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Channel estimation in cellular communication system

A technology of cellular communication system and communication channel, applied in the field of cellular communication system, can solve the problems of short channel coherence time and difficulty in adopting filtering technology, etc.

Inactive Publication Date: 2004-06-23
NOKIA NETWORKS OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the mobile station is moving at a high speed, due to the short channel coherence time, it is difficult to adopt an appropriate filtering technique

Method used

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  • Channel estimation in cellular communication system
  • Channel estimation in cellular communication system
  • Channel estimation in cellular communication system

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Experimental program
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Embodiment Construction

[0038] figure 1 It is a block diagram of a basic receiving system in a CDMA cellular communication network. picture figure 1 It is a block diagram of a basic receiving system in a CDMA cellular communication network. figure 2 is a block diagram illustrating an application of the present invention. In other words, the CDMA mobile communication system allows a plurality of mobile stations MS1, MS2, MS3 to communicate with a base station BTS on respective channels CH1, CH2, CH3 by means of RF signals in a common cell. These channels can be distinguished from each other by using spreading codes in a well known manner.

[0039] now back to figure 1 , the input signal from the antenna 30 is received by the RF unit 28 and supplied to an analog / digital (A / D) converter 32 . The A / D converter samples the input signal at intervals i to generate digitized sampled values ​​x. It is easy to understand that when a signal reaches the receiving circuit, it has gone through multiple path...

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Abstract

A method for channel estimation in a cellular communication system is described. Symbols are transmitted between a mobile station and a base station. According to the described method, an incoming signal is received via a communication channel. A first estimate for the channel impulse response of that communication channel is provided and used to process the incoming signal to generate an estimated data symbol. The estimated data symbol is used to generate a soft output feedback decision which is then used to make a further estimate of the channel impulse response. According to a variation, the further estimate of channel impulse response is made by performing a correlation process between a conjugate version of a spreading code used to spread the incoming signal and the incoming signal itself. The results of that process are multiplied by a feedback decision.

Description

technical field [0001] The present invention relates to a method and circuit for channel estimation in a cellular communication system. [0002] In particular, the invention relates to a cellular communication system in which data is transmitted in a plurality of data symbols over consecutive time slots. As is well known, in a CDMA system, a unique spreading code is used for each of a plurality of communication channels to modulate the data symbols to be transmitted to encode the transmitted data. In each cell of a cellular communication system, spreading codes allow a plurality of different mobile stations to communicate with a base station on their own specific coded channels. Background technique [0003] When the signal is transmitted between the base station and the mobile station (or in the uplink or in the downlink), the signal receiving unit needs to establish some information about the communication path of the signal propagation based on the received signal, which...

Claims

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Application Information

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IPC IPC(8): H04L27/32H04B1/7097H04B7/005H04B7/26H04J13/00H04L25/02
CPCH04L25/0236H04L25/0212
Inventor 覃正笛
Owner NOKIA NETWORKS OY