WO2015042336A1 - Radio offrant flexibilité et degrés de liberté pour chaînes rf de transmission et de réception - Google Patents

Radio offrant flexibilité et degrés de liberté pour chaînes rf de transmission et de réception Download PDF

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Publication number
WO2015042336A1
WO2015042336A1 PCT/US2014/056440 US2014056440W WO2015042336A1 WO 2015042336 A1 WO2015042336 A1 WO 2015042336A1 US 2014056440 W US2014056440 W US 2014056440W WO 2015042336 A1 WO2015042336 A1 WO 2015042336A1
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chains
cancellation
receiver
chain
wireless radio
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PCT/US2014/056440
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Kannan Srinivasan
Bo Chen
Vivek Sriram Yenamandra GURUVENKATA
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Kannan Srinivasan
Bo Chen
Guruvenkata Vivek Sriram Yenamandra
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Publication of WO2015042336A1 publication Critical patent/WO2015042336A1/fr

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    • 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
    • H04B7/022—Site diversity; Macro-diversity

Definitions

  • Active cancellation methods create a null at the receive antenna by sending an inverted copy of the transmitted signal, either over air (Antenna cancellation) or through transmission line (Analog cancellation).
  • Antenna cancellation techniques typically require additional antennas (either for Tx, or Rx or both).
  • the antennas are arranged such that either the transmitted streams destructively interfere at the receiver, or the received streams of the signal transmitted from a transmitter combine destructively or both (referred to as two-level antenna cancellation).
  • Analog cancellation techniques utilize part of the transmit signal power to generate the cancellation signal which mimics the loss and delay of the transmitted signal through air.
  • Choi et al. use variable attenuators and variable delay elements for this purpose, while Radunovic et al. use a noise canceller chip.
  • Duarte et al. use an additional RF chain to generate the cancellation signal in RF from baseband estimates.
  • Digital cancellation is implemented by subtracting the time domain self interference channel response of the transmitted samples from the received samples. It is useful for mitigating the multipath components of self interference signals, not canceled by RF cancellation. All of these existing work only support full duplex for single input single output (SISO) systems.
  • SISO single input single output
  • a MIMO-FD system employs two-level antenna cancellation.
  • a symmetric arrangement of Tx and Rx antennas is such that the transmitted signals from a pair of TX antennas are offset by ⁇ at a given Rx as well as the received signals at a pair of Rx antennas from a given Tx antenna are offset by n.
  • MIDU requires MIDU to have 2x the number of antennas needed for a MIMO-FD node with the same number of RF chains.
  • MIDU has a fixed design. Thus, the number of RF chains that can transmit (receive) is fixed.
  • a wireless radio having a provision to choose how many RF chains it wishes to use for transmission (and the remaining for reception) in order to significantly increase network throughput.
  • a wireless radio includes a plurality of nodes, where each of the plurality of nodes adapted to dynamically provision a first number of transmitter RF chains and a second number of receiver RF chains.
  • the wireless radio also includes a cancelation circuit associated with each of the RF chains, wherein the cancellation circuit adapted to dynamically canceling noise in accordance with the first number of dynamically provisioned transmitter RF chains and the second number of dynamically provisioned receiver RF chains.
  • the wireless radio also includes a plurality of antennas that each correspond to the transmitter RF chains and the receiver RF chains.
  • a method for providing an RF-chain AnyDuplex radio system includes assigning a first location associated with a node configured as a receiver RF-chain; assigning second locations associated with nodes configured as transmit RF-chains, the second locations each being equidistant to the first location; generating a cancelation signal at each of the nodes configured as transmit RF-chains; receiving a signal with the cancelation signal at the node configured as the receiver RF-chain; and controlling an attenuator and a phase shifter at the nodes configured as transmit RF-chains to cause the cancelation signal to be an inverted replica of a signal received at node configured as the receiver RF-chain
  • Figure 1 illustrates modes of operation for an M RF-chain wireless node
  • Figures 2A-2C illustrate an example Symmetric Node Pair where Nodes 1 and 2 have equal number of RF chains
  • Figures 3A-3D illustrate an example Heterogeneous Network with different nodes having different numbers of RF chains
  • Figure 4 illustrates example antenna placement for a four RF-chain AnyDuplex system
  • Figures 5A-5B illustrate an example simplified block diagram of the RF cancellation circuit for a four RF-chain
  • Figure 6 illustrates an example implementation of extending the four RF-chain AnyDuplex system to an AnyDuplex system with higher number of RF chains;
  • Figure 7 shows an example four RF-chain AnyDuplex system;
  • Figure 8 shows an example AnyDuplex RF cancellation circuitry
  • Figures 9A-9B illustrate a Near-field Channel Response Evaluation
  • Figures 10A-10F illustrate the self-interference cancellation for 5MHz, 10MHz and 20MHz signals centered in the 2.4 GHz ISM band, respectively;
  • Figures 11A-11B illustrate an experimental setup
  • Figures 12A-12B illustrate the throughput and BER (bit error rate) comparison result for MIMO, Half-half full duplex and AnyDuplex;
  • Figure 13 plots the CDF of the measured throughput from an experiment.
