53 research outputs found
What Is Commercial Speech? - the Issue Not Decided in ‘Nike v. Kasky’
A downlink two-hop MISO broadcast network is considered, with a two-antenna source communicating to 2 single-antenna destinations, via multiple single-antenna relays in between. The sum degrees of freedom (DOF) of the network with mixed channel state information at the transmitter (CSIT) is investigated. The mixed CSIT consists of accurate delayed CSIT and inaccurate instantaneous CSIT, and its availability is limited within each hop, i.e. the source is oblivious to the channels of the second hop. Given a transmission power P and a real value α in [0,1], if the variance of the error for instantaneous CSIT decreases as O(P-α), it is shown that the sum optimal DOF of the considered network is d = when there exist at least 3 intermediate relays. The result can be extended to the MIMO and multiple-hop cases. The proposed achievable schemes essentially combine the concept of retrospective interference alignment based on delayed CSIT and linear beamforming based on inaccurate instantaneous CSIT into an integrated form. Our results show that, in multi-hop MISO broadcast networks, delayed CSIT and inaccurate instantaneous CSIT can be exploited simultaneously to benefit network DOF.QC 20141114</p
Rate-Splitting and Sum-DoF for the -User MISO Broadcast Channel with Mixed CSIT and Order- Messages
In this paper, we propose a rate-splitting design and characterize the
sum-degrees-of-freedom (DoF) for the -user multiple-input-single-output
(MISO) broadcast channel with mixed channel state information at the
transmitter (CSIT) and order- messages, where mixed CSIT refers to the
delayed and imperfect-current CSIT, and order- message refers to the
message desired by users simultaneously. In particular, for the sum-DoF
lower bound, we propose a rate-splitting scheme embedding with retrospective
interference alignment. In addition, we propose a matching sum-DoF upper bound
via genie signalings and extremal inequality. Opposed to existing works for
, our results show that the sum-DoF is saturated with CSIT quality when
CSIT quality thresholds are satisfied for .Comment: This work has been accepted by VTC2023-Fal
Degrees of Freedom of Uplink-Downlink Multiantenna Cellular Networks
An uplink-downlink two-cell cellular network is studied in which the first
base station (BS) with antennas receives independent messages from its
serving users, while the second BS with antennas transmits
independent messages to its serving users. That is, the first and second
cells operate as uplink and downlink, respectively. Each user is assumed to
have a single antenna. Under this uplink-downlink setting, the sum degrees of
freedom (DoF) is completely characterized as the minimum of
,
, , and , where denotes
. The result demonstrates that, for a broad class of network
configurations, operating one of the two cells as uplink and the other cell as
downlink can strictly improve the sum DoF compared to the conventional uplink
or downlink operation, in which both cells operate as either uplink or
downlink. The DoF gain from such uplink-downlink operation is further shown to
be achievable for heterogeneous cellular networks having hotspots and with
delayed channel state information.Comment: 22 pages, 11 figures, in revision for IEEE Transactions on
Information Theor
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