Abstract: In a wireless communication system including a radio-signal receiver and a radio-signal transmitter, the radio-signal receiver includes a unit for making a generalized inverse matrix for carrying out maximum likelihood estimation, based on a matrix indicating a training series used for carrying out channel estimation, a unit for carrying out singular value decomposition to the generalized inverse matrix, a unit for truncating singular values in the generalized inverse matrix in accordance with a threshold by which a singular value is turned to zero in a greater order, a unit for estimating an impulse-response vector, based on the generalized inverse matrix, a unit for interpolating zero to the impulse-response vector, and a unit for acquiring channel estimation by carrying out Fourier transform, and the radio-signal transmitter includes a unit for quantifying spread of the singular values, and optimizing the training series in accordance with the quantified spread of the singular values, to thereby make a new

Abstract: Methods and apparatus for processing a data stream for high speed wireless Transmission. At the transmission side, the methods and apparatus rate-match an encoded stream of combined information bits and corresponding cyclic redundancy bits in two stages. The first rate matching stage punctures (throws away) or repeats bits such that the number of bits in the data stream is equal to the size of a mobile unit buffer. The second rate matching stage further punctures or alternately repeats bits in the data stream so that the total number of bits in the resulting data stream is equal to the frame size of the transport channel. The bits punctured or repeated by the second rate matching varies according to different versions of parameters for any retransmissions. At the receiver side, the two-stage rate matching is reversed to restore the original encoded data stream. The encoded data stream is then decoded and repeated, if necessary.

Abstract: A circuit for detecting a transmit diversity signal comprises a first circuit (706) arranged to receive a first synchronization code. The first synchronization code is modulated by a data signal. The first circuit produces a first output signal. A second circuit (732) is arranged to receive a plurality of predetermined signals. The second circuit produces a channel estimate. A detection circuit (710, 712) is arranged to receive the first output signal and the channel estimate. The detection circuit produces a signal corresponding to the data signal.

Abstract: An argument approximation method is used to estimate the frequency offset for an automatic frequency control (AFC) circuit. An angle of rotation can be calculated as arctan(Q/I), where Q is the imaginary component of the rotation and I is the real component of the angle. Rather than use the arctangent calculation, which is resource intensive, to calculate the angle of rotation, the angle of rotation is calculated as the sine of the angle of rotation, which is easily calculated from Q and I, and the sine approximation is offset by a correction factor of 1−cos (&thgr;) in order to reduce approximation errors.

Abstract: Methods and apparatus for processing a data stream for high speed wireless Transmission. At the transmission side, the methods and apparatus rate-match an encoded stream of combined information bits and corresponding cyclic redundancy bits in two stages. The first rate matching stage punctures (throws away) or repeats bits such that the number of bits in the data stream is equal to the size of a mobile unit buffer. The second rate matching stage further punctures or alternately repeats bits in the data stream so that the total number of bits in the resulting data stream is equal to the frame size of the transport channel. The bits punctured or repeated by the second rate matching varies according to different versions of parameters for any retransmissions. At the receiver side, the two-stage rate matching is reversed to restore the original encoded data stream. The encoded data stream is then decoded and repeated, if necessary.

Abstract: A single-input double-output blind model system identification method for estimating a channel order and reducing communications errors in a transmitted data sequence s(n), wherein the channel is represented by h1 and h2. The method is performed according to a SIDO model.