Antenna Combining for Interference Limited MIMO Cellular Networks
Abstract
:1. Introduction
- Conventional antenna combining methods are investigated in an interference limited MIMO cellular network. In this network, it is found that the gain of the QBC method is limited because the inter-cell interference is more dominant than the intra-cell multiuser interference induced by a quantization error. Therefore, the QBC method has a lower performance than the maximum-ratio combining (MRC) method despite the small number of feedback bits.
- The QBC method is proposed for interference limited MIMO cellular networks. Conventional analysis framework described in [18,23,32] using random vector quantization (RVQ) is not applicable in interference limited MIMO cellular networks. Thus, the SCVQ model is approximated on the assumption of many feedback bits. From this approximation, it is shown that the QBC method reduces the dimension of the effective single antenna channel to where the numbers of transmit and receive antennas are and respectively. Accordingly, the ergodic spectral efficiency and the optimal number of feedback bits for the QBC method are reduced compared to that of the MRC method where the number of feedback bits increases.
- A selective antenna combining solution is proposed to overcome the reduction. The optimization problem is first introduced that enables selection of the antenna combining solution to maximize the ergodic spectral efficiency. Because the inter-cell interference is important in selecting the antenna combining, especially for cellular networks, the inter-cell interference is only averaged over beamforming vectors of other cells and the distance information in the cell interference is conserved. The required number of other cells to measure the inter-cell interference is derived from the simulation.
2. System Model
2.1. Signal Model
2.2. Quantization-Based Combining
2.3. Finite Rate Feedback Model
2.4. Performance Metric
3. Spherical-Cap Approximation of Vector Quantization-Based Analysis
4. Proposed Antenna Combining Method
4.1. Problem Formulation
4.2. Proposed Algorithm
Algorithm 1: Proposed algorithm |
1 Initialization: |
2 Obtain the channel information |
3 fordo |
4 |
5 Calculate the antenna combining |
6 Compute the effective channel |
7 Obtain the distance and , |
8 Calculate the expected SINR in [28] |
9 end |
10 |
11 Determine the antenna combining vector . |
12 Select the codebook index from the effective channel |
13 Obtain the quantized CDI and its index |
13 Feedback the quantized index to the BS. |
5. Simulation Results
6. Conclusions
Funding
Conflicts of Interest
Appendix A. Proof of Lemma 1
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Kim, T.-K. Antenna Combining for Interference Limited MIMO Cellular Networks. Sensors 2020, 20, 4210. https://doi.org/10.3390/s20154210
Kim T-K. Antenna Combining for Interference Limited MIMO Cellular Networks. Sensors. 2020; 20(15):4210. https://doi.org/10.3390/s20154210
Chicago/Turabian StyleKim, Tae-Kyoung. 2020. "Antenna Combining for Interference Limited MIMO Cellular Networks" Sensors 20, no. 15: 4210. https://doi.org/10.3390/s20154210
APA StyleKim, T.-K. (2020). Antenna Combining for Interference Limited MIMO Cellular Networks. Sensors, 20(15), 4210. https://doi.org/10.3390/s20154210