GB2459284A - MIMO spatial multiplexing system - Google Patents

MIMO spatial multiplexing system Download PDF

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Publication number
GB2459284A
GB2459284A GB0806951A GB0806951A GB2459284A GB 2459284 A GB2459284 A GB 2459284A GB 0806951 A GB0806951 A GB 0806951A GB 0806951 A GB0806951 A GB 0806951A GB 2459284 A GB2459284 A GB 2459284A
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United Kingdom
Prior art keywords
data
packets
signal
data packets
original
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Withdrawn
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GB0806951A
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GB0806951D0 (en
Inventor
Stephen George Nunney
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Individual
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Individual
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Priority to GB0806951A priority Critical patent/GB2459284A/en
Publication of GB0806951D0 publication Critical patent/GB0806951D0/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N5/225—

Abstract

The invention concerns a multiple-input-multiple-output (MIMO) wireless communication system. In a preferred embodiment it is used to transmit television signals from a camera. The system includes first and second transmitting devices such as first and second antennae 5, first and second receiving devices such as first and second antennae 7, and a demultiplexer 3 for splitting a data signal into at least first and second data packets and delivering the first packet to the first transmitting device and the second packet to the second transmitting device. The first transmitting device sends the first data packet to the first receiving device, the second transmitting device sends the second data packet to the second receiving device and the original signal is reconstructed using the received packets. In one embodiment, in addition to implementing spatial multiplexing as described above, two packets containing "equivalent" data (i.e. redundant data) are simultaneously transmitted using respective transmitter device / receiver device pairs 5/7 and 13/13 and the received packets are combined by averaging, thus providing transmit diversity.