  • FIG. 1 there is illustrated the supported modes of operation for an M RF-chain AnyDuplex, fixed full duplex and MIMO nodes.
  • the shaded region for each type of node encloses the modes of operation supported for that node.
  • nt, nr are the number of transmit, receive chains respectively, and are the modes of operation that utilize all M RF- chains of that node: 1 for fixed full duplex, 2 modes for MIMO, All for AnyDuplex.
  • nt and nr are the number of transmit and receive RF chains allowed by a node such that nt + nr ⁇ M.
  • MIMO can use up to M RF chains to transmit or receive.
  • a fixed full duplex system like MIDU, for a given implementation, can allow up to M/2 of its RF chains to transmit and simultaneously allow up to M/2 to receive.
  • the system of the present disclosure (herein "AnyDuplex"), can allow all possible configuration.
  • An AnyDuplex system can operate in different configurations at different times, making it completely flexbile.
  • nt/nr is defined for AnyDuplex as a mode of operation in which it commits nt of its RF-chains to transmit and the remaining nr RF-chains to receive simultaneously. Then, for an M RF-chain AnyDuplex node, the supported configurations are nt/(M - nt) for 0 ⁇ nt ⁇ M.
  • a MIMO node is simply a 0/M or M/0 configuration of AnyDuplex.
  • any fixed full duplex node is a subset of the
  • an AnyDuplex node can be configured as a MIMO or a full duplex node under network conditions where such nodes are optimal, but it also has the capability to be configured in previously unrealizable configurations to achieve optimal performance for network conditions at hand.
  • the present disclosure shows improvements by moving to a flexible RF chain (AnyDuplex) paradigm.
  • This paradigm introduces a new capability for wireless nodes and fundamentally increases the throughput a node can achieve.
  • a higher layer could dynamically choose the number of RF chains for transmission and simultaneous reception, based on network topology and flow.
  • the present disclosure further presents a fully working AnyDuplex system that has the capability to leverage the benefits of fully flexible RF resource allocation. Yet further, the present disclosure introduces a novel RF self-interference cancellation design that can dynamically adapt to cancel self-interference from multiple RF chains at multiple receive chains. This design minimizes the number of cancellation components needed. A novel digital cancellation design is also described that significantly reduces the computation complexity and subsequent resource utilization to measure the FIR filter parameters in a real-time FPGA implementation.
  • the AnyDuplex may be prototyped using an Nl PXIe-1082 platform.
  • the channel gain matrix which is [hy] , where h is the channel gain from RF chain i at the transmitter to RF chain j at the receiver.
  • nodes use all the RF chains to either transmit or receive. Since the transmitter does not know what the channel observed by the receiver is, it puts equal power on every RF chain. Assuming perfect channel estimation by the receivers and well-behaved channel matrices, the capacity of for MIMO is:
  • det is the matrix determinant
  • * is the conjugate transpose
  • SNR is the signal power to noise ratio at the receiving RF chains.
  • each node uses M/2 RF chains for transmitting and M/2 for receiving. Assumin perfect self-interference cancellation, the capacity is:
  • the capacity is equivalent to having min(M, N) parallel streams.
  • the capacity scales linearly with min(M, N).
  • the capacity is only a function of the number of receive RF chains. It linearly increases with the number of receive RF chains.
  • the AnyDuplex system of the present disclosure provides for a flexibility that can significantly improve network capacity over the state-of-the-art, inflexible systems (MIMO and full duplex).
  • MIMO state-of-the-art, inflexible systems
  • SI self-interference
  • Nodes 1 and 2 have equal number of RF chains 202, 204.
