Area and power efficient architectures of time deinterleaver for receivers

A method of deinterleaving interleaved data in a deinterleaver memory in an Orthogonal Frequency Division Multiplexing (OFDM) based receiver comprising a OFDM symbol counter, a divider, a first lookup table to obtain delay buffer size and interleaving lengths for a given OFDM transmission layer, and a second lookup table to obtain buffer base address and interleaving lengths for a given OFDM transmission layer, said method comprising:

• counting received OFDM symbols by incrementing said OFDM symbol counter, wherein said OFDM symbol counter comprises a bit width in the range of 23 to 33 bits;
• retrieving a delay buffer size value for a corresponding carrier from said first lookup table;
• calculating intra buffer offset by dividing said OFDM symbol counter with said delay buffer size of corresponding carrier;
• retrieving a buffer base address for corresponding carrier from said second lookup table;
• combining said intra buffer offset and said buffer base address to calculate a memory address to store corresponding carrier data bits;
• and
• storing said carrier data bits at said calculated memory address.

An Orthogonal Frequency Division Multiplexing (OFDM) based receiver that de-interleaves interleaved data, said receiver comprising:

• a deinterleaver memory;
• an OFDM symbol counter incrementing once for each orthogonal frequency division multiplexing-OFDM symbol, wherein a bit width of said OFDM symbol counter is in the range of 23 to 33 bits;
• a divider for calculating intra buffer offset in said deinterleaver memory for every increment of said OFDM symbol counter;
• a first lookup table in said deinterleaver memory for obtaining delay buffer sizes for various carriers and interleaving lengths for a given OFDM transmission layer;
• and
• a second lookup table in said deinterleaver memory for obtaining buffer base addresses for various carriers and interleaving lengths for a given OFDM transmission layer, wherein said bit width of said OFDM symbol counter is selected based on uninterrupted television viewing time on a particular channel.