1. Wideband-AMR Validation and Testing over 3G Network Dr. Ayman Elnashar Sr. Director - Wireless Broadband & Site Sharing Ayman.elnashar@du.ae Dr. Mahmoud Sherif Director Wireless BroadbandKassem Abdulla Sr. Manger Wireless BroadbandThanks for the support of the Wireless Broadband Team

2. Background Information Bandwidth of sound signals:- Regular telephone bandwidth (Narrowband) = 200-3400 Hz- Wideband (wider bandwidth) = 50-7000 Hz Why Wideband:- Results in major subjective improvements in speech quality- Compared to narrowband telephone speech, the low-frequency enhancementfrom 50 to 200 Hz contributes to increased naturalness, presence, and comfort.- The high-frequency extension from 3400 to 7000 Hz provides better fricativedifferentiation and therefore higher intelligibility.- A bandwidth of 50 to 7000 Hz not only improves the intelligibility andnaturalness of speech, but also adds a feeling of transparent communicationand facilitates speaker recognition. Source VoiceAge WHITE PAPER 2 3. Wideband-AMR Technical Specification: 3GPP TS 26.171 V7.0.0 (2006-09) The AMR-WB speech coder consists of the multi-rate speech coder, a source controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets. The multi-rate speech coder is a single integrated speech codec with nine source rates from 6.60 kbit/s to 23.85 kbit/s, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command. Codec mode Source codec bit-rate- AMR-WB_23.8523.85 kbit/s- AMR-WB_23.0523.05 kbit/s- AMR-WB_19.8519.85 kbit/s- AMR-WB_18.2518.25 kbit/s- AMR-WB_15.8515.85 kbit/s- AMR-WB_14.2514.25 kbit/s- AMR-WB_12.6512.65 kbit/s- AMR-WB_8.85 8.85 kbit/s- AMR-WB_6.60 6.60 kbit/s3 4. Speech Quality ComparisonSpeech quality of AMR-WB in the GSM FR channel compared to AMR-NB and EFRSource VoiceAge WHITE PAPER 4 5. Sample Handset With WB-AMR SupportSupported HandsetsVendor CurrentNokiaN8Sony EricssonElm, Hazel, CedarSamsungSIII, Galaxy Note 2AppleIPhone 5 It has to be noted that, some of existing Symbian phones likeE72 support WB-AMR but was not enabled by Nokia.Therefore, to activate WB-AMR in these phones a firmwareupgrade is needed. It is to be noted that some handset manufactures turn off theWB-AMR feature and they only enable it upon operatorrequest.5 6. 3GPP Schematic diagram for WB-AMR (TX) 6 7. Wideband Versus Narrowband: A Comparative Analysis based on live network results 7 8. Test-bed: Test SetupNode-B/RNC/MGW RX StationTX StationAudio output StreamsAudio Input StreamsWB-UE Nokia N8 WB-UE Adobe Audition RecorderNokia E72MP3 Source Files with WB frequenciesAdobe Audition Ver 3.Post Processing &Verification Tools Suit8 9. Audio Source for TestingSource Audio (Test Audio) has been very carefully chosen based on the TestVectors Associated to Rec. ITU-T G.722.2 Annex D and consists of the following: PhoneticallyPhonetically High-to-Low Low-to-High MP3 HiFi Balanced Speech Balanced SpeechFrequency Frequency Song with Background withoutScanScan(0-17KHz) Noise (Rain)Background Noise (50-7000Hz) (50-7000Hz) 9 10. Wideband versus Narrowband Real-Time Streams High Frequency Cutoff with NB High Frequency Pass with WBNarrow Band output Wide Band output 10 11. WideBand & NarrowBand-Frequency AnalysisNarrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 11 12. WB versus NB Real-Time Series:Phonetically Balanced Speech with Noise Background(Rain):Time-SeriesNB Output NB_Rain_MP3.mp3WB Output Much better Adaptive Noise Cancellation Algorithm 12 13. WB versus NB Frequency Analysis:Speech with Noise Background (Noise)Narrow-Band Cut-off Frequency : Narrower Filter Wide-Band Cut-off Frequency: Wider Filter 13 14. WB Versus NB Real-Time Series:Phonetically Balanced Speech without Background Noise, but with Female Sound.14 15. WB Versus NB Frequency Analysis:Phonetically Balanced Speech without Background Noise, but with Female Sound. Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency15 16. WB Versus NB Real Time Series: Low-to-High Frequency ScanNarrow-Band OutputWide-Band Output16 17. WB Versus NB Frequency Analysis: Low-to-High Frequency ScanNarrow-Band Cut-off FrequencyWide-Band Cut-off Frequency 17 18. WB Versus NB Real Time Series: MP3 MusicNarrow Band OutputWide-Band Output18 19. WB Versus NB Frequency Analysis: MP3 Music Narrow-Band Cut-off FrequencyWide-Band Cut-off Frequency19 20. WideBand to NarrowBand Switching during3G to 2G call Handover test-case 3G to 2G Handover 3G 2GHandover Mute < 200ms RequirementWide-Band Narrow-Band156 millisecond 20 21. WideBand (on 3G) Frequency Analysis(Before 2G Handover)21 22. NarrowBand -Frequency Analysis(After 2G Handover) 22 23. Thank You23