Abstract
In this letter, the beam squint problem, which causes significant variations in radiated beam gain over frequencies in a millimeter wave communication system, is investigated. A constant modulus beamformer design, which is formulated to maximize the expected average beam gain within the bandwidth with limited variation over frequencies within the bandwidth, is proposed. A semidefinite relaxation method is developed to solve the optimization problem under the constant modulus constraints. Depending on the eigenvalues of the optimal solution, either direct beamforming or transmit diversity-based beamforming is employed for data transmissions. Through numerical results, the proposed transmission scheme can compensate for beam squint effectively and improve system throughput. Overall, a transmission scheme for beam squint compensation in wideband wireless communication systems is provided.
| Original language | English |
|---|---|
| Article number | 8454468 |
| Pages (from-to) | 241-244 |
| Number of pages | 4 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 8 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 2019 |
Keywords
- beam squint
- beamforming
- Millimeter wave
- space-time block coding
- throughput