Description

Wireless Transmission of Data Signals The invention relates to apparatus and a method for the wireless transmission of data, in particular, but not exclusively to video andlor audio signals such as television signals.
The use of wireless systems for data transmission, for example for communication between networks and peripheral devices connected to the network is well known. When the bandwidth requirements are relatively low, it is possible to send data signals from a transmitter to a receiver directly, that is, without having to compress the data signal.
However, when the bandwidth requirements are relatively high it is necessary to compress the data signal prior to transmission and to decompress the signal after receipt at the receiver. While systems that use compression are quite robust there can be signal delay compression artefacts due to the loss of information and also the introduction of noise into the signal.
To address the problem of noise, it is known to transmit more than one data carrier simultaneously, which enables the recovery of the signal by averaging out the received noise. However, when the averaged data error correction method is used there is a trade off between reducing noise and data rate of that signal.
The above issues are particularly relevant to the wireless transmission of video and/or audio signals in the broadcasting industry. Analogue broadcasting camera systems have been available to the broadcasting industry for many years, for example for use in television studios. The wireless camera systems enable the operators to roam freely within a studio while still providing the required video and audio signals to other signal processing equipment for eventual broadcast. The freedom to roam is very important to provide the camera operator the maximum flexibility to frame the subject correctly.
Furthermore it obviates the need for long trailing wires, which raise health and safety issues since they present a tripping hazard.
Analogue wireless camera systems have not been entirely satisfactory due to picture quality impairments such as ghosting, noise, chroma flutter or complete loss of signal.
More recently, such camera systems have been replaced by digital equipment. These digital camera systems use data compression of the video and audio content, prior to transmitting to a receiver, which suffer from the associated problems mentioned above.
Accordingly the invention seeks to mitigate at least one of afore-mentioned problems or to at least to provide an alternative arrangement to known devices and an alternative data transmission method According to one aspect of the invention there is provided a wireless data transmission system, including first and second transmitting devices, first and second receiving devices, means for splitting a data signal into at least first and second data packets, wherein each data packet contains a portion of the original data signal, and for delivering the first data.
packet to the first transmitting device for transmission to the first receiving device and for delivering the second data packet to the second transmitting device for transmission to the second receiving device, and means for substantially reconstructing the original data signal from the data packets received by the receiving devices.
This eliminates the need for compression of data signals for wireless transmission by splitting the signal into a plurality of data packets each containing a separate part of the original signal, transmitting each packet via separate transmitter receiver pairs and then reforming the original signal from the data packets received. Thus a signal can be sent wirelessly without substantial loss of information, which can occur when compressing and decompressing signals during the encoding and decoding processes. Also, the invention significantly reduces the delay in the data signal, which is problematic in conventional devices.
Advantageously the means for splitting the data signal into at least first and second data packets splits the signal in a synchronised manner. The means for splitting the data signal into at least first and second packets can include the synchronisation data within at least one of the data packets. Preferably each data packet includes synchronisation data for reconstructing the original signal. Alternatively, or additionally, the data transfer system can include means for communicating synchronisation data to the means for substantially reconstructing the original data signal separately from the data packets.
Advantageously the wireless data transmission system can include at least one additional transmitting device and receiving device. The wireless data transmission system can include any practicable number of transmitter receiver pairs. Preferably the wireless data transmission system includes 2 to 20 pairs of transmitter devices and receiver devices, more preferably 2 to 16 pairs and more preferably still 4 to 12 pairs.
Preferably the means for splitting the data signal into at least first and second packets is arranged to split the data signal into the same number of data packets as there are transmitter receiver pairs. This ensures that each data packet within the set of data packets can be communicated by a separate transmitter receiver pair. Of course it is possible to split the signal into fewer packets than there are transmitter receiver pairs.
The means for splitting the data signal into at least first and second data packets can be arranged to split the data signal into substantially equal parts.
Advantageously the system can include a return feed from the reception side to the transmission side. This enables, for example, control data to be sent to the transmission side of the wireless data transmission system. Typically the return feed includes a transmitter receiver pair.
Advantageously the system can include means for generating a second set of data packets, wherein each data packet includes a portion of the original signal. The second set of packets can be, substantially a copy of the first set of data packets or alternatively can be dissimilar.
Advantageously the system includes means for transmitting the second set of data packets separately from the first set of data packets. For example, the system can include first and second sets of transmitter devices and first and second sets of receiver devices, wherein the means for splitting the data signal is arranged to generate first and second sets of data packets, the first set of transmitter devices is arranged to communicate the first set of data packets to the first set of receiver devices and the second set of transmitter devices is arranged to communicate the second set of data packets to the second set of receiver devices.
The means for substantially reconstructing the original data signal can be arranged to substantially reconstruct the first set of data packets to produce a first version of the original signal, and to substantially reconstruct the second set of packets to produce a second version of the original signal, and to average the first and second versions of the original signal. Alternatively the means for splitting the data signal into first and second sets of data packets can be arranged to create equivalent data packets for the first and second sets and the means for substantially reconstructing the original data signal is arranged to average corresponding packets from the first and second sets and to substantially reconstruct the original signal from the resultant averaged packets.
The averaging techniques can be used to improve the accuracy of the data transmission system.
In preferred embodiments the data transmission system is arranged to transmit video and / or audio data, and preferably to transmit television signals. The television signals are communicated on a frame by frame basis, with each frame including a number of television picture lines with or without embedded audio. The television picture frame is split into groups of lines, with each group of lines being placed into a separate data packet, wherein a complete set of data packets includes all of the television picture lines for a frame. Optionally, one or more of the data packets can include additional data such as synchronisation data for reconstructing the original signal after wireless transmission has occurred. Alternatively, the synchronisation data can be conmmnicated separately from the television picture data. The associated audio signal can be transmitted in a similar fashion if there is not sufficient bandwidth available in a single transmitter receiver pair.
According to another aspect of the invention there is provided a method of transmitting data signals wirelessly, including dividing a data signal into a set of data packets, wherein each data packet contains a portion of the original data signal, transmitting each data packet in the set via a separate transmitter receiver pair, and substantially reconstructing the original data signal from the set of data packets received by the receivers.
Advantageously the method can include splitting the data signal into at least first and second data packets synchronously.
Advantageously the method can include inserting the synchronisation data into at least one of the data packets.
Advantageously the method can include communicating the synchronisation data to the means for substantially reconstructing the original data signal separately from the data packets.
Advantageously the method can include splitting the data signal into the same number of data packets as there are transmitter receiver pairs. It is of course possible to split the signal into a smaller number of data packets than there are transmitter receiver pairs.
