Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for minimizing channelization code which user equipment has to monitor per cell for acrive setting in a wireless communication system providing high speed uplink packet access. SOLUTION: Each user equipment and base station includes a transmitter, a receiver, and a controller. The user equipment transmits data packets to the base station. The base station transmits control information, corresponding to the data packets, to the user equipment. The control information includes an absolute grant channel indicator. The controller of the user equipment minimizes channelization code per scheduling active set cell to be monitored by the user equipment based on the absolute grand channel indicator in response to handoff and/or entering an active channel state. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus (100) and a method (400) suitable for use in a communication device by equalizing an input signal received to mitigate multipath distortion effects present in the input signal in the communication device. SOLUTION: A first filter (102) samples an input signal (104) and generates a first filter output (106) based upon the sampled input signal and a filter coefficient array (108). An error signal (112) is then generated based upon a difference between the first filter output (106) and a desired signal (114), and the filter coefficient array (108) is updated based upon a product of the error signal (112) and an adaptation constant (118). A second filter (126) samples a delayed input signal (124) and generates a second filter output (128) based upon the sampled delayed input signal and the filter coefficient array (108). COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication system and method in which high speed uplink packet access to a base station is made from user equipment. SOLUTION: Each user equipment 128, 130 and base station 114, 116, 118, 120 includes a transmitter, a receiver, and a controller. The user equipment 128, 130 transmits data packets to the base station 114, 116, 118, 120. The base station transmits control information corresponding to the data packets to the user equipment 128, 130. The control information includes at least one channelization code allocated to the user equipment 128, 130. The controller minimizes the channelization code per scheduling active set cell to be monitored by the user equipment based on the channelization code in response to handoff and/or transferring to an active channel state. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system for reducing the number of channelizing codes to be minimum, which must be monitored for each cell, when a user device is in an active set. SOLUTION: In a wireless communications system and a method for performing high-speed uplink packet access to a base station from the user device, each of the user device and the base station includes a transmitter, a receiver, and a controller. The user device is designed to transmit a data packet to the base station. The base station is designed to transmit control information corresponding to the data packet to the user device. The control information includes a user device absolute addition channel identification and includes at least one channelizing code assigned to the user device. The controller reduces the number of channelizing codes to be a minimum, which must be monitored for each cell by the user device, based on the channelizing code absolute addition channel identification, based on the transition to a hand-off state and/or to an active channel state. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a lake receiver and a finger managing method improved for providing the merit of path diversity even when the interval of multipath radio waves is shorter than one-chip time. SOLUTION: A lake receiver 112 is provided with plural fingers 122, 124 and 128. Each finger is provided with a demodulator for demodulating the radio waves of multiple path signals and a time tracking circuit for controlling the timewise position of the finger based on the timewise position of the radio wave. Low delay spreading conditions are detected, the positions of two adjacent fingers are controlled and fingers more than two are prevented from being converged around a common timewise position. By maintaining the timing intervals of fingers, even during low delay spreading conditions, the path diversity is effectively utilized by the lake receiver 112 and the performance of the receiver is improved.
Abstract:
A demodulator (414) for improving bit error rate performance consists of a zero threshold comparator circuit (502), a first threshold detector circuit (508), and a second threshold detector circuit (504). The first threshold detector circuit (508) compares the frequency information signal to a predetermined threshold, which is selected to optimize bit error rate performance. The second detector threshold circuit (504) is used to ensure that an alternating bit pattern has occurred. The demodulator (414) also includes a control device circuit (516) for coupling a plurality of bits (522) from a zero threshold comparator (502) to the output of the control device as a decision output signal (416) when the frequency information signal falls outside of either the first or second detector thresholds (508, 504). If the frequency information signal falls within both thresholds of the detector devices, then the decision output signal (416) for the control device (516) is formed by inverting the bit decision from the previous bit interval.
Abstract:
An apparatus (100) and a method (400) suitable for use in a communication device by equalizing an input signal received to mitigate multipath distortion effects present in the input signal in the communication device are provided. A first filter (102) samples the input signal (104) and generates a first filter output (106) based upon the sampled input signal and a filter coefficient array (108). An error signal (112) is then generated based upon a difference between the first filter output (106) and a desired signal (114), and the filter coefficient array (108) is updated based upon a product of the error signal (112) and an adaptation constant (118). A second filter (126) samples a delayed input signal (124) and generates a second filter output (128) based upon the sampled delayed input signal and the filter coefficient array (108). The duration of the delay (120) applied to the input signal or/and the adaptation "constant" may be varied based upon a rate of change of the input signal.
Abstract:
A method of activating a radiotelephone operable in a spread-spectrum multiple access radiotelephone system. A searcher receiver ( 114 ) is activated, and the searcher receiver ( 114 ) acquires a PN sequence timing of a pilot signal. At least one demodulation branch ( 122 ) is activated after activation of the searcher receiver ( 114 ), and the demodulation branch synchronizes to the PN sequence timing of the selected pilot signal after the searcher receiver ( 114 ) has acquired the PN sequence timing.
Abstract:
By time-sharing demodulator hardware between a primary data path (165), a power control data path (161), and a received signal strength indicator (RSSI) path (163), an entire power control data path (161) can be implemented in a demodulator (140) of a spread spectrum subscriber unit receiver with a low increase in gate count. The primary data path (165) and the power control data path (161) time-share a complex conjugate generator (270), a complex multiplier (280), and a real component extractor (290). Due to timing requirements, though, the channel estimation filter (240) of the primary data path cannot be time-shared with the power control data path. Instead, dynamic coefficient scaling is added to an infinite-duration impulse response (IIR) filter in the RSSI path (163) so that the IIR filter (250) with dynamic coefficient scaling can be time-shared between the RSSI path (163) and the power control data path (161).
Abstract:
A method of activating a radiotelephone operable in a spread-spectrum multiple access radiotelephone system. A searcher receiver ( 114 ) is activated, and the searcher receiver ( 114 ) acquires a PN sequence timing of a pilot signal. At least one demodulation branch ( 122 ) is activated after activation of the searcher receiver ( 114 ), and the demodulation branch synchronizes to the PN sequence timing of the selected pilot signal after the searcher receiver ( 114 ) has acquired the PN sequence timing.