Abstract:
PROBLEM TO BE SOLVED: To provide an improved method and apparatus for performing encoding-rate determination in a communication system. SOLUTION: The method of determining the rate associated with a received signal includes a step of detecting the received signal (S40), steps of decoding the received signal at a first rate, determining a first path metric associated with the first rate, decoding the received signal at a second rate, and determining a second path metric associated with the second rate (S44), a step of calculating a plurality of discriminant functions on the basis of the first and second path metrics (S46), a step of comparing at least one of the plurality of discriminant functions to a first predetermined value (S48), and a step of selecting one of the first and second rates as a determined rate on the basis of the comparison. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
A block interleaver (212) suitable for communication over fading channels with convolutionally coded signals as input is disclosed. The block interleaver (212) implements multiple interleaving distances which are matched to the particular convolutional code to provide better performance than conventional block interleavers.
Abstract:
A block interleaver (212) suitable for communication over fading channels with convolutionally coded signals as input is disclosed. The block interleaver (212) implements multiple interleaving distances which are matched to the particular convolutional code to provide better performance than conventional block interleavers.
Abstract:
In a wireless communication system comprising an effective ray detector, a method for detecting and assigning a mobile station signal including receiving a plurality of search metrics, the plurality of search metrics including a plurality of offset energy values at corresponding time offsets, sorting the plurality of search metrics in order of their offset energy values, calculating a plurality of decoding success predictors, and selecting the decoding success predictor having the maximum value. The method also includes forwarding an acknowledgment message declaring signal detection to the mobile station if the maximum decoding success predictor has a value greater than zero. The method further includes assigning receiver demodulation at the time offsets associated with the maximum decoding success predictor if the maximum decoding success predictor has a value greater than zero.
Abstract:
A method and apparatus of determining an encoding rate associated with a received signal (12), where the method including the steps of demodulating in a demodulator (80) to produce a series of metrics (22) representing energies of a series of data symbols carried by received signal (12); decoding in a decoder (20) series of metrics (22) to produce a set of total metrics (TM) (90) corresponding to a set of possible encoding rates; normalizing in a TM normalizer (28) set of TM (90) to produce a corresponding set of normalized TM (23); and determining the encoding rate in a rate determination (24) based on set of normalized TM (23). The normalizing step in TM normalizer (28) includes multiplying a set of effective finger counts (19) by a constant (410) to generate a corresponding set of numbers (420); and subtracting numbers (420) from associating TM (90) to produce normalized TM (23).
Abstract:
A block interleaver (212) suitable for communication over fading channels with convolutionally coded signals as input is disclosed. The block interleaver (212) implements multiple interleaving distances which are matched to the particular convolutional code to provide better performance than conventional block interleavers.
Abstract:
A wireless communication system where voice frames are transmitted in sub-frames, wherein multiple sub-frames constitute a single radio frame, at least one of the sub-frames not having a negative acknowledgement associated therewith, including at a radio access network (120), decoding a voice frame in sub-frame of a received radio frame, the sub-frame having a negative acknowledgement associated therewith, transmitting, from the radio access network, the voice frame in a sub-frame of an other radio frame, the sub-frame of the other radio frame not having an negative acknowledgement associated therewith.
Abstract:
A block interleaver (212) suitable for communication over fading channels with convolutionally coded signals as input is disclosed. The block interleaver (212) implements multiple interleaving distances which are matched to the particular convolutional code to provide better performance than conventional block interleavers.
Abstract:
A method (1700) and apparatus (1801) provide channel estimation with extended bandwidth filters. Antenna (1813) receives a signal such as a pilot signal and detects a bandwidth associated with the pilot signal in a detector (320). One of a plurality of filters (603, 605, 607, and 609) including extended bandwidth filters (311) and a default filter (305) can be selected by a selector (617). If the detector detects activity associated with a wider bandwidth, the filter associated with the wider bandwidth is selected over the presently selected filter. If no activity is detected, the default filter is selected.