Advantageously the method can include using first and second sets of transmitters and first and second sets of receivers, creating first and second sets of data packets, transmitting the first set of data packets with the first set of transmitters to the first set of receivers and transmitting the second set of data packets with the second set of transmitters to the second set of receivers.
The method can include reconstructing the first set of data packets to produce a first version of the original data signal, reconstructing the second set of data packets to produce a second version of the original signal, and to average the first and second versions of the original signal. The averaging technique can be used to improve the accuracy of the data transmission system. Alternatively the method can include creating equivalent data packets for the first and second sets of data packets and averaging corresponding packets from the first and second sets received by the first and second sets of receivers and to substantially reconstruct the original signal from the resultant averaged packets.
Advantageously the original data signal includes video andlor audio data. Preferably the original data signal is a television signal.
According to another aspect of the invention there is provided a camera system including first and second transmitting devices, means for splitting a data signal into at least first and second packets wherein each packet contains a portion of the original data signal, and for delivering the first packet to the first transmitting device for transmission to a first receiving device and for delivering the second packet to the second transmitting device for transmission to a second receiving device.
According to another aspect of the invention there is provided the combination of a camera system described herein and a signal reception system including first and second receiving devices arranged to receive the first and second data packets, and means for substantially reconstructing the original data signal from the data packets received by the receiving devices.
According to another aspect of the invention there is provided a wireless data transmission system including a plurality of transmitters, means for dividing a data signal into a set of data packets, wherein each data packet in the set contains a portion of the original data signal and for delivering each data packet in the set to a separate transmitter for transmission to at least one receiver, and means for substantially reconstructing the original data signal from the data packets received by the or each receiver. The data in each of the packets is uncompressed and the data contained in the packets can be used to reconstitute the original signal.
Advantageously the system can include a plurality of transmitter receiver pairs, wherein each transmitter is arranged to transmit data packets to its associated receiver.
An embodiment invention will now be described, by way of example only, with reference to the accompanying drawings, wherein: Figure 1 is a schematic diagram of first and second embodiments of the invention.
Figure 1 shows diagrammatically a camera system including a wireless data transmission system in accordance with the invention. The camera system is of the type used in television industry, and in the example disclosed, uses a high definition (HD) picture system.
The camera system includes a high definition camera 1, an encoder 3, a set of six transmitters 5 (1 to 6), a set of six receivers 7 (a to f), a decoder 9 and a wireless return feed 11.
The camera I is of the type used for high definition television signals, for example for use in television studios or outside broadcasts and which operates with 1125 lines using an accepted video format such as Dual Link HD-SDI lO8Op format in accordance with SMPTE 372M standard, or HD-SDI 1080i format in accordance with SMPTE 292M. The encoder 3 is arranged to receive the high definition television signals from the camera I and to divide the signal into a set of data packets, which when re-combined will reproduce the original television signal. In the example shown, the encoder 3 is arranged to split the high definition television signal into six data packets. The first five packets each include lines of the 1125 line signal, with the sixth packet containing 175 lines. The encoder does this in a synchronous manner and includes synchronization data in each of the packets to ensure that the data packets are correctly re-combined after transmission. The encoder 3 is arranged to send each of the data packets to separate transmitters within the set of transmitters 7: the first packet is delivered to transmitter 1, the second packet to transmitter 2, and so on. The transmitters are conventional devices such as Netgesars RangeMaxTM NEXT WN5 1 lB Wireless N laptop adapter, the receivers are conventional, such as RangeMax Wireless-N Gigabit Router (WNR3 500). The transmitters 5 and receivers 7 are arranged in pairs such that the first transmitter 5 is arranged to send the first data packet to the first receiver 7a, the second transmitter 52 is arranged to send the second data packet to the second receiver 71,, and so on.
The signals received by the set of receivers 7 are delivered to the decoder 9. The decoder 9 uses the synchronization data within the data packets to re-combine the data packets to generate a replica of the original television signal. The synchronization data informs the decoder 9 of the order in which the packets should be re-combined to create the replica signal. Thus the created signal is substantially the same as the original signal from the camera 1. This signal can be fed to subsequent equipment, such as recording or broadcasting equipment as appropriate.
Thus the original television signal can be communicated wirelessly from the camera 1 to other equipment without the need to compress the signal. This overcomes problems of bandwidth availability without the drawbacks of compressing signals. Thus the operator of the camera 1 can have substantially the benefits of having a cable connection with the total freedom to roam.
As well as sending video data in this manner, other data can be similarly transmitted, such as audio data. The audio data can be wirelessly transmitted using a single transmitter receiver pair, or if greater bandwidth is required using plurality of transmitter receiver pairs, together with the appropriate synchronization data, as described above.
The wireless return feed 11 includes a duplex wireless transmitter device I la and duplex wireless reception device 1 lb and provides a provision for return feed to the camera 1, for example for sending control, communications data and talk back.
Optionally, the camera system can include a second set of six transmitters 13 (7 to 12) and a second set of six receivers 15 (g to I). The purpose of the second set of transmitter receiver pairs 13,15 is to provide greater accuracy. In this arrangement, the encoder 3 is arranged to send duplicate copies of the six data packets to the second set of transmitters 13 for transmission to the second set of receivers 15. The decoder 9 is arranged to reconstitute a first version of the original television signal from the data packets received from the first set of receivers 7 and a second version of the original data signal from the data packets received from second set of receivers 15, and to average the first and second versions of the original signal to obtain a more accurate recreation of the original signal for onward transmission or processing. Alternatively the encoder 3 can be arranged to generate a second set of data packets that is dissimilar to the first set.
The camera system can be used in a television studio where cameras can move about freely within the range of the receivers, thereby allowing total freedom for the operator, which would otherwise be inhibited by the use of cables. Alternatively, the camera system can be used for outside broadcasts, for example at sports events or can be used on mobile platforms such as moving vehicles on land, sea, in the air or in space whereby it is required to send data, video, audio and ancillary data to another location, which would otherwise be precluded by the use of cables.
It will be appreciated by the skilled person that modifications can be made to the above embodiment that are still within the scope of the invention, for example the concept of splitting an original signal into data packets communicating the data packets wirelessly to a decoder, which is arranged to reconstruct the original signal from the data packets received can be used in any data transmission context and in relation to any suitable data type. The data transfer system can be used in any application where cabling is a problem, for example to replace any HD-SDI link or other video link.
Thus the invention is applicable to the wireless transfer of video, audio andlor other data from computer networks to devices, such as computers, connected thereto by a wireless data transfer system as described above.
The number of transmitter receiver pairs used will always be at least two but can be of any practicable number and will be determined by the data transfer requirements. For example, in the camera system described above, if sufficient bandwidth is available for each transmitter receiver pair, the number of transmitter receiver pairs can be reduced to five transmitter receiver and the encoder 3 can be arranged to split the original high definition television signal into five data packets each having 225 lines. If less bandwidth is available, the number of transmitter receiver pairs can be increased.
The synchronization data does not need to be included in the data packets, but rather can be sent as a separate packet for example via one of the data packet transmitter receiver pairs, via a dedicated transmitter receiver pair, or some other link.

