A receiver for voice services over adaptive multi-user channels on one slot

A receiver and multi-user technology, applied in the shaping network, baseband system, baseband system components and other directions in the transmitter/receiver, can solve the problem of not being able to effectively suppress external interference

Inactive Publication Date: 2011-11-23
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such receivers cannot effectively suppress any external interference

Method used

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  • A receiver for voice services over adaptive multi-user channels on one slot
  • A receiver for voice services over adaptive multi-user channels on one slot
  • A receiver for voice services over adaptive multi-user channels on one slot

Examples

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Embodiment Construction

[0021] exist figure 1 In , the modulator described in 3GPP TSG GERAN GP-081633 Draft TR on Circuit Switched Voice Capacity Evolution for GERAN is shown. exist figure 2 In , the modulator described in 3GPP TSG GERAN GP-090113 VAMOS Physical Layer Adaptation Schemes is shown. it is figure 1 Brief overview of the modulator shown. figure 1 and figure 2 The difference between the modulators shown is that the figure 2 In , two different pulse shaping filters are used.

[0022] The parameter α defines the shape of the constellation diagram, and the signal is rotated by the angle θ. Without loss of generality, assume that the receiver has to decode the signal for user 1 . The complex-valued channel can be tapped according to L expect user binary symbols Binary symbols for user 2 Synchronous position n0 and noise plus interference (w n ), the baseband received signal sampled at the symbol rate (r n )Referred to as:

[0023] r n...

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Abstract

A receiver, in particular a VAMOS receiver, is provided. The receiver is adapted to split the complex-valued baseband signal into its real and imaginary parts. The two branch system thus created is modeled as a real-valued Multiple Input Multiple Output (MIMO) system. The receiver is further adapted to use correlations of the noise, both in time and between branches of a channel to suppress the noise for multi-users in the same channel. In accordance with one embodiment the receiver is adapted to take into account the known symmetries present in a symbol constellation when more than one user exists in the same channel. This is for example the case in adaptive symbol constellation such as an adaptive alpha - QPSK constellation. Using the receiver in accordance with the above can provide the same performance as a joint detection receiver in the presence of Gaussian white noise, while giving better interference suppression than either SAIC or joint detection in the presence of GMSK modulated interference.

Description

technical field [0001] The invention relates to a method and a receiver for receiving signals in a mobile station. In particular, the present invention relates to a method and receiver for receiving VAMOS transmitted signals. Background technique [0002] The rapid increase in the number of subscribers in the Global System for Mobile Communications (GSM) has increased the need for increased voice capacity. Accordingly, mobile network operators and telecommunication equipment manufacturers have agreed to start a new Release 9 work item in the 3rd Generation Partnership Project (3GPP) standardization. This work item has been named "Voice Services over Adaptive Multi-User Channels over a Time Slot" (VAMOS). It is described in 3GPP TSG GERAN GP-081949 "New WID: Voice services over Adaptive Multi-user Orthogonal Sub channels". [0003] The VAMOS air interface is based on the concept of an adaptive symbol constellation, see about 3GPP TSG GERAN GP-081633 Draft TR on Circuit Swi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L2025/03426H04L25/03006
Inventor 米格尔・洛佩斯
Owner TELEFON AB LM ERICSSON (PUBL)
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