Abstract: Turbo encoded information that comprises first systematic bits, first parity bits, second systematic bits, and second parity bits is decoded by supplying the first systematic bits and the first parity bits to a first decoder; supplying the second systematic bits and the second parity bits to a second decoder; and operating the first and second decoders in parallel for a number, m, of half-iterations, wherein m?1. For each of the m half-iterations, the first decoder utilizes soft information supplied as an output from the second decoder in a preceding half-iteration, and the second decoder utilizes soft information supplied as an output from the first decoder in the preceding half-iteration. An early iteration termination decision is made by, after one or more of the m half-iterations, deciding whether to stop operating the first and second decoders by comparing an output from the first decoder with an output from the second decoder.

Abstract: A method and system are described for performing fast and simple M-QAM detection on received signals, such as a 16-QAM signal, by estimating M-QAM symbol constellation decision boundaries. Amplitude information is collected for in-phase and quadrature phase components of the received signal over a number of symbols. An average of the absolute value of the amplitude information of the in-phase components and of the quadrature phase components is determined over the number of symbols. The determined average absolute values of the in-phase and quadrature phase components provide a reference to produce the decision boundary estimates. Bias compensation may optionally be applied to the decision boundary estimates based on the estimated signal-to-interference ratio (“SIR”) of the received signal to produce bias corrected decision boundary estimates.

Abstract: A method and device for transmitting signals of a first category and signals of a second category over a link, said link providing a predetermined signal transmission rate, where said signals of the first category have a discontinuous characteristic comprising periods of activity and periods of inactivity, where a first channel is provided for carrying signals of the first category and a second channel is provided for carrying signals of the second category, and where the two channels each have respective proportions of the predetermined signal transmission rate of the link during periods of activity of the signals of the first category, and the proportion of the signal transmission rate assigned to the second channel during periods of inactivity of the signals of the first category is increased with respect to the period of activity.

Abstract: In accordance with exemplary embodiments of the invention, throughput and capacity in a TDMA system are increased using several different channels all operating simultaneously on the same carrier frequency. In a first embodiment, a base station in a cell in the system simultaneously transmits a different information sequence from each antenna of a transmitter, on the same carrier frequency. Mobile stations in the cell each receive the signals from the base station antennas as a composite signal, and then use known synchronization information to extract a desired information sequence from the composite signal. In a second embodiment, the different information sequences are all intended for the same mobile station, which uses the synchronization information to extract each sequence from the composite signal. In a third embodiment of the invention, the base station simultaneously transmits identical information sequences to a mobile station via different antennas.

Abstract: A system and method for DC offset compensation wherein a received first signal is despread using a first spreading code to generate a second signal. The second signal along with a first set of pilot symbols is used to estimate a radio channel. The first signal is also despread using a second spreading code to generate a third signal. A DC offset is estimated from the third signal, the estimated radio channel and a second set of pilot symbols. The estimated DC offset may then be subtracted from the second signal.

Abstract: In a packet based data transmission including automatic repeat request (ARQ) protocols, the memory consumption of the ARQ protocol is reduced by compression/decompression of failed data block prior to combination with the retransmitted data blocks using low complexity compression/decompression algorithms. The compression algorithm includes of two parts: calculating and storing a scale factor that estimates the soft values in the data block, and storing the each soft values' sign in local memory instead of the complete soft value. Since one bit is sufficient to store the sign of each soft value, the memory consumption of a data block containing N soft values is N bits. Note, the scale factor increases the memory consumption, in bits, with the word length of the scale factor. However, the relative memory increase becomes smaller the larger the data block.