摘要:
A system and method for media access control are disclosed. The method comprises providing concurrent orthogonal channels to access media using pulse division multiple access to define pulse positions, wherein the pulse division multiple access includes a time hopping sequence and an offset to distinguish the concurrent orthogonal channels. In addition, the method comprises processing signals associated with at least one of the orthogonal channels.
摘要:
Die Erfindung bezieht sich auf ein Verfahren und eine Schaltung zum Bestimmen eines Wertes (x), insbesondere einer Dauer, eines Messsignals (ms), wobei - ein Zeitgeber (T) ausgestaltet ist bei einem ersten Zähltakt-Zustandswechsel eines Zähltakts (clk) ein Steuersignal (s0) an zumindest ein erstes von zumindest zwei Verzögerungsgliedern (G1, G2, G3, G4) anzulegen, - die Verzögerungsglieder (G1, G2, G3, G4) ausgestaltet sind zeitlich zueinander unterschiedlich verzögerte Vergleichssignale (s1, s2, s3, s4) zu erzeugen und - eine Komparatoranordnung mit zumindest einem Komparator (K1, K2, K3, K4) mit Komparatoreingängen zum Anlegen der unterschiedlich verzögerten Vergleichssignale (s1; s2; s3; s4) und des momentanen Messsignals (ms) ausgelegt ist aus dem jeweils anliegenden Vergleichssignal (s1; s2; s3; s4) und dem Messsignal (ms) jeweils ein Vergleichsergebnis (v1, v2, v3, v4) zu bestimmen, wobei die Abfolge der Vergleichsergebnisse (v1, v2, v3, v4) einen Differenzwert (x1) des Messsignals (ms) bildet.
摘要:
An apparatus and method for demodulating PPM signals is disclosed. The apparatus includes a slicer (218) configured to generate samples of a signal carrying information, and a demodulator (220) having a digital integrator (221) configured to accumulate the samples at two position hypothesis, the demodulator being further configured to recover from the difference of the accumulated samples (222) data representative of the information carried by the signal (224).
摘要:
Ce procédé d'identification d'une donnée Sk comprend : a) la construction (84) d'une suite chronologique {T1 ; ... ; Ti ; ...; TN} d'instants d'arrivée Ti d'impulsions ou de bloc d'impulsions successifs, b) le calcul (96) d'une valeur de ressemblance entre cette suite {T1 ; ... ; Ti ; ... ; TN} et une séquence chronologique prédéterminée {TREFk1 ; ... ; TREFkj ; ... ; TREFkM} d'instants d'arrivée codant la donnée Sk pour plusieurs décalages temporels Ol entre la suite {T1 ; ... ; Ti ; ... ; TN} et la séquence {TREFk1 ; ... ; TREFkj ; ... ; TREFkM}, c) l'identification de la donnée Sk dans la suite {T1 ; ... ; Ti ; ... ; TN} si la valeur de ressemblance calculée pour l'un des décalages temporels Ol franchit un seuil prédéterminé
摘要:
A frame format decoder (22) and training sequence generator (24) for determining the frame format of received data which is compliant with the IEEE 802.1 lb standard for wireless local area networks, and for providing a training sequence for an adaptive equalizer (16). The received signal is first despreaded, demodulated and descrambled, so that the SYNC field is reconstructed, and then a counter 32 counts the number of consecutive bits having the same polarity or logic value until N such bits are counted (where N is an integer greater than 1). The polarity or logic value of the N counted bits enables the decoder (22) to determine whether the frame format is long or short. A training sequence, being a copy of the transmitted SYNC field eventually followed by an SFD field, is also generated for use by an adaptive equalizer (16).
摘要:
A stream of modulation symbols from a zero symbol rate (ZSR) coding/modulation module and a stream of modulation symbols from another type of coding/modulation module are input into an interweaver module. The interweaver module mixes the two input streams when assigning modulation symbols to be communicated in a segment. If a ZSR modulation symbol is non-zero, the ZSR modulation symbol is allocated a transmission position. If the ZSR modulation symbol is a zero modulation symbol, the modulation symbol from the other coding/modulation module is allocated the transmission position. The non-zero modulation symbols from the ZSR module are higher in power than the non-zero modulation symbols from the other module, thus facilitating detection and recovery.