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Method and system for channel estimation, relating receiver and computer program product

A channel estimation and receiver technology, which is applied in the field of communication systems and can solve the problems of small center frequency and bandwidth deterioration.

Inactive Publication Date: 2007-03-07
TELECOM ITALIA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] Wideband array architectures can be useful even if the signal bandwidth of the array is small with respect to the center frequency, such that the bandwidth penalty is not a critical factor

Method used

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  • Method and system for channel estimation, relating receiver and computer program product
  • Method and system for channel estimation, relating receiver and computer program product
  • Method and system for channel estimation, relating receiver and computer program product

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Embodiment Construction

[0050] The invention will now be described by way of example only with reference to possible applications in a WCDMA system. However, those skilled in the art will quickly appreciate that the same basic arrangement described herein can be applied to other communication systems or standards.

[0051] First, the structure of an uplink dedicated channel of a WCDMA system will be briefly analyzed, again, reference to this particular application is merely exemplary in nature and should not be construed as limiting the scope of the invention.

[0052] Figure 6 shows the frame structure of a WCDMA "uplink" (ie from mobile terminal to radio base station) dedicated physical channel. Each radio frame with a length of 10ms is divided into 15 time slots, and each time slot has a length of T SLOT = 2560 chips, corresponding to one power control cycle.

[0053] There are two types of uplink dedicated physical channels: uplink dedicated physical data channel (uplink DPDCH) and uplink dedic...

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Abstract

A system for performing channel estimation based on a received signal including both known (KS) and unknown (UKS) transmitted symbols, includes detector circuitry (CK1, ..., CKP,L; CM, DU) for detecting the unknown symbols (UKS) by assigning estimated values (EAS) to the unknown symbols, and channel estimator circuitry (M) for performing channel estimation by exploiting both the known symbols (KS) and the estimated values (EAS) assigned to the unknown symbols (UKS). The system has associated multiple receiving antennas. The system is preferably included in a CDMA receiver and the received signal includes known pilot bits (KS) and additional symbols, such as transmit power-control (TPC) commands, feedback information for transmitting antenna diversity, and a transport-format combination indicator (TFCI) that comprise the unknown symbols (UKS).

Description

technical field [0001] The invention relates to communication systems and has been developed by paying particular attention to possible applications to receivers, for example receivers suitable for being equipped with multiple antennas in radio base stations of mobile communication networks. [0002] However, reference to possible fields of application of the invention should not be understood as limiting its scope. Background technique [0003] Multipath is a troublesome effect in many wireless communication systems. In addition to the signal originating from the direct path, other signals originating from the reflected path arrive at the receiver with different delays and attenuations. The main effects of multipath propagation are fading and intersymbol interference. [0004] Diversity methods have been proposed to mitigate these undesired effects. [0005] One of the most effective methods uses spread spectrum signals. By using a signal with a bandwidth greater than t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/08H04L25/02H04B7/005H04B7/06
CPCH04B7/0617H04B7/0857H04B7/0615H04W52/42H04L25/0232H04B7/0619H04L25/0238
Inventor 瓦莱里亚·达米考布鲁诺·米里斯阿尔弗雷多·鲁希托
Owner TELECOM ITALIA SPA
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