Efficient Precoding for Single Carrier Modulation in Multi-User Massive MIMO Networks

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

doi:10.1109/icc42927.2021.9500291

Cited by 5 publications

(26 citation statements)

References 9 publications

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“…We begin by assuming that the UE stream assignments are the same as the preceding UL intervals. In [13], we showed that the same matrix inverses calculated as part of UL detection (i.e., (B…”

Section: B Ul Simulation Resultsmentioning

confidence: 95%

“…Consequently, the UEs are responsible for performing additional processing to accommodate the reuse of the matrix inverse in the precoding equation. With this in mind, we recast the RZF precoder for MSP based on the RZF precoder from [13] as…”

Section: B Ul Simulation Resultsmentioning

confidence: 99%

“…Although we directly calculated 𝛽 RZF in [13] using numerical integration, it becomes increasingly cumbersome to perform this calculation given the larger dimensions (i.e., 𝑀 𝐿 replaces 𝑀 and 𝐾 v replaces 𝐾). It is more efficient to approximate the expected value in ( 19) through a series of random trials for each 𝐸 𝑠 /𝑁 0 value of interest.…”

Section: B Ul Simulation Resultsmentioning

confidence: 99%

“…Since the processing is being conducted on a stream-by-stream basis, the same power is required for each stream of a given UE. As a result, the difference from [13] is that 𝑝 total includes the power of all the streams. Given that there are ℓ 𝑘 streams for the 𝑘 th UE, the total transmit power is expressed as…”

Section: A DL Power Optimizationmentioning

confidence: 99%

“…Although CP-SCM has not been adopted in the 5G NR (new radio) standard, it has been shown to be a useful alternative to OFDM in a massive MIMO scenario with excellent processing gains when processed in the FD [9], [10], [11]. Explanations of detection and precoding for CP-SCM are found in [12] and [13], respectively. One reason for investigating CP-SCM is that it has been shown to possess many desirable advantages over OFDM, including low peak-toaverage-power ratio (PAPR) and robustness to carrier frequency offset [8].…”

mentioning

confidence: 99%

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Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

Kenney¹,

Majid²,

Moradi³

et al. 2022

Preprint

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<p>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.</p>

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Section: B Ul Simulation Resultsmentioning

confidence: 95%

Section: B Ul Simulation Resultsmentioning

confidence: 99%

Section: B Ul Simulation Resultsmentioning

confidence: 99%

Section: A DL Power Optimizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

Kenney¹,

Majid²,

Moradi³

et al. 2022

Preprint

Self Cite

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Frequency Domain Detection and Precoding for Massive MIMO With Single Carrier Modulation

Kenney

Majid

Moradi

et al. 2022

IEEE Trans. Wireless Commun.

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Single carrier modulation (SCM) schemes are attractive for uplink (UL) transmissions due to improved power efficiency at the user equipment (UE) transmitter compared with multi-carrier modulation schemes. In a massive MIMO scenario with SCM, the UL detection must mitigate the effects of intersymbol interference and multi-user interference. This processing is effectively performed in the frequency domain (FD) using a minimum mean squared error (MMSE) detector when the transmission is framed with a cyclic prefix. This paper analyzes an MMSE-based detector compatible with distributed processing in a time-division duplex (TDD) system. The matrix inverses computed for the UL detection are then reused to perform multiuser precoding for the downlink (DL). We find that this scheme yields tremendous savings in computational complexity compared to commonly used zero-forcing (ZF) precoding without sacrificing any performance. Since MMSE processing introduces a bias to the estimates, we derive the scalar coefficients necessary to cancel the MMSE bias. The impact of channel estimation errors is analyzed for both the UL and DL cases in conjunction with a power-efficient approach to SCM channel estimation. Moreover, extensive simulations are performed to confirm our theoretical findings.

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Opportunistic Secondary Communications Downlink Using Multi-Antenna Femtocell Gateways

Kenney

Majid

Moradi

et al. 2021

2021 17th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob)

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Efficient Precoding for Single Carrier Modulation in Multi-User Massive MIMO Networks

Cited by 5 publications

References 9 publications

Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

Single Carrier Modulation Resource Allocation for Massive MIMO with Virtual Antennas

Frequency Domain Detection and Precoding for Massive MIMO With Single Carrier Modulation

Opportunistic Secondary Communications Downlink Using Multi-Antenna Femtocell Gateways

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