A power line communication method for realizing data communication between at least one first or sending power line communication partner device and at least one second or receiving power line communication partner device. The method checks transmission conditions of a plurality of possible communication channels, thereby generating transmission condition data descriptive for the communication conditions of the respective possible communication channels. Additionally, communication conditions of the plurality of possible communication channels are selected as actual communication conditions based on the transmission condition data.

Power Line Communication Methods and Devices

A method and apparatus of providing packet data services that includes establishing an over-the-air communication connection between a mobile station and a wireless network infrastructure. The mobile station communicates a version and capability indication of a wireless packet data standard supported in the mobile station to the wireless network infrastructure. The wireless network infrastructure communicates a version and capability indication of the wireless packet data standard supported in the network infrastructure to the mobile station. Operation of the mobile station and wireless network infrastructure are adjusted in accordance with the indicated versions and capabilities.

Packet data services using version and capability information

The present invention relates to systems and methods that remove echo from a signal via a novel echo cancellation technique that supports arbitrary playback sampling rates. The novel echo cancellation technique transforms a playback signal to a frequency domain representation and converts its sampling rate to a sampling rate of a frequency domain transformed received signal for the appropriate number of frequency bins. This conversion is achieved via an exact or interpolated approached. The re-sampled playback signal transform is then utilized in connection with the received signal transform to remove echo associated with the playback signal from the received signal.

Systems and methods for echo cancellation with arbitrary playback sampling rates

A power line communication method is provided for realizing data communication between at least one first or sending power line communication partner device (P1) and at least one second or receiving power line communication partner device (P10). The inventive method comprises a step of checking transmission conditions of a plurality of possible communication channels (Ch1, . . . , Chn). Thereby generating transmission condition data which are descriptive for the communication conditions of the respective possible communication channels (Ch1, . . . , Chn). Additionally, a step of selecting communication conditions of the plurality of possible communication channels (Ch1, . . . , Chn) as actual communication conditions based on said transmission condition data.

Dynamic FD coexistence method for PLC systems

In modern iterative coding systems such as LDPC decoder and turbo-convolutional decoder in which the invention may be used, the core computations can often be reduced to a sequence of additions and subtractions alternating between logarithm and linear domains A computationally efficient and robust approximation method for log and exp functions is described which involves using a simple bit mapping between fixed point fractional data format and floating point format. The method avoids costly lookup tables and complex computations and further reduces the core processing to a sequence of additions and subtractions using alternating fixed point and floating point processing units. The method is well suited for use in highly optimized hardware implementations which can take advantage of modern advances in standard floating point arithmetic circuit design as well as for software implementation on a wide class of processors equipped with FPU where the invention avoids the need for a typical multi-cycle series of log/exp instructions and especially on a SIMD FPU-equipped processors where log/exp functions are typically scalar.

Efficient check node message transform approximation for LDPC decoder

The present invention is directed to methods and systems for estimating the log base-2 of a fixed point binary number using a single polynomial for an entire possible range of input numbers. An estimation of the log base-2 of a fixed-point binary number in either hardware or software may be implemented using a minimal number of parameters. In particular, a single 2 nd order or greater polynomial may be sufficient to cover an entire range of input values for any arbitrary input word precision. The present invention provides a method and system for estimating a logarithm of a number where a linear approximation of a fractional part is determined and the linear approximation is implemented in a single polynomial function for estimating the fractional part for a range of input values. A circuit for generating an integer part and an estimate of a fractional part of a logarithm may include a shift register for loading a valid input data and for generating an estimate of a fractional part and a counter for loading a total number of bits in an input data and for generating an integer part, wherein the circuit implements a single polynomial for generating an improved estimate of the fractional part.

Method and system for estimating a base-2 logarithm of a number

The present invention is directed to methods and systems for determining maximum power backoff for modems operating according to G.SHDSL and other standards using frequency domain geometric signal to noise ratio (SNR). In one example, a G.SHDSL standard may specify a minimum power back off (PBO) that may be required for modem implementation. Although the standard specifies the minimum back off, it is desirable to be able to increase the POB beyond this level. The reasons for this may include reduced power consumption and reduced crosstalk generated by a modem. The present invention discloses a method and system for determining an absolute maximum power PBO that may be tolerated and still meet bit error rate (BER) and/or other requirements. The present invention implements a geometric mean to compute SNR in a frequency domain over a pass-band of a transmit spectrum.

Power backoff method and system for g.shdsl modem using frequency domain geometric signal to noise ratio

L'invention concerne des procedes et des systemes permettant de determiner la reduction de puissance maximale pour les modems fonctionnant selon la norme G.SHDSL et selon d'autres normes utilisant le rapport signal/bruit (SNR) geometrique en domaine frequentiel. Dans un exemple particulier, la reduction de puissance minimale (PBO) necessaire a la mise en service du modem peut etre specifiee dans la norme G.SHDSL. Bien que la norme indique une reduction de puissance minimale il est preferable d'augmenter la reduction de puissance au-dela de ce niveau, afin de permettre notamment une reduction de la consommation d'energie et de diminuer les interferences generes par le modem. L'invention concerne un procede et un systeme permettant de determiner un maximum absolu de reduction de puissance pouvant etre toleree tout en respectant le taux d'erreurs sur les bits (TEB) et ou d'autres exigences. Cette invention comprend l'utilisation de moyens geometriques permettant de calculer le rapport signal bruit (SNR) dans le domaine frequentiel dans la bande passante du spectre de transmission.

Eric Tsing-Ho Leung

Papers

Method and system for estimating a base-2 logarithm of a number

Power backoff method and system for g.shdsl modem using frequency domain geometric signal to noise ratio

Procede et systeme permettant de determiner la reduction de puissance maximale a partir du rapport signal/bruit geometrique en domaine frequentiel