Wireless receiver

A receiving device, radio technology, applied in the direction of selection device, radio/induction link selection arrangement, electrical components, etc., can solve the problem of unable to maintain demodulation signal at high level, unable to compensate DSCH signal fading deviation with high accuracy, etc.

Inactive Publication Date: 2004-04-21
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since the base station transmits the DSCH signal using a higher-rate modulation system than the DPCH signal, when the mobile station performs channel estimation and delay profile generation with low precision, fading deviation of the DSCH signal cannot be compensated with high precision, and Cannot maintain demodulated signal quality at high level

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Here, it will be explained in figure 1 In the mobile communication system of , a mobile station apparatus equipped with a radio receiving apparatus according to the following embodiments is based on figure 2 The channel allocation shown is an example of a case where wireless communication with a base station device is performed.

[0024] Fig. 3 is a block diagram showing a mobile station apparatus equipped with a radio receiving apparatus according to Embodiment 1 of the present invention. In FIG. 3, the DPCH despreading section 102 extracts the DPCH by despreading the signal (received signal) received through the antenna 101 at the despreading timing from the delay profile combining section 115 using the spreading code assigned to the mobile station apparatus. signal, the delay profile combining section 115 will be described later.

[0025] The PL region extracting part 103 extracts the known signal ( figure 2 "PL" in ). The data area extraction part 104 extracts...

Embodiment 2

[0057] This embodiment will illustrate an example in which among the received DSCH signals in embodiment 1, only signals exceeding a predetermined threshold are used for channel estimation and generation of delay distribution.

[0058] Embodiment 1 above uses all received DSCH signals for channel estimation and delay profile generation. However, the received DSCH signal includes a signal with reduced power due to the effect of fading. Such a DSCH signal with reduced received power easily includes errors. Performing channel estimation and delay profile generation using such DSCH signals will reduce the accuracy of the extracted demodulated signal.

[0059] Therefore, in this embodiment, only the received DSCH signals exceeding the predetermined threshold are used for channel estimation and delay distribution generation. A radio receiving apparatus according to this embodiment will be described with reference to FIG. 4 .

[0060] 4 is a block diagram showing the configuration...

Embodiment 3

[0065] This embodiment will explain that in the received DSCH signal of Embodiment 1, only DSCH signals based on a modulation system with a small multi-value number of modulation and having received power exceeding a predetermined threshold are used for Channel estimation and delay profile generation.

[0066] Generally, the base station apparatus utilizes the QPSK system (refer to Figure 6A ), 16 QAM system (reference Figure 6B ), 64 QAM system (reference Figure 6C ) to send high-speed data as a DSCH signal. Unless the amplitude information is accurately detected, in the case of receiving DSCH signals having the same average received power, the mobile station apparatus cannot make a correct provisional decision on the DSCH signals using the 16 QAM system and the 64 QAM system, although if only accurately By detecting the phase information, the mobile station apparatus can make an accurate provisional decision on the DSCH signal using the QPSK system.

[0067] Therefore...

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Abstract

An accurate access channel receiver estimating of delay profile generating estimating and delay profile detecting are carried out based on not only an individual physical channel (DPCH) but a common channel signal &lpine. g &plearod;, channel down (DSCH) period.

Description

technical field [0001] The present invention relates to a radio receiving device for a radio communication system based on a CDMA (Code Division Multiple Access) system. In particular, it relates to a radio receiving apparatus for performing channel estimation and generating a delay profile. Background technique [0002] refer to figure 1 and figure 2 , illustrating digital mobile communication in a conventional CDMA-based wireless communication system. figure 1 is a schematic diagram showing an example of a digital mobile communication system. figure 2 is a schematic diagram showing an example of channel allocation in a digital mobile communication system. [0003] figure 1 The example in . Between base station 11 and each mobile station, use figure 2 The shown dedicated channel (DPCH: Dedicated Physical Channel) and downlink shared channel (DSCH) and the like transmit transmission data and control signals. [0004] DSCH is based on time division, and transmits d...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B17/00H04L25/02H04Q7/38
CPCH04B1/7113H04L25/023H04B17/0047H04B1/7117H04L25/0204H04B17/364
Inventor 三好宪一青山高久上丰树
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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