  • MIMO uses all RF chains for transmit or receive. Fixed full duplex splits RF chains equally for transmit and receive. AnyDuplex is flexible. Take, for example, a very basic topology, nodes 1 and 2 each have M RF chains; they form a symmetric node pair. Both of them want to transmit to each other. Assume the channel condition is bad first, the SNR of the transmission for both directions are low.
  • Node 1 uses M/2 RF chains 202 to transmit and M/2 RF chains to 204 receive, same as Node 2. This is shown in Figure 2B.
  • the capacity is computed between the two nodes together i.e., the sum capacity.
  • Nodes 1 and 2 can choose how many ever RF chains 202, 204 they wish, to transmit and the remaining for receive.
  • Nodes 1 and 2 use only one RF chains to transmit and (M-l) RF chain to receive, as shown in Figure 2C.
  • the capacity of AnyDuplex system is almost twice as much as the capacity of MIMO or full duplex. This is possible because in the low SNR regime, capacity is only a function of the number of receivers used. Therefore, allocating a minimum of 1 RF chain to transmit increases the overall capacity.
  • FIGS 3A-3D illustrate an example Heterogeneous Network with different nodes having different numbers of RF chains 302, 304, 306.
  • the point-to-point capacity can be almost twice as much, when the SNR is low.
  • MIMO or full duplex or the combined system will have the same capacity.
  • a combined system can increase capacity. Take a simple network of 3 nodes; node 1 has 4 RF chains 302, node 2 has 6 RF chains 304 and node 3 has 2 RF chains 306, as shown in Figure 3A.
  • the MIMO scenario is shown in Figure 3B.
  • the first term corresponds to the capacity of the link between nodes 1 and 2
  • node 1 can transmit on all 4 of its RF chains 302 and node 2 can receive on 4 RF chains 304. Simultaneously, node 2 can forward packets using the remaining 4 RF chains 304 to node 3, while node 3 uses all of its RF chains 306 for receiving.
  • Figure 3D node 2 is able to transmit (forward) while receiving because of our full duplex design.
  • the first term is for the link between nodes 1 and 2, and the second is between nodes 2 and 3. There is no scaling for these quantities because these flows happen simultaneously.
  • the flexible AnyDuplex architecture has a great potential in increasing capacity when the topology can be considered to utilize the flexibility.
  • an AnyDuplex self interference cancellation circuitry should be dynamic. Note that, for every TX RF chain, there should be a cancellation circuitry connected to every RX RF
  • AnyDuplex system has a circuitry block that matches the delay the signal over air experiences and its attenuation. This block is referred to as the delay and attenuation block.
  • the parameters (delay and attenuation) of the cancellation block is determined by the distance from the transmit antenna to the receive antenna.
  • an antenna placement scheme is provided that leverages its geometrical symmetry to alleviate the complexity of the cancellation block.
  • Figure 4 illustrates antenna placement for a four RF-chain AnyDuplex system. Three antennas are placed on the vertices of an equilateral triangle with N 4 's antenna placed on the centroid. Figure 4 illustrates the antenna placement scheme for a four RF-chain
  • AnyDuplex node Three antennas, Ni 401, N 2 402 and N 3 403 are placed on the vertices of an equilateral triangle with the fourth antenna, N 4 404, placed at the centroid.
  • an order is defined for assigning which RF-chain to transmit (receive) for a given configuration of AnyDuplex.
  • the order of transmission for a four RF-chain AnyDuplex node in descending order is: Ni, N 2 , N 3 and N 4 .
  • the RF-chain assignment for all configurations of a four-RF chain AnyDuplex system is:
  • NI, N2, N3 and N4 are all receivers (0/4)
  • NI is a transmitter and N2, N3 and N4 are receivers (1/3)
  • NI and N2 are transmitters while N3 and N4 are receivers (2/2)
  • NI, N2 and N3 are transmitters, N4 is the receiver (3/1)
  • NI, N2, N3 and N4 are all transmitters (4/0)
  • the advantage of biasing the order of transmission (reception) together with the geometry of the example antenna placement scheme is the following:
  • the attenuation and delay of the transmitted signal at a given receiver is independent of the transmitter chain.
  • the delay and attenuation block in the cancellation path of a given a receiver is decoupled from the configuration of the AnyDuplex node.
  • the attenuation and delay of the self interference signal at N 4 is the same whether originating from Ni, N 2 or N 3 .
  • the attenuation and delay of all possible self interference signals is the same at N 2 and N 3 . It must be noted that the last statement is true because of biasing the transmission order as this eliminates the possibility of an self interference signal at N 2 or N 3 to originate from N 4 .
