Abstract: Apparatus, and an associated method, for facilitating communication of a data block communicated in an OFDM-based, communication system. Side-information required to be transmitted by many PAPR reduction schemes in OFDM is carried and transmitted by sending orthogonal binary sequences superimposed on the OFDM data sequence carrying the information to be transmitted. In one embodiment, a selected scrambling sequence is multiplied with an input data block to yield a desired Peak-To-Average Power Ratio. An identification sequence one-to-one corresponding to the scrambling sequence is superimposed on the resultant sequence and transmitted together. In the receiving station, the identification sequence is determined through correlation operations. This also determines the scrambling sequence. The effects of both sequences are finally removed from the information-carrying data sequence.

Abstract: A system and method for detecting both the forward and reverse power of a power amplifier are provided. The power amplifier is a quadrature power amplifier including an in-phase amplifier circuit and a quadrature-phase amplifier circuit. A radio frequency (RF) input signal is split and phase-shifted to provide an in-phase RF input to the in-phase amplifier circuitry and a quadrature-phase RF input to the quadrature-phase amplifier circuitry, where the quadrature-phase RF input is +90 degrees out-of-phase with the in-phase RF input. In one embodiment, a power detection system operates to downconvert quadrature output signals from the in-phase and quadrature-phase amplifier circuits based on quadrature local oscillator signals.

Abstract: The present invention is related to a digital circuit for use in a mixed-signal circuit.

Abstract: A method of equalizing a received signal compensates for frequency selectivity of the communication channel taking into account channel estimation errors. The method comprises generating channel estimates for the received signal, computing filter weights for an equalizer based on said channel estimates and a covariance of the channel estimation error, and filtering the received signal using the computed filter weights.

Abstract: A printer apparatus generates a fixed-length packet by appending a termination identifier for representing a termination point of sub-data. The printer apparatus transmits the packet to a unit. Upon receiving the packet, the unit detects burst error based upon the termination identifier.

Abstract: A method is provided for performing a MAP probability decoding of a sequence R(n) including N bits of encoded data. The method includes the steps of: (a) generating a sequence rn of sot-values by processing the sequence R(n); (b) performing a forward recursion by computing alpha values ?S,SG utilizing the soft-decision values; (c) performing a backward recursion by computing beta values ?S,SG utilizing the soft-decision values; and (d) performing an extrinsic computation by computing probability values p?k. The alpha values ?S,SG are relative log-likelihoods of an encoding process arriving at various states. The beta values ?S,SG are relative log-likelihoods of the encoding process arriving at various states. The probability values p?k represent a set of probabilities indicating that each data bit of an input sequence dK had a value equal to zero or one. The sequence R(n) represents an encoded form of the input sequence dK.

Abstract: An nth root transformation is used for generating near Gaussian metrics from non-Gaussian metrics for input into a conventional turbo decoder that is based on the assumption that the input sequence to the decoder has a Gaussian distribution. The nth root transformation transforms channel non-Gaussian statistics to near Gaussian statistics for use with conventional turbo decoding for improved noncoherent communications over a non-Gaussian channel, such as a fading channel. For a differential coherent PSK waveform, where the channel statistics of a demodulator are non-Gaussian, for example, in the presence of fading, the nth root transformation is used to transform the non-Gaussian statistics to near Gaussian statistics for generating near Gaussian metrics, for improved PSK communications.