environment for DS–CDMA wireless networks has been proposed. Here, depending upon the statistical nature of the channel, signal is transmitted as a sum of various spreaded signals; each one delayed and scaled according to the delay & strengths of the multi paths of the transmitted channel. New method known as Pre-Raking is performed at the transmitted...
متن کاملAdaptive space-frequency RAKE receivers for WCDMA
Adaptive space-frequency rake receivers use maximum ratio combining and multi-user interference suppression to obtain a considerable increase in performance in DS-CDMA systems such as WCDMA. To this end, the signal-plus-interference-and-noise and the interference-plus-noise space-time covariance matrices are estimated. The computational complexity is reduced significantly by transforming the co...
متن کاملStepping on a Rake: Replication and Diagnosis
This paper replicates Sims (2011) “stepping on a rake” model. It derives the model, shows how to solve it, offers some extensions, and boils the paper down to its central ingredient. Sims’ article is important: it is a simple modern economic model that produces a temporary decline in inflation when the central bank persistently raises interest rates. Inflation then rises. The model’s essential ...
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ژورنال
عنوان ژورنال: Aikuiskasvatus
سال: 2016
ISSN: 2490-0427,0358-6197
DOI: 10.33336/aik.88474