Claims (24)

  1. Claims 1. A wireless data transmission system, including first and second transmitting devices, first and second receiving devices, means for splitting a data signal into at least first and second data packets, wherein each data packet contains a portion of the original data signal, and for delivering the first data packet to the first transmitting device for transmission to the first receiving device and for delivering the second data packet to the second transmitting device for transmission to the second receiving device, and means for substantially reconstructing the original data signal from the data packets received by the receiving devices.
  2. 2. A wireless data transmission system according to claim 1, wherein the means for splitting the data signal into at least first and second data packets splits the signal in a synchronised manner.
  3. 3. A wireless data transmission system according to claim 1 or 2, wherein the means for splitting the data signal into at least first and second packets includes the synchronisation data within at least one of the data packets.
  4. 4. A wireless data transmission system according to claim 2, including means for communicating the synchronisation data to the means for substantially reconstructing the original data signal separately from the data packets.
  5. 5. A wireless data transmission system according to any one of the preceding claims, including at least one additional transmitting device arid receiving device pair.
  6. 6. A wireless data transmission system according to claim 5, including 2 to 20 pairs of transmitter devices and receiver devices, more preferably between 2 and 16 pairs and more preferably still between 4 and 12 pairs.
  7. 7. A wireless data transmission system according to claim 5 or 6, wherein the means for splitting the data signal into at least first and second packets is arranged to split the data signal into the same number of data packets as there are transmitter receiver pairs.
  8. 8. A wireless data transmission system according to any one of the preceding claims, wherein the means for splitting the data signal into at least first and second data packets is arranged to split the data signal into substantially equal parts.
  9. 9. A wireless data transmission system according to any one of the preceding claims, including a return feed from the reception side to the transmission side.
  10. 10. A wireless data transmission system according to any one of the preceding claims, including first and second sets of transmitter devices and first and second sets of receiver devices, wherein the means for splitting the data signal is arranged to generate first and second sets of data packets, the first set of transmitter devices is arranged to communicate the first set of data packets to the first set of receiver devices and the second set of transmitter devices is arranged to communicate the second set of data packets to the second set of receiver devices.
  11. 11. A wireless transmission system according to claim 10, wherein the means for substantially reconstructing the original data signal from the packets received by the receiving devices is arranged to substantially reconstruct the first set of data packets to produce a first version of the original signal, and to substantially reconstruct the second set of packets to produce a second version of the original signal, and to average the first and second versions of the original signal.
  12. 12. A wireless transmission system according to claim 10, wherein the means for splitting the data signal into first and second sets of data packets is arranged to create equivalent data packets for the first and second sets and the means for substantially reconstructing the original data signal is arranged to average corresponding packets from the first and second sets and to substantially reconstruct the original signal from the resultant averaged packets.
    -12 -
  13. 13. A wireless transmission system according to any one of the preceding claims, arranged to transmit video and / or audio data.
  14. 14. A method of transmitting data signals wirelessly, including dividing a data signal into a set of data packets, wherein each data packet contains a portion of the original data signal, transmitting each data packet in the set via a separate transmitter receiver pair, and substantially reconstructing the original data signal from the set of data packets received by the receivers.
  15. 15. A method according to claim 14, including splitting the data signal into at least first and second data packets synchronously.
  16. 16. A method according to claim 15, including inserting the synchronisation data into at least one of the data packets.
  17. 17. A method according to claim 15, including communicating the synchronisation data to the means for substantially reconstructing the original data signal separately from the data packets.
  18. 18. A method according to any one of claims 14 to 17, including splitting the data signal into the same number of data packets as there are transmitter receiver pairs.
  19. 19. A method according to any one of claims 14 to 18, including using first and second sets of transmitters and first and second sets of receivers, creating first and second sets of data packets, transmitting the first set of data packets with the first set of transmitters to the first set of receivers and transmitting the second set of data packets with the second set of transmitters to the second set of receivers.
  20. 20. A method according to claim 19, including reconstructing the first set of data packets to produce a first version of the original data signal, reconstructing the second set of data packets to produce a second version of the original signal, and to average the first and second versions of the original signal.
    -13 -
  21. 21. A method according to claim 15, including creating equivalent data packets for the first and second sets of data packets and averaging corresponding packets from the first and second sets received by the first and second sets of receivers and to substantially reconstruct the original signal from the resultant averaged packets.
  22. 22. A method according to any one of claims 14 to 21, wherein the original data signal included video and/or audio data.
  23. 23. A camera system including first and second transmitting devices, means for splitting a data signal into at least first and second packets wherein each packet contains a portion of the original data signal, means for delivering the first packet to the first transmitting device for transmission to a first receiving device and for delivering the second packet to the second transmitting device for transmission to a second receiving device.
  24. 24. The combination of a camera system according to claim 23 and a signal reception system including first and second receiving devices arranged to receive the first and second data packets, and means for substantially reconstructing the original data signal from the data packets received by the receiving devices.
GB0806951A 2008-04-17 2008-04-17 MIMO spatial multiplexing system Withdrawn GB2459284A (en)

