Abstract:
A method of generating a signal being phase-shifted at a predetermined phase- shift division factor relative to a reference signal is disclosed. The method comprises: using the predetermined phase-shift division factor for selecting a modulation amplitude, modulating a control signal at the selected modulation amplitude, and combining the reference signal and the control signal to form the phase- shifted.
Abstract:
A method of mapping a plurality of different bit sequences (u) to a plurality of different signal points (x) in a constellation, the number of bit sequences (u) being greater than the number of signal points (x), said method comprising, for a device in a telecommunication network, the acts of: - determining, for each signal point (x) in the constellation, a number of bit sequences (u) to be mapped to said each signal point (x), the numbers of bit sequences (u) being distributed according to a discrete Gaussian distribution among the constellation, - selecting in the plurality of bit sequences (u), f o r e a c h s i g n a l p o i n t (x) in the constellation, a set comprising the determined number of bit sequences (u) that minimize the maximal Hamming distance among the selected sets.
Abstract:
A method and a device for processing data blocks are provided, wherein each resource unit comprises at least two portions of user data, wherein each portion of user data is associated with a user; and wherein subsequent resource units comprise different combinations of portions of user data. Furthermore, a communication system is provided comprising such a device.
Abstract:
A method for using orthogonal sub-channels (OSCs) in a wireless transmit/receive unit (WTRU) employing the Multiple Users Reusing One Titneslot (MUROS) concept. A capability report is received from the WTRU, including an indication whether the WTRU supports OSCs. A determination is made whether to use OSCs for the WTRU and the result of the determination is signaled to the WTRU. If OSCs are used with the WTRU, the signaling includes an OSC assignment for the WTRU. In one embodiment, two resources are assigned to the WTRU and each resource is assigned to a different OSC.
Abstract:
A programmable compute unit with an internal register with a bit FIFO for executing Viterbi code is configured to accumulate in the forward path the best-path to each state in an internal register and store the survivor trace back information bit for each state in each stage in a bit FIFO; and in the trace back, selecting the optimal best-path through the Viterbi trellis by tracing through the bit trace back information survivor bits beginning with the survivor bit of the last stage path; and generating in response to the Viterbi constrain length and a current bit FIFO address, the next bit FIFO address and decoded output bit for the next previous stage.
Abstract:
Establishing communication between a first device and a second device participating in a reservation based communication protocol over a communication network and sharing the reservation to allow for data to be transmitted from both devices during the reservation.
Abstract:
The present invention improves the performance of adaptive antenna array processing systems. In particular, the present invention aims to optimize reception and transmission of signals that employ convolutional coding and Viterbi decoders. The present invention utilizes certain information from Viterbi decoders to improve the performance of a genetic algorithm in optimizing the reception and transmission of signals in an adaptive antenna array system.
Abstract:
A method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation (QAM) are disclosed. A transmitting wireless transmit/receive unit (WTRU) maps N input bits to one of 2N symbols in a 2N-QAM constellation. A receiving WTRU receives a signal and generates a sample of the received signal. A soft bit value of the most significant bit (MSB) is calculated based on a value of the sample. A magnitude of the soft bit value of the MSB is subtracted from a threshold. The threshold is initially set with respect to the QAM order, N. A soft bit value of the next MSB is calculated based on the subtraction results. The calculation and subtraction steps are repeated for the next MSB until soft bit values of all the remaining bits are obtained while diving the threshold by 2 each iteration.
Abstract:
An algorithm for correcting the output of an analog I/Q demodulator (10) without the need for calibration or storing state information. The output of the analog I/Q demodulator (10) is digitized, and the discrete-time samples are divided into segments. A digital frequency transform (e.g., a Discrete Fourier Transform) (35) is computed for each segment. The effects of the non-ideal 1/Q demodulator are removed by identifying a set of image frequency candidates for each digital frequency transform, and for each image frequency candidate, estimating a set of demodulator imbalance parameters to characterize the demodulator imbalance at that frequency and correcting the digital frequency transform at the image frequency candidate using the imbalance parameters in order to minimize the effects of the imbalance. Each digital frequency transform is corrected independently and consequently no persistent state information needs to be saved between transforms.
Abstract:
For short-term link adaptation, a base station obtains instantaneous information for the channel condition seen by a subscriber station and for long-term link adaptation, the base station obtains distribution information for the channel conditions seen by the subscriber station over a period of time (901). A modulation/coding scheme is computed based on the distribution (905). Data is then outputted for transmission (909).