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Prefiltering in mimo receivers

A pre-filter, radio receiver technology, applied in the direction of shaping network, space transmit diversity, channel estimation, etc. in the transmitter/receiver, which can solve the problem of not guaranteeing the minimum phase channel Givens rotation, etc.

Inactive Publication Date: 2018-03-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polynomial QR decomposition as done by Foster et al. is based on Givens rotation which does not guarantee the minimum phase channel after prefiltering

Method used

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  • Prefiltering in mimo receivers
  • Prefiltering in mimo receivers
  • Prefiltering in mimo receivers

Examples

Experimental program
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Effect test

Embodiment Construction

[0061] figure 1 A MIMO-enabled mobile communication terminal 100 is schematically illustrated, including a processor 102 , a memory 104 , radio frequency RF receive and transmit circuitry 106 , and a plurality of antenna elements 111 . As the skilled person will understand, the radio communication via the antenna 111 is achieved by the RF circuit 106 controlled by the processor 102 . The processor 102 uses software instructions 105 stored in the memory 104 in order to control all functions of the terminal 100, including the function of the receiver circuit in the RF circuit 106, which is described in detail below with respect to demodulation. In other words, at least the RF circuit 106, the processor 102, and the memory 104 form part of a control and communication circuit that is configured to control demodulation as outlined above and described in detail below. Further details on how these units operate to perform normal functions within a mobile radio communication system ...

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Abstract

Demodulates data signals transmitted by a plurality of transmit antennas over a radio channel. The method includes receiving (202) a data signal and a reference signal on a plurality of receive antennas, the content of the reference signal being known a priori to the receiver. The content of the reference signal is used to compute (204) an estimated polynomial channel matrix. Compute the (206,208) polynomial pre-filter matrix by decomposing the estimated polynomial channel matrix into the product of a pseudo-unitary polynomial matrix and an upper-triangular polynomial matrix with a minimum phase filter on its main diagonal, where by computing the pseudo-unitary polynomial matrix Pseudoconjugate of a unitary polynomial matrix to obtain a polynomial prefilter matrix. The received data signal is modulated (212), wherein the received data signal is multiplied by the computed polynomial prefilter matrix.

Description

technical field [0001] The field of the present disclosure is that of controlling multiple-input multiple-output MIMO receivers. In particular, calculations associated with determining the characteristics of the radio channel between the transmitter and the MIMO receiver in order to improve the performance when demodulating the received signal. Background technique [0002] In a mobile wireless communication system using multi-user MIMO (MU-MIMO), several users are scheduled to transmit simultaneously during the same time and frequency interval. These users can be differentiated by assigning different and preferably orthogonal reference signals to them so that all channels from all transmit antennas to all receive antennas can be estimated. Reference signals (or training sequences) are sequences known to the receiver and they are transmitted with the user signal so that the receiver can estimate the distortion of the received signal after its transmission. [0003] MU-MIMO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04L25/02H04L25/03
CPCH04B7/06H04B7/08H04L25/0204H04L25/0228H04L25/0242H04L25/0246H04L25/03891H04B7/0413H04L2025/03426H04L25/03H04B1/40
Inventor H·萨林M·洛佩兹
Owner TELEFON AB LM ERICSSON (PUBL)
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