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Method for reference signal generation in presence of frequency offsets in communication station with spatial processing

A reference signal and space processing technology, applied in the directions of multiplexing communication, space transmit diversity, polarization/direction diversity, etc., can solve the problem of increasing output SINR

Inactive Publication Date: 2004-02-18
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the uplink, improvements in the nulling capability of this array lead to an increase in the output SINR

Method used

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  • Method for reference signal generation in presence of frequency offsets in communication station with spatial processing
  • Method for reference signal generation in presence of frequency offsets in communication station with spatial processing
  • Method for reference signal generation in presence of frequency offsets in communication station with spatial processing

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Embodiment Construction

[0048] The invention is applicable to any digital radio receiver that is subject to frequency offset and includes spatial processing means. These illustrative embodiments are used in radio receivers that use arrays of antenna elements to receive respective sets of antenna signals and use spatial processing means to weight these antenna signals in magnitude and phase. In particular, the illustrative embodiments are used in base stations of cellular systems using the Personal Handyphone (PHS) air interface standard. The PHS system uses Time Division Multiple Access (TDMA) with individual time slots corresponding to conventional channels. The PHS also uses π / 4 differential quadrature phase-shift keying (π / 4 DQPSK) modulation for the baseband signal, with a baud rate of 192 kilobaud (baud is symbols per second). In the PHS used in this preferred embodiment, a "burst" is defined as a finite duration RF signal transmitted or received over the air during a single time slot. A "grou...

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PUM

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Abstract

A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted by a particular remote station using an initial spatial weight vector corresponding to the particular remote station; determining from the terminal copy signal a reference signal having substantially the same frequency offset and time alignment as the received antenna signals; and computing a new spatial weight vector by optimizing a cost function, the cost function using the received antenna signals and the reference signal. For demodulation, the method further includes extracting the symbols of the modulated signal.

Description

technical field [0001] The present invention relates to the field of wireless communications, and more particularly to the generation of reference signals useful for determining receive weights for spatial processing in the presence of frequency offsets and for demodulating received signals in the presence of frequency offsets. Background technique [0002] This is a continuation-in-part of U.S. Patent Application Serial No. 08 / 729,390, filed October 11, 1996, by Barratt et al., entitled METHODAND APPARATUS FOR DECISION DIRECTED DEMODULATION USINGANTENNA ARRAYS AND SPATIAL PROCESSING (hereinafter the "parent patent"). This parent patent is hereby incorporated by reference in its entirety. [0003] Cellular radio communication systems are known in which a geographical area is divided into cells and each cell includes a communication system for communicating with a Subscriber Station (SU) (also referred to as a remote terminal, mobile unit, mobile station, subscriber station o...

Claims

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Application Information

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IPC IPC(8): H01Q3/26H04B7/08H04B7/10H04J99/00H04L1/06H04L27/00H04L27/22H04L27/233H04L27/38
CPCH04L2027/0095H04L2027/003H04L27/2332H04L1/06H04L2027/0046H04B7/0851
Inventor P·佩特鲁斯A·M·基奥迪尼M·D·特罗特D·M·帕里斯M·尤瑟夫米尔D·罗森菲尔德
Owner INTEL CORP