Nxp Usa, Inc.

Igor Levakov

Roi Menahem Shor

Vincent Pierre Martinez

Avraham Dov Gal

Haim Ben-Lulu

Haim Bareket

Matanya Handler

A method including receiving, by an antenna combiner of a wireless communication system, a set of Random Access Channel (RACH) sequences of a first RACH signal from a first antenna and a set of RACH sequences of a second RACH signal from a second antenna. The method further including selecting, by the antenna combiner, each RACH sequence of the set of RACH sequences of a selected RACH signal from a selected antenna that has a best Signal to Interference plus Noise Ratio (SINR) from each RACH sequence of the set of RACH sequences of the first RACH signal from the first antenna that has a first SINR and each RACH sequence of the set of RACH sequences of the second RACH signal from the second antenna that has a second SINR.

Linear combination for RACH detection

A predistortion method and apparatus are provided which use a DPD actuator () to apply a memory polynomial formed with first DPD coefficients to a first input signal x[n], thereby generating a first pre-distorted input signal y[n] which is provided to the non-linear electronic device () to produce the output signal, where the memory polynomial may be adaptively modified with a digital predistortion adapter () which computes second DPD coefficients u[n] with an iterative fixed-point conjugate gradient method which uses N received digital samples of the first pre-distorted input signal y[n] and a feedback signal z[n] captured from the output signal to process a set of conjugate gradient parameters (u, b, v, r, &#x3c9;, &#x3b1;, &#x3b2;) at each predetermined interval, thereby updating the first DPD coefficients with the second DPD coefficients u[n] generate a second pre-distorted input signal which is provided to the non-linear electronic device.

Fixed-point conjugate gradient digital pre-distortion (DPD) adaptation

An equalizer circuit of a particular equalization stage of a equalizer circuit is omitted, and input signals that would have otherwise been received at the omitted equalization circuit bypass the equalization stage and are instead processed at an equalizer circuit included at the next stage. Thus, a subset of the received frequency-domain signals can be processed by equalizer circuits at a first stage, while the remaining received frequency-domain signals bypass the first stage and are processed at an equalizer circuit included at a second stage.

System and method for large dimension equalization using small dimension equalizers and bypassed equalizers

An equalizer for equalizing a composite signal originating from a given number of simultaneous data streams able to be received over a communication channel, on a given number of antennas, at one or more radio units, in a wireless communication system. The equalizer performs matrix operations when the number of receiving antennas associated with the composite signal is lower than the number of antennas supported by the equalizer. The channel matrix and the signal and interference covariance matrices are manipulated. The antenna dimension is increased, padding is then added and the transmitted signal vector is finally determined based on the altered matrices. A baseband processing unit, a method and a computer program are also claimed.

Growing community of inventors

Kfar Saba, Israel

Igor Levakov