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WO2000072496A1 - Emetteur-recepteur video amcr a detection conjointe adaptative - Google Patents

Emetteur-recepteur video amcr a detection conjointe adaptative Download PDF

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Publication number
WO2000072496A1
WO2000072496A1 PCT/GB2000/001889 GB0001889W WO0072496A1 WO 2000072496 A1 WO2000072496 A1 WO 2000072496A1 GB 0001889 W GB0001889 W GB 0001889W WO 0072496 A1 WO0072496 A1 WO 0072496A1
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WO
WIPO (PCT)
Prior art keywords
signal
channel quality
video
channel
multimedia
Prior art date
Application number
PCT/GB2000/001889
Other languages
English (en)
Inventor
Lajos Hanzo
Peter John Cherriman
Ee-Lin Kuan
Original Assignee
University Of Southampton
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University Of Southampton filed Critical University Of Southampton
Priority to AU45987/00A priority Critical patent/AU4598700A/en
Publication of WO2000072496A1 publication Critical patent/WO2000072496A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0032—Without explicit signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes

Definitions

  • the invention relates to burst-by-burst adaptive joint-detection Code Division Multiple Access (CDMA) s based transmission of multimedia signals, such as interactive video or audio, speech etc. 7
  • CDMA Code Division Multiple Access
  • the term statically reconfigurable found in this context in the literature refers to multimedia s transceivers that cannot be near-instantaneously reconfigured.
  • the previously proposed ⁇ o statically reconfigurable video transceivers were reconfigured on a long-term basis under the base stall tion's control, invoicing for example in the central cell region - where benign channel conditions prevail i2 - a less robust, but high-throughput modulation mode, such as 4 bit symbol Quadrature Amplitude Mod- i3 ulation (16QAM), which was capable of transmitting a quadruple number of bits and hence ensured a i4 better video quality.
  • a robust, but low-throughput modulation mode such as 1 bit/symbol is Binary Phase Shift Keying (BPSK) can be employed near the edge of the propagation ceil, where hostile i6 propagation conditions prevail.
  • BPSK Binary Phase Shift Keying
  • the fixed bitrate of the above proprietary video codecs is in contrast to existing standard video codecs, i such as the Motion Pictures Expert Group codecs known as MPEG 1 and MPEG2 or the ITU's H 263 2 codec, where the time-vanant video motion activity and the va ⁇ able-length coding techniques employed
  • the quality of the channel was determined by the short term 6 ⁇ Signal to Noise Ratio (SNR) of the received burst, which was then used as a criterion in order to choose
  • SNR Signal to Noise Ratio
  • this criterion is not an accurate measure for judging the quality of i the channel, where the existence of multi-path components produces not only power attenuation of the
  • the transceiver achieves always the best eg possible source-signal representation quality - such as video or audio quality - by automatically adjust-
  • variable-throughput adaptive schemes can be devised, which operate efficiently in conjunction ⁇ s5 with powerful error correction codecs, such as long block length turbo codes.
  • error correction codecs such as long block length turbo codes.
  • thermore when the mobile is roaming in a hostile outdoor propagation environment, typically low-order
  • ACDMA transmission parameter adaptation is an action of the transmitter in response to time-varying
  • mission parameter adaptation relies on some form of channel estimation and signalling In order to i ⁇ i efficiently react to the changes in channel quality, the following steps have to be taken
  • the receiver i9i can attempt to estimate the parameters employed at the transmitter by means of blind detection
  • the transmitter needs to communicate the transmission parameter set to i97 the receiver ( Figure 1(a)), or the receiver can attempt blind detection of the transmission parameters 198 employed ( Figure 1(c)) i99 If the channel is not reciprocal, then the channel quality estimation has to be performed at the receiver
  • the video encoder of Figure 2 is assembled into transmission packets constituting a CDMA transmission 2o ⁇ burst and the bits may be additionally mapped by the Mapper of Figure 2 to n number of different
  • SINR signal to interference plus noise ratio
  • TDMA / CDMA transceiver 2ia Access / Code Division Multiple Access (TDMA / CDMA) transceiver, which can be configured as a 1 ,
  • Bose-Chaudhu ⁇ -Hocquenghem (BCH) and turbo error correction codes were used and again, 2 i the CDMA transceiver was capable of transmitting 1, 2 and 4 bits per symbol, where each symbol was 232 spread using a low spreading factor (SF) of 16, as seen in Table 1
  • Table 2 FEC-protected and unprotected BCH and Turbo coded bitrates for the 4QAM transceiver mode
  • the transmission bitrate of the 4QAM modem mode was 29.5Kbps, which was reduced due to the approximately half-rate BCH or turbo coding, plus the associated video packet acknowledgement feedback flag error control and video packetisation overhead to produce effective video bitrates of 13.7Kbps and 1 1.1Kbps, respectively.
  • a more detailed discussion on the video packet acknowledgement feedback error control and video packetisation overhead will be provided in Section 3.4 with reference to the convolutionally coded multi-mode investigations.
  • Figure 5 portrays the bit error ratio (BER) performance of the BCH coded video transceiver using both matched filtering and joint detection for 2-8 users.
  • the bit error ratio is shown to increase, as the number of users increases, even upon employing the MMSE-BDFE multi-user detector (MUD).
  • the matched filtering receiver exhibits an unacceptably high BER for supporting perceptually unimpaired video communications
  • the MUD exhibits a far superior BER performance.
  • Figure 7 shows the video packet loss ratio (PLR) for the turbo coded video stream using matched filtering and joint detection for 2-8 users.
  • PLR video packet loss ratio
  • halt-rate constraint-length nine convolutional coding, using octal generator polynomials
  • the proposed multi-mode system can switch amongst the 1, 2 and 4 bit/symbol modulation schemes 29, under network control, based upon the prevailing channel conditions As seen in Table 3, when the
  • the modem will switch to the BPSK mode ot operation, where j4 the video bitrate drops to 5Kbps, and for maintaining a reasonable video quality, the video resolution has
  • the multi-mode system is switched to 4QAM and 00 eventually to BPSK, when the channel SNR is below 9dB, in order to maintain the required quality of 3o ⁇ service, which is dictated by the packet loss ratio
  • the figure also shows the acknowledgement feedback
  • FBER error ratio
  • the higher throughput bitrate of the 16QAM mode provides a better video quality 3io
  • the video quality of the 16QAM mode is reduced and hence 3i ⁇ it becomes beneficial to switch from the 16QAM mode to 4QAM at an SNR of about 14dB, as it was i2 suggested by the packet loss ratio performance of Figure 8
  • the video quality expressed in 3i3 terms ot PSNR is supe ⁇ or tor the 16QAM mode in compa ⁇ son to the 4QAM mode at channel SNRs 3i in excess of 12dB, however, due to the excessive PLR the perceived video quality appears infe ⁇ or in sis compa ⁇ son to that of the 4QAM mode, even though the 16QAM PSNR is higher for channel SNRs i6 in the range ot 12-14dB More specifically, we found that it was beneficial to switch to a more robust si? modulation scheme, when the PSNR was reduced by about ldB with respect to its unimpaired PSNR
  • FIG. 1 exemplifies, how a burst- 3i by-burst adaptive modem changes its modulation modes based on the fluctuating channel conditions
  • the 32 adaptive modem uses the SINR estimate at ⁇ e output of the jo t-detector to estimate the instantaneous 33 channel quality, and hence to set the modulation mode 34
  • the probability of the adaptive modem using each modulation mode for a particular channel SNRs is
  • the figure shows the smooth reduction of 45 the throughput bitrate, as the channel quality dete ⁇ orates
  • the burst-by-burst modem matches the BPSK 34 ⁇ mode's bitrate at low channel SNRs, and the 16QAM mode's bitrate at high SNRs
  • the dynamically 3 reconfigured burst-by-burst adaptive modem characte ⁇ sed in the figure perfectly estimates the prevalent 1 8 channel conditions although in practice the estimate ot channel quality is not perfect and it is inherentiv j j delayed
  • Figure 15 shows the video packet loss ratio versus channel SNR for the three fixed modulation modes
  • the adaptive modem has a far higher bitrate throughput, as the channel SNR increases.
  • the 63 burst-by-burst adaptive modem gives an error performance similar to that of the BPSK mode, but with
  • the proposed burst-by-burst adaptive transceiver can be invoked in the context 39i of arbitrary multimedia signals, irrespective of their resolution or source representation quality Spe-
  • 392 cific further embodiments of such codecs are constituted by programmable-rate speech, audio, video,
  • 393 handw ⁇ ting codecs which can be configured by the transceiver to generate a channel-quality dependent
  • V. Lau and M. Macleod "Vanable rate adaptive trellis coded QAM for high bandwidth efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

