Channel estimation in a radio receiver

A technique for channel estimation and signal reception

Inactive Publication Date: 2005-07-13
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, all known higher-order interpolation methods have high computational complexity and often large delays
Also, for very high-speed mobile stations, even second-order interpolation is insufficient

Method used

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  • Channel estimation in a radio receiver
  • Channel estimation in a radio receiver
  • Channel estimation in a radio receiver

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Embodiment Construction

[0031] A wideband CDMA signal is transmitted from a remote transmitter, eg, located in a base station, and propagates over multiple propagation channels to a receiver, eg, located in a mobile station. Traditionally, the received signal is despread by a matched filter, where it is decomposed into multiple narrowband modulated signals, where these signals propagate through different channels with different propagation characteristics. Each narrowband modulated signal is processed by one of the fingers of the RAKE receiver before being fed back to the RAKE combiner for further processing.

[0032] In order to provide channel estimates, each finger of the RAKE receiver is modified according to the invention.

[0033] Such as figure 1 As shown, four time slots 1, 2, 3, 4 are shown applied to one of the narrowband modulated signals of the RAKE receiver fingers. Time increases from left to right, and slot 3 is designated as the "current slot" for which channel estimation will be pe...

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Abstract

A channel estimation method suitable for use in a CDMA communication system adopts a high-order interpolation method using four interpolation points per time slot. Four FIR interpolation filters (18-21) produce channel estimates for each quarter of a slot by weighting the sum pilots of the four slots with values ​​related to precomputed polynomial coefficients. The invention has shown the advantages of good performance for high speed mobile stations and low computational complexity.

Description

technical field [0001] The present invention relates to radio receivers, particularly, but not exclusively, to radio receivers for Code Division Multiple Access (CDMA) cellular communication systems. Background technique [0002] In a cellular communication system, a plurality of base stations provide wireless telecommunication service to a plurality of remote subscriber units, commonly referred to as mobile stations. Each base station defines a specific geographic area or cell in the vicinity of the base station to create a coverage area. [0003] Multiple access techniques allow simultaneous transmissions from several mobile stations to and from a single base station. One type of multiple access technique is called Code Division Multiple Access (CDMA), which uses spread spectrum signaling. Individual users in a CDMA communication system use the same carrier frequency, but are distinguished by using individual spreading codes. Accordingly, multiple spreading codes are us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/02H04W24/08H04W28/06
CPCH04B1/712H04B2201/70701H04L25/0234H04B1/7097
Inventor 吉迪恩·库茨马克·格利斯阿米尔·沙斯
Owner APPLE INC
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