PAPR reduction method using bit reallocation
First Claim
1. A PAPR (peak to average power ratio) reduction method using bit reallocation, applied in a multi-carrier system, a transmitter of the multi-carrier system transmitting D-bit data at N sub-carriers over a channel, the method comprising the steps of:
- an initializing step, for initializing a bit loading algorithm to allocate di bits required at the i-th sub-carrier for data transmission, wherein 0≦
i≦
(N−
1);
a PAPR computing step, for computing the PAPR of the multi-carrier system in accordance with di bits transmitted at the i-th sub-carrier;
a comparing step, for determining if the PAPR is larger than a predetermined value A, and if yes, terminating the PAPR reduction method; and
an adjusting step, for performing an adjustment of increasing Δ
d bits at a first selected sub-carrier and decreasing Δ
d bits from a second selected sub-carrier, and then executing the PAPR computing step.
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Abstract
A PAPR reduction method using bit reallocation is disclosed, which is applied in a multi-carrier system. The lowest total transmission power P is achieved by a bit loading algorithm conditioned on the requirement of total D transmission bits per block. When the PAPR (peak to average power ratio) of the block is larger than a predetermined value A, the bit reallocation is performed to add Δd-bit transmitting data to one sub-carrier and subtract Δd-bit transmitting data from another sub-carrier, thereby continuing bit reallocation until the PAPR meets with the system requirement or an iteration number reaches a predetermined maximal number of iteration L.
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Citations
15 Claims
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1. A PAPR (peak to average power ratio) reduction method using bit reallocation, applied in a multi-carrier system, a transmitter of the multi-carrier system transmitting D-bit data at N sub-carriers over a channel, the method comprising the steps of:
-
an initializing step, for initializing a bit loading algorithm to allocate di bits required at the i-th sub-carrier for data transmission, wherein 0≦
i≦
(N−
1);a PAPR computing step, for computing the PAPR of the multi-carrier system in accordance with di bits transmitted at the i-th sub-carrier; a comparing step, for determining if the PAPR is larger than a predetermined value A, and if yes, terminating the PAPR reduction method; and an adjusting step, for performing an adjustment of increasing Δ
d bits at a first selected sub-carrier and decreasing Δ
d bits from a second selected sub-carrier, and then executing the PAPR computing step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification