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Two-Way Coding by Beam-Forming for 802.11 WLAN

Two-Way Coding by Beam-Forming for 802.11 WLAN. Date: 20 13-05-16. Authors:. Abstract. This document is to propose a joint beam-forming and receiving design for 802.11 WLAN data exchanging service, which can effectively utilize interference as useful signal. Background (1/1).

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Two-Way Coding by Beam-Forming for 802.11 WLAN

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  1. Two-Way Codingby Beam-Forming for 802.11 WLAN Date: 2013-05-16 Authors: Zhigang Wen (BUPT)

  2. Abstract This document is to propose a joint beam-forming and receiving design for 802.11 WLAN data exchanging service, which can effectively utilize interference as useful signal. Zhigang Wen (BUPT)

  3. Background (1/1) • Device to device and wireless relaying are becoming very hot. • Data exchanging service is becoming more frequent in WLAN. • Co-channel interference strongly limits spectral efficiency. • Application Scenarios: • Packets exchanging in multi-hop relay. • Peer to peer file sharing in WLAN. • Communications among smart electrical equipment. 1 2 3 Zhigang Wen (BUPT)

  4. Two-Way Coding (TWC) By Beam-Forming (1/3) • Two-Phase Procedure: • First slot: two nodes send their own packets to the relay on the same channel resource simultaneously and thus a collided signal interpreted as a function of the two packets, e.g. xor or other linear/nonlinear combinations, is obtained at the AP side. • Second slot: the AP broadcasts the combination and each node is able to detect the other's information using its own packet. Data streams from two-way communication terminals should be aligned to the same direction, while other streams will be adjusted to orthogonal direction for space diversion multiplexing. From 4 slots to 2 slots for data exchanging. Improve by up to 100% efficiency! Key point: beam-forming and receiving design. Zhigang Wen (BUPT)

  5. Two-Way Coding (TWC)By Beam-Forming (2/3) • Changes to 802.11 WLAN PHY • Beam-forming at STAs and two-way coding at AP. • A Simple System Model. Zhigang Wen (BUPT)

  6. Two-Way Coding (TWC)By Beam-Forming (3/3) • Changes to 802.11 WLAN MAC • Create virtual and actual packet queues and several flags. • STAs sense the opportunities for two-way coding from the queue. Update the wait-for-TWC flag. • If wait-for-TWC flag is true, determine whether to use two-way coding. • If the system decides to use TWC, the immediate node schedules to make source nodes transform data simultaneously using two-way beam-forming. • The scheme can effectively solve the packet collision problem and makes very small changes to the current 802.11 standard. Zhigang Wen (BUPT)

  7. Numerical Examples (1/1) • Channel: 100 random channels with Rayleigh fading. • Monte-Carlo: for each channel, 10000 transmissions are done with uncorrelated symbols and noise. • Noise: AWGN. • Path loss: relative distance d=D/R. • Modulation: BPSK. • Channel Coding: N/A. • OFDM: N/A. • Channel Estimation: perfect. • Time-Slot: uplink phase. • NR=4, NT = 2. SIMULATION ASSUMPTIONS Zhigang Wen (BUPT)

  8. Conclusion (1/1) • This presentation propose a two-way coding joint design of pre-coder and decoder for 802.11 WLAN. It can improve the network flexibility and channel efficiency for WLAN. • Proposal 1: Two-way coding technology should be considered for exchanging services. • Proposal 2: WLAN PHY and MAC protocol changes are not great and should be made to opportunistically use the TWC. Zhigang Wen (BUPT)

  9. Thank You! Zhigang Wen (BUPT)

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