Opportunistic Secondary Communications Downlink Using Multi-Antenna Femtocell Gateways

Kenney, Brent A.; Majid, Arslan J.; Moradi, Hussein; Farhang‐Boroujeny, Behrouz

doi:10.1109/wimob52687.2021.9606400

“…Hence, for low-order modulation formats (e.g., QPSK or 16-QAM) with standard forward error correction, non-cooperative interference avoidance would produce sufficient output 𝐸 𝑠 /𝑁 0 . Non-cooperative mode is the primary operating mode for secondary network operation described in [13].…”

Section: B DL Simulation Datamentioning

confidence: 99%

“…This work is directly applicable to the operation of a secondary MSP network using the same frequency resources as a primary OFDM-based network (see [13]). R…”

Section: B DL Simulation Datamentioning

confidence: 99%

Interference Mitigation for Multi-Stream Processing with Massive MIMO

Kenney¹,

Majid²,

Moradi³

et al. 2022

Preprint

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Cyclic prefixed single carrier modulation (CP-SCM) takes the same symbol structure as the orthogonal frequency division multiplexing (OFDM). Accordingly, CP-SCM can be efficiently processed in the frequency domain for compensating channel effects and eliminating inter-symbol interference. Multi-stream processing (MSP) has recently been introduced as a resource allocation solution for CP-SCM. MSP can be implemented with a relatively small number of physical antennas while still operating in the massive MIMO regime due to the creation of virtual antennas. This paper explores another benefit of MSP: Interference Mitigation. MSP can operate in the same time domain duplexed band as interfering signals by rejecting interference at the receiver alone or coordinating with the transmitter to avoid interfered portions of the spectrum. We provide details on multiple interference mitigation techniques along with analysis and simulation results.

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“…A specific case of in-band interference is found in a spectrum-sharing secondary network, where OFDM is the primary waveform and MSP is the secondary waveform. This scenario is introduced in [13], where the secondary network is organized into femtocells, each centered around a femtocell gateway (FGW) that services several femtocell terminals (FTs). The secondary network transmits in the opposite direction as the primary network (i.e., DL during UL intervals).…”

Section: Interference Signalmentioning

confidence: 99%

“…When referring to a specific value from the set, we use 𝛼 𝑙 . We also express the per-bin channel model from (13) as…”

Section: A Ul Detection Without Cooperationmentioning

confidence: 99%

Interference Mitigation for Multi-Stream Processing with Massive MIMO

Kenney¹,

Majid²,

Moradi³

et al. 2022

Preprint

Self Cite

0

View full text Add to dashboard Cite

Cyclic prefixed single carrier modulation (CP-SCM) takes the same symbol structure as the orthogonal frequency division multiplexing (OFDM). Accordingly, CP-SCM can be efficiently processed in the frequency domain for compensating channel effects and eliminating inter-symbol interference. Multi-stream processing (MSP) has recently been introduced as a resource allocation solution for CP-SCM. MSP can be implemented with a relatively small number of physical antennas while still operating in the massive MIMO regime due to the creation of virtual antennas. This paper explores another benefit of MSP: Interference Mitigation. MSP can operate in the same time domain duplexed band as interfering signals by rejecting interference at the receiver alone or coordinating with the transmitter to avoid interfered portions of the spectrum. We provide details on multiple interference mitigation techniques along with analysis and simulation results.

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“…As an example of CP-SCM in an mMTC scenario, CP-DSSS was used in [20] as the waveform for a low-power secondary network that operates using the same frequency resources as the OFDM-based primary network. In this scenario, the secondary network is divided into several femtocells to keep the transmit power low for the secondary network users.…”

mentioning

confidence: 99%

Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

Kenney¹,

Majid²,

Moradi³

et al. 2022

Preprint

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0

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Today's Massive MIMO cellular operation is dominated by orthogonal frequency division multiplexing (OFDM) modulation. One of the advantages of OFDM is the flexibility to carve up the available spectrum into resource blocks (RBs) that can operate adjacent to one another. Massive MIMO adds spatial multiplexing layers on top of the RBs, enabling the simultaneous operation of dozens of UEs. Cyclic prefixed single carrier modulation (CP-SCM) is an alternative to OFDM that also benefits from massive MIMO and is useful as an OFDM alternative in specific scenarios. However, until recently, no resource allocation method has been proposed for CP-SCM. In this paper, we present a CP-SCM resource allocation scheme using virtual antennas in a massive MIMO time domain duplexed scenario. By creating several virtual antennas for each physical antenna, the benefits of massive MIMO are achieved with a smaller physical antenna count. Resources are quantized into data streams, and each user can be assigned a variable number of simultaneous streams. This paper presents a detailed development and analysis of multi-stream processing (MSP) for both uplink detection and downlink precoding. We also introduce heterogeneous MSP, where CP-SCM and OFDM signals can be processed in the same MSP framework.

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Opportunistic Secondary Communications Downlink Using Multi-Antenna Femtocell Gateways

Cited by 5 publications

References 8 publications

Interference Mitigation for Multi-Stream Processing with Massive MIMO

Interference Mitigation for Multi-Stream Processing with Massive MIMO

Interference Mitigation for Multi-Stream Processing with Massive MIMO

Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

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