  • Figures 5A-5B illustrate an example simplified block diagram of the RF cancellation circuit for a four RF-chain AnyDuplex system.
  • Ni, N 2 , N 3 and N 4 are the 4 antennas with associated TX/RX chains.
  • the parts numbered in Figure 5 A are 501-RF Switch, 502-Power combiner, 503-Attenuation and delay control block, 504- ⁇ Phase shifter, 505-Power Splitter.
  • Figure 5B highlights the active paths in the self interference cancellation circuitry for a 3/1 configuration.
  • the cancellation signals from TXl, TX2 and TX3 are combined, inverted (n phase shifter not shown in figure for simplicity) and fed through the delay and attenuation block associated to receiver RX4.
  • the delay and attenuation block matches the identical attenuation and delay of the self interference signals.
  • the dashed lines directed from the TX antennas to the RX antennas illustrate the link in air traversed by the self interference signals.
  • the top view of the antenna placement scheme is shown next to the block diagram.
  • Figure 5A illustrates a simplified block diagram of the self interference cancellation circuitry for a four RF-chain AnyDuplex node.
  • the notation for the antennas in Figure 5A is consistent with that in Figure 4.
  • the TX/RX RF chains are labeled TXJRX, where i is the index of the associated antenna.
  • the receiver's perspective The combiners in the paths RX2, RX3 and RX4 combine the signal received from their respective antennas with the cancellation signal.
  • RX4 is subject to self interference from Ni, N 2 and N 3 .
  • the attenuation and delay of the self interference from these three antennas at N 4 is same. This attenuation and delay is matched by the delay and attenuation block associated with N 4 .
  • the delay and attenuation block associated with N 4 is defined as the delay and attenuation block that affects the cancellation signal feeding the combiner in the path RX4. Further, the attenuation and delay of possible self interference signals are the same at N 3 and N 2 . Thus, the delay and attenuation block associated with these receivers can be combined.
  • RX1 does not need a combiner in its path since when Ni is the receiver, so are all the other RF-chains of the AnyDuplex node.
  • Delay and Attenuation Block Beneath the abstraction.
  • Each delay and attenuation block consists of a variable attenuator and a variable delay block that are controlled from the baseband.
  • the cancellation signal can be conditioned to be an inverted replica of the signal received at the corresponding receiver.
  • the switch illustrated in Figure 5A is used to connect either TX or RX path to the antenna depending on the configuration of the RF-chain.
  • Figure 5B illustrates the active cancellation paths when AnyDuplex is configured as 3/1.
  • a four RF-chain AnyDuplex system is applicable to many of the existing MIMO systems (the standard LTE system, for instance). However, AnyDuplex is not restricted to just nodes with four RF chains.
  • the de-sign of the four RF-chain AnyDuplex node can be easily extended to nodes with higher number of RF-chains. Similar to the four RF-chain design, the extended de-sign is based on the leverage of the geometrical symmetry of the extended antenna placement.
  • the reduction in the complexity of the RF cancellation is based on the following observation: Multiple transmitter antennas are equidistant to a given receiver antenna. For these transmitters, the cancellation signal can be combined before the delay and attenuation block to cancel out the self interference associated with these transmitters.
  • the antennas are Ni, N 2 , ⁇ ,Nn.
  • the transmission bias is defined as: V ti i that satisfy i ⁇ j ⁇ n, N j is the transmitter in the (Ni, N j ) transmission link.
  • AnyDuplex system with larger number of RF-chains can be designed by extending the antenna placement scheme of the four RF-chain AnyDuplex node along all sides. For an AnyDuplex system with more than four RF chains and thus, more than four antennas, additional antennas can be added to the four antenna arrangement using the following priority:
  • the above steps extend the four antenna arrangement by making copies of its geometry along all its sides. The process can be repeated on the newly created copy until all the antennas corresponding to its respective RF-chains of the node are placed.
  • Figure 6 illustrates the extension of the four RF-chain antenna placement scheme in three directions to construct the antenna placement geometry for a ten RF-chain AnyDuplex node.
  • Table 1 lists the reduction in the number of components included and thus complexity to achieve self interference cancellation for larger node AnyDuplex systems by placing the antennas using the example antenna placement scheme.
  • the reduction in the complexity of the design can be attributed to the combination of the cancellation signals of those transmitters that are equidistant to all possible receivers for that set of transmitters (the possible receivers are defined by the bias for a given set of transmitters).
