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Sequential symbol synchronizers based on pulse comparison operating by positive...
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.This work presents the sequential symbol synchronizer based on pulse comparison by positive transitions at quarter rate (txp/4). Their performance is compared with a reference synchronizer by both transitions at the rate (tx). For the reference and proposed synchronizer we consider two versions which are the manual (m) and the automatic (a). The objective is to study the four synchronizers and evaluate their ou...
Prefilter bandwidth effects in data symbol phase synchronizers of open loop
Reis, A.D.; Carvalho, J.P.; Rocha, J.F.; Gameiro, A.S.This work studies the effects of the prefilter bandwidth on the open loop symbol synchronizers. We consider three different prefilter bandwidth, namely, B1=¥ ( infinite), B2=2.tx and B3=1.tx, where tx is the transmission rate. We consider also four open loop symbol synchronizers, namely, the tank (tank), the SAW (SAW), the monostable (mon), and the astable (ast). The objective is to study the prefilter bandwidt...
Prefilter bandwidth effects in sequential symbol synchronizers based on clock s...
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.This work studies the effects of the prefilter bandwidth in the sequential symbol synchronizers based on clock sampling by positive transitions. The prefilter bandwidth B is switched between three values, namely B1=∞, B2=2. tx and B3=1. tx, where tx is the bit rate. The synchronizer has two variants, one discrete and other continuous. Each variant has two versions, one manual and other automatic. The objective ...
Sequential symbol synchronizers based on pulse comparation at Half Rate
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.This work presents a synchronizer based on pulse comparation, between variable and fixed pulses. We consider four synchronizers, divided in two variants, one variant operate at the rate and the other at half rate. Each synchronizer variant has two versions which are the manual and the automatic. The objective is to study the synchronizers and evaluate the output jitter UIRMS (Unit Interval Root Mean Square) ver...
Sequential symbol synchronizers based on clock sampling by positive transitions
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.This work presents a sequential symbol synchronizer, that was discovered by us, and its functioning principle is based on the clock sampling by the input positive data transitions. This synchronizer has two topologies, namely the discrete and the continuous. Also, each topology has two versions which are the manual and the automatic. These synchronizers are very interesting, because the previous adjust of t...
Effects of the previous pulse shift and filter on the symbol synchronizer PLL
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.We will study the effects of the shift of the previous pulse temporal position (between P1 and P2) on the symbol synchronizers jitter behavior. Each pulse temporal position (P1 and P2), with the same previous filter, forms a group with four different carrier PLL (Phase Lock Loop) namely the analog, hybrid, combinational and sequential. The main objective is to study the synchronizers output jitter UIRMS (Unit I...
Carrier and symbol phase synchronizers
Reis, A.D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.In this work, we will study the carrier phase Lock Loop (CPLL) when the input carrier changes its shape. The CPLL has four prototypes which are the analog, the hybrid, the combinational and the sequential. The input carrier can be a sinusoidal wave, a triangular wave or a rectangular wave. The objective is to study the four synchronizer types and to observe their jitter behaviors as function of the input carrie...
Distributed MISO system capacity over rayleigh flat fading channels'
Castanheira, D.; Gameiro, A.S.For a Distributed Multiple Input Single Output (DMISO) system a terminal can be connected to all system antennas, but this leads, obviously, to a high processing capacity requirement, which is not practical. Since capacity increases only slightly with the terminal connection to more antennas, it is important to evaluate the number of antennas that a terminal must be connected to. Thus in this paper we study the...
Deterministic and random phase synchronizers
Reis, A.D.; Rocha, J. F.; Gameiro, A.S.; Carvalho, J.P.This work study two groups of synchronizers, namely the Deterministic Phase Synchronizer and the Random Phase Synchronizer. The difference between them is only inside of the phase comparator. In the first group, the VCO (Voltage Controlled Oscillator) synchronizes with the input deterministic phase of an expected periodic transition. In the second group the VCO synchronizes with the input random phase of an une...
Synchronous and asynchronous sequential symbol synchronizers
Reis, A. D.; Rocha, J.F.; Gameiro, A.S.; Carvalho, J.P.In this work, we present two synchronizer groups: the synchronous and the asynchronous. The synchronous group is based in forward logic with flip flops and the asynchronous group is based in forward logic with delay line feedback. In each group we consider two versions: the manual and the automatic. The main objective is to study the two groups, each one with two versions and to observe its jitter performance a...
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