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A receiver for MUROS adapted to estimate symbol constellation using training sequences from two sub-channels

A receiver and sub-channel technology, applied in baseband systems, digital transmission systems, electrical components, etc., can solve problems such as unusable

Inactive Publication Date: 2011-01-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the shape of the symbol constellation may not be known, this scheme cannot be used if hybrid quadrature modulation is used

Method used

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  • A receiver for MUROS adapted to estimate symbol constellation using training sequences from two sub-channels
  • A receiver for MUROS adapted to estimate symbol constellation using training sequences from two sub-channels
  • A receiver for MUROS adapted to estimate symbol constellation using training sequences from two sub-channels

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Embodiment Construction

[0023] Below, the diacritic ^ on top of a variable indicates the estimator for that variable. exist figure 1 In , a modulator 400 is described that is configured to divide the total energy of a QPSK modulated channel unequally between the two branches of the modulated signal. The exemplary modulator 400 may be used in data transmission using adaptive alpha-QPSK modulation. Modulator 400 includes initial modulators 401 and 403 for receiving data sequences to be transmitted to two different mobile stations and modulating them into binary symbols. The modulators 401 and 403 are coupled to a mapping unit 405 adapted to map the signals from the modulators 401 and 403 according to an adaptive α-QPSK constellation as described above. The adaptive α-QPSK constellation sequence formed in unit 405 is forwarded to a rotation block 470 connected to a pulse-shaping filter 409, which in turn is connected to a unit 411 adapted to map the The multiplexed data sequence is amplified and upm...

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Abstract

A receiver is provided that is configured to estimate the symbol constellation of a signal modulated using a quaternary symbol constellation where data is transmitted to two mobile stations multiplexed on a shared channel comprising two branches, where the branches correspond to the real and imaginary parts of one complex-valued baseband signal. The receiver is configured to demodulate the modulated signal using the training sequences from both sub-channels.

Description

technical field [0001] The invention relates to methods and devices for receiving signals transmitted in a cellular radio system. Background technique [0002] The rapid growth of the subscriber base in GSM (Global System for Mobile Communications) has accentuated the need for increased voice capacity. Consequently, both mobile network operators and telecom equipment manufacturers have agreed to start new research projects in the 3GPP standard. The research project is called MUROS and is described in GP-072027, "WID on MUROS". The basic idea is to allow two users to share the same frequency band and the same time slot in downlink and uplink. There are several possible technical implementations of MUROS. One proposed technique is to use hybrid quadrature modulation in the downlink channel. Map the two user signals to the real and imaginary parts of the baseband signal. These are called I and Q subchannels, and under some conditions, the I and Q subchannels are orthogonal...

Claims

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Application Information

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IPC IPC(8): H04L25/00
CPCH04L27/22H04L25/0224H04L25/0242H04L25/0212
Inventor 米格尔·洛佩斯托马斯·安德森
Owner TELEFON AB LM ERICSSON (PUBL)
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