  • the number of components included for an arbitrary antenna placement scheme is C(N, 2) where C means combination and N is the number of RF-chains.
  • the existing digital cancellation implementation estimates the frequency response of the self interference channel by comparing the received OFDM training symbol with the transmitted symbol.
  • This time domain response of the channel is emulated using a time domain FIR filter, which is obtained by performing an IFFT of the estimated frequency response.
  • t[n] is the training sequence sent to the FIR filter.
  • the filter coefficients a.'s are: [0077]
  • the example implementation contains just summation and a divide by p operation. By choosing p to be a power of two, the divide operation can be implemented by just shifting the bits. Thus, the methodology greatly reduces the computational complexity as well as resource utilization for the digital cancellation implementation on the FPGA.
  • Figure 7 shows an example four RF-chain AnyDuplex system.
  • implementation can be viewed as a cascade of three top-level blocks: Antenna board, RF cancellation circuitry, RF/baseband chains. They are connected using SMA cables.
  • the antennas are placed on a wooden board and held in position by wooden blocks in accordance with the placement scheme described in section 5. The distance between the antennas on the vertices and the centroid antenna is approximately 5.5".
  • the antennas are connected to antenna ports(Ni, where 1 ⁇ i ⁇ 4, in Figure 5A) of the cancellation circuitry using SMA cables.
  • FIG 8 shows an example AnyDuplex RF cancellation circuitry.
  • each RF chain contains three ports: Antenna, TX and RX port (indicated in Figure 5A).
  • the block labeled ADCB is the delay and attenuation block described above.
  • a variable phase shifter is used instead of the delay element as it was readily available.
  • the variable phase shifter is a fair substitute for a variable delay for narrowband signals. For wideband signals, it can introduce frequency dependence.
  • the affect of the phase shifter can be alleviated on wideband signals by using the delay over transmission line (a flat frequency response over wideband) as the primary method to match delays. The combined effect on cancellation for wideband signals is measured and present below.
  • the length of the cancellation path for a given Tx-Rx pair is set to match the corresponding delay of the self interference signal through air for that Tx-Rx pair.
  • the control for the switches, attenuators and phase shifters in the design come from the baseband through the control interface illustrated in Figure 8.
  • Each RF chain is composed of an XCVR 2450 (RF front end), N I-5781 (data converter module) and the Nl PXIe7965R (a Xilinx Virtex-5 FPGA) for baseband processing and digital cancellation implementation.
  • the N I-5781 contains a 14-bit ADC along with a 16-bit DAC supporting sampling rates upto 100 MSps.
  • the Virtex-5 FPGAs of an AnyDuplex node are housed in Nl-PXIe 1082 chassis which contains communication and clock backplanes to facilitate communication and synchronization among the FPGAs'.
  • Nl PXIe-8133 an RTOS-based controller, further facilitates data communication and synchronization between the FPGAs.
  • the cancellation signal at a given receiver is the combination of the cancellation signals of all self interference sources. This is valid under two assumptions:
  • the cancellation circuit components support linear mode of operation for the desired power range.
  • the power measured by the spectrum analyzer at the RX port is the combined power of the cancellation signal and the self-interference signal received by the RX antenna over air.
  • the self-interference cancellation is calculated by subtracting the power at the RX port with the receive antenna (the cancelled power) from the power without the antenna (no cancellation).
  • the power of the cancellation path is assumed to be approximately equal to the power of the SI received in the absence of cancellation. This is reasonable since when SI cancellation is high, these two powers are nearly identical.
  • a 100 KHz bandwidth signal was transmitted centered in the 2.4 GHz ISM band.
  • the self-interference cancellation at a receiver node due to either one, two or three transmitted signals is listed in Table 2. This covers the all configurations that employ self- interference cancellation for a four RF-chain AnyDuplex node.
  • the SI cancellation at a receiver node degrades in the presence of multiple transmitters due to the following reasons: 1) Mismatch in delay between the cancellation paths and the transmit paths for different RF chains.
  • the delay in the cancellation path is caused due to the finite speed of propagation of the cancellation signal through the transmission line. A slight mismatch in delay can cause degradation in cancellation.
  • by characterizing the delay for each path after accounting for parasitics and other factors specific to RF frequencies we believe the mismatch in delay and the subsequent degradation in cancellation will be minimal.
  • the experiment was performed in an indoor environment where the effect of multipath on the transmitter signal cannot be ignored.