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WO2007049208A1 (en) * 2005-10-28 2007-05-03 Koninklijke Philips Electronics N.V. Multiple antenna transmission with variable diversity gain
US20070115864A1 (en) * 2005-08-12 2007-05-24 Samsung Electronics Co., Ltd. Method and apparatus for ordering retransmissions in an NxM MIMO system
WO2008021396A2 (en) * 2006-08-17 2008-02-21 Interdigital Technology Corporation Method and apparatus for providing efficient precoding feedback in a mimo wireless communication system
US20080080371A1 (en) * 2006-09-28 2008-04-03 Chunmei Liu Macro-spatial network multiplexing

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070064586A1 (en) * 2001-10-17 2007-03-22 Nortel Networks Limited Method and system for performing cell selection for OFDM communications
US20060039275A1 (en) * 2002-10-25 2006-02-23 Walton J R Transmit diversity processing for a multi-antenna communication system
WO2005039128A1 (en) * 2003-10-15 2005-04-28 Qualcomm Incorporated Method, apparatus, and system for medium access control
WO2005104397A1 (en) * 2004-04-21 2005-11-03 Mitsubishi Denki Kabushiki Kaisha Method and system for transmitting input stream of symbols in multiple-input / multiple-output wireless communications system
US20060098760A1 (en) * 2004-11-08 2006-05-11 Samsung Electronics Co., Ltd. Method of maximizing MIMO system performance by joint optimization of diversity and spatial multiplexing
US20070115864A1 (en) * 2005-08-12 2007-05-24 Samsung Electronics Co., Ltd. Method and apparatus for ordering retransmissions in an NxM MIMO system
WO2007049208A1 (en) * 2005-10-28 2007-05-03 Koninklijke Philips Electronics N.V. Multiple antenna transmission with variable diversity gain
WO2008021396A2 (en) * 2006-08-17 2008-02-21 Interdigital Technology Corporation Method and apparatus for providing efficient precoding feedback in a mimo wireless communication system
US20080080371A1 (en) * 2006-09-28 2008-04-03 Chunmei Liu Macro-spatial network multiplexing

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