Abstract: Fast fading in cellular systems causes time variation of the Channel Impulse Response (CIR) resulting in significant performance degradation that is reduced by adding a pulse train to the transmitted data symbols and estimating the CIR by averaging the symbols as they vary from one OFDM symbol to another within the physical data frame (or packet).

Abstract: Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also ensuring that soft bit computation is performed for substantially all bits. The method involves computing a first set of soft bits from bits transmitted in a received signal, using a reduced-state trellis with finite non-zero delay, calculating hard decisions in response to the received signal, and also ensuring that substantially all soft bits are computed by employing zero-delay soft decision-making or decision-feedback equalization to compute a second set of soft bits. Furthermore, the hard decisions are used to compute the second set.

Abstract: Apparatus, and an associated method, for estimating frequency offset introduced upon symbols of a sequence communicated by a sending station to a data destination during operation of a communication system. A received sequence is rotated by multiplying the symbols thereof by offset values selected from a set of offset values. Then, for each rotated sequence, an estimation of a data sequence is made. Noise indicia associated with each estimated data sequence is calculated. And, comparisons are made of the noise indicia associated with each of the estimated data sequences. Responsive to the comparisons, selection is made of the frequency offset that has been introduced upon the data sequence.

Abstract: Apparatus, and an associated method, for estimating frequency offset introduced upon symbols of a sequence communicated by a sending station to a data destination during operation of a communication system. A received sequence is rotated by multiplying the symbols thereof by offset values selected from a set of offset values. Then, for each rotated sequence, an estimation of a data sequence is made. Noise indicia associated with each estimated data sequence is calculated. And, comparisons are made of the noise indicia associated with each of the estimated data sequences. Responsive to the comparisons, selection is made of the frequency offset that has been introduced upon the data sequence.

Abstract: Apparatus, and an associated method, for facilitating recovery of digital data communicated to a receiving station upon a non-ideal channel. Sequences of the data are applied to a reliability indicia generator having a trellis of low-complexity. The reliability indicia generator generates reliability information which is provided to a soft trellis decoder. The soft trellis decoder includes a dynamically-formed trellis of trellis sizes dependent upon the reliability information provided by thereliability indicia generator. When the reliability indicia generator indicates certain nodes of the trellis used to perform MLSE operations to be reliable, such nodes are removed out of the trellis. The MLSE operations performed at the soft trellis are thereby of reduced complexity levels.

Abstract: Apparatus, and an associated method, for facilitating recovery of digital data communicated to a receiving station upon a non-ideal channel. Sequences of the data are applied to a reliability indicia generator having a trellis of low-complexity. The reliability indicia generator generates reliability information which is provided to a soft trellis decoder. The soft trellis decoder includes a dynamically-formed trellis of trellis sizes dependent upon the reliability information provided by thereliability indicia generator. When the reliability indicia generator indicates certain nodes of the trellis used to perform MLSE operations to be reliable, such nodes are removed out of the trellis. The MLSE operations performed at the soft trellis are thereby of reduced complexity levels.

Abstract: Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also ensuring that soft bit computation is performed for substantially all bits. The method involves computing a first set of soft bits from bits transmitted in a received signal, using a reduced-state trellis with finite non-zero delay, calculating hard decisions in response to the received signal, and also ensuring that substantially all soft bits are computed by employing zero-delay soft decision-making or decision-feedback equalization to compute a second set of soft bits. Furthermore, the hard decisions are used to compute the second set.

Abstract: A method and an apparatus for detecting data symbols of a multiple-phase-shift-keying (MPSK) modulated slot used for radio reception of digital data are disclosed. The method and apparatus simultaneously accomplish signal equalization and symbol detection. A simplified algorithm is used which is sub-optimal but closely approximates an optimal solution which significantly reduces computational load. A solution vector is constructed and data symbol values in the solution vector are perturbated. After each perturbation, a solution error is computed to determine whether the perturbated value provides a better solution. Perturbation continues until an optimal solution is found or a maximum number of iterations have been performed. The advantage is an improved, cost-effective radio receiver which enables faster wireless data transfer.

Abstract: A system and method is provided for performing Turbo Equalization upon a communication system, comprising the usage of nonlinear analog circuitry such as Cellular Nonlinear/neural Networks to overcome the computational burden of traditional DSP technology. Thereby, through operation of various embodiments of the present invention Turbo Equalization may be performed in a more efficient manner.

Abstract: For a hierarchical mobile cellular communications system comprising a plurality of microcells and overlaid macrocells, a method is disclosed for estimating the speed of a mobile. The speed estimate assists in the assignment of slow-moving mobiles to microcells and fast-moving mobiles to macrocells, thus keeping the cellular system in optimum utilization. The method first calculates a power signal of the received signals. The power signal is then filtered and decimated. The speed of a mobile is estimated from a determination of the offset autocorrelation of the filtered and decimated power signal.