Abstract:
Un método de tratar una señal de tráfico modulada en amplitud en un receptor de comunicación inalámbrica quecomprende:calcular (100; 114) una desviación de ganancia entre la señal de tráfico y una señal de referencia recibida enasociación con la señal de tráfico , como una función de la magnitud media de los símbolos de tráficoestimados y una primera relación señal - ruido determinada a partir de la señal de referencia, yescalar (102, 120) los símbolos de tráfico estimados sobre la base de la desviación de ganancia para obtenerlos símbolos estimados y escalados del tráfico para su posterior tratamiento.
Abstract:
The technology comprises method(s) and apparatus for operating a telecommunications system. In its basic form the method comprises providing plural channelization codes for potential use by an uplink receiver; using unused channelization codes of the plural codes to generate an estimate of an impairment covariance matrix; and using the estimate of the impairment covariance matrix to form a processing parameter. For example, the processing parameter can be one or more weight values which, in turn, are can be used for generating a combined output signal.
Abstract:
Signal quality estimation and demodulation are tailored to the received signal quality. According to one embodiment, a received signal is processed by determined a first set of combining weights based on a first impairment covariance estimate derived assuming a low signal quality environment (300 and 302). A second set of combining weights is determined based on a second impairment covariance estimate derived assuming a high signal quality environment (304 and 306). A metric is determined corresponding to the difference between symbol estimates derived from the second set of combining weights and hard symbol decisions (308). The received signal demodulated based on the second set of combining weights if the metric satisfies a threshold indicating high signal quality and otherwise based on the first set of combining weights (310, 312 and 314).
Abstract:
A transmitter, channel coder, and method for coding and transmitting a sequence of symbols in a digital communication system utilizing soft pilot symbols. In one embodiment, the transmitter transmits a set of soft pilot symbols with higher reliability than the remaining symbols in the sequence by modulating the soft pilot symbols with a lower order modulation such as BPSK or QPSK while modulating the remaining symbols with a higher order modulation such as 16QAM or 64QAM. The transmitter shares the modulation type and location (time/frequency/code) of the soft pilot symbols with a receiver. Unlike traditional fixed pilots, the soft pilots still carry some data. Additionally, the soft pilots are particularly helpful in establishing the amplitude reference essential in demodulating the higher order modulation symbols. In another embodiment, soft pilot symbols are inserted by low-level puncturing of channel encoded bits and replacing the punctured bits with known bit patterns.