  • Figures 10A-10F illustrate the self-interference cancellation for each of these cases.
  • Figure 10A illustrates before cancellation (5MHz);
  • Figure 10B illustrates before cancellation (10MHz);
  • Figure IOC illustrates before cancellation (20MHz);
  • Figure 10D illustrates after cancellation (5MHz);
  • Figure 10E illustrates after cancellation (10MHz);
  • Figure 10F illustrates after cancellation (20MHz).
  • the self- interference cancellation is almost flat across a 20 MHz band with an average cancellation of approximately 30dB.
  • the trough in the cancelled signal (with self-interference cancellation of approximately 34dB) is due to the delay mismatch between the transmit path and cancellation path.
  • the phase shifter used in the implementation also adds to the delay mismatch for wideband signals. However, for 5MHz and 10 MHz signals, the cancellation performance is flat across the entire band and is approximately 30dB.
  • Figure 11A shows the communication between two nodes (N i and N 2 ). Each node has four RF chains. The transmission power is set to be low, as the Tx gain is tuned from 0 to lOdB for both nodes. In this setup, our cancellation module is able to cancel out nearly all the self interference signal in the receiver RF chains. In the actual experiment, MIMO and full
  • FIG 11B shows the topology where two nodes (N i and N 3 ) contain two RF chains each while the central node (N 2 ) contains four RF chains. This experiment was conducted at 30 locations to capture different channel conditions.
  • Figures 12A-12B respectively plot the throughput and BER (bit error rate) comparison result for MIMO, Half-half full duplex and AnyDuplex. In this experimental setup, 1/3 AnyDuplex configuration maximizes the throughput. But it is shown that MIMO provides us a more stable transmission environment. As MIMO itself is also one of the configurations of AnyDuplex AnyDuplex can provide customers flexibility in choosing a more stable transmission or higher throughput.
  • BER bit error rate
  • Figure 13 plots the CDF of the measured throughput from the experiment.
  • the throughput of Half-half full duplex and MIMO systems are similar in most conditions while the throughput of AnyDuplex is around 2x the throughput of Half-Half full duplex/MIMO systems.
  • the throughput gain of AnyDuplex is less than 2x that of a MIMO system. This is due to the fact the cancellation is not perfect for a high transmission power. As different nodes are remote from each other in some cases, the power level of the received useful packets is comparable to the self-interference.
  • AnyDuplex uses ordering of RF chains, along with antenna placement, to reduce the complexity of RF cancellation.
  • This bias in assigning RF chains limits the ability to configure any given RF chain of AnyDuplex to transmit or receive. For instance, consider the basic four-node AnyDuplex system. In a 1/3 configuration, it is possible that configuring N 4 as a transmitter instead of N i could result in a better channel (higher SNR) for transmission. For high SNR channels, however, the throughput only increases
  • AnyDuplex is a fundamentally new capability for a wireless node. By choosing the number of RF chains for transmit and receive, network-wide throughput gains are possible. Current network architectures do not take the number of RF chains as an optimization variable. Future architectures should take this into account to make the best use of AnyDuplex.
  • AnyDuplex can also be used for improving reliability.
  • a future network architecture can also optimize for such metrics.

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Abstract

L'invention concerne un système et des dispositifs d'un système « tout duplex » qui permet l'allocation de ressources RF comme mesure métrique. Cette flexibilité additionnelle améliore considérablement la performance des communications sans fil. Le système fait appel à une radio sans fil possédant une pluralité de noeuds, chaque nœud de la pluralité de noeuds étant adapté à la mise en service dynamique d'un premier nombre de chaînes RF d'émission et d'un second nombre de chaînes RF de réception. Un circuit d'annulation est associé à chacune des chaînes RF, le circuit d'annulation étant adapté pour annuler de manière dynamique le bruit conformément au premier nombre de chaînes RF d'émission mises en service de manière dynamique et au second nombre de chaînes RF de réception mises en service de manière dynamique. Une pluralité d'antennes qui correspondent chacune aux chaînes RF d'émission et aux chaînes RF de réception peuvent être placées de sorte que l'atténuation et le retard du signal transmis au niveau d'un récepteur donné sont indépendants de la chaîne RF d'émission.
PCT/US2014/056440 2013-09-19 2014-09-19 Radio offrant flexibilité et degrés de liberté pour chaînes rf de transmission et de réception WO2015042336A1 (fr)

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