Qualcomm Incorporated

Abhinav Gupta

Aditya Dua

Amir Farajidana

Gokhan Mergen

Seyedkianoush Hosseini

Jia Tang

Parvathanathan Subrahmanya

Jong Hyeon Park

Chun-Hao Hsu

Amith Vikram Chincholi

Nate Chizgi

Feng Lu

Subramanya P Rao

Atul Arvind Salvekar

Jonathan Sidi

Young Geun Cho

Chulong Chen

Jimmy Chi-Wai Chui

Shantanu Khare

Nathan Yee

Subramanya P N Rao

Subramanya Padubidri Nanyam Rao

Atul A Salvekar

Methods, systems, and devices for wireless communications are described for mapping demodulation reference signal (DMRS) data to resource elements (REs) within a shortened transmission time interval (sTTI) so as to avoid collision with other reference signal data that the sTTI may be configured to include, such as channel state information reference signal (CSI-RS) data, cell-specific reference signal (CRS) data, or the like. A base station may select a DMRS mapping pattern for an sTTI based on one or more factors, including a CSI-RS configuration, a CRS configuration of the sTTI, an antenna port configuration for CRS (e.g., a number of CRS ports and associated number of layers configured for CRS, such as a one port CRS having a two-layer configuration, or a two port CRS having a four-layer configuration), or a type of subframe that includes the sTTI.

Reference signal multiplexing in shortened transmission time intervals

UEs are adapted to facilitate reconstruction of a segment of corrupted bits. According to one example, a UE can receive a control channel transmission such as a HS-SCCH transmission. The control channel transmission may include a plurality of information bits and a plurality of cyclic redundancy check (CRC) bits. The UE may further determine that a contiguous segment of the received information bits is corrupt. The UE may accordingly utilize the uncorrupted information bits and CRC bits to reconstruct the corrupt information bits. In some instances, the UE may utilize the uncorrupted bits to reconstruct the corrupt information bits using a new generator polynomial. In other instances, the UE may utilize the uncorrupted bits to reconstruct the corrupt information bits using the original generator polynomial.

Devices and methods for reconstructing corrupted control channel bits

One or more aspects of the disclosure provide an efficient equalization scheme capable of mitigating multi-path interference on channels with large delay spread using short-length equalizers. That is, by dividing stored samples of a signal received on the multi-path channel by time into a plurality of clusters, a short-length equalizer can be utilized in an iterative fashion on each of the clusters, thus eliminating the need for a large length equalizer while still providing improved performance over that of a Rake receiver at large delay spreads. Other aspects, embodiments, and features are also claimed and described.

Apparatus and method for iterative interference cancellation in a wireless communication network

Methods and apparatus are described for processing a signal in a communication system. A signal may be received a user equipment, and a pilot transmission from a non-primary transmit antenna of a cell in the communication system may be detected in the signal based on metrics associated with a pilot channel. Information about the pilot channel is not signaled to the user equipment. The detected pilot transmission is used to improve receiver processing of the signal.

Non-primary pilot channel discovery for interference cancellation

A method for using a joint decoding engine in a wireless device is disclosed. A first symbol stream and a second symbol stream in a received multiple input multiple output (MIMO) signal is determined. A scaled channel estimate for a wireless transmission channel and a scaled noise covariance of the MIMO signal are also determined. The scaled channel estimate and the first symbol stream are whitened. Max log maximum a posteriori (MLM) processing is performed on the whitened first symbol stream to produce a first data stream. The first data stream may be de-rate matched and decoded to produce a decoded first data stream.

Using joint decoding engine in a wireless device

Methods and apparatuses for data aided channel quality estimation using both pilot and data information are disclosed herein. In one exemplary aspect, a method for estimating channel quality in a wireless communication system is disclosed. The method comprises estimating a pilot noise variance based on a pilot signal received from a base station on a downlink and estimating a data noise variance based on a data signal received from the base station on the downlink. The method also comprises combining the pilot noise variance and the data noise variance to obtain a combined noise variance, and estimating the channel quality based on the combined noise variance.

Method and apparatus for data aided channel quality estimation

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San Jose, CA, United States of America

Abhinav Gupta