Combining direct interference estimation and decoder metrics for improved measurement for AMR mode adaptation in GSM systems
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-027/06
H04L-023/00
출원번호
US-0065724
(2002-11-13)
발명자
/ 주소
Rao,Prasada
Patait,Abhijit
출원인 / 주소
Sony Ericsson Mobile Communications AB
대리인 / 주소
Moore &
인용정보
피인용 횟수 :
1인용 특허 :
3
초록▼
A method of combining a channel quality estimate for the radio channel based on direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on channel decoder metrics, to obtain a final channel quality estimate in terms of carrier-to-interference
A method of combining a channel quality estimate for the radio channel based on direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on channel decoder metrics, to obtain a final channel quality estimate in terms of carrier-to-interference (C/I) ratio for the radio channel, which is more reliable, consistent and accurate than that obtained with the individual methods. After computing a direct channel quality estimate and a decoder metric-based channel quality estimate for the radio channel, confidence levels, P(direct), P (metric), are assigned to the two estimates. P(direct) is multiplied with the direct channel quality estimate and P(metric) is multiplied with the decoder metric channel quality estimate. The respective products are added to obtain the final channel quality estimate in terms of the carrier-to-interference (C/I) ratio for the radio channel.
대표청구항▼
The invention claimed is: 1. A method of combining a channel quality estimate for a radio channel based on a direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on channel decoder metrics, to obtain a better overall estimate of the carri
The invention claimed is: 1. A method of combining a channel quality estimate for a radio channel based on a direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on channel decoder metrics, to obtain a better overall estimate of the carrier-to-interference (C/I) ratio measure of the channel quality for the radio channel, said method comprising: obtaining a direct channel quality estimate based on carrier and interferer energies; obtaining a channel decoder metric based channel quality estimate; computing a confidence level, P(direct), for the direct channel quality estimate, and a confidence level, P(metric), for the decoder metric channel quality estimate wherein, description="In-line Formulae" end="lead" 0≦P(direct)≦1, 0≦P (metric)≦1, and P(direct)+P(metric)=1;description="In-line Formulae" end="tail" multiplying P(direct) by the direct channel quality estimate and P(metric) by the decoder metric channel quality estimate; and adding the respective products to obtain a final channel quality estimate in terms of the carrier-to-interference (C/I) ratio for the radio channel. 2. The method of claim 1 further comprising: storing the previous N direct channel quality estimates; and storing the previous N decoder metric-based channel quality estimates. 3. The method of claim 2 wherein P(direct) is a function of the standard deviation σdirect of the previous N direct channel quality estimates, and the standard deviation σmetric of the previous N decoder metric-based channel quality estimates, wherein P(direct) is equal to σmetric/(σ direct+σmetric). 4. The method of claim 2 wherein P(metric) is a function of the standard deviation σdirect of the previous N direct channel quality estimates, and the standard deviation σmetric of the previous N decoder metric-based channel quality estimates, wherein P(metric) is equal to σdirect/(σ direct+σmetric). 5. The method of claim 1 wherein P(direct) is set to 0 when C/I(direct) is significantly greater than C/I(metric). 6. The method of claim 1 wherein P(metric) is set to 0 when both C/I(metric) and C/I(direct) are greater than a first threshold. 7. The method of claim 1 wherein the final channel quality estimate is used for adaptive multi-rate (AMR) codec mode adaptation. 8. A system for combining a channel quality estimate for a radio channel based on a direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on channel decoder metrics, to obtain a better overall estimate of the carrier-to-interference (C/I) ratio measure of the channel quality for the radio channel, said system comprising: means for obtaining a direct channel quality estimate based on carrier and interferer energies; means for obtaining a channel decoder metric based channel quality estimate; means for computing a confidence level, P(direct), for the direct channel quality estimate, and a confidence level, P(metric), for the decoder metric channel quality estimate wherein, description="In-line Formulae" end="lead" 0≦P(direct)≦1, 0≦P (metric)≦1, and P(direct)+P(metric)=1;description="In-line Formulae" end="tail" means for multiplying P(direct) by the direct channel quality estimate and P (metric) by the decoder metric channel quality estimate; and means for adding the respective products to obtain a final channel quality estimate in terms of the carrier-to-interference (C/I) ratio for the radio channel. 9. The system of claim 8 further comprising: means for storing the previous N direct channel quality estimates; and means for storing the previous N decoder metric-based channel quality estimates. 10. The system of claim 9 further comprising means for computing P(direct) as a function of the standard deviation σ direct of the previous N direct channel quality estimates, and the standard deviation σmetric of the previous N decoder metric-based channel quality estimates, wherein P(direct) is equal to σmetric/(σdirect+σmetric). 11. The system of claim 9 further comprising means for computing P(direct) as a function of the standard deviation σ direct of the previous N direct channel quality estimates, and the standard deviation σmetric of the previous N decoder metric-based channel quality estimates, wherein P(metric) is equal to σdirect/(σdirect+σmetric). 12. The system of claim 8 further comprising means for setting P(direct) to 0 when C/I(direct) is significantly greater than C/I (metric). 13. The system of claim 8 further comprising means for setting P(metric) to 0 when both C/I(metric) and C/I(direct) are greater than a first threshold. 14. The system of claim 8 wherein the final channel quality estimate is used for adaptive multi-rate (AMR) codec mode adaptation.
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이 특허에 인용된 특허 (3)
Meidan Reuven (Ramat Hasharon) Livneh Noam (D.N. Misgav) Silbershatz Giora (Halfa) Ritz Mordechai (Givat-Elah ILX), Method and apparatus for improving detection of data bits in a slow frequency hopping communication system.
Le Strat Evelyne,FRX ; Delprat Marc,FRX, Method of adapting the air interface in a mobile radio system and corresponding base transceiver station, mobile station and transmission mode.
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