La présente invention concerne un procédé de transmission d'un signal multimédia dans un émetteur-récepteur fondé sur l'AMCR à détection conjointe quasiment instantanément adaptative utilisé pour la téléphonie vidéo sans fil. Ce procédé consiste: à utiliser un émetteur pouvant être mis en oeuvre pour émettre dans une pluralité de modes de modulation à débit et à résistance aux erreurs variables entre un mode débit maximum, résistance aux erreurs minimale et un mode débit minimal, résistance aux erreurs maximale; à obtenir une mesure de la qualité de la voie pour l'émission en cours; et à commuter sur un mode de modulation résistant plus ou moins aux erreurs chaque fois que la mesure de la qualité de la voie se détériore ou s'améliore respectivement d'une quantité définie, la qualité du signal multimédia variant ainsi régulièrement avec la qualité variable de la voie du support de transmission.
PCT/GB2000/001889 1999-05-20 2000-05-17 Emetteur-recepteur video amcr a detection conjointe adaptative WO2000072496A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45987/00A AU4598700A (en) 1999-05-20 2000-05-17 Adaptive joint-detection cdma video transceiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9911777.2A GB9911777D0 (en) 1999-05-20 1999-05-20 Transceiver
GB9911777.2 1999-05-20

Publications (1)

Publication Number Publication Date
WO2000072496A1 true WO2000072496A1 (fr) 2000-11-30

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Country Status (3)

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AU (1) AU4598700A (fr)
GB (1) GB9911777D0 (fr)
WO (1) WO2000072496A1 (fr)

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