Browsing by Author "Flores Miranda, Adriana B."
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Item Distributed and scalable physical layer and medium access design for uplink multiuser multiple-input, multiple-output (MU-MIMO) in wireless local area network (WLAN) systems(2020-11-10) Flores Miranda, Adriana B.; Knightly, Edward W.; Rice University; United States Patent and Trademark OfficeA client device includes a processor and an antenna. The client device obtains an announcement that specifies a winning client of a channel contention competition; identifies a group association of the client device using an identity of the winning client; transmits a preamble modulated by an entry of a preamble interference nullification matrix, the entry is based on the group association; and transmits, after transmitting the preamble, a data transmission. The preamble is transmitted at the same time as a second preamble is transmitted by a second client device.Item Dual channel Wi-Fi for congested WLANs with asymmetric traffic loads(2017-11-14) Flores Miranda, Adriana B.; Knightly, Edward W.; Rice University; United States Patent and Trademark OfficeA method of wireless local area network communication between a client and an access point includes sending, by the client, a client-originated message to the access point over a bidirectional upload channel; receiving, by the client, a client-acknowledgement message from the access point over the bidirectional upload channel; receiving, by the client, an access point-originated message from the access point over a bidirectional download channel that was generated in response to the client-originated message; and sending, by the client, an access point-acknowledgement message to the access point over the bidirectional download channel. The bidirectional download channel is separate from the bidirectional upload channel.Item Scaling Uplink Throughput in WLANs(2016-04-21) Flores Miranda, Adriana B.; Knightly, Edward W.Form factor constraints often limit mobile clients to a single antenna, resulting in mobile devices having fewer antennas than Access Points (APs). This antenna asymmetry restricts uplink throughput to the client antenna array size rather than the AP’s. Antenna asymmetry can subsequently limit spatial multiplexing gains for transmissions between the client and AP. In this thesis, I design, implement and experimentally evaluate two standard compliant solutions that enable multiplexing gains in uplink transmissions for both single-user and multi-user paradigms. I first introduce MUSE, the first distributed and scalable system to achieve full-rank uplink multi-user capacity without control signaling for channel estimation, channel reporting, or user selection. Second, I design, implement, and experimentally evaluate Chameleon, the first system to enable uplink spatial multiplexing for a single-user with a single antenna. In Chameleon, clients spoof an unmodified AP to infer that the single-antenna client has an array and spatial multiplexing capabilities. My experiments demonstrate full-rank multiplexing gains are achieved in both single-user and multi-user paradigms. The results show performance scaling, as the system gains increase with the number spatial streams, while I still maintain standard compatibility.